Display panel and manufacturing method thereof

Abstract

The application provides a display panel and a manufacturing method thereof. The display panel comprises a substrate, a light shielding layer arranged on the surface of the substrate, a driving circuit layer arranged on the surface of the substrate and covering the light shielding layer, a first light guide layer arranged below the substrate, a second light guide layer arranged below the first light guide layer, and a light emitting layer arranged below the second light guide layer. The first light guide layer comprises a first light dispersing part and a first light collecting part. The second light guide layer comprises a second light dispersing part and a second light collecting part. The orthographic projections of the first light dispersing part and the second light dispersing part on the light shielding layer both cover the light shielding layer. The light emitting side of the light emitting layer faces the second light guide layer. The backlight emitted by the light emitting layer is dispersed by the second light dispersing part and the first light dispersing part in sequence during the process of irradiation to the light shielding layer, so that the amount of the backlight reaching the light shielding layer is small, thereby avoiding the generation of leakage current of the photosensitive device, and improving the display effect of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel and a method for manufacturing the display panel. Background Technology

[0002] With the continuous development of display technology, people have increasingly higher requirements for the resolution, power consumption and image quality of display products. LTPS (Low Temperature Poly-Silicon) is widely used in the manufacturing process of various display panels with high image quality requirements (e.g., the manufacturing process of HUD (Head-up Display) and VR (Virtual Reality) display panels) due to its advantages such as high resolution, fast response speed and high brightness.

[0003] LTPS (Low-Temperature Polystyrene) materials exhibit photosensitivity. In high-brightness environments, light energy causes carrier energy level jumps, leading to leakage current and affecting display quality. To address this, a light-shielding layer made of molybdenum (Mo) is typically incorporated into the display panel to shield the LTPS from backlighting, preventing strong light from illuminating the LTPS and thus avoiding leakage current. However, to ensure the display panel's electrostatic discharge (ESD) protection, the light-shielding layer is usually quite thin. Furthermore, to maintain sufficient display brightness, the backlight brightness is typically set high, allowing it to penetrate the light-shielding layer and reach the LTPS, resulting in leakage current and a poor display quality. Summary of the Invention

[0004] This application provides a display panel and a method for manufacturing the display panel, which is used to alleviate the technical problem of poor display effect of current display panels.

[0005] To address the aforementioned technical problems, this application provides the following technical solution:

[0006] This application provides a display panel, including:

[0007] Substrate;

[0008] A light-shielding layer is disposed on the surface of the substrate.

[0009] A driving circuit layer is disposed on the surface of the substrate and covers the light-shielding layer;

[0010] A first light guide layer is disposed below the substrate; the first light guide layer includes a first light dispersing portion and a first light concentrating portion, and the orthogonal projection of the first light dispersing portion onto the light shielding layer covers the light shielding layer.

[0011] A second light guide layer is disposed below the first light guide layer; the second light guide layer includes a second light dispersing portion and a second light converging portion, and the orthogonal projection of the second light dispersing portion onto the light shielding layer covers the light shielding layer;

[0012] A light-emitting layer is disposed below the second light-guiding layer; the light-emitting side of the light-emitting layer faces the second light-guiding layer.

[0013] In some embodiments of this application, the first light-dispersing portion includes a concave lens; the first light-concentrating portion includes a convex lens;

[0014] The convex lens has a weaker refractive power than the concave lens.

[0015] In some embodiments of this application, the second light-dispersing portion includes a right-angled triangular prism; the second light-concentrating portion includes an equilateral triangular prism.

[0016] The height of the right-angled prism is not the same as the height of the equilateral prism.

[0017] In some embodiments of this application, the second light-dispersing portion includes a first equilateral prism, the bottom of which is coated with a diffuse reflection material;

[0018] The second light-gathering part includes a second equilateral prism;

[0019] The first equilateral prism and the second equilateral prism have the same height.

[0020] In some embodiments of this application, the driving circuit layer includes:

[0021] A buffer layer is disposed on the surface of the substrate; the light-shielding layer is located within the buffer layer;

[0022] A polycrystalline silicon layer is disposed on the surface of the buffer layer; the orthogonal projection of the light-shielding layer onto the polycrystalline silicon layer covers the polycrystalline silicon layer.

[0023] An insulating layer is disposed on the surface of the buffer layer and covers the polysilicon layer;

[0024] A gate layer is disposed on the surface of the insulating layer.

