Patent Application
20220165991
The present disclosure relates to the field of display technologies, and in particular, to an OLED display panel and a method of manufacturing the same, and an OLED display apparatus.
Organic light-emitting diode (OLED) display technology is a technology that uses organic light-emitting materials to emit light and achieve display under the drive of current.
In one aspect, an OLED display panel is provided. The display panel has a display region including a plurality of sub-pixel regions. The plurality of sub-pixel regions include red sub-pixel regions. The OLED display panel includes a base, light-emitting devices and color resist layers. The light-emitting devices are disposed on the base and located in the red sub-pixel regions. A light-emitting device has a microcavity structure, and a length of the microcavity of the light-emitting device is in a range from 100 nm to 500 nm. The light-emitting device is configured to emit red light. The color resist layers are disposed in the red sub-pixel regions and located at a light-exit sides of the light-emitting devices. A color resist layer is configured such that a transmittance of light with a wavelength of 585 nm or above is greater than a transmittance of light with a wavelength of below 585 nm.
In some embodiments, the color resist layer is configured such that a transmittance of light with a wavelength of 595 nm or above is greater than a transmittance of light with a wavelength of below 595 nm.
In some embodiments, the color resist layer is configured such that a transmittance of light with a wavelength of 605 nm or above is greater than a transmittance of light with a wavelength of below 605 nm.
In some embodiments, the length of the microcavity of the light-emitting device is greater than 200 nm and less than 500 nm.
In some embodiments, the length of the microcavity of the light-emitting device is greater than 200 nm and less than or equal to 350 nm.
In some embodiments, the length of the microcavity of the light-emitting device is greater than 200 nm and less than or equal to 330 nm.
In some embodiments, the length of the microcavity of the light-emitting device is greater than 200 nm and less than or equal to 300 nm.
In some embodiments, the color resist layer is made of an organic polymer.
In some embodiments, the OLED display panel further includes an encapsulation layer. The encapsulation layer is disposed on a side of the light-emitting device away from the base.
In some embodiments, the OLED display panel further includes pixel driving circuits. The pixel driving circuits are disposed between the light-emitting devices and the base. A pixel driving circuit is configured to drive the light-emitting device to emit light.
In some embodiments, the plurality of sub-pixel regions further include green sub-pixel regions adjacent to the red sub-pixel regions. The color resist layer is also located in a region between the red sub-pixel region and a green sub-pixel region.
In some embodiments, the plurality of sub-pixel regions further include blue sub-pixel regions adjacent to the red sub-pixel regions, The color resist layer is also located in a region between the red sub-pixel region and a blue sub-pixel region.
In another aspect, an OLED display apparatus is provided. The OLED display apparatus includes the OLED display panel as described above.
In yet another aspect, a method of manufacturing an OLED display panel is to provided. The OLED display panel has a display region including a plurality of sub-pixel regions. The plurality of sub-pixel regions include red sub-pixel regions. The method includes: forming light-emitting devices on a base and in the red sub-pixel regions; and forming color resist layers in the red sub-pixel regions and at light-exit sides of the light-emitting devices, A light-emitting device has a microcavity structure, and a length of the microcavity of the light-emitting device is in a range from 100 nm to 500 nm. The light-emitting device is configured to emit red light. A color resist layer is configured such that a transmittance of light with a wavelength of 585 nm or above is greater than a transmittance of light with a wavelength of below 585 nm.
In some embodiments, the light-emitting devices are top-emission light-emitting devices. Forming the light-emitting devices and the color resist layers includes: forming the color resist layers on an encapsulation layer; and encapsulating the light-emitting devices by using the encapsulation layer on which the color resist layers have been formed, so that the color resist layers are located between the light-emitting devices and the encapsulation layer.
In some embodiments, the light-emitting devices are top-emission light-emitting devices. Forming the light-emitting devices and the color resist layers includes forming the light-emitting devices, an encapsulation layer and the color resist layers sequentially on the base.
