Display apparatus and preparation method therfor

Abstract

A display apparatus and a preparation method therefor. The display apparatus comprises a display panel (1) and a grating structure arranged on a light-emitting side of the display panel (1). The grating structure comprises a first grating layer (4), a second grating layer (5), and a light-shielding layer (3). The first grating layer (4) is arranged on the light-emitting side of the display panel (1), and comprises a plurality of lens units (41) arranged in an array. The second grating layer (5) is provided on the side of the first grating layer (4) away from the display panel (1) and covers the lens units (41) of the first grating layer (4). The surface of the side of the second grating layer (5) away from the first grating layer (4) is a continuous flat surface. The refractive index of the first grating layer (4) is greater than the refractive index of the second grating layer (5). The orthographic projection of the light-shielding layer (3) on the display panel (1) in a first direction at least partially covers the orthographic projection of an interval region between adjacent lens units (41) on the display panel (1) in the first direction. The first direction is the direction of the second grating layer (5) pointing toward the first grating layer (4). The display apparatus having said structure can improve the quality of a displayed image, thereby improving a 3D display effect.

Description

Display device and manufacturing method thereof Technical Field

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

[0002] As we all know, the 2D (two-dimensional) displays we commonly see cannot provide us with depth information like the real world. The key to our ability to perceive depth (and the 3D effect) is the positional difference between our two eyes, which is approximately 60mm apart from our pupils. These two images, with this "binocular parallax," become a "stereoscopic image pair," which, when fused by the human visual cortex, creates the 3D effect.

[0003] 3D display is divided into naked-eye type and glasses type, among which naked-eye 3D display has attracted much attention. Specifically, the 3D display effect is achieved in the following ways: the left-eye image is input into the left-eye pixel of the display panel, and the right-eye image is input into the right-eye pixel of the display panel; the resin lens grating module forms a lens grating, and the light emitted by the left-eye image and the right-eye image of the display panel passes through the lens grating and enters the left-eye viewing area and the right-eye viewing area respectively. Although the 3D display device in the related art can meet the display effect, it directly focuses multi-directional light through the grating, and the grating is difficult to manufacture, and the display effect is poor. As consumer demand becomes higher and higher, in order to improve the user experience, a display device and preparation method with better 3D effect and simpler manufacturing process is urgently needed.

[0004] Summary of the Invention

[0005] In view of the shortcomings of the related art, the present application proposes a display device and a manufacturing method thereof, so as to solve the problems of poor display effect or complex manufacturing process of 3D display devices in the related art.

[0006] The present application provides a display device, comprising a display panel and a grating structure disposed on a light-emitting side of the display panel, the grating structure comprising a first grating layer, a second grating layer, and a light-shielding layer. The first grating layer is disposed on the light-emitting side of the display panel and comprises a plurality of lens units arranged in an array. The second grating layer is disposed on a side of the first grating layer away from the display panel, covering the lens units on the first grating layer. The surface of the second grating layer on a side away from the first grating layer is a continuous plane, and the refractive index of the first grating layer is greater than the refractive index of the second grating layer. The orthographic projection of the light-shielding layer on the display panel along a first direction at least partially covers the orthographic projection of the interval region between adjacent lens units on the display panel along the first direction. The first direction is the direction from the second grating layer to the first grating layer.

[0007] As can be seen from the above embodiments, compared to conventional technologies that use only a single grating structure to focus multi-directional light, the grating structure in this application utilizes a first grating layer and a second grating layer in conjunction with each other. On the one hand, the second grating layer protects the lens units in the first grating layer. On the other hand, the greater the refractive index difference between the second grating layer and the first grating layer, the smaller the lens arch height can be. Therefore, by adjusting the refractive index, the lens arch height in the first grating layer can be adjusted, thereby reducing the thickness of the display device and improving the product's aesthetics. Furthermore, the grating structure in this application includes a light-shielding layer between adjacent lens units, perpendicular to the panel direction, which can reduce light crosstalk between pixels of different colors within the display panel, improve the quality of the displayed image, and thus enhance the 3D display effect.

[0008] In one embodiment, the shading layer is disposed on the light-emitting side of the display panel, the shading layer is located in the spacing area between adjacent lens units, and the size of the shading layer along the first direction is smaller than the maximum size of the lens unit along the first direction.

[0009] In one embodiment, a size of the light shielding layer along the first direction is one fiftieth to one tenth of a maximum size of the lens unit along the first direction.

[0010] In one embodiment, the light shielding layer is disposed on a side of the second grating layer away from the first grating layer, and a dimension of the light shielding layer along the first direction is smaller than a minimum dimension of the second grating layer along the first direction.

[0011] In one embodiment, a size of the light shielding layer along the first direction is one fiftieth to one tenth of a minimum size of the second grating layer along the first direction.

[0012] The present application also provides a display device, comprising a display panel and a grating structure arranged on a light-emitting side of the display panel, the grating structure comprising a first grating layer and a second grating layer, wherein the first grating layer is arranged on a surface of the light-emitting side of the display panel, the first grating layer comprising a planarization layer covering the display panel and a plurality of arrayed lens units located on a side of the planarization layer away from the display panel, the surface of the planarization layer away from the lens units being a continuous plane, and the planarization layer and the lens units being made of the same material; the second grating layer is arranged on a side of the first grating layer away from the display panel, covering the lens units on the first grating layer, the surface of the second grating layer away from the first grating layer being a continuous plane, and the refractive index of the first grating layer being greater than the refractive index of the second grating layer.

[0013] In one embodiment, the plurality of lens units and the planarization layer are relatively independent structures;

[0014] In one embodiment, the plurality of lens units are integrally formed with the planarization layer.