[0025] In some embodiments of this application, the buffer layer includes a first buffer layer and a second buffer layer stacked sequentially;

[0026] The first buffer layer is attached to the surface of the substrate.

[0027] The second buffer layer is disposed between the first buffer layer and the insulating layer.

[0028] This application also provides a method for manufacturing a display panel, including:

[0029] Provide substrates;

[0030] A light-shielding layer and a driving circuit layer are formed on the surface of the substrate; the driving circuit layer covers the light-shielding layer.

[0031] A first light guide layer is formed beneath the substrate; the first light guide layer includes a first light dispersing portion and a first light concentrating portion, and the orthogonal projection of the first light dispersing portion onto the light shielding layer covers the light shielding layer;

[0032] A second light guide layer is prepared below the first light guide layer; the second light guide layer includes a second light dispersing portion and a second light converging portion, and the orthogonal projection of the second light dispersing portion onto the light shielding layer covers the light shielding layer;

[0033] A light-emitting layer is prepared below the second light guide layer; the light-emitting side of the light-emitting layer faces the second light guide layer.

[0034] The step of fabricating the first light guide layer beneath the substrate includes:

[0035] A concave lens and a convex lens are fabricated beneath the substrate, and the concave lens and the convex lens are arranged according to a preset pattern;

[0036] The concave lens is used as the first light-dispersing part, and the convex lens is used as the first light-concentrating part.

[0037] The step of fabricating a second light guide layer below the first light guide layer includes:

[0038] Right-angled prisms and equilateral prisms of different heights are prepared below the first light guide layer, and the right-angled prisms and equilateral prisms are arranged according to a preset pattern;

[0039] The right-angled prism is used as the second light-dispersing part, and the equilateral prism is used as the second light-concentrating part.

[0040] The step of fabricating a second light guide layer below the first light guide layer further includes:

[0041] A first equilateral prism and a second equilateral prism of equal height are fabricated below the first light guide layer, and a diffuse reflection material is coated on the bottom of the first equilateral prism.

[0042] The first equilateral prism coated with the diffuse reflection material is used as the second light dispersion part, and the second equilateral prism is used as the second light focusing part.

[0043] The display panel and its manufacturing method provided in this application include: a substrate, a light-shielding layer disposed on the surface of the substrate, a driving circuit layer disposed on the surface of the substrate and covering the light-shielding layer, a first light-guiding layer disposed below the substrate, a second light-guiding layer disposed below the first light-guiding layer, and a light-emitting layer disposed below the second light-guiding layer. The first light-guiding layer includes a first light-dispersing portion and a first light-gathering portion, the orthographic projection of the first light-dispersing portion onto the light-shielding layer covering the light-shielding layer. The second light-guiding layer includes a second light-dispersing portion and a second light-gathering portion, the orthographic projection of the second light-dispersing portion onto the light-shielding layer covering the light-shielding layer. The light-emitting side of the light-emitting layer faces the second light-guiding layer. Because the orthographic projections of both the first and second light-dispersing portions onto the light-shielding layer cover the light-shielding layer, the backlight emitted by the light-emitting layer is sequentially dispersed by the second and first light-dispersing portions during its illumination of the light-shielding layer. This results in a smaller amount of backlight reaching the light-shielding layer, preventing backlight penetration and thus avoiding leakage current in the photosensitive device, thereby improving the display effect of the display panel. Attached Figure Description

[0044] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0045] Figure 1 This is a schematic diagram of the structure of the display panel provided in the embodiment of this application.

[0046] Figure 2 This is a schematic diagram of the structure of a display panel in the prior art.

[0047] Figure 3a This is a schematic diagram of the structure of the first light guide layer provided in the embodiments of this application.

[0048] Figure 3b This is another structural schematic diagram of the first light guide layer provided in the embodiments of this application.

[0049] Figure 4a This is a schematic diagram of the structure of the second light guide layer provided in an embodiment of this application.

[0050] Figure 4b This is another structural schematic diagram of the second light guide layer provided in the embodiments of this application.

