Display substrate and display device

Abstract

The present application provides a display substrate and a display device, wherein the display substrate comprises: a display backplane and an encapsulation layer; the display backplane comprises a plurality of light-emitting sub-pixels arranged in an array; the encapsulation layer is located on one side of the display backplane; for a second display area surrounding the first display area, a plurality of first recessed structures are provided on a side of the encapsulation layer away from the display backplane, and at least a portion of the first recessed structures are located in an effective display area of ​​the light-emitting sub-pixels, so that at least a portion of the light emitted by the light-emitting sub-pixels with a greater angle than a first critical angle is not totally reflected at the interface of the first recessed structures, so that at least a portion of the light emitted by the light-emitting sub-pixels with a greater angle than the first critical angle is directly emitted at the interface of the first recessed structures, thereby improving the luminous brightness of the corresponding light-emitting sub-pixels, thereby improving the problem of large viewing angle angular deviation of the light-emitting sub-pixels in the second display area, and improving the display effect of the entire display substrate.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular, to a display substrate and a display device. Background Art

[0002] Organic light-emitting diode (OLED) display panels are self-luminous, with advantages such as low driving voltage, high luminous efficiency, short response time, high clarity and contrast, nearly 180° viewing angle, and wide operating temperature range. They can realize flexible display and large-area full-color display. Active matrix organic light-emitting diode (AM-OLED) is a new generation of new display technology with great application prospects.

[0003] AMOLED display panels are composed of three primary colors RGB to form array sub-pixels, and different chromaticities are displayed by controlling the luminous brightness of RGB sub-pixels. However, when the viewing angle changes, the brightness attenuation of RGB sub-pixels is inconsistent, which easily leads to color deviation. Summary of the invention

[0004] In view of the shortcomings of the existing methods, the present application proposes a display substrate and a display device to solve the problem of large viewing angle color deviation of the existing display substrate.

[0005] In the first aspect, an embodiment of the present application provides a display substrate, comprising a first display area and a second display area located around the first display area, the display substrate comprising: a display backplane and an encapsulation layer; the display backplane comprises a plurality of light-emitting sub-pixels arranged in an array; the encapsulation layer is located on one side of the display backplane; for the second display area, the encapsulation layer comprises a plurality of first recessed structures, the orthographic projection of the first recessed structure on the display backplane at least partially overlaps with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane, so that at least part of the light emitted by the light-emitting sub-pixel that is greater than a first critical angle is not totally reflected at the interface of the first recessed structure.

[0006] Optionally, 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 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 includes the first recessed structure.

[0007] 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 recessed structure is formed by the second inorganic encapsulation layer being recessed from a side away from the display backplane toward a side close to the display backplane.

[0008] Optionally, the display substrate also includes: a touch layer; the touch layer is located on the side of the second inorganic packaging layer away from the display backplane, and the refractive index of the touch layer is greater than the refractive index of the second inorganic packaging layer; for the second display area, a plurality of second recessed structures are provided on the side of the touch layer away from the packaging layer; the orthographic projection of the second recessed structure on the display backplane at least partially overlaps with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane, so that at least part of the light emitted through the packaging layer and greater than the second critical angle is not totally reflected at the interface of the second recessed structure.

[0009] 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 on both sides of the first display area, and the first bending structure and the second bending structure are symmetrical about the first display area.

[0010] Optionally, the light-emitting sub-pixel includes an electroluminescent structure; the orthographic projection of the first recessed structure on the display backplane is located on a side of the electroluminescent structure close to the first display area; and the orthographic projection of the second recessed structure on the display backplane is located on a side of the electroluminescent structure close to the first display area.

[0011] Optionally, for the same light-emitting sub-pixel, the orthographic projection of the second recessed structure on the display backplane is closer to the first display area than the orthographic projection of the first recessed structure on the display backplane.

[0012] Optionally, the display substrate further includes: an organic insulating layer; the organic insulating layer is located on a side of the touch layer away from the encapsulation layer, and covers the second recessed structure of the touch layer; and the refractive index of the organic insulating layer is smaller than that of the touch layer.

[0013] Optionally, the first recessed structure includes at least one first interface, an orthographic projection of the first interface on the display backplane at least partially overlaps with an orthographic projection of an effective display area of ​​the light-emitting sub-pixel on the display backplane, and an angle between the first interface and the display backplane is a first preset angle;

[0014] And / or, the first interface is one of a plane, a concave surface or a convex surface;

[0015] And / or, the first preset angle is 5 degrees to 45 degrees.

