CN110504381B - Display panel, manufacturing method of display panel and display device - Google Patents
Display panel, manufacturing method of display panel and display device Download PDFInfo
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- CN110504381B CN110504381B CN201910782336.0A CN201910782336A CN110504381B CN 110504381 B CN110504381 B CN 110504381B CN 201910782336 A CN201910782336 A CN 201910782336A CN 110504381 B CN110504381 B CN 110504381B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K50/865—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
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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
- H10K59/10—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
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
Abstract
The invention discloses a display panel, a manufacturing method of the display panel and a display device. The display panel includes: a substrate; a light emitting element layer on the substrate, the light emitting element layer including a plurality of light emitting elements; and the light adjusting layer is positioned on the light emergent side of the light emitting element layer and comprises a black matrix and a plurality of light filtering units, the black matrix comprises a plurality of openings, at least part of each light filtering unit is arranged in each opening, the plurality of light filtering units correspond to the plurality of light emitting elements respectively, and the surface of at least part of the light filtering units, which deviates from the light emitting element layer, is a diffuse reflection surface. According to the display panel provided by the embodiment of the invention, the reflection effect of the light adjusting layer on the ambient light is reduced, and the appearance of the display panel is improved. In addition, the diffuse reflection surface can totally reflect at least part of the ambient light reflected by the partial structure of the light-emitting element to the black matrix, and the black matrix absorbs the part of the ambient light, so that the reflection effect of the display panel on the ambient light is further reduced.
Description
Technical Field
The invention relates to the field of display, in particular to a display panel, a manufacturing method of the display panel and a display device.
Background
In the manufacturing process of the display panel, a circular polarizer is usually arranged on the outer side of the display surface of the display panel, so as to reduce the luminous flux of ambient light entering the display panel, and further alleviate the problem of color shift or contrast caused by the reflection of the ambient light in the display panel.
The circular polarizer is usually thicker, which is not favorable for the light and thin display panel. The inventors have found that the luminous flux of ambient light entering the display panel can be reduced by the black matrix and filter structure instead of the circular polarizer. However, the black matrix and the filter structure still have a certain reflectivity, which affects the appearance of the display panel.
Disclosure of Invention
The invention provides a display panel, a manufacturing method of the display panel and a display device, which further improve the appearance of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, which includes: a substrate; a light emitting element layer on the substrate, the light emitting element layer including a plurality of light emitting elements; and the light adjusting layer is positioned on the light emergent side of the light emitting element layer and comprises a black matrix and a plurality of light filtering units, the black matrix comprises a plurality of openings, at least part of each light filtering unit is arranged in each opening, the plurality of light filtering units correspond to the plurality of light emitting elements respectively, and the surface of at least part of the light filtering units, which deviates from the light emitting element layer, is a diffuse reflection surface.
According to an aspect of the embodiment of the present invention, the black matrix includes a first surface facing away from the light emitting element layer, and a portion of the filter unit is provided to be raised with respect to the first surface.
According to an aspect of an embodiment of the present invention, the black matrix includes a protrusion structure disposed on the first surface.
According to an aspect of an embodiment of the present invention, the thickness of the filter unit is 1 to 4 micrometers, and the flatness of the diffusive reflective surface is 0.025 to 1.1 micrometers.
According to an aspect of the embodiments of the present invention, a first orthographic projection of the filter unit on the substrate covers a second orthographic projection of a boundary of the corresponding opening on the substrate; the size of the first orthographic projection is larger than the size of the second orthographic projection of the corresponding opening.
According to an aspect of the embodiment of the present invention, the first orthographic projection outline and the corresponding opening second orthographic projection outline are similar figures, and the first orthographic projection outline and the corresponding opening second orthographic projection outline have a spacing of greater than or equal to 2 microns.
According to an aspect of the embodiment of the present invention, the light adjusting layer further includes a light-transmitting protective layer, which is located on a side of the black matrix away from the light emitting element layer and covers the black matrix and the plurality of filter units.
