CN113193152B - Display substrate and display device - Google Patents
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- CN113193152B CN113193152B CN202110476366.6A CN202110476366A CN113193152B CN 113193152 B CN113193152 B CN 113193152B CN 202110476366 A CN202110476366 A CN 202110476366A CN 113193152 B CN113193152 B CN 113193152B
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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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
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- H10K50/85—Arrangements for extracting light from the devices
- H10K50/856—Arrangements for extracting light from the devices comprising reflective means
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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
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- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
The application provides a display substrate and a display device, wherein the display substrate comprises a base and a display functional layer, and the display functional layer comprises a plurality of luminous sub-pixels which are arranged in an array manner; at least one circle of protruding structures are arranged above each light-emitting sub-pixel, and each protruding structure comprises a plurality of sub-protruding structures; in the luminescent sub-pixels with the same luminescent color, at least two of the luminescent sub-pixels respectively correspond to the projection patterns of the convex structures on the display functional layer; the planarization layer covers the bump structure, and the refractive index of the planarization layer is greater than the refractive index of the bump structure. The total reflection interface of emergent rays is increased by arranging at least one circle of protruding structures on the display functional layer, so that the light-emitting efficiency is improved; the plurality of sub-bulge structures arranged at intervals can increase the brightness of side light, so that the problem of large-view character deviation is solved; the convex structures corresponding to at least part of the luminous sub-pixels in the luminous sub-pixels with the same luminous color are different, so that the luminous uniformity of the display panel is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a display substrate and a display device.
Background
An OLED (organic electroluminescent diode) display substrate is a multi-layer structure including an OLED light emitting layer. Each of the film layers in the OLED display substrate includes different materials and has different refractive indices.
However, the inventor of the present application found that, since each film layer in the existing OLED display substrate has a different refractive index, a portion of light emitted by the light emitting layer is reflected or totally reflected at the interface between the low refractive index film layer and the high refractive index film layer, so that the front light extraction efficiency of the display substrate is reduced.
In the prior art, a display substrate is formed by opening a low refractive index film layer around a pixel opening area and covering the low refractive index film layer with a high refractive index film layer, so as to improve the front light extraction efficiency. However, the film structure may have a problem of color shift at a large viewing angle, and may affect the uniformity of light output from the entire display substrate.
Disclosure of Invention
The application provides a display substrate and a display device aiming at the defects of the existing mode, so as to solve the problems of large-viewing-angle color cast and reduced light emitting uniformity in the existing OLED display substrate.
In a first aspect, embodiments of the present application provide a display substrate, including: a substrate, a display function layer, a bump structure and a planarization layer; the display functional layer is positioned on one side of the substrate and comprises a plurality of light-emitting sub-pixels which are arranged in an array manner, and each light-emitting sub-pixel is provided with a pixel opening area; at least one circle of protruding structures are arranged on one side, far away from the display function layer, of the light-emitting sub-pixel, and each protruding structure comprises a plurality of sub-protruding structures which are arranged at intervals along the circumferential direction of the pixel opening area; in the light-emitting sub-pixels with the same light-emitting color, at least two light-emitting sub-pixels respectively correspond to the projection structures, and orthographic projection patterns of the projection structures on the display functional layer are different; the planarization layer covers the raised structures, and the refractive index of the planarization layer is greater than the refractive index of the raised structures.
Optionally, the display substrate includes a circle of first protruding structures, where the first protruding structures are the protruding structures closest to the pixel opening area; the first protruding structures are discontinuous annular structures, the first protruding structures comprise a plurality of first sub-protruding structures, and the pixel opening areas are surrounded by the first sub-protruding structures; a first sub-opening area is arranged between the adjacent first sub-bulge structures, and the first sub-opening area enables the first bulge structures to be discontinuous; in each light-emitting sub-pixel with the same light-emitting color, at least two light-emitting sub-pixels respectively correspond to the orthographic projection patterns of the first convex structures on the display functional layer.
Optionally, the display substrate further comprises a circle of second protruding structures in addition to the circle of first protruding structures, the second protruding structures surrounding the first protruding structures; the second protruding structures are discontinuous annular structures, each second protruding structure comprises a plurality of second sub-protruding structures, second sub-opening areas are arranged between every two adjacent second sub-protruding structures, and the second sub-opening areas enable the second protruding structures to be discontinuous.
Optionally, the second sub-bump structures and the first sub-bump structures are alternately arranged along the circumferential direction of the corresponding pixel opening area in a staggered manner, and the first sub-opening area is at least surrounded by the second sub-bump structures.
Optionally, the display substrate further includes a third bump structure in addition to the first bump structure and the second bump structure, the third bump structure surrounds the second bump structure, and an offset distance between the third bump structure and the second bump structure is equal to an offset distance between the second bump structure and the first bump structure.
Optionally, the third protrusion structure is a discontinuous annular structure, and the third protrusion structure includes a plurality of third sub-protrusion structures; a third sub-opening area is arranged between the adjacent third sub-protruding structures, and the third sub-opening area enables the third protruding structures to be discontinuous.
Optionally, the number and arrangement orientation of the third sub-protrusion structures and the first sub-protrusion structures along the circumferential direction of the pixel opening area are the same; the orthographic projection area of the third sub-opening area on the display substrate is smaller than the orthographic projection area of the first sub-opening area on the display substrate; the second sub-opening area is surrounded by at least the third sub-projection structure.
Optionally, a front projection area of an end of the first protruding structure, which is away from the display function layer, on the display function layer is located in a front projection area of an end of the first protruding structure, which is towards the display function layer, on the display function layer; one side of the first bulge structure, which is close to the light emitting direction of the light emitting sub-pixel, is an inclined surface.
Optionally, the display function layer includes a plurality of pixel units, each pixel unit includes three adjacent light emitting sub-pixels having different light emitting colors; in the same pixel unit, the orthographic projection patterns of the convex structures corresponding to the light-emitting sub-pixels with different light-emitting colors on the display functional layer are the same or partially the same.