[0016] Optionally, the second recessed structure includes at least one second interface, the orthographic projection of the second interface on the display backplane at least partially overlaps with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane, and the included angle between the second interface and the display backplane is a second preset angle;

[0017] And / or, the second interface is one of a plane, a concave surface or a convex surface;

[0018] And / or, the second preset angle is 5 degrees to 45 degrees.

[0019] Optionally, the touch layer includes: a first inorganic touch layer and a second inorganic touch layer stacked together, the second recessed structure is arranged in the second inorganic touch layer; the first inorganic touch layer covers the second inorganic encapsulation layer, and the organic insulating layer covers the second inorganic touch layer.

[0020] 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 located on a side of the second inorganic touch layer away from the display backplane, and the organic insulating layer covers the first touch electrode and the second touch electrode.

[0021] Optionally, the bending angle of part of the first bending zone or the second bending zone is 45 degrees to 90 degrees; the dimension of the orthographic projection of the first bending zone or the second bending zone on the plane where the first display area is located along the direction perpendicular to the symmetry center plane of the first bending zone and the second bending zone is 0.01 cm to 1.5 cm.

[0022] In a second aspect, an embodiment of the present application further provides a display device, comprising the display substrate described in the first aspect of the present application.

[0023] The beneficial technical effects brought about by the technical solution provided by the embodiment of the present application include at least:

[0024] The display substrate provided by the embodiment of the present application is provided with a plurality of first recessed structures in the encapsulation layer of the second display area around the first display area. Since at least part of the first recessed structures are located in the effective display area of ​​the light-emitting sub-pixel, and since the first recessed structures destroy the original partial total reflection interface between the encapsulation layer and other film layers, at least part of the light emitted by the light-emitting sub-pixel that is greater than the first critical angle is directly emitted at the interface of the first recessed structure, thereby improving the luminous brightness of the corresponding light-emitting sub-pixel, thereby improving the problem of large viewing angle deviation of the light-emitting sub-pixel in the second display area, and improving the display effect of the entire display substrate.

[0025] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 A schematic diagram of the overall structure of a display substrate provided in an embodiment of the present application;

[0028] Figure 2 A schematic cross-sectional view of a display substrate provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of a light-emitting sub-pixel and a first recessed structure on the left side of a second display area of ​​a display substrate provided in an embodiment of the present application;

[0030] Figure 4 Provided in the embodiments of this application Figure 3 Schematic diagram of the cross section along AA;

[0031] Figure 5 Provided in the embodiments of this application Figure 3 Schematic diagram of the cross section along BB;

[0032] Figure 6 A schematic diagram of a right-side light-emitting sub-pixel and a first recessed structure in a second display area of ​​a display substrate provided in an embodiment of the present application;

[0033] Figure 7 Provided in the embodiments of this application Figure 6 Schematic diagram of the cross section along CC;

[0034] Figure 8 A schematic diagram of a light-emitting sub-pixel and a first recessed structure and a second recessed structure on the left side of a second display area of ​​another display substrate provided in an embodiment of the present application;

[0035] Fig. 9 A schematic diagram of a light-emitting sub-pixel and a first recessed structure and a second recessed structure on the right side of a second display area of ​​another display substrate provided in an embodiment of the present application;

[0036] Fig.10 A schematic structural diagram of a first recessed structure of a display substrate provided in an embodiment of the present application;

[0037] Fig.11 Another structural schematic diagram of a first recessed structure of a display substrate provided in an embodiment of the present application.

[0038] in:

[0039] 100-first display area;

[0040] 200 - second display area; 210 - first bending area; 220 - second bending area;

[0041] 300-display backplane; 310-base layer; 320-switching device layer; 330-light-emitting device layer;

[0042] 400-encapsulation layer; 400a-first recessed structure; 400b-first interface; 410-first inorganic

[0043] Encapsulation layer; 420-organic encapsulation layer; 430-second inorganic encapsulation layer;

[0044] 500 - touch layer; 500a - second recessed structure; 500b - second interface; 510 - first inorganic touch layer; 520 - second inorganic touch layer; 530 - first touch electrode; 540 - second touch electrode;

[0045] 600-Organic insulating layer. DETAILED DESCRIPTION

[0046] The present application is described in detail below, and examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. In addition, if the detailed description of the known technology is unnecessary for the features of the present application shown, it will be omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0047] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0048] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0049] The inventors found that in top-emitting devices, due to the influence of the microcavity effect, when the viewing angle changes, the brightness attenuation of the luminous sub-pixels of different luminescent materials is inconsistent, resulting in the problem of color shift. When looking directly at the white screen of the display panel, the bent area at the edge of the display panel shows different degrees of color shift due to the large viewing angle (generally greater than 45 degrees), thus affecting the display effect.

