CN111933670A - Display substrate, preparation method thereof and display device - Google Patents
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- 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
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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
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- H10K59/1201—Manufacture or treatment
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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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- 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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- H—ELECTRICITY
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Abstract
A display substrate, a preparation method thereof and a display device are provided. The display substrate includes a plurality of pixels, each pixel including a red sub-pixel, a green sub-pixel, and a blue sub-pixel, the red, green, and blue sub-pixels including: the pixel definition functional layer is arranged on one side of the first electrode, which is far away from the backboard, and the pixel definition functional layer, the light emitting layer and the second electrode are sequentially arranged on the backboard; the attenuation speed of the pixel definition functional layer of the red sub-pixel and the green sub-pixel to light is larger than that of the pixel definition functional layer of the blue sub-pixel to light. According to the scheme provided by the embodiment, the unbalanced caused by different attenuation speeds under a large visual angle is compensated by setting the pixel definition function layers with different attenuation speeds, and the problem of color cast and yellowing under the large visual angle is solved.
Description
Technical Field
Embodiments of the present disclosure relate to, but not limited to, display technologies, and particularly to a display substrate, a method for manufacturing the display substrate, and a display device.
Background
An Organic Light Emitting Diode (OLED) is an active Light Emitting display device, and has the advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, fast response speed, bright color, thinness, flexibility, and the like. With the continuous development of display technology, the OLED technology is applied to various display devices more and more, and becomes the mainstream of the current market. However, the OLED display panel has a problem of color shift and yellowing under a large viewing angle.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the application provides a display substrate, a preparation method thereof and a display device, and solves the problem that a large viewing angle color is prone to yellowing.
In one aspect, an embodiment of the present application provides a display substrate, where the display substrate includes a plurality of pixels, each pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the red sub-pixel, the green sub-pixel, and the blue sub-pixel include: the pixel definition functional layer is arranged on one side of the first electrode, which is far away from the backboard, and the pixel definition functional layer, the light emitting layer and the second electrode are sequentially arranged on the backboard; the attenuation speed of the pixel definition functional layer of the red sub-pixel and the green sub-pixel to light is larger than that of the pixel definition functional layer of the blue sub-pixel to light.
In an exemplary embodiment, the pixel definition function layer includes a pixel definition layer and a support layer arranged in sequence from the direction close to the backplane to the direction far from the backplane, and the pixel definition layer of the red sub-pixel and the pixel definition layer of the green sub-pixel attenuate light at a speed higher than that of the pixel definition layer of the blue sub-pixel.
In an exemplary embodiment, the pixel definition function layer of the red and green sub-pixels includes a pixel definition layer, an attenuation layer and a support layer, which are sequentially arranged from the direction close to the back plate to the direction far from the back plate, and the attenuation layer covers the pixel definition layer; the pixel definition function layer of the blue sub-pixel comprises a pixel definition layer and a supporting layer which are sequentially arranged;
or, from the direction close to the backplane to the direction far away from the backplane, the pixel definition function layer of the red sub-pixel and the pixel definition function layer of the green sub-pixel comprise a pixel definition layer, a support layer and an attenuation layer which are sequentially arranged, and the attenuation layer covers the pixel definition layer and the support layer; the pixel definition function layer of the blue sub-pixel comprises a pixel definition layer and a supporting layer which are sequentially arranged;
wherein the attenuating layer is configured to attenuate light.
In an exemplary embodiment, the pixel defining layers of the red and green sub-pixels are made of a material doped with a light-sensitive color-changing material, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of a material not doped with a light-sensitive color-changing material;
or, the pixel defining layer and the supporting layer of the red sub-pixel and the green sub-pixel are made of materials doped with photosensitive color-changing materials, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of materials not doped with photosensitive color-changing materials.
In an exemplary embodiment, the material of the attenuating layer includes a light-sensitive color-changing material.
In an exemplary embodiment, the light-sensitive color-changing material includes at least one of: spiropyran compounds and silver halide compounds.
In an exemplary embodiment, the pixel defining layer is provided with a pixel opening region, the light emitting layer is provided in the pixel opening region, and a cross-sectional shape of the pixel opening region on a plane perpendicular to the backplane includes: trapezoidal, inverted trapezoidal, rectangular.
In an exemplary embodiment, the display substrate is a top-emitting device including a microcavity structure.
In another aspect, an embodiment of the present application provides a display device, including the display substrate described above.
In another aspect, an embodiment of the present application provides a method for manufacturing a display substrate, where the display substrate includes a plurality of pixels, and the pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the method includes:
forming a back plate;
forming a first electrode on the back plate;
sequentially forming a pixel definition functional layer, a light emitting layer and a second electrode on one side of the first electrode, which is far away from the backboard; the attenuation speed of the pixel definition functional layer of the red sub-pixel and the pixel definition functional layer of the green sub-pixel to light is larger than that of the pixel definition functional layer of the blue sub-pixel to light.
In an exemplary embodiment, the forming the pixel definition function layer includes:
forming a pixel defining layer of red sub-pixels and green sub-pixels on one side of the first electrode, which is far away from the backboard;
forming a pixel definition layer of a blue sub-pixel on one side of the first electrode, which is far away from the backboard; wherein the light attenuation speed of the pixel definition layer of the red sub-pixel and the light attenuation speed of the pixel definition layer of the green sub-pixel are greater than the light attenuation speed of the pixel definition layer of the blue sub-pixel;
a support layer is formed on the pixel defining layer.