In a second aspect, an embodiment of the present application further provides a display device, including the display substrate in the first aspect.
The beneficial technical effects brought by the technical scheme provided by the embodiment of the application at least comprise:
according to the display substrate provided by the embodiment of the application, through the arrangement of at least one circle of protruding structures, the total reflection interface of emergent rays can be increased, so that the front light-emitting efficiency is improved; each protrusion structure comprises a plurality of sub-protrusion structures circumferentially arranged along the pixel opening area, so that a part of emergent light can be directly emitted out through the planarization layer with higher refractive index without total reflection, the brightness of side light is increased, and the problem of color cast of a large viewing angle is solved; the projection patterns of the projection structures corresponding to at least part of the luminous sub-pixels in the same luminous color on the display functional layer are different, namely the luminous sub-pixels in the same luminous color have a plurality of light emitting angles in different directions, so that the light emitting uniformity of the display panel is improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic distribution diagram of a bump structure corresponding to a light emitting sub-pixel of a display substrate according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view along A-A of FIG. 1 provided in an embodiment of the present application;
FIG. 3 is a schematic cross-sectional view along B-B of FIG. 1 provided in an embodiment of the present application;
fig. 4 is a schematic distribution diagram of a bump structure corresponding to a light emitting sub-pixel of another display substrate according to an embodiment of the present disclosure;
fig. 5 is a schematic distribution diagram of a first bump structure corresponding to a light emitting sub-pixel of a display substrate according to an embodiment of the present application;
FIG. 6 is a schematic cross-sectional view along C-C of FIG. 5 provided in an embodiment of the present application;
fig. 7 is a schematic distribution diagram of a first bump structure corresponding to a light emitting sub-pixel of another display substrate according to an embodiment of the present disclosure;
fig. 8 is a schematic layout diagram of a light emitting sub-pixel and a corresponding first bump structure of a display substrate according to an embodiment of the present application;
Fig. 9 is a schematic layout diagram of a light emitting sub-pixel and a corresponding first bump structure of another display substrate according to an embodiment of the present disclosure;
fig. 10 is a schematic distribution diagram of a first bump structure and a second bump structure corresponding to a light emitting sub-pixel of a display substrate according to an embodiment of the present application;
fig. 11 is a schematic distribution diagram of a first bump structure and a second bump structure corresponding to a light emitting sub-pixel of another display substrate according to an embodiment of the present disclosure;
fig. 12 is a schematic layout diagram of a light emitting sub-pixel of a display substrate and corresponding first and second bump structures according to an embodiment of the present application;
fig. 13 is a schematic layout diagram of a light emitting sub-pixel and corresponding first and second bump structures of another display substrate according to an embodiment of the present disclosure;
fig. 14 is a schematic layout diagram of a light emitting sub-pixel of a display substrate and corresponding first and second bump structures according to another embodiment of the present disclosure;
fig. 15 is a schematic layout diagram of a light emitting sub-pixel of a display substrate and corresponding first and second bump structures according to still another embodiment of the present disclosure;
fig. 16 is a schematic distribution diagram of a first bump structure, a second bump structure, and a third bump structure corresponding to a light emitting sub-pixel of a display substrate according to an embodiment of the present application;
FIG. 17 is a schematic cross-sectional view along D-D of FIG. 16 provided in an embodiment of the present application;
fig. 18 is a schematic distribution diagram of a first bump structure, a second bump structure, and a third bump structure corresponding to a light emitting sub-pixel of another display substrate according to an embodiment of the present disclosure;
fig. 19 is a schematic layout diagram of a light emitting sub-pixel of a display substrate and corresponding first, second and third bump structures according to an embodiment of the present application;
fig. 20 is a schematic distribution diagram of a bump structure corresponding to a light emitting sub-pixel of a display substrate according to another embodiment of the present disclosure;
fig. 21 is a schematic distribution diagram of a bump structure corresponding to a light emitting sub-pixel of a display substrate according to another embodiment of the present disclosure.
Wherein:
100-light emitting sub-pixels; 100 a-pixel opening area;
110-a substrate; 120-display a functional layer; 121-a drive device layer; 122-a light emitting device layer; 123-an encapsulation layer;
200-bump structure; 200 a-sub-bump structure;
210-a first bump structure; 210 a-a first sub-bump structure; 210 b-a first sub-opening area;
220-a second bump structure; 220 a-a second sub-bump structure; 220 b-a second sub-opening area;
230-a third bump structure; 230 a-a third sub-bump structure; 230 b-a third sub-opening area;
300-planarization layer.
Detailed Description
Examples of embodiments of the present application are illustrated in the accompanying drawings, in which like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. Further, if detailed description of the known technology is not necessary for the illustrated features of the present application, it will be omitted. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present application and are not to be construed as limiting the present application.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
In the existing OLED display substrate, light convergence is achieved by setting a total reflection film layer structure on the encapsulation layer, where the total reflection film layer structure includes two refractive index films (a low refractive index film and a high refractive index film). The low refractive index film layer is provided with an opening area surrounding the sub-pixel opening area, and the high refractive index film layer covers the low refractive index film layer and the opening area. When the light emitted by the light-emitting layer is incident on the interface of the low-refractive-index film layer and the high-refractive-index film layer, the light is totally reflected on the interface due to the refractive index difference of the materials, and the light is converged, so that the front light-emitting efficiency of the OLED display substrate can be improved.
However, the inventors of the present application have found that, in the conventional total reflection film structure, the low refractive index film surrounding each light emitting sub-pixel has only one turn, and the improvement of the light emitting efficiency is limited. And when the display substrate is observed from the side, the display effect has a certain influence, and the problem of color cast exists, so that the side brightness is obviously darkened, and the light emitting uniformity is also influenced.
Accordingly, embodiments of the present application provide a display substrate and a display device to solve the above-mentioned disadvantages of the prior art.