[0051] Figure 5 This is a flowchart illustrating the manufacturing method of the display panel provided in the embodiments of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0057] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application. The display panel provided in this embodiment includes: a substrate 1, a light-shielding layer 2 disposed on the surface of the substrate 1, a driving circuit layer 3 disposed on the surface of the substrate 1 and covering the light-shielding layer 2, a first light guide layer 4 disposed below the substrate 1, a second light guide layer 5 disposed below the first light guide layer 4, and a light-emitting layer 6 disposed below the second light guide layer 5. The first light guide layer 4 includes a first light-dispersing portion 41 and a first light-gathering portion 42. The orthographic projection of the first light-dispersing portion 41 onto the light-shielding layer 2 covers the light-shielding layer 2. The second light guide layer 5 includes a second light-dispersing portion 51 and a second light-gathering portion 52. The orthographic projection of the second light-dispersing portion 51 onto the light-shielding layer 2 covers the light-shielding layer. The light-emitting side of the light-emitting layer 6 faces the second light guide layer 5.

[0058] The substrate 1 serves as the support structure for the display panel, supporting the functional structural layers within the panel to ensure structural stability. The light-shielding layer 2 balances the intensity of light emitted from the backlight, ensuring uniform illumination throughout the display panel. The driving circuit layer 3 controls the pixel array within the display panel, enabling it to display corresponding images. The first light guide layer 4 and the second light guide layer 5 alter the light path. The first light dispersion section 41 and the second light dispersion section 51 disperse the light in all directions, while the first light gathering section 42 and the second light gathering section 52 converge the light to a single point. The light-emitting layer 6 (i.e., the backlight) emits backlight.

[0059] Specifically, in practical applications, some display products have high requirements for display resolution, power consumption, and image quality. For example, head-up displays project light onto the windshield of a car through a lens, allowing the driver to clearly see driving information even when looking straight ahead. Or, virtual reality displays use 3D graphics technology, multimedia technology, simulation technology, reality technology, and servo technology to generate realistic 3D virtual images. To ensure the display effect of the above-mentioned display products, low-temperature polycrystalline silicon, which has the characteristics of high resolution, fast response speed, and high brightness, is usually selected as the liquid crystal material of the display panel.

[0060] However, low-temperature polycrystalline silicon also exhibits a certain degree of photosensitivity. In high-brightness environments, the light energy causes carrier energy level jumps, making it difficult to effectively suppress off-state currents, leading to leakage current and consequently affecting display performance. Therefore, such as... Figure 2 As shown, a metal light-shielding layer 10 made of Mo is typically placed in the display panel to shield the low-temperature polysilicon 20 from backlight, thereby preventing strong light from irradiating the low-temperature polysilicon 20 and thus avoiding leakage current. To ensure the electrostatic protection capability of the display panel, the thickness of the metal light-shielding layer 10 is usually set to be relatively thin (usually 0.05um). In addition, to ensure the display brightness of the display panel, the backlight brightness is usually set to be high (especially when applied to head-up displays and virtual reality displays, the backlight brightness usually reaches 100,000-200,000 nits), allowing the backlight to penetrate the metal light-shielding layer 10 and irradiate the low-temperature polysilicon 20, causing leakage current and resulting in poor display effect of the display panel (such as image retention, reduced contrast, etc.).

[0061] To avoid the above situation, in this embodiment, as follows: Figure 1 As shown, by sequentially arranging a first light guide layer 4 and a second light guide layer 5 below the substrate 1, and the orthogonal projections of the first light-dispersing portion 41 of the first light guide layer 4 and the second light-dispersing portion 51 of the second light guide layer 5 onto the light-shielding layer 2, the light emitted by the light-emitting layer 6 will be dispersed sequentially by the second light-dispersing portion 51 and the first light-dispersing portion 41 during the process of irradiating the light-shielding layer 2 (the path indicated by the arrow is the light propagation path), resulting in a smaller amount of backlight reaching the light-shielding layer 2 (that is, a smaller light flux of the light-shielding layer 2), thereby preventing backlight from penetrating the light-shielding layer 2, thus avoiding leakage current in the photosensitive device and effectively improving the display effect of the display panel.

[0062] In addition, in this embodiment, the first light gathering part 42 is adjacent to the first light dispersing part 41, and the second light gathering part 52 is adjacent to the second light dispersing part 51. Therefore, the orthographic projections of the first light gathering part 42 and the second light gathering part 52 on the light shielding layer 2 do not intersect with the light shielding layer 2. After the light emitting layer 6 emits backlight, the light will be gathered sequentially by the second light gathering part 52 and the first light gathering part 42, so that the amount of backlight reaching the non-light shielding area is greater (that is, the light flux in the non-light shielding area is greater), thereby increasing the display brightness of the display panel and further improving the display effect of the display panel.