According to an aspect of an embodiment of the present invention, the display panel further includes: and the packaging layer is positioned on one side of the light-emitting element layer, which is far away from the substrate, and the light adjusting layer is positioned on one side of the packaging layer, which is far away from the substrate.
According to an aspect of the embodiments of the present invention, the plurality of light emitting elements include a plurality of kinds of different colors, and the plurality of filter units include a plurality of kinds of different colors, wherein colors between the filter units corresponding to the positions and the light emitting elements are the same.
In a second aspect, an embodiment of the present invention provides a display device, which includes the display panel of any one of the foregoing embodiments.
In a third aspect, an embodiment of the present invention provides a method for manufacturing a display panel, including: forming a light emitting element layer on a substrate; and forming an optical adjustment layer on one side in a thickness direction of the light emitting element layer, wherein the forming of the optical adjustment layer on the one side in the thickness direction of the light emitting element layer includes: forming a black matrix on one side of the thickness direction of the light-emitting element layer, wherein the black matrix comprises a plurality of openings; coating a liquid filtering material on the surface of one side of the black matrix, which is far away from the light-emitting element layer, wherein the liquid filtering material covers at least part of the opening of the black matrix; standing to enable the surface of the liquid filtering material, which is far away from the light-emitting element layer, to generate a collapse structure; and solidifying the liquid filtering material to obtain the filtering unit.
According to the display panel provided by the embodiment of the invention, the optical adjusting layer of the display panel comprises the black matrix and the plurality of filtering units, wherein the surface of at least part of the filtering units, which is far away from the light-emitting element layer, is a diffuse reflection surface, so that the reflection effect of the optical adjusting layer on ambient light is reduced, the contrast ratio of the display panel during display is improved, and the appearance of the display panel is improved. In addition, the diffuse reflection surface can totally reflect at least part of the ambient light reflected by the partial structure of the light-emitting element to the black matrix, and the black matrix absorbs the part of the ambient light, so that the reflection effect of the display panel on the ambient light is further reduced.
In some optional embodiments, the black matrix includes a protrusion structure disposed on the first surface, so as to improve an absorption rate of light diffusely reflected by the diffuse reflection surface and light totally reflected by the diffuse reflection surface, and further reduce a reflection effect of the light adjustment layer on ambient light.
In some optional embodiments, the light adjusting layer further includes a light transmissive protective layer covering the black matrix and the plurality of light filtering units to prevent the black matrix and the plurality of light filtering units from being scratched. When the display panel is bendable, the light-transmitting protective layer can prevent the black matrix from being separated from the plurality of light filtering units, and the stability of the light adjusting layer is improved.
According to the manufacturing method of the display panel, after the liquid filtering material is coated on the surface of one side, away from the light-emitting element layer, of the black matrix, the display panel is placed still, so that a part of the liquid filtering material flows into the opening of the black matrix to generate a collapse structure on the surface, away from the light-emitting element layer. After the liquid filtering material is coated and cured, the collapsed structure is cured to form a diffuse reflection surface, so that the reflection effect of the light adjusting layer on ambient light is reduced, and the appearance of the display panel is improved.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.
Fig. 1 shows a top view of a display panel according to a first embodiment of the invention;
FIG. 2 shows a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic diagram showing an optical path of a light adjusting layer in a display panel according to a first embodiment of the present invention when the light adjusting layer is irradiated by ambient light;
FIG. 4 is a graph showing the reflectance of the light conditioning layer of the display panel and the wavelength of the illuminating light for a display panel of a comparative example;
FIG. 5 shows a schematic projection of a portion of the structure of region Q of FIG. 1 onto a substrate;
fig. 6 shows a top view of a display panel according to a second embodiment of the invention;
FIG. 7 shows a cross-sectional view taken along line B-B of FIG. 6;
fig. 8 is a flowchart showing a method of manufacturing a display panel according to the first embodiment of the present invention;
fig. 9 is a flowchart illustrating a step of forming an optical adjustment layer in the method of manufacturing a display panel according to the first embodiment of the present invention.
