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 display function layer which comprises a light-emitting device layer and a pixel definition layer which are arranged in a stacked mode, and the pixel definition layer is provided with a pixel opening used for light emitting of a light-emitting device; the dimming part is arranged on the side, away from the light-emitting device layer, of the pixel definition layer, and the orthographic projection of the dimming part on the pixel definition layer is aligned with the pixel opening; the first optical adhesive layer covers the top of the part, far away from the display function layer, of the dimming part, and an optical opening for exposing the top of the other part of the dimming part is formed in the first optical adhesive layer; the second optical adhesive layer is filled in the optical opening of the first optical adhesive layer and covers the surface of one side, far away from the display function layer, of the first optical adhesive layer; wherein a first interface is formed between the dimming part and the second optical adhesive layer, a second interface is formed between the dimming part and the first optical adhesive layer, and a third interface is formed between the first optical adhesive layer and the second optical adhesive layer.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular, to a display panel and a method for preparing the same, and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) has the advantages of active light emission, light weight, fast response speed, good stability, low driving voltage, rich material variety, and high contrast. Today, the internal quantum efficiency of OLED devices has reached an extremely high level, while the light extraction efficiency is between 20% and 30%. Since the external quantum efficiency = internal quantum efficiency × light extraction efficiency, the light extraction efficiency greatly limits the development of OLED display panels. Summary of the invention

[0003] Based on this, it is necessary to provide a display panel and a manufacturing method thereof and a display device that can improve light extraction efficiency in order to address the above technical problems.

[0004] In a first aspect, the present application provides a display panel, comprising:

[0005] The display function layer comprises a light emitting device layer and a pixel definition layer which are stacked, wherein the pixel definition layer is provided with a pixel opening for the light emitting device to emit light;

[0006] A dimming unit is disposed on a side of the pixel definition layer away from the light emitting device layer, and the orthographic projection of the dimming unit on the pixel definition layer is aligned with the pixel opening;

[0007] A first optical adhesive layer covers a portion of the top of the dimming unit away from the display function layer and is formed with an optical opening exposing another portion of the top of the dimming unit;

[0008] A second optical adhesive layer, filling the optical opening of the first optical adhesive layer and covering the surface of the first optical adhesive layer away from the display function layer;

[0009] Among them, a first interface is formed between the dimming part and the second optical adhesive layer, a second interface is formed between the dimming part and the first optical adhesive layer, and a third interface is formed between the first optical adhesive layer and the second optical adhesive layer. The light beam emitted by the light-emitting device is emitted through at least one of the first interface, the second interface and the third interface.

[0010] In one embodiment, the refractive index of the second optical adhesive layer is lower than the refractive index of the light modulating portion, and higher than the refractive index of the first optical adhesive layer;

[0011] Preferably, a part of the light beams emitted by the light-emitting device is incident vertically on the first interface and exits, or exits after refraction at the first interface;

[0012] Preferably, a part of the light beams emitted by the light-emitting device are sequentially refracted at the first interface and exit after total reflection at the second interface;

[0013] Preferably, a part of the light beams emitted by the light-emitting device are sequentially refracted at the second interface and exit after refraction at the third interface.

[0014] In one embodiment, it further includes:

[0015] A touch function layer is provided on the side of the pixel definition layer away from the light-emitting device layer. The touch function layer includes a touch insulating layer and a plurality of touch wiring layers. The touch insulating layer includes an insulating portion, and the insulating portion is used to isolate different touch wiring layers;

[0016] Wherein, the dimming portion is arranged on the same layer as the insulating portion and is staggered from each other in the touch insulating layer.

[0017] In one embodiment, the cross-sectional shape of the dimming portion is a regular trapezoid, and the cross-sectional shape of the optical opening of the first optical glue layer is an inverted trapezoid.

[0018] In one embodiment, the boundary distance between the positive projection of the surface of the dimming portion close to the display function layer on the pixel definition layer and the pixel opening is 0 to 5 μm;

[0019] Preferably, the boundary distance between the positive projection of the surface of the second optical glue layer close to the first optical glue layer on the pixel definition layer and the pixel opening is 0 to 5 μm.

[0020] In one embodiment, the width of the surface of the dimming portion away from the display function layer is greater than the width of the surface of the second optical glue layer close to the dimming portion.

