Display panel, preparation method thereof and display device

Abstract

The invention relates to a display panel, a preparation method thereof and a display device. The display panel comprises a pixel defining layer, wherein a non-pixel area of the pixel defining layer is provided with a plurality of open holes; the reflecting layer is located in the open hole, the thickness of the reflecting layer is smaller than the depth of the open hole, and the reflecting layer is used for reflecting ambient light incident from the display side of the display panel, so that at least part of the ambient light is irradiated in the pixel defining layer and is absorbed by the pixel defining layer; the optical adhesive layer is located on one side of the pixel defining layer, and the light transmittance of the optical adhesive layer is larger than that of the pixel defining layer. The influence of ambient light on the display effect of the display panel can be reduced, the contrast ratio of the display panel is improved, a user can see a displayed picture clearly, and the display effect of the display panel is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] Organic Light Emitting Display (OLED) display panels have the advantages of self-luminescence, high luminous efficiency, low power consumption, fast response, wide viewing angle, high brightness, bright colors, and light weight. They are widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, and have become the mainstream in display devices.

[0003] However, the display effect of current display panels needs to be improved. Summary of the invention

[0004] Based on this, it is necessary to provide a display panel and a manufacturing method thereof, and a display device to improve the display effect of the display panel.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a display panel, comprising: a pixel defining layer, wherein a non-pixel region of the pixel defining layer has a plurality of openings;

[0006] a reflective layer, the reflective layer being located in the opening and having a thickness less than a depth of the opening, the reflective layer being used to reflect ambient light incident from a display side of the display panel, so that at least a portion of the ambient light is irradiated into the pixel defining layer and absorbed by the pixel defining layer;

[0007] An optical adhesive layer is located on one side of the pixel defining layer, and the optical adhesive layer has a light transmittance greater than that of the pixel defining layer.

[0008] In the above-mentioned display panel, ambient light irradiates the display panel from the display side, part of the ambient light is absorbed by the optical adhesive layer, part of the ambient light emitted from the optical adhesive layer directly irradiates the pixel definition layer through the opening and is absorbed by the pixel definition layer, and at the same time, part of the ambient light emitted from the optical adhesive layer irradiates the surface of the reflective layer and is reflected on the surface of the reflective layer, and at least part of the ambient light after reflection irradiates the pixel definition layer and is absorbed by the pixel definition layer. In summary, the setting of the pixel definition layer and the reflective layer reduces the amount of ambient light emitted from the display side, thereby reducing the influence of ambient light on the display effect of the display panel, improving the contrast of the display panel, and improving the display effect of the display panel.

[0009] In one embodiment, the light transmittance of the pixel defining layer is 0%-10%; the light transmittance of the optical adhesive layer is 40%-60%;

[0010] Preferably, the pixel definition layer is black; the optical adhesive layer is black;

[0011] Preferably, the thickness of the optical adhesive layer is 20 μm-200 μm.

[0012] In this way, not only can the contrast of the display panel be further improved, but also excessive power consumption of the display panel can be avoided.

[0013] In one embodiment, the pixel definition layer further has a plurality of pixel definition holes located in the pixel area; and the display panel further comprises:

[0014] A substrate, wherein the pixel defining layer and the optical adhesive layer are stacked on one side of the substrate;

[0015] A plurality of light-emitting devices, wherein the light-emitting devices are located in the pixel definition hole, and the light-emitting devices include an anode layer and a cathode layer that are arranged opposite to each other, and a light-emitting layer located between the anode layer and the cathode layer;

[0016] The cathode layer is located on a side of the light emitting layer away from the anode layer, and the cathode layer extends to cover a surface of a side of the pixel defining layer away from the substrate, and the reflective layer is made of the same material as the cathode layer.

[0017] In this way, the contrast between the pixel area and the non-pixel area of ​​the display panel is improved, and the display effect of the display panel is improved.

[0018] In one embodiment, the ratio of the total area of ​​the orthographic projections of the plurality of reflective layers on the substrate to the area of ​​the non-pixel region is in the range of 0.5-0.7;

[0019] Preferably, along the direction away from the pixel area, the area of ​​the orthographic projection of the opening on the surface of the substrate gradually decreases; and / or, along the direction away from the pixel area, the density of the opening gradually increases.

[0020] In this way, by limiting the ratio of the total area of ​​the orthographic projections of the plurality of reflective layers on the substrate to the area of ​​the non-pixel region, not only the amount of ambient light irradiated on and reflected by the reflective layer is increased, but also the total amount of ambient light that can be absorbed by the pixel defining layer is increased, so that more ambient light can be reflected on the surface of the reflective layer and absorbed by the pixel defining layer, effectively reducing the amount of ambient light emitted from the display side, thereby effectively improving the contrast of the display panel. At the same time, the structural stability of the pixel defining layer is also guaranteed.

