Display panel, preparation method thereof and display device

Abstract

Embodiments of the present application provide a display panel, a preparation method thereof and a display device. The display panel comprises: a substrate; a light-emitting layer arranged on one side of the substrate; and a polarization gain layer arranged on a side of the light-emitting layer away from the substrate; wherein: the polarization gain layer comprises one layer or a plurality of layers of optical gain layers arranged in sequence in a direction away from the substrate, at least one layer of the optical gain layers has a patterned region, and corresponding to the patterned region, the optical gain layer comprises a first gain body and at least one protruding structure, the protruding structure is arranged on a side of the first gain body away from the substrate, and the orthographic projection of the at least one protruding structure on the substrate is symmetrically distributed along a peeling direction. Embodiments of the present application can improve the light-emitting efficiency.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] OLED (Organic Light Emitting Diode) display technology features high color gamut, high contrast, flexible self-emissiveness, and low power consumption, making it one of the mainstream information display technologies currently used in smart display ports. The future development direction of OLED display technology is towards higher luminous efficiency and lower energy consumption. Summary of the Invention

[0003] This application addresses the shortcomings of existing methods by proposing a display panel, its fabrication method, and a display device that can improve luminous efficiency.

[0004] In a first aspect, embodiments of this application provide a display panel, including:

[0005] Substrate;

[0006] A light-emitting layer is disposed on one side of the substrate;

[0007] A polarization gain layer is disposed on the side of the light-emitting layer away from the substrate; wherein:

[0008] The polarization gain layer includes one or multiple optical gain layers arranged sequentially along the direction away from the substrate. At least one optical gain layer has a patterned region. Corresponding to the patterned region, the optical gain layer includes a first gain body and at least one protrusion structure. The protrusion structure is disposed on the side of the first gain body away from the substrate. The orthogonal projection of the at least one protrusion structure on the substrate is symmetrically distributed along the peeling direction.

[0009] Optionally, at least one optical gain layer further has a continuous region. Corresponding to the continuous region, the optical gain layer includes a second gain body, which is connected to the first gain body. The orthographic projection of the second gain body on the substrate is symmetrically distributed along the peeling direction.

[0010] The surface of the second gain body facing away from the substrate is flush with the surface of the first gain body facing away from the substrate; or, the surface of the second gain body facing away from the substrate protrudes towards the side away from the substrate relative to the surface of the first gain body facing away from the substrate.

[0011] Optionally, along the direction perpendicular to the substrate, the height of the protrusion structure is greater than or equal to 1 μm and less than or equal to 5 μm; and / or,

[0012] The thickness of the second gain body is greater than or equal to 4 μm and less than or equal to 6 μm.

[0013] Optionally, in a section perpendicular to the substrate, the cross-sectional shape of the protrusion structure is semi-circular, rectangular, square, semi-elliptical, or trapezoidal; and / or,

[0014] The number of protrusions is multiple, and the multiple protrusions are spaced apart. In the direction parallel to the substrate, the distance between two adjacent protrusions is greater than or equal to 10 μm and less than or equal to 50 μm.

[0015] Optionally, the polarization gain layer includes multiple optical gain layers, with adjacent optical gain layers directly connected or connected through a first optical bonding layer; and / or,

[0016] The material of the optical gain layer is cholesteric liquid crystal.

[0017] Optionally, the display panel also includes an encapsulation layer disposed between the light-emitting layer and the polarization gain layer;

[0018] The polarization gain layer also includes a quarter-wave plate and a polarizing layer. The quarter-wave plate is disposed on the side of at least one optical gain layer away from the substrate, and the polarizing layer is disposed on the side of the quarter-wave plate away from the substrate.

[0019] Optionally, the display panel further includes a pixel definition layer and a light-shielding layer. The pixel definition layer is disposed on one side of the substrate and includes a dam and a first opening. The first opening is located between two adjacent dams, and a portion of the structure of the light-emitting layer is disposed within the first opening. The light-shielding layer is disposed on the side of the encapsulation layer away from the substrate and includes a black matrix and a second opening. The second opening is located between two adjacent black matrices, and the orthographic projection of the black matrix on the substrate is located within the orthographic projection of the dam on the substrate.

[0020] The light-shielding layer is located between the encapsulation layer and the optical gain layer, and the black matrix is ​​connected to the optical gain layer through a second optical bonding layer; or,

[0021] The light-shielding layer is located between the optical gain layer and the quarter-wave plate, and the black matrix is ​​connected to the quarter-wave plate through a second optical bonding layer; or,

[0022] The light-shielding layer is located between the quarter-wave plate and the polarizing layer, and the black matrix is ​​connected to the polarizing layer through a second optical bonding layer; or,

[0023] The light-shielding layer is located on the side of the polarizing layer away from the substrate.

[0024] Optionally, the optical gain layer is configured to reflect and transmit light in a preset wavelength band, which includes a red light band, a green light band, or a blue light band; the wavelength range of the preset wavelength band is greater than or equal to 400 nm and less than or equal to 800 nm.

[0025] At least one optical gain layer reflects light in at least one of the three bands: red, green, and blue, with a reflectivity greater than 45%.

[0026] At least one optical gain layer has a transmittance of more than 95% for light in the preset wavelength band, excluding the red, green and blue wavelength bands.

[0027] Secondly, embodiments of this application provide a display device, including the aforementioned display panel.