In an exemplary embodiment, the forming the pixel definition function layer includes:
forming a pixel defining layer of each sub-pixel on one side of the first electrode away from the back plate;
forming an attenuating layer covering the pixel defining layer of the red sub-pixel and the pixel defining layer of the blue sub-pixel on the pixel defining layer;
forming a support layer on the attenuating layer;
alternatively, the first and second electrodes may be,
forming a pixel defining layer of each sub-pixel on one side of the first electrode away from the back plate;
forming a support layer on the pixel defining layer;
forming an attenuating layer on the pixel defining layer and the supporting layer, the attenuating layer covering the pixel defining layer and the supporting layer of the red sub-pixel, and the pixel defining layer and the supporting layer covering the green sub-pixel;
wherein the attenuating layer is configured to attenuate light.
In an exemplary embodiment, the pixel defining layers of the red and green sub-pixels are made of a material doped with a light-sensitive color-changing material, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of a material not doped with a light-sensitive color-changing material;
or, the pixel defining layer and the supporting layer of the red sub-pixel and the green sub-pixel are made of materials doped with photosensitive color-changing materials, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of materials not doped with photosensitive color-changing materials.
In an exemplary embodiment, the material of the attenuating layer includes a light-sensitive color-changing material.
In an exemplary embodiment, the light-sensitive color-changing material includes at least one of: spiropyran compounds and silver halide compounds.
The embodiment of the application provides a display substrate, display substrate includes a plurality of pixels, and every pixel includes red subpixel, green subpixel and blue subpixel, red subpixel, green subpixel and blue subpixel include: the pixel definition functional layer is arranged on one side of the first electrode, which is far away from the backboard, and the pixel definition functional layer, the light emitting layer and the second electrode are sequentially arranged on the backboard; the attenuation speed of the pixel definition functional layer of the red sub-pixel and the pixel definition functional layer of the green sub-pixel to light is larger than that of the pixel definition functional layer of the blue sub-pixel to light. In the embodiment of the application, the attenuation of red light and green light is increased on the pixel definition functional layer, and the attenuation of blue light under a large visual angle is compensated faster than the attenuation of red light and green light, so that the light attenuation of red, green and blue (RGB) under the large visual angle is converged, the problem that the color of the large visual angle is slightly yellow is solved, and the display effect under the large visual angle is optimized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic illustration of the attenuation of light of different colors;
FIG. 2 is a schematic view of a display substrate according to an embodiment;
FIG. 3 is a schematic diagram of a driving structure layer after formation;
FIG. 4 is a schematic view after forming a first electrode pattern;
FIG. 5 is a schematic diagram of a pixel defining layer pattern after forming red and green sub-pixels;
FIG. 6 is a schematic diagram of a pixel defining layer pattern after forming a blue sub-pixel;
FIG. 7 is a schematic view after patterning a support layer;
FIG. 8 is a schematic view of a display substrate according to another embodiment;
FIG. 9 is a schematic view after forming a first electrode pattern;
FIG. 10 is a schematic view after forming a pixel defining layer and a supporting layer pattern;
FIG. 11 is a schematic view after forming an attenuating layer pattern;
FIG. 12 is a schematic cross-sectional view of a pixel defining layer;
FIG. 13 is a schematic view of a display substrate according to another embodiment;
fig. 14 is a flowchart of a method for manufacturing a display substrate according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present application, the embodiments and features of the embodiments may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
In the drawings, the size of each component, the thickness of layers, or regions may be exaggerated for clarity. Therefore, the embodiments of the present disclosure are not necessarily limited to the dimensions, and the shapes and sizes of the respective components in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and the embodiments of the present disclosure are not limited to the shapes or numerical values shown in the drawings.
The ordinal numbers such as "first", "second", "third", etc., in this disclosure are provided to avoid confusion among the constituent elements, and do not indicate any order, number, or importance.
In the present disclosure, for convenience, terms indicating orientation or positional relationship such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are used to explain positional relationship of constituent elements with reference to the drawings, only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present disclosure. The positional relationship of the components is changed as appropriate in accordance with the direction in which each component is described. Therefore, the words described in the disclosure are not limited thereto, and may be replaced as appropriate.
In this disclosure, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically stated or limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
In the present disclosure, "parallel" means a state in which an angle formed by two straight lines is-10 ° or more and 10 ° or less, and therefore, includes a state in which the angle is-5 ° or more and 5 ° or less. The term "perpendicular" refers to a state in which the angle formed by two straight lines is 80 ° or more and 100 ° or less, and therefore includes a state in which the angle is 85 ° or more and 95 ° or less.
In the present disclosure, "film" and "layer" may be interchanged with one another. For example, the "conductive layer" may be sometimes replaced with a "conductive film". Similarly, the "insulating film" may be replaced with an "insulating layer".
As shown in fig. 1, in the OLED display panel, the intensity of light with a blue wavelength (about 450nm to 470 nm) (line B in fig. 1) is more attenuated than light with a green wavelength (about 515nm to 530nm, line G in fig. 1) and a red wavelength (about 620nm to 625nm, line R in fig. 1) at a large viewing angle (≧ 60 °), which causes the color shift to yellow at a large viewing angle. In one technical scheme, the problem of large-angle color cast yellowing of an OLED device is solved by filling and sequentially stacking a plurality of refractive index layers between a cathode and an anode and changing the refractive index of the stacked layers, however, the method for stacking the plurality of refractive index layers can increase the production time and the equipment quantity during production, and simultaneously, the method can reduce the light intensity of R/G/B and rapidly weaken the brightness of the side edge.
The embodiment of the application provides a display substrate, display substrate includes a plurality of pixels, and every pixel includes red subpixel, green subpixel and blue subpixel, red subpixel, green subpixel and blue subpixel include: the pixel definition functional layer is arranged on one side of the first electrode, which is far away from the backboard, and the pixel definition functional layer, the light emitting layer and the second electrode are sequentially arranged on the backboard; the attenuation speed of the pixel definition functional layer of the red sub-pixel and the pixel definition functional layer of the green sub-pixel to light is larger than that of the pixel definition functional layer of the blue sub-pixel to light. In the embodiment of the application, the attenuation of red light and green light is increased on the pixel definition functional layer, and the attenuation of blue light under a large visual angle is compensated faster than the attenuation of red light and green light, so that the L-Decay (light attenuation) of red, green and blue (RGB) under the large visual angle is converged, the problem of color bias yellowing under the large visual angle is improved, and the display effect under the large visual angle is optimized. In addition, compared with a scheme of arranging a plurality of refractive index layers, the scheme provided by the embodiment of the application is simpler and more convenient to realize, lower in cost and higher in emergent light intensity.
