Display panel and display device

Abstract

The invention provides a display panel and a display device, relates to the technical field of display, and aims to solve the problem of non-uniform display of edge positions due to different solvent evaporation rates of light-emitting materials at all positions of a display panel in the related technology. The display panel is provided with a display area and a non-display area located on the edge of the display area, the display panel comprises a substrate and a pixel definition layer arranged on the substrate, the pixel definition layer comprises a plurality of first openings located in the display area and at least one second opening located in the non-display area, and the first openings are located in the non-display area. Display pixels are arranged in the first openings, virtual pixels are arranged in the second openings, the depth of the second openings is gradually increased from the part close to the display area to the part far away from the display area, and on the basis, the depth of the virtual pixels is gradually increased from the part close to the display area to the part far away from the display area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0002] Organic Light Emitting Diode (OLED) as a self-luminous display technology, because it does not need backlight, has high contrast, wide viewing angle and bright color, and has been widely used in display field, and becomes an important development direction. The manufacturing process of OLED display panel is complex, and the preparation of the light emitting layer is one of the key process steps. The existing OLED manufacturing method usually deposits a coating layer containing light emitting material in the opening area of the pixel defining layer (PDL), and performs drying treatment on it in the subsequent process to remove the solvent component in the coating layer, so as to obtain a uniform and dense light emitting layer structure.

[0003] In the existing drying process, the evaporation of the solvent is usually accelerated in a vacuum environment to improve production efficiency. However, in the actual preparation process, the evaporation rate of the center area of the panel is inconsistent with that of the edge area. The difference in evaporation rate may lead to uneven film thickness distribution of the light emitting layer in different areas, and difference in film forming morphology, thereby showing the phenomenon of uneven brightness or color after the display panel is lighted up. SUMMARY

[0004] The purpose of the present application is to provide a display panel and a display device, which has a simple structure and can further optimize the display effect.

[0005] To achieve the above-mentioned purpose, the technical scheme provided by the present application is as follows: The embodiment of the present application provides a display panel having a display area and a non-display area located at the periphery of the display area, which comprises: a substrate, a pixel defining layer disposed on the substrate, the pixel defining layer comprising a plurality of first openings located in the display area and a plurality of second openings located in the non-display area, The depth of the second opening gradually increases from the part close to the display area to the part away from the display area.

[0006] In the display panel provided by the embodiment of the present application, the second opening extends from one end edge of the non-display area close to the display area to the other end edge of the non-display area away from the display area.

[0007] In the display panel provided by the embodiment of the present application, the width of the second opening is greater than the width of the first opening.

[0008] In the display panel provided by the embodiment of the present application, the bottom of the second opening is a slope or a step.

[0009] In the display panel provided by the embodiment of the present application, the slope has an inclination angle of 11.3-26.5 degrees.

[0010] In the display panel provided by the embodiment of the present application, display pixels are arranged in the first opening, and virtual pixels are arranged in the second opening, the thickness of the virtual pixels close to the display area part is consistent with the thickness of the display pixels, and the thickness of the virtual pixels away from the display area part is 1.2-2 times the thickness of the display pixels.

[0011] In the display panel provided by the embodiment of the present application, a series of dams are arranged in the second opening.

[0012] In the display panel provided by the embodiment of the present application, the surface of the dam is coated with a capillary liquid absorption layer, and the capillary liquid absorption layer covers the top and side of the dam.

[0013] In the display panel provided by the embodiment of the present application, the dams are arranged at equal intervals in the second opening.

[0014] Further, to solve the above problems, the embodiment of the present application further provides a display device comprising any one of the display panels provided by the present application.

[0015] The beneficial effects of the present application are: the display panel provided by the present application adopts an innovative dummy area (dummy area) virtual pixel design to solve the problem of uneven atmosphere caused by edge effect in the edge area. Since the second opening is arranged in the non-display area, and the depth of the second opening gradually increases from the part close to the display area to the part far from the display area, based on this, the virtual pixel in the second opening of the non-display area has a depth gradient structure, which can effectively compensate for the uneven atmosphere phenomenon caused by edge effect in the edge of the pixel in the VCD (vacuum chamber drying) process of OLED material film formation. Through this design, more uniform OLED light emitting film layer material distribution can be formed in the edge area of the pixel array, thereby significantly improving the consistency of the luminous brightness of the edge pixels. Further, the depth gradient structure of the non-display area virtual pixel can optimize the solvent evaporation rate of the edge area, making the film formation process of the edge area more uniform, avoiding the problems of film thickness difference and uneven film formation caused by edge effect. This design not only can effectively improve the mura (display unevenness) phenomenon in the edge area of the printed panel, but also can significantly reduce the adverse display problems such as edge color cast and edge babble (edge grain feeling), thereby improving the uniformity and visual effect of the overall display panel. By introducing this non-display area virtual pixel design, the display defect problem caused by uneven atmosphere in the edge area in the traditional process can be effectively solved, thereby improving the yield and display quality of the panel, and meeting the strict requirements of high-end display products on uniformity and consistency. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0017] Figure 1 It is a top view structural schematic diagram of an embodiment of the display panel of the present application.