[0028] Thirdly, embodiments of this application provide a method for manufacturing a display panel, comprising:

[0029] Provide a substrate;

[0030] A light-emitting layer is fabricated on one side of the substrate;

[0031] A polarization gain layer is fabricated on the side of the light-emitting layer away from the substrate, wherein: the polarization gain layer includes one or multiple optical gain layers arranged sequentially along the direction away from the substrate, at least one optical gain layer has a patterned region, corresponding to the patterned region, the optical gain layer includes a first gain body and at least one protrusion structure, the protrusion structure is disposed on the side of the first gain body away from the substrate, and the orthogonal projection of at least one protrusion structure on the substrate is symmetrically distributed along the peeling direction.

[0032] The beneficial technical effects of the technical solutions provided in this application include:

[0033] In this embodiment, the polarization gain layer includes multiple optical gain layers sequentially disposed along the direction away from the substrate. These optical gain layers enable optical gain, and by disposing of multiple optical gain layers, optical gain efficiency and luminous efficiency can be improved. At least one optical gain layer has a patterned region. Corresponding to the patterned region, the optical gain layer includes a first gain body and at least one protrusion structure. The protrusion structure is disposed on the side of the first gain body away from the substrate. By disposing of the patterned region and the corresponding first gain body and at least one protrusion structure, the bonding force between the optical gain layer with the patterned region and adjacent optical gain layers can be improved, making the connection between the two optical gain layers more robust and reliable. The protrusion structure or the vacancy located on the outer periphery of the protrusion structure can block the stress acting on the optical gain layer, reducing stress concentration, thereby preventing crack growth and effectively suppressing further defect propagation.

[0034] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0035] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0036] Figure 1 This is a schematic diagram of the film layer structure of a display panel provided in an embodiment of this application;

[0037] Figure 2 A schematic diagram of the film structure of an optical gain layer and a first optical bonding layer of a display panel provided in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the structure of an optical gain layer for a display panel provided in an embodiment of this application;

[0039] Figure 4 A schematic diagram of the structure of an optical gain layer of another display panel provided in an embodiment of this application;

[0040] Figure 5 for Figure 3 A top view of an optical gain layer for a display panel;

[0041] Figure 6 A morphological diagram of a portion of the film layer of a display panel provided in an embodiment of this application;

[0042] Figure 7 This is a flowchart illustrating a method for manufacturing a display panel according to an embodiment of this application.

[0043] Figure label:

[0044] 100-Display panel; 10-Substrate; 20-Emitting layer; 21-First electrode; 22-Emitting functional layer; 23-Second electrode; 30-Polarization gain layer; 31-Optical gain layer; 311-First optical gain layer; 312-Second optical gain layer; 313-Third optical gain layer; 32-Patterned area; 33-First gain body; 34-Protrusion structure; 35-Continuous area; 36-Second gain body; 37-First optical bonding layer; 38-Quarter-wave plate; 39-Polarizing layer; 40-Encapsulation layer; 50-Pixel definition layer; 51-Dam; 52-First opening; 60-Light shielding layer; 61-Black matrix; 62-Second opening; 63-Second optical bonding layer; 70-Pixel circuit layer; 80-Planing layer. Detailed Implementation

[0045] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0046] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude implementations of other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by this art. It should be understood that when we say an element is “connected” or “coupled” to another element, the element may be directly connected or coupled to the other element, or it may mean that the element and the other element are connected through an intermediate element. Furthermore, “connected” or “coupled” as used herein may include wireless connection or wireless coupling. The term “and / or” as used herein means at least one of the items defined by the term; for example, “A and / or B” may be implemented as “A,” or as “B,” or as “A and B.”

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0048] First, let me introduce and explain the terms used in this application:

[0049] Cholesteric liquid crystals (CLCs) are named for their origin as cholesterol derivatives. These liquid crystal molecules are flattened and arranged in layers, with molecules within each layer parallel to each other. The long axis of the molecules is parallel to the layer plane, with slight variations in the direction of the long axis between different layers, forming a helical structure along the normal direction of the layer. The pitch of a Cholesteric liquid crystal is approximately 300 nm, on the same order of magnitude as the wavelength of visible light. This pitch changes with external temperature and electric field conditions, allowing modulation of external light by adjusting the pitch. These liquid crystals are generally lipid compounds formed by reacting cholesterol as the main raw material with certain organic acids (such as oleic acid, benzoic acid, and nonanoic acid). They exhibit a strong temperature effect, selectively reflecting light with temperature changes. This is because the pitch of the liquid crystal is highly sensitive to temperature; when the pitch matches the wavelength of light, strong selective reflection occurs.

[0050] The relevant technologies are explained below:

[0051] One of the mainstream methods to improve the luminous efficiency and reduce power consumption of OLED display technology is to apply optical gain film materials to OLED display devices to improve the light emission efficiency of OLED display devices. Cholesteric liquid crystal film (hereinafter referred to as CLC) with circular polarization characteristics is a very promising optical gain technology.

[0052] CLC technology is a promising optical gain technology that can significantly improve the luminous efficiency of display devices through optical gain. The material system of CLC technology is relatively mature and compatible with the current OLED mass production structure, showing high application potential. The improved optical properties brought by CLC can alleviate the pressure of OLED light-emitting material iteration, which can not only further give full play to the performance of existing mass-produced organic light-emitting materials, but also appropriately relax the screening threshold of organic light-emitting materials.

[0053] However, CLC films are difficult to characterize for their adhesion defects due to their texture (the characterization process is prone to secondary damage and in-situ characterization is not easy), and some defect structures and stress concentration areas are not easily distinguished. As a result, defects can propagate and adhesion can fail during use. Furthermore, currently, mature CLC film processing technologies can achieve optical gain for a single wavelength band, such as red, blue, or green light, but the gain efficiency and luminous efficiency are relatively low.

