CN215600394U - Display substrate and display device - Google Patents

Abstract

The application provides a display substrate and display device, this display substrate includes: a display backplane and an encapsulation layer; the display back plate comprises a plurality of luminous sub-pixels arranged in an array; the packaging layer is positioned on one side of the display back plate; aiming at a second display area at the periphery of the first display area, one side of the packaging layer, which deviates from the display back plate, is provided with a plurality of first concave structures, at least part of the first concave structures are positioned in an effective display area of the luminous sub-pixels, so that at least part of light rays emitted by the luminous sub-pixels and larger than a first critical angle are not totally reflected at the interface of the first concave structures, at least part of light rays emitted by the luminous sub-pixels and larger than the first critical angle are directly emitted at the interface of the first concave structures, the light-emitting brightness of the corresponding luminous sub-pixels is improved, the problem of large visual angle color deviation of the luminous sub-pixels in the second display area is improved, and the display effect of the whole display substrate is improved.

Description

Display substrate and display device

Technical Field

The application relates to the technical field of display, in particular to a display substrate and a display device.

Background

The Organic Light Emitting Diode (OLED) display panel belongs to autonomous light emitting, has the advantages of low driving voltage, high light emitting efficiency, short response time, high definition and contrast, nearly 180-degree visual angle, wide use temperature range and the like, and can realize flexible display and large-area full-color display. The active matrix organic electroluminescent diode (AM-OLED) is a new generation of novel display technology and has a huge application prospect.

The AMOLED display panel comprises array sub-pixels formed by three primary colors RGB, and different chromaticities are displayed by controlling the light emitting brightness of the RGB sub-pixels. However, when the viewing angle is changed, the luminance degradation of the RGB sub-pixels is not uniform, and color shift is easily caused.

SUMMERY OF THE UTILITY MODEL

The application provides a display substrate and a display device aiming at the defects of the existing mode so as to solve the problem that the existing display substrate has large visual angle color cast.

In a first aspect, an embodiment of the present application provides a display substrate, including a first display area and a second display area located at a periphery of the first display area, the display substrate including: a display backplane and an encapsulation layer; the display back plate comprises a plurality of luminous sub-pixels arranged in an array; the packaging layer is positioned on one side of the display back plate; for the second display area, the packaging layer comprises a plurality of first concave structures, and orthographic projections of the first concave structures on the display back plate and orthographic projections of the effective display areas of the luminous sub-pixels on the display back plate are at least partially overlapped, so that at least part of light rays emitted by the luminous sub-pixels and larger than a first critical angle are not subjected to total reflection at interfaces of the first concave structures.

Optionally, the plurality of light-emitting sub-pixels comprise three different light-emitting materials, and the light-emitting sub-pixels of the three different light-emitting materials are respectively a first sub-pixel, a second sub-pixel and a third sub-pixel; for the second display area, the encapsulation layer corresponding to at least one of the first sub-pixel, the second sub-pixel or the third sub-pixel comprises the first concave structure.

Optionally, the encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked on one side of the display backplane; the first concave structure is formed by the fact that one side, away from the display back plate, of the second inorganic packaging layer is concave towards one side, close to the display back plate.

Optionally, the display substrate further comprises: a touch layer; the touch layer is positioned on one side, away from the display back plate, of the second inorganic packaging layer, and the refractive index of the touch layer is larger than that of the second inorganic packaging layer; aiming at the second display area, a plurality of second concave structures are arranged on one side, away from the packaging layer, of the touch layer; the orthographic projection of the second concave structure on the display back plate is at least partially overlapped with the orthographic projection of the effective display area of the luminous sub-pixel on the display back plate, so that at least part of light rays emitted by the packaging layer and larger than a second critical angle do not generate total reflection on an interface of the second concave structure.

Optionally, the second display area includes a first bending area and a second bending area, the first bending area and the second bending area are respectively located at two sides of the first display area, and the first bending structure and the second bending structure are symmetrical with respect to the first display area.

Optionally, the light emitting sub-pixel comprises an electroluminescent structure; the orthographic projection of the first concave structure on the display back plate is positioned on one side, close to the first display area, of the electroluminescent structure; the orthographic projection of the second concave structure on the display back plate is positioned on one side, close to the first display area, of the electroluminescent structure.

Optionally, for the same light-emitting sub-pixel, an orthographic projection of the second concave structure on the display back plate is close to the first display area relative to an orthographic projection of the first concave structure on the display back plate.

Optionally, the display substrate further comprises: an organic insulating layer; the organic insulating layer is positioned on one side, away from the packaging layer, of the touch layer, and covers the second concave structure of the touch layer; the refractive index of the organic insulating layer is smaller than that of the touch layer.