In an exemplary embodiment, the pixel definition function layer includes a pixel definition layer and a support layer arranged in sequence from the direction close to the backplane to the direction far from the backplane, and the pixel definition layer of the red sub-pixel and the pixel definition layer of the green sub-pixel attenuate light at a speed higher than that of the pixel definition layer of the blue sub-pixel. The pixel defining layer may include a pixel opening region in which the light emitting layer is disposed. In this embodiment, the light is attenuated by directly using the pixel defining layer, the red sub-pixel and the green sub-pixel are used as one group, the blue sub-pixel is used as another group, and the pixel defining layer with different attenuation speeds of the light is used to reduce the red light and the green light and avoid the problem of yellow color cast. The pixel definition layers of the red sub-pixel and the green sub-pixel, and the specific attenuation speed of the pixel definition layer of the blue sub-pixel to light can be set according to requirements, for example, the attenuation speeds of the red sub-pixel and the green sub-pixel can be determined through testing; alternatively, it may be determined by calculation.
In an exemplary embodiment, the pixel defining layers of the red and green sub-pixels are made of a material doped with a light-sensitive color-changing material, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of a material not doped with a light-sensitive color-changing material;
or, the pixel defining layer and the supporting layer of the red sub-pixel and the green sub-pixel are made of materials doped with photosensitive color-changing materials, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of materials not doped with photosensitive color-changing materials. That is, the support layers of the red and green sub-pixels may be made of a material doped with a light-sensitive color-changing material, or may be made of a material not doped with a light-sensitive color-changing material.
In this embodiment, the photochromic material is changed in color under illumination to absorb or block light, so that the attenuation speed of light emitted by the red sub-pixel and the green sub-pixel is greater than that of light emitted by the blue sub-pixel, imbalance caused by faster blue light attenuation under a large viewing angle is compensated, the attenuation of red light, green light and blue light is more balanced, partial yellowing of color under the large viewing angle is avoided, and the display effect under the large viewing angle is improved.
In an exemplary embodiment, the photochromatic material may absorb or block light. The doping proportion of the photosensitive color-changing material can be obtained through experiments or calculated according to attenuation requirements.
In an exemplary embodiment, the photochromic material may include at least one of: spiropyran compounds and silver halide compounds. Spiropyran compounds are a class of stable, reversible photochromic compounds. When irradiated with light of a certain wavelength and intensity, interconversion between the two isomers, the closed-ring colourless spiropyran configuration (SP) and the open-ring coloured Merocyanine Configuration (MC) occurs. The silver halide compound is a compound formed by halogen and silver, such as silver chloride, silver bromide and the like. The spiropyran-based compound and the silver halide-based compound are dark in color when irradiated with light, and absorb light. The examples of the present application are not limited to the spiropyran-based compounds and the silver halide-based compounds, and other photochromic materials may be used.
In an exemplary embodiment, the pixel definition function layer of the red and green sub-pixels includes a pixel definition layer, an attenuation layer and a support layer, which are sequentially arranged from the direction close to the back plate to the direction far from the back plate, and the attenuation layer covers the pixel definition layer; the pixel defining function layer of the blue sub-pixel comprises a pixel defining layer and a supporting layer which are arranged in sequence, wherein the attenuation layer is arranged to attenuate light. In this embodiment, the red sub-pixel and the green sub-pixel are additionally provided with the attenuation layers to attenuate light, so that the red light and the green light are attenuated, while the blue sub-pixel is not provided with the attenuation layers, and the attenuation speed of the blue light is lower than that of the red light and the green light, so that the color cast is prevented from being yellow.
In an exemplary embodiment, the pixel definition function layer of the red sub-pixel and the pixel definition function layer of the green sub-pixel comprise a pixel definition layer, a support layer and an attenuation layer which are arranged in sequence from the direction close to the back plate to the direction far from the back plate, wherein the attenuation layer covers the pixel definition layer and the support layer; the pixel definition function layer of the blue sub-pixel comprises a pixel definition layer and a supporting layer which are sequentially arranged; wherein the attenuating layer is configured to attenuate light. In this embodiment, the red sub-pixel and the green sub-pixel are additionally provided with the attenuation layers, and the attenuation layers attenuate light, so that red light and green light are attenuated, while the blue sub-pixel is not provided with the attenuation layers, and the attenuation speed of blue light is lower than that of the red light and the green light, so that imbalance caused by greater attenuation of the blue light at a large viewing angle can be compensated, and color bias yellowing at the large viewing angle is avoided.
In an exemplary embodiment, the display substrate is a top-emitting device including a microcavity structure. The microcavity is formed by placing the light emitting region in a resonant cavity formed by a total reflection film and a semi-reflection film. The semitransparent cathode can be regarded as a semi-reflective film, and the anode can use a total reflection anode, or a total reflection film (such as a total reflection electrode) is additionally arranged, so that a microcavity structure is formed. The optical length between the two mirror surfaces is called the microcavity length. By designing different microcavity lengths, emissions of different color wavelengths can be obtained. Due to the strong reflection effect of the total reflection electrode, the light directly emitted by the light emitting layer and the light reflected by the total reflection electrode interfere with each other, so that the spectrum of the light near the wavelength corresponding to the resonant wavelength of the cavity length can be widened, the color purity and the color gamut can be improved, the light intensity of the light near the wavelength corresponding to the resonant wavelength of the cavity length can be enhanced, and the brightness can be improved. By this technique, different colors of light emission can be produced using the same light emitting layer. The light emitting layer may include a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an Emission Material Layer (EML), an Electron Transport Layer (ETL), and an Electron Injection Layer (EIL), and the microcavity effect may be achieved by evaporating the Hole Injection Layer (HIL) with different thicknesses or evaporating the Hole Transport Layer (HTL) with different thicknesses, which is not limited in this embodiment of the present application. The top emission device is a device emitting light from the top of the device, is not influenced by the bottom driving panel, and can effectively improve the aperture opening ratio.
