Patent Application
20230258973
This application claims priority to and the benefit of Korean Patent Application No. 10-2022-0021083, filed on Feb. 17, 2022, in the Korean Intellectual Property Office, the entire contents of which are hereby incorporated by reference.
Embodiments of the present disclosure herein relate to a light control member and a display device including the same, and, for example, to a light control member including quantum dots and a display device including the same.
Display devices include a transmissive display device that selectively transmits source light generated from a light source, and a light emitting display device that generates source light from a display device itself. The display devices may include different types or kinds of light control parts according to pixels to generate color images. The light control parts may transmit only source light having a set or predetermined wavelength range or convert the color of the source light. Some light control parts may change the properties of light without converting the color of the source light.
In the display devices, quantum dot materials are used in the light control parts, and for the purpose of enhancing the display quality of the display devices, there is a need for developing technology that allows for an increase in light conversion efficiency or light transmission efficiency in the light control parts.
Embodiments of the present disclosure provide a light control member with which reflectance of external light is reduced and which has excellent light extraction efficiency.
Embodiments of the present disclosure also provide a display device including a light control member with which reflectance of external light is reduced and which has suitable or satisfactory light scattering properties, thereby achieving excellent display quality.
An embodiment of the present disclosure provides a light control member including: a light control layer including a base resin region, and a light conversion region in which a plurality of light converters are aggregated on the base resin region, wherein each of the light converters includes: a quantum dot; and a liquid crystal ligand bonded to a surface of the quantum dot.
In an embodiment, the base resin region and the light conversion region may have different refractive indices.
In an embodiment, the base resin region may include a polymer derived from at least one of an acrylate-based monomer or an epoxy-based monomer.
In an embodiment, the quantum dot may be a red quantum dot excited by blue light or green light to emit red light, or a green quantum dot excited by the blue light to emit green light.
In an embodiment, the liquid crystal ligand may be represented by Formula 1 below.
In Formula 1 above, a and b are each independently an integer of 1 to 3, n is 0 or 1, Cx and Cy are each independently a benzene ring or a cyclohexane ring, and L is a divalent ester (COO) group, a divalent ethylene group, a divalent methoxy group, a divalent acetylene group, or a divalent amine group. R is a hydrogen atom, a halogen atom, a cyano group, a hydroxy group, or a nitro group, and X and Y are each independently an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a cyano group, or a halogen atom.
In an embodiment, the liquid crystal ligand may be represented by any one selected from among LD-1 to LD-3 below, wherein in LD-1, R is the same as defined with respect to Formula 1 above.
In an embodiment, the base resin region and the light conversion region may be portions that are phase-separated in a polymerization process of a light conversion resin composition containing the monomer and the light converters dispersed in the monomer.
In an embodiment, the light control layer may have a cross-section having a fingerprint pattern formed from the arrangement of the base resin region and the light conversion region that are separated.
In an embodiment, the light control layer may include a division pattern having a plurality of openings defined therein, and first to third light control parts disposed in each of the openings, wherein the first light control part may include the base resin region and a red light conversion region, the second light control part may include the base resin region and a green light conversion region, and the third light control part may include the base resin region and a ligand region in which the liquid crystal ligands are aggregated and disposed.
In an embodiment, the base resin region may have a refractive index different from that of the red light conversion region, that of the green light conversion region, and that of the ligand region.
In an embodiment, the red light conversion region may include a plurality of red light converters, and each of the red light converters includes a red quantum dot excited by blue light or green light to emit red light and the liquid crystal ligand bonded to a surface of the red quantum dot, and the green light conversion region may include a plurality of green light converters, and each of the green light converters includes a green quantum dot excited by the blue light to emit green light and the liquid crystal ligand bonded to a surface of the green quantum dot.
In an embodiment, the first light control part may contain the red light converters in an amount of about 20 wt % to about 60 wt % with respect to 100 wt % of a total weight of the first light control part, and the second light control part may contain the green light converters in an amount of about 20 wt % to about 60 wt % with respect to 100 wt % of a total weight of the second light control part.
In an embodiment, the third light control part may contain the liquid crystal ligand in an amount of about 5 wt % to about 10 wt % with respect to 100 wt % of a total weight of the third light control part.
In an embodiment, the light control member may further include a color filter layer disposed on the light control layer and including a first filter, a second filter, and a third filter that correspond to the first light control part, the second light control part, and the third light control part, respectively.
In an embodiment of the present disclosure, a display device includes a lower panel including a display element layer in which a light emitting region is defined; and an upper panel including a light control layer disposed on the lower panel and includes a division pattern having an opening overlapping the light emitting region defined therein and a light control part disposed in the opening, wherein the light control layer includes a base resin region, and a light conversion region in which a plurality of light converters are aggregated and disposed, each of the light converters including: a quantum dot; and a liquid crystal ligand bonded to a surface of the quantum dot.
In an embodiment, the base resin region and the light conversion region may have different refractive indices.
In an embodiment, the base resin region may include a polymer derived from at least one of an acrylate-based monomer or an epoxy-based monomer.
In an embodiment, the liquid crystal ligand may be represented by Formula 1 below.
In Formula 1 above, a and b are each independently an integer of 1 to 3, n is 0 or 1, Cx and Cy are each independently a benzene ring or a cyclohexane ring, and L is a divalent ester (COO) group, a divalent ethylene group, a divalent methoxy group, a divalent acetylene group, or a divalent amine group. R is a hydrogen atom, a halogen atom, a cyano group, a hydroxy group, or a nitro group, and X and Y are each independently an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a cyano group, or a halogen atom.
In an embodiment, the light control layer may have a cross-section having a fingerprint pattern formed from the arrangement of the base resin region and the light conversion region that are separated.
In an embodiment, the light control layer may include: a first light control part including the base resin region and a red light conversion region separated from the base resin region; a second light control part including the base resin region and a green light conversion region separated from the base resin region; and a third light control part including the base resin region, and a ligand region separated from the base resin region and having the liquid crystal ligands aggregated therein.
In an embodiment, the base resin region may have a refractive index different from that of the red light conversion region, that of the green light conversion region, and that of the ligand region.