Optionally, the first recessed structure includes at least one first interface, an orthographic projection of the first interface on the display backplane and an orthographic projection of the effective display area of the light-emitting sub-pixel on the display backplane are at least partially overlapped, and an included angle between the first interface and the display backplane forms a first preset angle;

and/or the first interface is one of a plane, a concave surface or a convex surface;

and/or the first preset angle is 5-45 degrees.

Optionally, the second recessed structure includes at least one second sub-interface, an orthographic projection of the second sub-interface on the display backplane and an orthographic projection of the effective display area of the light-emitting sub-pixel on the display backplane are at least partially overlapped, and an included angle between the second sub-interface and the display backplane forms a second preset angle;

and/or the second interface is one of a plane, a concave surface or a convex surface;

and/or the second preset angle is 5-45 degrees.

Optionally, the touch layer includes: the first inorganic touch layer and the second inorganic touch layer are arranged in a stacked mode, and the second concave structure is arranged on the second inorganic touch layer; the first inorganic touch layer covers the second inorganic packaging layer, and the organic insulating layer covers the second inorganic touch layer.

Optionally, the touch layer further includes: a first touch electrode and a second touch electrode; the first touch electrode and the second touch electrode are positioned on one side, away from the display back plate, of the second inorganic touch layer, and the organic insulating layer covers the first touch electrode and the second touch electrode.

Optionally, the bending angle of the first bending area or the second bending area is 45-90 degrees; the size of the orthographic projection of the first bending area or the second bending area on the plane of the first display area along the direction vertical to the symmetrical center plane of the first bending area and the second bending area is 0.01 cm-1.5 cm.

In a second aspect, embodiments of the present application further provide a display device, including the display substrate according to the first aspect of the present application.

The beneficial technical effects brought by the technical scheme provided by the embodiment of the application at least comprise:

the display substrate provided by the embodiment of the application, the packaging layer through the second display area at the periphery of the first display area is provided with the plurality of first recessed structures, at least part of the first recessed structures are located in the effective display area of the luminous sub-pixels, and the first recessed structures destroy the original partial total reflection interfaces of the packaging layer and other film layers, so that at least part of light rays which are emitted by the luminous sub-pixels and are greater than a first critical angle are directly emitted out at the interfaces of the first recessed structures, the light-emitting brightness of the corresponding luminous sub-pixels is improved, the problem of large visual angle color cast of the luminous sub-pixels in the second display area is improved, and the display effect of the whole display substrate is improved.

Additional aspects and advantages of the present 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 present 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 of which:

fig. 1 is a schematic overall structure diagram of a display substrate according to an embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional view of a display substrate according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a light-emitting sub-pixel on the left side of a second display area of a display substrate and a first recess structure according to an embodiment of the present disclosure;

FIG. 4 is a schematic cross-sectional view taken along A-A of FIG. 3 according to an embodiment of the present application;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 3 according to an embodiment of the present application;

fig. 6 is a schematic diagram of a right-side light-emitting sub-pixel and a first recess structure of a second display region of a display substrate according to an embodiment of the present disclosure;

FIG. 7 is a schematic cross-sectional view taken along line C-C of FIG. 6 according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a left light-emitting sub-pixel and a first and a second recessed structures of a second display area of a display substrate according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a light-emitting sub-pixel on the right side of a second display area of another display substrate and a first recessed structure and a second recessed structure according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram illustrating a first recess structure of a display substrate according to an embodiment of the present disclosure;

fig. 11 is another schematic structural diagram of a first recess structure of a display substrate according to an embodiment of the disclosure.

Wherein:

100-a first display area;

200-a second display area; 210-a first bending zone; 220-a second bending zone;

300-a display backplane; 310-a base layer; 320-a switching device layer; 330-a light emitting device layer;

400-an encapsulation layer; 400 a-a first recess structure; 400 b-first interface; 410-a first inorganic encapsulation layer; 420-organic encapsulation layer; 430-a second inorganic encapsulation layer;

500-a touch layer; 500 a-a second recessed feature; 500 b-a second interface; 510-a first inorganic touch layer; 520-a second inorganic touch layer; 530-a first touch electrode; 540-a second touch electrode;

600-organic insulating layer.

Detailed Description

Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

It will be understood by those within the art that, unless otherwise defined, 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. 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 the context clearly indicates otherwise. 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. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

The inventors have found that in a top-emitting device, due to the influence of the microcavity effect, the luminance of light-emitting sub-pixels of different light-emitting materials is not uniformly attenuated when the viewing angle is changed, thereby causing a problem of color shift. When the white picture of the display panel is viewed frontally, the bending area at the edge of the display panel displays color cast in different degrees due to a large viewing angle (generally greater than 45 degrees), thereby affecting the display effect.