[0054] The display panel, its manufacturing method, and the display device provided in this application are intended to solve at least one of the above-mentioned technical problems in the prior art.

[0055] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.

[0056] This application provides a display panel, the structural schematic diagram of which is shown below. Figures 1 to 6 As shown, the display panel 100 includes: a substrate 10, a light-emitting layer 20, and a polarization gain layer 30. The light-emitting layer 20 is disposed on one side of the substrate 10; the polarization gain layer 30 is disposed on the side of the light-emitting layer 20 away from the substrate 10; wherein: the polarization gain layer 30 includes multiple optical gain layers 31 arranged sequentially along the direction away from the substrate 10, at least one optical gain layer 31 has a patterned region 32, corresponding to the patterned region 32, the optical gain layer 31 includes a first gain body 33 and at least one protrusion structure 34, the protrusion structure 34 is disposed on the side of the first gain body 33 away from the substrate 10, and the orthogonal projection of at least one protrusion structure 34 on the substrate 10 is symmetrically distributed along the peeling direction L.

[0057] In this embodiment, the light-emitting layer 20 and the polarization gain layer 30 are sequentially disposed on one side of the substrate 10, and the substrate 10 provides support for the light-emitting layer 20 and the polarization gain layer 30. The polarization gain layer 30 includes multiple optical gain layers 31 sequentially disposed along the direction away from the substrate 10. The optical gain layers 31 can achieve optical gain. By disposing of multiple optical gain layers 31, the optical gain efficiency and luminous efficiency can be improved. At least one optical gain layer 31 has a patterned region 32. Corresponding to the patterned region 32, the optical gain layer 31 includes a first gain body 33 and at least one protrusion structure 34. The protrusion structure 34 is disposed on the side of the first gain body 33 away from the substrate 10. By disposing of the patterned region 32 and the first gain body 33 and at least one protrusion structure 34 corresponding to the patterned region 32, the bonding force between the optical gain layer 31 with the patterned region 32 and the adjacent optical gain layer 31 can be improved, making the connection between the two optical gain layers 31 more robust and reliable. The protruding structure 34 or the vacancy located on the outer periphery of the protruding structure 34 can block the stress acting on the optical gain layer 31, reduce stress concentration, thereby preventing crack growth and effectively suppressing the further expansion of defects.

[0058] In this embodiment, by patterning the optical gain layer 31, stress concentration in the optical gain layer 31 can be reduced when defects occur, effectively suppressing the further propagation of defects (such as cracks). This reduces the risk of delamination between adjacent optical gain layers 31 or between the optical gain layer 31 and other film layers (such as the encapsulation layer 40 or the quarter-wave plate 38) after mechanical damage to the optical gain layer 31, and also reduces the risk of delamination between adjacent optical gain layers 31 of the polarization gain layer 30 after high-temperature treatment. Furthermore, the patterning design of the optical gain layer 31 also provides scattering characteristics, which is beneficial for enhancing the angular visibility of display devices with the optical gain layer 31.

[0059] In this embodiment, at least one protrusion 34 is symmetrically distributed along the peeling direction L on the substrate 10 by its orthogonal projection. Figure 5As shown, taking a rectangular optical gain layer 31 as an example, the patterned area 32 is approximately symmetrically distributed along the diagonal of the rectangular plane. The principle behind this design is that in industrial processing, an outer protective film needs to be attached to the optical gain layer. When the optical gain layer needs to be attached to the display device, the outer protective film needs to be removed before attaching it to the display device. When the outer protective film is removed along one corner, the shear stress extension line speed is faster and the cutting rate is higher along the outer side of the rectangle, resulting in a higher stress distribution and making it easier for "delamination" to occur. On the other hand, the shear stress extension line speed is slower and the cutting rate is lower, resulting in a lower stress distribution and making it easier for "residual adhesive" of the outer protective film to occur. Therefore, the patterned area 32 is set to be approximately symmetrically distributed along the diagonal of the rectangular plane, that is, at least one protrusion structure 34 is set to be symmetrically distributed along the peeling direction L on the orthogonal projection of the substrate 10. Through patterned design, the probability of defect generation and adhesion failure can be effectively reduced.

[0060] It should be noted that, in this embodiment, the peeling direction L refers to the direction in which the outer protective film attached to the optical gain layer 31 is peeled off from the optical gain layer 31. Specifically, as shown... Figure 5 As shown, when the orthogonal projection of the optical gain layer 31 onto the substrate 10 is rectangular, the peeling direction L can be the diagonal of the rectangular optical gain layer 31 (peeling along the diagonal is more labor-saving and convenient). Of course, depending on the actual situation, the peeling direction L can also be other directions, such as the transverse center line or the longitudinal center line of the rectangular optical gain layer 31.

[0061] Optionally, such as Figure 3 and Figure 5 As shown in the embodiment of this application, at least one optical gain layer 31 further has a continuous region 35. Corresponding to the continuous region 35, the optical gain layer 31 includes a second gain body 36, which is connected to the first gain body 33. The orthogonal projection of the second gain body 36 on the substrate 10 is symmetrically distributed along the peeling direction L. The surface of the second gain body 36 facing away from the substrate 10 is flush with the surface of the first gain body 33 facing away from the substrate 10.