The following describes the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems in detail with specific embodiments.
As shown in fig. 1 to 3, an embodiment of the present application provides a display substrate, including: a substrate 110, a display function layer 120, a bump structure 200, and a planarization layer 300. The base 110 may be a glass substrate or a polyimide substrate. The display function layer 120 is located on one side of the substrate 110, and the display area of the display function layer 120 includes a plurality of light emitting sub-pixels 100 arranged in an array, where each light emitting sub-pixel 100 has a corresponding pixel opening area 100a, and the pixel opening area 100a represents an effective light emitting area of the light emitting sub-pixel 100. The light emitting sub-Pixel 100 in the present embodiment is exemplified by a standard RGB Pixel, and Pixel in fig. 1 represents one light emitting sub-Pixel.
It should be noted that, in the embodiment of the present application, the display function layer 120 has a normal light emitting display function, and the display function layer 120 may specifically include a film structure such as a driving device layer 121, a light emitting device layer 122, and a packaging layer 123 on the substrate 110.
At least one circle of protruding structures 200 is disposed on a side of the light emitting sub-pixel 100 away from the display function layer 120, and the at least one circle of protruding structures 200 is located above the light emitting sub-pixel 100, which in the embodiment of the present application can be regarded as that the light emitting sub-pixel 100 corresponds to the at least one circle of protruding structures 200 above the light emitting sub-pixel 100. In this embodiment, the "upper side of the light-emitting sub-pixel 100" can be regarded as the side of the display function layer 120 away from the substrate 110, and the bump structure 200 is specifically disposed on the side of the encapsulation layer 123 included in the display function layer 120 away from the substrate 110.
Specifically, as shown in fig. 1, the protrusion structure 200 includes a plurality of sub-protrusion structures 200a, and the plurality of sub-protrusion structures 200a are arranged at intervals along the circumferential direction of the pixel opening area 100a of the light emitting sub-pixel 100, so that a portion of the emitted light of the light emitting sub-pixel 100 can be emitted through the interval area between the adjacent sub-protrusion structures 200a, thereby increasing the brightness of the emitted light at the side of the display substrate, and thus alleviating the problem of large viewing angle deviation.
Further, in all the light emitting sub-pixels 100 with the same light emitting color, at least two of the light emitting sub-pixels 100 respectively have different orthographic projection patterns of the corresponding bump structures 200 on the display function layer 120, which is equivalent to that at least some of the light emitting sub-pixels 100 with the same light emitting color have different bump structures 200 above the light emitting sub-pixels 100, so that the problem that the light brightness in a certain direction on the side of the display panel is too high or the light brightness in a certain direction is too low can be avoided.
For example: for all the red-emitting light emitting sub-pixels 100 (R sub-pixels), at least two of the R sub-pixels respectively correspond to the convex structures 200 having different orthographic projection patterns on the display function layer 120. Referring to fig. 1 and fig. 4, assuming that the light emission colors of the corresponding light emitting sub-pixels 100 in fig. 1 and fig. 4 are the same, the light emitting sub-pixels are all R sub-pixels emitting red light, in the two R sub-pixels, the convex structure 200 corresponding to one R sub-pixel is shown in fig. 1, the convex structure 200 corresponding to the other R sub-pixel is shown in fig. 4, and the front projection pattern of the convex structure 200 shown in fig. 1 on the display function layer 120 is different from the front projection pattern of the convex structure 200 shown in fig. 4 on the display function layer 120, so that the light emitting uniformity can be increased.
It should be noted that, in the present embodiment, the front projection patterns of the bump structures 200 on the display function layer 120 are different due to the different distribution positions of the sub-bump structures 200a of the bump structures 200 and/or different sizes of the spacing regions between the adjacent sub-bump structures 200 a.
Alternatively, in all the light emitting sub-pixels 100 of the same light emitting color, each corresponding bump structure 200 has two, three or four different orthographic projection patterns on the display function layer 120. In this embodiment, two different front projection patterns are exemplified, and the two different front projection patterns specifically refer to the structures shown in fig. 1 and fig. 4.
Alternatively, in all the light-emitting sub-pixels 100 with the same light-emitting color, the front projection patterns of the bump structures 200 corresponding to each light-emitting sub-pixel 100 on the display function layer 120 are different under the condition of process conditions.
Further, the bump structures 200 and the areas between the bump structures 200 in the embodiments of the present application are covered by the planarization layer 300, and the planarization layer 300 is flush with the side away from the substrate, so as to implement the planarization function. Specifically, the planarization layer 300 covers each sub-protrusion structure 200a of the protrusion structure 200 and the interval region between the adjacent sub-protrusion structures 200a, and a portion of the emitted light of the light-emitting sub-pixel 100 can be directly emitted through the planarization layer 300 through the interval region between the adjacent sub-protrusion structures 200 a.
In order to realize total reflection of the outgoing light of the light emitting sub-pixel 100, the refractive index of the planarization layer 300 needs to be larger than that of the bump structure 200, that is, when a part of the outgoing light of the light emitting sub-pixel 100 passes through the interface between the side surface of the bump structure 200 and the planarization layer 300, total reflection occurs, so as to achieve the effect of light convergence.
Optionally, the projecting structure 200 is located in a forward projection area on the display function layer 120 at an end facing away from the display function layer 120, in a forward projection area on the display function layer 120 at an end facing toward the display function layer 120; one side of the convex structure 200, which is close to the light emitting direction of the light emitting sub-pixel 100, is an inclined surface. In this embodiment, the cross section of the bump structure 200 along the direction perpendicular to the substrate 110 is a trapezoid structure, which is stable in structure and easy to manufacture.
Further, assuming that the angle between the side surface (inclined surface) of the bump structure 200 and the upper surface of the display function layer 120 is α, the refractive index of the bump structure 200 (or sub-bump structure 200 a) is n 1 The planarization layer 300 has a refractive index n 2 In order to achieve total reflection of the outgoing light, the angle α needs to satisfy the following conditions: arcsin (n) 1 /n 2 )<α<90 degrees.