The embodiment of the application provides a display substrate and a display device, aiming at solving the defects in the prior art.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.

As shown in fig. 1, an embodiment of the present application provides a display substrate, which includes a first display area 100 and a second display area 200, where the first display area 100 is a main display area of the display substrate, and the second display area 200 can be regarded as a display area around the main display area (the second display area 200 illustrated in fig. 1 is located on two sides of the first display area 100).

Referring to fig. 3 to 7, the display substrate of the present embodiment includes: the display back panel 300 and the packaging layer 400, wherein the display back panel 300 comprises a plurality of light-emitting sub-pixels arranged in an array; the packaging layer 400 is located at one side of the display backplane 300, and plays a role in packaging and protecting the film layer structure of the display backplane 300.

Alternatively, with continued reference to fig. 3-7, the backplate 300 is shown to generally include a base layer 310, a switching device layer 320 on the base layer 310, and a light emitting device layer 330 on the switching device layer 320. The light emitting device layer 330 includes an anode layer, an electroluminescent layer, and a cathode layer.

For the second display area 200, as shown in fig. 3 to 7, the package layer 400 includes a plurality of first recess structures 400a, and the first recess structures 400a may be arranged at specific positions according to actual film materials according to specific structures inside the package layer 400.

Further, the orthographic projection of the first concave structure 400a on the display back plate 300 is at least partially overlapped with the orthographic projection of the effective display area of the light-emitting sub-pixel on the display back plate 300, so that at least part of light rays emitted by the light-emitting sub-pixel and larger than the first critical angle are not totally reflected at the interface of the first concave structure 400a, and thus at least part of light rays which are totally reflected at the interface of the packaging layer 400 originally can be directly emitted from the interface of the first concave structure 400a, and the light-emitting brightness of the corresponding light-emitting sub-pixel is improved. It can be understood that the specific structure and angle of the first recess structure 400a are different, and the effect of not totally reflecting the light emitted from the light emitting sub-pixel at the angle greater than the first critical angle is also different.

The effective display region of the light-emitting sub-pixel refers to an actual display region corresponding to the light-emitting sub-pixel, that is, an opening region of a pixel defining layer (schematically shown as PDL in fig. 4) of the light-emitting sub-pixel, and since the opening of the PDL has an inverted trapezoidal shape, the opening region refers to an opening at the upper end of the pixel defining layer. The opening at the upper end of the pixel definition layer refers to a side of the opening away from the display back plate 300.

Optionally, the orthographic projection of the first concave structure 400a on the display back plate 300 is entirely located in the area where the orthographic projection of the effective display area of the light-emitting sub-pixel on the display back plate 300 is located.

In addition, as can be seen from the relationship between the critical angle of total reflection and the refractive index, the first critical angle is determined by the refractive indexes of the film layers on both sides of the interface of the first concave structure 400a, and specifically, as shown in fig. 4, the refractive index of the film layer on the side of the interface of the first concave structure 400a close to the display back plate 300 is greater than the refractive index of the film layer on the side of the interface of the first concave structure 400a far from the display back plate 300.

Optionally, the first recess structures 400a corresponding to the same light-emitting sub-pixel may be arranged in a linear arrangement or an array arrangement. Illustratively, the first recess structures 400a in fig. 3 and 6 are arranged in a linear arrangement.

In the display substrate provided in this embodiment, the plurality of first recessed structures 400a are disposed on the encapsulation layer 400 of the second display area 200 around the first display area 100, and at least a portion of the first recessed structures 400a is located in the effective display area of the light-emitting sub-pixel, and the first recessed structures 400a destroy the original partially total reflection interfaces of the encapsulation layer 400 and other film layers, so that at least a portion of light emitted by the light-emitting sub-pixel and having an angle greater than a first critical angle is directly emitted at the interfaces of the first recessed structures 400a, thereby improving the luminance of the corresponding light-emitting sub-pixel, improving the problem of large viewing angle color cast of the light-emitting sub-pixel of the second display area 200, and improving the display effect of the entire display substrate.

In some specific embodiments, as shown in fig. 3 and 6, the plurality of light emitting sub-pixels include three different light emitting materials, and the light emitting sub-pixels of the three different light emitting materials are a first sub-pixel (R sub-pixel), a second sub-pixel (G sub-pixel), and a third sub-pixel (B sub-pixel), respectively. For the second display area 200, the encapsulation layer 400 corresponding to at least one of the first sub-pixel, the second sub-pixel, or the third sub-pixel includes the first concave structure 400a, that is, in this embodiment, the arrangement condition of the first concave structure 400a needs to be specifically determined according to the brightness attenuation degree of the first sub-pixel, the second sub-pixel, and the third sub-pixel in the second display area 200 along with the change of the viewing angle.