[0021] In one embodiment, the opening is a through hole or a blind hole, and the ratio of the thickness of the reflective layer to the depth of the opening is in the range of 0.015 to 0.5;

[0022] Preferably, the thickness of the reflective layer is 0.05µm-0.1µm, and the depth of the opening is 0.5µm-3µm.

[0023] In this way, not only can the amount of ambient light emitted from the display side be effectively reduced, thereby effectively improving the contrast of the display panel, but it is also conducive to making the display panel lighter and thinner.

[0024] In a second aspect, the present disclosure provides a method for preparing a display panel, comprising:

[0025] forming a pixel defining layer, wherein a non-pixel region of the pixel defining layer has a plurality of openings;

[0026] forming a reflective layer in the opening, wherein the thickness of the reflective layer is less than the depth of the opening, and the reflective layer is used to reflect ambient light incident from the display side of the display panel, so that at least part of the ambient light is irradiated into the pixel defining layer and absorbed by the pixel defining layer;

[0027] An optical adhesive layer is formed on one side of the pixel defining layer, and the light transmittance of the optical adhesive layer is greater than the light transmittance of the pixel defining layer.

[0028] The method for preparing the above-mentioned display panel is to form a pixel defining layer with a plurality of openings, and to form a reflective layer in the openings, and to form an optical adhesive layer on one side of the pixel defining layer, so that ambient light irradiates the display panel from the display side, and part of the ambient light is absorbed by the optical adhesive layer, and part of the ambient light emitted from the optical adhesive layer directly irradiates the pixel defining layer through the openings and is absorbed by the pixel defining layer, and at the same time, part of the ambient light emitted from the optical adhesive layer irradiates the surface of the reflective layer, and will be reflected on the surface of the reflective layer, and at least part of the ambient light after reflection irradiates the pixel defining layer and is absorbed by the pixel defining layer. In summary, the arrangement of the pixel defining layer, the reflective layer and the optical adhesive layer reduces the amount of ambient light emitted from the display side, thereby reducing the influence of ambient light on the display effect of the display panel, improving the contrast of the display panel, and improving the display effect of the display panel.

[0029] In one embodiment, the light transmittance of the pixel defining layer is 0%-10%; the light transmittance of the optical adhesive layer is 40%-60%;

[0030] Preferably, the pixel definition layer is black; the optical adhesive layer is black;

[0031] Preferably, the thickness of the optical adhesive layer is 20 μm-200 μm.

[0032] In this way, not only can the contrast of the display panel be further improved, but also excessive power consumption of the display panel can be avoided.

[0033] In one embodiment, the step of forming a pixel defining layer includes:

[0034] Providing a substrate, and forming a pixel definition material layer on one side of the substrate;

[0035] The pixel definition material layer is patterned to remove the pixel definition material in the pixel area to form a plurality of pixel definition holes, and to remove part of the pixel definition material in the non-pixel area to form a plurality of openings, thereby obtaining the pixel definition layer.

[0036] In this way, the contrast between the pixel area and the non-pixel area of ​​the display panel is improved, and the display effect of the display panel is improved.

[0037] In one embodiment, after forming the pixel definition layer and before forming the optical adhesive layer, the method further includes:

[0038] A light-emitting device is formed in the pixel definition hole, the light-emitting device includes an anode layer and a cathode layer that are relatively arranged, and a light-emitting layer located between the anode layer and the cathode layer; the cathode layer is located on a side of the light-emitting layer away from the anode layer, and the cathode layer extends to cover a surface of the pixel definition layer away from the substrate; wherein the step of forming the cathode layer includes: depositing cathode material in the pixel area and the non-pixel area to form the cathode layer and a reflective layer located in the opening.

[0039] In this way, the amount of light emitted by the light emitting device absorbed by the optical adhesive layer is small, which is beneficial to controlling the power consumption of the display panel.

[0040] In a third aspect, the present disclosure provides a display device, comprising the display panel described in the first aspect.

[0041] In the above-mentioned display device, ambient light irradiates the display device from the display side, part of the ambient light is absorbed by the optical adhesive layer, part of the ambient light emitted from the optical adhesive layer directly irradiates the pixel definition layer through the opening and is absorbed by the pixel definition layer, and at the same time, part of the ambient light emitted from the optical adhesive layer irradiates the surface of the reflective layer and is reflected on the surface of the reflective layer, and at least part of the ambient light after reflection irradiates the pixel definition layer and is absorbed by the pixel definition layer. In summary, the arrangement of the pixel definition layer, the reflective layer and the optical adhesive layer reduces the amount of ambient light emitted from the display side, thereby reducing the influence of ambient light on the display effect of the display device, improving the contrast of the display device, and improving the display effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 is a partial longitudinal cross-sectional view of a display panel provided in an embodiment;

[0044] Figure 2 for Figure 1 A top view of the middle pixel definition layer;

[0045] Figure 3 is a longitudinal cross-sectional view of a display panel provided in an embodiment;

[0046] Figure 4 is a process flow chart of a method for preparing a display panel provided in an embodiment;

[0047] Figure 5 is a flowchart of a process for preparing a pixel defining layer provided in an embodiment;

[0048] Figure 6 FIG. 4 is a schematic diagram of the structure of a display device provided in an embodiment.