In the figure:
1000-a display panel;
100-a substrate;
200-a light emitting element layer; 210-a light emitting element; 211-a first electrode; 212-a light emitting structure; 213-a second electrode; 220-pixel definition layer;
300-an optical modifier layer; 310-black matrix; 310 a-a first surface; 311s — second orthographic projection; 311-an opening; 312-raised structures; 320-a filtering unit; 320 s-first orthographic projection; 321-a diffusive reflective surface; 330-light-transmitting protective layer;
400-a device layer;
500-an encapsulation layer;
l1 — ambient light; l2 — ambient light reflected by the light emitting element layer;
w is the distance between the outline of the first orthographic projection and the outline of the second orthographic projection of the corresponding opening;
2000-display panel of comparative example.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Embodiments of the present invention provide a display panel, which may be an Organic Light Emitting Diode (OLED) display panel. Hereinafter, a display panel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 shows a top view of a display panel according to a first embodiment of the present invention, and fig. 2 shows a cross-sectional view taken along a-a in fig. 1. The display panel 1000 according to the first embodiment of the present invention includes a substrate 100, a light emitting device layer 200, and a light adjusting layer 300.
The substrate 100 may be a substrate made of glass, and in some embodiments, may also be a substrate made of Polyimide (PI) material or a material containing PI, so that the substrate 100 may be bent.
The light emitting element layer 200 is located on the substrate 100. The light emitting element layer 200 includes a plurality of light emitting elements 210. In some embodiments, the light emitting device layer 200 includes a pixel defining layer 220, the pixel defining layer 220 has a plurality of pixel openings thereon, and the plurality of light emitting devices 210 are respectively disposed corresponding to the plurality of pixel openings. Here, the light-emitting element 210 is exemplified as an OLED light-emitting element. The light emitting element 210 includes a first electrode 211, a light emitting structure 212 on the first electrode 211, and a second electrode 213 on the light emitting structure 212. In some embodiments, the first electrode 211 is an anode of the light emitting element 210, the second electrode 213 is a cathode of the light emitting element 210, and the second electrodes 213 of the plurality of light emitting elements 210 may be interconnected as a common electrode.
The light adjusting layer 300 is located on the light emitting side of the light emitting device layer 200. The optical adjustment layer 300 includes a Black Matrix (BM) 310 and a plurality of filter units 320. The filter unit 320 is a Color Filter (CF). The black matrix 310 includes a plurality of openings 311, at least a portion of each of the filter units 320 is disposed in the openings 311, and the filter units 320 correspond to the light emitting elements 210 respectively. When the display panel 1000 is irradiated by the ambient light, the black matrix 310 can absorb a portion of the ambient light, and the filtering unit 320 can filter a portion of the ambient light, so as to reduce the luminous flux of the ambient light irradiated to the light emitting device layer 200, further reduce the ambient light reflected by the light emitting device 210, and reduce the adverse effect of the ambient light on the aspects of color calibration, contrast ratio, and the like of the display panel.
According to the display panel 1000 of the first embodiment of the present invention, each of the filter units 320 has a surface facing the light emitting element layer 200 and a surface facing away from the light emitting element layer 200, wherein at least a part of the surface of the filter unit 320 facing away from the light emitting element layer 200 is the diffuse reflection surface 321. The diffuse reflection surface 321, i.e., the uneven surface, may be obtained by roughening.
Fig. 3 is a schematic diagram showing an optical path of a light adjustment layer in a display panel according to a first embodiment of the present invention when the light adjustment layer is irradiated by ambient light. In the figure, the optical path of the external ambient light L1 is shown by a solid line with an arrow, and the optical path of the ambient light L2 reflected by the light-emitting element layer 200 is shown by a broken line with an arrow.