In an embodiment, the first light control part may contain a plurality of red light converters in an amount of about 20 wt % to about 60 wt % with respect to 100 wt % of a total weight of the first light control part; the second light control part may contain a plurality of green light converters in an amount of about 20 wt % to about 60 wt % with respect to 100 wt % of a total weight of the second light control part; and the third light control part may contain the liquid crystal ligand in an amount of about 5 wt % to about 10 wt % with respect to 100 wt % of a total weight of the third light control part.
In an embodiment, the display element layer may include a light emitting element that includes a first electrode, an emission layer disposed on the first electrode, and a second electrode disposed on the emission layer, and the display element layer being configured to output source light, the first light control part may include a first light converter that converts the source light into a first light, the second light control part may include a second light converter that converts the source light into a second light, and the third light control part may transmit the source light.
In an embodiment, the first light converter may include a first quantum dot excited by the source light to emit the first light, and the liquid crystal ligand bonded to a surface of the first quantum dot, and the second light converter may include a second quantum dot excited by the source light to emit the second light, and the liquid crystal ligand bonded to a surface of the second quantum dot.
In an embodiment, the upper panel may further include a filter layer disposed on an upper side of the light control layer, and including a first filter overlapping the first light control part and configured to transmit the first light, a second filter overlapping the second light control part and configured to transmit the second light, and a third filter overlapping the third light control part and configured to transmit the source light.
In an embodiment, the light control part may not include light scatterers.
The accompanying drawings are included to provide a further understanding of the subject matter of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present disclosure and, together with the description, serve to explain principles of the present disclosure. In the drawings:
The subject matter of the present disclosure may be modified in many alternate forms, and thus, example embodiments will be illustrated in the drawings and described in more detail. It should be understood, however, that it is not intended to limit the subject matter of the present disclosure to the particular forms disclosed, but rather, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure.
In the present description, when an element (or a region, a layer, a portion, etc.) is referred to as being “on,” “connected to,” or “coupled to” another element, it means that the element may be directly disposed on/connected to/coupled to the other element, or that a third element may be disposed therebetween.
In the present description, “directly disposed” may indicate that there is no layer, film, region, plate or the like added between a portion of a layer, a film, a region, a plate or the like and other portions. For example, “directly disposed” may indicate disposing without additional members such as an adhesive member between two layers or two members. Like reference numerals refer to like elements.
In addition, in the drawings, the thickness, the ratio, and the dimensions of elements may be exaggerated for an effective description of technical contents. The term “and/or” includes any and all combinations of one or more of the associated listed items.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the spirit of the present disclosure. The singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Also, terms of “below”, “on lower side”, “above”, “on upper side”, or the like may be used to describe the relationships of the components illustrated in the drawings. The terms are used as a relative concept and are described with reference to the direction indicated in the drawings. In the specification, being “disposed on” may represent not only being disposed on the top surface but also being disposed on the bottom surface.
It should be understood that the terms “comprise”, or “have” are intended to specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof in the disclosure, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure pertains. It is also to be understood that terms defined in commonly used dictionaries should be interpreted as having meanings consistent with the meanings in the context of the related art, and should not be interpreted in an idealized or overly formal sense, unless expressly so defined herein.
Hereinafter, a light control member according to an embodiment of the present disclosure and a display device including the same will be described with reference to the accompanying drawings.
A display device DD may be a device activated according to electrical signals. For example, the display device DD may be a mobile phone, a tablet, a car navigation system, a game console, and/or a wearable device, but embodiments of the present disclosure are not limited thereto.
A thickness direction of the display device DD herein may be parallel (e.g., substantially parallel) to a third directional axis DR3 which is a normal direction to a plane defined by the first directional axis DR1 and the second directional axis DR2. As described herein, a front surface (or an upper surface) and a rear surface (or a lower surface) of members constituting the display device DD may be defined with respect to the third directional axis DR3.
The display device DD according to an embodiment may include a display region DA and a non-display region NDA adjacent to the display region DA. The display region DA is a portion on which images are displayed. In the display region DA, a plurality of pixel regions PXA may be disposed. The plurality of pixel regions PXA may include first to third pixel regions PXA-R, PXA-G, and PXA-B (
In an embodiment, the display region DA may have a tetragonal shape. The non-display region NDA may surround the display region DA. However, embodiments of the present disclosure are not limited thereto, and the shape of the display region DA and the shape of the non-display region NDA may be relatively designed. In addition, the non-display region NDA may not be present on a display surface which is a front surface of the display device DD.
The display device DD according to an embodiment may include a lower panel DP having a display element layer DP-ED (
In the display device DD according to an embodiment, the filling layer FML may fill a space between the lower panel DP and the upper panel OP. The filling layer FML may serve as a buffer between the lower panel DP and the upper panel OP. In an embodiment, the filling layer FML may have a shock absorbing function, etc., and may increase the strength, resilience, and/or durability of the display device DD. The filling layer FML may be formed from a filler resin including a polymer resin. For example, the filling layer FML may be formed from a filling layer resin including an acrylic resin and/or an epoxy-based resin.
In an embodiment, the filling layer FML may be omitted, and the upper panel OP may be directly disposed on the lower panel DP. For example, in an embodiment, the filling layer FML may be omitted and the light control layer CCL (
The display device DD according to an embodiment may include an encapsulation portion SLM disposed between the lower panel DP and the upper panel OP. The encapsulation portion SLM may bond the lower panel DP with the upper panel OP. The encapsulation portion SLM is disposed in the non-display region NDA and may thus bond the lower panel DP with the upper panel OP. The encapsulation portion SLM is disposed in the non-display region NDA, which is an outer portion of the display device DD, and may thus prevent or reduce introduction of foreign substances, oxygen, and/or moisture into the display device DD from the outside. The encapsulation portion SLM may be formed from a sealant including a curable resin. The sealant may include an epoxy-based resin and/or an acrylic resin. The sealant may include a thermosetting material and/or a photocurable material. The sealant is provided on one surface of the lower panel DP or the upper panel OP, and thereafter the lower panel DP and the upper panel OP are bonded to face each other and then cured through heat and/or UV light to form the encapsulation portion SLM.