[0049] Description of reference numerals:

[0050] 1. Pixel definition layer; 11. Opening; 12. Pixel definition hole; 2. Reflective layer; 3. Substrate; 4. Light-emitting device; 41. Anode layer; 42. Hole injection layer; 43. Hole transport layer; 44. Light-emitting layer; 45. Electron transport layer; 46. Electron injection layer; 47. Cathode layer; 8. Light-emitting device layer; 5. Optical adhesive layer; 6. Transparent encapsulation layer; 7. Transparent protective film; 9. Display panel; 10. Display device. DETAILED DESCRIPTION

[0051] In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. Embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0053] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, in this specification, the term "and / or" includes any and all combinations of the relevant listed items.

[0054] In recent years, organic light-emitting diodes (OLED) have attracted widespread attention due to their huge application market in the display field. Compared with other display technologies, OLED display panels have many advantages, such as wide viewing angle, fast response speed, no need for backlighting, and flexible display. The OLED display panel includes a substrate, a light-emitting device and a pixel defining layer located on one side surface of the substrate. The light-emitting device is located in the pixel definition hole of the pixel defining layer, and the direction of the light emitted by the light-emitting device is away from the substrate, that is, the display side of the display panel is located on the side of the light-emitting device away from the substrate. The film layer farthest from the substrate in the light-emitting device is the cathode layer, and the cathode layer also extends to cover the side surface of the pixel defining layer away from the substrate.

[0055] When external ambient light shines on the light-emitting device layer from the display side, it will be reflected on the surface of the cathode layer. The reflected ambient light will be emitted together with the light emitted by the light-emitting device. This results in poor contrast of the OLED display panel when the ambient light is strong, and it is difficult for users to see the displayed image clearly. That is, the ambient light has an adverse effect on the display effect of the display panel.

[0056] First, see Figure 1 , Figure 2 The present disclosure provides a display panel 9, including a pixel defining layer 1, a reflective layer 2 and an optical adhesive layer 5; the pixel defining layer 1 has a pixel area and a non-pixel area, the non-pixel area of ​​the pixel defining layer 1 has a plurality of openings 11, the reflective layer 2 is located in the openings 11, and the thickness of the reflective layer 2 is less than the depth of the openings 11, and the reflective layer 2 is used to reflect ambient light incident from the display side of the display panel 9, so that at least part of the ambient light is irradiated in the pixel defining layer 1 and absorbed by the pixel defining layer 1; the optical adhesive layer 5 is located on one side of the pixel defining layer 1, and the light transmittance of the optical adhesive layer 5 is greater than the light transmittance of the pixel defining layer 1. Figure 2 is a top view of the pixel definition layer 1, Figure 1 for Figure 2 A partial longitudinal cross-sectional view of the display panel 9 corresponding to the position AA′.

[0057] In the above-mentioned display panel 9, ambient light irradiates the display panel 9 from the display side, part of the ambient light is absorbed by the optical adhesive layer 5, part of the ambient light emitted from the optical adhesive layer 5 to the pixel defining layer 1 is directly irradiated to the pixel defining layer 1 through the opening 11 and is absorbed by the pixel defining layer 1, and at the same time, part of the ambient light emitted from the optical adhesive layer 5 to the pixel defining layer 1 is irradiated to the surface of the reflective layer 2, and will be reflected on the surface of the reflective layer 2, and at least part of the ambient light after reflection is irradiated in the pixel defining layer 1 and absorbed by the pixel defining layer 1. The arrangement of the pixel defining layer 1, the reflective layer 2, and the optical adhesive layer 5 reduces the amount of ambient light emitted from the display side, thereby reducing the influence of ambient light on the display effect of the display panel 9, improving the contrast of the display panel 9, and improving the display effect of the display panel 9.

[0058] In one embodiment, the light transmittance of the pixel defining layer 1 is 0%-10%; for example, the light transmittance of the pixel defining layer 1 may be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%;

[0059] The light transmittance of the optical adhesive layer 5 is 40%-60%. For example, the light transmittance of the optical adhesive layer 5 is 40%, 43%, 45%, 48%, 50%, 53%, 55%, 58% or 60%.

[0060] In one embodiment, the pixel definition layer 1 is black; the optical adhesive layer 5 is black.

[0061] In one embodiment, the thickness of the optical adhesive layer 5 is 20 μm-200 μm. For example, the optical adhesive layer 5 can be 20 μm, 40 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm or 200 μm.

