CN114171572B - Display module - Google Patents
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- CN114171572B CN114171572B CN202111489232.4A CN202111489232A CN114171572B CN 114171572 B CN114171572 B CN 114171572B CN 202111489232 A CN202111489232 A CN 202111489232A CN 114171572 B CN114171572 B CN 114171572B
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- layer
- filter layer
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- optical filter
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
Abstract
The application discloses display module assembly, display module assembly includes: an organic light emitting diode display layer; the color filter layer is positioned on the light emitting side of the organic light emitting diode display layer; and the optical filter layer is positioned on one side of the color filter layer far away from the organic light-emitting diode display layer, and the transmittance of the optical filter layer to ultraviolet light is smaller than that of the optical filter layer to visible light. The optical filter layer is arranged on one side, far away from the organic light-emitting diode display layer, of the color filter layer, and the transmittance of the optical filter layer to ultraviolet light is smaller than that of the optical filter layer to visible light, so that the ageing caused by the ultraviolet light irradiating the color filter layer is improved, and the environmental stability of the display module is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a display module.
Background
At present, a Color film layer (Color Filter) is formed on the light-emitting surface of the organic light-emitting diode display layer instead of a polaroid (polar), which is beneficial to reducing the overall thickness of the organic light-emitting diode display panel and improving the light-emitting rate of the organic light-emitting diode display panel. However, the addition of the color film layer may cause a decrease in the environmental stability of the organic light emitting diode display panel.
Disclosure of Invention
An object of the present application is to provide a display module assembly to improve the environmental stability of the display module assembly.
In order to achieve the above purpose, the technical scheme is as follows:
a display module, the display module comprising:
an organic light emitting diode display layer;
the color filter layer is positioned on the light emitting side of the organic light emitting diode display layer; and
the optical filter layer is positioned on one side of the color filter layer far away from the organic light-emitting diode display layer, and the transmittance of the optical filter layer to ultraviolet light is smaller than that of the optical filter layer to visible light.
In the above display module, the optical filter layer includes a transparent organic layer and an ultraviolet absorber dispersed in the transparent organic layer.
In the above display module, the transparent organic layer is a polyimide layer.
In the above display module, the thickness of the optical filter layer is 20 micrometers to 100 micrometers.
In the above display module, the optical filter layer and the color filter layer are adhered by an adhesive layer.
In the above-mentioned display module assembly, the color filter layer includes a plurality of different colored color resistance units, the display module assembly still includes:
the black matrix layer comprises a plurality of openings and a plurality of black matrix blocks, wherein the color resistance units are arranged in the openings, and the black matrix blocks are arranged between two adjacent color resistance units with different colors.
In the above display module, the display module further includes:
and one part of the planarization layer is arranged between the adhesive layer and the black matrix layer, and the other part of the planarization layer is arranged between the adhesive layer and the color filter layer.
In the display module, the transmittance of the optical filter layer to the visible light with the first preset wavelength is smaller than that to the visible light with the second preset wavelength, and the first preset wavelength is smaller than that of the second preset wavelength.
In the above display module, the first preset wavelength is greater than 380 nm and less than 420 nm, and the second preset wavelength is greater than or equal to 420 nm.
In the display module, the transmittance of the optical filter layer to the visible light with the first preset wavelength is less than or equal to 40%, the transmittance of the optical filter layer to the visible light with the second preset wavelength is greater than or equal to 90%, and the transmittance of the optical filter layer to the ultraviolet light is less than or equal to 10%.
The beneficial effects are that: the application provides a display module assembly sets up the optical filter layer through one side that organic light emitting diode display layer was kept away from at the color filter layer, and the optical filter layer is less than the optical filter layer to the transmissivity of visible light outward to improve the ageing that ultraviolet shines the color filter layer and cause it outward, promote display module assembly's environmental stability.
Drawings
Fig. 1 is a schematic diagram of a display module according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of a display module according to a second embodiment of the present disclosure;
fig. 3 is a schematic illustration of a film stack of two different configurations.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Please refer to fig. 1, which is a schematic diagram of a display module according to a first embodiment of the present application. The display module includes an organic light emitting diode display panel 10, an optical filter layer 30 and a protective cover 50. The optical filter layer 30 is disposed between the organic light emitting diode display panel 10 and the protective cover 50.