Referring to
In an embodiment, the pixel regions PXA-R, PXA-G, and PXA-B may be repeatedly disposed throughout the display region DA (
Referring to
For example, the plurality of pixel regions PXA-R, PXA-G, and PXA-B may be arranged in the form of a stripe or may be arranged in the form of a PENTILE® (e.g., an RGBG matrix, RGBG structure, or RGBG matrix structure) or a diamond. PENTILE® is a duly registered trademark of Samsung Display Co., Ltd. However, embodiments of the present disclosure are not limited thereto, and the order and arrangement of the plurality of pixel regions PXA-R, PXA-G, and PXA-B may have varied combinations according to display quality characteristics required or desired for the display device DD.
Referring to
The bank well area BWA may be a portion corresponding to an opening BW-OH defined between the division patterns BMP to prevent or reduce occurrence of defects resulting from mislanding (e.g., incorrect deposition) of ink used in the process of patterning a plurality of light control parts CCP1, CCP2, and CCP3. The mislanding portion of the ink provided for forming the light control parts CCP1, CCP2, and CCP3 (e.g., the portion of the ink that was incorrectly deposited) is disposed in the bank well area BWA, and accordingly, bonding failure caused by the mislanding of ink (e.g., incorrect deposition of ink) may be prevented or reduced. In some embodiments, a portion of an ink composition for the forming of the light control parts CCP1, CCP2, and CCP3 may be disposed on at least a portion of the bank well area BWA.
The bank well area BWA may be defined to be adjacent to the pixel regions PXA-R, PXA-G, and PXA-B. The planar shape, number, and arrangement form of the bank well areas BWA are not limited to what is shown in
Referring to
In the display device DD according to an embodiment, the lower panel DP may be a light emitting display panel. For example, the lower panel DP may be an organic electroluminescence display panel. When the lower panel DP is an organic electroluminescence display panel, the display element layer DP-ED may include an organic electroluminescence element as the light emitting element EMD. However, embodiments of the present disclosure are not limited thereto. For example, the display element layer DP-ED may include a quantum dot light emitting diode as the light emitting element EMD. In addition, the display element layer DP-ED may include a micro LED element and/or a nano LED element as the light emitting element EMD. The light emitting element EMD may generate source light. The source light generated and output from the light emitting element EMD may be provided to the upper panel OP, and the source light may be converted into light having a different wavelength in the light control layer CCL of the upper panel OP, or the source light may be scattered and transmitted.
In the lower panel DP, the base layer BS may be a member that provides a base surface on which the display element layer DP-ED is disposed. The base layer BS may be a glass substrate, a metal substrate, a polymer substrate, and/or the like. However, embodiments of the present disclosure are not limited thereto, and the base layer BS may be an inorganic layer, a functional layer, or a composite material layer.
The base layer BS may have a multilayer structure. For example, the base layer BS may have a three-layer structure of a polymer resin layer, an adhesive layer, and a polymer resin layer. In some embodiments, the polymer resin layer may include a polyimide-based resin. In addition, the polymer resin layer may include at least one of an acrylic resin, a methacrylic resin, a polyisoprene-based resin, a vinyl-based resin, an epoxy-based resin, a urethane-based resin, a cellulose-based resin, a siloxane-based resin, a polyamide-based resin, or a perylene-based resin. In the present description, a “˜˜based” resin may be considered as including a functional group of “˜˜”. For example, “a urethane-based resin” may be considered as including a urethane functional group.
The circuit layer DP-CL may be disposed on the base layer BS. The circuit layer DP-CL may include an insulating layer, a semiconductor pattern, a conductive pattern, a signal line, and/or the like. The insulating layer, the semiconductor layer, and the conductive layer are formed on the base layer BS through coating and/or deposition, and subsequently, the insulating layer, the semiconductor layer, and the conductive layer may be selectively patterned through multiple times of a photolithography process. Then, the semiconductor pattern, the conductive pattern, and the signal line included in the circuit layer DP-CL may be formed. In an embodiment, the circuit layer DP-CL may include a transistor, a buffer layer, and a plurality of insulating layers.
Referring to
The pixel defining layers PDL may be disposed on the circuit layer DP-CL and cover a portion of the first electrode EL1. Light emitting openings OH are defined in the pixel defining layers PDL. The light emitting openings OH of the pixel defining layers PDL allow at least a portion of the first electrode EU to be exposed. In the present embodiment, light emitting regions EA1, EA2, and EA3 are defined corresponding to a portion of the first electrode EL1 exposed through the light emitting openings OH.
The lower panel DP may include a first light emitting region EA1, a second light emitting region EA2, and a third light emitting region EA3. The first light emitting region EA1, the second light emitting region EA2, and the third light emitting region EA3 may be portions separated by (e.g., spaced apart by) the pixel defining layers PDL. The first light emitting region EA1, the second light emitting region EA2, and the third light emitting region EA3 may respectively correspond to the first pixel region PXA-R, the second pixel region PXA-G, and the third pixel region PXA-B. As described herein, the term “correspond” indicates that two components overlap when viewed in the thickness direction DR3 of the display device DD, and this is not limited to the same area.
The light emitting regions EA1, EA2, and EA3 may overlap the pixel regions PXA-R, PXA-G, and PXA-B and may not overlap the bank well area BWA. When viewed on a plane (e.g., when viewed in a plan view), the pixel regions PXA-R, PXA-G, and PXA-B separated by (e.g., spaced apart by) the division patterns BMP may have a greater area than the light emitting regions EA1, EA2, and EA3 separated by (e.g., spaced apart by) the pixel defining layers PDL.
In the light emitting element EMD, the first electrode EU is disposed on the circuit layer DP-CL. The first electrode EL1 may be an anode or a cathode. In addition, the first electrode EU may be a pixel electrode. The first electrode EU may be a transmissive electrode, a transflective electrode, or a reflective electrode.
The hole control layer HTR may be disposed between the first electrode EU and the emission layer EML. The hole control layer HTR may include at least one of a hole injection layer, a hole transport layer, or an electron blocking layer. The hole control layer HTR may be disposed as a common layer to overlap the light emitting regions EA1, EA2, and EA3 and the entirety of the pixel defining layers PDL that separate the light emitting regions EA1, EA2, and EA3. However, embodiments of the present disclosure are not limited thereto, and the hole control layer HTR may be provided through patterning so that the hole control layer HTR is separately disposed corresponding to each of the light emitting regions EA1, EA2, and EA3.