Alternatively, if the degree of luminance attenuation of the third sub-pixel in the second display area 200 with the change of the viewing angle is large, and the degree of luminance attenuation of the first sub-pixel and the second sub-pixel in the second display area 200 with the change of the viewing angle is small, for the second display area 200, the first concave structure 400a may be disposed only on the encapsulation layer 400 corresponding to the first sub-pixel, so as to increase the luminance of the third sub-pixel, so as to compensate for the luminance difference with the second sub-pixel and the first sub-pixel.

Optionally, continuing with fig. 3 and 6. In some display substrate designs, the luminance of the R and G sub-pixels varies slowly with viewing angle (L-decay), while the L-decay of the B sub-pixel is faster, resulting in a reduced proportion of the Blue component in white balance at large viewing angles, resulting in a yellow-out at large viewing angles. Therefore, the encapsulation layer 400 of the Red sub-pixel and the Green sub-pixel in the second display area 200 is not provided with the concave structure, the brightness of the encapsulation layer is consistent with that of the first display area 100 along with the change of the viewing angle, the encapsulation layer 400 corresponding to the B sub-pixel is provided with the first concave structure 400a, the brightness of the B sub-pixel is slower than that of the first display area 100 along with the decay rate of the viewing angle at the moment, when the first display area 100 is viewed in front, the second display area 200 is observed at a large viewing angle, the brightness decay of the B sub-pixel of the second display area 200 caused by the increase of the viewing angle can be compensated at a high brightness under the large viewing angle, and the high-quality white light can be just synthesized with the brightness of the R sub-pixel and the G sub-pixel, so that the bad phenomenon that the second display area 200 under the large viewing angle emits yellow when the first display area 100 is viewed in front is avoided.

Alternatively, if the luminance attenuation degree of the first sub-pixel and the second sub-pixel in the second display area 200 along with the change of the viewing angle is larger, and only the luminance attenuation degree of the third sub-pixel in the second display area 200 along with the change of the viewing angle is smaller, the first concave structure 400a may be simultaneously included in the encapsulation layer 400 corresponding to the first sub-pixel and the second sub-pixel with respect to the second display area 200.

It should be noted that, due to different light emitting device designs, the variation trend of the luminance attenuation degree of different light emitting sub-pixels with the change of the viewing angle is not fixed. In addition, the corresponding first concave structure 400a can be arranged in a structure and quantity differentiated mode according to different attenuation degrees of the luminous sub-pixels of different luminous materials along with brightness, and the phenomenon of color cast of the second area under a large visual angle is guaranteed.

It is understood that the encapsulation layer in the embodiment of the present application includes an inorganic encapsulation layer and an organic encapsulation layer which are stacked, and generally, in terms of material selection, the refractive index of the inorganic encapsulation layer is greater than the refractive index of the organic encapsulation layer, so that the embodiment of the present application performs the arrangement of the recessed structure on the inorganic encapsulation layer included in the encapsulation layer, that is, the first recessed structure 400a is disposed at an interface of the inorganic encapsulation layer facing away from the display backplane.

In some specific embodiments, as shown in fig. 8 and 9, the encapsulation layer 400 includes a first inorganic encapsulation layer 410, an organic encapsulation layer 420, and a second inorganic encapsulation layer 430 stacked and disposed on one side of the display backplane 300. The first concave structure 400a is formed by recessing a side of the second inorganic encapsulation layer 430 away from the display backplane 300 to a side close to the display backplane 300.

Specifically, the refractive index of the second inorganic encapsulation layer 430 is greater than the refractive index of other film layers adjacent to the second inorganic encapsulation layer and facing away from the display backplane 300, so that at least a portion of the light rays greater than the first critical angle are emitted directly without total reflection at the interface of the first concave structure 400 a.

In some embodiments, with continued reference to fig. 8 and 9, the display substrate provided in the embodiments of the present application further includes a touch layer 500 in addition to the display backplane 300 and the encapsulation layer 400, and the touch layer 500 in the embodiments is embedded in the display substrate.

Specifically, the touch layer 500 is located on a side of the second inorganic encapsulation layer 430 facing away from the display backplane 300, the refractive index of the touch layer 500 is greater than the refractive index of the second inorganic encapsulation layer 430, and since the first concave structure 400a is disposed at an interface between the second inorganic layer and the touch layer 500, at least a part of light emitted from the second inorganic layer at an angle greater than the first critical angle can be directly incident on the touch layer 500.

