Patent Application
20190006328
The disclosure relates to display devices, and in particular to a display device with a short-wavelength light filter layer.
In display devices that use a quantum-dots technique, narrow waveform color light can be obtained by using short-wavelength (such as blue light) light-emitting diodes (LEDs) and converting the light color through a quantum dot material. Therefore, the color saturation of the display device can be enhanced.
However, if the converting efficiency of the quantum dot material needs to be enhanced, shorter wavelength LEDs must be used. Using shorter wavelength LEDs may cause the display device to not conform to a specific color gamut standard (such as sRGB, DCI-P3, or Adobe RGB). In addition, ambient light, which is incident from outside the display device, may cause the LEDs or quantum dot materials to reflect or excite unnecessary light. Therefore, the contrast of the display device is decreased.
Some embodiments of the disclosure provide a display device, including a first substrate, a first light-emitting element, a second substrate, a light conversion layer and a light filter layer. The first light-emitting element is disposed on the first substrate. The second substrate is opposite to the first substrate. The light conversion layer is disposed on the second substrate and corresponds to the first light-emitting element. The light filter layer is disposed on the second substrate, wherein the transmittance of the light filter layer is lower than or equal to 1% for light with a wavelength shorter than 430 nm.
To clarify the features and advantages of the present disclosure, a detailed description is given in the following embodiments with reference to the accompanying drawings.
The disclosure can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
The display devices in some embodiments of the present disclosure are described in detail in the following description. It should be appreciated that the following detailed description provides various embodiments and examples in order to perform various patterns of the present disclosure. The specific elements and configurations described in the following detailed description are set forth in order to clearly describe the present disclosure. It will be apparent that the exemplary embodiments set forth herein are used merely for the purpose of illustration, and the inventive concept may be embodied in various forms without being limited to those exemplary embodiments. In addition, the drawings of different embodiments may use repeated numerals or marks. Those repetitions are used merely in order to clearly describe the present disclosure. However, the use of repeated numerals in the drawings of different embodiments does not suggest any correlation between different embodiments and/or configurations. In addition, in this specification, expressions such as “first material layer disposed on/over/above a second material layer”, may indicate the direct contact of the first material layer and the second material layer, or it may indicate a non-contact state with one or more intermediate layers between the first material layer and the second material layer. In the above situation, the first material layer may not be in direct contact with the second material layer.
It should be understood that elements or devices in the figures may exist in various forms which are known to those skilled in the art. In addition, when a certain layer is “on” another layer or the substrate, it may indicate the certain layer is “directly” on the other layer or the substrate, or the certain layer is over the other layer or the substrate, or another layer is disposed between the other layer and the substrate.
In addition, in this specification, relative expressions may be used. For example, “lower”, “bottom”, “higher” or “top” are used to describe the position of one element relative to another. It should be appreciated that if a device is flipped upside down, an element that is “lower” will become an element that is “higher”.
The terms “about”, “substantially” and “approximately” typically mean +/−20% of the stated value, more typically +/−10% of the stated value, more typically +/−5% of the stated value, more typically +/−3% of the stated value, more typically +/−2% of the stated value, more typically +/−1% of the stated value and even more typically +/−0.5% of the stated value. The stated value of the present disclosure is an approximate value. When there is no specific description, the stated value includes the meaning of “about”, “substantially”, or “approximately”.
It should be understood that, although the terms “first”, “second”, “third” etc. may be used herein to describe various elements, components, regions, layers and/or portions, and these elements, components, regions, layers and/or portions should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, and/or portion. Thus, a first element, component, region, layer and/or portion discussed below could be termed a second element, component, region, layer or portion without departing from the teachings of the present disclosure.
Unless defined otherwise, all the 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 this disclosure belongs. It should be appreciated that, in each case, the term, which is defined in a commonly used dictionary, should be interpreted as having a meaning that conforms to the relative skills of the present disclosure and the background or the context of the present disclosure, and should not be interpreted in an idealized or overly formal manner unless so defined in the present disclosure.
This description of the exemplary embodiments is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description. It should be appreciated that the drawings are not drawn to scale. The shape and the thickness of embodiments may be exaggerated in the drawings to clarify the features of the present disclosure. In addition, structures and devices are shown schematically in order to clarify the features of the present disclosure.