[0063] Specifically, in one embodiment, such as Figure 3a As shown, the first light-scattering part 41 is a concave lens, and the first light-gathering part 42 is a convex lens. The focal length of the concave lens is smaller than that of the convex lens. Therefore, the concave lens has a stronger refractive power, while the convex lens has a weaker refractive power. When light enters the concave lens, the concave lens will scatter it, causing the light rays emitted from the concave lens to disperse in all directions. When light enters the convex lens, the convex lens will converge it, causing the light rays emitted from the convex lens to converge towards the central area (the path indicated by the arrow in the figure is the light propagation path).

[0064] In another embodiment, such as Figure 3b As shown, the first light-scattering part 41 is a first convex lens, and the first light-gathering part 42 is a second convex lens. The first and second convex lenses have different refractive abilities; the first convex lens has a stronger refractive ability, while the second convex lens has a weaker refractive ability. When light enters the first convex lens, it scatters the light, causing the light rays exiting the first convex lens to disperse in all directions. When light enters the second convex lens, it converges the light, causing the light rays exiting the second convex lens to converge towards the central area (the path indicated by the arrow in the figure is the light propagation path).

[0065] It should be noted that, in the actual fabrication process, to effectively reduce the light flux of the light-shielding layer and increase the light flux of the non-shielding area, it is necessary to ensure that the first light-dispersing part is precisely positioned directly below the light-shielding layer and the first light-gathering part is precisely positioned directly below the non-shielding area. Furthermore, the size of the light-shielding layer is typically small (usually 8.5 μm in length and 8 μm in width). Therefore, the alignment accuracy between the first light guide layer and the light-shielding layer is crucial in the actual fabrication process. To this end, in this embodiment, the fabrication precision of the first light guide layer can be controlled to a minimum (typically reaching 1 μm), and the alignment accuracy between the first light guide layer and the light-shielding layer can be controlled within 3 μm. Additionally, the first light guide layer can be planarized using an OC process to make its surface smoother, allowing it to precisely adhere to the surface of the substrate, thereby ensuring high alignment accuracy between the first light guide layer and the light-shielding layer.

[0066] Furthermore, in one embodiment, such as Figure 4a As shown, the second light dispersion section 51 includes a right-angled triangular prism, and the second light focusing section 52 includes an equilateral triangular prism. The heights of the right-angled triangular prism and the equilateral triangular prism are not equal. The right-angled triangular prism and the equilateral triangular prism utilize their internal structural characteristics to control the refraction, total internal reflection, and / or light accumulation of light, thereby controlling the light distribution. Specifically, due to the different internal structures and heights of the right-angled triangular prism and the equilateral triangular prism, the propagation paths of light after entering the right-angled triangular prism and the equilateral triangular prism are also different. When light enters the right-angled triangular prism, it is refracted to the surrounding area, and when light enters the equilateral triangular prism, it is refracted to the central area. In addition, some light falling outside the viewing angle will be reflected back into the viewing angle, thereby reducing light loss and improving the brightness and uniformity of the display panel (the path indicated by the arrow in the figure is the light propagation path).

[0067] In another embodiment, such as Figure 4b As shown, the second light-dispersing part 51 includes a first equilateral prism, and the bottom of the first equilateral prism is coated with a diffuse reflection material 511. The second light-gathering part 52 includes a second equilateral prism. Furthermore, the first and second equilateral prisms have the same height. Specifically, although the internal structure and height of the first and second equilateral prisms are the same, the diffuse reflection material 511 coating on the bottom of the first equilateral prism disperses the light as it passes through it. This causes the light emitted from the first equilateral prism to disperse in all directions, while the light emitted from the second equilateral prism concentrates in the central area (the arrows in the figure indicate the light propagation path). Optionally, in practical applications, a frosted coating can be applied to the bottom of the first equilateral prism to replace the diffuse reflection material.

[0068] It should be noted that in practical applications, the arrangement of the light-dispersing parts (first light-dispersing part and second light-dispersing part) and the light-gathering parts (first light-gathering part and second light-gathering part) is determined by the location of the devices / films within the display panel. For example, if the light incident direction is from bottom to top, devices that need to reduce luminous flux are placed in area A, and devices that need to increase luminous flux are placed in area B. Therefore, the light-dispersing parts are arranged in area A' directly below area A, and the light-gathering parts are arranged in area B' directly below area B, so that the light-dispersing parts and the light-gathering parts can effectively perform the functions of light dispersion / gathering. Therefore, no specific limitation is made on the arrangement of the light-dispersing parts and the light-gathering parts here.