Optionally, the refractive index of the touch layer 500 is generally 1.3-2.0, and the refractive index of the second inorganic encapsulation layer 430 is generally 1.5-2.0.

Further, for the second display area 200, a plurality of second concave structures 500a are disposed on a side of the touch layer 500 away from the package layer 400, and an orthographic projection of the second concave structures 500a on the display backplane 300 and an orthographic projection of the effective display area of the luminescent sub-pixel on the display backplane 300 are at least partially overlapped, so that at least a part of the light emitted by the package layer 400 and greater than the second critical angle is not totally reflected at an interface of the second concave structures 500a, and thus at least a part of the light originally totally reflected at the interface of the touch layer 500 is directly emitted from the interface of the second concave structures 500a, thereby further improving the luminance of the corresponding luminescent sub-pixel. It can be understood that the specific structure and angle of the second recess structure 500a are different, and the effect of not totally reflecting the light emitted from the encapsulation layer 400 and greater than the second critical angle is also different.

It should be noted that, according to the relationship between the critical angle of total reflection and the refractive index, the second critical angle is determined by the refractive index of the touch layer 500 and the refractive index of other film layers above the touch layer 500, and the refractive index of the touch layer 500 is greater than the refractive index of other film layers (e.g., the organic insulating layer 600) on the side of the touch layer 500 away from the display backplane 300.

Optionally, the plurality of second recess structures 500a corresponding to the same light emitting sub-pixel may be arranged in a linear arrangement or an array arrangement.

Optionally, the number of the second recessed structures 500a corresponds to that of the first recessed structures 400a, and the shape and structure of the second recessed structures 500a are the same as that of the first recessed structures 400 a.

In the display substrate provided in this embodiment, the plurality of second concave structures 500a are disposed on a side of the touch layer 500 of the second display area 200 at the periphery of the first display area 100, which is away from the display backplane 300, because at least a portion of the second concave structures 500a is located in the effective display area of the luminescent sub-pixels, because the second concave structures 500a destroy the original partially total-reflection interfaces of the touch layer 500 and other film layers, at least a portion of the light emitted from the encapsulation layer 400 at a angle greater than the second critical angle is directly emitted at the interfaces of the second concave structures 500a, and through the cooperation between the second concave structures 500a located in the touch layer 500 and the first concave structures 400a located in the encapsulation layer 400, the total-reflection light in the display substrate is further reduced, and the luminance of the corresponding luminescent sub-pixels is further improved, so that the problem of the luminescent sub-pixels in the second display area 200 that have a large viewing angle color shift is improved, the display effect of the whole display substrate is improved.

In some specific embodiments, as shown in fig. 1 and fig. 2, the display substrate provided in this embodiment may be regarded as a curved display screen.

Specifically, the second display area 200 includes a first bending area 210 and a second bending area 220, the first bending area 210 and the second bending area 220 are respectively located at two sides of the first display area 100, and the first bending area 210 and the second bending area 220 are symmetrically arranged with respect to the first display area 100, so that the display effects of the first bending area 210 and the second bending area 220 are as close as possible, and color deviations between the bending areas at two sides of the first display area 100 are avoided.

Illustratively, the first bending region 210 illustrated in fig. 1 and 2 is located at the left side of the first display region 100, and the second bending region 220 illustrated in fig. 1 and 2 is located at the right side of the second display region 200.

In some embodiments, with continued reference to fig. 8 and 9, the light-emitting sub-pixel of the present embodiment includes an electroluminescent structure (illustrated as EL), where EL is the core light-emitting device of the light-emitting sub-pixel and is excited to emit light under the electric field of the cathode layer and the anode layer.

Optionally, for the first bending region 210 or the second bending region 220, the orthographic projection of the first concave structure 400a on the display back plate 300 is located on one side of the electroluminescent structure close to the first display region 100, so that the observation brightness of the light-emitting sub-pixels located in the first bending region 210 or the second bending region 220 at a large viewing angle when the first display region 100 is observed at the front can be improved, and the color cast problem of the first bending region 210 or the second bending region 220 at the large viewing angle can be avoided.

Optionally, for the first bending region 210 or the second bending region 220, the orthographic projection of the second concave structure 500a on the display back plate 300 is located on one side of the electroluminescent structure close to the first display region 100, so that the observation brightness of the light-emitting sub-pixels located in the first bending region 210 or the second bending region 220 at a large viewing angle when the first display region 100 is observed at the front can be improved, and the color cast problem of the first bending region 210 or the second bending region 220 at the large viewing angle can be avoided.