Fig. 2 is a schematic view of a display substrate according to an embodiment of the present disclosure. As shown in fig. 2, a display substrate provided in an embodiment of the present application includes a plurality of pixels, each pixel includes a red sub-pixel 101, a green sub-pixel 102, and a blue sub-pixel 103, and each sub-pixel may include: the display device comprises a substrate 10, a driving structure layer 20 arranged on the substrate 10, a first electrode 31 arranged on one side, far away from the substrate 10, of the driving structure layer 20, a pixel definition layer 32 arranged on one side, far away from the substrate 10, of the first electrode 31, a support layer (PS) 35 arranged on one side, far away from the substrate 10, of the pixel definition layer 32, and a light emitting layer 33 and a second electrode 34 which are sequentially arranged on one side, far away from the substrate 10, of the pixel definition layer 32. The pixel defining layer 32 is provided with a pixel opening area in which the light emitting layer 33 is disposed. The substrate 10 and the driving structure layer 20 constitute a back plate. Wherein, the light attenuation speed of the pixel defining layer 32 of the red sub-pixel 101 and the light attenuation speed of the pixel defining layer 32 of the green sub-pixel 102 are greater than the light attenuation speed of the pixel defining layer 32 of the blue sub-pixel 103.
In this embodiment, the pixel definition layer 32 attenuates red light and green light, and compensates for the blue light attenuation at a large viewing angle, so that the red light, the green light, and the blue light are attenuated relatively uniformly, and the problem of color shift and yellowing at a large viewing angle is solved.
In an exemplary embodiment, the pixel defining layer 32 of the red sub-pixel 101 and the pixel defining layer 32 of the green sub-pixel 102 are made of a material doped with a light-sensitive color-changing material, and the pixel defining layer 32 of the blue sub-pixel 103 is made of a material not doped with a light-sensitive color-changing material. The photochromic material is photochromic compound. The photochromic material may include at least one of: spiropyran compounds and silver halide compounds. The photosensitive color-changing material becomes dark color under the irradiation of light, and can absorb the light and reduce the light intensity.
In an exemplary embodiment, the first electrode 31 is, for example, an anode, and the second electrode 34 is, for example, a cathode.
In an exemplary embodiment, the pixel defining layer 32 of the blue sub-pixel 103 may be made of a polyimide material, and the red sub-pixel 101 and the green sub-pixel 102 are made of a material obtained by doping the polyimide material with a silver halide compound, where the doping ratio is determined according to the attenuation requirement, or according to a test, for example, a display substrate made of doped materials with different ratios is tested for the display effect, and a material with a display effect at a large viewing angle is selected.
In an exemplary embodiment, the support layer 35 of the red sub-pixel 101 and the support layer 35 of the green sub-pixel 102 may be made of a material doped with a photosensitive color-changing material, such as a material doped with a polyimide-based material and a silver halide-based compound; alternatively, the support layer 35 of the red sub-pixel 101 and the support layer 35 of the green sub-pixel 102 may be made of a material that is not doped with a photosensitive color-changing material, for example, a polyimide-based material. The support layer 35 of the blue sub-pixel 103 may be made of a polyimide-based material. When the support layer 35 of the red sub-pixel 101, the support layer 35 of the green sub-pixel 102, and the support layer of the blue sub-pixel 103 are all made of polyimide materials, the manufacturing steps can be simplified, and the cost can be reduced.
The following describes the technical solution of this embodiment through the manufacturing process of the display substrate of this embodiment. The "patterning process" in this embodiment includes processes of depositing a film, coating a photoresist, exposing a mask, developing, etching, and stripping the photoresist, and is a well-established manufacturing process in the related art. The deposition may be performed by a known process such as sputtering, evaporation, chemical vapor deposition, etc., the coating may be performed by a known coating process, and the etching may be performed by a known method, which is not particularly limited herein. In the description of the present embodiment, it is to be understood that "thin film" refers to a layer of a material deposited or coated on a substrate. The "thin film" may also be referred to as a "layer" if it does not require a patterning process or a photolithography process throughout the fabrication process. If a patterning process or a photolithography process is required for the "thin film" in the entire manufacturing process, the "thin film" is referred to as a "thin film" before the patterning process, and the "layer" after the patterning process. The "layer" after the patterning process or the photolithography process includes at least one "pattern".
FIGS. 3-7 are schematic diagrams illustrating a manufacturing process of the display substrate of this embodiment. The preparation process of the display substrate comprises the following steps:
(1) the substrate 10 is formed, and the substrate 10 may include a first substrate, a buffer layer, and a second substrate, which are sequentially disposed.
Forming the base pattern includes: firstly, a layer of flexible material is coated on a glass carrier plate, and the flexible material is solidified into a film to form a first substrate. Then, a buffer film is deposited on the first substrate to form a buffer pattern covering the entire first substrate. And finally, coating a layer of flexible material on the buffer layer, and curing to form a film to form a second substrate. The flexible material can be polyimide PI, polyethylene terephthalate PET or a polymer soft film subjected to surface treatment and the like to form a flexible substrate. The buffer film may be made of silicon nitride SiNx, silicon oxide SiOx, or the like, and may have a single-layer structure or a multilayer structure of silicon nitride/silicon oxide. Here, by way of example only, the substrate may be other types of substrates, such as a silicon-based substrate, and so on.
