CN113193034A - Display back plate, manufacturing method thereof and display device - Google Patents

Display back plate, manufacturing method thereof and display device Download PDF

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Publication number
CN113193034A
CN113193034A CN202110481427.8A CN202110481427A CN113193034A CN 113193034 A CN113193034 A CN 113193034A CN 202110481427 A CN202110481427 A CN 202110481427A CN 113193034 A CN113193034 A CN 113193034A
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sub
pixel
light
emitting layer
pixel unit
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CN113193034B (en
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朱志坚
卢鹏程
陈祯祐
杨子筠
田元兰
张大成
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BOE Technology Group Co Ltd
Yunnan Chuangshijie Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Yunnan Chuangshijie Optoelectronics Technology Co Ltd
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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
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/1201—Manufacture or treatment
    • 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
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
    • 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]

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention provides a display back plate, a manufacturing method thereof and a display device. The display backplane comprises a substrate and a plurality of pixel units which are periodically arranged, each pixel unit comprises a first sub-pixel for displaying a first primary color, a second sub-pixel for displaying a second primary color, a third sub-pixel for displaying a third primary color and a fourth sub-pixel for displaying a fourth color, and at least one of a first light-emitting layer in the first sub-pixel, a second light-emitting layer in the second sub-pixel and a third light-emitting layer in the third sub-pixel shares the same anode with part of fourth light-emitting layers in the fourth sub-pixels. The utilization rate of light emitted by the light emitting layer in the display back plate is high, the difficulty is low when gamma debugging is carried out, and the display effect is good.

Description

Display back plate, manufacturing method thereof and display device
Technical Field
The invention relates to the technical field of display, in particular to a display back plate, a manufacturing method thereof and a display device.
Background
In the related art, Micro OLED microdisplay is a Micro organic Light emitting diode display device using a single crystal silicon integrated circuit as a back panel and a top-emitting OLED (organic Light Emitted diode) device as a Light source, which has the advantages of small size, Light weight, high contrast, fast response speed, low power consumption, and the like, and is expected to become a next-generation mobile display terminal. However, the Micro OLED Micro-display has a low luminance, which limits its wide application in AR/VR technology.
Thus, the related art of the existing Micro OLED Micro display still needs to be improved.
Disclosure of Invention
The present invention has been completed based on the following findings of the inventors:
currently, Micro OELD microdisplay is implemented by white Light EL (Emitted-Light) plus CF (Color Filter). The color filter realizes the passing of monochromatic red, green or blue light by absorbing light with specific wavelength. Therefore, when the light emitted from the white light EL passes through the color filter, the brightness of the light is greatly reduced, resulting in a low utilization rate of the light emitted from the white light EL.
Based on this, the present invention is directed to solving at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a display backplane with high utilization rate of light emitted from a light emitting layer, low difficulty in gamma adjustment, or good display effect.
In one aspect of the invention, a display backplane is provided. According to an embodiment of the present invention, the display backplane includes a substrate and a plurality of pixel units arranged periodically, each of the pixel units includes a first sub-pixel for displaying a first primary color, a second sub-pixel for displaying a second primary color, a third sub-pixel for displaying a third primary color, and a fourth sub-pixel for displaying a fourth color, and at least one of a first light-emitting layer in the first sub-pixel, a second light-emitting layer in the second sub-pixel, and a third light-emitting layer in the third sub-pixel shares the same anode with a part of fourth light-emitting layers in the fourth sub-pixel. The utilization rate of light emitted by the light emitting layer in the display back plate is high, the difficulty is low when gamma debugging is carried out, and the display effect is good.
According to an embodiment of the present invention, each of the pixel units includes at least three sub-pixel units, each of the sub-pixel units having therein: any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer; and a part of the fourth light emitting layer.
According to the embodiment of the present invention, the sum of the luminance of the first sub-pixel, the luminance of the second sub-pixel and the luminance of the third sub-pixel is defined as a first luminance; the luminance of the fourth sub-pixel is a second luminance, and a ratio of the first luminance to the second luminance is constant.
According to an embodiment of the present invention, a ratio of the first luminance to the second luminance is (0.5 to 2): 1.
according to an embodiment of the present invention, a ratio of the first luminance and the second luminance is 1: 1.
according to an embodiment of the present invention, a color filter is further provided on a side of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer away from the substrate, and in each of the sub-pixel units, a relationship between an area of any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer and an area of a part of the fourth light-emitting layer satisfies: sa×τ＝SbWherein S isaAn area of any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer in each of the sub-pixel units; sbThe area of part of the fourth light-emitting layer in each sub-pixel unit; τ is a light transmittance of the color filter in the sub-pixel unit.