In the present embodiment, the organic light emitting diode display panel 10 includes a substrate 100, a thin film transistor array layer 101, an organic light emitting diode display layer 102, an encapsulation layer 103, a touch layer 104, a color filter layer 105, and a black matrix layer 106.
Wherein the substrate 100 is a flexible substrate, for example, the flexible substrate includes polyimide.
The thin film transistor array layer 101 is disposed on the substrate 100, and includes a plurality of thin film transistors arranged in an array.
The organic light emitting diode display layer 102 is disposed on a side of the thin film transistor array layer 101 away from the substrate 100. The organic light emitting diode display layer 102 includes a plurality of organic light emitting diodes arranged in an array, the organic light emitting diodes include a cathode, an anode, and an organic light emitting layer disposed between the cathode and the anode. The plurality of organic light emitting diodes arranged in an array comprise red organic light emitting diodes, blue organic light emitting diodes and green organic light emitting diodes. It can be understood that the plurality of organic light emitting diodes arranged in an array can be all blue light organic light emitting diodes, and blue light emitted by the blue light organic light emitting diodes is converted into red light and green light through the quantum dot color conversion layer; alternatively, the plurality of organic light emitting diodes arranged in an array may be white organic light emitting diodes.
It should be noted that, since the organic light emitting diode display layer 102 includes an organic light emitting layer, and the service life of the organic light emitting diode is affected when the temperature of the organic light emitting layer is higher than 90 ℃, the film layer formed after the organic light emitting diode display layer 102 needs to be formed in an environment where the temperature is lower than 90 ℃.
The encapsulation layer 103 serves to protect the organic light emitting diode display layer 102 from the cathode of the organic light emitting diode and the organic light emitting layer from water, oxygen, and the like. The encapsulation layer 103 is disposed on a side of the organic light emitting diode display layer 102 away from the thin film transistor array layer 101. The encapsulation layer 103 is a thin film encapsulation layer, and the thin film encapsulation layer includes a first inorganic layer, a second inorganic layer, and an organic layer, where the organic layer is disposed between the first inorganic layer and the second inorganic layer, and the first inorganic layer is disposed near the organic light emitting diode display layer 102. It is understood that the encapsulation layer 103 may also be an encapsulation cover plate.
The touch layer 104 is integrated on a side of the encapsulation layer 103 away from the organic light emitting diode display layer 102. The touch layer 104 may include self-capacitance touch electrodes or mutual capacitance touch electrodes. It is understood that the touch layer 104 may also be disposed on a separate substrate and connected to the encapsulation layer 103 through an adhesive layer.
The color filter layer 105 is located on the light emitting side of the organic light emitting diode display layer, and the color filter layer 105 is located on the side of the touch layer 104 away from the encapsulation layer 103. The color filter layer 105 includes a first color resist unit 1051, a second color resist unit 1052 and a third color resist unit 1053, wherein the colors of the first color resist unit 1051, the second color resist unit 1052 and the third color resist unit 1053 are different from each other, and the first color resist unit 1051, the second color resist unit 1052 and the third color resist unit 1053 are respectively arranged one-to-one with a plurality of organic light emitting diodes. Specifically, the first color resist unit 1051 is a red color resist unit, the second color resist unit 1052 is a green color resist unit, and the third color resist unit 1053 is a blue color resist unit.
It should be noted that, because the organic light emitting layer cannot be limited in the process under the environment with the temperature higher than 90 ℃, the color filter layer 105 is prepared by initiating the acryl material with the photo-curing initiator under the condition with the temperature lower than 90 ℃, which results in the reduction of the environmental stability of the color filter layer 105, for example, the color filter layer 105 is easy to age under the condition of sunlight or ultraviolet irradiation, and the aging of the color filter layer 105 results in the reduction of the light transmittance of the color filter layer 105. The color filter layer in the liquid crystal display panel is prepared by initiating the acrylic material through the heat curing initiator, so that the environmental stability of the color filter layer in the liquid crystal display panel is better, the color filter layer in the liquid crystal display panel has better tolerance to sunlight or ultraviolet irradiation, and the color filter layer in the liquid crystal display panel does not improve or solve the ageing requirements caused by sunlight or ultraviolet irradiation and the like.