Optionally, as shown in fig. 1, fig. 8 and fig. 9, for the light-emitting sub-pixel of which the luminance decays fastest with the change of the viewing angle of the first bending region 210 or the second bending region 220, the orthographic projection of the second concave structure 500a on the display back plate 300 is closer to the first display region 100 than the orthographic projection of the first concave structure 400a on the display back plate 300, so that a part of the light ray with a larger exit angle in the effective display region can be directly emitted through the first concave structure 400a and/or the second concave structure 500a as much as possible.

In some embodiments, as shown in fig. 8 and 9, the display substrate in this embodiment further includes an organic insulating layer 600 in addition to the display back plate 300, the encapsulation layer 400 and the touch layer 500, and the organic insulating layer 600 may protect the metal electrode of the touch layer 500.

Specifically, the organic insulating layer 600 is located on a side of the touch layer 500 away from the encapsulation layer 400, and the organic insulating layer 600 covers the touch layer 500 and the second recess structure 500a located on the touch layer 500; the refractive index of the organic insulation layer 600 is smaller than the refractive index of the touch layer 500, and the second concave structure 500a is disposed at the interface between the touch layer 500 and the organic insulation layer 600, so that at least a part of light emitted from the touch layer 500 at an angle larger than the second critical angle can be directly emitted into the organic insulation layer 600 and finally emitted into human eyes.

Optionally, the organic insulating layer 600 is made of a polymer or a small molecule material such as polyimide, acrylic glue, etc., and the refractive index is generally 1.3 to 1.6.

In a specific embodiment, as shown in fig. 4, 5 and 7, the first recess structure 400a includes at least one first partition 400b, an effective display area where an orthographic projection of the first partition 400b on the display backplane 300 and an orthographic projection of the light emitting sub-pixel on the display substrate 300 at least partially overlap, and an included angle between the first partition 400b and the display backplane 300 is a first predetermined angle.

Alternatively, the first recess structure 400a may be regarded as a structure obtained by recessing any one of the inorganic layers in the encapsulation layer 400 toward the side close to the display backplane 300, and thus the specific structure of the first recess structure 400a may include many forms. In this embodiment, an inorganic encapsulation layer farthest from the display backplane 300 is taken as an example for description, for example: a trough-like structure similar to the open area of the pixel definition layer in the light emitting device layer 330 (as shown in fig. 10), or a bowl-like hemispherical structure (as shown in fig. 11).

Further, the corresponding first dividing surface 400b may have various shapes and structures according to the specific structure of the first recessed structure 400a, that is, the first dividing surface 400b may be one of a plane, a concave surface (recessed towards the side of the display backplate 300) or a convex surface (raised towards the side away from the display backplate 300).

Optionally, for the case that the first separating surface 400b is a plane, an included angle (i.e., a first preset angle) between the first separating surface 400b and the plane where the display back plate 300 is located is between 5 degrees and 45 degrees, including 5 degrees and 45 degrees at an end point, such an angle setting manner may reduce the total reflection light of the first separating surface 400b as much as possible.

It is understood that, in the case that at least a portion of the first interface 400b is located in the effective display area of the light emitting sub-pixel, a portion of the first interface 400b is located in the effective display area, and another portion of the first interface 400b is located outside the effective display area, as long as a portion of the structure of the first interface 400b is located in the effective display area.

In one embodiment, as shown in fig. 8 and 9, the second recess structure 500a includes at least one second sub-surface 500b, an orthogonal projection of the second sub-surface 500b on the display substrate 300 at least partially overlaps an orthogonal projection of the effective display area of the sub-pixel on the display substrate 300, and an included angle between the second sub-surface 500b and the display backplane 300 is a second predetermined angle.

Alternatively, the second recessed structure 500a may be regarded as a structure that is recessed from a side of the touch layer 500 away from the display back plate 300 toward a direction close to the display back plate 300, and thus the specific structure of the second recessed structure 500a may include various forms, for example: a groove-shaped structure similar to the pixel defining layer opening region in the light emitting device layer 330 (see the first recess structure 400a in fig. 10), or a bowl-shaped hemispherical structure (see the first recess structure 400a in fig. 11).

Further, according to the specific structure of the second concave structure 500a, the corresponding second dividing surface 500b may have various shapes, i.e. the second dividing surface 500b may be one of a plane, a concave surface (concave toward the side of the display back-plate 300) or a convex surface (convex toward the side away from the display back-plate 300).

Optionally, for the second interface 500b being a plane, an included angle (i.e., a second preset angle) between the second interface 500b and the plane where the display backplane 300 is located is between 5 degrees and 45 degrees, including 5 degrees and 45 degrees, such an angle setting manner may reduce the total reflection light of the second interface 500b as much as possible.

It is understood that, in the case that at least a portion of the second interface 500b is located in the effective display area of the light emitting sub-pixel, a portion of the second interface 500b is located in the effective display area, and another portion is located outside the effective display area, as long as a portion of the structure of the second interface 500b is located in the effective display area.