[0021] In one embodiment, the included angle between the surface of the dimming portion close to the display function layer and the second interface is between 50° and 80°;

[0022] Preferably, the included angle between the surface of the dimming portion away from the display function layer and the third interface is less than 80°.

[0023] In one embodiment, the thickness of the dimming portion is greater than 0.3 μm;

[0024] Preferably, the thickness of the second optical glue layer in the optical opening of the first optical glue layer is greater than 3 μm.

[0025] In one embodiment, the second optical adhesive layer further covers the surface of the first optical adhesive layer on the side away from the display function layer.

[0026] Second, the present application provides a method for manufacturing a display panel, which is characterized by including:

[0027] Forming a light-emitting function layer including a light-emitting device layer and a pixel definition layer arranged in a stacked manner; the pixel definition layer is provided with a pixel opening for the light-emitting device to emit light;

[0028] Forming a light-adjusting part on the side of the pixel definition layer facing away from the light-emitting device layer; the orthographic projection of the light-adjusting part on the pixel definition layer is aligned with the pixel opening;

[0029] Forming a first optical adhesive layer; the first optical adhesive layer covers a part of the top of the light-adjusting part away from the display function layer and forms an optical opening exposing another part of the top of the light-adjusting part;

[0030] Forming a second optical adhesive layer, the second optical adhesive layer fills the optical opening of the first optical adhesive layer and covers the surface of the first optical adhesive layer on the side away from the display function layer;

[0031] Wherein, a first interface is formed between the light-adjusting part and the second optical adhesive layer, a second interface is formed between the light-adjusting part and the first optical adhesive layer, a third interface is formed between the first optical adhesive layer and the second optical adhesive layer, and the light beam emitted by the light-emitting device exits through at least one of the first interface, the second interface, and the third interface.

[0032] Third, the present application provides a display device including the display panel as described above.

[0033] In the above display panel, its manufacturing method, and the display device, by providing a light-adjusting part, a first optical adhesive layer, and a second optical adhesive layer on the light-emitting side of the light-emitting device to form multiple optical interfaces, the light beam emitted by the light-emitting device can be respectively incident on different optical interfaces, and refraction or total reflection occurs on the optical interfaces, so that the first included angle between the light beam exiting from the optical interface and the front view angle of the display panel is smaller than the second included angle between the light beam incident on the optical interface and the front view angle of the display panel, realizing the adjustment of the light-emitting path of the light-emitting device and improving the light extraction efficiency. Moreover, by forming multiple optical interfaces through multiple film layers, the influence of the defect of a single optical interface on the light-emitting path can be reduced, thereby reducing the influence of process fluctuations on the light output of the display panel and improving the tolerance to process fluctuations. Description of the Drawings

[0034] To more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 One of the schematic structural diagrams of a display panel according to an embodiment;

[0036] Figure 2 The optical path schematic diagram of a display panel according to an embodiment;

[0037] Figure 3 Another schematic structural diagram of a display panel according to an embodiment;

[0038] Figure 4 The schematic diagram of the structural parameters according to an embodiment;

[0039] Figure 5 The brightness comparison diagram of a display panel with or without MLA and TIP set according to an embodiment;

[0040] Figure 6 The brightness comparison diagram of a display panel with TIP having different first outward expansion distances A1 according to an embodiment;

[0041] Figure 7 The brightness comparison diagram of a display panel with TIP having different first included angles B1 according to an embodiment;

[0042] Figure 8 The brightness comparison diagram of a display panel with MLA having different second outward expansion distances A2 according to an embodiment;

[0043] Figure 9 The brightness comparison diagram of a display panel with MLA having different second included angles B2 according to an embodiment;

[0044] Figure 10 The flowchart of the manufacturing method of a display panel according to an embodiment;

[0045] Figure 11 The schematic structural diagram of a display panel after depositing a touch wiring layer and a touch insulating layer according to an embodiment;

[0046] Figure 12 The schematic structural diagram of a display panel after forming a dimming part and an insulating part according to an embodiment;

[0047] Figure 13 The schematic structural diagram of a display panel after forming a first optical adhesive layer according to an embodiment;

[0048] Figure 14 Schematic structural diagram of a display panel after forming an optical aperture in an embodiment.

