Display device and preparation method thereof

Abstract

The invention provides a display device and a preparation method thereof. The display device comprises a display panel and a grating structure arranged on the light emitting side of the display panel, the grating structure comprises a first grating layer, a second grating layer and a shading layer, the first grating layer is arranged on the light emitting side of the display panel, and the first grating layer comprises a plurality of lens units arranged in an array; the second grating layer is arranged on the side, away from the display panel, of the first grating layer and covers the lens units on the first grating layer, the surface of the side, away from the first grating layer, of the second grating layer is a continuous plane, and the refractive index of the first grating layer is larger than that of the second grating layer; the orthographic projection of the shading layer on the display panel in the first direction at least partially covers the orthographic projection of the interval area between the adjacent lens units on the display panel in the first direction, and the first direction is the direction from the second grating layer to the first grating layer. The quality of a display image can be improved, so that the 3D display effect is improved.

Description

Technical Field

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

[0002] As we all know, the 2D (two-dimensional) displays we usually see cannot provide us with depth information like the real world. The key to our ability to discern depth (3D effect) is the position difference caused by the pupil distance of about 60mm between the two eyes of a person. The two images with "binocular parallax" become a pair of "stereoscopic image pairs", which produce a 3D effect after being fused by the visual cortex of the human brain.

[0003] 3D display is divided into naked-eye type and glasses type, among which naked-eye 3D display has attracted much attention. The 3D display effect is achieved specifically 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, the grating is directly used to focus multi-directional light, the grating is difficult to manufacture, and the display effect is poor. With the increasing demand of consumers, in order to improve the user experience, a display device and preparation method with better 3D effect and simpler manufacturing process are urgently needed. Summary of the invention

[0004] 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 the 3D display device in the related art.

[0005] The present application provides a display device, comprising a display panel and a grating structure arranged on a light-emitting side of the display panel, wherein the grating structure comprises a first grating layer, a second grating layer and a light shielding layer, wherein the first grating layer is arranged on the light-emitting side of the display panel, and the first grating layer comprises a plurality of lens units arranged in an array; the second grating layer is arranged on a side of the first grating layer away from the display panel, and 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; an orthographic projection of the light shielding layer on the display panel along a first direction at least partially covers an orthographic projection of an interval area between adjacent lens units on the display panel along the first direction, and the first direction is a direction in which the second grating layer points to the first grating layer.

[0006] According to the above embodiments, compared with the conventional technology that only uses a single grating structure to focus multi-directional light, the grating structure in the present application uses the first grating layer and the second grating layer to cooperate. On the one hand, the second grating layer can protect the lens unit 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 arch height of the lens can be. Therefore, the arch height of the lens in the first grating layer can be adjusted by adjusting the refractive index, the display device can be thinned, and the product aesthetics can be improved. In addition, the grating structure in the present application is provided with a light shielding layer between adjacent lens units perpendicular to the panel direction, which can reduce the light crosstalk between pixel units of different colors in the display panel, improve the quality of the displayed image, and thus improve the 3D display effect.

[0007] In one embodiment, the shading layer is disposed on the light exiting side of the display panel, the shading layer is located in the spacing area between adjacent lens units, and the dimension of the shading layer along the first direction is smaller than the maximum dimension of the lens unit along the first direction.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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 comprises 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 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 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 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.

[0012] In one embodiment, the plurality of lens units and the planarization layer are relatively independent structures;

[0013] In one embodiment, the plurality of lens units are integrally formed with the planarization layer.

[0014] 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, 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, and the convex surface of the lens unit faces the 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, 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 display device further comprises a shading layer, the shading layer is located on the light-emitting side of the display panel, and the orthographic projection of the shading layer on the display panel along a first direction at least partially covers the orthographic projection of the interval 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.

[0015] The present application also provides a method for preparing a display device, comprising:

[0016] forming a display panel;

[0017] 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.

[0018] In one embodiment, forming a grating structure on the display panel comprises:

[0019] forming an alignment mark on the display panel;

[0020] 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;

[0021] forming the lens unit in the interval between adjacent light shielding blocks;

[0022] The second grating layer is covered on the lens unit and the light shielding block.