[0069] Furthermore, such as Figure 1As shown, in this embodiment, the driving circuit layer 3 includes: a buffer layer disposed on the surface of the substrate 1, a polysilicon layer 34 disposed on the surface of the buffer layer, an insulating layer 33 disposed on the surface of the buffer layer and covering the polysilicon layer 34, and a gate layer 35 disposed on the surface of the insulating layer 33. The light-shielding layer 2 is located inside the buffer layer, and the orthogonal projection of the light-shielding layer 2 on the polysilicon layer 34 covers the polysilicon layer 34. Specifically, the buffer layer includes a first buffer layer 31 and a second buffer layer 32 stacked sequentially. The first buffer layer 31 is attached to the surface of the substrate 1, and the second buffer layer 32 is disposed between the first buffer layer 31 and the insulating layer 33. Optionally, in this embodiment, since SiNx (silicon nitride) has strong ion-isolating properties, SiNx is used as the material for the preparation of the first buffer layer 31 to block the diffusion of various ions (e.g., Al ions, Ba ions, and Na ions) to the polycrystalline silicon layer 34, thereby further reducing the leakage current generated in the polycrystalline silicon layer 34. In addition, since SiOx (silicon oxide) has a better wetting angle with the polycrystalline silicon surface, SiOx is used as the material for the preparation of the second buffer layer 32. The materials for the preparation of the first buffer layer 31 and the second buffer layer 32 can also be other materials, which are not specifically limited here.

[0070] The display panel provided in this application includes: a substrate, a light-shielding layer disposed on the surface of the substrate, a driving circuit layer disposed on the surface of the substrate and covering the light-shielding layer, a first light guide layer disposed below the substrate, a second light guide layer disposed below the first light guide layer, and a light-emitting layer disposed below the second light guide layer. The first light guide layer includes a first light-dispersing portion and a first light-gathering portion, the orthographic projection of the first light-dispersing portion onto the light-shielding layer covering the light-shielding layer. The second light guide layer includes a second light-dispersing portion and a second light-gathering portion, the orthographic projection of the second light-dispersing portion onto the light-shielding layer covering the light-shielding layer. The light-emitting side of the light-emitting layer faces the second light guide layer. Since the orthographic projections of both the first and second light-dispersing portions onto the light-shielding layer cover the light-shielding layer, the backlight emitted by the light-emitting layer is sequentially dispersed by the second and first light-dispersing portions during its illumination of the light-shielding layer. This results in a smaller amount of backlight reaching the light-shielding layer, preventing backlight penetration and thus avoiding leakage current in the photosensitive device, thereby improving the display effect of the display panel.

[0071] Furthermore, embodiments of this application also provide a method for manufacturing a display panel, such as... Figure 5 As shown, Figure 5 The present application provides a method for manufacturing a display panel, and the specific process is as follows:

[0072] S101. Provide a substrate.

[0073] The substrate serves as the support structure for the display panel, supporting the functional structural layers within the panel to ensure its structural stability.

[0074] Specifically, in the actual display panel manufacturing process, the following performance requirements need to be met for the substrate: strong wear resistance, excellent plastic deformation ability, strong high temperature resistance, high pressure resistance, corrosion resistance, radiation resistance, rust resistance, and impact resistance. Therefore, in this embodiment, PI (Polyimide) with the above properties is selected as the substrate material. It should be noted that one or more combinations of polymer resins selected from polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polycarbonate, and cellulose acetate propionate can also be used as the substrate material. This embodiment of the invention does not specifically limit the choice of substrate material.

[0075] S102. A light-shielding layer and a driving circuit layer are formed on the surface of a substrate, wherein the driving circuit layer covers the light-shielding layer.

[0076] The light-shielding layer is used to balance the intensity of the light emitted by the backlight so that the light illuminating all parts of the display panel is uniform; the driving circuit layer is used to control the pixel array in the display panel so that the pixel array displays the corresponding image.

[0077] S103. A first light guide layer is prepared under the substrate. The first light guide layer includes a first light dispersing portion and a first light concentrating portion. The orthogonal projection of the first light dispersing portion onto the light shielding layer covers the light shielding layer.