[0049] Element label description:

[0050] Pixel aperture: 101; Encapsulation layer: 102; Touch function layer: 200; Touch insulation layer: 201; Touch trace layer: 202; Dimming part: 210; Insulation part: 220; First optical adhesive layer: 300; Second optical adhesive layer: 400. Detailed implementation manners

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0052] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first optical adhesive layer 300 can be called the second optical adhesive layer 400, and similarly, the second optical adhesive layer 400 can be called the first optical adhesive layer 300.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. The meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0054] An embodiment of the present application provides a display panel. Figure 1 One of the schematic structural diagrams of the display panel in an embodiment, refer to Figure 1 , the display panel includes a display function layer, a dimming part 210, a first optical adhesive layer 300 and a second optical adhesive layer 400.

[0055] The display functional layer includes a light-emitting device layer and a pixel definition layer which are stacked. The light-emitting device layer includes a plurality of light-emitting units arranged in an array, and each light-emitting unit includes a plurality of light-emitting devices respectively. The pixel definition layer is provided with pixel openings 101 for the light-emitting devices to emit light. The plurality of pixel openings 101 in the pixel definition layer are respectively arranged in one-to-one correspondence with the plurality of light-emitting devices and can isolate adjacent light-emitting devices. Further, a three-layer encapsulation layer 102 of organic + inorganic can be provided on the surface of the OLED light-emitting device layer to improve the stability of the OLED light-emitting material. For example, the three-layer encapsulation layer 102 of inorganic + organic + inorganic includes CVD1 / IJP / CVD2 which are stacked.

[0056] The dimming part 210 is provided on the side of the pixel definition layer facing away from the light-emitting device layer. The first optical adhesive layer 300 covers a part of the top of the dimming part 210 away from the display functional layer and forms an optical opening exposing another part of the top of the dimming part 210. The second optical adhesive layer 400 is filled in the optical opening of the first optical adhesive layer 300. The second optical adhesive layer 400 filled in the optical opening can be called a microlens (Microlens, MLA).

[0057] The refractive indices of the first optical adhesive layer 300, the second optical adhesive layer 400 and the dimming part 210 are different from each other. Optionally, the material of the first optical adhesive layer 300 includes but is not limited to polyimide, and the material of the second optical adhesive layer 400 includes but is not limited to polyimide doped with high refractive index particles. The material of the dimming part 210 can include but is not limited to at least one of SiO, SiON and SiNx.

[0058] In the related art, on the light-emitting path of a light-emitting device, a structure for adjusting the light path is usually not provided. Therefore, the light beam emitted by the light-emitting device will directly exit to the outside of the display panel, resulting in a relatively large number of light beams exiting from a large viewing angle of the display panel. In this embodiment, by providing a first optical adhesive layer 300, a second optical adhesive layer 400, and a light-adjusting part 210 with different refractive indexes, a plurality of optical interfaces with refraction or total reflection functions can be formed. The plurality of optical interfaces specifically include a first interface formed between the light-adjusting part 210 and the second optical adhesive layer 400, a second interface formed between the light-adjusting part 210 and the first optical adhesive layer 300, and a third interface formed between the first optical adhesive layer 300 and the second optical adhesive layer 400. By providing a plurality of optical interfaces, the light beam emitted by the light-emitting device exits through at least one of the first interface, the second interface, and the third interface. That is, light beams at different angles from the same light-emitting device can exit through different light paths respectively, so as to realize the adjustment of the light-emitting angle, reduce the light beams exiting from a large viewing angle of the display panel, that is, increase the light beams exiting from a front viewing angle or a small viewing angle of the display panel, and improve the brightness of the display panel. At the same brightness, compared with a display panel without the above three optical interfaces, the display panel of this embodiment can have lower power consumption.

[0059] Further, the orthographic projection of the light-adjusting part 210 on the pixel definition layer is aligned with the pixel opening 101, that is, the orthographic projection of the center of the light-adjusting part 210 on the pixel definition layer coincides with the center of the pixel opening 101, so that the light-adjusting part 210 uniformly adjusts the light beam emitted by the corresponding light-emitting device.

[0060] It can be understood that if only one of the first optical adhesive layer 300 and the second optical adhesive layer 400 is provided, the process stability of this optical adhesive layer will greatly affect the light extraction efficiency. However, in this embodiment, the first optical adhesive layer 300 and the second optical adhesive layer 400 are combined. Even if the process of one optical adhesive layer is unstable and the morphology of the corresponding optical interface cannot meet the light-adjusting requirements, it can be compensated by the other optical adhesive layer, so that the light beam will not deviate too much from the preset direction, thereby improving the tolerance of the display panel to process fluctuations.