According to an embodiment of the present invention, the fourth light emitting layer is divided into a first sub light emitting layer, a second sub light emitting layer and a third sub light emitting layer, the first sub light emitting layer and the first light emitting layer are located in a same sub pixel unit and share a same anode, the second sub light emitting layer and the second light emitting layer are located in a same sub pixel unit and share a same anode, and the third sub light emitting layer and the third light emitting layer are located in a same sub pixel unit and share a same anode.
According to an embodiment of the present invention, each of the pixel units includes 12 sub-pixel units, the shape of the sub-pixel unit is a hexagon, the plurality of light emitting layers in each of the pixel units includes 4 first light emitting layers, 4 second light emitting layers, 4 third light emitting layers, and 4 fourth light emitting layers, 12 of the sub-pixel units in each of the pixel units are arranged in a hexagonal close arrangement, the hexagonal close arrangement has a first horizontal line and a second horizontal line, the first horizontal line and the second horizontal line have 6 sub-pixel units thereon, respectively, the sub-pixel unit where the first sub-light emitting layer and the first light emitting layer are located is defined as a first sub-pixel unit, the sub-pixel unit where the second sub-light emitting layer and the second light emitting layer are located is defined as a second sub-pixel unit, and the sub-pixel unit where the third sub-light emitting layer and the third light emitting layer are located is defined as a third sub-pixel unit, wherein the 1 st sub-pixel unit in the first horizontal row, the 4 th sub-pixel unit in the first horizontal row, the 2 nd sub-pixel unit in the second horizontal row and the 5 th sub-pixel unit in the second horizontal row are the first sub-pixel unit; the 2 nd sub-pixel unit in the first horizontal row, the 5 th sub-pixel unit in the first horizontal row, the 3 rd sub-pixel unit in the second horizontal row and the 6 th sub-pixel unit in the second horizontal row are the second sub-pixel unit; the 3 rd sub-pixel unit in the first horizontal line, the 6 th sub-pixel unit in the first horizontal line, the 1 st sub-pixel unit in the second horizontal line and the 4 th sub-pixel unit in the second horizontal line are the third sub-pixel unit.
According to the embodiment of the invention, a planarization layer is further arranged on one side of the fourth light emitting layer away from the substrate, the planarization layer and the color filter are arranged in the same layer, and the thicknesses of the planarization layer and the color filter are the same.
According to an embodiment of the invention, the material of the planarization layer comprises a photo-curable material.
In another aspect of the invention, a method of making the display backplane described above is provided. According to an embodiment of the invention, the method comprises: forming a plurality of pixel units arranged periodically on the substrate, wherein each pixel unit comprises the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel, and at least one of the first light-emitting layer in the first sub-pixel, the second light-emitting layer in the second sub-pixel and the third light-emitting layer in the third sub-pixel shares the same anode with a part of the fourth light-emitting layer in the fourth sub-pixel. The method is simple and convenient to operate, easy to realize and easy for industrial production, and the display back plate can be effectively manufactured.
According to an embodiment of the present invention, after forming a plurality of the pixel units arranged periodically on the substrate base plate, the method further includes: and forming a planarization layer on one side of the fourth light-emitting layer far away from the substrate.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes the display back plate described above. The display device has the advantages of high utilization rate of light emitted by the display device, low difficulty in gamma debugging, good display effect, and all the characteristics and advantages of the display back plate, and is not described in detail herein.
Drawings
Fig. 1 is a schematic plan view of a display backplane according to an embodiment of the present invention.
Fig. 2 is a schematic plan view of a display backplane according to another embodiment of the present invention.
FIG. 3 is a schematic diagram illustrating a display manner of the display back plate in the embodiment of FIG. 2.
FIG. 4 is a schematic diagram illustrating another display mode of the display back plate in the embodiment of FIG. 2.
FIG. 5 is a schematic diagram illustrating another display manner of the display back plate in the embodiment of FIG. 2.
FIG. 6 is a schematic cross-sectional view of a display backplane according to an embodiment of the present invention.
FIG. 7 is a flow chart illustrating a method for fabricating a display backplane according to an embodiment of the present invention.