[0018] Figure 2 It is Figure 1 It is a sectional view structure along the direction of BB'.

[0019] Figure 3 It is a change curve diagram of VCD atmosphere uniformity at different positions of the display panel.

[0020] Figure 4 It is another structural schematic diagram of the second opening.

[0021] Figure 5 It is a schematic diagram of a display device of the present application. DETAILED DESCRIPTION

[0022] The following description of several embodiments refers to the accompanying drawings, wherein:

[0023] As shown in Figure 1 The display panel provided by the embodiments of the present application has a display area AA and a non-display area NA, and the non-display area NA is arranged on at least one side of the display area AA. For example, the non-display area NA can be arranged on one side or multiple sides of the display area AA. It can be understood that the arrangement mode of the non-display area NA can be adjusted according to actual requirements, for example, the non-display area NA can be configured as a single-side non-display area or a double-side non-display area to meet different display requirements. Such a layout mode not only facilitates implementation, but also provides space for the arrangement of other functional circuits or components, thereby further optimizing the overall design of the display panel.

[0024] Figure 2 As shown in Figure 1The cross-sectional structure along the direction of BB' shows that the display panel 100 includes a substrate 4, a pixel definition layer 5 disposed on the substrate 4, and an edge circuit 3 located at the edge region of the pixel definition layer. The substrate 4 can be an array substrate for carrying various structures and circuits of the display panel 100. The pixel definition layer includes a plurality of first openings 1 located in the display area AA and a plurality of second openings 2 located in the non-display area NA. The display pixels are disposed in the first openings, and the virtual pixels are disposed in the second openings 2. The second openings 2 gradually increase in depth H from the portion close to the display area to the portion away from the display area, in other words, the virtual pixels located in the non-display area gradually increase in depth H from the portion close to the display area to the portion away from the display area. The depth H is the distance from the top of the pixel to the position in contact with the bottom of the opening. It can be understood that, due to the faster solvent evaporation rate of the edge region of the pixel definition layer, the virtual pixels are disposed in the non-display area NA, and the virtual pixels are disposed in the form of gradually increasing in depth H from the portion close to the display area to the portion away from the display area, which can effectively alleviate the problem of too fast solvent evaporation rate of the edge region of the pixel definition layer, and further improve the display effect. The display pixels and the virtual pixels both include light-emitting materials, and the difference is that the display pixels are used for emitting light and realizing the display function of the display panel 100, while the virtual pixels do not emit light and are only used for structure optimization and process assistance.

[0025] In the preparation process of the light-emitting layer of the display panel 100, a solution containing light-emitting materials is first injected into the first openings 1 in the display area AA and the second openings 2 in the non-display area NA, and then the solvent in the solution is evaporated by the VCD process, thereby forming the light-emitting layer. It can be understood that, due to the second openings 2, and the virtual pixels in the second openings 2 do not participate in the display of the display panel 100, the distance between the first openings 1 in the display area AA and the edge of the display panel 100 is increased, which is beneficial to improve the uniformity of the solvent concentration in the VCD atmosphere at the corresponding position of the display area AA, and further ensure the film thickness uniformity of the light-emitting layer in the display area AA, so as to alleviate the problem of display unevenness at the edge position of the display panel.

[0026] In some embodiments of the present application, the bottom of the second opening 2 is designed as an inclined surface or a stepped shape, and the width of the second opening 2 is greater than the width of the first opening 1. Continue to refer to Figure 2For example, the bottom of the second opening 2 can be designed as an inclined surface, which gradually decreases from the portion close to the display area AA to the portion far from the display area AA. Further, the inclination angle 7 of the inclined surface is 11.3-26.5 degrees. Specifically, the depth of the virtual pixel close to the display area AA is consistent with the depth of the display pixel, both being H1, and the depth H2 of the virtual pixel far from the display area AA is 1.2-2 times the depth H1 of the virtual pixel close to the display area AA. It can be understood that, by designing the inclination angle and the height in this way, the difference in the solvent evaporation rate at different positions can be effectively alleviated without wasting materials, thereby further ensuring the uniformity of the film thickness of the light-emitting layer. This structural design not only optimizes the process stability, but also improves the overall display effect and reliability of the display panel.