The emission layer EML is disposed on the hole control layer HTR. In an embodiment, the emission layer EML may be provided as a common layer to overlap the light emitting regions EA1, EA2, and EA3 and the entirety of the pixel defining layers PDL that separate the light emitting regions EA1, EA2, and EA3. In an embodiment, the emission layer EML may emit blue light. In the display device DD according to an embodiment, blue light may be source light.
The emission layer EML may overlap the entirety of the hole control layer HTR and the electron control layer ETR. However, embodiments of the present disclosure are not limited thereto, and in an embodiment, the emission layer EML may be disposed in the light emitting openings OH. In some embodiments, the emission layers EML may be separately formed to correspond to the light emitting regions EA1, EA2, and EA3 which are separated by (e.g., spaced apart by) the pixel defining layers PDL. All of the emission layers EML separately formed to correspond to the light emitting regions EA1, EA2, and EA3 may emit light in the same wavelength range or may emit light in different wavelength ranges (e.g., may emit respective lights having wavelength regions that are different from each other) in each of the light emitting regions EA1, EA2, and EA3.
The emission layer EML may have a single layer formed of a single material, a single layer formed of a plurality of different materials, or a multilayer structure having a plurality of layers formed of a plurality of different materials. The emission layer EML may include a fluorescent material and/or a phosphorescent material. In the light emitting element according to an embodiment, the emission layer EML may include an organic light emitting material, a metal organic complex, and/or quantum dots as a light emitting material.
The electron control layer ETR may be disposed between the emission layer EML and the second electrode EL2. The electron control layer ETR may include at least one of an electron injection layer, an electron transport layer, or a hole blocking layer. Referring to
The second electrode EL2 is provided on the electron control layer ETR. The second electrode EL2 may be a common electrode. The second electrode EL2 may be a cathode or an anode but embodiments of the present disclosure are not limited thereto. For example, when the first electrode EL1 is an anode, the second electrode EL2 may be a cathode, and when the first electrode EU is a cathode, the second electrode EL2 may be an anode. The second electrode EL2 may be a transmissive electrode, a transflective electrode, or a reflective electrode.
The encapsulation layer TFE may be disposed on the light emitting element EMD. For example, in an embodiment, the encapsulation layer TFE may be disposed on the second electrode EL2. In addition, when the light emitting element EMD includes a capping layer, the encapsulation layer TFE may be disposed on the capping layer. The encapsulation layer TFE may include at least one organic film and at least one inorganic film, and the inorganic film and the organic film may be alternately disposed. The encapsulation layer TFE may serve to protect the display element layer DP-ED from moisture/oxygen, and to prevent or reduce introduction of foreign substances such as dust particles into the display element layer DP-ED.
The encapsulation layer TFE may be at least one inorganic film including at least one of silicon nitride, silicon oxynitride, or silicon oxide. In addition, the inorganic film may include titanium oxide, aluminum oxide, etc.
The encapsulation layer TFE may include an organic film disposed between inorganic films. The organic film may include an organic polymer material formed from an acrylate-based resin and/or the like. However, embodiments of the present disclosure are not limited thereto.
Referring to
The light control parts CCP1, CCP2, and CCP3 included in the light control layer CCL may be spaced apart from each other. The light control parts CCP1, CCP2, and CCP3 may be disposed to be spaced apart from each other by the division pattern BMP. The light control parts CCP1, CCP2, and CCP3 may be disposed in the openings BW-OH defined in the division pattern BMP. However, embodiments of the present disclosure are not limited thereto. In
The light control parts CCP1, CCP2, and CCP3 may be portions that convert a wavelength of light provided from the display element layer DP-ED, or that transmit light without converting a wavelength of the provided light. The light control parts CCP1, CCP2, and CCP3 may be formed through an inkjet process. A liquid ink composition may be provided in the openings BW-OH, and the provided ink composition may be polymerized through a thermal curing process or a photo-curing process to form the light control parts CCP1, CCP2, and CCP3.
The light control layer CCL may include a base resin region BRA (
The light control layer CCL may further include barrier layers CAP and CAP-T disposed on at least one of an upper portion or a lower portion of the light control parts CCP1, CCP2, and CCP3. The barrier layers CAP and CAP-T may serve to prevent or reduce penetration of moisture and/or oxygen (hereinafter, referred to as moisture/oxygen). The barrier layers CAP and CAP-T may be disposed on the upper portion and the lower portion of the light control parts CCP1, CCP2, and CCP3 to prevent or reduce exposure of the light control parts CCP1, CCP2, and CCP3 to moisture/oxygen.
The barrier layers may include a first barrier layer CAP positioned adjacent to a filling layer FML, and a second barrier layer CAP-T spaced apart from the filling layer FML with the light control parts CCP1, CCP2, and CCP3 therebetween. The first barrier layer CAP may cover one surface of the light control parts CCP1, CCP2, and CCP3 positioned adjacent to the lower panel DP, and the second barrier layer CAP-T may cover the other surface of the light control parts CCP1, CCP2, and CCP3 positioned adjacent to the color filter layer CFL. In addition, the barrier layers CAP and CAP-T may cover the division pattern BMP as well as the light control parts CCP1, CCP2, and CCP3.
The first barrier layer CAP may be disposed to follow a stepped portion between the division pattern BMP and the light control parts CCP1, CCP2, and CCP3. The second barrier layer CAP-T may cover one surface of the division pattern BMP and the light control parts CCP1, CCP2, and CCP3, which are adjacent to the color filter layer CFL. The second barrier layer CAP-T may be directly disposed on a lower portion of a low refractive layer LR.
The barrier layers CAP and CAP-T may include at least one inorganic layer. In some embodiments, the barrier layers CAP and CAP-T may be formed including an inorganic material. For example, the barrier layers CAP and CAP-T may be formed including silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, or a metal thin film in which light transmittance is secured, etc. For example, the first barrier layer CAP disposed on the lower portion of the light control parts CCP1, CCP2, and CCP3 may include silicon oxynitride, and the second barrier layer CAP-T disposed on the upper portion of the light control parts CCP1, CCP2, and CCP3 may include silicon oxide. However, embodiments of the present disclosure are not limited thereto. In some embodiments, the barrier layer CAP and CAP-T may further include an organic film. The barrier layers CAP and CAP-T may be formed of a single layer or a plurality of layers.