[0050] The embodiments of the present application provide a display substrate and a display device, aiming to solve the above-mentioned defects of the prior art.

[0051] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0052] like Figure 1 As shown, the embodiment of the present application provides a display substrate, including a first display area 100 and a second display area 200, the first display area 100 is the 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 ( Figure 1 The second display area 200 shown in FIG. 1 is located on both sides of the first display area 100).

[0053] See also Figures 3 to 7 The display substrate in this embodiment includes: a display backplane 300 and an encapsulation layer 400. The display backplane 300 includes a plurality of light-emitting sub-pixels arranged in an array; the encapsulation layer 400 is located on one side of the display backplane 300 and plays a role in encapsulating and protecting the film layer structure of the display backplane 300.

[0054] Optionally, continue to Figures 3 to 7 The display backplane 300 generally includes a base layer 310, a switch device layer 320 located on the base layer 310, and a light emitting device layer 330 located on the switch device layer 320. The light emitting device layer 330 includes an anode layer, an electroluminescent layer, and a cathode layer.

[0055] For the second display area 200, combined with Figures 3 to 7As shown, the encapsulation layer 400 includes a plurality of first recessed structures 400 a . According to the specific structure inside the encapsulation layer 400 , the first recessed structures 400 a can be specifically positioned according to the actual film material.

[0056] Furthermore, the orthographic projection of the first recessed structure 400a on the display backplane 300 overlaps at least partially with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane 300, so that at least part of the light emitted by the light-emitting sub-pixel at a greater angle than the first critical angle does not undergo total reflection at the interface of the first recessed structure 400a, so that at least part of the light that was originally totally reflected at the interface of the encapsulation layer 400 can be directly emitted from the interface of the first recessed structure 400a, thereby improving the luminous brightness of the corresponding light-emitting sub-pixel. It is understandable that the specific structure and angle and other parameters of the first recessed structure 400a are different, and the effect of not totally reflecting the light emitted by the light-emitting sub-pixel at a greater angle than the first critical angle is also different.

[0057] It should be noted that the effective display area of ​​the light-emitting sub-pixel refers to the actual display area corresponding to the light-emitting sub-pixel, that is, the pixel definition layer ( Figure 4 The opening area of ​​the pixel definition layer (PDL) is shown in the figure. Since the opening of the PDL is in an inverted trapezoidal shape, the opening area here refers to the opening at the upper end of the pixel definition layer. The opening at the upper end of the pixel definition layer refers to the side of the opening away from the display backplane 300.

[0058] Optionally, the orthographic projections of the first recessed structures 400 a on the display backplane 300 are all located within the region where the orthographic projections of the effective display regions of the light-emitting sub-pixels on the display backplane 300 are located.

[0059] In addition, according to the relationship between the total reflection critical angle and the refractive index, the first critical angle is determined by the refractive index of the film layers on both sides of the interface of the first recessed structure 400a. Specifically, Figure 4 As shown, the refractive index of the film layer located at the interface of the first recessed structure 400a close to the display backplane 300 is greater than the refractive index of the film layer located at the interface of the first recessed structure 400a far from the display backplane 300.

[0060] Optionally, the first recessed structures 400a corresponding to the same light-emitting sub-pixel may be arranged in a linear arrangement or an array arrangement. Figure 3 and Figure 6 The first recessed structures 400a are arranged in a linear manner.

[0061] The display substrate provided in the present embodiment is provided with a plurality of first recessed structures 400a in the encapsulation layer 400 of the second display area 200 around the first display area 100. Since at least part of the first recessed structures 400a are located in the effective display area of ​​the light-emitting sub-pixel, and since the first recessed structures 400a destroy the original partial total reflection interface between the encapsulation layer 400 and other film layers, at least part of the light emitted by the light-emitting sub-pixel that is greater than the first critical angle is directly emitted at the interface of the first recessed structures 400a, thereby improving the luminous brightness of the corresponding light-emitting sub-pixel, thereby improving the problem of large viewing angle deviation of the light-emitting sub-pixel in the second display area 200, and improving the display effect of the entire display substrate.