[0023] In one embodiment, forming the lens unit in the interval between adjacent light shielding blocks comprises:

[0024] forming a first photosensitive material layer in the intervals between adjacent light-shielding blocks;

[0025] Performing patterning on the first photosensitive material layer to form a grating transition pattern;

[0026] Performing ultraviolet light exposure treatment on the grating transition pattern;

[0027] 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.

[0028] In one embodiment, forming a grating structure on the display panel comprises:

[0029] providing a lens substrate;

[0030] forming at least one alignment mark on the lens substrate;

[0031] Forming a plurality of light shielding blocks arranged in an array on the lens substrate according to the alignment marks;

[0032] forming the lens unit in the interval between adjacent light shielding blocks;

[0033] Covering the lens unit and the light shielding block with the second grating layer to obtain the grating structure;

[0034] The side of the grating structure close to the lens substrate is bonded to the light emitting side of the display panel.

[0035] In one embodiment, forming a grating structure on the display panel comprises:

[0036] providing a lens substrate;

[0037] Forming the lens units arranged in an array and at least one alignment mark on the lens substrate;

[0038] Covering the second grating layer on the lens unit and the alignment mark;

[0039] forming a light shielding layer on a side of the second grating layer away from the lens unit to obtain the grating structure;

[0040] The side of the grating structure close to the lens substrate is bonded to the light emitting side of the display panel.

[0041] In one embodiment, the lens units and at least one alignment mark arranged in an array on the lens substrate include:

[0042] 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;

[0043] 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;

[0044] forming a second photosensitive material layer on the lens substrate;

[0045] 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.

[0046] The present application also provides a method for preparing a display device, comprising:

[0047] forming a display panel;

[0048] 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.

[0049] In one embodiment, forming a grating structure on the display panel comprises:

[0050] providing a lens substrate;

[0051] forming at least one alignment mark on the lens substrate;

[0052] forming the second grating layer on the lens substrate according to the alignment mark;

[0053] forming the first grating layer on a side of the second grating layer away from the lens substrate to obtain the grating structure;

[0054] The side of the grating structure close to the first grating layer is bonded to the light emitting side of the display panel.

[0055] In one embodiment, forming the second grating layer on the lens substrate according to the alignment mark comprises:

[0056] 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;

[0057] forming a third photosensitive material layer on the lens substrate;

[0058] 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.

[0059] The present application also provides a method for preparing a display device, comprising:

[0060] forming a display panel;

[0061] forming a light shielding layer and at least one alignment mark on the light exiting side of the display panel;

[0062] 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.

[0063] In one embodiment, forming a grating structure on a side of the light shielding layer away from the display panel comprises:

[0064] providing a lens substrate;

[0065] Forming the lens units arranged in an array and at least one alignment mark on the lens substrate;

[0066] Covering the second grating layer on the lens unit and the alignment mark to obtain the grating structure;

[0067] 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.

[0068] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] 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.

[0070] Figure 1a to Figure 1f It is a schematic structural diagram of each step of a method for preparing a display device provided in an embodiment of the present application;

[0071] Figure 2a to Figure 2d It is a schematic structural diagram of each step of another method for preparing a display device provided in an embodiment of the present application;

[0072] Figure 3a to Figure 3d It is a schematic structural diagram of each step of another method for preparing a display device provided in an embodiment of the present application;

[0073] Figure 4a to Figure 4e The embodiment of this application provides Figure 3a A schematic structural diagram of each step of a method for preparing a display device in the steps;

[0074] Figure 5a to Figure 5c It is a schematic structural diagram of each step of another method for preparing a display device provided in an embodiment of the present application;

[0075] Figure 6a to Figure 6b The embodiment of this application provides Figure 5a A schematic structural diagram of each step of a method for preparing a display device in the steps;

[0076] Figure 7a to Figure 7e It is a schematic structural diagram of each step of another method for preparing a display device provided in an embodiment of the present application;

[0077] Figure 8 The figure shows a comparison of the preparation process results between the embodiment of the present application and the related technology.