Alternatively, the material of the bump structure 200 may be an organic material such as photoresist with a refractive index of 1.2-1.5, and the material of the planarization layer 300 may be a combination material of zirconia and an organic carrier with a refractive index of 1.5-1.8.
It is understood that, for the whole display function layer 120, at least one circle of the bump structures 200 may be disposed above each of the light emitting sub-pixels 100, or at least one circle of the bump structures 200 may be disposed above only a portion of the light emitting sub-pixels 100, so long as the functions of converging the light emitted by the pixels and expanding the viewing angle are provided, and the manner of disposing the bump structures 200 above the light emitting sub-pixels 100 is not specifically limited in this embodiment.
The display panel provided by the embodiment can increase the total reflection interface of emergent rays by arranging at least one circle of the convex structures 200, so that the front light-emitting efficiency is improved; each of the protrusion structures 200 includes a plurality of sub-protrusion structures 200a circumferentially arranged along the pixel opening area 100a, so that a portion of the outgoing light can be directly emitted through the planarization layer 300 having a higher refractive index without total reflection, and the brightness of the side light is increased, thereby alleviating the problem of color cast of a large viewing angle; the front projection patterns of the convex structures 200 corresponding to at least some light emitting sub-pixels 100 in the same light emitting color on the display functional layer 120 are different, that is, the light emitting sub-pixels 100 in the same light emitting color have light emitting angles in a plurality of different directions, so that the light emitting uniformity of the display panel is improved.
In some embodiments, as shown in fig. 5 and 6, the display panel in this embodiment includes a circle of first bump structures 210.
It should be noted that the display panel in this embodiment may include only one circle of the first bump structures 210, or may include other bump structures 200 except for one circle of the first bump structures 210, which is not particularly limited in this embodiment. In fig. 5, the periphery of the pixel opening area is only provided with a circle of first bump structures 210, and no other bump structures 200 are provided.
Specifically, as shown in fig. 5, the first bump structure 210 is a discontinuous ring-shaped structure, and the first bump structure 210 includes a plurality of first sub-bump structures 210a, and the plurality of first sub-bump structures 210a are arranged along the circumferential direction of the pixel opening area 100a and surround the pixel opening area 100a. A first sub-opening area 210b is disposed between two adjacent first sub-protrusion structures 210a, and the first sub-opening area 210b makes the first protrusion structures 210 discontinuous. The area of the first sub-opening area 210b is covered by the planarization layer 300, so that a part of the side light is directly emitted from the planarization layer 300 without total reflection, thereby reducing the problem of large visual character deviation. The first sub-opening region 210b may be formed by an etching process, and the planarization layer 300 fills the first sub-opening region 210b while covering the first sub-protrusion structure 210 a.
It should be noted that, the "annular structure" in the present embodiment does not refer to a circular annular structure, but needs to be adaptively set according to the projection shape of the pixel opening area 100 a. For example: assuming that the projected shape of the pixel opening area 100a on the substrate 110 is hexagonal, the corresponding annular structure is also an approximately hexagonal structure, including but not limited to a discontinuous annular hexagonal structure. Assuming that the projected shape of the pixel opening area 100a on the substrate 110 is rectangular, the corresponding annular structure is also an approximately rectangular structure, for example: the first bump structure 210 includes four first sub-bump structures 210a, and the four first sub-bump structures 210a are arranged along the circumferential direction of the pixel opening area 100a, see fig. 5 and 7.
In order to improve the light emitting uniformity of the display panel, in each light emitting sub-pixel 100 with the same light emitting color, at least two of the light emitting sub-pixels 100 respectively correspond to different orthographic projection patterns of the first protrusion structures 210 on the display function layer 120, that is, in all the light emitting sub-pixels 100 with the same light emitting color, at least a part of the distribution positions of the first sub-protrusion structures 210a of the first protrusion structures 210 above the sub-pixels 100 and/or the areas of the first sub-opening regions 210b between the adjacent first sub-protrusion structures 210a are different, and in this embodiment, the first protrusion structures 210 with two different structures corresponding to the light emitting sub-pixels 100 with the same light emitting color are illustrated in fig. 5 and fig. 7.
In some alternative embodiments, as shown in fig. 8 and 9, the display function layer may be divided into a plurality of pixel units (not shown) in this embodiment, where each pixel unit includes three adjacent light emitting sub-pixels with different light emitting colors. For example: adjacent R sub-pixels (red light emitting), G sub-pixels (green light emitting), and B sub-pixels (blue light emitting) are used as one pixel unit.
As shown in fig. 8 and fig. 9, in the same pixel unit, the front projection patterns of the first bump structures 210 corresponding to the light emitting sub-pixels with different light emitting colors on the display functional layer may be all the same, for example: as shown in the figure, the corresponding first bump structures 210 above the R sub-pixel, the G sub-pixel, and the B sub-pixel in the same pixel unit are the same (i.e., the setting positions and the sizes of the sub-opening areas in the bump structures are the same), and the specific setting manner of the first bump structures 210 may be the setting manner in the foregoing embodiments, which is not described in detail herein.
Further, as illustrated in fig. 8 and 9, two standard RGB sub-pixel arrangements and corresponding first bump structures 210 are illustrated, wherein adjacent R sub-pixels, G sub-pixels, and B sub-pixels form a pixel unit. In fig. 8, each row of the light emitting sub-pixels 100 corresponds to the same front projection pattern of the first bump structure 210 on the display function layer 120, and the front projection patterns of the first bump structures 210 corresponding to the light emitting sub-pixels of adjacent rows on the display function layer 120 are different. In fig. 9, in the same row of light emitting sub-pixels, the front projection patterns of the first bump structures 210 corresponding to the pixel units in the adjacent columns on the display functional layer are different; in the same column of light emitting sub-pixels, the orthographic projection patterns of the first bump structures 210 corresponding to the pixel units of the adjacent rows on the display functional layer are also different.