[0027] The embodiments of the present application test the atmosphere uniformity of different virtual pixel regions, and the results are shown in Figure 3 The first curve S1 represents the VCD atmosphere uniformity curve corresponding to the display panel without virtual pixels in the non-display area NA in the related art, the second curve S2 represents the VCD atmosphere uniformity curve corresponding to the display panel with virtual pixels in the non-display area NA, but the depth of the virtual pixels is the same as that of the display pixels, and the third curve S3 represents the VCD atmosphere uniformity curve corresponding to the display panel 100 with virtual pixels in the non-display area NA, and the depth H of the virtual pixels gradually increases from the portion close to the display area AA to the portion far from the display area AA. Among them, the atmosphere uniformity represents the uniformity of the solvent concentration in the VCD atmosphere. It can be seen from Figure 3 that, by setting the virtual pixels in the non-display area NA and making the depth H of the virtual pixels gradually increase from the portion close to the display area AA to the portion far from the display area AA, the VCD atmosphere uniformity is greatly improved whether in the display area AA or in the non-display area NA. This technical effect shows that the embodiments of the present application can effectively improve the display unevenness phenomenon of the display panel 100 at the edge position, thereby improving the display quality.

[0028] In addition, in other embodiments of the present application, please refer to Figure 4The second opening 2 is provided with a dam 8, which is arranged at equal intervals in the second opening 2. It can be understood that the dam 8 can increase the contact area between the solution in the second opening 2 and the vacuum, thereby improving the volatilization rate of the solvent in the second opening 2. This design can effectively compensate for the problem of reduced solvent concentration in the VCD atmosphere caused by the suction effect due to the proximity of the second opening 2 to the edge of the display panel. That is, by increasing the volatilization rate of the solvent in the second opening 2, the solvent concentration in the VCD atmosphere at the position of the second opening 2 is compensated, thereby facilitating the uniformity of the solvent concentration in the VCD atmosphere at each position of the display panel, and further improving the thickness uniformity of the light-emitting layer in the display area AA, so as to further alleviate the problem of display unevenness at the edge position of the display panel. In addition, the surface of the dam 8 is coated with a capillary liquid absorption layer, which covers the top and side of the dam 8. In this embodiment, the capillary liquid absorption layer can attract the solvent on the side of the dam 8 to the top of the dam 8 through capillary effect, thereby further improving the volatilization rate of the solvent. It can be understood that this design can improve the uniformity of the solvent concentration in the VCD atmosphere at each position in the second opening 2, thereby facilitating the film thickness uniformity of the light-emitting layer in the display area AA, and thus significantly improving the overall display effect of the display panel 100.

[0029] Some other embodiments of the present application also provide a display device 1000, as shown in the drawings. Figure 5 The display device 1000 adopts the display panel 100 described above, and thus inherits the technical effects of the display panel 100, specifically including but not limited to improving the VCD atmosphere uniformity of the display panel 100, improving the thickness uniformity of the light-emitting layer in the display area AA, and thus effectively alleviating the problem of display unevenness at the edge position of the display panel 100. In addition, in some examples, the display device 1000 is also provided with a mounting bracket 200 for fixing the display panel 100, so as to facilitate the use of the display panel 100 by the user. This design not only improves the practicability of the display device 1000, but also ensures the stability of the display panel 100 during use.

[0030] In the foregoing embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0031] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application are described by applying specific examples in this paper, the above embodiment is only used to help understanding the technical scheme of the application and its core idea; the ordinary skilled in the art should understand that: it can still modify the technical scheme recorded by the foregoing each embodiment, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of each embodiment of the application.

Claims

1. A display panel, characterized by, A display panel having a display area and a non-display area located at the periphery of the display area, the display panel comprising: a substrate; a pixel definition layer disposed on the substrate, the pixel definition layer comprising a plurality of first openings located in the display area and a plurality of second openings located in the non-display area; wherein the second openings gradually increase in depth from a portion close to the display area to a portion away from the display area.

2. The display panel of claim 1, wherein, The second openings extend from an edge of the non-display area close to the display area to an edge of the non-display area away from the display area.

3. The display panel of claim 2, wherein, The width of the second openings is greater than the width of the first openings.

4. The display panel of claim 2, wherein, The bottom of the second openings is in the form of a slope or a step.

5. The display panel of claim 4, wherein, The slope has an inclination angle of 11.3-26.5 degrees.

6. The display panel of claim 1, wherein, Display pixels are disposed in the first openings, and virtual pixels are disposed in the second openings, the thickness of the virtual pixels close to the display area is consistent with the thickness of the display pixels, and the thickness of the virtual pixels away from the display area is 1.2-2 times the thickness of the display pixels.

7. The display panel of claim 2, wherein, A series of dams are disposed in the second openings.

8. The display panel of claim 7, wherein, The surface of the dams is coated with a capillary liquid absorption layer, and the capillary liquid absorption layer covers the top and side surfaces of the dams.

9. The display panel of claim 7, wherein, The dams are arranged at equal intervals in the second openings.

10. A display device, characterized by comprising: A display device comprising the display panel of any one of claims 1-9.

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