[0062] In this embodiment, at least one optical gain layer 31 further has a continuous region 35. Corresponding to the continuous region 35, the optical gain layer 31 includes a second gain body 36, which is connected to the first gain body 33. By providing the continuous region 35 and the second gain body 36, the uniformity and stability of the optical and mechanical properties of the optical gain layer 31 can be improved. The orthographic projection of the second gain body 36 on the substrate 10 is symmetrically distributed along the peeling direction L, which can effectively reduce the probability of defect generation and bonding failure.

[0063] Of course, in some optional embodiments of this application, the surface of the second gain body 36 facing away from the substrate 10 can be made to protrude toward the side away from the substrate 10 relative to the surface of the first gain body 33 facing away from the substrate 10, as needed (e.g. Figure 4 (as shown); or, the polarization gain layer 30 may include an optical gain layer 31 having a patterned region 32; or the polarization gain layer 30 may include multiple optical gain layers 31, and depending on actual needs, all multiple optical gain layers 31 may have only continuous regions 35 and no patterned regions 32.

[0064] Optionally, such as Figure 3 As shown in the embodiment of this application, along the direction perpendicular to the substrate 10, the height h1 of the protrusion structure 34 is greater than or equal to 1 μm and less than or equal to 5 μm.

[0065] If the height h1 of the protrusion structure 34 is less than 1 μm, the height of the protrusion structure 34 is too small, which will reduce the improvement of optical gain effect and the bonding force between the two adjacent optical gain layers 31, and make the processing more difficult; if the height h1 of the protrusion structure 34 is greater than 5 μm, the height of the protrusion structure 34 is too large, which will cause waste of materials and resources, and the increase in the improvement of optical gain effect and the bonding force between the two adjacent optical gain layers 31 will be limited.

[0066] In this embodiment, the height h1 of the protrusion structure 34 is set to be greater than or equal to 1 μm and less than or equal to 5 μm. This not only effectively improves the optical gain effect and the bonding force between two adjacent optical gain layers 31, but also makes it easier to process, saves materials and resources, avoids waste, and reduces production costs.

[0067] Optionally, such as Figure 3 As shown in the embodiment of this application, along the direction perpendicular to the substrate 10, the thickness h2 of the second gain body 36 is greater than or equal to 4 μm and less than or equal to 6 μm.

[0068] If the thickness h2 of the second gain body 36 is less than 4 μm, the improvement in optical gain will be reduced and the processing will be more difficult; if the thickness h2 of the second gain body 36 is greater than 6 μm, it will result in a waste of materials and resources and the increase in the improvement in optical gain will be limited.

[0069] In this embodiment, the thickness h2 of the second gain body 36 is set to be greater than or equal to 4 μm and less than or equal to 6 μm. This not only effectively improves the optical gain effect, but also makes it easy to process, saves materials and resources, avoids waste, and reduces production costs.

[0070] Optionally, such as Figure 3As shown in the embodiments of this application, the cross-sectional shape of the protrusion structure 34 on the cross-section perpendicular to the substrate 10 is semi-circular, rectangular, square, semi-elliptical, or trapezoidal.

[0071] Optionally, such as Figure 3 As shown in the embodiment of this application, there are multiple protrusion structures 34, which are spaced apart. In the direction parallel to the substrate 10, the distance between two adjacent protrusion structures 34 is greater than or equal to 10 μm and less than or equal to 50 μm.

[0072] In this embodiment, multiple protrusions 34 are spaced apart to avoid mutual interference, effectively improving the bonding force between the optical gain layer 31 with the patterned area 32 and the adjacent optical gain layer 31, making the connection between the two optical gain layers 31 more robust and reliable. The protrusions 34 or the vacancy located on the outer periphery of the protrusions 34 can block the stress acting on the optical gain layer 31, reduce stress concentration, thereby preventing crack growth and effectively suppressing further expansion of defects.

[0073] If the distance between two adjacent protrusions 34 is less than 10 μm, the density of the protrusions 34 is relatively high, the processing difficulty increases, and the effect on reducing the probability of defect generation and bonding failure will be reduced; if the distance between two adjacent protrusions 34 is greater than 50 μm, the density of the protrusions 34 is relatively low, and the degree of improvement in the bonding force between two adjacent optical gain layers 31 will be reduced.

[0074] In this embodiment, the distance between two adjacent protrusions 34 is set to be greater than or equal to 10 μm and less than or equal to 50 μm, which makes it easy to process, effectively reduces the probability of defect generation and bonding failure, and improves the bonding force between two adjacent optical gain layers 31.

[0075] Optionally, such as Figure 2 As shown in the embodiment of this application, the polarization gain layer 30 includes multiple optical gain layers 31, and adjacent optical gain layers 31 are connected by a first optical bonding layer 37. The first optical bonding layer 37 bonds the adjacent optical gain layers 31 together.

[0076] Of course, in an optional embodiment of this application, adjacent optical gain layers 31 can be directly connected according to actual needs. Optionally, another optical gain layer 31 can be directly fabricated on an optical gain layer 31 near the substrate 10, so that adjacent optical gain layers 31 are directly connected.

[0077] Optionally, in this embodiment, the material of the optical gain layer 31 is cholesteric liquid crystal. Optionally, the material of the optical gain layer 31 is a polymer-stabilized cholesteric liquid crystal material (PSCT).

[0078] Optionally, in this embodiment, the material of the first optical bonding layer 37 is optical adhesive. The liquid optical adhesive adapts to the patterned design of the optical gain layer 31, and can fill the vacancies located on the outer periphery of the protruding structure 34, effectively bonding adjacent optical gain layers 31 together.