[0062] In some specific embodiments, Figure 3 and Figure 6 As shown, 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 respectively a first sub-pixel (R sub-pixel), a second sub-pixel (G sub-pixel) and a third sub-pixel (B sub-pixel). With respect to 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 a first recessed structure 400a, that is, in this embodiment, the arrangement of the first recessed structure 400a needs to be specifically determined according to the degree of brightness attenuation of the first sub-pixel, the second sub-pixel and the third sub-pixel in the second display area 200 as the viewing angle changes.

[0063] Optionally, if the brightness attenuation of the third sub-pixel in the second display area 200 with changes in viewing angle is greater, and the brightness attenuation of the first sub-pixel and the second sub-pixel in the second display area 200 with changes in viewing angle is less, then for the second display area 200, only the first recessed structure 400a may be arranged in the encapsulation layer 400 corresponding to the first sub-pixel, thereby increasing the luminous brightness of the third sub-pixel to compensate for the brightness difference with the second sub-pixel and the first sub-pixel.

[0064] Optionally, continue to Figure 3 and Figure 6. In the design structure of some display substrates, the brightness of the R sub-pixel and the G sub-pixel changes with the viewing angle (L-decay) more slowly, while the L-decay of the B sub-pixel is faster. At a large viewing angle, the proportion of the Blue component in the white balance is reduced, resulting in a yellowish color at a large viewing angle. Therefore, the encapsulation layer 400 of the Red sub-pixel and the Green sub-pixel located in the second display area 200 is not provided with a recessed structure, and its brightness changes with the viewing angle to be consistent with the first display area 100, while the encapsulation layer 400 corresponding to the B sub-pixel is provided with a first recessed structure 400a. At this time, the brightness of the B sub-pixel decays more slowly with the viewing angle than that of the first display area 100. When the first display area 100 is viewed directly, the second display area 200 is viewed at a large viewing angle. The higher brightness of the B sub-pixel in the second display area 200 at a large viewing angle can compensate for the excessive brightness decay caused by the increase in the viewing angle, and the luminous brightness of the R sub-pixel and the G sub-pixel is just synthesized to produce high-quality white light, thereby avoiding the undesirable phenomenon that the second display area 200 at a large viewing angle turns yellow when the first display area 100 is viewed directly.

[0065] Optionally, if the brightness attenuation degree of the first sub-pixel and the second sub-pixel in the second display area 200 varies with the viewing angle, and only the brightness attenuation degree of the third sub-pixel in the second display area 200 varies with the viewing angle is relatively small, then for the second display area 200, the encapsulation layer 400 corresponding to the first sub-pixel and the second sub-pixel may include a first recessed structure 400a at the same time.

[0066] It should be noted that due to different designs of light-emitting devices, the changing trend of the brightness attenuation degree of different light-emitting sub-pixels with the change of viewing angle is not fixed. In addition, according to the different attenuation degrees of brightness of light-emitting sub-pixels of different light-emitting materials, the corresponding first recessed structures 400a can be differentiated in structure and quantity to ensure that the second area does not have color deviation under a large viewing angle.

[0067] It can be understood that the encapsulation layer in the embodiment of the present application includes an inorganic encapsulation layer and an organic encapsulation layer that are stacked. 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. Therefore, the embodiment of the present application provides a recessed structure for the inorganic encapsulation layer included in the encapsulation layer, that is, a first recessed structure 400a is provided at the interface of the inorganic encapsulation layer away from the display back panel.

[0068] In some specific embodiments, Figure 8 and Fig. 9 As shown, the encapsulation layer 400 includes a first inorganic encapsulation layer 410, an organic encapsulation layer 420 and a second inorganic encapsulation layer 430 stacked on one side of the display backplane 300. The first recessed structure 400a is formed by the second inorganic encapsulation layer 430 being recessed from the side away from the display backplane 300 to the side close to the display backplane 300.

[0069] Specifically, the refractive index of the second inorganic encapsulation layer 430 is greater than that of other film layers adjacent thereto and away from the display backplane 300 , so that at least part of the light with a light angle greater than the first critical angle is directly emitted without being totally reflected at the interface of the first recessed structure 400 a .

[0070] In some embodiments, continue to refer to Figure 8 and Fig. 9 In addition to the display backplane 300 and the encapsulation layer 400, the display substrate provided in the embodiment of the present application also includes a touch layer 500. The touch layer 500 in this embodiment is built into the display substrate.

[0071] Specifically, the touch layer 500 is located on the side of the second inorganic encapsulation layer 430 away from the display back panel 300, and the refractive index of the touch layer 500 is greater than the refractive index of the second inorganic encapsulation layer 430. Since a first recessed structure 400a is provided at the interface between the second inorganic layer and the touch layer 500, at least part of the light emitted from the second inorganic layer at an angle greater than the first critical angle can directly enter the touch layer 500.