The black matrix layer 106 includes a plurality of black matrix blocks 1061 and a plurality of openings 1062 distributed in the plurality of black matrix blocks 1061, the first color resist unit 1051, the second color resist unit 1052 and the third color resist unit 1053 are respectively disposed in the plurality of openings 1062, and the black matrix blocks 1061 are disposed between two adjacent color resist units of different colors.
In the present embodiment, the optical filter layer 30 is disposed on a side of the color filter layer 105 away from the organic light emitting diode display layer 102. The transmittance of the optical filter layer 30 to ultraviolet light is smaller than that of the optical filter layer 30 to visible light, so that the flux of ultraviolet light or sunlight entering the color filter layer 105 through the optical filter layer 30 is reduced, the aging phenomenon of the color filter layer 105 caused by the ultraviolet light or sunlight is improved, and the problem of the transmittance reduction caused by the aging of the color filter layer 105 is further solved.
Wherein, the transmittance of the optical filter layer 30 to the ultraviolet light is less than or equal to 10%, so as to avoid the ultraviolet light reaching the color filter layer 105 and causing the aging of the color filter layer 105. For example, the optical filter layer 30 has a transmittance of 0.8%, 1.2%, 2%, 3%, 4%, 5%, 6%, or 8% for ultraviolet light.
The optical filter layer 30 has a smaller transmittance for the visible light of the first preset wavelength than for the visible light of the second preset wavelength, so that the transmittance for the visible light with a short wavelength and a high energy in the visible light is lower to improve the aging phenomenon of the color filter layer 105 caused by the visible light, and the transmittance for the visible light with a short wavelength and a low energy in the visible light is high to ensure the light output rate of the light emitted by the organic light emitting diode display layer 102, thereby ensuring the display effect.
Specifically, the first preset wavelength is greater than 380 nm and less than 420 nm, and the second preset wavelength is greater than or equal to 420 nm, so that the transmittance of visible light with short wavelength and high energy in visible light is low, and the transmittance of visible light with short wavelength and low energy in visible light is high. For example, the first preset wavelength is 385 nm, 400 nm, 410 nm, or 415 nm, and the second preset wavelength is 425 nm, 450 nm, 500 nm, 550 nm, 600 nm, 650 nm, or 700 nm.
Wherein, the transmittance of the optical filter layer 30 to the visible light with the first preset wavelength is less than or equal to 40%, and the transmittance of the optical filter layer 30 to the visible light with the second preset wavelength is greater than or equal to 90%, so as to improve the aging phenomenon of the color filter layer 105 caused by the high-energy visible light and ensure the transmittance of the optical filter layer 30 to the visible light for main display. For example, the optical filter layer 30 has a transmittance of 12%, 15%, 20%, 25%, 30%, or 35% for the first preset wavelength of visible light, and the optical filter layer 30 has a transmittance of 95% or 98% for the second preset wavelength of visible light.
It should be noted that, the light with the wavelength in the range of more than 380 nm and less than 420 nm belongs to visible light, namely, can be identified by human eyes, the energy of the visible light in the wavelength band is high, the photoresist of the color film layer in the embodiment is easy to age, and meanwhile, the visible light in the wavelength band is also used for displaying, so that the transmittance of the light in the wavelength band is less than or equal to 40% in order to balance the performance stability of the color film layer and ensure the display effect. The visible light with the wavelength of more than or equal to 420 nanometers has low energy and small influence on the photoresist aging of the color film layer, and in order to ensure the display effect, the visible light transmittance of the wave band is more than or equal to 90 percent.
In the present embodiment, the optical filter layer 30 includes a transparent organic layer and an ultraviolet light absorber dispersed in the transparent organic layer. The ultraviolet light absorber of the embodiment can absorb ultraviolet light and also can absorb part of visible light with high energy, for example, the visible light with the wavelength in the range of more than 380 nanometers and less than 420 nanometers. Wherein the ultraviolet light absorber can be selected from any one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines and hindered amines. The transparent organic layer is a polyimide layer. The thickness of the optical filter layer 30 is 20 microns to 100 microns, for example 30 microns, 40 microns, 50 microns, 60 microns, 70 microns or 80 microns.