[0061] In the embodiments of the application, by disposing a dimming portion 210, a first optical adhesive layer 300, and a second optical adhesive layer 400 on the light-emitting side of the light-emitting device to form a plurality of optical interfaces, the light beam emitted by the light-emitting device can be incident on different optical interfaces respectively, and refraction or total reflection occurs on the optical interfaces, so that a first included angle between the light beam exiting from the optical interface and the front view angle of the display panel is smaller than a second included angle between the light beam incident on the optical interface and the front view angle of the display panel, realizing the adjustment of the light-emitting path of the light-emitting device and improving the light extraction efficiency. Moreover, by forming a plurality of optical interfaces through a plurality of film layers, the influence of the defect of a single optical interface on the light-emitting path can be reduced, thereby reducing the influence of process fluctuations on the light output of the display panel and improving the tolerance to process fluctuations.

[0062] In one of the embodiments, continue to refer to Figure 1 , the second optical adhesive layer 400 also covers the surface of the first optical adhesive layer 300 on the side away from the display functional layer. The above setting can achieve surface planarization, thereby facilitating the further setting of other film layers on the surface of the second optical adhesive layer 400 and ensuring the flatness of the set film layers. Optionally, the thickness of the second optical adhesive layer 400 on the surface of the first optical adhesive layer 300 on the side away from the display functional layer can be 5um to 20um, such as 5um, 7um, 10um, 20um, etc.

[0063] In one of the embodiments, the refractive index of the second optical adhesive layer 400 is lower than that of the dimming portion 210 and higher than that of the first optical adhesive layer 300. Therefore, when the light beam is incident from the dimming portion 210 to the second optical adhesive layer 400, refraction occurs at the first interface. When the light beam is incident from the dimming portion 210 to the first optical adhesive layer 300, refraction occurs at the second interface. When the light beam is incident from the first optical adhesive layer 300 to the second optical adhesive layer 400, refraction occurs at the third interface. When the light beam is incident from the second optical adhesive layer 400 to the first optical adhesive layer 300 and meets the incident angle requirement, total reflection occurs at the third interface.

[0064] Figure 2 is a schematic diagram of the optical path of a display panel in an embodiment. Refer to Figure 2, part of the light beam emitted by the light-emitting device is vertically incident on the first interface and emerges, or emerges after being refracted at the first interface. Specifically, part of the light beam emitted by the light-emitting device with a smaller front viewing angle emerges along the above-mentioned optical path. Part of the light beam emitted by the light-emitting device is refracted at the first interface in turn, and emerges after being totally reflected at the second interface. Specifically, part of the light beam emitted by the light-emitting device with a middle front viewing angle emerges along the above-mentioned optical path. Part of the light beam emitted by the light-emitting device is refracted at the second interface in turn, and emerges after being refracted at the third interface. Specifically, part of the light beam emitted by the light-emitting device with a larger front viewing angle emerges along the above-mentioned optical path. Therefore, this embodiment can adjust the emergent light of each angle of the light-emitting device separately, especially by setting the second interface, it can reduce the total reflection of part of the large viewing angle light beam at the first interface, and concentrate the light beam to emerge at the front viewing angle or small viewing angle, thereby improving the light extraction efficiency.

[0065] Figure 3 FIG. 2 is a schematic diagram of a structure of a display panel according to an embodiment of the present invention. Figure 3 In one embodiment, the display panel further includes a touch function layer 200. The touch function layer 200 is disposed on the side of the pixel definition layer away from the light-emitting device layer, and the touch function layer 200 includes a touch insulation layer 201 and a plurality of touch wiring layers 202. Specifically, the touch function layer 200 may include two touch wiring layers 202. The two touch wiring layers 202 are respectively used to set touch transmitting electrodes and touch receiving electrodes to support the mutual capacitance touch function of the display panel. The touch insulation layer 201 includes an insulation part 220, and the insulation part 220 is used to isolate different touch wiring layers 202 to avoid short circuits of electrodes in different touch wiring layers 202. Among them, the dimming part 210 is disposed in the same layer as the insulation part 220, and is staggered in the touch insulation layer 201. The dimming part 210 disposed in the same layer as the insulation layer can be called a TP insulation layer patterned (TIP) structure. Accordingly, the dimming part 210 and the insulating part 220 can be implemented in the same process flow, thereby not increasing the preparation process and saving development costs.