[0079] Optionally, in this embodiment, the optical gain layer 31 is configured to reflect and transmit light in a preset wavelength band, which includes a red light band, a green light band, or a blue light band; the wavelength range of the preset wavelength band is greater than or equal to 400 nm and less than or equal to 800 nm; at least one optical gain layer 31 reflects light in at least one of the three wavelength bands (red, green, and blue) with a reflectivity greater than 45%; at least one optical gain layer 31 has a transmittance of greater than 95% for light in the preset wavelength bands other than the red, green, and blue light bands.

[0080] In one optional embodiment of this application, the wavelength range of the red light band is greater than or equal to 650 nm and less than or equal to 720 nm; the wavelength range of the green light band is greater than or equal to 500 nm and less than or equal to 600 nm; and the wavelength range of the blue light band is greater than or equal to 430 nm and less than or equal to 480 nm.

[0081] Optionally, as shown in Figure 2, in this embodiment of the application, the polarization gain layer 30 includes a first optical gain layer 311, a second optical gain layer 312, and a third optical gain layer 313 sequentially disposed along the direction away from the substrate 10. The first optical gain layer 311, the second optical gain layer 312, and the third optical gain layer 313 can provide optical gain for any one of the red, green, or blue light bands. Optionally, the first optical gain layer 311, the second optical gain layer 312, and the third optical gain layer 313 provide optical gain for light in different light bands. Optionally, the first optical gain layer 311 is configured to reflect light in the red light band, the second optical gain layer 312 is configured to reflect light in the blue light band, and the third optical gain layer 313 is configured to reflect light in the green light band.

[0082] Optionally, based on the characteristics of cholesteric liquid crystals, the pitch of the cholesteric liquid crystal changes with different external temperature and electric field conditions, and the external light can be modulated by adjusting the pitch. When the pitch matches the wavelength of the light, strong selective reflection occurs. That is, optionally, by adjusting the external temperature and electric field conditions, the pitch of the cholesteric liquid crystal material in the first optical gain layer 311 can be made to match the wavelength of red light to emit red light; the pitch of the cholesteric liquid crystal material in the second optical gain layer 312 can be made to match the wavelength of blue light to reflect blue light; and the pitch of the cholesteric liquid crystal material in the third optical gain layer 313 can be made to match the wavelength of green light to reflect green light. It should be noted that the technique of reflecting any of the red, blue, and green light bands through an optical gain layer made of cholesteric liquid crystal material is similar to existing technology and will not be described in detail here.

[0083] Optionally, as shown in Figure 2, in this embodiment of the application, the first optical gain layer 311 and the second optical gain layer 312 are bonded together by the first optical bonding layer 37, and the second optical gain layer 312 and the third optical gain layer 313 are bonded together by the first optical bonding layer 37. Specifically, the first optical gain layer 311, the first optical bonding layer 37, the second optical gain layer 312, the first optical bonding layer 37, and the third optical gain layer 313 are arranged sequentially from bottom to top.

[0084] In this embodiment, the first optical gain layer 311 is configured to optically gain light in the red light band, the second optical gain layer 312 is configured to optically gain light in the blue light band, and the third optical gain layer 313 is configured to optically gain light in the green light band. The first optical gain layer 311, the second optical gain layer 312, and the third optical gain layer 313 form a CLC composite film, enabling simultaneous optical gain for the red, green, and blue primary colors of the display panel. Display devices equipped with CLC composite films in the red, green, and blue primary color bands can achieve a white light extraction efficiency of approximately 30%. Optionally, the CLC composite film can generally be processed using a roll-to-roll process, where the CLC composite film is prepared by bonding optical adhesive materials to the CLC film.

[0085] Optionally, such as Figure 1 As shown, the display panel 100 of this application embodiment further includes a pixel definition layer 50. The pixel definition layer 50 is disposed on one side of the substrate 10. The pixel definition layer 50 includes a dam 51 and a first opening 52. The first opening 52 is located between two adjacent dams 51. A portion of the structure of the light-emitting layer 20 is disposed within the first opening 52.

[0086] Optionally, such as Figure 1As shown in the embodiment of this application, the light-emitting layer 20 includes a first electrode 21, a light-emitting functional layer 22, and a second electrode 23. The first electrode 21 is disposed in the first opening 52, and the light-emitting functional layer 22 and the second electrode 23 are disposed sequentially on the side of the pixel definition layer 50 away from the substrate 10, and cover the dam 51 and the first electrode 21.

[0087] Optionally, in this embodiment, the first electrode 21 can be an anode, and the second electrode 23 can be a cathode. The light-emitting functional layer 22 includes an electron injection layer, an electron transport layer, a hole blocking layer, an electron blocking layer, a hole injection layer, and a hole transport layer.

[0088] Optionally, such as Figure 1 As shown, the display panel 100 of this application embodiment further includes an encapsulation layer 40, which is disposed between the light-emitting layer 20 and the polarization gain layer 30; the polarization gain layer 30 further includes a quarter-wave plate 38 and a polarizing layer 39, the quarter-wave plate 38 is disposed on the side of at least one optical gain layer 31 away from the substrate 10, and the polarizing layer 39 is disposed on the side of the quarter-wave plate 38 away from the substrate 10.

[0089] In this embodiment, the encapsulation layer 40 encapsulates and protects the light-emitting layer 20, preventing moisture from entering the light-emitting layer 20 and affecting the display effect. The quarter-wave plate 38, the polarizing layer 39, and the optical gain layer 31 form a circular polarization gain film, which can achieve optical gain, realize the reflection and transmission of light within a preset wavelength band, and improve luminous efficiency.