[0015] The present application also provides a display device, comprising a display panel and a grating structure disposed on a light-emitting side of the display panel, wherein the grating structure comprises a first grating layer and a second grating layer; the first grating layer comprises a plurality of lens units arranged in an array, with convex surfaces of the lens units facing the light-emitting side of the display panel; the second grating layer is located between the first grating layer and the display panel, covering the lens units on the first grating layer, a surface of the second grating layer on a side away from the first grating layer being a continuous plane, and a refractive index of the first grating layer being greater than a refractive index of the second grating layer; the display device further comprises a light-shielding layer, the light-shielding layer being located on the light-emitting side of the display panel, an orthographic projection of the light-shielding layer on the display panel along a first direction at least partially covering an orthographic projection of a spacing region between adjacent lens units on the display panel along the first direction, wherein the first direction is the direction from the second grating layer toward the first grating layer.

[0016] The present application also provides a method for preparing a display device, comprising:

[0017] forming a display panel;

[0018] A grating structure is formed on the display panel, wherein the grating structure includes a first grating layer and a second grating layer sequentially stacked on the display panel, the first grating layer includes a plurality of lens units arranged in an array, the second grating layer covers the lens units on the first grating layer, a surface of the second grating layer on a side away from the first grating layer is a continuous plane, and the refractive index of the first grating layer is greater than the refractive index of the second grating layer; the grating structure also includes a light shielding layer, an orthographic projection of the light shielding layer along a first direction on the display panel at least partially covers an orthographic projection of a space between adjacent lens units along the first direction on the display panel, where the first direction is the direction from the second grating layer to the first grating layer.

[0019] In one embodiment, forming a grating structure on the display panel includes:

[0020] forming an alignment mark on the display panel;

[0021] forming a light shielding layer on the display panel according to the alignment mark, wherein the light shielding layer includes a plurality of light shielding blocks distributed at intervals;

[0022] forming the lens unit in the interval between adjacent light shielding blocks;

[0023] The second grating layer is covered on the lens unit and the light shielding block.

[0024] In one embodiment, forming the lens unit in the interval between adjacent light shielding blocks comprises:

[0025] forming a first photosensitive material layer in the intervals between adjacent light-shielding blocks;

[0026] performing patterning on the first photosensitive material layer to form a grating transition pattern;

[0027] performing ultraviolet light exposure processing on the grating transition pattern;

[0028] The grating transition pattern is subjected to a low-temperature thermal reflow process at a temperature of 150° C. or below to form a plurality of lens units arranged in an array.

[0029] In one embodiment, forming a grating structure on the display panel includes:

[0030] providing a lens substrate;

[0031] forming at least one alignment mark on the lens substrate;

[0032] forming a plurality of light shielding blocks arranged in an array on the lens substrate according to the alignment marks;

[0033] forming the lens unit in the interval between adjacent light shielding blocks;

[0034] Covering the lens unit and the light shielding block with the second grating layer to obtain the grating structure;

[0035] The side of the grating structure close to the lens substrate is bonded to the light-emitting side of the display panel.

[0036] In one embodiment, forming a grating structure on the display panel includes:

[0037] providing a lens substrate;

[0038] forming the lens units arranged in an array and at least one alignment mark on the lens substrate;

[0039] covering the second grating layer on the lens unit and the alignment mark;

[0040] forming a light shielding layer on a side of the second grating layer away from the lens unit to obtain the grating structure;

[0041] The side of the grating structure close to the lens substrate is bonded to the light-emitting side of the display panel.

[0042] In one embodiment, the lens units and at least one alignment mark arranged in an array on the lens substrate include:

[0043] Providing a first imprint template, the first imprint template comprising a substrate and a plurality of lens units arranged in an array and at least one alignment mark disposed on the substrate;

[0044] Coating an imprinting material on a side of the first imprinting template close to the lens unit, so that the imprinting material forms a second imprinting template;

[0045] forming a second photosensitive material layer on the lens substrate;

[0046] The second photosensitive material layer on the lens substrate is subjected to a molding process using the second imprint template to form the lens units arranged in an array and at least one alignment mark, and then the mold is released.

[0047] The present application also provides a method for preparing a display device, comprising:

[0048] forming a display panel;

[0049] A grating structure is formed on the display panel, wherein the grating structure includes a first grating layer and a second grating layer sequentially stacked on the display panel, the first grating layer includes a planarization layer covering the display panel and a plurality of arrayed lens units located on a side of the planarization layer away from the display panel, the surface of the planarization layer away from the lens units is a continuous plane, and the planarization layer and the lens units are made of the same material; the second grating layer covers the lens units on the first grating layer, the surface of the second grating layer away from the first grating layer is a continuous plane, and the refractive index of the first grating layer is greater than the refractive index of the second grating layer.

[0050] In one embodiment, forming a grating structure on the display panel includes:

[0051] providing a lens substrate;

[0052] forming at least one alignment mark on the lens substrate;

[0053] forming the second grating layer on the lens substrate according to the alignment mark;

[0054] forming the first grating layer on a side of the second grating layer away from the lens substrate to obtain the grating structure;

[0055] The side of the grating structure close to the first grating layer is bonded to the light-emitting side of the display panel.

[0056] In one embodiment, forming the second grating layer on the lens substrate according to the alignment mark comprises:

[0057] Providing a third imprint template, the third imprint template comprising a substrate and a plurality of lens units arranged in an array and disposed on the substrate, and at least one alignment mark;

[0058] forming a third photosensitive material layer on the lens substrate;

[0059] The third photosensitive material layer on the lens substrate is subjected to a compression molding process using the third embossing template to form the second grating layer, and then demolding is performed.