In some embodiments, the light-emitting devices are top-emission light-emitting devices, and the color resist layers are arranged on a side of the encapsulation layer away from the light-emitting devices.
In some embodiments, the light-emitting devices are top-emission light-emitting devices, and the color resist layers are arranged between the encapsulation layer and the light-emitting devices.
In some embodiments, the light-emitting devices are bottom-emission light-emitting devices, and the color resist layers, the light-emitting devices and the encapsulation layer are sequentially arranged on the base.
In some embodiments, the light-emitting devices are bottom-emission light-emitting devices. Forming the light-emitting devices and the color resist layers includes forming the color resist layers, the light-emitting devices and an encapsulation layer sequentially on the base.
In order to describe technical solutions in embodiments of the present disclosure or in the prior art more clearly, accompanying drawings to be used in the description of some embodiments of the present disclosure or the prior art will be briefly introduced below. Obviously, the accompanying drawings to be described below are merely accompanying drawings of some embodiments of the present disclosure, and a person of ordinary skill in the art may obtain other drawings according to these drawings. In addition, the accompanying drawings to be described below may be regarded as schematic diagrams, but are not limitations on an actual size of a product and an actual process of a method involved in the embodiments of the present disclosure.
Technical solutions in some embodiments of the present disclosure will be described below clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely some but not all embodiments of the present disclosure. All other embodiments obtained on the basis of the embodiments of the present disclosure by a person of ordinary skill in the art shall be included in the protection scope of the present disclosure.
As used herein, the singular form “a/an” also includes the plural form, unless the context clearly dictates otherwise. Unless the context requires otherwise, throughout the description and the claims, the term “comprise” and other forms thereof such as the third-person singular form “comprises” and the present participle form “comprising” are construed as an open and inclusive meaning, i.e., “including, but not limited to.” In the description of the specification, terms such as “some embodiments”, “example” or “some examples” are intended to indicate that specific features, structures, materials or characteristics related to the embodiment(s) or example(s) are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms do not necessarily refer to the same embodiment(s) or example(s). In addition, the specific features, structures, materials, or characteristics may be included in any or more embodiments or examples in any suitable manner.
Hereinafter, the terms such as “first” and “second” are only used for descriptive purposes, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined by “first” or “second” may explicitly or implicitly include one or more of the features.
Use of the phrase “configured to” means an open and inclusive expression, which does not exclude devices configured to perform additional tasks or steps.
Terms such as “about” as used herein include a stated value and an average value within an acceptable range of deviation of a particular value. The acceptable range of deviation is determined by a person of ordinary skill in the art in view of the measurement in question and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system).
Exemplary embodiments are described herein with reference to cross-sectional views and/or plan views as idealized exemplary drawings. In the accompanying drawings, thicknesses of layers and sizes of regions are enlarged for clarity. Therefore, the exemplary embodiments should not be construed as being limited to the shapes of the areas shown herein, but including shape deviations due to, for example, manufacturing. The areas shown in the accompanying drawings are schematic in nature, and their shapes are not intended to show actual shapes of the areas in a device, and are not intended to limit the scope of the exemplary embodiments.
An organic light-emitting diode (OLED) display apparatus may be used as a product or a component having any display function, such as a mobile phone, a tablet computer, a personal digital assistant (FDA), a vehicle-mounted display, a TV, a digital photo frame or a navigator, which is not limited in embodiments of the present disclosure.
In some embodiments, as shown in
For example, a section of the frame 1 is U-shaped. The OLED display panel 2, the circuit board 4 and the FPC 5 are disposed in a cavity enclosed by the frame 1 and the cover plate 3. The cover plate 3 is disposed at a light-exit side of the OLED display panel 2. An end of the FPC 5 is bonded to an edge of the OLED display panel 2, and another end of the FPC 5 is bonded to the circuit board 4. The circuit board 4 is disposed on a side of the OLED display panel 2 facing away from the cover plate 3.