In addition, the front projection patterns of the bump structures 200 corresponding to the light emitting sub-pixels 100 with different light emitting colors on the display function layer 120 may not be identical, for example: in the same pixel unit, the first bump structures 210 corresponding to the R sub-pixel and the B sub-pixel may be arranged in the same structure (see fig. 5), and the G sub-pixel corresponds to the first bump structure 210 in another arrangement (see fig. 7).
In some specific embodiments, as shown in fig. 10, in the display substrate provided in this embodiment, the bump structures 200 disposed correspondingly to the light emitting sub-pixel 100 include a circle of first bump structures 210 and a circle of second bump structures 220 (two circles of bump structures 200 in total), the first bump structures 210 and the second bump structures 220 are both located on a side of the display function layer 120 away from the substrate 110, the second bump structures 220 surround the first bump structures 210, and the second bump structures 220 are located on a side of the first bump structures 210 away from the pixel opening area 100 a.
Optionally, the second bump structure 220 is also trapezoidal in cross-section along a direction perpendicular to the substrate 110.
In fig. 10, the distance between the second bump structure 220 and the first bump structure 210 may be set according to actual display requirements, and in this embodiment, the specific distance may not be limited, so as to ensure that a portion of the outgoing light can be totally reflected at the interface between the side surface of the second bump structure 220 and the planarization layer 300.
Specifically, the specific arrangement manner of the first bump structure 210 in this embodiment may be set with reference to fig. 5 in the above-described embodiment.
Further, in fig. 10, the second protrusion structure 220 is a discontinuous ring structure, and the second protrusion structure 220 includes a plurality of second sub-protrusion structures 220a, which is equivalent to the arrangement of the plurality of second sub-protrusion structures 220a along the circumference of the plurality of first sub-protrusion structures 210a, such that the second protrusion structure 220 entirely surrounds the first protrusion structure 210. A second sub-opening area 220b is disposed between adjacent second sub-protrusion structures 220a, and the second sub-opening area 220b makes the second protrusion structures 220 discontinuous. The second sub-opening area 220b may be formed by an etching process, and the planarization layer 300 fills the second sub-opening area 220b while covering the second sub-protrusion structure 220 a.
It can be understood that, for the light emitting sub-pixels 100 with the same light emitting color, since the front projection patterns of the first bump structures 210 corresponding to the light emitting sub-pixels 100 on the display function layer 120 are different, whether the front projection patterns of the second bump structures 220 corresponding to the light emitting sub-pixels 100 on the display function layer 120 are the same or not, the front projection patterns of all the bump structures 200 corresponding to the light emitting sub-pixels 100 above the light emitting sub-pixels 100 on the display function layer 120 are still different.
Further, as shown in fig. 11, another arrangement manner of the second bump structure 220 is further illustrated in this embodiment, where the first bump structure 210 and the second bump structure 220 corresponding to the light emitting sub-pixel 100 with the same light emitting color in this embodiment may be respectively configured in two manners shown in fig. 10 and 11, and of course, the arrangement manners of the two bump structures 200 shown in fig. 10 and 11 may also be adjusted, for example, the positions and the sizes of the first sub-opening area 210b and/or the second sub-opening area 220b may be changed, so that the bump structures 200 have more arrangement manners, and the light emitting uniformity may be further improved.
In this embodiment, by arranging two circles of intermittently arranged convex structures 200 around the light-emitting sub-pixel 100, the number of total reflection interfaces of the outgoing light rays of the light-emitting sub-pixel 100 is increased, so that the front light-emitting efficiency is improved; because the patterns of the orthographic projection of the convex structures 200 corresponding to the light-emitting sub-pixels 100 with the same light-emitting color on the display function layer 120 are different, the light-emitting color is more uniform, and the display performance of the display substrate is improved.
Alternatively, with continued reference to fig. 10 and 11, the second sub-protrusion structures 220a and the first sub-protrusion structures 210a are alternately arranged along the circumferential direction of the corresponding pixel opening area 100a in a staggered manner, that is, for one pixel opening area 100a, the second sub-protrusion structures 220a and the first sub-opening area 210b are arranged along the circumferential direction of the pixel opening area 100a, and at the same time, the second sub-opening area 220b and the first sub-protrusion structures 210a are also arranged along the circumferential direction of the pixel opening area 100 a.
Specifically, the first sub-opening area 210b is surrounded by at least the second sub-protrusion structure 220a, that is, the second sub-protrusion structure 220a corresponds to the position of the first sub-opening area 210b, and two ends of the second sub-protrusion structure 220a may overlap with orthographic projection portions of two adjacent first sub-protrusion structures 210a in a plane perpendicular to the display function layer, so that uneven brightness of light in the same direction may be avoided.
It is assumed that when the positions of the second sub-opening area 220b and the first sub-opening area 210b coincide, no total reflection occurs on the light rays at the same azimuth angle, resulting in a decrease in brightness of the light rays at the azimuth angle; and the light rays at the azimuth angle where the first sub-protrusion structure 210a and the second sub-protrusion structure 220a coincide all pass through total reflection, so that the brightness of the light rays at the azimuth angle is increased, thereby affecting the light emitting uniformity of the whole display substrate.
It should be noted that, in the embodiment of the present application, the "azimuth angle" is an azimuth angle set along the circumferential direction of the pixel opening area 100a with the center of the pixel opening area 100a as the origin, for example: the azimuth angle may be set to a plurality of intervals according to the number and size of the sub-protrusion structures 200a, and different intervals correspond to different sub-protrusion structures 200a or sub-opening areas.
In this embodiment, a part of the outgoing light rays with the same azimuth angle are directly emitted from the first sub-opening area 210b, and another part of the outgoing light rays can be emitted through total reflection at the interface between the second sub-protrusion structure 220a and the planarization layer 300, so that the outgoing light rays with the different azimuth angles are more uniform, and the problem of large-view character deviation of the display panel is reduced.