In the display device DD of an embodiment, the upper panel OP may include the color filter layer CFL disposed on the light control layer CCL. The color filter layer CFL may include filters CF1, CF2, and CF3. In some embodiments, the color filter layer CFL may include a first filter CF1 that transmits the first color light, a second filter CF2 that transmits the second color light, and a third filter CF3 that transmits light in a wavelength range corresponding to the source light. For example, the first filter CF1 may be a red filter, the second filter CF2 may be a green filter, and the third filter CF3 may be a blue filter. The filters CF1, CF2, and CF3 may each include a polymer photosensitive resin, a pigment and/or a dye. The first filter CF1 may include a red pigment and/or a red dye, the second filter CF2 may include a green pigment and/or a green dye, and the third filter CF3 may include a blue pigment and/or a blue dye. Embodiments of the present disclosure, however, are not limited thereto, and the third filter CF3 may not include a pigment or a dye. The third filter CF3 may include a polymer photosensitive resin, but not include a pigment or a dye. In some embodiments, the third filter CF3 may be transparent. For example, the third filter CF3 may be formed of a transparent photosensitive resin.
In addition, in an embodiment, the first filter CF1 and the second filter CF2 may be yellow filters. The first filter CF1 and the second filter CF2 may not be separated (e.g., spaced apart) and may be provided as a single body. The first to third color filters CF1, CF2, and CF3 may respectively correspond to the first pixel region PXA-R, the second pixel region PXA-G, and the third pixel region PXA-B. In addition, the first to third color filters CF1, CF2, and CF3 may respectively be disposed corresponding to the first to third light control parts CCP1, CCP2, and CCP3.
In addition, the plurality of filters CF1, CF2, and CF3 that transmit different color light corresponding to the peripheral regions NPXA disposed between the pixel regions PXA-R, PXA-G, and PXA-B may be disposed to overlap each other. The plurality of filters CF1, CF2, and CF3 may be disposed overlapping each other in the third direction DR3, which is the thickness direction, to define boundaries between the adjacent light emitting regions PXA-R, PXA-G, and PXA-B. In some embodiments, unlike what is shown, the color filter layer CFL may include a light blocking unit that serves to define boundaries between the adjacent filters CF1, CF2, and CF3. The light blocking unit may be formed of a blue filter or may be formed including an organic light blocking material and/or an inorganic light blocking material, both including a black pigment and/or a black dye. The color filter layer CFL may include the low refractive layer LR. The low refractive layer LR may be disposed between the light control layer CCL and the filters CF1, CF2, and CF3. The low refractive layer LR may be disposed on the upper portion of the light control layer CCL to prevent or reduce exposure of the light control parts CCP1, CCP2, and CCP3 to moisture/oxygen. In addition, the low refractive layer LR may serve as a light functional layer disposed between the light control parts CCP1, CCP2, and CCP3 and the filters CF1, CF2, and CF3 to increase light extraction efficiency and/or prevent or reduce reflection to be incident on the light control layer CCL. The low refractive layer LR may have a smaller refractive index than a layer adjacent thereto.
The low refractive layer LR may include at least one inorganic layer. For example, the low refractive layer LR may be formed including silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, and/or a metal thin film in which light transmittance is secured, etc. However, embodiments of the present disclosure are not limited thereto, and the low refractive layer LR may include an organic layer. For example, the low refractive layer LR may be formed including a polymer resin and inorganic particles. The low refractive layer LR may be formed of a single layer or a plurality of layers.
In the display device DD according to an embodiment, the filters CF1, CF2, and CF3 of the color filter layer CFL may be directly disposed on the light control layer CCL. In this case, the low refractive layer LR may be omitted.
In an embodiment, the upper panel OP may further include a base substrate BL disposed on the color filter layer CFL. The base substrate BL may be a member providing a base surface on which the color filter layer CFL and the light control layer CCL are disposed. The base substrate BL may be a glass substrate, a metal substrate, a plastic substrate, etc. However, embodiments of the present disclosure are not limited thereto, and the base substrate BL may be an inorganic layer, an organic layer, or a composite material layer. In addition, unlike what is shown, the base substrate BL may be omitted in an embodiment.
The division pattern BMP may include a material having a transmittance of a set or predetermined value or less. For example, the division pattern BMP may include a black coloring agent to block light (or to reduce transmittance of light). The division pattern BMP may include a black dye and a black pigment mixed together with a base resin. In an embodiment, the black coloring agent may include carbon black and/or a metal such as chromium and/or an oxide thereof.
An opening BW-OH may be defined in the division pattern BMP. The opening BW-OH may correspond to the pixel regions PXA-R, PXA-G, and PXA-B or the bank well area BWA. In some embodiments, the opening BW-OH defined to correspond to the pixel regions PXA-R, PXA-G, and PXA-B may overlap a light emitting opening OH. When viewed on a plane (e.g., when viewed in a plan view), the opening BW-OH may have a larger area than the light emitting opening OH. However, embodiments of the present disclosure are not limited thereto.
Referring to
In an embodiment, the first light control part CCP1 may include a base resin region BRA and a red light conversion region R-QDA that converts the source light into the first color light, and the second light control part CCP2 may include a base resin region BRA and a green light conversion region G-QDA that converts the source light into the second color light. The source light may be generated and provided from the light emitting element EMD included in the lower panel DP (
In the light control layer CCL, the first light control part CCP1 may include a first quantum dot that converts the source light provided from the light emitting element EMD (
The base resin region BRA included in the light control parts CCP1, CCP2, and CCP3 may include a polymer derived from at least one of an acrylate-based monomer, a urethane-based monomer, or an epoxy-based monomer. The base resin region BRA may include an acrylic polymer resin, a urethane-based polymer resin, and/or an epoxy-based polymer resin.
For example, in an embodiment, the monomer may include at least one of lauryl acrylate, lauryl methacrylate, hydroxypropyl methacrylate, 3,5,5-trimethylhexyl acrylate, glycidyl methacrylate, tetrahydrofurfuryl acrylate, tetrahydrofurfuryl methacrylate, benzyl methacrylate, benzyl methacrylate), or cyclohexyl methacrylate. However, embodiments of the present disclosure are not limited thereto.