Reference numerals:
11: first sub-pixel 22: second sub-pixel 33: third sub-pixel 44: fourth sub-pixels R1, R2, R3, R4: first light-emitting layer G1, G2, G3, G4: second light-emitting layers B1, B2, B3, B4: third light-emitting layer w: part of the fourth light emitting layer 100: first planarizing layer 200: second planarization layer 300: the planarization layer 400: color filter 500: the microlens 600: insulating layer
Detailed Description
The following describes embodiments of the present invention in detail. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
In one aspect of the invention, a display backplane is provided. According to an embodiment of the present invention, the display backplane includes a substrate and a plurality of pixel units arranged periodically, each of the pixel units includes a first sub-pixel for displaying a first primary color, a second sub-pixel for displaying a second primary color, a third sub-pixel for displaying a third primary color, and a fourth sub-pixel for displaying a fourth color, and at least one of a first light-emitting layer in the first sub-pixel, a second light-emitting layer in the second sub-pixel, and a third light-emitting layer in the third sub-pixel shares the same anode with a part of fourth light-emitting layers in the fourth sub-pixel. In the display back plate, at least one of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer and part of the fourth light-emitting layer share the same anode, so that on one hand, a fourth sub-pixel where the fourth light-emitting layer is located is used for displaying a fourth color, and a color filter is not required to be arranged on one side, far away from the substrate, of the fourth light-emitting layer, so that the utilization rate of light emitted by the light-emitting layers in the display back plate is high; on the other hand, because the gamma debugging is performed on the display backboard, the voltage applied to the luminescent layer is debugged, so that when the gamma debugging is performed on the display backboard through the sharing of the anode, the gamma debugging can be performed on at least one of the first sub-pixel where the first luminescent layer is located, the second sub-pixel where the second luminescent layer is located and the third sub-pixel where the third luminescent layer is located, namely, the gamma debugging can be performed on part of the fourth sub-pixels where the fourth luminescent layer is located at the same time, the difficulty in performing the gamma debugging on the display backboard is lower, the effect of the gamma debugging is better, and the display effect of the display backboard is better.
According to the embodiment of the present invention, it can be understood that the specific material, thickness, and the like of the substrate are not particularly limited, and as long as the requirements are met, those skilled in the art can flexibly select the substrate according to actual needs, and redundant description is not repeated herein.
According to the embodiment of the present invention, it should be noted that the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer described herein refer to only light emitting layers for displaying different colors, and the materials, properties, and the like of the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer are not limited. That is, the materials, properties, and the like of the first light-emitting layer, the second light-emitting layer, the third light-emitting layer, and the fourth light-emitting layer described herein may be the same or different. It can be understood that when the materials, properties, and the like of the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer are completely the same, a color filter capable of absorbing light with a specific wavelength may be disposed on a side of the first light emitting layer, the second light emitting layer, and the third light emitting layer away from the substrate, so that a first sub-pixel where the first light emitting layer is located is used for displaying a first primary color, a second sub-pixel where the second light emitting layer is located is used for displaying a second primary color, and a third sub-pixel where the third light emitting layer is located is used for displaying a third primary color; and a color filter is not arranged on one side of the fourth light-emitting layer away from the substrate, so that the fourth sub-pixel where the fourth light-emitting layer is located is used for displaying the color of light emitted by the fourth light-emitting layer, namely, the fourth color.
According to the embodiments of the present invention, it should be noted that, as described above, the materials, properties, and the like of the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer described herein may be the same or different, and when the materials, properties, and the like of the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer are completely the same, the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer may be continuously disposed in the display backplane.
According to the embodiments of the present invention, it is understood that, when the materials, properties, and the like of the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer are completely the same, the light emitted by the first light emitting layer, the second light emitting layer, the third light emitting layer, and the fourth light emitting layer may all be white light, and the sides of the first light emitting layer, the second light emitting layer, and the third light emitting layer, which are away from the substrate, are all provided with color filters capable of absorbing specific wavelengths, then in some embodiments of the present invention, the first sub-pixel where the first light emitting layer is located may be used for displaying red, the second sub-pixel where the second light emitting layer is located may be used for displaying green, the third sub-pixel where the third light emitting layer is located may be used for displaying blue, and the fourth sub-pixel where the fourth light emitting layer is.