[0072] 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.

[0073] Further, for the second display area 200, a plurality of second recessed structures 500a are provided on the side of the touch layer 500 away from the encapsulation layer 400, and the orthographic projection of the second recessed structure 500a on the display backplane 300 overlaps at least partially with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane 300, so that at least part of the light emitted through the encapsulation layer 400 and greater than the second critical angle does not undergo total reflection at the interface of the second recessed structure 500a, so that at least part of the light that was originally totally reflected at the interface of the touch layer 500 can be directly emitted from the interface of the second recessed structure 500a, thereby further improving the luminous brightness of the corresponding light-emitting sub-pixel. It can be understood that the specific structure and angle and other parameters of the second recessed structure 500a are different, and the effect of not totally reflecting the light emitted through the encapsulation layer 400 and greater than the second critical angle is also different.

[0074] 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 (for example: organic insulating layer 600) on the side of the touch layer 500 away from the display back panel 300.

[0075] Optionally, a plurality of second recessed structures 500a corresponding to the same light-emitting sub-pixel may be arranged in a linear arrangement or an array arrangement.

[0076] Optionally, the number of the second recessed structures 500 a corresponds to the number of the first recessed structures 400 a , and the second recessed structures 500 a and the first recessed structures 400 a have the same shape and structure.

[0077] The display substrate provided in the present embodiment is provided with a plurality of second recessed structures 500a on the side of the touch layer 500 of the second display area 200 away from the display backplane 300. Since at least part of the second recessed structures 500a is located in the effective display area of ​​the light-emitting sub-pixel and the second recessed structures 500a destroy the original partial total reflection interface between the touch layer 500 and other film layers, at least part of the light emitted from the encapsulation layer 400 with a light angle greater than the second critical angle is directly emitted at the interface of the second recessed structures 500a. The second recessed structures 500a located in the touch layer 500 cooperate with the first recessed structures 400a located in the encapsulation layer 400 to further reduce the total reflection light in the display substrate, thereby improving the light emitting brightness of the corresponding light-emitting sub-pixel, thereby improving the problem of large viewing angle color deviation of the light-emitting sub-pixel in the second display area 200 and improving the display effect of the entire display substrate.

[0078] In some specific embodiments, Figure 1 and Figure 2 As shown, the display substrate provided in this embodiment can be regarded as a curved display screen.

[0079] Specifically, the second display area 200 includes a first bending area 210 and a second bending area 220, which are respectively located on both sides of the first display area 100, and the first bending area 210 and the second bending area 220 are symmetrically arranged about 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, avoiding color deviation between the bending areas on both sides of the first display area 100.

[0080] For example, Figure 1 and Figure 2 The first bending area 210 shown in FIG. 1 is located on the left side of the first display area 100 . Figure 1 and Figure 2 The second bending area 220 shown in FIG. 1 is located on the right side of the second display area 200 .

[0081] In some embodiments, continue to refer to Figure 8 and Fig. 9The light-emitting sub-pixel in this embodiment includes an electroluminescent structure (shown as EL in the figure). The EL is the core light-emitting device of the light-emitting sub-pixel, which is excited to emit light under the action of the electric field of the cathode layer and the anode layer.

[0082] Optionally, for the first bending zone 210 or the second bending zone 220, the orthographic projection of the first recessed structure 400a on the display back panel 300 is located on the side of the electroluminescent structure close to the first display zone 100. This can improve the observation brightness of the luminous sub-pixel located in the first bending zone 210 or the second bending zone 220 at a wide viewing angle when observing the first display zone 100 from the front, which is beneficial to avoiding the color deviation problem of the first bending zone 210 or the second bending zone 220 at a wide viewing angle.

[0083] Optionally, for the first bending zone 210 or the second bending zone 220, the orthographic projection of the second recessed structure 500a on the display back panel 300 is located on the side of the electroluminescent structure close to the first display zone 100. This can improve the observation brightness of the luminous sub-pixel located in the first bending zone 210 or the second bending zone 220 at a wide viewing angle when observing the first display zone 100 from the front, which is beneficial to avoid color deviation problems in the first bending zone 210 or the second bending zone 220 at a wide viewing angle.