The base resin region BRA may be a portion formed through polymerization of at least one of an acrylate-based monomer, a urethane-based monomer, or an epoxy-based monomer by heat and/or UV light. The base resin region BRA may include a polymer chain PC (
Referring to
In an embodiment, the quantum dot QD may have a core-shell structure, and the core of the quantum dots may be selected from a Group II-VI compound, a Group III-VI compound, a Group compound, a Group III-V compound, a Group IV-VI compound, a Group IV element, a Group IV compound, and a combination thereof.
The Group II-VI compound may be selected from the group consisting of a binary compound selected from the group consisting of CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and a mixture thereof, a ternary compound selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, and a mixture thereof, and a quaternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and a mixture thereof.
The Group III-VI compound may include a binary compound such as In2S3 and/or In2Se3, a ternary compound such as InGaS3 and/or InGaSe3, or any combination thereof.
The Group compound may include a ternary compound selected from the group consisting of AgInS, AgInS2, CuInS, CuInS2, AgGaS2, CuGaS2 CuGaO2, AgGaO2, AgAlO2, or any mixture thereof, or a quaternary compound such as AgInGaS2 and/or CuInGaS2.
The Group III-V compound may be selected from the group consisting of a binary compound selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and a mixture thereof, a ternary compound selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb, and a mixture thereof, and a quaternary compound selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and a mixture thereof. In some embodiments, the Group III-V compound may further include a Group II metal. For example, InZnP, etc. may be selected as a Group III-II-V compound.
The Group IV-VI compound may be selected from the group consisting of a binary compound selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and a mixture thereof, a ternary compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and a mixture thereof, and a quaternary compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and a mixture thereof. The Group IV element may be selected from the group consisting of Si, Ge, and a mixture thereof. The Group IV compound may be a binary compound selected from the group consisting of SiC, SiGe, and a mixture thereof.
In this case, a binary compound, a ternary compound, or a quaternary compound may be present in particles in a uniform (e.g., substantially uniform) concentration distribution, or may be present in the same particles in a partially different concentration distribution. In addition, a core-shell structure in which one quantum dot surrounds another quantum dot may be present. The core-shell structure may have a concentration gradient in which the concentration of an element present in the shell becomes lower (decreases) along a direction towards the core.
In some embodiments, the quantum dot QD may have the core-shell structure including a core having nano-crystals, and a shell surrounding the core, which are described above. The shell of the quantum dot may serve as a protection layer to prevent or reduce the chemical deformation of the core so as to keep semiconductor properties, and/or a charging layer to impart electrophoresis properties to the quantum dot. The shell may be a single layer or multiple layers. Examples of the shell of the quantum dot may be a metal and/or non-metal oxide, a semiconductor compound, or a combination thereof.
For example, the metal and/or non-metal oxide may be a binary compound such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, and NiO, and/or a ternary compound such as MgAl2O4, CoFe2O4, NiFe2O4, and/or CoMn2O4, but embodiments of the present disclosure are not limited thereto.
In addition, the semiconductor compound may be, for example, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc., but embodiments of the present disclosure are not limited thereto.
The quantum dot QD may have a full width of half maximum (FWHM) of a light emission wavelength spectrum of about 45 nm or less, for example, about 40 nm or less, or about 30 nm or less, and color purity and/or color reproducibility may be enhanced in the above ranges. In addition, light emitted through such a quantum dot is emitted in all directions (e.g., substantially all directions), and thus a wide viewing angle may be improved.
In addition, the form of the quantum dot QD is not particularly limited and may be any suitable form generally used in the art. In some embodiments, a quantum dot in the form of spherical, pyramidal, multi-arm, and/or cubic nanoparticles, nanotubes, nanowires, nanofibers, nanoplatelets, etc. may be used.
The quantum dot QD may control the color of emitted light according to the particle size thereof, and thus the quantum dot QD may have various suitable light emission colors such as blue, red, green, etc. The smaller the particle size of the quantum dot QD becomes, light in the short wavelength region may be emitted. For example, in the quantum dot QD having the same core, the particle size of the quantum dot emitting green light may be smaller than the particle size of the quantum dot emitting red light. In addition, in the quantum dot QD having the same core, the particle size of the quantum dot emitting blue light may be smaller than the particle size of the quantum dot emitting green light. However, embodiments of the present disclosure are not limited thereto, and even in the quantum dot having the same core, the particle size may be adjusted according forming-materials and thickness of a shell.
In some embodiments, when the quantum dot QD has various light emission colors such as blue, red, green, etc., the quantum dot having different light emission colors may have different core materials.
In an embodiment, the first light control part CCP1 may include a first quantum dot excited by the source light to emit the first light, and a first light converter having a liquid crystal ligand bonded to a surface of the first quantum dot, and the second light control part CCP2 may include a second quantum dot excited by the source light to emit the second light and a second light converter having a liquid crystal ligand bonded to a surface of the second quantum dot. In some embodiments, in the red light conversion region R-QDA, the red quantum dot and light converters M-QD having the liquid crystal ligand bonded to a surface of the red quantum dot may be disposed, and in the green light conversion region G-QDA, the green quantum dot and light converters M-QD having the liquid crystal ligand bonded to a surface of the green quantum dot may be disposed.
In an embodiment, the light converters M-QD may include the liquid crystal ligand LGD bonded to a surface of the quantum dot QD. When the quantum dot QD has a core-shell structure, the liquid crystal ligand LGD may be bonded to a surface of the shell. The liquid crystal ligand LGD may have a liquid crystal molecular structure, and the liquid crystal ligand LGD may have refractive anisotropy due to characteristics of liquid crystal molecules having different lengths of a major axis and a minor axis.
Accordingly, the light converters M-QD having the liquid crystal ligand LGD may have high light scattering properties. In an embodiment, the liquid crystal ligand LGD bonded to the surface of the quantum dot QD may scatter light emitted from the quantum dot QD.
In addition, the liquid crystal ligand LGD may increase the aggregation of the light converters M-QD. The light converters M-QD having the liquid crystal ligand LGD may be closely aligned through the interaction between the liquid crystal ligands LGD, and accordingly a plurality of light converters M-QD may be aggregated to form a light conversion region QDA that is separated from (e.g., distinct from) the base resin region BRA.