[0062] It is understood that the light transmittance of the optical adhesive layer 5 can be adjusted by adjusting the thickness of the optical adhesive layer 5. For optical adhesive materials of the same composition, the greater the thickness of the optical adhesive layer 5, the smaller the light transmittance of the optical adhesive layer 5 and the greater the absorption rate of the optical adhesive layer 5.

[0063] It should be noted that the display panel 9 emits light when displaying a picture, and the light emitted by the display panel 9 is transmitted to the display side through the optical adhesive layer 5, and part of the light emitted by the display panel 9 is absorbed by the optical adhesive layer 5. In this embodiment, by limiting the thickness of the optical adhesive layer 5 to 20μm-200μm and the light transmittance of the optical adhesive layer 5 to 40%-60%, the amount of light emitted by the display panel 9 absorbed by the optical adhesive layer 5 is small, thereby having little effect on the brightness of the display panel 9. Therefore, the driving current of the display panel 9 does not need to be set too large to ensure the brightness of the display panel 9, which is conducive to controlling the power consumption of the display panel 9. In this way, not only can the contrast of the display panel 9 be further improved, but also excessive power consumption of the display panel 9 can be avoided.

[0064] In one embodiment, see Figure 1 , Figure 2 The pixel defining layer 1 also has a plurality of pixel defining holes 12 located in the pixel area; the display panel 9 also includes a substrate 3 and a plurality of light-emitting devices 4; the pixel defining layer 1 and the optical adhesive layer 5 are stacked on one side of the substrate 3, the light-emitting device 4 is located in the pixel defining hole 12, the pixel defining layer 1 and the plurality of light-emitting devices 4 constitute a light-emitting device layer 8, and the light-emitting device layer 8 may also include other functional layers.

[0065] The light emitting device 4 includes an anode layer 41 and a cathode layer 47 which are arranged opposite to each other, the cathode layer 47 is located on the side of the anode layer 41 away from the substrate 3, and the cathode layer 47 also extends to cover the surface of the pixel defining layer 1 on the side away from the substrate 3, and the material of the reflective layer 2 is the same as that of the cathode layer 47. In other embodiments, the material of the reflective layer 2 may be different from that of the cathode layer 47. The thickness of the reflective layer 2 may be the same as or different from that of the cathode layer 47.

[0066] After the ambient light is irradiated to the display side of the display panel 9, it is irradiated to the surface of the reflective layer 2 and the surface of the cathode layer 47; wherein, the ambient light irradiated to the reflective layer 2 is reflected on the surface of the reflective layer 2, and at least part of the ambient light after reflection is irradiated to the pixel definition layer 1 and absorbed by the pixel definition layer 1; the ambient light irradiated to the cathode layer 47 is reflected on the surface of the cathode layer 47 and emitted from the display side. That is, the ambient light irradiated to the non-pixel area can be absorbed by the pixel definition layer 1, reducing the amount of ambient light emitted from the display side of the non-pixel area, improving the contrast between the pixel area and the non-pixel area of ​​the display panel 9, and improving the display effect of the display panel 9.

[0067] In one embodiment, see Figure 1 The light-emitting device 4 further includes an anode layer 41, a hole transport layer 43, a light-emitting layer 44 and an electron transport layer 45 which are sequentially stacked in a direction away from the substrate 3, and a cathode layer 47 is located on a side of the electron transport layer 45 away from the substrate 3.

[0068] Under the action of the driving electric field, holes from the anode layer 41 are injected into the hole transport layer 43 and migrate to the light-emitting layer 44, and electrons from the cathode layer 47 are injected into the electron transport layer 45 and migrate to the light-emitting layer 44. When electrons and holes meet in the light-emitting layer 44, they recombine to emit light. The color of the light is mainly determined by the material of the light-emitting layer 44.

[0069] In some other embodiments, see Figure 1 The light emitting device 4 further includes a hole injection layer 42 located between the anode layer 41 and the hole transport layer 43 and an electron injection layer 46 located between the cathode layer 47 and the electron transport layer 45 , and may also include other functional layers.

[0070] In one embodiment, the ratio of the total area of ​​the orthographic projections of the plurality of reflective layers 2 on the substrate 3 to the area of ​​the non-pixel region is in the range of 0.5-0.7; illustratively, it may be 0.5, 0.55, 0.6, 0.65 or 0.7.

[0071] The ratio of the total area of ​​the orthographic projections of the plurality of reflective layers 2 on the substrate 3 to the area of ​​the non-pixel area affects the amount of ambient light absorbed by the pixel defining layer 1. If the ratio of the total area of ​​the orthographic projections of the reflective layer 2 on the substrate 3 to the area of ​​the non-pixel area is too small, the amount of ambient light irradiated to the reflective layer 2 and reflected by the reflective layer 2 is small, and the amount of ambient light entering the pixel defining layer 1 and absorbed by the pixel defining layer 1 is small, and the amount of ambient light emitted from the display side cannot be effectively reduced, and the contrast of the display panel 9 cannot be effectively improved; if the ratio of the total area of ​​the orthographic projections of the reflective layer 2 on the substrate 3 to the area of ​​the non-pixel area is too large, although the amount of ambient light irradiated to the reflective layer 2 and reflected by the reflective layer 2 is large, the area of ​​the pixel defining layer 1 is relatively small, and the total amount of ambient light that can be absorbed by the pixel defining layer 1 is limited, and the amount of ambient light emitted from the display side cannot be effectively reduced, and the contrast of the display panel 9 cannot be effectively improved, and the structural stability of the pixel defining layer 1 is poor.