In the present embodiment, the optical filter layer 30 and the color filter layer 105 are adhered by the first adhesive layer 20. The optical filter layer 30 is integrated with the first adhesive layer 20, and the optical filter layer 30 is attached to the organic light emitting diode display panel 10 through the first adhesive layer 20. Wherein the first adhesive layer 20 is a transparent organic adhesive layer.
In the present embodiment, the protective cover 50 is located on a side of the optical filter layer 30 away from the color filter layer 105, and the protective cover 50 is adhered to the optical filter layer 30 through the second adhesive layer 40. The protective cover 50 is a transparent glass cover, and the second adhesive layer 40 is a transparent organic adhesive layer.
According to the display module, the optical filter layer is arranged on one side, far away from the organic light emitting diode display layer, of the color filter layer, and the transmittance of the optical filter layer to ultraviolet light is smaller than that of the optical filter layer to visible light, so that ageing caused by the fact that the color filter layer is irradiated to the ultraviolet light is improved, and the environmental stability of the display module is improved.
Please refer to fig. 2, which is a schematic diagram of a display module according to a second embodiment of the present application. The display module shown in fig. 2 is substantially similar to the display module shown in fig. 1, except that the display module 300 further includes a planarization layer 60, a portion of the planarization layer 60 is disposed between the first adhesive layer 20 and the black matrix layer 106, and another portion of the planarization layer 60 is disposed between the first adhesive layer 20 and the color filter layer 105. Wherein the planarization layer 60 is a transparent organic insulating layer, and the thickness of the planarization layer 60 is 1 micron to 3 microns.
In this embodiment, the planarization layer 60 is disposed between the first adhesive layer 20 and the black matrix layer 106, so that the first adhesive layer 20 and the black matrix layer 106 are disposed at intervals, and thus, in the environmental stability testing process of the display module, chemical reaction between the first adhesive layer 20 and the black matrix layer 106 or gas generated by the black matrix layer 106 is avoided, and the performance of the display module is affected, i.e. the planarization layer 60 is used for further improving the environmental stability of the display module.
Please refer to fig. 3, which is a schematic diagram of a film stack of two different configurations. Fig. 3 (a) shows a first film stack including a first glass substrate 701 and a green resist liquid film 702 stacked in this order; in fig. 3, (B) is a second film laminate including a first glass substrate 701, a green resist liquid film 702, a transparent organic layer 703, and a second glass substrate 704 stacked in this order. The green photoresist liquid film 702 is a green photoresist partially cured under light conditions. The first and second film stacks were post-baked at 90 ℃ for 30 minutes, respectively, so that the green photoresist liquid film 702 was changed from a liquid film to a green photoresist dry film by post-curing, and the first and second film stacks were tested for transmittance of 500 nm to 580 nm visible light and hue shift, respectively, before and after baking. The transmittance of the first film layer laminate and the second film layer laminate for visible light of 500 nm to 580 nm before and after the test and the hue shift are shown in table 1.
TABLE 1
As shown in table 1, the transmittance of the first film laminated structure to 500 nm-580 nm visible light is increased before and after the test, mainly because the water molecules in the green photoresist liquid film 702 in the first film laminated structure can escape under the baking condition, so as to avoid the influence of the water molecules on the transmittance of the green photoresist dry film. The transmittance of the second film stack for 500 nm to 580 nm visible light before the test is greater than that of the second film stack for 500 nm to 580 nm visible light after the test irradiation, mainly because water molecules in the green photoresist liquid film 702 in the second film stack cannot escape due to the blocking effect of the second glass substrate 704 and the first glass substrate 701, resulting in a decrease in transmittance in the green photoresist dry film. In addition, the hue shift amount of the first film laminated structure is far smaller than that of the second film laminated structure, so that the aging degree of the green dry film resist after the test in the first film laminated structure is lower than that in the second film laminated structure.