[0090] Optionally, in this embodiment of the application, the encapsulation layer 40 includes a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer sequentially disposed along the direction away from the substrate 10, and the thickness of the first inorganic encapsulation layer and / or the second inorganic encapsulation layer is greater than or equal to 0.5 μm and less than or equal to 2 μm along the direction perpendicular to the substrate 10.

[0091] Optionally, in this embodiment of the application, the thickness of the first inorganic encapsulation layer is 1.0 μm, and the thickness of the second inorganic encapsulation layer is 0.7 μm.

[0092] Optionally, such as Figure 1 As shown, the display panel 100 of this application embodiment also includes a light-shielding layer 60. The light-shielding layer 60 is disposed on the side of the encapsulation layer 40 away from the substrate 10. The light-shielding layer 60 includes a black matrix 61 and a second opening 62. The second opening 62 is located between two adjacent black matrices 61. The orthographic projection of the black matrix 61 on the substrate 10 is located within the orthographic projection of the dam 51 on the substrate 10.

[0093] In this embodiment, the black matrix 61 serves to block light. The orthographic projection of the black matrix 61 on the substrate 10 is located within the orthographic projection of the dam 51 on the substrate 10. The second opening 62 is located between two adjacent black matrices 61, and the first opening 52 is located between two adjacent dams 51. This allows light emitted from the light-emitting layer 20, whose structure is located within the first opening 52, to pass through the second opening 62 and achieve normal display function.

[0094] In one optional embodiment of this application, such as Figure 1 As shown, the light-shielding layer 60 is located between the encapsulation layer 40 and the optical gain layer 31, and the black matrix 61 is connected to the optical gain layer 31 through the second optical bonding layer 63.

[0095] In this embodiment of the application, the black matrix 61 and the optical gain layer 31 are bonded together by the second optical bonding layer 63.

[0096] Optionally, such as Figure 1 As shown in the embodiment of this application, the second optical bonding layer 63 fills the second opening 62.

[0097] Of course, in another optional embodiment of this application, the light-shielding layer 60 can be located between the optical gain layer 31 and the quarter-wave plate 38, and the black matrix 61 can be connected to the quarter-wave plate 38 through the second optical bonding layer 63, depending on actual needs; or, the light-shielding layer 60 can be located between the quarter-wave plate 38 and the polarizing layer 39, and the black matrix 61 can be connected to the polarizing layer 39 through the second optical bonding layer 63; or, the light-shielding layer 60 can be located on the side of the polarizing layer 39 away from the substrate 10.

[0098] Optionally, in this embodiment, the material of the second optical bonding layer 63 is optical adhesive.

[0099] Optionally, in this embodiment of the application, the substrate 10 includes a first substrate layer, a first barrier layer, a second substrate layer, a second barrier layer and a buffer layer disposed sequentially. Along the direction perpendicular to the substrate 10, the thickness of the first barrier layer and / or the second barrier layer is greater than or equal to 5000 angstroms and less than or equal to 6000 angstroms, and the thickness of the buffer layer is greater than or equal to 3500 angstroms and less than or equal to 4500 angstroms.

[0100] Optionally, in this embodiment, the substrate 10 is a flexible substrate, the first substrate layer is a flexible substrate layer, and the second substrate layer is a flexible substrate layer. Optionally, the material of the flexible substrate layer may include one or more of PI (polyimide), PET (polyethylene terephthalate), and PC (polycarbonate). Specifically, from bottom to top, the layers are a first flexible substrate layer, a first barrier layer, a second flexible substrate layer, a second barrier layer, and a buffer layer. Optionally, the thickness of the first barrier layer and / or the second barrier layer is 5500 angstroms, and the thickness of the buffer layer is 4000 angstroms.

[0101] Of course, in some optional embodiments of this application, the substrate 10 may consist of only a flexible substrate layer, depending on actual needs.

[0102] Optionally, such as Figure 1 As shown in the embodiment of this application, the display panel 100 further includes a pixel circuit layer 70 and a planarization layer 80. The pixel circuit layer 70 is disposed on the side of the buffer layer away from the first substrate layer. The pixel circuit layer 70 includes a thin-film transistor and a capacitor. The thin-film transistor includes an active layer, a gate electrode, a source electrode, and a drain electrode. The capacitor includes a first electrode plate and a second electrode plate. The planarization layer 80 is disposed on the side of the pixel circuit layer 70 away from the substrate 10 to improve the planarization degree. The pixel definition layer 50 is located on the side of the planarization layer 80 away from the substrate 10.

[0103] It should be noted that in the embodiments of this application, the structure and arrangement of the substrate 10, pixel circuit layer 70, planarization layer 80, pixel definition layer 50, light-emitting layer 20, encapsulation layer 40, light-shielding layer 60, quarter-wave plate 38 and polarizing layer 39 are similar to those of the prior art, and will not be described again here.

[0104] In this embodiment, the display panel is a display device with a circular polarization gain film.

[0105] This application provides a design scheme to enhance the reliability and processing characteristics of circularly polarized gain films. By patterning the layers of the circularly polarized gain film, stress concentration in the film is reduced when defects occur, effectively suppressing further defect propagation, lowering the risk of delamination between film layers after mechanical damage, and reducing the risk of delamination after high-temperature processing. Furthermore, the patterned design of the film layers also provides scattering properties, which is beneficial for enhancing the angular visibility of display devices equipped with circularly polarized gain films.

[0106] The display panel of this application embodiment can be applied to the field of OLED display, especially to the field related to EL device structure.