[0078] In the figure: 1-display panel; 2-alignment mark; 3-shading 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

[0079] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0080] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0081] 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 another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0082] At present, 3D display in the field of display technology is divided into naked eye type and glasses type. At present, digital maskless lithography system has been used in 3D display devices to use micro-mirrors as spatial light modulators to replace the mask in traditional lithography to prepare 3D display devices. However, the grating is difficult to produce and the display effect is poor because it directly focuses multi-directional light through the grating.

[0083] The display device and the manufacturing method thereof provided in the present application are intended to solve the above technical problems of the related art.

[0084] The display panel and the display device in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features in the following embodiments can complement or be combined with each other.

[0085] A display device provided in an embodiment of the present invention may be a liquid crystal display (LCD), or may be other types of display devices such as an organic light-emitting diode (OLED) and a micro-light-emitting diode (Micro-LED).

[0086] The present application embodiment provides a display device, such as Figure 1f , Figure 2d and Figure 3dAs shown, it includes a display panel 1 and a grating structure arranged on the light-emitting side of the display panel 1, the grating structure includes 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 includes 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 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; 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 interval area between adjacent lens units 41 on the display panel 1 along the first direction x, and the first direction x is the direction from the second grating layer 5 to the first grating layer 4.

[0087] According to the above embodiments, compared with the conventional technology that only uses a single grating structure to focus multi-directional light, the grating structure in the present application uses the first grating layer 4 and the second grating layer 5 to cooperate with each other. On the one hand, the second grating layer 5 can protect the lens unit 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 arch height of the lens can be. Therefore, the arch height of the lens in the first grating layer 4 can be adjusted by adjusting the refractive index, and the display device can be thinned to improve the aesthetics of the product. In addition, the grating structure in the present application is provided with a shading layer 3 between adjacent lens units 41 perpendicular to the panel direction, which can reduce the light crosstalk between pixel units of different colors in the display panel 1, improve the quality of the displayed image, and thus improve the 3D display effect.

[0088] In some embodiments, Figure 1f and Figure 2d As shown, the shading layer 3 is arranged on the light exiting side of the display panel 1 , and 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.

[0089] It should be noted that the lens in the related art cannot achieve no gap between the lenses in the photolithography process. When a digital exposure machine is used to prepare a grating structure, the gap between the lenses is determined by the resolution of the digital exposure machine. The exposure machine in the related art has a gap of more than 2μm when preparing a grating structure, while the digital exposure machine can achieve 1μm or even 0.7μm, with a smaller gap and higher precision. Therefore, preferably, a digital exposure machine can be used for preparation. The spacing of the lenses prepared by the digital exposure machine is 0.7μm to 5μm.

[0090] In some embodiments, the size of the light shielding layer 3 along the first direction x is one-fiftieth to one-tenth of the maximum size 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, and prevents light leakage to avoid crosstalk between pixels of different colors. In one example, the size of the light shielding layer 3 along the first direction x is 1 μm, and the size of the lens unit 41 along the first direction x is 12 μm.

[0091] In some embodiments, Figure 3d As shown, the light shielding layer 3 is disposed on the 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 can prevent the light that is not completely direct from being blocked by the light shielding layer 3, thereby improving the light utilization rate.

[0092] In some embodiments, the size of the light shielding layer 3 along the first direction x is one-fiftieth to one-tenth of the minimum size of the second grating layer 5 along the first direction x. In one example, the size of the light shielding layer 3 along the first direction x is 1 μm, and the minimum size of the second grating layer 5 along the first direction x is 30 μm.

[0093] 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. Further, the dimension h2 of the lens unit 41 along the first direction x is 21-31 μm. Further, the diameter / height of the lens unit 41 is 2-9.

[0094] 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.

[0095] In some embodiments, the grating structure further includes a lens substrate 6, such as Figure 2d and Figure 3d As shown, the lens substrate 6 is located on a side of the first grating layer 4 close to the display panel 1 , and 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.

[0096] In some embodiments, the lens substrate 6 is made of a light-transmitting material.

[0097] In some embodiments, the lens unit 41 is a cylindrical lens or a spherical lens.