In some embodiments, with continued reference to fig. 8 and 9, the touch layer 500 includes: the first inorganic touch layer 510 and the second inorganic touch layer 520 are stacked and arranged on the side of the packaging layer 400 facing away from the display backplane 300. The second recess structure 500a is disposed on the second inorganic touch layer 520.

Specifically, the first inorganic touch layer 510 specifically covers the second inorganic encapsulation layer 430, and the organic insulation layer 600 covers the second inorganic touch layer 520 and the second recess structure 500a located on the second inorganic touch layer 520.

Optionally, the first inorganic touch layer 510 and the second inorganic touch layer 520 are made of inorganic materials such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, or zirconium oxide.

Optionally, the material of the first inorganic touch layer 510 is the same as the material of the second inorganic touch layer 520.

In some embodiments, with continued reference to fig. 8 and 9, the touch layer 500 includes a first touch electrode 530 and a second touch electrode 540 in addition to the first inorganic touch layer 510 and the second inorganic touch layer 520, and the first touch electrode 530 and the second touch electrode 540 are used for forming an electric field of the touch layer 500. The first touch electrode 530 and the second touch electrode 540 are located on a side of the second inorganic touch layer 520 away from the display backplane 300, and the organic insulating layer 600 covers the first touch electrode 530 and the second touch electrode 540 while covering the second inorganic touch layer 520.

It should be noted that the first touch electrode 530 and the second touch electrode 540 need to be arranged in a staggered manner with respect to the second recessed structure 500a, and are disposed in the non-display region between the adjacent light-emitting sub-pixels as much as possible, and the first touch electrode 530 and the second touch electrode 540 may both adopt transparent electrodes so as to avoid affecting the light-emitting effect.

Optionally, with reference to fig. 2, in order to ensure the display effect under a large viewing angle, the bending angle of the first bending region 210 relative to the plane of the first display region 100 is 45 degrees to 90 degrees. The size of the orthographic projection of the first bending region 210 on the plane of the first display region 100 along the direction perpendicular to the symmetry center plane of the first bending region 210 and the second bending region 220 is 0.01 cm-1.5 cm.

Optionally, with reference to fig. 2, in order to ensure the display effect under a large viewing angle, the bending angle of the second bending region 220 relative to the plane of the second display region 200 is 45 degrees to 90 degrees. The size of the orthogonal projection of the second bending region 220 on the plane of the first display region 100 along the direction perpendicular to the symmetry center plane of the first bending region 210 and the second bending region 220 is 0.01 cm-1.5 cm.

It should be noted that the symmetry center planes of the first bending region 210 and the second bending region 220 are perpendicular to the portion of the display substrate located in the first display region 100, and bisect the first display region 100 into two equal portions.

Based on the same inventive concept, an embodiment of the present application provides a display device, including: such as the display substrate described above in the embodiments of the present application. The display device comprises intelligent wearable display equipment, a curved-surface screen mobile phone, a curved-surface display or a curved-surface television and other electronic equipment.

The display device provided in this embodiment includes the display substrate in the foregoing embodiment, the display substrate is provided with a plurality of first recessed structures 400a on a side of the encapsulation layer 400 of the second display area 200, which is away from the display backplane 300, around the first display area 100, because at least part of the first recessed structures 400a are located in the effective display area of the light-emitting sub-pixels, and because the first recessed structures 400a destroy the original partial total reflection interfaces of the encapsulation layer 400 and other film layers, at least part of the light emitted by the light-emitting sub-pixels, which is greater than the first critical angle, is directly emitted at the interfaces of the first recessed structures 400a, so that the luminance of the corresponding light-emitting sub-pixels is improved, thereby improving the problem of large viewing angle color cast of the light-emitting sub-pixels of the second display area 200, and improving the display effect of the entire display substrate.

In summary, the embodiments of the present application have at least the following technical effects:

in the display substrate and the display device provided in this embodiment, a plurality of first concave structures are disposed on a side of the encapsulation layer of the second display area around the first display area, which is away from the display backplane, because at least part of the first concave structures are located in the effective display area of the luminescent sub-pixel, because the first concave structures destroy the original partial total reflection interface of the encapsulation layer and other film layers, at least part of light emitted by the luminescent sub-pixel and greater than the first critical angle is directly emitted at the interface of the first concave structures, so that the luminance of the corresponding luminescent sub-pixel is improved, the problem of large viewing angle color cast of the luminescent sub-pixel in the second display area is improved, and the display effect of the whole display substrate is improved.

In the description of the present application, it is to 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 those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.