[0066] In one embodiment, the cross-sectional shape of the dimming unit 210 is a regular trapezoid, and the cross-sectional shape of the optical opening of the first optical adhesive layer 300 is an inverted trapezoid. The above configuration makes the second interface and the third interface both plane, which not only reduces the difficulty of preparing the optical opening of the dimming unit 210 and the first optical adhesive layer 300, but also facilitates the optical path design, so that more light beams can be emitted from the normal viewing angle or small viewing angle of the display panel.

[0067] In one embodiment, the boundary distance between the orthographic projection of the surface of the dimming unit 210 close to the display function layer on the pixel definition layer and the pixel opening 101 is 0 to 5 um. Figure 4 is a schematic diagram of structural parameters of an embodiment, refer toFigure 4 The boundary distance between the positive projection of the surface of the light dimming part 210 close to the display function layer on the pixel definition layer and the pixel opening 101 can be referred to as the first outward expansion distance A1. For example, the first outward expansion distance A1 is 0.5um, 1um, 1.5um, 2.5um, 5um, etc. It can be understood that if the first outward expansion distance A1 is too small, a large proportion of the light beam from the light emitting device will not be able to enter the light dimming part 210 for optical path adjustment. If the first outward expansion distance A1 is too large, the incident light at a large viewing angle is likely to undergo total internal reflection within the light dimming part 210. Therefore, by setting an appropriate first outward expansion distance A1, the light beam from the light emitting device can be made to enter the light dimming part 210 as much as possible, and the light beam incident on the light dimming part 210 can be made to exit from the second interface, reducing the total internal reflection phenomenon inside the light dimming part 210.

[0068] In one embodiment, the boundary distance between the positive projection of the surface of the second optical glue layer 400 close to the first optical glue layer 300 on the pixel definition layer and the pixel opening 101 is 0 to 5um. Among them, the boundary distance between the positive projection of the surface of the second optical glue layer 400 close to the first optical glue layer 300 on the pixel definition layer and the pixel opening 101 can be referred to as the second outward expansion distance A2. For example, the second outward expansion distance A2 is 0.5um, 1um, 1.5um, 2.5um, 5um, etc. It can be understood that if the second outward expansion distance A2 is too small, a large proportion of the light beam from the light dimming part 210 will not be able to enter the light dimming part 210 for optical path adjustment. If the second outward expansion distance A2 is too large, part of the light beam from the light dimming part 210 will exit before reaching the third interface, and the optical path cannot be adjusted through total internal reflection at the third interface. Therefore, by setting an appropriate second outward expansion distance A2, the light beam from the light dimming part 210 can be made to enter the second optical glue layer 400 as much as possible, and the light beam incident on the second optical glue layer 400 can be made to exit from the front view angle or small view angle of the display panel.

[0069] In one embodiment, the first included angle B1 between the surface of the light dimming part 210 close to the display function layer and the second interface is between 50° and 80°. For example, the first included angle B1 is 50°, 70°, 80°, etc. By setting an appropriate first included angle B1, the incident angle of the light beam from the light emitting device when it enters the second interface can be changed, thereby changing the exit angle after refraction at the second interface, enabling the light beam to be further transmitted to the second optical glue layer 400 for optical path adjustment to improve the light extraction efficiency.

[0070] In one embodiment, the second angle B2 between the surface of the light-dimming part 210 on the side away from the display function layer and the third interface is less than 80°. For example, the second angle B2 is 50°, 70°, 80°, etc. By setting an appropriate second angle B2, the incident angle of the light beam from the light-emitting device when it reaches the third interface can be changed, so that the light beam from the second optical adhesive layer 400 can undergo total internal reflection at the third interface and then exit from the front view or a small view angle. Additionally, the incident angle of the light beam from the first optical adhesive layer 300 when it reaches the third interface can be changed, thereby changing the exit angle after refraction at the third interface to improve the light extraction efficiency.

[0071] In one embodiment, the thickness C1 of the light-dimming part 210 is greater than 0.3 um. For example, the thickness of the light-dimming part 210 is 0.5 um, 1 um, etc.