In some examples, the FPC 5 includes a FPC body and at least one driver chip disposed on the FPC body. The driver chip may be a driver integrate circuit (10). For example, at least one driver IC includes at least one data driver IC.
In some examples, the circuit board 4 is configured to provide the OLED display panel 2 with signals required for display. For example, the circuit board 4 is a printed circuit board assembly (PCBA), and the PCBA includes a printed circuit board (PCB) and a timing controller (TCON), a power management IC (PMIC), and other ICs or circuits that are disposed on the PCB.
Some embodiments of the present disclosure provide the OLED display panel 2. As shown in
As shown in
Here, the microcavity structure means that a structure of the light-emitting device 11 satisfies a microcavity effect. The microcavity effect is as follows: in a case where a light-emitting region of the light-emitting device 11 is located in a resonant cavity formed by a total reflection electrode and a semi-reflection electrode, and a cavity length of the resonant cavity is in the same order of magnitude as a wavelength of light, light with a specific wavelength is selected and strengthened to narrow a spectrum. Based on this, the length of the microcavity is the cavity length of the resonant cavity.
In some examples, as shown in
The light-emitting device 11 may be a top-emission light-emitting device or a bottom-emission light-emitting device. By taking an example in which the first electrode 111 is the anode and the second electrode 113 is the cathode, in a case where the light-emitting device 11 is the top-emission light-emitting device, the second electrode 113 is the transflective electrode, and the first electrode 111 is the reflective electrode. The first electrode 111 is, for example, a stacked structure including a transparent conductive sub-electrode and at least one opaque metal sub-electrode, and the second electrode 113 is a metal electrode with a relatively small thickness; in a case where the light-emitting device 11 is the bottom-emission light-emitting device, the first electrode 111 is th transflective electrode, and the second electrode 113 is the reflective electrode. The first electrode 111 is, for example, a stacked structure including a transparent conductive sub-electrode and at least one metal sub-electrode, a thickness of the at least one metal sub-electrode is relatively small, and the second electrode 113 is an opaque metal electrode.
The length of the microcavity of the light-emitting device 11 is a distance from a surface of the first electrode 111 proximate to the second electrode 113 to a surface of the second electrode 113 proximate to the first electrode 111.
As described above, the OLED display panel 2 may be applied to a vehicle-mounted display in a vehicle. The vehicle-mounted display may be used to display road condition information, driving information and the like, so as to facilitate safe driving of a driver. European vehicle regulations have strict requirements on a dominant wavelength of red light emitted by a vehicle-mounted display. The European vehicle regulations require that color of the red light should be dark red. That is, the dominant wavelength of the red light should be in a range from 618 nm to 630 nm, and a center value of the dominant wavelength of the red light is 623 nm.
However, the color of the red light of the current display is not deep enough, and the dominant wavelength thereof may only reach 613 nm at a maximum, which is unable to meet the requirements of the European vehicle regulations.
In the OLED display panel 2 provided in some embodiments of the present disclosure, the color resist layer 121 is provided in the red sub-pixel region 101 and on the light-exit side of the light-emitting device 11 to make the transmittance of the light with the wavelength of 585 nm or above emitted by the light-emitting device 11 greater than the transmittance of the light with the wavelength of below 585 nm emitted by the light-emitting device 11. That is, the color resist layer 121 may filter most of the light with the wavelength of below 585 nm, redshift a spectrum of light passing through the color resist layer 121, and narrow a high transmission band of the red light passing through the color resist layer 121. As a result, a dominant wavelength of the light passing through the color resist layer 121 is increased. On this basis, the light emitted by the light-emitting functional layer 112 is reflected multiple tunes in the resonant cavity and the reflected light interferes with each other, and finally a spectrum of light emitted from the light-emitting device 11 forms an OLED display spectrum. By setting the length of the microcavity of the light-emitting device 11 to be in a range from 100 nm to 500 nm, a color coordinates of the OLED display spectrum shifts toward a long wavelength relative to an intrinsic spectrum, so as to further increase the dominant wavelength of the light passing through the color resist layer 121, and thus the red light emitted by the OLED display panel 2 is dark red, which meets the European vehicle regulations.