Claims (13)

1. A display substrate comprising a first display region and a second display region, the display substrate comprising:

the display back panel comprises a plurality of luminous sub-pixels arranged in an array;

the packaging layer is positioned on one side of the display back plate; for the second display area, the packaging layer comprises a plurality of first concave structures, and orthographic projections of the first concave structures on the display back plate and orthographic projections of the effective display areas of the luminous sub-pixels on the display back plate are at least partially overlapped, so that at least part of light rays emitted by the luminous sub-pixels and larger than a first critical angle are not subjected to total reflection at interfaces of the first concave structures.

2. The display substrate according to claim 1, wherein the plurality of light-emitting sub-pixels comprise three different light-emitting materials, and the light-emitting sub-pixels of the three different light-emitting materials are a first sub-pixel, a second sub-pixel and a third sub-pixel, respectively;

for the second display area, the encapsulation layer corresponding to at least one of the first sub-pixel, the second sub-pixel or the third sub-pixel comprises the first concave structure.

3. The display substrate according to claim 1 or 2, wherein the encapsulation layer comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked and disposed on one side of the display backplane; the first concave structure is formed by the fact that one side, away from the display back plate, of the second inorganic packaging layer is concave towards one side, close to the display back plate.

4. The display substrate of claim 3, further comprising: a touch layer; the touch layer is positioned on one side, away from the display back plate, of the second inorganic packaging layer, and the refractive index of the touch layer is larger than that of the second inorganic packaging layer;

aiming at the second display area, a plurality of second concave structures are arranged on one side, away from the packaging layer, of the touch layer;

the orthographic projection of the second concave structure on the display back plate is at least partially overlapped with the orthographic projection of the effective display area of the luminous sub-pixel on the display back plate, so that at least part of light rays emitted by the packaging layer and larger than a second critical angle do not generate total reflection on an interface of the second concave structure.

5. The display substrate according to claim 4, wherein the second display region comprises a first bending region and a second bending region, the first bending region and the second bending region are respectively located at two sides of the first display region, and the first bending structure and the second bending structure are symmetrical with respect to the first display region.

6. The display substrate of claim 5, wherein the light emitting sub-pixel comprises an electroluminescent structure;

the orthographic projection of the first concave structure on the display back plate is positioned on one side, close to the first display area, of the electroluminescent structure;

the orthographic projection of the second concave structure on the display back plate is positioned on one side, close to the first display area, of the electroluminescent structure.

7. The display substrate of claim 6, wherein an orthographic projection of the second recessed structure on the display backplane is adjacent to the first display area relative to an orthographic projection of the first recessed structure on the display backplane for the same light-emitting sub-pixel.

8. The display substrate of claim 5, further comprising: an organic insulating layer; the organic insulating layer is positioned on one side, away from the packaging layer, of the touch layer, and covers the second concave structure;

the refractive index of the organic insulating layer is smaller than that of the touch layer.

9. The display substrate according to claim 1, wherein the first recess structure comprises at least one first interface, an orthographic projection of the first interface on the display back plate at least partially overlaps with an orthographic projection of the effective display area of the light-emitting sub-pixel on the display back plate, and an included angle between the first interface and the display back plate is a first preset angle;

and/or the first preset angle is 5-45 degrees;

and/or the first interface is one of planar, concave, or convex.

10. The display substrate according to claim 5, wherein the second recessed structure comprises at least one second sub-interface, an orthogonal projection of the second sub-interface on the display backplane at least partially overlaps an orthogonal projection of the effective display area of the light-emitting sub-pixel on the display backplane, and an included angle between the second sub-interface and the display backplane is a second preset angle;

and/or the second preset angle is 5-45 degrees;

and/or the second interface is one of planar, concave, or convex.

11. The display substrate of claim 8, wherein the touch layer comprises: the first inorganic touch layer and the second inorganic touch layer are arranged in a stacked mode, and the second concave structure is arranged on the second inorganic touch layer; the first inorganic touch layer covers the second inorganic packaging layer, and the organic insulating layer covers the second inorganic touch layer;

the touch layer further includes: a first touch electrode and a second touch electrode; the first touch electrode and the second touch electrode are positioned on one side, away from the display back plate, of the second inorganic touch layer, and the organic insulating layer covers the first touch electrode and the second touch electrode.

12. The display substrate according to claim 5, wherein a bending angle of a portion of the first bending region or the second bending region is 45 to 90 degrees;

the size of the orthographic projection of the first bending area or the second bending area on the plane of the first display area along the direction vertical to the symmetrical center plane of the first bending area and the second bending area is 0.01 cm-1.5 cm.

13. A display device, comprising: a display substrate according to any one of claims 1 to 12.

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