[0060] The present application also provides a method for preparing a display device, comprising:

[0061] forming a display panel;

[0062] forming a light shielding layer and at least one alignment mark on a light-emitting side of the display panel;

[0063] A grating structure is formed on a side of the light-shielding layer away from the display panel, the grating structure comprising a first grating layer and a second grating layer; the first grating layer comprises a plurality of lens units arranged in an array, with convex surfaces of the lens units facing the light-emitting side of the display panel; the second grating layer is located between the first grating layer and the display panel, covering the lens units on the first grating layer; a surface of the second grating layer away from the first grating layer is a continuous plane, and a refractive index of the first grating layer is greater than a refractive index of the second grating layer.

[0064] In one embodiment, forming a grating structure on a side of the light shielding layer away from the display panel includes:

[0065] providing a lens substrate;

[0066] forming the lens units arranged in an array and at least one alignment mark on the lens substrate;

[0067] covering the lens unit and the alignment mark with the second grating layer to obtain the grating structure;

[0068] The side of the grating structure close to the second grating layer is laminated to the side of the light shielding layer away from the display panel.

[0069] Additional aspects and advantages of the present application will be given in part in the following description, which will become apparent from the following description, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0071] 1a to 1f are schematic structural diagrams of the steps of a method for manufacturing a display device provided in an embodiment of the present application;

[0072] 2a to 2d are schematic structural diagrams of the steps of another method for manufacturing a display device provided in an embodiment of the present application;

[0073] 3a to 3d are schematic structural diagrams of the steps of another method for manufacturing a display device provided in an embodiment of the present application;

[0074] 4a to 4e are schematic structural diagrams of the steps of a method for manufacturing a display device in step 3a provided in an embodiment of the present application;

[0075] 5a to 5c are schematic structural diagrams of the steps of another method for manufacturing a display device provided in an embodiment of the present application;

[0076] 6a to 6b are schematic structural diagrams of the steps of a method for manufacturing a display device in step 5a provided in an embodiment of the present application;

[0077] 7a to 7e are schematic structural diagrams of the steps of another method for manufacturing a display device provided in an embodiment of the present application;

[0078] FIG8 is a comparison diagram showing the results of the preparation processes of the embodiment of the present application and the related art.

[0079] In the figure: 1-display panel; 2-alignment mark; 3-light-shielding layer; 4-first grating layer; 41-lens unit; 42-planarization layer; 5-second grating layer; 6-lens substrate; 7-glue layer; 8-first imprint template; 9-second imprint template; 10-third imprint template; 01-first photosensitive material layer; 02-grating transition pattern; 03-second photosensitive material layer; 04-fourth photosensitive material layer. DETAILED DESCRIPTION

[0080] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0081] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0082] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or region, it may mean that it is directly on the other layer or region, or that other layers or regions are included between it and the other layer or region. Furthermore, if the component is turned over, the layer or region will be "below" or "beneath" the other layer or region.

[0083] Currently, 3D displays are divided into two types: glasses-based and naked-eye-based. Digital maskless lithography systems are currently being used in 3D display devices, using micromirrors as spatial light modulators to replace the masks used in traditional lithography. However, directly focusing multi-directional light through gratings is difficult to manufacture and results in poor display quality.

[0084] The display device and the manufacturing method thereof provided in this application are intended to solve the above technical problems in the related art.

[0085] The display panel and the display device in the embodiments of the present application are described in detail below with reference to the accompanying drawings. In the absence of conflict, the features in the following embodiments can complement or be combined with each other.

[0086] A display device provided in an embodiment of the present invention may be a liquid crystal display (LCD), or may be another type of display device such as an organic light-emitting diode (OLED) or a micro-LED.

[0087] An embodiment of the present application provides a display device, as shown in Figures 1f, 2d, and 3d, comprising a display panel 1 and a grating structure arranged on the light-emitting side of the display panel 1, wherein the grating structure comprises a first grating layer 4, a second grating layer 5, and a light-shielding layer 3, wherein the first grating layer 4 is arranged on the light-emitting side of the display panel 1, and the first grating layer 4 comprises a plurality of lens units 41 arranged in an array; the second grating layer 5 is arranged on a side of the first grating layer 4 away from the display panel 1, covering the lens units 41 on the first grating layer 4, the surface of the second grating layer 5 on the side away from the first grating layer 4 being a continuous plane, and the refractive index of the first grating layer 4 being greater than the refractive index of the second grating layer 5; the orthographic projection of the light-shielding layer 3 on the display panel 1 along a first direction x at least partially covers the orthographic projection of the spacing area between adjacent lens units 41 on the display panel 1 along the first direction x, where the first direction x is the direction from the second grating layer 5 to the first grating layer 4.

[0088] According to the above embodiments, compared to conventional technologies that use only a single grating structure to focus multi-directional light, the grating structure in this application utilizes a first grating layer 4 and a second grating layer 5 in conjunction with each other. On the one hand, the second grating layer 5 can protect the lens units 41 in the first grating layer 4. On the other hand, the greater the refractive index difference between the second grating layer 5 and the first grating layer 4, the smaller the lens arch height can be. Therefore, the arch height of the lens in the first grating layer 4 can be adjusted by adjusting the refractive index, thereby thinning the display device and improving the product's aesthetics. Furthermore, the grating structure in this application includes a light-shielding layer 3 between adjacent lens units 41, perpendicular to the panel direction, which can reduce light crosstalk between pixel units of different colors within the display panel 1, improve the quality of the displayed image, and thus enhance the 3D display effect.

[0089] In some embodiments, as shown in Figure 1f and Figure 2d, the shading layer 3 is arranged on the light-emitting side of the display panel 1, and the shading layer 3 is located in the spacing area between adjacent lens units 41. The dimension h1 of the shading layer 3 along the first direction x is smaller than the maximum dimension h2 of the lens unit 41 along the first direction x.