When the external ambient light L1 irradiates the optical adjustment layer 300, a part of the external ambient light L1 is diffusely reflected at the diffuse reflection surface 321 of the filtering unit 320, so as to reduce the reflection effect of the optical adjustment layer 300 on the external ambient light L1, improve the contrast when the display panel 1000 displays, and improve the appearance of the display panel 1000. In addition, the diffuse reflection surface 321 can totally reflect at least part of the ambient light L2 reflected by the light emitting element layer 200 to the black matrix 310, and the black matrix 310 absorbs the part of the light, thereby further reducing the reflection effect of the display panel 1000 on the ambient light.
In some embodiments, the thickness of the filtering unit 320 is 1 micron to 4 microns, wherein the flatness of the diffuse reflection surface 321 is 0.025 micron to 1.1 micron, so that the degree of the unevenness of the diffuse reflection surface 321 meets a proper flatness requirement, the diffuse reflection capability of the diffuse reflection surface 321 is improved under a certain thickness of the filtering unit 320, the reflection effect of the display panel on the ambient light observed by human eyes is reduced, and the display effect is improved.
FIG. 4 shows a graph of reflectance versus wavelength of illumination light for an optical modifier layer of a display panel 1000 and for an optical modifier layer of a display panel 2000 in a comparative example. In the display panel 1000 according to an embodiment of the present invention, the thickness of the filtering unit 320 of the optical adjusting layer 300 is 2 microns, and the flatness of the diffuse reflection surface 321 is substantially 0.1 micron; in the display panel 2000 of the comparative example, the light adjusting layer was a circular polarizer having a thickness of 66 μm, and the other structure was the same as that of the display panel 1000 of the embodiment of the present invention. The data results may be obtained by spectroscopic testing. Among them, the average reflectance of the optical adjustment layers of the display panel 2000 of the comparative example was 5.16%, and the average reflectance of the optical adjustment layers of the display panel 1000 of one embodiment of the present invention was 4.78%. As can be seen, according to the display panel 1000 of the embodiment of the invention, the average reflectivity of the improved optical modifier layer 300 to the external environment light can be reduced to be lower than the average reflectivity of the circular polarizer to the external environment light, so that the display panel can replace the circular polarizer, and the adverse effects of the environmental light on the aspects of the color accuracy, the contrast ratio, and the like of the display panel can be reduced.
In some embodiments, the display panel 1000 further includes a device layer 400 and an encapsulation layer 500. The device layer 400 is located between the substrate 100 and the light emitting element layer 200. The device layer 400 may include pixel circuits electrically connected to the light emitting elements 210 of the light emitting element layer 200 for driving the light emitting elements 210 to display.
The encapsulation layer 500 is located on a side of the light emitting element layer 200 facing away from the substrate 100. In this embodiment, the display panel 1000 is a top emission display panel, that is, the side of the light emitting device layer 200 facing the encapsulation layer 500 is a light emitting side. The light adjusting layer 300 of the present embodiment is located on a side of the encapsulation layer 500 away from the substrate 100.
In some other embodiments, the display panel 1000 is a bottom emission display panel, i.e., the side of the light emitting device layer 200 facing the substrate 100 is the light emitting side. The light adjustment layer 300 may be provided on the side of the light-emitting element layer 200 facing the substrate 100, and the light adjustment layer 300 may be in contact with the light-emitting element layer 200, or may be provided with another layer directly interposed therebetween. For example, in some embodiments, the device layer 400 and the substrate 100 are disposed between the light emitting element layer 200 and the light modulation layer 300.
In some embodiments, the plurality of light-emitting elements 210 comprises a plurality of different colors; the plurality of filter units 320 include a plurality of colors different from each other. The color of the filter unit 320 corresponding to the position is the same as that of the light emitting element 210.
Specifically, the plurality of light emitting elements 210 may include a red light emitting element, a green light emitting element, and a blue light emitting element, and the plurality of light emitting elements 210 may be arranged in a predetermined regular array. In one example, the light-emitting element 210 on the left side in fig. 2 is a red light-emitting element, the light-emitting element 210 in the middle is a green light-emitting element, and the light-emitting element 210 on the right side is a blue light-emitting element.