[0078] The first light guide layer is used to change the path of light, the first light dispersing part is used to disperse the light in all directions, and the first light gathering part is used to converge the light to one place.

[0079] Specifically, in one embodiment, such as Figure 3a As shown, a concave lens and a convex lens are first fabricated below the substrate. Based on the actual situation, the concave and convex lenses are arranged according to a preset pattern (i.e., the arrangement position of the concave and convex lenses depends on the position of the devices in the display panel). The concave lens is used as the first light-scattering part 41, and the convex lens is used as the first light-gathering part 42. The focal length of the concave lens is smaller than that of the convex lens, so the concave lens has a stronger refractive power and the convex lens has a weaker refractive power. When light is incident on the concave lens, the concave lens will scatter it, causing the light emitted from the concave lens to disperse in all directions. When light is incident on the convex lens, the convex lens will gather it, causing the light emitted from the convex lens to gather in the central area (the path indicated by the arrow in the figure is the light propagation path).

[0080] In another embodiment, such as Figure 3bAs shown, a first convex lens and a second convex lens are first fabricated below the substrate. Based on the actual situation, the first and second convex lenses are arranged according to a preset pattern. The first convex lens serves as the first light-scattering part 41, and the second convex lens serves as the first light-gathering part 42. The first and second convex lenses have different refractive abilities; the first convex lens has a stronger refractive ability, while the second convex lens has a weaker refractive ability. When light is incident on the first convex lens, it is scattered, causing the light emitted from the first convex lens to disperse in all directions. When light is incident on the second convex lens, it is gathered, causing the light emitted from the second convex lens to converge towards the central region (the path indicated by the arrow in the figure is the light propagation path).

[0081] It should be noted that in practical applications, to effectively reduce the light flux of the light-shielding layer and increase the light flux of the non-shielding area, it is necessary to ensure that the first light-dispersing part is precisely positioned directly below the light-shielding layer and the first light-gathering part is precisely positioned directly below the non-shielding area. Furthermore, the size of the light-shielding layer is typically small (usually 8.5 μm in length and 8 μm in width). Therefore, high alignment accuracy between the first light guide layer and the light-shielding layer is required during actual fabrication. To this end, in this embodiment, the fabrication precision of the first light guide layer can be controlled to a minimum (typically reaching 1 μm), and the alignment accuracy between the first light guide layer and the light-shielding layer can be controlled within 3 μm. Additionally, the first light guide layer can be planarized using an OC process to make its surface smoother, allowing it to precisely adhere to the surface of the substrate, thereby ensuring high alignment accuracy between the first light guide layer and the light-shielding layer. Optionally, the temperature range of the glass used in fabricating the first light guide layer is -40 to 110°C.

[0082] Since the orthographic projection of the first light-dispersing part on the light-shielding layer covers the light-shielding layer, the light is dispersed by the first light-dispersing part during the process of shining on the light-shielding layer, resulting in less backlight reaching the light-shielding layer (i.e., less luminous flux of the light-shielding layer). This prevents backlight from penetrating the light-shielding layer, thereby avoiding leakage current in the photosensitive device and effectively improving the display effect of the display panel. In addition, in this embodiment, the first light-gathering part is adjacent to the first light-dispersing part, so the orthographic projection of the first light-gathering part on the light-shielding layer does not intersect with the light-shielding layer. The light is gathered by the first light-gathering part, resulting in more backlight reaching the non-shielding area (i.e., more luminous flux of the non-shielding area), thereby increasing the display brightness of the display panel and further improving the display effect of the display panel.

[0083] S104. A second light guide layer is prepared below the first light guide layer. The second light guide layer includes a second light dispersing portion and a second light converging portion. The orthogonal projection of the second light dispersing portion onto the light shielding layer covers the light shielding layer.

[0084] The second light guide layer is used to change the light path, the second light dispersing part is used to disperse the light in all directions, and the second light gathering part is used to converge the light to one place.