[0107] Based on the same inventive concept, this application provides a method for manufacturing a display panel, the flowchart of which is shown below. Figure 7 As shown, the method includes:

[0108] S101, Provide a substrate 10;

[0109] S102. A light-emitting layer 20 is fabricated on one side of the substrate 10;

[0110] S103. A polarization gain layer 30 is formed on the side of the light-emitting layer 20 away from the substrate 10, wherein: the polarization gain layer 30 includes one or multiple optical gain layers 31 arranged sequentially along the direction away from the substrate 10, at least one optical gain layer 31 has a patterned region 32, corresponding to the patterned region 32, the optical gain layer 31 includes a first gain body 33 and at least one protrusion structure 34, the protrusion structure 34 is disposed on the side of the first gain body 33 away from the substrate 10, and the orthogonal projection of at least one protrusion structure 34 on the substrate 10 is symmetrically distributed along the peeling direction L.

[0111] In this embodiment, the display panel is prepared using the method described above. Optionally, the display panel in this embodiment can be prepared using the same method described in this embodiment.

[0112] In this embodiment, the light-emitting layer 20 and the polarization gain layer 30 are sequentially disposed on one side of the substrate 10, and the substrate 10 provides support for the light-emitting layer 20 and the polarization gain layer 30. The polarization gain layer 30 includes one or multiple optical gain layers 31 sequentially disposed along the direction away from the substrate 10. The optical gain layer 31 can achieve optical gain. By disposing of multiple optical gain layers 31, the optical gain efficiency and luminous efficiency can be improved. At least one optical gain layer 31 has a patterned region 32. Corresponding to the patterned region 32, the optical gain layer 31 includes a first gain body 33 and at least one protrusion structure 34. The protrusion structure 34 is disposed on the side of the first gain body 33 away from the substrate 10. By disposing of the patterned region 32 and the first gain body 33 and at least one protrusion structure 34 corresponding to the patterned region 32, the bonding force between the optical gain layer 31 with the patterned region 32 and the adjacent optical gain layer 31 can be improved, making the connection between the two optical gain layers 31 more robust and reliable. The protruding structure 34 or the vacancy located on the outer periphery of the protruding structure 34 can block the stress acting on the optical gain layer 31, reduce stress concentration, thereby preventing crack growth and effectively suppressing the further expansion of defects.

[0113] In this embodiment, by patterning the optical gain layer 31, stress concentration in the optical gain layer 31 can be reduced when defects occur, effectively suppressing the further propagation of defects (such as cracks). This reduces the risk of delamination between adjacent optical gain layers 31 or between the optical gain layer 31 and other film layers (such as the encapsulation layer 40 or the quarter-wave plate 38) after mechanical damage to the optical gain layer 31, and also reduces the risk of delamination between adjacent optical gain layers 31 of the polarization gain layer 30 after high-temperature treatment. Furthermore, the patterning design of the optical gain layer 31 also provides scattering characteristics, which is beneficial for enhancing the angular visibility of display devices with the optical gain layer 31.

[0114] It should be noted that, in the embodiments of this application, the structure of each film layer of the display panel can be patterned by a patterning process to produce each corresponding film layer.

[0115] It should be noted that the above patterning process includes the coating, exposure, development, etching of photoresist, and the removal of part or all of the photoresist.

[0116] Based on the same inventive concept, this application provides a display device, which includes the above-described display panel 100.

[0117] Specifically, the display device can be any of the following: LCD (Liquid Crystal Display), OLED (Organic Light Emitting Diode), Micro LED (Micro Light Emitting Diode), or Mini LED (Mini Light Emitting Diode). The display device can also be any product or component with display function, such as a monitor, television, digital camera, mobile phone, tablet computer, laptop computer, or navigator.

[0118] It should be noted that since the display device of this application embodiment includes the display panel of this application embodiment, the display device of this application embodiment also has the above-mentioned beneficial effects of the display panel of this application embodiment, which will not be repeated here.

[0119] By applying the embodiments of this application, at least the following beneficial effects can be achieved:

[0120] In this embodiment, the light-emitting layer and the polarization gain layer are sequentially disposed on one side of the substrate, with the substrate providing support for both. The polarization gain layer comprises multiple optical gain layers sequentially disposed along the direction away from the substrate. These optical gain layers enable optical gain, and by providing multiple layers, both optical gain efficiency and luminous efficiency can be improved. At least one optical gain layer has a patterned region. Corresponding to the patterned region, the optical gain layer includes a first gain body and at least one protrusion structure. The protrusion structure is disposed on the side of the first gain body away from the substrate. By providing the patterned region and the corresponding first gain body and at least one protrusion structure, the bonding force between the patterned optical gain layer and adjacent optical gain layers can be improved, making the connection between the two optical gain layers more robust and reliable. The protrusion structure or the vacancy located on the outer periphery of the protrusion structure can block the stress acting on the optical gain layer, reducing stress concentration and thus preventing crack growth and effectively suppressing further defect propagation.

[0121] In this embodiment, by patterning the optical gain layer, stress concentration in the optical gain layer can be reduced when defects occur, effectively suppressing further defect propagation. This reduces the risk of delamination between adjacent optical gain layers or between the optical gain layer and other film layers after mechanical damage, and also reduces the risk of delamination between adjacent optical gain layers of the polarization gain layer after high-temperature processing. Furthermore, patterning the optical gain layer also provides scattering properties, which helps enhance the angular visibility of display devices with optical gain layers.