In some embodiments, the base 10 may be a flexible base or a rigid base. For example, the flexible base is made of polyimide (PI) or polyethylene terephthalate (PET). For example, the rigid base is made of glass.
In some embodiments, the color resist layers 121 are only disposed in the red sub-pixel regions 101. In some examples, as shown in
In some other embodiments, the color resist layer 121 extends from the red sub-pixel region 101 to a region between the red sub-pixel region 101 and a sub-pixel region adjacent thereto.
In some examples, as shown in
In some other examples, as shown in
In yet some other examples, as shown in
Each of the green sub-pixel region 102 and the blue sub-pixel region 103 is provided with a light-emitting device 11, The light-emitting device 11 located in the red sub-pixel region 101 is configured to emit red light, the light-emitting device 11 located in the green sub-pixel region 102 is configured to emit green light, and the light-emitting device 11 located in the blue sub-pixel region 103 is configured to emit blue light.
In the case where the color resist layer 121 is located in the red sub-pixel region 101, the region between the red sub-pixel regions 101 and the adjacent green sub-pixel region 102, and the region between the red sub-pixel region 101 and the adjacent blue sub-pixel region 103, in the light emitted by the light-emitting device 11 located in the red sub-pixel region 101, not only light in a vertical direction tcan be incident onto the color resist layer 121, but also light at other angles can be incident onto the color resist layer 121. Therefore, it is ensured that the color resist layer 121 is able to filter light at all angles.
Hereinafter, the OLED display panel 2 will be described by taking an example where the display region A includes the red sub-pixel regions 101, the green sub-pixel regions 102 and the blue sub-pixel regions 103.
In some embodiments, the OLED display panel 2 further includes a pixel driving circuit located in each sub-pixel region and disposed between the base 10 and the light-emitting device 11. The pixel driving circuit is configured to drive the light-emitting device 11 to emit light. The pixel driving circuit includes a plurality of transistors and a capacitor. The base 10 and the pixel driving circuit disposed thereon constitute an array substrate of the OLED display panel 2.
The plurality of transistors include at least two switching transistors and a driving transistor, and one of the plurality of transistors is electrically connected to the light-emitting device 11 (e.g., the first electrode 111 of the light-emitting device 11). As shown in
In some examples, the switching transistors and the driving transistor 14 are thin film transistors. The thin film transistors may be top-gate thin film transistors, bottom-gate thin film transistors or double-gate thin film transistors.
It will be noted that, in order to make light emitted by the light-emitting device 11 located in the green sub-pixel region 102 and light emitted by the light-emitting device 11 located in the blue sub-pixel region 103 exit normally, and the color resist layer 121 is only used to filter the light emitted by the light-emitting device 11 located in the red sub-pixel region 101, the color resist layer 121 is not located in the green sub-pixel region 102 and the blue sub-pixel region 103.
A material of the color resist layer 121 is not limited in the embodiments of the present disclosure, as long as the color resist layer 121 may make the transmittance of the light with the wavelength of 585 nm or above greater than the transmittance of the light with the wavelength of below 585 nm.
In some examples, the color resist layer 121 is made of an organic polymer. For example, the organic polymer is polymerized by organic pigment, dispersion resin, multifunctional acrylic monomer, high boiling point solvent and other additives. The spectrum of the light passing through the color resist layer 121 is mainly determined by the organic pigment in the organic polymer, The smaller a molecular structure of the organic pigment is, the higher a transmittance of the color resist layer 121 is. In addition, the spectrum of the light passing through the color resist layer 121 is also related to a ratio of various materials and a preparation process during preparing the organic polymer.