[0090] It should be noted that in the photolithography process, lenses in related art cannot achieve a completely gapless structure. When using a digital exposure machine to produce grating structures, the gap between lenses is determined by the resolution of the digital exposure machine. While exposure machines in related art produce grating structures with gaps exceeding 2μm, digital exposure machines can achieve 1μm or even 0.7μm, resulting in smaller gaps and higher precision. Therefore, digital exposure machines are preferably used for production. The pitch of lenses produced using digital exposure machines ranges from 0.7μm to 5μm.

[0091] In some embodiments, the dimension of the light shielding layer 3 along the first direction x is between one-fiftieth and one-tenth the maximum dimension of the lens unit 41 along the first direction x. This ensures that the light shielding layer 3 does not affect the emission of light between pixel units in the display panel 1, while also preventing light leakage and avoiding crosstalk between pixels of different colors. In one example, the dimension of the light shielding layer 3 along the first direction x is 1 μm, and the dimension of the lens unit 41 along the first direction x is 12 μm.

[0092] In some embodiments, as shown in FIG3d , the light shielding layer 3 is disposed on a side of the second grating layer 5 away from the first grating layer 4 , and the dimension h1 of the light shielding layer 3 along the first direction x is smaller than the minimum dimension h3 of the second grating layer 5 along the first direction x. This embodiment prevents indirect light from being blocked by the light shielding layer 3 , thereby improving light utilization efficiency.

[0093] In some embodiments, the dimension of the light shielding layer 3 along the first direction x is one-fiftieth to one-tenth of the minimum dimension of the second grating layer 5 along the first direction x. In one example, the dimension of the light shielding layer 3 along the first direction x is 1 μm, and the minimum dimension of the second grating layer 5 along the first direction x is 30 μm.

[0094] In some embodiments, the diameter of the lens unit 41 is 1-10 μm, and the dimension h2 of the lens unit 41 along the first direction x is 1-50 μm. Furthermore, the dimension h2 of the lens unit 41 along the first direction x is 21-31 μm. Furthermore, the diameter / height of the lens unit 41 is 2-9.

[0095] In some embodiments, the difference between the refractive index of the first grating layer 4 and the refractive index of the second grating layer 5 is greater than or equal to 0.03. In one example, the refractive index of the first grating layer 4 is 1.63, and the refractive index of the second grating layer 5 is 1.42-1.5.

[0096] In some embodiments, the grating structure further includes a lens substrate 6, as shown in Figures 2d and 3d. The lens substrate 6 is located on the side of the first grating layer 4 close to the display panel 1. The lens substrate 6 and the display panel 1 are bonded and fixed by an adhesive layer 7. Exemplarily, the adhesive layer 7 is OCA optical adhesive.

[0097] In some embodiments, the lens substrate 6 is made of a light-transmitting material.

[0098] In some embodiments, the lens unit 41 is a cylindrical lens or a spherical lens.

[0099] Based on the same inventive concept, the present application also provides a display device, as shown in Figure 5c, comprising a display panel 1 and a grating structure arranged on the light-emitting side of the display panel 1, the grating structure comprising a first grating layer 4 and a second grating layer 5, wherein the first grating layer 4 is arranged on the surface of the light-emitting side of the display panel 1, the first grating layer 4 comprises a planarization layer 42 covering the display panel 1 and a plurality of arrayed lens units 41 located on a side of the planarization layer 42 away from the display panel 1, the surface of the planarization layer 42 away from the lens units 41 is a continuous plane, and the material of the planarization layer 42 and the lens units 41 is the same; the second grating layer 5 is arranged on a side of the first grating layer 4 away from the display panel 1, covering the lens units 41 on the first grating layer 4, the surface of the second grating layer 5 away from the first grating layer 4 is a continuous plane, and the refractive index of the first grating layer 4 is greater than the refractive index of the second grating layer 5.

[0100] In the grating structure of this embodiment, since the first grating layer 4 includes a planarization layer 42 and a plurality of lens units 41 arranged in an array on a side of the planarization layer 42 away from the display panel 1, and the material of the planarization layer 42 is the same as that of the lens units 41, parallel emitted light will converge after encountering the lenses. Therefore, no light shielding layer 3 is required to ensure that light between pixel units of different colors in the display panel 1 is not interfered with, thereby ensuring a 3D display effect and improving display quality.

[0101] In some embodiments, the plurality of lens units 41 and the planarization layer 42 are relatively independent structures.

[0102] In some embodiments, the plurality of lens units 41 are integrally formed with the planarization layer 42. Those skilled in the art may select different designs according to actual conditions.

[0103] Based on the same inventive concept, the present application also provides a display device, as shown in FIG7e , comprising a display panel 1 and a grating structure arranged on the light-emitting side of the display panel 1 , wherein:

[0104] The grating structure includes a first grating layer 4 and a second grating layer 5; the first grating layer 4 includes a plurality of lens units 41 arranged in an array, with the convex surfaces of the lens units 41 facing the light-emitting side of the display panel 1; the second grating layer 5 is located between the first grating layer 4 and the display panel 1, and covers the lens units 41 on the first grating layer 4. The surface of the second grating layer 5 away from the first grating layer 4 is a continuous plane, and the refractive index of the first grating layer 4 is greater than the refractive index of the second grating layer 5.

[0105] The display device also includes a light-shielding layer 3, which is located on the light-emitting side of the display panel 1. The orthographic projection of the light-shielding layer 3 on the display panel 1 along the first direction x at least partially covers the orthographic projection of the spacing area between adjacent lens units 41 on the display panel 1 along the first direction x. The first direction x is the direction from the second grating layer 5 to the first grating layer 4.