[0084] Optionally, combined Figure 1 , Figure 8 and Fig. 9 As shown, for the light-emitting sub-pixel whose brightness decays fastest with viewing angle in the first bending zone 210 or the second bending zone 220, the orthographic projection of the second recessed structure 500a on the display backplane 300 is closer to the first display area 100 than the orthographic projection of the first recessed structure 400a on the display backplane 300, so that a portion of the light with a larger exit angle in the effective display area can be directly emitted through the first recessed structure 400a and / or the second recessed structure 500a as much as possible.

[0085] In some embodiments, Figure 8 and Fig. 9 As shown, the display substrate in this embodiment includes, in addition to the display backplane 300 , the encapsulation layer 400 and the touch layer 500 , an organic insulating layer 600 . The organic insulating layer 600 can protect the metal electrodes of the touch layer 500 .

[0086] Specifically, the organic insulating layer 600 is located on the 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 recessed structure 500a located in the touch layer 500; the refractive index of the organic insulating layer 600 is smaller than the refractive index of the touch layer 500. Since the second recessed structure 500a is provided at the interface between the touch layer 500 and the organic insulating layer 600, at least part of the light emitted from the touch layer 500 at an angle greater than the second critical angle can directly enter the organic insulating layer 600 and finally enter the human eye.

[0087] Optionally, the material of the organic insulating layer 600 is a polymer or small molecule material such as polyimide and acrylic adhesive, and the refractive index is generally 1.3-1.6.

[0088] In a specific embodiment, Figure 4 , Figure 5 and Figure 7 As shown, the first recessed structure 400a includes at least one first interface 400b, an effective display area where the orthographic projection of the first interface 400b on the display backplane 300 at least partially overlaps with the orthographic projection of the light-emitting sub-pixel on the display substrate 300, and the angle between the first interface 400b and the display backplane 300 is a first preset angle.

[0089] Optionally, the first recessed structure 400a can be regarded as a structure obtained by recessing any inorganic layer in the encapsulation layer 400 toward a side close to the display backplane 300, so the specific structure of the first recessed structure 400a can include many forms. In this embodiment, an inorganic encapsulation layer farthest from the display backplane 300 is used as an example for description, for example: a groove-shaped structure similar to the opening area of ​​the pixel definition layer in the light-emitting device layer 330 (such as Fig.10 ), or a hemispherical structure similar to a bowl (such as Fig.11 shown).

[0090] Furthermore, depending on the specific structure of the first recessed structure 400a, the corresponding first interface 400b may also have a variety of shape structures, that is, the first interface 400b may be one of a plane, a concave surface (recessed toward the side of the display back panel 300) or a convex surface (convex toward the side away from the display back panel 300).

[0091] Optionally, when the first interface 400b is a plane, the angle between the first interface 400b and the plane where the display back panel 300 is located (i.e., the first preset angle) is between 5 degrees and 45 degrees, including endpoint values ​​5 degrees and 45 degrees. Such an angle setting method can minimize the total reflection of the first interface 400b.

[0092] It can be understood that at least part of the first interface 400b is located in the effective display area of ​​the light-emitting sub-pixel, which means that part of the first interface 400b is located in the effective display area and the other part is located outside the effective display area. It is sufficient to ensure that part of the structure of the first interface 400b is located in the effective display area.

[0093] In a specific embodiment, as shown in FIG. Figure 8 and Fig. 9 The second recessed structure 500a includes at least one second interface 500b, the orthographic projection of the second interface 500b on the display substrate 300 at least partially overlaps with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display substrate 300, and the angle between the second interface 500b and the display backplane 300 is a second preset angle.

[0094] Optionally, the second recessed structure 500a can be regarded as a structure obtained by recessing the side of the touch layer 500 away from the display back plate 300 toward the display back plate 300, so the specific structure of the second recessed structure 500a can include many forms, for example: a groove-shaped structure similar to the opening area of ​​the pixel definition layer in the light-emitting device layer 330 (see Fig.10 The first concave structure 400a in the embodiment of the present invention may be a hemispherical structure similar to a bowl (see Fig.11 The first recessed structure 400a in FIG.

[0095] Furthermore, depending on the specific structure of the second recessed structure 500a, the corresponding second interface 500b may also have a variety of shape structures, that is, the second interface 500b may be a plane, a concave surface (recessed toward the side of the display back panel 300) or a convex surface (convex toward the side away from the display back panel 300).

[0096] Optionally, if the second interface 500b is a plane, the angle between the second interface 500b and the plane where the display back panel 300 is located (i.e., the second preset angle) is between 5 degrees and 45 degrees, including endpoint values ​​5 degrees and 45 degrees. This angle setting method can minimize the total reflection of the second interface 500b.