Referring to
In an embodiment, the first light control part CCP1 and the second light control part CCP2 may be phase-separated into two distinct regions having different refractive indices. Boundaries defining the light conversion regions R-QDA and G-QDA may be defined by the neighboring base resin region BRA. The base resin region BRA and the light conversion regions R-QDA and G-QDA may be separated (e.g., distinct from each other) and arranged randomly. For example, the arrangement of the two regions separated into the base resin region BRA and the light conversion regions R-QDA and G-QDA may have a fingerprint pattern. The base resin region BRA and the light conversion region R-QDA and G-QDA may each be arranged randomly or may have an extended deformed lamellar structure and be arranged irregularly, and the light conversion regions R-QDA and G-QDA may form domains using the base resin region BRA as a matrix and be separated (e.g., distinct from each other).
Light incident on the first light control part CCP1 and the second light control part CCP2 may have a light path altered at a boundary between the base resin region BRA and the light conversion regions R-QDA and G-QDA that have different refractive indices. Accordingly, the light incident on the first light control part CCP1 and the second light control part CCP2 may be scattered in various suitable directions in the first light control part CCP1 and the second light control part CCP2. In an embodiment, the first light control part CCP1 and the second light control part CCP2 may be suitably or sufficiently excited by the source light scattered in various suitable directions to emit the light-converted light, thereby exhibiting high light extraction efficiency.
Referring to
Through the aggregation taken place by interaction between the liquid crystal ligands LGD (e.g., between each other), the ligand region LGA that is separated from (e.g., distinct from) the base resin region BRA may be formed in the third light control part CCP3. For example, the liquid crystal ligands LGD may be attracted to one another, thereby causing the liquid crystal ligands LGD to aggregate together and form the ligand region LGA separated from (e.g., distinct from) the base resin region BRA.
Each of the liquid crystal ligands LGD forming the ligand aggregation M-LGD may have a liquid crystal molecular structure, and may have refractive anisotropy due to characteristics of liquid crystal molecules having different lengths of a major axis and a minor axis. Accordingly, the ligand aggregation M-LGD including the liquid crystal ligands LGD may have high light scattering properties. In addition, in an embodiment, the base resin region BRA and the ligand region LGA included in the third light control part CCP3 may have different refractive indices, and accordingly, the light incident on the third light control part CCP3 may alter a light path thereof at individual ligand aggregation M-LGD or at the boundaries between the base resin region BRA and the ligand region LGA, and thus, be effectively scattered.
Referring to
Light incident on the third light control part CCP3 may have a light path altered at the boundary between the base resin region BRA and the ligand region LGA that have different refractive indices. Accordingly, the light incident on the third light control part CCP3 may be scattered in various suitable directions. In an embodiment, the third light control part CCP3 may have an increased light transmission efficiency.
In
In Formula 1 above, a and b may each independently be an integer of 1 to 3, and n may be 0 or 1. Cx and Cy may each independently be a benzene ring or a cyclohexane ring, and L is a divalent ester (COO) group, a divalent ethylene group, a divalent methoxy group, a divalent acetylene group, or a divalent amine group. In addition, R may be a hydrogen atom, a halogen atom, a cyano group, a hydroxy group, or a nitro group, and X and Y may each independently be an alkyl group having 1 to 10 carbon atoms, an alkoxy group, a cyano group, or a halogen atom.
In the liquid crystal ligand LGD represented by Formula 1, X and Y may be terminal groups, and any one of them may be a portion bonded to a surface of the quantum dot QD. The terminal group of any one of X and Y may be bonded to the surface of the quantum dot QD and the other terminal group may be adjacent to a liquid crystal ligand LGD portion of the neighboring light converter M-QD or may be adjacent to the base resin region BRA.
A portion represented by “L” in Formula 1 may be a linker. The linker may be a portion that links neighboring ring groups. In addition, in an embodiment, the linker portion may be omitted.
For example, in an embodiment, the liquid crystal ligand LGD may be represented by any one selected from among LD-1 to LG-3 below. In LD-1, R is the same as defined with respect to Formula 1.
Referring to
In addition, referring to
In an embodiment, the light control layer CCL may not include light scatterers. The first light control part CCP1 and the second light control part CCP2 may be formed of the base resin region BRA including a polymer, and the light conversion region QDA in which light converters formed of quantum dots and liquid crystal ligands are arranged, and may not include light scatterers. In addition, the third light control part CCP3 may be formed of the base resin region BRA including a polymer, and the ligand region LGA formed of liquid crystal ligands, and may not include light scatterers. In some embodiments, the light control layer CCL may be a portion that does not include light scatterers of inorganic particles such as TiO2, ZnO, Al2O3, SiO2, or hollow silica.
The light control layer CCL according to an embodiment may not include light scatterers such as inorganic particles, and thus, may prevent or reduce reflection from the light scatterers of external light incident on the light control parts CCP1, CCP2, CCP3, thereby exhibiting low external light reflectance. In some embodiments, the light control layer CCL according to an embodiment may not include light scatterers and thus exhibit low reflectance, and may include the first and second light control parts CCP1 and CCP2 having the base resin region BRA and the light conversion region QDA that are phase-separated, and a base resin region BRA and a ligand region LGA that are phase-separated, thereby exhibiting excellent light extraction efficiency together.
In addition, the light control layer CCL according to an embodiment may not include light scatterers in a resin composition used for manufacturing the light control parts CCP1, CCP2, and CCP3, and may thus prevent or reduce irregularities caused by the degree of sedimentation of light scatterers in the resin composition supplied through a nozzle. Accordingly, in the light control parts CCP1, CCP2, and CCP3 of an embodiment formed from the resin composition not including light scatterers, poor appearance due to a difference in the distribution of light scatterers may be prevented or reduced. In addition, in the resin composition not including light scatterers, clogging due to light scatterers in the nozzle that supplies the resin composition may be prevented or reduced to increase production efficiency of a light control layer.
In an embodiment, the first light control part CCP1 may contain about 20 wt % to about 60 wt % of red light converters with respect to 100 wt % of a total weight of the first light control part CCP1. The second light control part CCP2 may contain about 20 wt % to about 60 wt % of green light converters with respect to 100 wt % of a total weight of the second light control part CCP2. The red light converters and the green light converters may each include quantum dots and liquid crystal ligands bonded to the surface of the quantum dots. In an embodiment, each of the first light control part CCP1 and the second light control part CCP2 may contain light converters in a weight ratio of about 20 wt % to about 60 wt % and may thus effectively phase-separate the base resin region BRA and the light conversion regions R-QDA and G-QDA, thereby exhibiting required or suitable color reproducibility and light extraction efficiency.