For example, the organic pigment is a diketopyrrolopyrrole organic pigment. For example, the high boiling point solvent is polymethacrylates (PMA).
In some embodiments, as shown in
For example, as shown in
A material of the light-transmitting layers 122 is not limited in the embodiments of the present disclosure, as long as it does not affect normal exiting of the light emitted by the light-emitting device 11 located in the green sub-pixel region 102 and the light-emitting device 11 located in the blue sub-pixel region 103.
In some examples, the material of the light-transmitting layer 122 includes a material having high transmittance such as Pl.
In some embodiments, as shown in
In some examples, as shown in
In some other examples, as shown in
In some other examples, as shown in
In some embodiments, the color resist layer 121 is configured such that a transmittance of light with a wavelength of 595 nm or above is greater than a transmittance of light with a wavelength of below 595 nm.
In some other embodiments, the color resist layer 121 is configured such that a transmittance of light with a wavelength of 605 nm or above is greater than a transmittance of light with a wavelength of below 605 nm.
In some embodiments, the length of the microcavity of the light-emitting device 11 is greater than 200 nm and less than 500 nm.
In some examples, the length of the microcavity of the light-emitting device 11 is greater than 200 nm and less than or equal to 350 nm For example, the length of the microcavity of the light-emitting device 11 is 275 nm.
In some other examples, the length of the microcavity of the light-emitting device 11 is greater than 200 nm and less than or equal to 330 nm. For example, the length of the microcavity of the light-emitting device 11 is 265 nm,
In yet some other examples, the length of the microcavity of the light-emitting device 11 is greater than 200 nm and less than or equal to 300 nm. For example, the length of the microcavity of the light-emitting device 11 is 250 nm.
Hereinafter, spectrum diagrams of red light emitted by OLED display panels 2 provided in the embodiments of the present disclosure are obtained through simulation, and the dominant wavelength is determined according to color coordinates of the emitted red light.
In summary, the dominant wavelength of the red light emitted by the OLED display panel 2 provided in the embodiments of the present disclosure meets the standards of European vehicle regulations.
Some embodiments of the present disclosure further provide a method of manufacturing an OLED display panel. As shown in
The method includes: forming light-emitting devices 11 on a base 10 and in the red sub-pixel regions 101, and forming color resist layers 121 in the red sub-pixel regions 101 and at a light-exit side of the light-emitting devices 11. The light-emitting device 11 has a microcavity structure, and a length of the microcavity of the light-emitting device 11 is in a range from 100 nm to 500 nm, The light-emitting devices 11 located in the red sub-pixel regions 101 are configured to emit red light. The color resist layers 121 are configured such that the transmittance of the light with a wavelength of 585 nm or above is greater than the transmittance of the light with a wavelength of below 585 nm,
A sequence of manufacturing the color resist layer 121 and the light-emitting device 11 is not limited in the embodiments of the present disclosure, as long as the color resist layer 121 is located at the light-exit side of the light-emitting device 11.
In some embodiments, the light-emitting device 11 is a top-emission light-emitting device.
In some examples, the method includes: as shown in
In some other examples, the method includes: as shown in
In some other embodiments, the light-emitting device 11 is a bottom-emission light-emitting device, The method includes: as shown in
The method of the OELD display panel provided in the embodiments of the present disclosure has the same beneficial effects as the above OELD display panel 2, which is repeated herein.
The foregoing descriptions are merely specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Changes or replacements that any person skilled in the art could conceive of within the technical scope of the present disclosure shall be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201911285804.X | Dec 2019 | CN | national |
This application is a national phase entry under 35 USC 371 of International Patent Application No. PCT/CN2020/131626, filed on Nov. 26, 2020, which claims priority to Chinese Patent Application No. 201911285804.X, filed on Dec. 13, 2019, which are incorporated herein by reference in their entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2020/131626 | 11/26/2020 | WO | 00 |