[0072] In this embodiment, the ratio of the total area of ​​the orthographic projections of the plurality of reflective layers 2 on the substrate 3 to the area of ​​the non-pixel area is limited to 0.5-0.7. Through reasonable settings, not only the amount of ambient light irradiated to the reflective layer 2 and reflected by the reflective layer 2 is increased, but also the total amount of ambient light absorbed by the pixel defining layer 1 is increased, so that more ambient light can be reflected on the surface of the reflective layer 2 and absorbed by the pixel defining layer 1, effectively reducing the amount of ambient light emitted from the display side, thereby effectively improving the contrast of the display panel 9, and ensuring the structural stability of the pixel defining layer 1.

[0073] In one embodiment, the area of ​​the orthographic projection of the opening 11 on the surface of the substrate 3 gradually decreases in a direction away from the pixel area; and / or the density of the opening 11 gradually increases in a direction away from the pixel area.

[0074] In other embodiments, the area of ​​the orthographic projection of the opening 11 on the surface of the substrate 3 may change according to other rules or even not follow any rules, and the density of the opening 11 may change according to other rules or even not follow any rules.

[0075] In one embodiment, the opening 11 is a through hole or a blind hole; the ratio of the thickness of the reflective layer 2 to the depth of the opening 11 can be in the range of 0.015 to 0.5. For example, the ratio of the thickness of the reflective layer 2 to the depth of the opening 11 can be 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 or 0.5.

[0076] It can be understood that a through hole is a hole that penetrates the pixel defining layer 1 , and the depth of the through hole is equal to the thickness of the pixel defining layer 1 ; a blind hole is a hole that does not penetrate the pixel defining layer 1 , and the depth of the blind hole is less than the thickness of the pixel defining layer 1 .

[0077] It should be noted that the area on the substrate 3 where the light-emitting device 4 is arranged is the pixel area, and the area outside the pixel area and adjacent to the pixel area is the non-pixel area. Specifically in the present disclosure, when the opening 11 is a through hole, the area where the through hole is arranged and the area actually covered by the pixel defining layer is the non-pixel area; when the opening 11 is a blind hole, the area actually covered by the pixel defining layer is the non-pixel area. Figure 1 A partial cross-sectional view of the display panel 9 is shown when the opening 11 is a through hole.

[0078] After being reflected by the reflective layer 2, the ambient light enters the pixel definition layer 1 through the side wall of the opening 11 not covered by the reflective layer 2 and is absorbed by the pixel definition layer 1. The ratio of the thickness of the reflective layer 2 to the depth of the opening 11 is related to the size of the side wall area of ​​the pixel definition layer 1 for absorbing ambient light, thereby affecting the amount of ambient light absorbed by the pixel definition layer 1. If the ratio of the thickness of the reflective layer 2 to the depth of the opening 11 is too small, the thickness of the reflective layer 2 is too small or the thickness of the pixel definition layer 1 is too large; if the thickness of the reflective layer 2 is too small, the reflective ability of the reflective layer 2 is too small, so that less ambient light enters the pixel definition layer 1 and is absorbed by the pixel definition layer 1, and the amount of ambient light emitted from the display side cannot be effectively reduced, and the contrast of the display panel 9 cannot be effectively improved; and if the thickness of the pixel definition layer 1 is too large, the thickness of the display panel 9 is too large, which is not conducive to the thinness of the display panel 9. If the ratio of the thickness of the reflective layer 2 to the depth of the opening 11 is too large, the sidewall area of ​​the pixel defining layer 1 for absorbing ambient light is too small, thereby failing to effectively reduce the amount of ambient light emitted from the display side, and further failing to effectively improve the contrast of the display panel 9 .

[0079] This embodiment limits the ratio of the thickness of the reflective layer 2 to the depth of the opening 11 within the range of 0.015 to 0.5, which can not only effectively reduce the amount of ambient light emitted from the display side, thereby effectively improving the contrast of the display panel 9, but also facilitate the thinning of the display panel 9.

[0080] In one embodiment, the ratio of the thickness of the reflective layer 2 to the depth of the opening 11 is in the range of 0.015-0.2.

[0081] For example, the thickness of the reflective layer can be 0.05µm to 0.1µm, such as 0.05µm, 0.06µm, 0.07µm, 0.08µm, 0.09µm or 0.1µm; the depth of the opening can be 0.5µm to 3µm, such as 0.5µm, 1µm, 1.5µm, 2µm, 2.5µm or 3µm.