According to an embodiment of the present invention, further, referring to fig. 1, in the display backplane of the present invention, each of the pixel units may include at least three sub-pixel units, and each of the sub-pixel units may have: any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer; and a part of the fourth light emitting layer (it should be noted that, in this document, the first sub-pixel 11 where the first light emitting layer R1 is located is used for displaying red, the second sub-pixel 22 where the second light emitting layer G1 is located is used for displaying green, the third sub-pixel 33 where the third light emitting layer B1 is located is used for displaying blue, and the fourth sub-pixel 44 where the fourth light emitting layer w is located is used for displaying white are taken as examples for description, but a person skilled in the art can understand that the first sub-pixel 11, the second sub-pixel 22, the third sub-pixel 33, and the fourth sub-pixel 44 may also be used for displaying other colors, and details are not repeated herein). Through the above arrangement, when the display backplane is subjected to gamma debugging, when the first subpixel 11 where the first luminescent layer R1 is located, the second subpixel 22 where the second luminescent layer G1 is located, and the third subpixel 33 where the third luminescent layer B1 is located are subjected to gamma debugging, that is, the fourth subpixel 44 where the whole fourth luminescent layer w is located can be subjected to gamma debugging at the same time, so that the difficulty in gamma debugging of the display backplane is lower, and meanwhile, the gamma debugging effect is better, and further, the display effect of the display backplane is better.
Further, after extensive and intensive studies and experimental verification, the inventors of the present invention found that, in the related art, the light emitted from the fourth light-emitting layer in the fourth sub-pixel of the Micro OLED Micro display is not strictly white light, and the color coordinate thereof is deviated from (0.31, 0.33), and in general, the color coordinate thereof is (0.28 ± 0.02, 0.39 ± 0.02); in addition, gamma adjustment of Micro-OLED Micro-display is generally complicated, the white light emitted from the fourth light emitting layer in the fourth sub-pixel deviates from the white point, and it can use 4 Digital gammas to perform gamma adjustment, so as to ensure the white balance at each gray level. However, after the gamma adjustment is performed by using 4 Digital gammas to make the light emitted by the fourth light emitting layer not deviate from the white point, the brightness of the fourth sub-pixel is determined, so that the determined brightness of the fourth sub-pixel is usually not equal to the optimal condition of the RGBW brightness algorithm in Micro OLED Micro display, and the gamma adjustment difficulty is high, which results in a poor display effect of the display backplane.
According to the embodiment of the present invention, based on this, in the present invention, the inventors define the sum of the luminance of the first sub-pixel 11, the luminance of the second sub-pixel 22, and the luminance of the third sub-pixel 33 as a first luminance; the luminance of the fourth sub-pixel 44 is a second luminance, wherein a ratio of the first luminance to the second luminance is constant. By such an arrangement, the luminance of the first sub-pixel 11, the luminance of the second sub-pixel 22, the luminance of the third sub-pixel 33, and the luminance of the fourth sub-pixel 44 in the invention can be equal to the RGBW luminance in Micro OLED Micro display, so that the display effect of the display back plate is better.
According to the embodiments of the present invention, after a lot of thorough examination and experimental verification, the inventors found that when the ratio of the first luminance to the second luminance is (0.5-2): 1, specifically, a ratio of the first luminance to the second luminance may be 0.5: 1. 0.6: 1. 0.7: 1. 0.8: 1. 0.9: 1. 1: 1. 1.1: 1. 1.2: 1. 1.3: 1. 1.4: 1. 1.5: 1. 1.6: 1. 1.7: 1. 1.8: 1. 1.9: 1 or 2: 1, the brightness ratio of RGBW brightness in the display backboard is better, so that the display effect of the display backboard of the invention can be further improved; further, when the ratio of the first luminance to the second luminance is 1: 1, the luminance of the first sub-pixel 11, the luminance of the second sub-pixel 22, the luminance of the third sub-pixel 33, and the luminance of the fourth sub-pixel 44 in the present invention can be equal to the RGBW luminance in Micro OLED Micro display, so that the display effect of the display backplane can be optimized.
More specifically, in some embodiments of the present invention, referring to fig. 1, a color filter (not shown in the figure) is further disposed on a side of the first light emitting layer R1, the second light emitting layer G1, and the third light emitting layer B1 away from the substrate (not shown in the figure), in each sub-pixel unit (for example, in fig. 1, 3 sub-pixel units coexist, in the figures herein, each hexagon represents one sub-pixel unit, and details are not repeated in the following description), a relationship between an area of any one of the first light emitting layer R1, the second light emitting layer G1, and the third light emitting layer B1, and an area of a part of the fourth light emitting layer w, is satisfied: sa×τ＝SbWherein S isaIs at each timeAn area of any one of the first light-emitting layer R1, the second light-emitting layer G1, and the third light-emitting layer B1 in each of the sub-pixel units; sbThe area of part of the fourth light-emitting layer w in each sub-pixel unit; τ is a light transmittance of the color filter in the sub-pixel unit. Through the above arrangement, the luminance of the first sub-pixel 11, the luminance of the second sub-pixel 22, the luminance of the third sub-pixel 33, and the luminance of the fourth sub-pixel 44 in the invention can be equal to the RGBW luminance in Micro OLED Micro display, and thus the display effect of the display back panel can be optimized.