[0085] Specifically, in one embodiment, such as Figure 4a As shown, right-angled prisms and equilateral prisms of different heights are prepared below the first light guide layer. Then, the right-angled prisms and equilateral prisms are arranged according to a preset pattern, with the right-angled prisms serving as the second light dispersion part 51 and the equilateral prisms serving as the second light focusing part 52. The right-angled prisms and equilateral prisms utilize their internal structural characteristics to control the refraction, total internal reflection, and / or light accumulation of light, thereby controlling the light distribution. Specifically, due to the different internal structures and heights of the right-angled prisms and equilateral prisms, the propagation paths of light after entering the right-angled prisms and equilateral prisms are also different. Light entering the right-angled prism is refracted to the surrounding area, while light entering the equilateral prism is refracted to the central area. In addition, some light falling outside the viewing angle will be reflected back into the viewing angle, thereby reducing light loss and improving the brightness and uniformity of the display panel (the path indicated by the arrow in the figure is the light propagation path).

[0086] In another embodiment, such as Figure 4b As shown, a first equilateral prism and a second equilateral prism of equal height are fabricated below the first light guide layer. A diffuse reflection material 511 is coated on the bottom of the first equilateral prism. The first equilateral prism coated with the diffuse reflection material 511 serves as the second light-dispersing part 51, and the second equilateral prism serves as the second light-gathering part 52. Although the internal structure and height of the first and second equilateral prisms are the same, the diffuse reflection material 511 coating on the bottom of the first equilateral prism disperses the light as it passes through it. This causes the light emitted from the first equilateral prism to disperse in all directions, while the light emitted from the second equilateral prism to concentrate in the central area (the path indicated by the arrow in the figure is the light propagation path). Optionally, in practical applications, a frosted coating can be deposited on the bottom of the first equilateral prism to replace the diffuse reflection material.

[0087] Since the orthographic projection of the second light-dispersing part on the light-shielding layer covers the light-shielding layer, the light is dispersed by the second light-dispersing part during the process of shining on the light-shielding layer, resulting in less backlight reaching the light-shielding layer (i.e., less luminous flux of the light-shielding layer). This prevents backlight from penetrating the light-shielding layer, thereby avoiding leakage current in the photosensitive device and effectively improving the display effect of the display panel. In addition, in this embodiment, the second light-gathering part is adjacent to the second light-dispersing part, so the orthographic projection of the second light-gathering part on the light-shielding layer does not intersect with the light-shielding layer. The light is gathered by the second light-gathering part, resulting in more backlight reaching the non-shielding area (i.e., more luminous flux of the non-shielding area), thereby increasing the display brightness of the display panel and further improving the display effect of the display panel.

[0088] S105. Prepare a light-emitting layer below the second light guide layer, with the light-emitting side of the light-emitting layer facing the second light guide layer.

[0089] The light-emitting layer is the light source of the display panel, used to provide light to the display panel. The light-emitting effect of the light-emitting layer directly affects the display effect of the display panel.

[0090] Specifically, the light-emitting layer mainly consists of a light source, a light guide plate, optical templates, and structural components. The light source is mainly divided into three types: EL, CCFL, and LED. The light guide plate is mainly prepared by printing, chemical etching, precision mechanical engraving, photolithography, internal diffusion, and hot pressing. The optical templates are mainly divided into brightness enhancement sheets, diffuser sheets, reflective sheets, and black / white adhesive. The structural components include a back plate (iron back plate, aluminum back plate, and plastic back plate), a frame, a lamp holder, aluminum profiles, and aluminum base strips.

[0091] like Figure 1 As shown, when the light-emitting layer 6 emits backlight, the light is dispersed sequentially by the second light-dispersing part 51 and the first light-dispersing part 41 during the process of shining on the light-shielding layer 2 (the path indicated by the arrow is the light propagation path), so that the amount of backlight reaching the light-shielding layer 2 is less (that is, the light flux of the light-shielding layer 2 is less), thereby preventing the backlight from penetrating the light-shielding layer 2, thereby avoiding leakage current of the photosensitive device and effectively improving the display effect of the display panel.

[0092] As described above, the method for manufacturing a display panel provided in this application first provides a substrate, then forms a light-shielding layer and a driving circuit layer on the surface of the substrate, with the driving circuit layer covering the light-shielding layer. Next, a first light guide layer is fabricated below the substrate, comprising a first light-dispersing portion and a first light-gathering portion. The orthographic projection of the first light-dispersing portion onto the light-shielding layer covers the light-shielding layer. Then, a second light guide layer is fabricated below the first light guide layer, comprising a second light-dispersing portion and a second light-gathering portion. The orthographic projection of the second light-dispersing portion onto the light-shielding layer covers the light-shielding layer. Finally, a light-emitting layer is fabricated below the second light guide layer, with the light-emitting side of the light-emitting layer facing the second light guide layer. Since the orthographic projections of both the first and second light-dispersing portions onto the light-shielding layer cover the light-shielding layer, the backlight emitted from the light-emitting layer is sequentially dispersed by the second and first light-dispersing portions during its illumination of the light-shielding layer. This results in a smaller amount of backlight reaching the light-shielding layer, preventing backlight penetration and thus avoiding leakage current in the photosensitive device, thereby improving the display effect of the display panel.