[0082] In one embodiment, see Figure 3 The optical adhesive layer 5 is located on the side of the light emitting device layer 8 away from the substrate 3, the display side is located on the side of the optical adhesive layer 5 away from the substrate 3, and the optical adhesive layer 5 covers the pixel area and the non-pixel area.

[0083] After the ambient light is irradiated to the display side, it first passes through the optical adhesive layer 5, a part of the ambient light is absorbed by the optical adhesive layer 5, and the other part of the ambient light is irradiated to the surface of the reflective layer 2 and the surface of the cathode layer 47 through the optical adhesive layer 5; wherein, the ambient light irradiated to the reflective layer 2 is reflected on the surface of the reflective layer 2, and at least part of the ambient light after reflection is irradiated to the pixel defining layer 1 and absorbed by the pixel defining layer 1; the ambient light irradiated to the cathode layer 47 is reflected on the surface of the cathode layer 47 and emitted from the display side. It can be seen that the setting of the optical adhesive layer 5 can further increase the absorption amount of ambient light, thereby further improving the contrast of the display panel 9 and further improving the display effect of the display panel 9.

[0084] In one embodiment, see Figure 3 The display panel 9 further includes a transparent encapsulation layer 6 and a transparent protective film 7. The transparent encapsulation layer 6 is located on the side of the pixel defining layer 1 and the light emitting device 4 away from the substrate 3, that is, the transparent encapsulation layer 6 is located on the side of the light emitting device layer 8 away from the substrate 3, the optical adhesive layer 5 is located on the side of the transparent encapsulation layer 6 away from the substrate 3, and the transparent protective film 7 is located on the side of the optical adhesive layer 5 away from the substrate 3. The optical adhesive layer 5 can fix the transparent protective film 7 in the display panel 9.

[0085] It should be noted that in order to reduce the influence of ambient light on the display effect of the display panel 9, a circular polarizer is provided in the existing display panel 9. The circular polarizer is located on the side of the transparent encapsulation layer away from the substrate, and the transparent protective film is fixed to the surface of the circular polarizer away from the substrate through a transparent adhesive layer. The total light transmittance of the circular polarizer and the transparent adhesive layer is about 43%, that is, the light transmittance of the optical adhesive layer 5 is greater than the total light transmittance of the circular polarizer and the transparent adhesive layer. Therefore, the driving current of the display panel 9 in the present disclosure is less than the driving current of the existing display panel 9, which reduces the power consumption of the display panel 9. At the same time, replacing the circular polarizer and the transparent adhesive layer with the optical adhesive layer 5 reduces one film layer, which not only reduces the cost of the display panel 9, but also makes the display panel 9 thinner.

[0086] In a second aspect, this embodiment provides a method for preparing a display panel 9, see Figure 4 Combined with Figure 1 , the method for preparing the display panel 9 provided in the embodiment of the present disclosure includes:

[0087] Step S1: forming a pixel definition layer, wherein a non-pixel region of the pixel definition layer has a plurality of openings;

[0088] Step S2: forming a reflective layer in the opening, wherein the thickness of the reflective layer is less than the depth of the opening, and the reflective layer is used to reflect ambient light incident from the display side of the display panel, so that at least part of the ambient light is irradiated into the pixel defining layer and absorbed by the pixel defining layer;

[0089] S3: forming an optical adhesive layer on one side of the pixel defining layer, wherein the optical adhesive layer has a light transmittance greater than the light transmittance of the pixel defining layer.

[0090] The method for preparing the above-mentioned display panel is to form a pixel defining layer with a plurality of openings, and to form a reflective layer in the openings, and to form an optical adhesive layer on one side of the pixel defining layer, so that ambient light irradiates the display panel from the display side, and part of the ambient light is absorbed by the optical adhesive layer, and part of the ambient light emitted from the optical adhesive layer directly irradiates the pixel defining layer through the openings and is absorbed by the pixel defining layer, and at the same time, part of the ambient light emitted from the optical adhesive layer irradiates the surface of the reflective layer, and will be reflected on the surface of the reflective layer, and at least part of the ambient light after reflection irradiates the pixel defining layer and is absorbed by the pixel defining layer. In summary, the arrangement of the pixel defining layer, the reflective layer, and the optical adhesive layer reduces the amount of ambient light emitted from the display side, thereby reducing the influence of ambient light on the display effect of the display panel 9, improving the contrast of the display panel, and improving the display effect of the display panel.

[0091] In one embodiment, the light transmittance of the pixel defining layer 1 is 0%-10%; for example, the light transmittance of the pixel defining layer 1 may be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%;

[0092] The light transmittance of the optical adhesive layer 5 is 40%-60%. For example, the light transmittance of the optical adhesive layer 5 is 40%, 43%, 45%, 48%, 50%, 53%, 55%, 58% or 60%.