As shown in fig. 12 to 14, the light emitting sub-pixels 100 are arranged in a standard RGB manner, and in the same pixel unit (the R sub-pixel, the G sub-pixel, and the B sub-pixel are illustrated as adjacent in the drawing), the front projection patterns of the bump structures 200 corresponding to the light emitting sub-pixels 100 with different light emitting colors on the display function layer 120 may be all the same, for example: the corresponding protruding structures above the R sub-pixel, the G sub-pixel, and the B sub-pixel in the same pixel unit are the same (i.e., the setting positions and the sizes of the word opening areas in the protruding structures are the same), and the specific setting mode of the protruding structures may be the setting mode in the foregoing embodiments, which is not described in detail herein.
In some embodiments, as shown in fig. 10, 11 and 12, the light emitting sub-pixels 100 in fig. 12 are arranged in a standard RGB manner as an example, the front projection patterns of the bump structures corresponding to all the light emitting sub-pixels 100 in the same row on the display function layer are the same, and the bump structures corresponding to the light emitting sub-pixels 100 are arranged in the same manner in every interval row.
In some embodiments, as shown in fig. 10, 11 and 13, the light emitting sub-pixels 100 in fig. 13 are arranged in a standard RGB manner as an example, the front projection patterns of the bump structures corresponding to all the light emitting sub-pixels 100 in the same row on the display function layer are the same, and the bump structures corresponding to two rows of light emitting sub-pixels 100 are arranged in the same manner every interval. In addition, in this embodiment, the bump structures corresponding to the light emitting sub-pixels 100 may be arranged in the same manner every three or four rows.
In some embodiments, as shown in fig. 10, 11 and 14, the light emitting sub-pixels 100 in fig. 14 are arranged in a standard RGB manner as an example, in the same row of light emitting sub-pixels 100, the front projection patterns of the first bump structures 210 corresponding to the pixel units in adjacent columns on the display functional layer are different, and the front projection patterns of the corresponding second bump structures 220 on the display functional layer are also different; in the same column of the light emitting sub-pixels 100, the front projection patterns of the first bump structures 210 corresponding to the pixel units of the adjacent rows on the display function layer are also different, and the front projection patterns of the corresponding second bump structures 220 on the display function layer are also different.
In some embodiments, in the same pixel unit, the front projection patterns of the projection structures (including the first projection structure 210 and the second projection structure 220) corresponding to the light emitting sub-pixels 100 with different light emitting colors on the display function layer 120 may be partially the same, for example: as shown in fig. 10, 11 and 15, for the same pixel unit in fig. 15, the convex structures above the R sub-pixel and the B sub-pixel may be arranged in the same manner, and the convex structures above the G sub-pixel may be arranged in another different manner.
In some specific embodiments, as shown in fig. 16 and 17, in the display substrate provided in this embodiment, the bump structures 200 corresponding to the light emitting sub-pixels 100 are provided with three circles, namely, an innermost circle of first bump structures 210, an intermediate circle of second bump structures 220, and an outermost circle of third bump structures 230.
Optionally, the third bump structure 230 has a trapezoid shape in cross section along a direction perpendicular to the substrate 110.
Specifically, the first bump structure 210, the second bump structure 220, and the third sub-bump structure 230a are all located on a side of the display function layer 120 away from the substrate 110, and the second bump structure 220 surrounds the first bump structure 210, the third bump structure 230 surrounds the second bump structure 220, and the third bump structure 230 is located on a side of the second bump structure 220 away from the pixel opening area 100 a.
The specific structure and arrangement of the first protrusion structure 210 and the second protrusion structure 220 in this embodiment may refer to the content of the foregoing embodiment, and the description thereof will not be repeated here.
Further, in order to further increase the uniformity of light emission, the offset distance between the third protrusion structure 230 and the second protrusion structure 220 is equal to the offset distance between the second protrusion structure 220 and the first protrusion structure 210, and the specific offset amount may be set according to the size of the pixel opening area 100a and the actual display requirement, which is not specifically required in this embodiment.
Optionally, the third protrusion structure 230 is a discontinuous annular structure, the third protrusion structure 230 includes a plurality of third sub-protrusion structures 230a, and the plurality of third sub-protrusion structures 230a are circumferentially spaced along the plurality of second sub-protrusion structures 220a such that the third protrusion structure 230 entirely encloses the second protrusion structure 220. A third sub-opening area 230b is disposed between two adjacent third sub-protrusion structures 230a, and the third sub-opening area 230b makes the third protrusion structures 230 discontinuous. The third sub-opening region 230b may be formed by an etching process, and the planarization layer 300 fills the third sub-opening region 230b while covering the third sub-protrusion structure 230 a.
It can be understood that, for the light emitting sub-pixels 100 with the same light emitting color, since the front projection patterns of the first bump structures 210 and the second bump structures 220 corresponding to the light emitting sub-pixels 100 on the display function layer 120 are different, whether the front projection patterns of the third bump structures 230 corresponding to the light emitting sub-pixels 100 on the display function layer 120 are the same or not, the front projection patterns of all the bump structures 200 corresponding to the light emitting sub-pixels 100 above the light emitting sub-pixels 100 on the display function layer 120 are still different.
Further, as shown in fig. 18, another arrangement manner of the third bump structure 230 is also illustrated in this embodiment, where the first bump structure 210, the second bump structure 220, and the third bump structure 230 corresponding to the light emitting sub-pixel 100 with the same light emitting color in this embodiment may be respectively configured in two manners shown in fig. 16 and 18, and of course, the arrangement manner of the two bump structures 200 shown in fig. 16 and 18 may also be adjusted, for example, the positions and sizes of the second sub-opening area 220b and/or the third sub-opening area 230b may be changed, so that the bump structures 200 have more arrangement manners, and the light emitting uniformity may be further improved.