[0072] In one embodiment, the thickness of the second optical adhesive layer 400 in the optical opening of the first optical adhesive layer 300 is greater than 3 um. For example, the thickness C2 of the second optical adhesive layer 400 in the optical opening of the first optical adhesive layer 300 is 5 um, 10 um, 15 um, etc. Further, in the case where the second optical adhesive layer 400 is also formed on the surface of the first optical adhesive on the side away from the display function layer, the total thickness of the second optical adhesive layer 400 is 10 um to 20 um. For example, the total thickness of the second optical adhesive layer 400 is 10 um, 15 um, 20 um, etc. In the embodiments of the application, by setting an appropriate total thickness of the second optical adhesive layer 400, both the effective adjustment of the light path can be ensured, and the situation of the excessive thickness of the display panel can be avoided, thereby providing a thin, light, and high-brightness display panel.

[0073] In one embodiment, the parameters of the light-dimming part 210, the first optical adhesive layer 300, and the second optical adhesive layer 400 corresponding to light-emitting devices of different colors are not completely the same. Among them, the parameters of the light-dimming part 210 include but are not limited to the refractive index, the thickness C1, the first outward expansion distance A1, and the first angle B1. The parameters of the first optical adhesive layer 300 include but are not limited to the refractive index and the thickness. The parameters of the second optical adhesive layer 400 include but are not limited to the refractive index, the thickness C2, the second outward expansion distance A2, and the second angle B2. It can be understood that the wavelengths of light-emitting devices of different colors are different, so there will be certain differences in the light paths in the light-dimming part 210, the first optical adhesive layer 300, and the second optical adhesive layer 400. Through the differential parameter settings, each color of light-emitting device can have good performance at the front view or a small view angle.

[0074] Figure 5 It is a brightness comparison diagram of a display panel with or without MLA and TIP in one embodiment. Refer to Figure 5 , Figure 5The contrast data of the brightness and brightness improvement of the display panel are shown in four cases: when neither MLA nor TIP is set, only MLA is set, only TIP is set, and both MLA and TIP are set. In this embodiment, taking the first outward expansion distance A1 of TIP as 1.5um, the first included angle B1 as 70°, the second outward expansion distance A2 of MLA as 0.5um, and the second included angle B2 as 80° as an example, obviously, the promotion effect of MLA on the brightness of the display panel is better than that of TIP. And when both MLA and TIP are set, the brightness of the display panel can reach 237, which is 17.46% higher than the case when neither MLA nor TIP is set. That is to say, it can be considered that the power consumption is reduced by nearly 20%.

[0075] Figure 6 It is a brightness comparison diagram of the display panel with TIP having different first outward expansion distances A1 in an embodiment. Refer to Figure 6 , Figure 6 The contrast data of the brightness and brightness improvement of the display panel are shown in nine cases: when TIP is not set and the first outward expansion distances A1 are 0um, 0.5um, 1um, 1.5um, 2um, 2.5um, 3um, and 5um respectively. In this embodiment, taking the first included angle B1 of TIP as 70°, the second outward expansion distance A2 of MLA as 0.5um, and the second included angle B2 as 80° as an example, obviously, with the increase of the first outward expansion distance A1, the light extraction efficiency shows a continuous upward trend. After the first outward expansion distance A1 reaches 2um, the light extraction efficiency is basically stable at about 21%. It should be noted that the process fluctuation range allowed for the first outward expansion distance A1 is ±3.5um.

[0076] Figure 7 It is a brightness comparison diagram of the display panel with TIP having different first included angles B1 in an embodiment. Refer to Figure 7 , Figure 7 The contrast data of the brightness and brightness improvement of the display panel are shown in five cases: when TIP is not set and the first included angles B1 are 50°, 60°, 70°, and 80° respectively. In this embodiment, taking the first outward expansion distance A1 of TIP as 1.5um, the second outward expansion distance A2 of MLA as 0.5um, and the second included angle B2 as 80° as an example, obviously, with the increase of the first included angle B1, the light extraction efficiency shows a continuous downward trend, but the overall light extraction efficiency is greater than 15%. The current minimum process capability can reach 70°, and the actual efficiency improvement can reach 17.46%.