[0093] In one embodiment, the pixel definition layer 1 is black; the optical adhesive layer 5 is black.

[0094] In one embodiment, the thickness of the optical adhesive layer 5 is 20 μm-200 μm. For example, the optical adhesive layer 5 can be 20 μm, 40 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm or 200 μm.

[0095] In one embodiment, see Figure 5 Combined with Figure 2 In step S1, forming the pixel defining layer 1 includes the following steps:

[0096] Step S11, providing a substrate 3, and forming a pixel definition material layer on one side of the substrate 3;

[0097] Step S12 , patterning the pixel definition material layer to remove the pixel definition material in the pixel area to form a plurality of pixel definition holes 12 , and to remove part of the pixel definition material in the non-pixel area to form a plurality of openings 11 , thereby obtaining a pixel definition layer 1 .

[0098] In one embodiment, after forming the pixel definition layer 1 and before forming the optical adhesive layer 5, the following steps are further performed:

[0099] Step S4: A light-emitting device 4 is formed in the pixel definition hole 12 , wherein the light-emitting device 4 includes an anode layer 41 and a cathode layer 47 that are relatively arranged. The cathode layer 47 is located on the side of the anode layer 41 away from the substrate 3 , and the cathode layer 47 also extends to cover the surface of the pixel definition layer 1 on the side away from the substrate 3 .

[0100] In this embodiment, see Figure 1 The step of forming the light emitting device 4 in the pixel area includes: depositing anode material, hole transport material, light emitting material and electron transport material in the pixel area in sequence to form an anode layer 41, a hole transport layer 43, a light emitting layer 44 and an electron transport layer 45 in sequence, and the anode layer 41 is located on the surface of the substrate 3; after forming the electron transport layer 45, depositing cathode material in the pixel area and the non-pixel area to form a cathode layer 47 and a reflective layer 2 located in the opening 11, and the cathode layer 47 and the reflective layer 2 are formed at the same time, and the reflective layer 2 and the cathode layer 47 have the same material and thickness. The reflective layer 2 can also be prepared by other processes.

[0101] In some other embodiments, see Figure 1 The step of forming the light-emitting device 4 in the pixel area also includes: after forming the anode layer 41, forming a hole injection layer 42 on the surface of the anode layer 41 away from the substrate 3, and forming a hole transport layer 43 on the surface of the hole injection layer 42 away from the substrate 3; after forming the electron transport layer 45, forming an electron injection layer 46 on the surface of the electron transport layer 45 away from the substrate 3, and the cathode layer 47 is located on the surface of the electron injection layer 46 away from the substrate 3.

[0102] In one embodiment, see Figure 3 The method for preparing the display panel 9 further includes: after forming the light-emitting device 4, forming a transparent encapsulation layer 6 on the side of the pixel defining layer 1 and the light-emitting device 4 away from the substrate 3, that is, the transparent encapsulation layer 6 is formed on the surface of the light-emitting device layer 8 away from the substrate 3.

[0103] In one embodiment, the step S3 of forming the optical adhesive layer 5 includes:

[0104] Step S31, coating a black optical adhesive on the surface of the transparent encapsulation layer 6 facing away from the substrate 3;

[0105] Step S32, covering the surface of the black optical adhesive with a transparent protective film 7, and removing air bubbles between the black optical adhesive and the transparent protective film 7;

[0106] Step S33, curing the black optical adhesive to obtain an optical adhesive layer 5.

[0107] Compared with the arrangement of circular polarizers in the display panel 9, the solution of the optical adhesive layer reduces a polarization pasting process, which is beneficial to improving the manufacturing efficiency of the display panel 9. At the same time, since there is an alignment error in the pasting of the polarizer, the frame of the display panel 9 needs to reserve space for this error when designing; while there is no alignment error in the coating of the optical adhesive layer, the frame of the display panel 9 does not need to reserve additional space when designing, which reduces the size of the frame, thereby reducing the volume of the display panel 9.

[0108] Thirdly, refer to Figure 6 As shown, an embodiment of the present application provides a display device 10, comprising a display panel 9 according to any one of the above embodiments.

[0109] The display device 10 can be a laptop computer, a mobile phone, a wireless device, a personal digital assistant (PDA), a handheld or portable computer, a GPS receiver / navigator, a camera, an MP4 video player, a camcorder, a game console, a watch, a clock, a calculator, a television monitor, a flat-panel display, a computer monitor, a car display (e.g., an odometer display, etc.), a navigator, a cockpit controller and / or display, a display of a camera view (e.g., a display of a rearview camera in a vehicle), an electronic photo, an electronic billboard or sign, a projector, etc.