(2) The driving circuit layer 20 is formed. The driving circuit layer 20 includes a plurality of gate lines and a plurality of data lines, the plurality of gate lines and the plurality of data lines vertically intersect to define a plurality of sub-pixels arranged in an array, 3 sub-pixels constitute a pixel unit, and each sub-pixel includes a plurality of Thin Film Transistors (TFTs) including a driving Transistor 21. In this embodiment, one pixel unit includes a red subpixel 101, a green subpixel 102, and a blue subpixel 103. Of course, the scheme of the present embodiment is also applicable to the case where one pixel unit includes more sub-pixels. In this embodiment, the preparation process of forming the driving circuit layer 20 may include: an active layer is prepared on the substrate 10 of each sub-pixel through a patterning process, a first insulating layer covering the active layer is then formed, a gate line and a gate electrode are formed on the first insulating layer of each sub-pixel, a second insulating layer covering the gate line and the gate electrode is then formed, a data line, a source electrode and a drain electrode are formed on the second insulating layer of each sub-pixel, a third insulating layer covering the data line, the source electrode and the drain electrode is formed, and a first via hole K1 exposing the drain electrode 22 of the driving transistor 21 is opened on the third insulating layer of each sub-pixel, as shown in fig. 3. The gate electrode, the active layer, the source electrode, and the drain electrode form a thin film transistor, and the thin film transistor may have a bottom gate structure or a top gate structure, which is not limited herein.
(3) The first electrode 31 is patterned.
Forming the first electrode 31 includes: depositing a first metal film on the basis of the above structure, patterning the first metal film through a patterning process, forming a first electrode 31 on the driving circuit layer 20, wherein the first electrode 31 is connected to the drain electrode 22 of the driving transistor 21 through a first via hole K1; as shown in fig. 4.
(4) A pixel defining layer 32 pattern of red and green sub-pixels is formed.
The first pixel defining film is coated on the substrate on which the patterns are formed, and the patterns of the pixel defining layer 321 of the red sub-pixel and the pixel defining layer 322 of the green sub-pixel are formed after masking, exposure and development, wherein the pixel defining layer 321 defines a pixel opening area in the red sub-pixel 101, and the pixel opening area exposes the first electrode 31. The pixel defining layer 322 defines a pixel opening region in the green sub-pixel 102, and the pixel opening region exposes the first electrode 31. As shown in fig. 5.
The first pixel defining film is formed by doping a polyimide-based material and a silver halide-based compound.
(5) A pixel defining layer pattern of the blue sub-pixel is formed.
And coating a second pixel defining film on the substrate on which the pattern is formed, and forming a pixel defining layer 323 pattern of the blue sub-pixel after masking, exposing and developing, wherein the pixel defining layer 323 defines a pixel opening area in the blue sub-pixel 103, and the pixel opening area exposes the first electrode 31. As shown in fig. 6.
The second pixel defining film is, for example, a polyimide-based material.
(6) A support layer 35 is patterned.
And coating a supporting layer film on the substrate on which the pattern is formed, and forming a supporting layer 35 pattern by using a mask, exposing and developing, wherein the supporting layer 35 comprises a first supporting layer 351 and a second supporting layer 352 which are distributed on two sides of the pixel opening area. As shown in fig. 7.
The support layer film is, for example, a polyimide-based material.
In another embodiment, the support layer 35 of the red sub-pixel 101, the green sub-pixel 102 and the blue sub-pixel 103 may be made of different materials, for example, when the support layer 35 of the red sub-pixel 101 and the support layer 35 of the green sub-pixel 102 may be made of materials formed by doping a polyimide-based material with a silver halide-based compound, and the support layer 35 of the blue sub-pixel 103 may be made of a polyimide-based material, in this case, similar to the preparation process of the pixel defining layer 32, the support layer 35 is prepared in two steps, for example, the support layer of the red sub-pixel 101 and the support layer of the green sub-pixel 102 are prepared first, and then the support layer of the blue sub-pixel 103 is prepared; alternatively, the support layer of the blue sub-pixel 103 is prepared first, and then the support layer of the red sub-pixel 101 and the support layer of the green sub-pixel 102 are prepared.
(7) The light emitting layer 33 and the second electrode 34 are patterned.
On the structure where the aforementioned pattern is formed, the light emitting layer 33 is formed in the pixel opening region of each sub-pixel. Finally, a metal film is deposited on the substrate on which the aforementioned pattern is formed, and a second electrode 34 is formed, as shown in fig. 2. In this embodiment, the second electrode 34 may be a transparent electrode with high magnesium (Mg), that is, all or most of the second electrode is made of Mg, which can improve transmittance; alternatively, the second electrode 34 may be a semi-reflective semi-permeable electrode, made using Mg and Ag, or the like.
In one embodiment, the display substrate is a device in which a microcavity structure is present. The light emitting layers 33 of the red sub-pixel 101, the green sub-pixel 102, and the blue sub-pixel 103 may be light emitting layers emitting white light, and the white light emitted from the light emitting layers 33 respectively obtains red light, green light, and blue light by a microcavity effect. The microcavity structure can be implemented in a variety of ways. For example, a reflective electrode may be disposed between the driving structure layer 20 and the first electrode 31, and the distances between the reflective electrode of different sub-pixels and the second electrode 34 are different, so as to form different microcavity lengths, and realize that different sub-pixels emit light with different colors. The microcavity structure is merely an example, and other structures are possible, and the embodiments of the present application do not limit this.
According to the scheme provided by the embodiment, the pixel definition layers of the red sub-pixel, the green sub-pixel and the blue sub-pixel are prepared by using different pixel definition films, so that different attenuations of red light, green light and blue light are realized, and the problem of color cast yellowing under a large viewing angle is solved.