The plurality of filter units 320 include a red filter unit, a green filter unit, and a blue filter unit, and the arrangement rule of the plurality of filter units 320 is correspondingly matched with the arrangement rule of the plurality of light emitting elements 210. In one example, the filter unit 320 on the left side in fig. 2 is a red filter unit, the filter unit 320 on the middle side is a green filter unit, and the filter unit 320 on the right side is a blue filter unit, so that the color between the filter unit 320 and the light emitting element 210 corresponding to the position is the same.
In some embodiments, the black matrix 310 includes a first surface 310a facing away from the light emitting element layer 200, and a portion of the filtering unit 320 is disposed to be raised with respect to the first surface 310 a.
Fig. 5 shows a projection of a partial structure of the region Q of fig. 1 onto a substrate. In some embodiments, a first orthographic projection 320s of the filtering unit 320 on the substrate 100 covers a second orthographic projection 311s of the boundary of the corresponding opening 311 on the substrate 100. Further, the size of the first orthographic projection 320s is larger than the size 311s of the second orthographic projection of the corresponding opening 311. In some embodiments, the outline of the first orthogonal projection 320s and the outline of the second orthogonal projection 311s corresponding to the opening 311 are similar, in this embodiment, both are square, and in other embodiments, the outline of the first orthogonal projection 320s and the outline of the second orthogonal projection 311s corresponding to the opening 311 may be rectangular, circular, oval, or other shapes.
In some embodiments, the outer contour of the first orthographic projection 320s has a spacing W from the contour of the second orthographic projection 311s corresponding to the opening 311, wherein the spacing W is greater than or equal to 2 microns.
With continued reference to fig. 2, in some embodiments, the optical modifier layer 300 further includes a light transmissive protective layer 330. The light-transmissive protective layer 330 may be made of a transparent material. The light-transmitting protection layer 330 is located on a side of the black matrix 310 away from the light-emitting device layer 200, and covers the black matrix 310 and the plurality of filtering units 320, so as to prevent the black matrix 310 and the plurality of filtering units 320 from being scratched. When the display panel 1000 is bendable, the light-transmitting protection layer 330 can prevent the black matrix 310 from being separated from the plurality of filter units 320, thereby improving the stability of the light adjusting layer 300.
Fig. 6 illustrates a top view of a display panel according to a second embodiment of the present invention, and fig. 7 illustrates a cross-sectional view taken along the direction B-B in fig. 6. The partial structure of the display panel 1000 of the second embodiment is the same as that of the display panel 1000 of the first embodiment, and only the differences therebetween will be described below, and the details of the same parts will not be described.
Unlike the first embodiment, in the present embodiment, the black matrix 310 includes the protrusion structures 312 disposed on the first surface 310 a. The convex structures 312 are located between adjacent filter units 320. In this embodiment, a projection of the protruding structure 312 on the substrate 100 is illustrated as a mesh. In some other embodiments, the protruding structures 312 may be a plurality of bumps dispersed between adjacent filter units 320, wherein the shape of the bumps is arbitrary. The plurality of bumps may be arranged in an array or other regular manner between adjacent filter units 320, or may be irregularly arranged between adjacent filter units 320.
According to the display panel 1000 of the embodiment, the black matrix 310 includes the protrusion structure 312 disposed on the first surface 310a, so as to improve the absorption rate of the light diffusely reflected by the diffuse reflection surface 321 and the light totally reflected by the diffuse reflection surface 321, and further reduce the reflection effect of the optical adjustment layer 300 on the ambient light.
An embodiment of the present invention further provides a display device, which includes the display panel 1000 according to any one of the above embodiments. According to the display device of the embodiment of the invention, the optical adjustment layer 300 of the display panel 1000 includes the black matrix 310 and the plurality of filtering units 320, wherein at least a part of the filtering units 320 is a diffuse reflection surface 321 on a surface away from the light emitting element layer 200, so as to reduce a reflection effect of the optical adjustment layer 300 on ambient light, improve a contrast ratio of the display panel 1000 during display, and improve an appearance of the display panel 1000. In addition, the diffuse reflection surface 321 can totally reflect at least part of the ambient light reflected by the partial structure of the light emitting element 210 to the black matrix 310, and the black matrix 310 absorbs the part of the ambient light, thereby further reducing the reflection effect of the display panel 1000 on the ambient light.