According to an embodiment of the present invention, in fig. 1 described previously, the fourth light emitting layer is divided into three portions, which share the same anode with the first light emitting layer R1, the second light emitting layer G1, and the third light emitting layer B1, respectively. According to the luminance calculation formula in Micro OLED Micro-display, the luminance of the first sub-pixel 11, the luminance of the second sub-pixel 22, and the luminance of the third sub-pixel 33 are respectively: s11×L11×τ1/SGeneral assembly、S22×L22×τ2/SGeneral assembly、S33×L33×τ3/SGeneral assembly，S11、S22、S33Areas of the first light-emitting layer R1, the second light-emitting layer G1, and the third light-emitting layer B1, respectively; l is11、L22、L33The total brightness of the white light emitted from the light-emitting layer in the sub-pixel unit is L11I.e. may be the total luminance, L, of the white light emitted by the first light-emitting layer R1 and part of the fourth light-emitting layer w in the sub-pixel unit22I.e. the total brightness, L, of the white light emitted by the second light-emitting layer G1 and the portion of the fourth light-emitting layer w in the sub-pixel unit33I.e., the total brightness of the white light emitted from the third light-emitting layer B1 and a portion of the fourth light-emitting layer w in the sub-pixel unit; tau is1、τ2And τ3The transmittance of the color filter in each of the three sub-pixel units shown in FIG. 1, wherein τ1Sub-pixel unit corresponding to the left side, τ2Corresponding to the middle sub-pixel unit, tau3The sub-pixel unit corresponding to the right side; sGeneral assemblyIs the total area of the sub-pixel cell (i.e. the total area of one hexagon). The luminances of the fourth light-emitting layer w in which the first light-emitting layer R1, the second light-emitting layer G1, and the third light-emitting layer B1 share the same anode are: s144×L11/SGeneral assembly、S244×L22/SGeneral assembly、S344×L33/SGeneral assemblyWherein S is144、S244、S344The area of a portion of the fourth light-emitting layer w sharing the same anode as the first light-emitting layer R1, the area of a portion of the fourth light-emitting layer w sharing the same anode as the second light-emitting layer G1, and the area of a portion of the fourth light-emitting layer w sharing the same anode as the third light-emitting layer B1, respectively.
According to the embodiment of the present invention, according to the algorithm optimal condition of the RGBW luminance, that is, the ratio of the first luminance to the second luminance is 1: 1, comprising:
(S11×L11×τ1+S22×L22×τ2+S33×L33×τ3)/Sgeneral assembly＝(S144×L11+S244×L22+S344×L33)/SGeneral assembly；
It will be appreciated that the gray levels are intended to be different (i.e., different L's)11、L22And L33) If both the above-mentioned formulas are satisfied, L is required11、L22And L33The preceding coefficients are all equal, i.e.: s11×τ1＝S144，S22×τ2＝S244，S33×τ3＝S344It can be understood that S11、S22、S33I.e. in different sub-pixel units, S as described abovea；S144、S244、S344I.e. in different sub-pixel units, S as described aboveb. Therefore, through the arrangement mode, the display back plate is provided withThe areas of the first sub-pixel 11, the second sub-pixel 22, the third sub-pixel 33 and the fourth sub-pixel 44 are set to be appropriate, so that the optimal conditions of the algorithm that the brightness of the first sub-pixel 11, the brightness of the second sub-pixel 22, the brightness of the third sub-pixel 33 and the brightness of the fourth sub-pixel 44 are equal to the RGBW brightness in Micro OLED Micro display can be realized, and the display effect of the display back panel can be optimal; meanwhile, it can only adopt 3 Digital gammas to do gamma debugging, also can only adjust for 3 color coordinates under each gray scale condition, that is, the color coordinate (X) of the first sub-pixel 11 mixed with quantitative white lightR、YR) Color coordinates (X) of the second sub-pixel 22 mixed with quantitative white lightG、YG) And the color coordinate (X) of the third sub-pixel 33 mixed with quantitative white lightB、YB) (ii) a In addition, the area of the fourth sub-pixel 44 in each sub-pixel unit is determined by the transmittance τ of the color filter in the sub-pixel unit, so that the fourth sub-pixels 44 are uniformly distributed in the whole pixel arrangement of the display backplane, and the display effect is further improved.