The structure shown in this example and the process for making it are merely exemplary. In practical implementation, the corresponding structure can be changed and the patterning process can be increased or decreased according to actual needs. For example, the driving structure layer may be provided with other electrodes, leads, structural film layers, and the like.
Fig. 8 is a schematic view of a display substrate according to another embodiment. As shown in fig. 8, the display substrate provided in this embodiment includes: a plurality of pixels, each pixel including a red subpixel 101, a green subpixel 102, and a blue subpixel 103, wherein the red subpixel 101 and the green subpixel 102 include: the pixel structure comprises a substrate 10, a driving structure layer 20 arranged on the substrate 10, a first electrode 31 arranged on the side of the driving structure layer 20 far away from the substrate 10, a pixel definition layer 32 arranged on the side of the first electrode 31 far away from the substrate 10, a support layer 35 arranged on the side of the pixel definition layer 32 far away from the substrate 10, and an attenuation layer 36 covering the surfaces of the pixel definition layer 32 and the support layer 35; a light-emitting layer 33 and a second electrode 34 disposed in this order on the side of the pixel defining layer 32 remote from the substrate 10. Wherein the second electrode is arranged on the side of the attenuating layer 36 facing away from the substrate. The attenuating layer 36 is arranged to attenuate light. Blue subpixel 103, unlike red subpixel 101 and green subpixel 102, does not include attenuating layer 36. The blue sub-pixel 103 includes: the display device comprises a substrate 10, a driving structure layer 20 arranged on the substrate 10, a first electrode 31 arranged on one side of the substrate far away from the driving structure layer 20, a pixel definition layer 32 arranged on one side of the substrate far away from the first electrode 31, a support layer (PS) 35 arranged on one side of the substrate 10 far away from the pixel definition layer 32, a light emitting layer 33 and a second electrode 34 which are arranged on one side of the substrate far away from the pixel definition layer 32 in sequence. In this embodiment, the attenuation layer 36 is disposed in the red sub-pixel 101 and the green sub-pixel 102, the attenuation layer is not disposed in the blue sub-pixel 103, and the attenuation layer 36 is used to attenuate the red light and the green light, so as to compensate for the imbalance caused by the blue light with a greater attenuation degree than the red light and the green light at a large viewing angle, so that the attenuation of the red light, the green light and the blue light at a large viewing angle is balanced, and the problem of color shift yellowing at a large viewing angle is solved.
In an exemplary embodiment, the attenuating layer 36 may be made using a photochromic material. The photosensitive color-changing material refers to the description in the foregoing embodiments, and is not repeated here. The thickness of attenuating layer 36 may be set according to attenuation requirements or determined according to the manner of testing.
The following describes the technical solution of this embodiment through the manufacturing process of the display substrate of this embodiment.
FIGS. 9-11 are schematic diagrams illustrating a manufacturing process of the display substrate of this embodiment. The preparation process of the display substrate comprises the following steps:
(1) the substrate 10, the driving circuit layer 20 and the first electrode 31 are patterned. Reference may be made to the previous embodiment, which is not described in detail herein. The resulting structure is shown in fig. 9.
(2) Forming a pixel defining layer 32 pattern and a supporting layer 35 pattern;
a pixel defining film is coated on the substrate on which the pattern is formed, and a pixel defining layer 32 is patterned after masking, exposure and development, the pixel defining layer 32 defining an opening region exposing the first electrode 31. The pixel defining film is, for example, a polyimide-based material.
Coating a supporting layer film on the substrate on which the patterns are formed, and forming a supporting layer 35 pattern by masking, exposing and developing, wherein the supporting layer 35 comprises a first supporting layer 351 and a second supporting layer 352, and the first supporting layer 351 and the second supporting layer 352 are distributed on two sides of the pixel opening area on a cross section perpendicular to the substrate 10. As shown in fig. 10.
The shape of the cross-section of the pixel opening region of the pixel defining layer 32 in a plane perpendicular to the substrate 10 may be: trapezoidal, inverted trapezoidal (not shown in fig. 12), rectangular, hexagonal, etc. shapes; as shown in fig. 12. The structure shown in fig. 12 is merely an example, and the present application is not limited thereto.
(3) Forming a pattern of attenuating layer 36;
the attenuation layer film is coated on the substrate on which the patterns are formed, and the attenuation layer 36 patterns are formed after masking, exposure and development, wherein the attenuation layer 36 covers the pixel defining layer 32 and the supporting layer 35 in the red sub-pixel 101 and the green sub-pixel 102, the first electrode 31 is exposed, and the attenuation layer 36 does not cover the pixel defining layer 32 and the supporting layer 35 of the blue sub-pixel 103. As shown in fig. 11. The attenuating layer 36 may be prepared by coating (coating), or may be prepared by evaporation, gas phase chemical deposition, or the like, which is not limited in the embodiments of the present application. The attenuating layer film may be a photochromic material such as a spiropyran-based compound, a silver halide-based compound, or the like.
(4) The light emitting layer 33 and the second electrode 34 are patterned.
On the structure where the aforementioned pattern is formed, the light emitting layer 33 is formed in the opening region of each sub-pixel.
A metal thin film is deposited on the substrate on which the aforementioned pattern is formed, and a second electrode 34 is formed, as shown in fig. 8. In this embodiment, the second electrode 34 may be a transparent electrode with high magnesium (Mg), that is, all or most of the second electrode is made of Mg, which can improve transmittance; alternatively, the second electrode 34 may be a semi-reflective semi-permeable electrode, made using Mg and Ag, or the like.