[0097] It can be understood that at least part of the second interface 500b is located in the effective display area of ​​the light-emitting sub-pixel, which means that part of the second interface 500b is located in the effective display area and the other part is located outside the effective display area. It is sufficient to ensure that part of the structure of the second interface 500b is located in the effective display area.

[0098] In some specific embodiments, referring to FIGS. 8 and 9 , the touch layer 500 includes: a first inorganic touch layer 510 and a second inorganic touch layer 520 stacked on the side of the encapsulation layer 400 away from the display backplane 300 . The second recessed structure 500 a is disposed in the second inorganic touch layer 520 .

[0099] 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 recessed structure 500 a located in the second inorganic touch layer 520 .

[0100] 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.

[0101] Optionally, the material of the first inorganic touch layer 510 is the same as the material of the second inorganic touch layer 520 .

[0102] In some specific embodiments, see Figure 8 and Fig. 9 In addition to the first inorganic touch layer 510 and the second inorganic touch layer 520, the touch layer 500 also includes a first touch electrode 530 and a second touch electrode 540, which are used to form an electric field of the touch layer 500. The first touch electrode 530 and the second touch electrode 540 are located on the side of the second inorganic touch layer 520 away from the display backplane 300. The organic insulating layer 600 covers the second inorganic touch layer 520 and the first touch electrode 530 and the second touch electrode 540.

[0103] It should be noted that the first touch electrode 530 and the second touch electrode 540 need to be staggered with the second recessed structure 500a, and should be set in the non-display area between adjacent light-emitting sub-pixels as much as possible, and both the first touch electrode 530 and the second touch electrode 540 can adopt transparent electrodes to avoid affecting the light output effect.

[0104] Optionally, continue to Figure 2 In order to ensure the display effect under a wide viewing angle, the bending angle of the first bending area 210 relative to the plane where the first display area 100 is located is 45 degrees to 90 degrees. The dimension of the orthographic projection of the first bending area 210 on the plane where the first display area 100 is located along the direction perpendicular to the symmetric center plane of the first bending area 210 and the second bending area 220 is 0.01 cm to 1.5 cm.

[0105] Optionally, continue to Figure 2In order to ensure the display effect under a wide viewing angle, the bending angle of the second bending area 220 relative to the plane where the second display area 200 is located is 45 degrees to 90 degrees. The dimension of the orthographic projection of the second bending area 220 on the plane where the first display area 100 is located along the direction perpendicular to the symmetric center plane of the first bending area 210 and the second bending area 220 is 0.01 cm to 1.5 cm.

[0106] It should be noted that the symmetric center plane between the first bending area 210 and the second bending area 220 is perpendicular to the portion of the display substrate located in the first display area 100 , and divides the first display area 100 into two equal parts.

[0107] Based on the same inventive concept, the embodiment of the present application provides a display device, including: the display substrate as described above in the embodiment of the present application. The display device includes electronic devices such as smart wearable display devices, curved screen mobile phones, curved displays or curved TVs.

[0108] The display device provided in this embodiment includes the display substrate in the aforementioned embodiment, wherein the display substrate is provided with a plurality of first recessed structures 400a on the side of the encapsulation layer 400 of the second display area 200 away from the display back panel 300 in the periphery of the first display area 100. Since at least part of the first recessed structures 400a are located in the effective display area of ​​the light-emitting sub-pixel, and since the first recessed structures 400a destroy the original partial total reflection interface between the encapsulation layer 400 and other film layers, at least part of the light emitted by the light-emitting sub-pixel that is greater than the first critical angle is directly emitted at the interface of the first recessed structures 400a, thereby improving the luminous brightness of the corresponding light-emitting sub-pixel, thereby improving the problem of large viewing angle color deviation of the light-emitting sub-pixel in the second display area 200, and improving the display effect of the entire display substrate.

[0109] In summary, each embodiment of the present application has at least the following technical effects:

[0110] The display substrate and display device provided in the present embodiment are provided with a plurality of first recessed structures on the side of the packaging layer of the second display area surrounding the first display area away from the display back panel. Since at least part of the first recessed structures are located in the effective display area of ​​the light-emitting sub-pixel, and since the first recessed structures destroy the original partial total reflection interface between the packaging layer and other film layers, at least part of the light emitted by the light-emitting sub-pixel that is greater than the first critical angle is directly emitted at the interface of the first recessed structure, thereby improving the luminous brightness of the corresponding light-emitting sub-pixel, thereby improving the problem of large viewing angle deviation of the light-emitting sub-pixel in the second display area, and improving the display effect of the entire display substrate.