[0077] Figure 8 It is a brightness comparison diagram of the display panel with MLA having different second outward expansion distances A2 in an embodiment. Refer to Figure 8 , Figure 8The comparative data of the brightness and brightness improvement of the display panel are shown in eight cases where MLA is not set and the second expansion distance A2 is 0um, 0.5um, 1um, 1.5um, 2um, 2.5um and 3um respectively. In this embodiment, the first expansion distance A1 of the TIP is 1.5um, the first angle B1 is 70°, and the second angle B2 is 80°. Obviously, with the increase of the second expansion distance A2, the light extraction efficiency has a trend of continuous decrease. After the second expansion distance A2 is greater than 1um, the light extraction efficiency is basically stable at about 13%, and the light extraction efficiency is the highest when the second expansion distance A2 is 0.5um.

[0078] Figure 9 is a brightness comparison diagram of a display panel of an MLA with different second angles B2 according to an embodiment, referring to Figure 9 , Figure 9 The comparative data of the brightness and brightness improvement of the display panel are shown in five cases where MLA is not set and the second angle B2 is 50°, 60°, 70° and 80° respectively. In this embodiment, the first expansion distance A1 of TIP is 1.5um, the first angle B1 is 70°, and the second expansion distance A2 of MLA is 0.5um. Obviously, with the increase of the second angle B2, the light extraction efficiency has a trend of continuous decline, but the overall light extraction efficiency is greater than 12%. At present, the minimum process capability can reach 70 degrees, and the actual improvement efficiency can reach 12.35%.

[0079] The present application also provides a method for preparing a display panel. Figure 10 is a flow chart of a method for preparing a display panel according to an embodiment, referring to Figure 10 , the method for preparing the display panel includes steps S100 to S400.

[0080] Step S100 , forming a light-emitting function layer including a light-emitting device layer and a pixel definition layer stacked in layers.

[0081] The pixel definition layer is provided with a pixel opening 101 for the light emitting device to emit light. After the OLED light emitting device layer is evaporated, a three-layer encapsulation layer 102 of + organic + inorganic can be set on the surface of the OLED light emitting device layer to improve the stability of the OLED light emitting material. For example, the three-layer encapsulation layer of inorganic + organic + inorganic includes CVD1 / IJP / CVD2 stacked.

[0082] In step S200 , a dimming unit 210 is formed on a side of the pixel definition layer away from the light emitting device layer.

[0083] Among them, the orthographic projection of the light dimming part 210 on the pixel definition layer is aligned with the pixel opening 101. Specifically, the area above the pixel opening 101 can be patterned to remove excess material through a photolithography process, thereby forming a light dimming part 210 in the shape of a regular trapezoid. Further, when the display panel includes a touch function layer 200, a touch insulating layer 201 can be deposited on the encapsulation film layer first, then a first layer of patterned touch trace layer 202 is formed, and then another touch insulating layer 201 is deposited to form Figure 11 the structure shown, and the required light dimming part 210 and insulating part 220 are formed by patterning Figure 12 the structure shown.

[0084] Step S300: Form a first optical glue layer 300.

[0085] Among them, the first optical glue layer 300 covers a part of the top of the light dimming part 210 away from the display function layer, and an optical opening exposing another part of the top of the light dimming part 210 is formed. Specifically, the material of the first optical glue layer 300 can be coated above the light dimming part 210 and cover the exposed surfaces of the encapsulation layer 102 and the touch function layer 200 to form Figure 13 the structure shown, and then an inverted trapezoidal optical opening is formed by photolithography in the area above the pixel opening 101, and heating and curing are carried out to form Figure 14 the structure shown.

[0086] Step S400: Form a second optical glue layer 400.

[0087] Among them, the second optical glue layer 400 fills the optical opening of the first optical glue layer 300 and covers the surface of the first optical glue layer 300 on the side away from the display function layer. Specifically, through a printing process, the second optical glue layer 400 with a high refractive index can be printed into the optical opening and onto the surface of the first optical glue layer 300, and curing is carried out to form Figure 3 the structure shown to produce a planarization effect.

[0088] Among them, a first interface is formed between the light dimming part 210 and the second optical glue layer 400, a second interface is formed between the light dimming part 210 and the first optical glue layer 300, and a third interface is formed between the first optical glue layer 300 and the second optical glue layer 400. The light beam emitted by the light emitting device exits through at least one of the first interface, the second interface, and the third interface.

[0089] The embodiments of the present application further provide a display device, including the display panel as described above. Specifically, the display device may be, but is not limited to, various personal computers, laptop computers, smart phones, tablet computers, Internet of Things devices, and portable wearable devices. The Internet of Things devices may be smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, etc. The portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc.