[0106] The convex surface of the lens in this embodiment faces the light-emitting side of the display panel 1. At the same time, the light-shielding layer 3 can be first arranged on the light-emitting side of the display panel 1, and the preparation process of the grating structure can be carried out simultaneously. In the actual preparation process, it can be flexibly selected according to different needs. The prepared display device can achieve the same beneficial effects as the aforementioned embodiment.

[0107] Based on the same inventive concept, the present application also provides a method for preparing a display device, comprising the following steps:

[0108] Step 100: forming a display panel 1;

[0109] Step 200: forming a grating structure on the display panel 1, wherein the grating structure includes a first grating layer 4 and a second grating layer 5 sequentially stacked on the display panel 1, the first grating layer 4 including a plurality of lens units 41 arranged in an array, the second grating layer 5 covering the lens units 41 on the first grating layer 4, a surface of the second grating layer 5 on a side away from the first grating layer 4 being a continuous plane, and a refractive index of the first grating layer 4 being greater than a refractive index of the second grating layer 5; the grating structure further includes a light shielding layer 3, an orthographic projection of the light shielding layer 3 along a first direction x on the display panel 1 at least partially covering an orthographic projection of a space between adjacent lens units 41 along the first direction x on the display panel 1, where the first direction x is the direction from the second grating layer 5 to the first grating layer 4.

[0110] In some embodiments, step S200 includes the following steps:

[0111] Step 2110: As shown in FIG. 1 a , forming an alignment mark 2 on the display panel 1 ;

[0112] Step 2120: As shown in FIG1 b , a light shielding layer 3 is formed on the display panel 1 according to the alignment mark 2 , wherein the light shielding layer 3 includes a plurality of light shielding blocks distributed at intervals.

[0113] Step 2130: As shown in FIG. 1 c to FIG. 1 e , a lens unit 41 is formed in the interval between adjacent light shielding blocks;

[0114] Step 2140: As shown in FIG1 f , a second grating layer 5 is covered on the lens unit 41 and the light shielding block.

[0115] In this embodiment, the grating structure is directly formed on the display panel 1 without the aid of other auxiliary layers, thereby improving the efficiency of the overall manufacturing process.

[0116] In some embodiments, step 2130 includes the following steps:

[0117] Step 2131: As shown in FIG1 c , forming a first photosensitive material layer 01 in the interval between adjacent light-shielding blocks;

[0118] Step 2132: As shown in FIG1 d , patterning the first photosensitive material layer 01 to form a grating transition pattern 02 ;

[0119] Step 2133: As shown in FIG1e , the grating transition pattern 02 is subjected to UV exposure processing;

[0120] Step 2134: As shown in FIG. 1 e , the grating transition pattern 02 is subjected to a low-temperature thermal reflow process at a temperature of 150° C. or below to form a plurality of lens units 41 arranged in an array.

[0121] In this embodiment, the ultraviolet light exposure process (bleaching) in step 2133 can effectively improve the transmittance of the first grating layer 4, causing the molecules in the coating material that affect the transmittance to undergo a cross-linking reaction, forming transparent molecules, and improving the transmittance of the coating material. Specifically, as shown in Figure 8, the light transmittance in the process without bleaching is significantly lower than that in the process with bleaching. In addition, in step 2134 of this embodiment, the grating structure is integrated on the display panel 1 under low temperature conditions, which can avoid the impact of high temperature conditions on the internal structure of the display panel 1. For example, the material properties of the liquid crystal layer in the LCD and the EL layer in the OLED will be affected under high temperature conditions, causing damage to the entire display device. Therefore, in this embodiment, the use of low-temperature heat reflow treatment at a temperature below 150°C (greater than or equal to 100°C) solves the problem that lens production is incompatible with the equipment and processes of the flat panel display factory. This can improve the efficiency of the production process and enhance the 3D display effect.

[0122] In some embodiments, as shown in Figure 1d, the grating transition pattern 02 includes multiple grating modules, the grating module includes a symmetrical first part and a second part, the first part includes multiple sub-units in a stepped structure, and the thickness of the multiple sub-units gradually decreases in the direction from close to the display panel 1 to away from the display panel 1.

[0123] In some embodiments, as shown in FIG1d , the height h4 of the subunit is 0.5 to 0.9 μm, and the width x1 is 0.7 to 1 μm. It should be noted that in some embodiments, the number of subunits can be multiple, and the thicknesses of the multiple subunits can be equal. For example, the number of subunits is 15, and the height of each subunit is 0.6 μm.

[0124] In some embodiments, the aperture deviation of the lens in the display device manufactured using this embodiment is ≤±0.05 μm, TP ≤±1.5 μm, and rotation deviation ≤0.01°, which demonstrates the optimization effect of the manufacturing process of this embodiment.

[0125] In some embodiments, step S200 includes the following steps:

[0126] Step 2210: providing a lens substrate 6;

[0127] Step 2220: As shown in FIG. 2 a , forming at least one alignment mark 2 on the lens substrate 6 ;

[0128] Step 2230: As shown in FIG. 2 a , a plurality of light shielding blocks arranged in an array are formed on the lens substrate 6 according to the alignment mark 2 ;

[0129] Step 2240: As shown in FIG2 b , a lens unit 41 is formed in the interval between adjacent light shielding blocks;

[0130] Step 2250: As shown in FIG2 c , a second grating layer 5 is covered on the lens unit 41 and the light shielding block to obtain a grating structure;

[0131] Step 2260 : As shown in FIG. 2 d , the side of the grating structure close to the lens substrate 6 is bonded to the light-emitting side of the display panel 1 .