According to an embodiment of the present invention, further, referring to fig. 1, a specific arrangement manner of the fourth light emitting layer in the present invention may be that the fourth light emitting layer is divided into a first sub-light emitting layer, a second sub-light emitting layer and a third sub-light emitting layer (the first sub-light emitting layer, the second sub-light emitting layer and the third sub-light emitting layer are all part of the fourth light emitting layer w), the first sub-light emitting layer and the first light emitting layer R1 are located in the same sub-pixel unit and share the same anode, the second sub-light emitting layer and the second light emitting layer G1 are located in the same sub-pixel unit and share the same anode, and the third sub-light emitting layer and the third light emitting layer B1 are located in the same sub-pixel unit and share the same anode. Therefore, according to the above, the utilization rate of light emitted by the light emitting layer in the display back plate is high, the difficulty in gamma debugging is low, and the display effect is good.
In a more specific embodiment of the present invention, referring to fig. 2, each of the pixel units may include 12 sub-pixel units, the sub-pixel units have a hexagonal shape, and the plurality of light emitting layers in each of the pixel units include 4 first light emitting layers R1, R2, R3, and R4; 4 of the second light emitting layers G1, G2, G3, and G4; 4 of the third light emitting layers B1, B2, B3 and B4; and 4 of the fourth light emitting layers (each of the fourth light emitting layers is divided into 3 partial fourth light emitting layers w, namely, a first sub light emitting layer, a second sub light emitting layer and a third sub light emitting layer), 12 of the sub pixel units in each of the pixel units are arranged in a hexagonal close arrangement, the hexagonal close arrangement has a first horizontal row and a second horizontal row, 6 of the sub pixel units are respectively arranged on the first horizontal row and the second horizontal row, the sub pixel units defining the first sub light emitting layer and the first light emitting layers R1, R2, R3 and R4 are first sub pixel units, the sub pixel units defining the second sub light emitting layers G1, G2, G3 and G4 are second sub pixel units, the sub pixel units defining the third sub light emitting layers B1, B2, B3 and B4 are third sub pixel units, wherein the 1 st sub-pixel unit in the first horizontal row, the 4 th sub-pixel unit in the first horizontal row, the 2 nd sub-pixel unit in the second horizontal row and the 5 th sub-pixel unit in the second horizontal row are the first sub-pixel unit; the 2 nd sub-pixel unit in the first horizontal row, the 5 th sub-pixel unit in the first horizontal row, the 3 rd sub-pixel unit in the second horizontal row and the 6 th sub-pixel unit in the second horizontal row are the second sub-pixel unit; the 3 rd sub-pixel unit in the first horizontal line, the 6 th sub-pixel unit in the first horizontal line, the 1 st sub-pixel unit in the second horizontal line and the 4 th sub-pixel unit in the second horizontal line are the third sub-pixel unit. Therefore, according to the display back plate, the utilization rate of light emitted by the light emitting layer in the display back plate is higher, the difficulty is lower when gamma debugging is carried out, and the display effect is better.
According to the embodiment of the present invention, in the foregoing embodiments, the display manners of the display back plate for the black dot, the horizontal black and white line, and the vertical black and white line are respectively shown in fig. 3, fig. 4, and fig. 5, it can be understood that the display of the remaining more complicated figures can be performed based on the display manners of the display back plate for the black dot, the horizontal black and white line, and the vertical black and white line, and are not described in detail herein.
In other embodiments of the present invention, referring to fig. 6, a planarization layer 300 is further disposed on a side of the fourth light emitting layer (not shown) away from the substrate (not shown), the planarization layer 300 is disposed in the same layer as the color filter 400, and the planarization layer 300 and the color filter 400 have the same thickness. Since the fourth sub-pixel is not required to be provided with a color filter on the side away from the substrate, but the second planarization layer 200 in the display backplane has a smaller thickness and the color filter has a larger thickness, when the pixel arrangement manner described above is adopted, the second planarization layer 200 cannot perform a good planarization function, and further, by providing the planarization layer 300, the fourth sub-pixel can be made equal in height to the first sub-pixel, the second sub-pixel and the third sub-pixel, so that each part of the microlenses 500 in the display backplane is equal in height, and the display effect of the display backplane is better.
According to the embodiment of the present invention, it can be understood that, in addition to the foregoing structures, the structures, materials, and arrangements of the first planarization layer 100, the microlenses 500, and the insulating layer 600 shown in fig. 6 may be the same as those of the display backplane in the related art, and the structures, materials, and arrangements of the first planarization layer 100, the microlenses 500, and the insulating layer 600 are not described in detail herein. Therefore, the structure is simple and easy to realize.