[0098] Based on the same inventive concept, the present application also provides a display device, such as Figure 5cAs shown, it includes a display panel 1 and a grating structure arranged on the light-emitting side of the display panel 1, the grating structure includes 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 includes a planarization layer 42 covering the display panel 1 and a plurality of lens units 41 arranged in an array and located on a side of the planarization layer 42 away from the display panel 1, the surface of the planarization layer 42 on a side 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, covers the lens units 41 on the first grating layer 4, the surface of the second grating layer 5 on a side 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.

[0099] In the grating structure of the present embodiment, since the first grating layer 4 includes a planarization layer 42 and a plurality of lens units 41 arranged in an array and located 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 unit 41, the parallel emitted light will converge after encountering the lens. Therefore, there is no need for a shading layer 3 to achieve non-interference of light between pixel units of different colors in the display panel 1, thereby ensuring a 3D display effect and improving display quality.

[0100] In some embodiments, the plurality of lens units 41 and the planarization layer 42 are relatively independent structures.

[0101] 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.

[0102] Based on the same inventive concept, the present application also provides a display device, such as Figure 7e As shown, it includes a display panel 1 and a grating structure arranged on the light-emitting side of the display panel 1, wherein:

[0103] 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, and the convex surface of the lens unit 41 faces the light exiting 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 the second grating layer 5 covers the lens units 41 on the first grating layer 4, and the surface of the second grating layer 5 on the side 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;

[0104] The display device also includes a shading layer 3, which is located on the light-emitting side of the display panel 1. The orthographic projection of the shading 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.

[0105] The convex surface of the lens in this embodiment faces the light-emitting side of the display panel 1. At the same time, the shading 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 embodiments.

[0106] Based on the same inventive concept, the present application also provides a method for preparing a display device, comprising the following steps:

[0107] Step 100: forming a display panel 1;

[0108] Step 200: forming a grating structure on the display panel 1, wherein the grating structure comprises a first grating layer 4 and a second grating layer 5 which are sequentially stacked on the display panel 1, the first grating layer 4 comprises a plurality of lens units 41 arranged in an array, the second grating layer 5 covers the lens units 41 on the first grating layer 4, the surface of the second grating layer 5 on a side 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; the grating structure further comprises a shading layer 3, the orthographic projection of the shading layer 3 along a first direction x on the display panel 1 at least partially covers the orthographic projection of the interval area between adjacent lens units 41 on the display panel 1 along the first direction x, and the first direction x is the direction from the second grating layer 5 to the first grating layer 4.

[0109] In some embodiments, step S200 includes the following steps:

[0110] Step 2110: Figure 1a As shown, an alignment mark 2 is formed on the display panel 1;

[0111] Step 2120: Figure 1b As shown, a light shielding layer 3 is formed on the display panel 1 according to the alignment mark 2, and the light shielding layer 3 includes a plurality of light shielding blocks distributed at intervals;

[0112] Step 2130: Figure 1c to Figure 1e As shown, a lens unit 41 is formed in the interval between adjacent light shielding blocks;

[0113] Step 2140: Figure 1f As shown, the second grating layer 5 covers the lens unit 41 and the light shielding block.

[0114] 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.

[0115] In some embodiments, step 2130 includes the following steps:

[0116] Step 2131: Figure 1c As shown, a first photosensitive material layer 01 is formed in the interval between adjacent light-shielding blocks;

[0117] Step 2132: Figure 1d As shown, the first photosensitive material layer 01 is patterned to form a grating transition pattern 02;

[0118] Step 2133: Figure 1e As shown, the grating transition pattern 02 is subjected to ultraviolet light exposure treatment;

[0119] Step 2134: Figure 1e As shown, the grating transition pattern 02 is subjected to low temperature thermal reflow treatment at a temperature of 150° C. or below to form a plurality of lens units 41 arranged in an array.

[0120] In this embodiment, the ultraviolet light exposure treatment (Bleaching) in step 2133 can effectively improve the transmittance of the first grating layer 4 so that the molecules in the coating material that affect the transmittance undergo a cross-linking reaction to form transparent molecules, thereby improving the transmittance of the coating material. Figure 8 As shown, 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 influence 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 display device as a whole. Therefore, in this embodiment, the use of low-temperature thermal reflow treatment at a temperature lower than 150°C (greater than or equal to 100°C) solves the problem that the lens production is not compatible with the equipment process of the flat panel display factory. Thereby, the efficiency of the preparation process can be improved, while improving the 3D display effect.