[0093] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0094] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display panel, characterized in that, include: Substrate; A light-shielding layer is disposed on the surface of the substrate. A driving circuit layer is disposed on the surface of the substrate and covers the light-shielding layer; A first light guide layer is disposed below the substrate; the first light guide layer includes a first light dispersing portion and a first light concentrating portion, and the orthogonal projection of the first light dispersing portion onto the light shielding layer covers the light shielding layer. A second light guide layer is disposed below the first light guide layer; the second light guide layer includes a second light dispersing portion and a second light converging portion, and the orthogonal projection of the second light dispersing portion onto the light shielding layer covers the light shielding layer; A light-emitting layer is disposed below the second light-guiding layer; the light-emitting side of the light-emitting layer faces the second light-guiding layer. The first light-dispersing part includes a concave lens, and the first light-concentrating part includes a convex lens, wherein the refractive power of the convex lens is weaker than that of the concave lens. The second light-dispersing part includes a right-angled triangular prism, and the second light-gathering part includes an equilateral triangular prism, wherein the heights of the right-angled triangular prism and the equilateral triangular prism are not equal; or, the second light-dispersing part includes a first equilateral triangular prism, the bottom of which is coated with a diffuse reflection material, and the second light-gathering part includes a second equilateral triangular prism, wherein the heights of the first equilateral triangular prism and the second equilateral triangular prism are equal.

2. The display panel according to claim 1, characterized in that, The driving circuit layer includes: A buffer layer is disposed on the surface of the substrate; the light-shielding layer is located within the buffer layer; A polycrystalline silicon layer is disposed on the surface of the buffer layer; the orthogonal projection of the light-shielding layer onto the polycrystalline silicon layer covers the polycrystalline silicon layer. An insulating layer is disposed on the surface of the buffer layer and covers the polysilicon layer; A gate layer is disposed on the surface of the insulating layer.

3. The display panel according to claim 2, characterized in that, The buffer layer includes a first buffer layer and a second buffer layer stacked sequentially. The first buffer layer is attached to the surface of the substrate. The second buffer layer is disposed between the first buffer layer and the insulating layer.

4. A method for manufacturing a display panel, characterized in that, include: Provide substrates; A light-shielding layer and a driving circuit layer are formed on the surface of the substrate. The driving circuit layer covers the light-shielding layer; A first light guide layer is fabricated beneath the substrate. The first light guide layer includes a first light dispersing portion and a first light converging portion, wherein the orthographic projection of the first light dispersing portion onto the light shielding layer covers the light shielding layer; A second light guide layer is prepared below the first light guide layer; The second light guide layer includes a second light dispersing portion and a second light converging portion, wherein the orthographic projection of the second light dispersing portion onto the light shielding layer covers the light shielding layer; A light-emitting layer is prepared below the second light guide layer; The light-emitting side of the light-emitting layer faces the second light-guiding layer; The manufacturing method further includes: The step of fabricating the first light guide layer beneath the substrate includes: A concave lens and a convex lens are fabricated beneath the substrate, and the concave lens and the convex lens are arranged according to a preset pattern; The concave lens is used as the first light-dispersing part, and the convex lens is used as the first light-concentrating part; The step of fabricating a second light guide layer below the first light guide layer includes: Right-angled prisms and equilateral prisms of different heights are prepared below the first light guide layer, and the right-angled prisms and equilateral prisms are arranged according to a preset pattern; The right-angled prism is used as the second light-dispersing part, and the equilateral prism is used as the second light-concentrating part; Alternatively, a first equilateral prism and a second equilateral prism of equal height can be fabricated below the first light guide layer, and a diffuse reflection material can be coated on the bottom of the first equilateral prism. The first equilateral prism coated with the diffuse reflection material is used as the second light dispersion part, and the second equilateral prism is used as the second light focusing part.

Images