Fig. 13 is a schematic view of a display substrate according to another embodiment. As shown in fig. 13, the display substrate provided in this embodiment includes: a plurality of pixels, each pixel including a red subpixel 101, a green subpixel 102, and a blue subpixel 103, wherein the red subpixel 101 and the green subpixel 102 include: the pixel structure comprises a substrate 10, a driving structure layer 20 arranged on the substrate 10, a first electrode 31 arranged on the side of the driving structure layer 20 far away from the substrate 10, a pixel definition layer 32 arranged on the side of the first electrode 31 far away from the substrate 10, an attenuation layer 36 arranged on the side of the pixel definition layer 32 far away from the substrate 10, and a support layer 35 arranged on the side of the attenuation layer 36 far away from the substrate; a light-emitting layer 33 and a second electrode 34 disposed in this order on the side of the pixel defining layer 32 remote from the substrate 10. Wherein the second electrode 34 is arranged on a side of the support layer 35 away from the substrate 10. The attenuating layer 36 covers a surface of the pixel defining layer 32, the attenuating layer 36 being arranged to attenuate light. Blue subpixel 103, unlike red subpixel 101 and green subpixel 102, does not include attenuating layer 36. The blue sub-pixel 103 includes: the display device comprises a substrate 10, a driving structure layer 20 arranged on the substrate 10, a first electrode 31 arranged on one side of the driving structure layer 20 far away from the substrate, a pixel definition layer 32 arranged on one side of the first electrode 31 far away from the substrate, a supporting layer 35 arranged on one side of the pixel definition layer 32 far away from the substrate 10, a light emitting layer 33 arranged on one side of the pixel definition layer 32 far away from the substrate, and a second electrode 34. In this embodiment, the attenuation layer 36 is disposed in the red sub-pixel 101 and the green sub-pixel 102, the attenuation layer is not disposed in the blue sub-pixel 103, and the attenuation layer 36 is used to attenuate the red light and the green light, so as to compensate for the imbalance caused by the blue light with a greater attenuation degree than the red light and the green light at a large viewing angle, so that the attenuation of the red light, the green light and the blue light at a large viewing angle is balanced, and the problem of color shift yellowing at a large viewing angle is solved.
In the manufacturing process of the display substrate provided in this embodiment, after the pixel defining layer 32 is manufactured, the attenuating layer 36 is manufactured, then the supporting layer 35 is manufactured, and then the light emitting layer 33 and the second electrode 34 are manufactured.
Fig. 14 is a flowchart of a method for manufacturing a display substrate according to an embodiment of the present disclosure. As shown in fig. 14, an embodiment of the present application provides a method for manufacturing a display substrate, where the display substrate includes a plurality of pixels, and the pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the method includes:
In an exemplary embodiment, the forming the pixel definition function layer includes:
forming a pixel defining layer of red sub-pixels and green sub-pixels on one side of the first electrode, which is far away from the backboard;
forming a pixel definition layer of a blue sub-pixel on one side of the first electrode, which is far away from the backboard; wherein the light attenuation speed of the pixel definition layer of the red sub-pixel and the light attenuation speed of the pixel definition layer of the green sub-pixel are greater than the light attenuation speed of the pixel definition layer of the blue sub-pixel;
a support layer is formed on the pixel defining layer.
In an exemplary embodiment, the forming the pixel definition function layer includes:
forming a pixel defining layer of each sub-pixel on one side of the first electrode away from the back plate;
forming an attenuating layer covering the pixel defining layer of the red sub-pixel and the pixel defining layer of the blue sub-pixel on the pixel defining layer;
forming a support layer on the attenuating layer;
alternatively, the first and second electrodes may be,
forming a pixel defining layer of each sub-pixel on one side of the first electrode away from the back plate;
forming a support layer on the pixel defining layer;
forming an attenuating layer on the pixel defining layer and the supporting layer, the attenuating layer covering the pixel defining layer and the supporting layer of the red sub-pixel, and the pixel defining layer and the supporting layer covering the green sub-pixel;
wherein the attenuating layer is configured to attenuate light.
In an exemplary embodiment, the pixel defining layers of the red and green sub-pixels are made of a material doped with a light-sensitive color-changing material, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of a material not doped with a light-sensitive color-changing material;
or, the pixel defining layer and the supporting layer of the red sub-pixel and the green sub-pixel are made of materials doped with photosensitive color-changing materials, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of materials not doped with photosensitive color-changing materials.
In an exemplary embodiment, the material of the attenuating layer includes a light-sensitive color-changing material.
In an exemplary embodiment, the light-sensitive color-changing material includes at least one of: spiropyran compounds and silver halide compounds.
In this embodiment, the structure, material, related parameters, and detailed preparation process of each film layer have been described in detail in the foregoing embodiments, and are not described herein again.
According to the preparation method of the display substrate, the pixel definition functional layer with the high attenuation speed is arranged for the red sub-pixel and the green sub-pixel, the pixel definition functional layer with the low attenuation speed is arranged for the blue sub-pixel, and the red light and the green light are attenuated more quickly, so that imbalance caused by the fact that the attenuation of the blue light is large under a large visual angle is compensated, the attenuation speeds of the red light, the green light and the blue light are balanced, the problem that the color is yellow partially under the large visual angle is solved, and the display effect is improved. In addition, the preparation method of the display substrate provided by the embodiment of the invention can adopt the existing mature process equipment and process flow, is simple and convenient to realize and has low cost.
Based on the technical idea of the embodiment of the present application, an embodiment of the present application further provides a display device, including the display substrate of the foregoing embodiment. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The following points need to be explained:
(1) the drawings of the embodiments of the invention only relate to the structures related to the embodiments of the invention, and other structures can refer to common designs.