[0121] In some embodiments, Figure 1d As shown, 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 along the direction from close to the display panel 1 to away from the display panel 1.

[0122] In some embodiments, Figure 1dAs shown, the height h4 of the subunit is 0.5-0.9 μm, and the width x1 is 0.7-1 μm. It should be noted that in some embodiments, the number of subunits can be multiple subunits, and the thickness of the multiple subunits can be equal. Exemplarily, the number of subunits is 15, and the height of each subunit is 0.6 μm.

[0123] In some embodiments, the aperture deviation of the lens in the display device prepared by this embodiment is ≤±0.05um, TP ≤±1.5um, and rotation deviation ≤0.01°, which can prove the optimization effect of the preparation process of this embodiment.

[0124] In some embodiments, step S200 includes the following steps:

[0125] Step 2210: providing a lens substrate 6;

[0126] Step 2220: Figure 2a As shown, at least one alignment mark 2 is formed on the lens substrate 6;

[0127] Step 2230: Figure 2a As shown, a plurality of light shielding blocks arranged in an array are formed on the lens substrate 6 according to the alignment mark 2;

[0128] Step 2240: Figure 2b As shown, a lens unit 41 is formed in the interval between adjacent light shielding blocks;

[0129] Step 2250: Figure 2c As shown, the second grating layer 5 is covered on the lens unit 41 and the light shielding block to obtain a grating structure;

[0130] Step 2260: Figure 2d As shown, the side of the grating structure close to the lens substrate 6 is bonded to the light emitting side of the display panel 1 .

[0131] In the preparation method of this embodiment, a lens substrate 6 is added to prepare the grating structure separately and then bonded to the display panel 1. Although the complexity of the preparation process is increased, the temperature during the preparation of the grating structure is no longer limited, and high-temperature thermal reflow (150° C. and above, preferably 230° C.) or low-temperature thermal reflow (below 150° C.) can achieve the integration of the grating structure on the display panel 1. There are fewer restrictions on process conditions.

[0132] In some embodiments, step S200 includes the following steps:

[0133] Step 2310: providing a lens substrate 6;

[0134] Step 2320: Figure 3aAs shown, an array of lens units 41 and at least one alignment mark 2 are formed on a lens substrate 6;

[0135] Step 2330: Figure 3b As shown, the second grating layer 5 is covered on the lens unit 41 and the alignment mark 2;

[0136] Step 2340: Figure 3c As shown, 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;

[0137] Step 2350: Figure 3d As shown, the side of the grating structure close to the lens substrate 6 is bonded to the light emitting side of the display panel 1 .

[0138] 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-mentioned embodiments and will not be repeated here.

[0139] In some embodiments, step S2320 includes the following steps:

[0140] Step S2321: Figure 4a As shown, a first imprint template 8 is provided, and the first imprint template 8 includes 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;

[0141] Step S2322: Figure 4b~4c As shown, the embossing material is coated on one side of the first embossing template 8 close to the lens unit 41, so that the embossing material forms a second embossing template 9;

[0142] Step S2323: Figure 4d As shown, a second photosensitive material layer 03 is formed on the lens substrate 6;

[0143] Step S2324: Figure 4d~4e As shown, the second photosensitive material layer 03 on the lens substrate 6 is subjected to a stamping process using a second stamping template 9 to form an array of lens units 41 and at least one alignment mark 2, and then demolding is performed.

[0144] Due to the light diffraction phenomenon in traditional photolithography machines, it is necessary to carefully calculate the degree of deviation caused by the light diffraction during design, and then reversely deduce and design what kind of modification needs to be made to the template pattern to obtain the target pattern. In comparison, the nanoimprint technology provided in this embodiment uses a two-stage nanoimprint technology to achieve a high degree of pattern matching, reduce processing errors, improve the accuracy of the grating structure on the display panel 1, and enhance the 3D display effect.