In some embodiments of the present disclosure, relative terms such as “downwards,” “upwards,” “horizontal,” “vertical,”, “below,” “above,” “top” and “bottom” as well as derivative thereof should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description and do not require that the apparatus be constructed or operated in a particular orientation. Terms concerning attachments, coupling and the like, such as “connected” and “interconnected,” refer to a relationship wherein structures are in contact with one another either directly or indirectly, wherein there are other structures disposed between both the structures, unless expressly described otherwise. These relative terms also include the relationships wherein both structures are movable or rigid attachments.
It should be noted that, the term “substrate” is meant to include elements formed on a glass substrate and various layers overlying the glass. All semiconductor element needed may be already formed on the glass substrate. However, the glass substrate is represented with a flat substrate in order to simplify the drawing. In addition, the term “substrate surface” is meant to include the uppermost exposed layers on a glass substrate, such as an insulating layer and/or metallic lines.
The embodiments of the present disclosure provides a display device with a short-wavelength light filter layer, and thereby in the case where the conversion efficiency of the quantum dot material is enhanced, the display device still conforms to a specific color gamut standard. Also, the external ambient light is prevented from being reflected or excited as an unnecessary light so that the contrast is decreased.
The disclosure may be used in electronic device, for example a display device, sensing device. And the electronic may be a tiled electric device. The display device may be a tiled display, OLED display, LED display, Flexible display.
In general, no matter which the color semiconductor quantum dot material is, the color semiconductor quantum dot material has great absorption intensity for light with a wavelength shorter than 430 nm. Therefore, if using the semiconductor quantum dot material and a light source in which the peak wavelength is shorter than 430 nm, the light conversion efficiency of the quantum dot material can be enhanced. A green quantum dot material is described as an example in the following.
However, if using LEDs in which peak wavelength is shorter than 430 nm, blue light color points of the display device would not conform to a specific color gamut standard (such as sRGB, DCI-P3, or Adobe RGB). In addition, ambient light that is incident from outside into the display device may cause the LEDs or quantum dot materials reflect or excite unnecessary light. Therefore, the contrast of the display device is decreased.
Then, referring to
The first substrate 10 may be a thin-film transistor array substrate, including a plurality of thin-film transistors. Driving circuits (such as gate lines, data lines, or capacitors) of the thin-film transistor array substrate, which are configured to drive the first light-emitting elements 11 and the second light-emitting element 11′, are partially omitted. The base materials of the first substrate 10 may include quartz, glass, polymethylmethacrylate (PMMA), polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene naphthalate (PBN). However, the base materials of the first substrate 10 are not limited thereto, as long as rigid (low degree of flexibility) or flexible (high degree of flexibility) materials that are suitable for the substrate are used.
Still referring to
The light filter layer 21 is disposed on the second substrate 20, and the transmittance of the light filter layer 21 is lower than or equal to 1% for light with a wavelength shorter than 430 nm. In this embodiment, the light filter layer 21 is disposed on one side of the second substrate 20, which is adjacent to the first substrate 10, and the light filter layer 21 patternedly corresponds to the first light-emitting elements 11. In this embodiment, the term “corresponds to” means that the light filter layer 21 and the light-emitting element 11 are at least partially overlapping in a normal direction of a surface 20a of the second substrate 20. The light filter layer 21 include a polymer material capable of absorbing short-wavelength light, or a structure that obstruct penetration of short-wavelength light using interference effect, such as a photoresist or a multi-layer film structure. However, the structure is not limited thereto. The materials of the second substrate 20 may include quartz, glass, polymethylmethacrylate (PMMA), polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene naphthalate (PBN). However, the materials of the second substrate 20 are not limited thereto, as long as rigid (low degree of flexibility) or flexible (high degree of flexibility) materials that are suitable for the second substrate 20 are used.
Still referring to
Accordingly, in the case that the conversion efficiency is enhanced by using the light conversion layer 22 and the first light-emitting elements 11, the display device can still conform to a specific color gamut standard by the structural design of the first light-emitting elements 11, the light filter layer 21, and the light conversion layer 22. Also, in this way, external ambient light with a short wavelength is prevented from being excited or reflected so that the contrast is decreased.