(2) The thickness of layers or regions in the figures used to describe embodiments of the invention may be exaggerated or reduced for clarity, i.e., the figures are not drawn on a true scale. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
(3) Without conflict, embodiments of the present invention and features of the embodiments may be combined with each other to arrive at new embodiments.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (15)
1. A display substrate comprising a plurality of pixels, each pixel comprising a red sub-pixel, a green sub-pixel, and a blue sub-pixel, the red, green, and blue sub-pixels comprising: the pixel definition functional layer is arranged on one side of the first electrode, which is far away from the backboard, and the pixel definition functional layer, the light emitting layer and the second electrode are sequentially arranged on the backboard; the attenuation speed of the pixel definition functional layer of the red sub-pixel and the green sub-pixel to light is larger than that of the pixel definition functional layer of the blue sub-pixel to light.
2. The display substrate according to claim 1, wherein the pixel defining function layer comprises a pixel defining layer and a supporting layer arranged in this order from the direction close to the back plate to the direction away from the back plate, and the pixel defining layer of the red sub-pixel and the pixel defining layer of the green sub-pixel have a higher attenuation speed of light than the pixel defining layer of the blue sub-pixel.
3. The display substrate according to claim 1, wherein the pixel definition function layer of the red and green sub-pixels comprises a pixel definition layer, an attenuation layer and a support layer which are arranged in sequence from the direction close to the back plate to the direction away from the back plate, wherein the attenuation layer covers the pixel definition layer; the pixel definition function layer of the blue sub-pixel comprises a pixel definition layer and a supporting layer which are sequentially arranged;
or, from the direction close to the backplane to the direction far away from the backplane, the pixel definition function layer of the red sub-pixel and the pixel definition function layer of the green sub-pixel comprise a pixel definition layer, a support layer and an attenuation layer which are sequentially arranged, and the attenuation layer covers the pixel definition layer and the support layer; the pixel definition function layer of the blue sub-pixel comprises a pixel definition layer and a supporting layer which are sequentially arranged;
wherein the attenuating layer is configured to attenuate light.
4. The display substrate according to claim 2, wherein the pixel defining layers of the red and green sub-pixels are made of a material doped with a light-sensitive color-changing material, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of a material not doped with a light-sensitive color-changing material;
or, the pixel defining layer and the supporting layer of the red sub-pixel and the green sub-pixel are made of materials doped with photosensitive color-changing materials, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of materials not doped with photosensitive color-changing materials.
5. The display substrate of claim 3, wherein the material of the attenuating layer comprises a photochromic material.
6. The display substrate of claim 4 or 5, wherein the light-sensitive color-changing material comprises at least one of: spiropyran compounds and silver halide compounds.
7. The display substrate according to any one of claims 2 to 5, wherein the pixel defining layer is provided with a pixel opening region, the light emitting layer is provided in the pixel opening region, and a cross-sectional shape of the pixel opening region in a plane perpendicular to the backplane includes: trapezoidal, inverted trapezoidal, rectangular.
8. The display substrate according to any one of claims 1 to 5, wherein the display substrate is a top-emitting device comprising a microcavity structure.
9. A display device comprising the display substrate according to any one of claims 1 to 8.
10. A method of manufacturing a display substrate including a plurality of pixels including red, green, and blue sub-pixels, the method comprising:
forming a back plate;
forming a first electrode on the back plate;
sequentially forming a pixel definition functional layer, a light emitting layer and a second electrode on one side of the first electrode, which is far away from the backboard; the attenuation speed of the pixel definition functional layer of the red sub-pixel and the pixel definition functional layer of the green sub-pixel to light is larger than that of the pixel definition functional layer of the blue sub-pixel to light.
11. The method of manufacturing a display substrate according to claim 10, wherein the forming a pixel definition function layer comprises:
forming a pixel defining layer of red sub-pixels and green sub-pixels on one side of the first electrode, which is far away from the backboard;
forming a pixel definition layer of a blue sub-pixel on one side of the first electrode, which is far away from the backboard; wherein the light attenuation speed of the pixel definition layer of the red sub-pixel and the light attenuation speed of the pixel definition layer of the green sub-pixel are greater than the light attenuation speed of the pixel definition layer of the blue sub-pixel;
a support layer is formed on the pixel defining layer.
12. The method of manufacturing a display substrate according to claim 10, wherein the forming a pixel definition function layer comprises:
forming a pixel defining layer of each sub-pixel on one side of the first electrode away from the back plate;
forming an attenuating layer covering the pixel defining layer of the red sub-pixel and the pixel defining layer of the blue sub-pixel on the pixel defining layer;
forming a support layer on the attenuating layer;
alternatively, the first and second electrodes may be,
forming a pixel defining layer of each sub-pixel on one side of the first electrode away from the back plate;
forming a support layer on the pixel defining layer;
forming an attenuating layer on the pixel defining layer and the supporting layer, the attenuating layer covering the pixel defining layer and the supporting layer of the red sub-pixel, and the pixel defining layer and the supporting layer covering the green sub-pixel;
wherein the attenuating layer is configured to attenuate light.
13. The method of manufacturing a display substrate according to claim 11, wherein the pixel defining layers of the red and green sub-pixels are made of a material doped with a light-sensitive color-changing material, and the pixel defining layer and the support layer of the blue sub-pixel are made of a material not doped with a light-sensitive color-changing material;
or, the pixel defining layer and the supporting layer of the red sub-pixel and the green sub-pixel are made of materials doped with photosensitive color-changing materials, and the pixel defining layer and the supporting layer of the blue sub-pixel are made of materials not doped with photosensitive color-changing materials.
14. The method of claim 12, wherein the material of the attenuating layer comprises a photochromic material.
15. The method of claim 13 or 14, wherein the photochromic material comprises at least one of: spiropyran compounds and silver halide compounds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010825829.0A CN111933670A (en) | 2020-08-17 | 2020-08-17 | Display substrate, preparation method thereof and display device |
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| CN114023908A (en) * | 2021-11-03 | 2022-02-08 | 云谷（固安）科技有限公司 | Display panel, preparation method thereof and display device |
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