[0145] Based on the same inventive concept, the present application also provides another method for preparing a display device, comprising the following steps:

[0146] Step 100 ′: forming a display panel 1;

[0147] Step 200': forming a grating structure on the display panel 1, wherein the grating structure comprises a first grating layer 4 and a second grating layer 5 which are sequentially stacked on the display panel 1, the first grating layer 4 comprises a planarization layer 42 covering the display panel 1 and a plurality of array-arranged 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 on a side 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 covers the lens units 41 on the first grating layer 4, the surface of the second grating layer 5 on a side 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.

[0148] In some embodiments, step 200' comprises the following steps:

[0149] Step 210': Figure 5a As shown, a lens substrate 6 is provided;

[0150] Step 220': Figure 5a As shown, at least one alignment mark 2 is formed on the lens substrate 6;

[0151] Step 230': Figure 5a As shown, a second grating layer 5 is formed on a lens substrate 6 according to the alignment mark 2;

[0152] Step 240': Figure 5b As shown, a first grating layer 4 is formed on a side of the second grating layer 5 away from the lens substrate 6 to obtain a grating structure;

[0153] Step 250': Figure 5c As shown, the side of the grating structure close to the first grating layer 4 is attached to the light emitting side of the display panel 1 .

[0154] In some embodiments, step 230' comprises the following steps:

[0155] Step 231': Figure 6a As shown, a third imprint template 10 is provided, and the third imprint template 10 includes 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;

[0156] Step 232': Figure 6a As shown, a third photosensitive material layer 04 is formed on the lens substrate 6;

[0157] Step 233': Figure 6a to Figure 6b As shown, the third photosensitive material layer 04 on the lens substrate 6 is subjected to a stamping process using a third stamping template 10 to form a second grating layer 5, and then demolding is performed.

[0158] In the present embodiment, a one-time nanoimprinting process is used to first form a second grating layer 5 with a depression, 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 avoid light leakage of the grating structure without the need for a shading layer 3. Therefore, the display effect of the display device can be improved while simplifying the process.

[0159] In some embodiments, step 240' comprises the following steps:

[0160] A fourth photosensitive material layer is formed on a side of the second grating layer 5 away from the lens substrate 6 , and a side of the fourth photosensitive material layer away from the second grating layer 5 is a continuous plane.

[0161] 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 focusing light.

[0162] Based on the same inventive concept, the present application also provides a method for preparing a display device, comprising the following steps:

[0163] Step 100": Figure 7a As shown, a display panel 1 is formed;

[0164] Step 200": Figure 7b As shown, a light shielding layer 3 and at least one alignment mark 2 are formed on the light exiting side of the display panel 1;

[0165] Step 300": Figure 7c to Figure 7e As shown, a grating structure is formed on the side of the light-shielding layer 3 away from the display panel 1, and 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, and the convex surface of the lens unit 41 faces 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 the second grating layer 5 covers the lens units 41 on the first grating layer 4, and 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.

[0166] In some embodiments, step 300" includes the following steps:

[0167] Step 310": Figure 7c As shown, a lens substrate 6 is provided;

[0168] Step 320": Figure 7cAs shown, an array of lens units 41 and at least one alignment mark 2 are formed on a lens substrate 6;

[0169] Step 330": Figure 7d As shown, the second grating layer 5 is covered on the lens unit 41 and the alignment mark 2 to obtain a grating structure;

[0170] Step 340": Figure 7e As shown, the side of the grating structure close to the second grating layer 5 is attached to the side of the light shielding layer 3 away from the display panel 1 .

[0171] This embodiment also uses nanoimprint technology, and the template selected is a processed close-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.

[0172] 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.), navigators, cockpit controls and / or displays, displays of camera views (e.g., displays of rear-view 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.

[0173] The above embodiments of the present application may complement each other if no conflict occurs.

[0174] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also 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 is 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 is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0175] The orientation or position relationship indicated by terms such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0176] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0177] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the disclosure disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.

[0178] It should be understood that the present application is not limited to the precise structures that have been 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 comprises a first grating layer and a second grating layer; the first grating layer comprises a plurality of lens units arranged in an array, and the convex surface of the lens unit 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 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 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 side of the grating structure close to the lens substrate is bonded to the light emitting side of the display panel.

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: 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; 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.

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