According to an embodiment of the present invention, the material of the planarization layer is not particularly limited, and in some embodiments of the present invention, the material of the planarization layer may include a photo-curable material. Therefore, the material source is wide and easy to obtain, the cost is low, the resolution and the flatness are both suitable, the same material can be used as the material of the micro lens 500, and the micro lens is easy to realize and is easy to realize in industrial production.
According to the embodiments of the present invention, it can be understood that, in the display backplane according to the present invention, the structures and components that are not mentioned above, such as the thin film transistors, the package structures, and the like, may be the same as the structures or components of the display backplane that are conventional in the related art, and are not described in detail herein.
In another aspect of the invention, a method of making the display backplane described above is provided. According to an embodiment of the invention, the method may specifically comprise the steps of:
s100: forming a plurality of pixel units arranged periodically on the substrate, wherein each pixel unit comprises the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel, and at least one of the first light-emitting layer in the first sub-pixel, the second light-emitting layer in the second sub-pixel and the third light-emitting layer in the third sub-pixel shares the same anode with a part of the fourth light-emitting layer in the fourth sub-pixel.
According to the embodiment of the present invention, it can be understood that the process for forming the plurality of pixel units arranged in the periodic arrangement on the substrate base plate may be a specific process for conventionally forming the plurality of pixel units arranged in the periodic arrangement on the substrate base plate in the related art, and specific process steps, conditions and parameters thereof may be steps, conditions and parameters for conventionally forming the plurality of pixel units arranged in the periodic arrangement on the substrate base plate, and therefore, redundant description thereof is omitted. Therefore, the manufacturing process is simple and convenient, easy to realize and easy for industrial production, and the display back plate can be effectively manufactured.
According to an embodiment of the present invention, further, referring to fig. 7, after forming a plurality of the pixel units arranged periodically on the substrate base plate, the method may further include the steps of:
s200: and forming a planarization layer on one side of the fourth light-emitting layer far away from the substrate.
According to the embodiment of the present invention, it can be understood that the process for forming the planarization layer on the side of the fourth light emitting layer away from the substrate may be a specific process for conventionally forming the planarization layer on the side of the light emitting layer away from the substrate in the related art, and specific process steps, conditions and parameters of the process may be steps, conditions and parameters for conventionally forming the planarization layer on the side of the light emitting layer away from the substrate, and therefore, redundant description is not repeated here. Therefore, the preparation process is simple and convenient, is easy to realize and is easy for industrial production.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes the display back plate described above. The display device has the advantages of high utilization rate of light emitted by the display device, low difficulty in gamma debugging, good display effect, and all the characteristics and advantages of the display back plate, and is not described in detail herein.
According to the embodiment of the present invention, the display device further includes other necessary structures and components besides the display back plate described above, and those skilled in the art can supplement and design the display device according to the specific kind and use requirements of the display device, and therefore, redundant description is not repeated herein.
According to an embodiment of the present invention, the specific kind of the display device is not particularly limited, and includes, for example, but not limited to, a mobile phone, a tablet computer, a wearable device, a game machine, a television, or a vehicle-mounted display, and the like.
According to an embodiment of the present invention, the display device may be a Micro OLED Micro display device.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (13)

1. A display backplane comprising a substrate and a plurality of periodically arranged pixel cells, each of said pixel cells comprising a first sub-pixel for displaying a first primary color, a second sub-pixel for displaying a second primary color, a third sub-pixel for displaying a third primary color, and a fourth sub-pixel for displaying a fourth color,
at least one of the first light-emitting layer in the first sub-pixel, the second light-emitting layer in the second sub-pixel and the third light-emitting layer in the third sub-pixel shares the same anode with part of the fourth light-emitting layers in the fourth sub-pixel.
2. A display backplane according to claim 1, wherein each of said pixel cells comprises at least three sub-pixel cells, each of said sub-pixel cells having therein:
any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer; and
and part of the fourth light-emitting layer.
3. The display backplane of claim 2, wherein a sum of the luminance of the first sub-pixel, the luminance of the second sub-pixel, and the luminance of the third sub-pixel is defined as a first luminance; the luminance of the fourth sub-pixel is a second luminance, and a ratio of the first luminance to the second luminance is constant.
4. The display backplane of claim 3, wherein a ratio of the first brightness to the second brightness is (0.5-2): 1.
5. a display backplane according to claim 4, wherein the ratio of the first brightness to the second brightness is 1: 1.