[0110] In the above-mentioned display device 10, ambient light irradiates the display device 10 from the display side, part of the ambient light is absorbed by the optical adhesive layer 5, part of the ambient light emitted from the optical adhesive layer 5 directly irradiates the pixel defining layer 1 through the opening 11 and is absorbed by the pixel defining layer 1, and at the same time, part of the ambient light emitted from the optical adhesive layer 5 irradiates the surface of the reflective layer 2, and will be reflected on the surface of the reflective layer 2, and at least part of the ambient light after reflection irradiates the pixel defining layer 1 and is absorbed by the pixel defining layer 1. In summary, the arrangement of the pixel defining layer 1, the reflective layer 2 and the optical adhesive layer 5 reduces the amount of ambient light emitted from the display side, thereby reducing the influence of ambient light on the display effect of the display device 10, improving the contrast of the display device 10, and improving the display effect of the display device 10.

[0111] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0112] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A display panel, characterized in that: include: A pixel defining layer, wherein a non-pixel region of the pixel defining layer has a plurality of openings; a reflective layer, the reflective layer being located in the opening and having a thickness less than a depth of the opening, the reflective layer being used to reflect ambient light incident from a display side of the display panel, so that at least a portion of the ambient light is irradiated into the pixel defining layer and absorbed by the pixel defining layer; An optical adhesive layer is located on one side of the pixel defining layer, and the optical adhesive layer has a light transmittance greater than that of the pixel defining layer.

2. The display panel according to claim 1, characterized in that: The light transmittance of the pixel defining layer is 0%-10%; the light transmittance of the optical adhesive layer is 40%-60%; Preferably, the pixel definition layer is black; the optical adhesive layer is black; Preferably, the thickness of the optical adhesive layer is 20 μm-200 μm.

3. The display panel according to claim 1, characterized in that: The pixel definition layer also has a plurality of pixel definition holes located in the pixel area; the display panel also includes: A substrate, wherein the pixel defining layer and the optical adhesive layer are stacked on one side of the substrate; A plurality of light-emitting devices, wherein the light-emitting devices are located in the pixel definition hole, and the light-emitting devices include an anode layer and a cathode layer that are arranged opposite to each other, and a light-emitting layer located between the anode layer and the cathode layer; The cathode layer is located on a side of the light emitting layer away from the anode layer, and the cathode layer extends to cover a surface of a side of the pixel defining layer away from the substrate, and the reflective layer is made of the same material as the cathode layer.

4. The display panel according to claim 3, characterized in that: The ratio of the total area of ​​the orthographic projections of the plurality of reflective layers on the substrate to the area of ​​the non-pixel region is in the range of 0.5-0.7; Preferably, along the direction away from the pixel area, the area of ​​the orthographic projection of the opening on the surface of the substrate gradually decreases; and / or, along the direction away from the pixel area, the density of the opening gradually increases.

5. The display panel according to claim 1, characterized in that: The opening is a through hole or a blind hole, and the ratio of the thickness of the reflective layer to the depth of the opening is in the range of 0.015 to 0.5; Preferably, the thickness of the reflective layer is 0.05µm-0.1µm, and the depth of the opening is 0.5µm-3µm.

6. A method for preparing a display panel, characterized in that: include: forming a pixel defining layer, wherein a non-pixel region of the pixel defining layer has a plurality of openings; forming a reflective layer in the opening, wherein the thickness of the reflective layer is less than the depth of the opening, and the reflective layer is used to reflect ambient light incident from the display side of the display panel, so that at least part of the ambient light is irradiated into the pixel defining layer and absorbed by the pixel defining layer; An optical adhesive layer is formed on one side of the pixel defining layer, and the light transmittance of the optical adhesive layer is greater than the light transmittance of the pixel defining layer.

7. The method for preparing a display panel according to claim 6, characterized in that: The light transmittance of the pixel defining layer is 0%-10%; the light transmittance of the optical adhesive layer is 40%-60%; Preferably, the pixel definition layer is black; the optical adhesive layer is black; Preferably, the thickness of the optical adhesive layer is 20 μm-200 μm.

8. The method for preparing a display panel according to claim 6, characterized in that: The step of forming a pixel defining layer comprises: Providing a substrate, and forming a pixel definition material layer on one side of the substrate; The pixel definition material layer is patterned to remove the pixel definition material in the pixel area to form a plurality of pixel definition holes, and to remove part of the pixel definition material in the non-pixel area to form a plurality of openings, thereby obtaining the pixel definition layer.

9. The method for preparing a display panel according to claim 8, characterized in that: After forming the pixel defining layer and before forming the optical adhesive layer, the method further includes: A light-emitting device is formed in the pixel definition hole, the light-emitting device includes an anode layer and a cathode layer that are relatively arranged, and a light-emitting layer located between the anode layer and the cathode layer; the cathode layer is located on a side of the light-emitting layer away from the anode layer, and the cathode layer extends to cover a side surface of the pixel definition layer away from the substrate; wherein the step of forming the cathode layer includes: depositing cathode material in the pixel area and the non-pixel area to form the cathode layer and a reflective layer located in the opening.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 5.

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