[0111] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0112] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0113] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0114] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0115] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A display substrate, comprising a first display area and a second display area, characterized in that: The display substrate comprises: A display backplane, the display backplane comprising a plurality of light-emitting sub-pixels arranged in an array; An encapsulation layer, the encapsulation layer is located on one side of the display backplane; for the second display area, the encapsulation layer includes a plurality of first recessed structures, the orthographic projection of the first recessed structure on the display backplane at least partially overlaps with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane, so that at least part of the light emitted by the light-emitting sub-pixel that is greater than the first critical angle is not totally reflected at the interface of the first recessed structure, and the refractive index of the film layer on the side of the interface of the first recessed structure close to the display backplane is greater than the refractive index of the film layer on the side of the interface of the first recessed structure away from the display backplane.

2. The display substrate according to claim 1, characterized in that: 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 respectively a first sub-pixel, a second sub-pixel and a third sub-pixel; With respect to 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 includes the first recessed structure.

3. The display substrate according to claim 1 or 2, characterized in that: 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 recessed structure is formed by the second inorganic encapsulation layer being recessed from a side away from the display backplane toward a side close to the display backplane.

4. The display substrate according to claim 3, characterized in that: Also includes: Touch layer; The touch layer is located on a side of the second inorganic encapsulation layer away from the display backplane, and the refractive index of the touch layer is greater than the refractive index of the second inorganic encapsulation layer; With respect to the second display area, a plurality of second recessed structures are provided on a side of the touch layer facing away from the encapsulation layer; The orthographic projection of the second recessed structure on the display backplane at least partially overlaps with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane, so that at least part of the light emitted through the encapsulation layer at a speed greater than the second critical angle is not totally reflected at the interface of the second recessed structure.

5. The display substrate according to claim 4, characterized in that: 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 on two sides of the first display area, and the first bending area structure and the second bending area structure are symmetrical with respect to the first display area.

6. The display substrate according to claim 5, characterized in that: The light-emitting sub-pixel comprises an electroluminescent structure; The orthographic projection of the first concave structure on the display backplane is located on a side of the electroluminescent structure close to the first display area; The orthographic projection of the second recessed structure on the display backplane is located on a side of the electroluminescent structure close to the first display area.

7. The display substrate according to claim 6, characterized in that: For the same light-emitting sub-pixel, the orthographic projection of the second recessed structure on the display backplane is closer to the first display area than the orthographic projection of the first recessed structure on the display backplane.

8. The display substrate according to claim 5, characterized in that: Also includes: Organic insulating layer; The organic insulating layer is located on a side of the touch layer away from the encapsulation layer, and the organic insulating layer covers the second recessed structure; The refractive index of the organic insulating layer is smaller than the refractive index of the touch layer.

9. The display substrate according to claim 1, characterized in that: The first recessed structure comprises at least one first interface, the orthographic projection of the first interface on the display backplane at least partially overlaps with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane, and the angle between the first interface and the display backplane is a first preset angle; And / or, the first preset angle is 5 degrees to 45 degrees; And / or, the first interface is one of a plane, a concave surface or a convex surface.

10. The display substrate according to claim 5, characterized in that: The second recessed structure comprises at least one second interface, the orthographic projection of the second interface on the display backplane at least partially overlaps with the orthographic projection of the effective display area of ​​the light-emitting sub-pixel on the display backplane, and the included angle between the second interface and the display backplane is a second preset angle; And / or, the second preset angle is 5 degrees to 45 degrees; And / or, the second interface is one of a plane, a concave surface or a convex surface.

11. The display substrate according to claim 8, characterized in that: The touch layer comprises: a first inorganic touch layer and a second inorganic touch layer which are stacked, wherein the second recessed structure is arranged on the second inorganic touch layer; the first inorganic touch layer covers the second inorganic encapsulation 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 located on a side of the second inorganic touch layer away from the display backplane, and the organic insulating layer covers the first touch electrode and the second touch electrode.

12. The display substrate according to claim 5, characterized in that: The bending angle of the first bending area or the second bending area is 45 degrees to 90 degrees; The dimension of the orthographic projection of the first bending area or the second bending area on the plane where the first display area is located along a direction perpendicular to the symmetric center plane of the first bending area and the second bending area is 0.01 cm to 1.5 cm.

13. A display device, characterized in that: include: The display substrate according to any one of claims 1 to 12.

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