[0122] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0123] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate directions or positional relationships based on the exemplary directions or positional relationships shown in the accompanying drawings. They are used to facilitate the description or simplification of the embodiments of this application and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0124] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0125] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0126] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0127] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown sequentially according to the arrows, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of this application, the steps in each process can be executed in other orders as required. Moreover, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages may be executed at the same time or at different times. In scenarios where the execution times are different, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and this application does not limit this.

[0128] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. A display panel, characterized in that, include: Substrate; A light-emitting layer is disposed on one side of the substrate; A polarization gain layer is disposed on the side of the light-emitting layer away from the substrate; wherein: The polarization gain layer includes one or multiple optical gain layers arranged sequentially along the direction away from the substrate. At least one optical gain layer has a patterned region. Corresponding to the patterned region, the optical gain layer includes a first gain body and at least one protrusion structure. The protrusion structure is disposed on the side of the first gain body away from the substrate. The orthogonal projection of the at least one protrusion structure on the substrate is symmetrically distributed along the peeling direction. At least one of the optical gain layers further has a continuous region. Corresponding to the continuous region, the optical gain layer includes a second gain body, which is connected to the first gain body. The orthographic projection of the second gain body on the substrate is symmetrically distributed along the peeling direction. The surface of the second gain body facing away from the substrate is flush with the surface of the first gain body facing away from the substrate; or, the surface of the second gain body facing away from the substrate protrudes toward the side away from the substrate relative to the surface of the first gain body facing away from the substrate.

2. The display panel according to claim 1, characterized in that, Along the direction perpendicular to the substrate, The height of the protrusion structure is greater than or equal to 1 μm and less than or equal to 5 μm; and / or, The thickness of the second gain body is greater than or equal to 4 μm and less than or equal to 6 μm.

3. The display panel according to claim 1, characterized in that, In a cross-section perpendicular to the substrate, the cross-sectional shape of the protrusion structure is semi-circular, rectangular, square, semi-elliptical, or trapezoidal; and / or, The number of protrusions is multiple, and the multiple protrusions are spaced apart. In the direction parallel to the substrate, the distance between two adjacent protrusions is greater than or equal to 10 μm and less than or equal to 50 μm.

4. The display panel according to any one of claims 1 to 3, characterized in that, The polarization gain layer comprises multiple optical gain layers, with adjacent optical gain layers directly connected or connected through a first optical bonding layer; and / or The material of the optical gain layer is cholesteric liquid crystal.

5. The display panel according to any one of claims 1 to 3, characterized in that, It also includes an encapsulation layer disposed between the light-emitting layer and the polarization gain layer; The polarization gain layer further includes a quarter-wave plate and a polarizing layer, wherein the quarter-wave plate is disposed on the side of the at least one optical gain layer away from the substrate, and the polarizing layer is disposed on the side of the quarter-wave plate away from the substrate.

6. The display panel according to claim 5, characterized in that, It also includes a pixel definition layer and a light-shielding layer. The pixel definition layer is disposed on one side of the substrate. The pixel definition layer includes a dam and a first opening. The first opening is located between two adjacent dams. A portion of the structure of the light-emitting layer is disposed within the first opening. The light-shielding layer is disposed on the side of the encapsulation layer away from the substrate. The light-shielding layer includes a black matrix and a second opening. The second opening is located between two adjacent black matrices. The orthographic projection of the black matrix on the substrate is located within the orthographic projection of the dam on the substrate. The light-shielding layer is located between the encapsulation layer and the optical gain layer, and the black matrix is ​​connected to the optical gain layer through a second optical bonding layer; or, The light-shielding layer is located between the optical gain layer and the quarter-wave plate, and the black matrix is ​​connected to the quarter-wave plate through a second optical bonding layer; or, The light-shielding layer is located between the quarter-wave plate and the polarizing layer, and the black matrix is ​​connected to the polarizing layer through a second optical bonding layer; or... The light-shielding layer is located on the side of the polarizing layer away from the substrate.

7. The display panel according to any one of claims 1 to 3, characterized in that, The optical gain layer is configured to reflect and transmit light in a preset wavelength band, which includes a red light band, a green light band, or a blue light band; the wavelength range of the preset wavelength band is greater than or equal to 400 nm and less than or equal to 800 nm. The at least one optical gain layer reflects light in at least one of the three bands: red, green and blue, with a reflectivity greater than 45%. The transmittance of the at least one optical gain layer for light in the preset band other than the red, green and blue bands is greater than 95%.

8. A display device, characterized in that, include: The display panel according to any one of claims 1 to 7.

9. A method for manufacturing a display panel, characterized in that, include: Provide a substrate; A light-emitting layer is formed on one side of the substrate; A polarization gain layer is fabricated on the side of the light-emitting layer away from the substrate, wherein: the polarization gain layer includes one or multiple optical gain layers arranged sequentially along the direction away from the substrate, at least one of the optical gain layers has a patterned region, corresponding to the patterned region, the optical gain layer includes a first gain body and at least one protrusion structure, the protrusion structure is disposed on the side of the first gain body away from the substrate, and the orthogonal projection of the at least one protrusion structure on the substrate is symmetrically distributed along the peeling direction; At least one of the optical gain layers further has a continuous region. Corresponding to the continuous region, the optical gain layer includes a second gain body, which is connected to the first gain body. The orthographic projection of the second gain body on the substrate is symmetrically distributed along the peeling direction. The surface of the second gain body facing away from the substrate is flush with the surface of the first gain body facing away from the substrate; or, the surface of the second gain body facing away from the substrate protrudes toward the side away from the substrate relative to the surface of the first gain body facing away from the substrate.

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