The embodiment of the present invention further provides a manufacturing method of a display panel, which will be described below by taking the manufacturing process of the display panel 1000 of the first embodiment as an example.
Fig. 8 is a flowchart illustrating a method of fabricating a display panel according to a first embodiment of the present invention, the method including steps S110 to S130.
In step S110, a device layer and a light-emitting element layer are formed over a substrate. The light emitting element layer may include a pixel defining layer and a plurality of light emitting elements, such as OLED light emitting elements.
In step S120, an encapsulation layer is formed on the light emitting element layer. The encapsulation layer may be a thin film encapsulation layer.
In step S130, an optical adjustment layer is formed on one side in the thickness direction of the light-emitting element layer. In this embodiment, the display panel is a top emission display panel, and a side of the light emitting device layer facing the encapsulation layer is a light emitting side, wherein the light adjusting layer is formed on the encapsulation layer.
Fig. 9 is a flowchart illustrating a step of forming an optical adjustment layer in the method of manufacturing a display panel according to the first embodiment of the present invention. The above-mentioned step S130 may include steps S131 to S135.
In step S131, a black matrix is formed on one side in the thickness direction of the light emitting element layer, wherein the black matrix is formed on the encapsulation layer in this embodiment. The black matrix may be patterned to form a plurality of openings. In some embodiments, the black matrix may be patterned again such that a side surface thereof facing away from the light emitting element layer forms a protrusion structure. The patterning process of the black matrix may select a photolithography process, and then the patterned black matrix is cured by baking.
In step S132, a liquid filter material is coated on a surface of the black matrix facing away from the light emitting device layer, where the liquid filter material may be a band-pass transmissive photosensitive material, such as polyvinyl alcohol (PVA) or other photosensitive polymer material. The liquid filter material covers at least part of the openings of the black matrix. In some embodiments, the size of the orthographic projection of the liquid filter material on the substrate is larger than the size of the opening of the corresponding black matrix.
In step S133, the liquid filter material is left standing so that a surface of the liquid filter material facing away from the light emitting element layer generates a collapsed structure. In some embodiments, after step S132 is completed, the display panel may be left to stand at room temperature (20 ℃ to 25 ℃) for 2 minutes to 5 minutes, for example, 3 minutes, in step S133, so that a portion of the liquid filter material flows into the opening of the black matrix to generate a collapsed structure on the surface facing away from the light emitting element layer.
In step S134, the liquid filter material is cured to obtain a filter unit. The curing of the liquid filter material may be a process of developing by exposure. In some embodiments, the exposure is performed with a high dose of light (e.g., light having a wavelength of 405 nanometers at a dose of 400 mj/cm or more) and the development is guaranteed to be residue free and not over developed.
According to the manufacturing method of the display panel, after the liquid filtering material is coated on the surface of one side, away from the light-emitting element layer, of the black matrix, the display panel is placed still, so that a part of the liquid filtering material flows into the opening of the black matrix to generate a collapse structure on the surface, away from the light-emitting element layer. After the liquid filtering material is coated and cured, the collapsed structure is cured to form a diffuse reflection surface, so that the reflection effect of the light adjusting layer on ambient light is reduced, and the appearance of the display panel is improved. In some embodiments, the liquid filter material is exposed to a high dose of light and is guaranteed to be developed without residue and without excessive development, thereby ensuring that the collapsed structure is not flattened by the development process and obtaining a diffuse reflection surface with better diffuse reflection effect.
In some embodiments, after the step S134, the step of forming the optical adjustment layer may further include a step S135 of forming a light-transmitting protection layer on a side of the black matrix away from the light-emitting element layer. Wherein the light-transmitting protective layer covers the black matrix and the plurality of light-filtering units. In some embodiments, the light-transmitting protective layer may be formed by spin-coating a liquid light-transmitting adhesive on a side of the black matrix away from the light-emitting device layer, and then performing photolithography, curing, and the like to obtain the light-transmitting protective layer.