The color filter layer 23 is disposed on the second substrate 20, and the scattering layer 24 is disposed on the color filter layer 23. In this embodiment, the color filter layer 23 is a blue color filter layer that corresponds to the second light-emitting element 11′, and configured to serve as a blue pixel in the display device 1. In this embodiment, the term “corresponds to” means that the color filter layer 23 and the second light-emitting element 11′ are at least partially overlapping in the normal direction of the surface 20a of the second substrate 20. The shielding layer 25 and the barrier layer 26 are disposed on the second substrate 20, and the shielding layer 25 and the barrier layer 26 respectively correspond to the filling layer 12. In this embodiment, the term “correspond to” means that the shielding layer 25, the barrier layer 26 and the filling later 12 are at least partially overlapping in the normal direction of the surface 20a of the second substrate 20. The shielding layer 25 and the barrier layer 26 are disposed between various color pixels, and are configured to improve that lights from various color pixels mix together. In this embodiment, the shielding layer 25 and the barrier layer 26 are formed in different processes. However, it should be noted that the shielding layer 25 and the barrier layer 26 may also be formed of the same material in the same process. In some embodiments, the light filter layer 21 may be formed between the shielding layer 25 and the second substrate 20 as a whole surface without being patterned. Also, the light filter layer 21 may be formed between the shielding layer 25 and the barrier layer 26 as a whole surface without being patterned. The bonding layer 30 is disposed between the first substrate 10 and the second substrate 20. After the aforementioned elements are respectively formed on the first substrate 10 and the second substrate 20, the bonding layer 30 is configured to bond and combine the first substrate 10 and the second substrate 20. The material of the bonding layer 30 may be an optical cement. However, the material of the bonding layer 30 is not limited in the present disclosure, as long as the material used allows the light of the light-emitting element to penetrate and is capable of bonding the first substrate 10 and the second substrate 20.
Next, referring to
As shown in
Then, referring to the dotted line shown in
Referring to
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Therefore, there is a lower possibility that the quantum dot material will become excited by the external ambient light with a short wavelength, or that the light source will reflect light so that the contrast of the display device can be improved in the configuration of the light conversion layer 22 and the first light-emitting elements 11 by arranging the color filter layers (i.e. red, green, and blue photoresists).
As shown in
Next, referring to
Therefore, conversion efficiency is enhanced in the configuration of the light conversion layer 22 and the first light-emitting elements 11, but the display device still conforms to the specific color gamut standard (such as sRGB, DCI-P3, or Adobe RGB) by arranging the color filter layers (i.e. red, green, and blue photoresists) as indicated in the embodiments shown in
Referring to
Referring to
Referring to
Referring to
Referring to
Referring to
As set forth above, the present disclosure provides a display device with a short-wavelength light filter layer, and thereby in the case where the conversion efficiency of the quantum dot material is enhanced, the display device still conforms to the specific color gamut standard. Also, that the contrast is decreased due to the external ambient light with a short wavelength is improved.
It should be noted that the aforementioned sizes, parameters and shapes of the elements are not limitations of the present disclosure. Those skilled in the art may adjust these settings according to different needs. Moreover, the organic light-emitting diode displays and the methods for manufacturing the same of the present disclosure are not limited to the configurations shown in
While the present disclosure has been described by way of example and in terms of some embodiments, it is to be understood that those skilled in the art may make various changes, substitutions, and alterations to the present disclosure without departing from the spirit and scope of the present disclosure. For example, different features in different embodiments can mix together to form another embodiment of the present disclosure. In addition, the scope of the present disclosure is not limited to the processes, machines, manufacture, composition, devices, methods and steps in the specific embodiments described in the specification. From some embodiments of the present disclosure, those skilled in the art may understand existing or developing processes, machines, manufacture, compositions, devices, methods and steps, which may be performed in the aforementioned embodiments or obtained substantially the same result, may be used in accordance with some embodiments of the present disclosure. Therefore, the scope of the present disclosure includes the aforementioned processes, machines, manufacture, composition, devices, methods, and steps. Furthermore, each of the appended claims constructs an individual embodiment, and the scope of the present disclosure also includes every combination of the appended claims and embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201711435140.1 | Dec 2017 | CN | national |
This application claims the benefit of U.S. Provisional Application No. 62/527,198, filed Jun. 30, 2017, and claims priority of China Patent Application No. 201711435140.1, filed Dec. 26, 2017, the entirety of which are incorporated by reference herein.
| Number | Date | Country | |
|---|---|---|---|
| 62527198 | Jun 2017 | US |