[0090] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0091] The above embodiments only represent several implementation manners of the embodiments of the present application. The description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the embodiments of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application should be subject to the appended claims.

Claims

1. A display panel, characterized in that: include: The display function layer comprises a light emitting device layer and a pixel definition layer which are stacked, wherein the pixel definition layer is provided with a pixel opening for the light emitting device to emit light; A dimming unit is disposed on a side of the pixel definition layer away from the light emitting device layer, and the orthographic projection of the dimming unit on the pixel definition layer is aligned with the pixel opening; A first optical adhesive layer covers a portion of the top of the dimming unit away from the display function layer and is formed with an optical opening exposing another portion of the top of the dimming unit; a second optical adhesive layer, filling the optical opening of the first optical adhesive layer; Among them, a first interface is formed between the dimming part and the second optical adhesive layer, a second interface is formed between the dimming part and the first optical adhesive layer, and a third interface is formed between the first optical adhesive layer and the second optical adhesive layer. The light beam emitted by the light-emitting device is emitted through at least one of the first interface, the second interface and the third interface.

2. The display panel according to claim 1, characterized in that: The refractive index of the second optical adhesive layer is lower than the refractive index of the light modulating part, and higher than the refractive index of the first optical adhesive layer; Preferably, part of the light beam emitted by the light emitting device is vertically incident on the first interface and then emitted, or is refracted at the first interface and then emitted; Preferably, part of the light beam emitted by the light emitting device is refracted at the first interface in sequence, and is emitted after being totally reflected at the second interface; Preferably, part of the light beam emitted by the light emitting device is refracted at the second interface in sequence, and then emerges after being refracted at the third interface.

3. The display panel according to claim 1, characterized in that: Also includes: A touch function layer is provided on a side of the pixel definition layer away from the light emitting device layer, the touch function layer comprises a touch insulation layer and a plurality of touch wiring layers, the touch insulation layer comprises an insulation part, and the insulation part is used to isolate different touch wiring layers; The dimming part and the insulating part are arranged in the same layer and are staggered with each other in the touch insulating layer.

4. The display panel according to any one of claims 1 to 3, characterized in that: The cross-sectional shape of the light modulating portion is a regular trapezoid, and the cross-sectional shape of the optical opening of the first optical adhesive layer is an inverted trapezoid.

5. The display panel according to claim 4, characterized in that: The boundary distance between the orthographic projection of the surface of the dimming part close to the display function layer on the pixel definition layer and the pixel opening is 0 to 5 um; Preferably, a boundary distance between an orthographic projection of a surface of the second optical adhesive layer on a side close to the first optical adhesive layer on the pixel definition layer and the pixel opening is 0 to 5 um.

6. The display panel according to claim 4, characterized in that: The angle between the surface of the dimming part close to the display function layer and the second interface is between 50° and 80°; Preferably, an angle between a surface of the dimming portion away from the display function layer and the third interface is less than 80°.

7. The display panel according to claim 4, characterized in that: The thickness of the dimming part is greater than 0.3um; Preferably, the thickness of the second optical adhesive layer in the optical opening of the first optical adhesive layer is greater than 3 um.

8. The display panel according to claim 1, characterized in that: The second optical adhesive layer also covers a surface of the first optical adhesive layer that is away from the display function layer.

9. A method for preparing a display panel, characterized in that: include: forming a light-emitting function layer including a light-emitting device layer and a pixel definition layer stacked in layers; The pixel definition layer is provided with a pixel opening for the light emitting device to emit light; forming a dimming portion on a side of the pixel definition layer away from the light emitting device layer; The orthographic projection of the light modulating unit on the pixel definition layer is aligned with the pixel opening; forming a first optical adhesive layer; the first optical adhesive layer covers a portion of the top of the dimming unit away from the display function layer, and is formed with an optical opening exposing another portion of the top of the dimming unit; forming a second optical adhesive layer, wherein the second optical adhesive layer fills the optical opening of the first optical adhesive layer and covers the surface of the first optical adhesive layer away from the display function layer; Among them, a first interface is formed between the dimming part and the second optical adhesive layer, a second interface is formed between the dimming part and the first optical adhesive layer, and a third interface is formed between the first optical adhesive layer and the second optical adhesive layer. The light beam emitted by the light-emitting device is emitted through at least one of the first interface, the second interface and the third interface.

10. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 8.

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