It should be noted that, based on a large number of experimental findings, the present inventors: after ultraviolet light irradiation and sunlight irradiation, the transmittance of the green photoresist (same as that of the embodiment) and the blue photoresist (same as that of the embodiment) in the display module is reduced, and the transmittance of the green photoresist gradually recovers from the edge of the green photoresist to the middle position of the green photoresist after a period of time. Similarly, the transmittance of the blue photoresist and the red photoresist to visible light is improved by reducing the irradiation of high-energy light to the blue photoresist and the red photoresist.
The above description of the embodiments is only for helping to understand the technical solution of the present application and its core ideas; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A display module, characterized in that the display module comprises:
an organic light emitting diode display layer;
the color filter layer is positioned on the light emitting side of the organic light emitting diode display layer and comprises a plurality of color resistance units with different colors;
the black matrix layer comprises a plurality of openings, and a plurality of color resistance units are arranged in the openings;
the optical filter layer is positioned on one side of the color filter layer and the black matrix layer, which is far away from the organic light-emitting diode display layer, and the transmittance of the optical filter layer to ultraviolet light is smaller than that of the optical filter layer to visible light; and
and the adhesive layer is positioned between the optical filter layer and the color filter layer and between the optical filter layer and the black matrix layer.
2. The display module of claim 1, wherein the optical filter layer comprises a transparent organic layer and an ultraviolet light absorber dispersed in the transparent organic layer.
3. The display module of claim 2, wherein the transparent organic layer is a polyimide layer.
4. The display module of claim 1, wherein the optical filter layer has a thickness of 20 microns to 100 microns.
5. The display module of claim 1, wherein the display module further comprises:
the black matrix layer comprises a plurality of black matrix blocks, and the black matrix blocks are arranged between two adjacent color resistance units with different colors.
6. The display module of claim 1, wherein the display module further comprises:
and one part of the planarization layer is arranged between the adhesive layer and the black matrix layer, and the other part of the planarization layer is arranged between the adhesive layer and the color filter layer.
7. The display module of claim 1, wherein the optical filter layer has a transmittance for visible light of a first predetermined wavelength that is less than a transmittance for visible light of a second predetermined wavelength, the first predetermined wavelength being less than the second predetermined wavelength.
8. The display module of claim 7, wherein the first predetermined wavelength is greater than 380 nanometers and less than 420 nanometers and the second predetermined wavelength is greater than or equal to 420 nanometers.
9. The display module of claim 8, wherein the optical filter layer has a transmittance of less than or equal to 40% for the first predetermined wavelength of visible light, a transmittance of greater than or equal to 90% for the second predetermined wavelength of visible light, and a transmittance of less than or equal to 10% for ultraviolet light.
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| CN110048013A (en) * | 2019-03-04 | 2019-07-23 | 京东方科技集团股份有限公司 | Display substrate, display device and manufacturing method of display substrate |
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| US6068953A (en) * | 1997-11-17 | 2000-05-30 | Ricoh Company, Ltd. | Color filter for liquid crystal display device |
| CN104659066B (en) * | 2015-02-05 | 2018-02-13 | 京东方科技集团股份有限公司 | A kind of display panel and preparation method thereof and display device |
| CN107946480A (en) * | 2017-11-01 | 2018-04-20 | 深圳市华星光电半导体显示技术有限公司 | OLED encapsulation method and OLED encapsulating structures |
| CN110007508A (en) * | 2019-04-30 | 2019-07-12 | 深圳市华星光电技术有限公司 | Color membrane substrates, liquid crystal display panel and liquid crystal display device |
| CN113451364A (en) * | 2020-03-27 | 2021-09-28 | 咸阳彩虹光电科技有限公司 | OLED display structure and display device |
| CN111864092A (en) * | 2020-07-15 | 2020-10-30 | 武汉华星光电半导体显示技术有限公司 | Display device |
| CN111799374B (en) * | 2020-07-17 | 2023-04-25 | 京东方科技集团股份有限公司 | Display panel, preparation method and display device thereof |
| CN216624336U (en) * | 2021-11-16 | 2022-05-27 | 武汉华星光电半导体显示技术有限公司 | Display device |
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| CN110048013A (en) * | 2019-03-04 | 2019-07-23 | 京东方科技集团股份有限公司 | Display substrate, display device and manufacturing method of display substrate |
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