[0132] In the preparation method of this embodiment, a lens substrate 6 is added to prepare the grating structure separately before bonding it to the display panel 1. Although this increases the complexity of the preparation process, the temperature during the preparation of the grating structure is no longer restricted. Either high-temperature thermal reflow (150°C or above, preferably 230°C) or low-temperature thermal reflow (below 150°C) can be used to integrate the grating structure on the display panel 1. This reduces the restrictions on process conditions.

[0133] In some embodiments, step S200 includes the following steps:

[0134] Step 2310: providing a lens substrate 6;

[0135] Step 2320: As shown in FIG3 a , an array of lens units 41 and at least one alignment mark 2 are formed on the lens substrate 6 ;

[0136] Step 2330: As shown in FIG3 b , a second grating layer 5 is covered on the lens unit 41 and the alignment mark 2 ;

[0137] Step 2340: As shown in FIG3 c , a light shielding layer 3 is formed on a side of the second grating layer 5 away from the lens unit 41 to obtain a grating structure;

[0138] Step 2350 : As shown in FIG3 d , the side of the grating structure close to the lens substrate 6 is bonded to the light-emitting side of the display panel 1 .

[0139] The preparation method in this embodiment adopts a preparation method of first forming the first grating layer 4 and the second grating layer 5 and then forming the light shielding layer 3. Its beneficial effects are the same as those of the above embodiments and will not be repeated here.

[0140] In some embodiments, step S2320 includes the following steps:

[0141] Step S2321: As shown in FIG4 a , providing a first imprint template 8 , the first imprint template 8 comprising a substrate and a plurality of lens units 41 arranged in an array and at least one alignment mark 2 disposed on the substrate;

[0142] Step S2322: As shown in FIG. 4 b to FIG. 4 c , an imprinting material is applied to a side of the first imprinting template 8 close to the lens unit 41 to form a second imprinting template 9 with the imprinting material;

[0143] Step S2323: as shown in FIG4 d , forming a second photosensitive material layer 03 on the lens substrate 6 ;

[0144] Step S2324: as shown in FIG. 4 d to 4 e , the second photosensitive material layer 03 on the lens substrate 6 is subjected to a compression molding process using a second embossing template 9 to form an array of lens units 41 and at least one alignment mark 2 , and then the mold is released.

[0145] Traditional photolithography machines, due to the diffraction phenomenon of light, require careful calculation of the degree of deviation caused by diffraction during design. This process then reversely deduces the necessary modifications to the template pattern to achieve the desired pattern. In contrast, the nanoimprint lithography technology provided in this embodiment, which utilizes two-stage stamping, can achieve highly accurate pattern alignment, reduce processing errors, improve the accuracy of the grating structure on the display panel 1, and enhance the 3D display effect.

[0146] Based on the same inventive concept, the present application also provides another method for preparing a display device, comprising the following steps:

[0147] Step 100 ′: forming a display panel 1 ;

[0148] Step 200': forming a grating structure on the display panel 1, wherein the grating structure includes a first grating layer 4 and a second grating layer 5 sequentially stacked on the display panel 1, the first grating layer 4 including a planarization layer 42 covering the display panel 1 and a plurality of arrayed lens units 41 located on a side of the planarization layer 42 away from the display panel 1, the surface of the planarization layer 42 away from the lens units 41 being a continuous plane, and the planarization layer 42 and the lens units 41 being made of the same material; the second grating layer 5 covering the lens units 41 on the first grating layer 4, the surface of the second grating layer 5 away from the first grating layer 4 being a continuous plane, and the refractive index of the first grating layer 4 being greater than the refractive index of the second grating layer 5.

[0149] In some embodiments, step 200' includes the following steps:

[0150] Step 210 ′: As shown in FIG5 a , provide a lens substrate 6 ;

[0151] Step 220 ′: as shown in FIG5 a , forming at least one alignment mark 2 on the lens substrate 6 ;

[0152] Step 230 ′: as shown in FIG. 5 a , forming a second grating layer 5 on the lens substrate 6 according to the alignment mark 2 ;

[0153] Step 240 ′: as shown in FIG5 b , forming a first grating layer 4 on a side of the second grating layer 5 away from the lens substrate 6 to obtain a grating structure;

[0154] Step 250 ′: as shown in FIG5 c , the side of the grating structure close to the first grating layer 4 is laminated to the light-emitting side of the display panel 1 .

[0155] In some embodiments, step 230' includes the following steps:

[0156] Step 231 ′: as shown in FIG6 a , providing a third imprint template 10 , the third imprint template 10 comprising a substrate and a plurality of lens units 41 arranged in an array and disposed on the substrate, and at least one alignment mark 2 ;

[0157] Step 232 ′: as shown in FIG6 a , forming a third photosensitive material layer 04 on the lens substrate 6 ;

[0158] Step 233 ′: as shown in FIG. 6 a and FIG. 6 b , the third photosensitive material layer 04 on the lens substrate 6 is subjected to a compression molding process using a third embossing template 10 to form a second grating layer 5 , and then demolding is performed.

[0159] In this embodiment, a one-time nanoimprinting process is used to first form a second grating layer 5 with a recess, and then form a first grating layer 4. The first grating layer 4 includes an integrally formed planarization layer 42 and a plurality of lenses arranged in an array, which can prevent light leakage from the grating structure without the need for a light-shielding layer 3. Therefore, the display effect of the display device can be improved while simplifying the process.

[0160] In some embodiments, step 240' includes the following steps:

[0161] A fourth photosensitive material layer is formed on a side of the second grating layer 5 away from the lens substrate 6 , and the side of the fourth photosensitive material layer away from the second grating layer 5 is a continuous plane.

[0162] In this embodiment, the side of the fourth photosensitive material layer away from the second grating layer 5 is a continuous plane, which can form a planarization layer 42 with a certain thickness, which is conducive to light focusing.