In some embodiments, as shown in fig. 19, in the pixel units in the same row (only one pixel unit is illustrated in each row in fig. 19), the front projection patterns of the bump structures 200 corresponding to the light emitting sub-pixels 100 (R sub-pixel, G sub-pixel, and B sub-pixel) on the display function layer 120 are the same, and the bump structures 200 corresponding to the light emitting sub-pixels 100 units in different rows are designed with different structures, so as to form multiple light emitting angle designs, so as to improve the light emitting uniformity of the display substrate.
In some embodiments, in the same pixel unit, the front projection patterns of the bump structures 200 corresponding to the light emitting sub-pixels 100 with different light emitting colors on the display function layer 120 may be partially the same, for example: in the same pixel unit, the same arrangement mode may be adopted for the bump structures 200 above the R sub-pixel and the B sub-pixel, and another different arrangement mode (not shown in fig. 19) may be adopted for the bump structures 200 corresponding to the G sub-pixel.
It should be noted that, the bump structure 200 in the present embodiment refers to an integral structure formed by the first bump structure 210, the second bump structure 220, and the third bump structure 230.
In this embodiment, by arranging three circles of intermittently arranged convex structures 200 around the light-emitting sub-pixel 100, the side light-emitting angle range of the outgoing light of the light-emitting sub-pixel 100 is further increased, and meanwhile, due to the further increase of the total reflection interface, the light-emitting efficiency of the front surface is improved; because the patterns of the orthographic projection of the convex structures 200 corresponding to the light-emitting sub-pixels 100 with the same light-emitting color on the display function layer 120 are different, the light-emitting color is more uniform, and the display performance of the display substrate is improved.
Alternatively, with continued reference to fig. 16 and 18, the number and arrangement orientation of the third sub-protrusion structures 230a and the first sub-protrusion structures 210a along the circumferential direction of the pixel opening area 100a are the same, i.e., the third sub-protrusion structures 230a may be regarded as structures in which the first sub-protrusion structures 210a are offset away from the pixel opening area 100a, and the same orientation of the third sub-protrusion structures 230a and the first sub-protrusion structures 210a have the same orthographic projected pattern on the display function layer 120, which are only different in size.
Specifically, for the same azimuth angle, the orthographic projection area of the third sub-projection structure 230a on the display substrate is larger than the orthographic projection area of the first sub-opening area 210b on the display substrate, and the orthographic projection area of the third sub-opening area 230b on the display substrate is smaller than the orthographic projection area of the first sub-opening area 210b on the display substrate.
Further, the second sub-opening area 220b is surrounded by at least the third sub-protrusion structure 230a, i.e. the third sub-protrusion structure 230a and the second sub-opening area 220b are arranged in the same direction along the circumferential direction of the pixel opening area 100a, while the third sub-opening area 230b and the second sub-protrusion structure 220a are also arranged in the same direction along the circumferential direction of the pixel opening area 100 a. The two ends of the third sub-protrusion structure 230a may partially overlap with the adjacent two second sub-protrusion structures 220a, so that uneven brightness of light in the same direction may be avoided. It is assumed that when the third sub-opening area 230b coincides with the positions of the second sub-opening area 220b and the first sub-opening area 210b, no total reflection occurs on the light rays at the same azimuth angle, resulting in a decrease in brightness of the light rays at the azimuth angle; the light rays at the azimuth angle where the first sub-protrusion structure 210a, the second sub-protrusion structure 220a and the third sub-protrusion structure 230a are overlapped are all totally reflected, so that the brightness of the light rays at the azimuth angle is increased, and the light emitting uniformity of the whole display substrate is affected.
In this embodiment, a part of the emergent light rays with the same azimuth angle are directly emitted from the first sub-opening area 210b and the third sub-opening area 230b, and another part of the emergent light rays can be emitted through the total reflection at the interface between the second sub-protrusion structure 220a and the planarization layer 300; or, a part of emergent light rays with the same azimuth angle are totally reflected and emitted through the interfaces of the first sub-convex structure 210a and the third sub-convex structure 230a and the planarization layer 300, and the other part of emergent light rays can be directly emitted through the second sub-opening area 220b, so that the emergent light rays with all azimuth angles are more uniform, and the problem of color cast of the display panel with a large viewing angle is solved; meanwhile, since the projection patterns of the convex structures 200 corresponding to the light emitting sub-pixels 100 with the same light emitting color are different, the light with the same light emitting color can be emitted from each angle of the side surface, and the uniformity of the emitted light is increased while the light emitting brightness of the side surface is improved.
In some embodiments, as shown in fig. 20, the bump structure 200 is tiled over the entire area except for the pixel opening area 100a, and the opening areas are provided for different orientations around the light emitting sub-pixel, and the opening areas corresponding to the bump structure 200 tiled front side are covered with a planarization layer. Wherein the gray portion is the bump structure 200 and the white is the open area. The distribution of the bump structures 200 shown in fig. 20 may be regarded as that a circle of sub-bump structures of the bump structures 200 are arranged around the pixel opening area, and the sub-bump structures corresponding to all the light-emitting sub-pixels are connected into a whole structure, and the structure may be prepared by combining the overall film forming and the patterning process, and removing the white portion in the figure.
In some embodiments, the orthographic projection shape of the sub-convex structures 200a of the convex structures on the display function layer is not limited to the elongated shape in fig. 1 and 4, but may include a circular shape, an oval shape, a triangular shape, or the like. As shown in fig. 21, fig. 21 illustrates an example in which the orthographic projection shape of the sub-bump structure 200a on the display function layer is a circle.
It should be noted that, the light emitting sub-pixels in the embodiments of the present application are not limited to the standard RGB arrangement, but may be applied to pixel arrangements such as "Zhou Dongyu arrangement", "pearl arrangement", and "diamond arrangement", and the design structures of the convex structures corresponding to these other pixel arrangements may be adjusted according to the projection shape of the pixel opening area 100a, and the specific arrangement manner of the convex structures in the embodiments is not described in detail.