In addition, in an embodiment, the third light control part CCP3 may include liquid crystal ligands in an amount of about 5 wt % to about 10 wt % with respect to 100 wt % of a total weight of the third light control part CCP3. In an embodiment, the third light control part CCP3 may include liquid crystal ligands in a weight ratio of about 5 wt % to about 10 wt %, and may thus effectively phase-separate the base resin region BRA and the ligand region LGA, thereby exhibiting excellent light extraction efficiency.
Referring to
The polymerization of the light conversion resin composition QIK may be performed using ultraviolet light (UV). However, embodiments of the present disclosure are not limited thereto, and the polymerization of the light conversion resin composition QIK may be performed using heat.
In the polymerization process of the light conversion resin composition QIK, according to the polymerization of the monomer PBR, the base resin region BRA, which is a polymer rich phase containing a polymer formed from the polymerization of a monomer, and the light conversion region QDA, which is a QD rich phase formed of aggregated light converters M-QD, may be divided and phase-separated. In some embodiments, the light conversion resin composition QIK may be phase-separated into the base resin region BRA and the light conversion region QDA through polymerization-induced phase separation (PIPS).
In some embodiments, in the third light control part CCP3 (
Widths WBRA and WQDA in one cross-section of the base resin region BRA and the light conversion region QDA constituting the fingerprint pattern of one cross-section of the light control part CCP may each be about 1 μm. For example, the widths WBRA and WQDA in one cross-section of the base resin region BRA and the light conversion region QDA may each be about 1 μm or less. When considering the degree of light scattering according to particle size in consideration of Mie scattering peak, in the case that the two regions of the base resin region BRA and the light conversion region QDA that have different refractive indices each have a width of about 1 μm or less, the degree of light scattering in the light control part CCP may be increased.
In some embodiments, as the base resin region BRA and the light conversion region QDA each are randomly formed after being induced in the process of polymerization, the widths WBRA and WQDA in one cross-section may be an average value of the widths WBRA of each of the base resin regions BRA, and an average value of the widths WQDA of each of the light conversion regions QDA, which are measured with respect to one direction (e.g., herein a direction perpendicular (e.g., substantially parallel) to the third direction DR3).
Light BLR incident on the light control part CCP according to an embodiment may be bent and advanced at the boundaries between the base resin region BRA and the light conversion region QDA. The light BLR incident in one direction may be bent and transmitted in different directions while passing through the light control part CCP, and directions SL1 and SL2 of emitted light may be varied in two or more directions. Accordingly, the light control part CCP according to an embodiment does not include light scatterers, but may exhibit excellent light scattering properties and light extraction efficiency due to altered light paths resulting from a difference in refractive index in two different regions.
Table 1 below shows the results of evaluating optical properties in light control parts of a Comparative Example and an Example. The Comparative Example and the Example were each manufactured to have a film thickness of 9 μm.
A resin composition used for manufacturing the light control part of the Comparative Example includes acrylic monomers, quantum dots, and TiO2 and a resin composition used for manufacturing the light control part of the Example includes acrylic monomers and light converters, but do not include TiO2. The light converters of the Example are ones in which liquid crystal ligands are bonded to the quantum dots used in the Comparative Example.
In Table 1, light absorptance indicates absorptance of light provided to the light control parts of the Comparative Example and the Example, and light extraction efficiency indicates the proportion of light emitted from the light control parts to the provided light. Reflectance indicates SCI reflectance in the light control parts of the Comparative Example and the Example when external light is provided. Whether or not phase separation takes place is observed using FIB-SEM images of phase separation in the light control parts after polymerization of the resin compositions.
Referring to the results of Table 1, it is seen that the Example exhibits a similar light absorptance as compared to the Comparative Example, and exhibits phase-separated characteristics. In addition, it can be seen that the light control part of the Example exhibits light extraction efficiency equal to or higher than that of the light control part of the Comparative Example, and exhibits reflectance that is reduced by 10% or greater compared to the Comparative Example. That is, based on the results of Table 1, it can be seen that the light control part of the Example including two regions not including light scatterers to be phase-separated and divided exhibits excellent light extraction efficiency and reduced reflectance compared to the light control part including existing light scatterers.
Referring to
That is, it can be seen that compared to a light control layer including an existing light control part that includes light scatterers, a light control layer according to an embodiment not including light scatterers but including phase-separated regions exhibits remarkably reduced reflection of external light in the case of having the same level of light extraction efficiency.
The light control member according to an embodiment described with reference to
The display device DD according to an embodiment described with reference to
The light control member of an embodiment includes a base resin region and a light conversion region which are separated (e.g., distinct from each other), and the light conversion region includes light converters containing quantum dots and liquid crystal ligands to exhibit suitable or satisfactory light extraction efficiency and low reflectance. In addition, the display device according to an embodiment includes a base resin region and a light conversion region on a lower panel having a display element layer, and the light conversion region includes an upper panel having light converters containing quantum dots and liquid crystal ligands to accomplish high light extraction efficiency and low reflectance, thereby exhibiting excellent display quality.
A light control member according to an embodiment includes a base resin region and a light conversion region which are phase-separated to allow for suitable or satisfactory scattering of incident light, and may thus exhibit excellent light extraction efficiency, and does not include light scatterers and may thus exhibit reduced reflectance of external light.
In addition, a display device according to an embodiment includes a light control part that does not include light scatterers and is phase-separated into a base resin region and a light conversion region, and may thus have reduced reflectance of external light and increased light extraction efficiency, thereby exhibiting excellent display quality.
Although described with reference to example embodiments of the present disclosure, it will be understood that various changes and modifications of the subject matter of the present disclosure may be made by one ordinary skilled in the art or one having ordinary knowledge in the art without departing from the spirit and technical field of the present disclosure as hereinafter claimed.
Hence, the technical scope of the present disclosure is not limited to the detailed descriptions in the specification but should be determined only with reference to the claims, and equivalents thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0021083 | Feb 2022 | KR | national |