[0163] Based on the same inventive concept, the present application also provides a method for preparing a display device, comprising the following steps:

[0164] Step 100 ”: as shown in FIG7 a , forming a display panel 1 ;

[0165] Step 200 ″: as shown in FIG7 b , a light shielding layer 3 and at least one alignment mark 2 are formed on the light-emitting side of the display panel 1 ;

[0166] Step 300": As shown in Figures 7c and 7e, a grating structure is formed on the side of the light-shielding layer 3 away from the display panel 1. The grating structure includes a first grating layer 4 and a second grating layer 5. The first grating layer 4 includes a plurality of lens units 41 arranged in an array, with the convex surfaces of the lens units 41 facing the light-emitting side of the display panel 1. The second grating layer 5 is located between the first grating layer 4 and the display panel 1. The second grating layer 5 covers the lens units 41 on the first grating layer 4. The surface of the second grating layer 5 away from the first grating layer 4 is a continuous plane. The refractive index of the first grating layer 4 is greater than the refractive index of the second grating layer 5.

[0167] In some embodiments, step 300" includes the following steps:

[0168] Step 310 ″: As shown in FIG7 c , providing a lens substrate 6 ;

[0169] Step 320 ″: as shown in FIG7 c , an array of lens units 41 and at least one alignment mark 2 are formed on the lens substrate 6 ;

[0170] Step 330 ″: as shown in FIG7 d , a second grating layer 5 is covered on the lens unit 41 and the alignment mark 2 to obtain a grating structure;

[0171] Step 340 ″: as shown in FIG7 e , the side of the grating structure close to the second grating layer 5 is laminated to the side of the light shielding layer 3 away from the display panel 1 .

[0172] This embodiment also uses nanoimprint technology, and the template selected is a densely packed template. Therefore, it is different from the previous embodiment. The convex surface of the lens in this embodiment faces the light-emitting side of the display panel 1, providing more application possibilities in different scenarios.

[0173] It should be noted that the 3D display device can be any device that displays images, whether in motion (e.g., video) or fixed (e.g., still images), and whether text or images. More specifically, it is contemplated that the embodiments may be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, camcorders, game consoles, watches, clocks, calculators, television monitors, flat-panel displays, computer monitors, automotive displays (e.g., odometer displays, etc.), navigation systems, cockpit controls and / or displays, displays of camera views (e.g., displays of rearview cameras in vehicles), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0174] The above embodiments of the present application can complement each other if no conflict occurs.

[0175] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it may be the only layer between the two layers or elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0176] The terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on this application.

[0177] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0178] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0179] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A display device, characterized in that: It comprises a display panel and a grating structure arranged on the light-emitting side of the display panel, wherein the grating structure comprises: A first grating layer, disposed on the light-emitting side of the display panel, the first grating layer comprising a plurality of lens units arranged in an array; a second grating layer, arranged on a side of the first grating layer away from the display panel, covering the lens units on the first grating layer, wherein a surface of the second grating layer on a side away from the first grating layer is a continuous plane, and a refractive index of the first grating layer is greater than a refractive index of the second grating layer; A shading layer, wherein the orthographic projection of the shading layer on the display panel along a first direction at least partially covers the orthographic projection of the spacing area between adjacent lens units on the display panel along the first direction, and the first direction is the direction from the second grating layer to the first grating layer.

2. The display device according to claim 1, characterized in that The light shielding layer is disposed on the light exiting side of the display panel, the light shielding layer is located in the spacing area between adjacent lens units, and the size of the light shielding layer along the first direction is smaller than the maximum size of the lens unit along the first direction.

3. The display device according to claim 2, characterized in that: A size of the light shielding layer along the first direction is one fiftieth to one tenth of a maximum size of the lens unit along the first direction.

4. The display device according to claim 1, characterized in that The light shielding layer is arranged on a side of the second grating layer away from the first grating layer, and a size of the light shielding layer along the first direction is smaller than a minimum size of the second grating layer along the first direction.

5. The display device according to claim 4, characterized in that: The size of the light shielding layer along the first direction is one fiftieth to one tenth of the minimum size of the second grating layer along the first direction.

6. A display device, characterized in that: It comprises a display panel and a grating structure arranged on the light-emitting side of the display panel, wherein the grating structure comprises: A first grating layer is arranged on the surface of the light-emitting side of the display panel, the first grating layer includes a planarization layer covering the display panel and a plurality of lens units arranged in an array and located on a side of the planarization layer away from the display panel, the surface of the planarization layer away from the lens units is a continuous plane, and the planarization layer and the lens units are made of the same material; The second grating layer is arranged on a side of the first grating layer away from the display panel, covering the lens unit on the first grating layer, the surface of the second grating layer away from the first grating layer is a continuous plane, and the refractive index of the first grating layer is greater than the refractive index of the second grating layer.

7. The display device according to claim 6, characterized in that: The plurality of lens units and the planarization layer are relatively independent structures; Alternatively, the plurality of lens units are integrally formed with the planarization layer.

8. A display device, characterized in that: It comprises a display panel and a grating structure arranged on the light-emitting side of the display panel, wherein: The grating structure includes a first grating layer and a second grating layer; the first grating layer includes a plurality of The lens units are arranged in an array, and the convex surface of the lens units faces the light exit side of the display panel; the second grating layer is located between the first grating layer and the display panel, the second grating layer covers the lens units on the first grating layer, the surface of the second grating layer away from the first grating layer is a continuous plane, and the refractive index of the first grating layer is greater than the refractive index of the second grating layer; The display device also includes a shading layer, which is located on the light-emitting side of the display panel. The orthographic projection of the shading layer on the display panel along a first direction at least partially covers the orthographic projection of the spacing area between adjacent lens units on the display panel along the first direction. The first direction is the direction from the second grating layer to the first grating layer.