The light-transmitting protective layer can prevent the black matrix and the plurality of light filtering units from being scratched. When the display panel is bendable, the light-transmitting protective layer can prevent the black matrix from being separated from the plurality of light filtering units, and the stability of the light adjusting layer is improved.
In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A display panel, comprising:
a substrate;
a light emitting element layer on the substrate, the light emitting element layer including a plurality of light emitting elements;
the light adjusting layer is positioned on the light outlet side of the light emitting element layer and comprises a black matrix and a plurality of light filtering units, the black matrix comprises a plurality of openings, at least part of each light filtering unit is arranged in each opening, the light filtering units correspond to the light emitting element in position respectively, the black matrix comprises a first surface deviating from the light emitting element layer, one part of each light filtering unit is arranged relative to the first surface in a raised mode, and at least part of the surface deviating from the light emitting element layer of each light filtering unit is a diffuse reflection surface;
the black matrix comprises a protruding structure arranged on the first surface, and the projection of the protruding structure on the substrate is in a net shape.
2. The display panel according to claim 1, wherein the thickness of the filter unit is 1 to 4 μm, and the flatness of the diffusive reflective surface is 0.025 to 1.1 μm.
3. The display panel according to claim 1, wherein a first orthographic projection of the filter unit on the substrate covers a second orthographic projection of a boundary corresponding to the opening on the substrate;
the size of the first orthographic projection is larger than the size of the second orthographic projection corresponding to the opening.
4. The display panel according to claim 3, wherein the outline of the first orthographic projection and the outline of the second orthographic projection corresponding to the opening are similar figures, and the interval between the outline of the first orthographic projection and the outline of the second orthographic projection corresponding to the opening is greater than or equal to 2 microns.
5. The display panel according to claim 1, wherein the light adjustment layer further comprises a light-transmissive protective layer which is located on a side of the black matrix facing away from the light-emitting element layer and covers the black matrix and the plurality of filter units.
6. The display panel according to claim 1, characterized in that the display panel further comprises:
an encapsulation layer on a side of the light emitting element layer facing away from the substrate,
the optical adjusting layer is located on one side of the packaging layer, which is far away from the substrate.
7. The display panel according to claim 1, wherein the plurality of light emitting elements include a plurality of types of colors, and the plurality of filter units include a plurality of types of colors, and wherein the color is the same between the filter units and the light emitting elements at corresponding positions.
8. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
9. A method for manufacturing a display panel according to any one of claims 1 to 7, comprising:
forming a light emitting element layer on a substrate; and
an optical adjustment layer is formed on one side in the thickness direction of the light emitting element layer,
wherein the forming of the light adjusting layer on one side in the thickness direction of the light emitting element layer includes:
forming a black matrix on one side of the thickness direction of the light-emitting element layer, wherein the black matrix comprises a plurality of openings;
coating a liquid light filtering material on the surface of one side of the black matrix, which is far away from the light-emitting element layer, wherein the liquid light filtering material covers at least part of the opening of the black matrix;
standing to enable the surface of the liquid light filtering material, which is far away from the light-emitting element layer, to generate a collapse structure; and
and solidifying the liquid filtering material to obtain the filtering unit.
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| CN110854256B (en) * | 2019-11-27 | 2022-04-05 | 成都辰显光电有限公司 | Display panel and display device |
| CN113054136B (en) * | 2021-03-11 | 2022-07-12 | 武汉华星光电半导体显示技术有限公司 | Organic light emitting display panel and display device |
| GB2610499A (en) * | 2021-03-26 | 2023-03-08 | Boe Technology Group Co Ltd | Display panel |
| CN113690390A (en) * | 2021-08-23 | 2021-11-23 | 京东方科技集团股份有限公司 | Display panel, preparation method thereof and display device |
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