Based on the same inventive concept, the embodiment of the application also provides a display device, which comprises the display substrate. The display device may be an electronic device such as a mobile phone, a tablet computer, a display, or a television.
The display device provided by the embodiment comprises the display substrate in the previous embodiment, and the display substrate can increase the total reflection interface of emergent rays by arranging at least one circle of convex structures, so that the front light-emitting efficiency is improved; each protrusion structure comprises a plurality of sub-protrusion structures circumferentially arranged along the pixel opening area, so that a part of emergent light can be directly emitted out through the planarization layer with higher refractive index without total reflection, the brightness of side light is increased, and the problem of color cast of a large viewing angle is solved; the projection patterns of the projection structures corresponding to at least part of the luminous sub-pixels in the same luminous color on the display functional layer are different, namely the luminous sub-pixels in the same luminous color have a plurality of light emitting angles in different directions, so that the light emitting uniformity of the display panel is improved.
In summary, embodiments of the present application have at least the following beneficial effects:
by arranging at least one circle of protruding structures above the light-emitting sub-pixels of the display substrate, the total reflection interface of emergent light rays can be increased, so that the front light-emitting efficiency is improved; each protrusion structure comprises a plurality of sub-protrusion structures circumferentially arranged along the pixel opening area, so that a part of emergent light can be directly emitted out through the planarization layer with higher refractive index without total reflection, the brightness of side light is increased, and the problem of color cast of a large viewing angle is solved; the projection patterns of the projection structures corresponding to at least part of the luminous sub-pixels in the same luminous color on the display functional layer are different, namely the luminous sub-pixels in the same luminous color have a plurality of light emitting angles in different directions, so that the light emitting uniformity of the display panel is improved.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (7)
1. A display substrate, comprising:
a substrate;
the display functional layer is positioned on one side of the substrate and comprises a plurality of light-emitting sub-pixels which are arranged in an array manner, and each light-emitting sub-pixel is provided with a pixel opening area;
at least one circle of protruding structures are arranged on one side, far away from the display function layer, of the light-emitting sub-pixels, and each protruding structure comprises a plurality of sub-protruding structures which are arranged at intervals along the circumferential direction of the pixel opening area; in the light-emitting sub-pixels with the same light-emitting color, at least two light-emitting sub-pixels respectively correspond to the projection structures, and orthographic projection patterns of the projection structures on the display functional layer are different;
a planarization layer covering the raised structures, the planarization layer having a refractive index greater than the refractive index of the raised structures;
comprises a circle of first bulge structures; the first protruding structures are discontinuous annular structures, the first protruding structures comprise a plurality of first sub-protruding structures, and the pixel opening areas are surrounded by the first sub-protruding structures; a first sub-opening area is arranged between the adjacent first sub-bulge structures, and the first sub-opening area enables the first bulge structures to be discontinuous; the orthographic projection area of one end, facing away from the display functional layer, of the first bulge structure on the display functional layer is positioned in the orthographic projection area of one end, facing towards the display functional layer, on the display functional layer; one side of the first bulge structure, which is close to the light emitting direction of the light emitting sub-pixel, is an inclined surface;
The pixel structure comprises a circle of second bulge structures, wherein the second bulge structures surround the first bulge structures, and the second bulge structures are positioned on one side of the first bulge structures, which is far away from the pixel opening area;
the second bulge structure is a discontinuous annular structure, the second bulge structure comprises a plurality of second sub-bulge structures, a second sub-opening area is arranged between every two adjacent second sub-bulge structures, and the second sub-opening area enables the second bulge structure to be discontinuous;
the second sub-protrusion structures and the first sub-protrusion structures are alternately arranged along the circumferential direction of the corresponding pixel opening area in a staggered manner, and the first sub-opening area is at least surrounded by the second sub-protrusion structures.
2. The display substrate according to claim 1, wherein in each of the light emitting sub-pixels having the same light emitting color, at least two of the light emitting sub-pixels respectively corresponding to the first projection structures have different orthographic projection patterns on the display function layer.
3. The display substrate of claim 2, further comprising a ring of third raised structures surrounding the second raised structures, the third raised structures being located on a side of the second raised structures remote from the pixel opening area;
The offset distance between the third protruding structure and the second protruding structure is equal to the offset distance between the second protruding structure and the first protruding structure.
4. A display substrate according to claim 3, wherein the third bump structure is a discontinuous ring structure, the third bump structure comprising a plurality of third sub-bump structures;
a third sub-opening area is arranged between the adjacent third sub-protruding structures, and the third sub-opening area enables the third protruding structures to be discontinuous.
5. The display substrate according to claim 4, wherein the number and arrangement orientation of the third sub-projection structures and the first sub-projection structures along the circumferential direction of the pixel opening area are the same;
the orthographic projection area of the third sub-opening area on the display substrate is smaller than the orthographic projection area of the first sub-opening area on the display substrate;
the second sub-opening area is surrounded by at least the third sub-projection structure.
6. The display substrate according to claim 1, wherein the display function layer comprises a plurality of pixel units, each pixel unit comprising three adjacent light-emitting sub-pixels having different light-emitting colors from each other;
In the same pixel unit, the orthographic projection patterns of the convex structures corresponding to the light-emitting sub-pixels with different light-emitting colors on the display functional layer are the same or partially the same.
7. A display device comprising the display substrate according to any one of claims 1 to 6.
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| CN114122080B (en) * | 2021-11-04 | 2023-04-07 | 武汉华星光电半导体显示技术有限公司 | Display panel and mobile terminal |
| CN114447253B (en) * | 2022-02-08 | 2024-03-19 | 京东方科技集团股份有限公司 | Display substrate, manufacturing method thereof and display device |
| CN117178657A (en) * | 2022-04-01 | 2023-12-05 | 京东方科技集团股份有限公司 | Display substrate and display device |
| WO2023245337A1 (en) * | 2022-06-20 | 2023-12-28 | 京东方科技集团股份有限公司 | Display panel and display device |
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