9. A method for preparing a display device, characterized in that: include: forming a display panel; A grating structure is formed on the display panel, wherein the grating structure comprises a first grating layer and a second grating layer sequentially stacked on the display panel, the first grating layer comprises a plurality of lens units arranged in an array, the second grating layer covers the lens units on the first grating layer, a surface of the second grating layer on a side away from the first grating layer is a continuous plane, and a refractive index of the first grating layer is greater than a refractive index of the second grating layer; the grating structure further comprises a light shielding layer, an orthographic projection of the light shielding layer on the display panel along a first direction at least partially covers an orthographic projection of a spacing area between adjacent lens units on the display panel along the first direction, and the first direction is a direction from the second grating layer to the first grating layer.

10. The method for manufacturing a display device according to claim 9, characterized in that: The forming of a grating structure on the display panel comprises: forming an alignment mark on the display panel; forming a light shielding layer on the display panel according to the alignment mark, wherein the light shielding layer comprises a plurality of light shielding blocks distributed at intervals; forming the lens unit in the interval between adjacent light shielding blocks; The second grating layer is covered on the lens unit and the light shielding block.

11. The method for manufacturing a display device according to claim 10, characterized in that: The step of forming the lens unit in the interval between the adjacent light shielding blocks comprises: forming a first photosensitive material layer in the intervals between adjacent light-shielding blocks; Performing patterning on the first photosensitive material layer to form a grating transition pattern; Performing ultraviolet light exposure treatment on the grating transition pattern; The grating transition pattern is subjected to a low temperature thermal reflow treatment at a temperature of 150° C. or below to form a plurality of lens units arranged in an array.

12. The method for manufacturing a display device according to claim 9, characterized in that: The forming of a grating structure on the display panel comprises: providing a lens substrate; forming at least one alignment mark on the lens substrate; Forming a plurality of light shielding blocks arranged in an array on the lens substrate according to the alignment marks; forming the lens unit in the interval between adjacent light shielding blocks; Covering the lens unit and the light shielding block with the second grating layer to obtain the grating structure; The grating structure is located between the side close to the lens substrate and the light emitting side of the display panel. Fit.

13. The method for manufacturing a display device according to claim 9, characterized in that: The forming of a grating structure on the display panel comprises: providing a lens substrate; Forming the lens units arranged in an array and at least one alignment mark on the lens substrate; Covering the second grating layer on the lens unit and the alignment mark; forming a light shielding layer on a side of the second grating layer away from the lens unit to obtain the grating structure; The side of the grating structure close to the lens substrate is bonded to the light emitting side of the display panel.

14. The method for manufacturing a display device according to claim 13, characterized in that: The lens units and at least one alignment mark arranged in an array on the lens substrate include: Providing a first imprint template, the first imprint template comprising a substrate and a plurality of lens units arranged in an array and at least one alignment mark disposed on the substrate; Coating an imprinting material on a side of the first imprinting template close to the lens unit, so that the imprinting material forms a second imprinting template; forming a second photosensitive material layer on the lens substrate; The second photosensitive material layer on the lens substrate is subjected to a molding process using the second imprint template to form the lens units arranged in an array and at least one alignment mark, and then the mold is released.

15. A method for preparing a display device, characterized in that: include: forming a display panel; A grating structure is formed on the display panel, wherein the grating structure includes a first grating layer and a second grating layer sequentially stacked on the display panel, the first grating layer includes a planarization layer covering the display panel and a plurality of lens units arranged in an array on a side of the planarization layer away from the display panel, a surface of the planarization layer on a side away from the lens units is a continuous plane, and the planarization layer and the lens units are made of the same material; the second grating layer covers the lens units on the first grating layer, a surface of the second grating layer on a side away from the first grating layer is a continuous plane, and a refractive index of the first grating layer is greater than a refractive index of the second grating layer.

16. The method for manufacturing a display device according to claim 15, characterized in that: The forming of a grating structure on the display panel comprises: providing a lens substrate; forming at least one alignment mark on the lens substrate; forming the second grating layer on the lens substrate according to the alignment mark; forming the first grating layer on a side of the second grating layer away from the lens substrate to obtain the grating structure; The side of the grating structure close to the first grating layer is bonded to the light emitting side of the display panel.

17. The method for manufacturing a display device according to claim 16, characterized in that: The forming the second grating layer on the lens substrate according to the alignment mark comprises: A third imprint template is provided, wherein the third imprint template comprises a substrate and a A plurality of lens units arranged in an array and at least one alignment mark; forming a third photosensitive material layer on the lens substrate; The third photosensitive material layer on the lens substrate is subjected to a molding process using the third imprint template to form the second grating layer, and then demolding is performed.

18. A method for preparing a display device, characterized in that: include: forming a display panel; forming a light shielding layer and at least one alignment mark on the light exiting side of the display panel; A grating structure is formed on a side of the light-shielding layer away from the display panel, the grating structure comprising a first grating layer and a second grating layer; the first grating layer comprises a plurality of lens units arranged in an array, and a convex surface of the lens unit faces a light-emitting side of the display panel; the second grating layer is located between the first grating layer and the display panel, the second grating layer covers the lens units on the first grating layer, a surface of the second grating layer away from the first grating layer is a continuous plane, and a refractive index of the first grating layer is greater than a refractive index of the second grating layer.

19. The method for manufacturing a display device according to claim 18, characterized in that: The forming of a grating structure on a side of the light shielding layer away from the display panel comprises: providing a lens substrate; Forming the lens units arranged in an array and at least one alignment mark on the lens substrate; Covering the second grating layer on the lens unit and the alignment mark to obtain the grating structure; A side of the grating structure close to the second grating layer is bonded to a side of the light shielding layer away from the display panel.

Images