6. the display backplane according to claim 5, wherein a color filter is further provided on a side of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer away from the substrate, and in each of the sub-pixel units, a relationship between an area of any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer and an area of a part of the fourth light-emitting layer satisfies:
Sa×τ＝Sb，
wherein S isaAn area of any one of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer in each of the sub-pixel units; sbThe area of part of the fourth light-emitting layer in each sub-pixel unit; τ is a light transmittance of the color filter in the sub-pixel unit.
7. The display backplane of claim 2, wherein the fourth light-emitting layer is divided into a first sub-light-emitting layer, a second sub-light-emitting layer and a third sub-light-emitting layer, the first sub-light-emitting layer and the first light-emitting layer are located in the same sub-pixel unit and share the same anode, the second sub-light-emitting layer and the second light-emitting layer are located in the same sub-pixel unit and share the same anode, and the third sub-light-emitting layer and the third light-emitting layer are located in the same sub-pixel unit and share the same anode.
8. A display backplane according to claim 7, wherein each of the pixel units comprises 12 sub-pixel units, the sub-pixel units are hexagonal in shape, the plurality of light-emitting layers in each of the pixel units comprises 4 of the first light-emitting layers, 4 of the second light-emitting layers, 4 of the third light-emitting layers, and 4 of the fourth light-emitting layers, the 12 sub-pixel units in each of the pixel units are in a hexagonal close arrangement having a first horizontal row and a second horizontal row, and the first horizontal row and the second horizontal row have 6 of the sub-pixel units thereon,
defining the sub-pixel unit where the first sub-light-emitting layer and the first light-emitting layer are located as a first sub-pixel unit, the sub-pixel unit where the second sub-light-emitting layer and the second light-emitting layer are located as a second sub-pixel unit, the sub-pixel unit where the third sub-light-emitting layer and the third light-emitting layer are located as a third sub-pixel unit,
wherein the 1 st sub-pixel unit in the first horizontal row, the 4 th sub-pixel unit in the first horizontal row, the 2 nd sub-pixel unit in the second horizontal row and the 5 th sub-pixel unit in the second horizontal row are the first sub-pixel unit; the 2 nd sub-pixel unit in the first horizontal row, the 5 th sub-pixel unit in the first horizontal row, the 3 rd sub-pixel unit in the second horizontal row and the 6 th sub-pixel unit in the second horizontal row are the second sub-pixel unit; the 3 rd sub-pixel unit in the first horizontal line, the 6 th sub-pixel unit in the first horizontal line, the 1 st sub-pixel unit in the second horizontal line and the 4 th sub-pixel unit in the second horizontal line are the third sub-pixel unit.
9. The display backplane of claim 6, wherein a planarization layer is further disposed on a side of the fourth light-emitting layer away from the substrate, the planarization layer is disposed on the same layer as the color filter, and the planarization layer and the color filter have the same thickness.
10. The display backplane of claim 9, wherein the material of the planarization layer comprises a photo-curable material.
11. A method of making the display backplane of any of claims 1-10, comprising:
forming a plurality of the pixel units arranged periodically on the base substrate, each of the pixel units including the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel,
wherein at least one of the first light-emitting layer in the first sub-pixel, the second light-emitting layer in the second sub-pixel, and the third light-emitting layer in the third sub-pixel shares the same anode with a portion of the fourth light-emitting layer in the fourth sub-pixel.
12. The method of claim 11, further comprising, after forming a plurality of the pixel cells arranged periodically on the substrate base plate:
and forming a planarization layer on one side of the fourth light-emitting layer far away from the substrate.
13. A display device comprising the display back sheet according to any one of claims 1 to 10.
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Publication number Priority date Publication date Assignee Title
WO2017082173A1 (en) * 2015-11-13 2017-05-18 住友化学株式会社 Method for manufacturing organic el device, and organic el device
CN109904196A (en) * 2019-01-30 2019-06-18 武汉华星光电半导体显示技术有限公司 Display panel and preparation method thereof, electronic device
CN111668383A (en) * 2020-06-22 2020-09-15 京东方科技集团股份有限公司 Display panel and display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017082173A1 (en) * 2015-11-13 2017-05-18 住友化学株式会社 Method for manufacturing organic el device, and organic el device
CN109904196A (en) * 2019-01-30 2019-06-18 武汉华星光电半导体显示技术有限公司 Display panel and preparation method thereof, electronic device
CN111668383A (en) * 2020-06-22 2020-09-15 京东方科技集团股份有限公司 Display panel and display device

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