阅读说明：本技术 一种集成成像的裸眼3d显示装置及其制备方法 (Integrated imaging naked eye 3D display device and preparation method thereof ) 是由 张永爱 王文雯 周雄图 吴朝兴 李诗尧 陈培崎 郭太良 严群 于 2021-10-09 设计创作，主要内容包括：本发明涉及一种集成成像的裸眼3D显示装置,包括柔性液晶盒、高分辨率显示模块和驱动模块；所述柔性液晶盒包括从上至下依次设置的上电极层、液晶层、和下电极层；所述上电极层包括从上至下依次设置上柔性基板、图形化电极、高阻层和第一取向层；所述下电极层包括从上至下依次设置的微透镜阵列、第二取向层、公共电极和下柔性基板；所述驱动模块与图形化电极和公共电极分别连接,可调控柔性液晶盒的景深；所述上、下柔性基板的曲率半径可控制装置的视场角；所述高分辨率显示模块与柔性液晶盒匹配并显示微单元图像。本发明实现集大视场角、大景深范围和高分辨率显示于一体的裸眼3D显示装置,有效解决了传统集成成像系统各参数之间相互制约的问题。(The invention relates to an integrated imaging naked eye 3D display device, which comprises a flexible liquid crystal box, a high-resolution display module and a driving module, wherein the flexible liquid crystal box is arranged on the front side of the display module; the flexible liquid crystal box comprises an upper electrode layer, a liquid crystal layer and a lower electrode layer which are sequentially arranged from top to bottom; the upper electrode layer comprises an upper flexible substrate, a patterned electrode, a high-resistance layer and a first orientation layer which are sequentially arranged from top to bottom; the lower electrode layer comprises a micro-lens array, a second orientation layer, a common electrode and a lower flexible substrate which are sequentially arranged from top to bottom; the driving module is respectively connected with the graphical electrode and the common electrode, and can regulate and control the depth of field of the flexible liquid crystal box; the curvature radius of the upper and lower flexible substrates can control the field angle of the device; the high resolution display module is matched to the flexible liquid crystal cell and displays microcell images. The invention realizes the naked eye 3D display device integrating the large field angle, the large field depth range and the high resolution display, and effectively solves the problem that the parameters of the traditional integrated imaging system are mutually restricted.)

1. An integrated imaging naked eye 3D display device comprises a flexible liquid crystal box, a high-resolution display module and a driving module; the flexible liquid crystal box comprises an upper electrode layer, a liquid crystal layer and a lower electrode layer which are sequentially arranged from top to bottom; the upper electrode layer comprises an upper flexible substrate, a patterned electrode, a high-resistance layer and a first orientation layer which are sequentially arranged from top to bottom; the lower electrode layer comprises a micro-lens array, a second orientation layer, a common electrode and a lower flexible substrate which are sequentially arranged from top to bottom; the driving module is respectively connected with the graphical electrode and the common electrode, and can regulate and control the depth of field of the flexible liquid crystal box; the field angle of the curvature radius control device of the upper and lower flexible substrates; the high resolution display module is matched to the flexible liquid crystal cell and displays microcell images.

2. An integrated imaging naked eye 3D display device according to claim 1, wherein the upper flexible substrate and the lower flexible substrate have a uniform radius of curvature.

3. An integrated imaging naked-eye 3D display device according to claim 1, wherein the display device is a digital image display device

The patterning electrode is made of non-transparent materials, the length and the width of the patterning electrode are between 40 mu m and 500 mu m, the distance between adjacent arrays is between 10 mu m and 100 mu m, and the shape of the patterning electrode is circular or regular polygon; the patterned electrode adopts a planar layer structure containing a hollow hole array, and the patterned electrode pattern of the planar layer structure is completely superposed with the micro-lens array on the common electrode.

4. The integrated imaging naked eye 3D display device according to claim 1, wherein the microlens array comprises two microlens arrays with different heights, the microlens arrays cover F rows by D columns of pixel units, the pixel units comprise two microlenses with different heights and spacers, and adjacent pixel units are separated by a black matrix.

5. The imaging-integrated naked-eye 3D display device according to claim 4, wherein the spacers are transparent spacers and have a height greater than the first microlens array and the second microlens array.

6. The integrated imaging naked eye 3D display device according to claim 4, wherein the black matrix is prepared by photoetching or silk screen printing, is composed of opaque metal or opaque photoresist with a hollow patterned array, and is positioned on one side of the common electrode.

7. The integrated imaging naked eye 3D display device according to claim 1, wherein the two microlens arrays with different heights on one side of the common electrode correspond to the small hole array small holes of the patterned electrode of the upper flexible substrate one by one, and the lens units are located in the corresponding small hole array small holes and completely coincide with the central axis of the patterned electrode.

The preparation method of the naked eye 3D display device integrated with imaging is characterized by comprising the following steps:

step S1: selecting an upper flexible substrate, and then manufacturing a surface electrode comprising P rows and Q columns of patterns on the surface of a first substrate by adopting a photoetching technology;

step S2: preparing a layer of transparent material on the patterned electrode surface prepared in the step S1 by adopting a spin coating process, forming an orientation layer film after plasma treatment, and forming a first orientation layer through rubbing orientation;

step S3: selecting a lower flexible substrate, scribing, cleaning and drying the lower flexible substrate, and manufacturing a planar electrode; preparing a layer of transparent material on one surface of the planar electrode by adopting a spin coating process, forming an orientation layer film after plasma treatment, and rubbing the orientation layer film along the opposite direction of the first orientation layer to form a second orientation layer;

step S4, preparing a micro-lens array on the planar electrode:

step S5, adopting a transparent insulator manufactured by powder spraying equipment on the surface of the first orientation layer of the patterned electrode, coating frame sealing glue on the periphery of the second orientation layer of the planar electrode by adopting a printing or ink-jet printing process, and reserving a crystal filling opening on the periphery of the frame sealing glue;

step S6, aligning the patterned electrode layer and the planar electrode layer in the opposite direction according to the first orientation layer and the second orientation layer, and forming a frame sealing body after the frame sealing glue is melted;

step S7, injecting liquid crystal molecules into the sealing frame body along the crystal injection port in the step S4 by using crystal injection equipment, and then sealing the crystal injection port, wherein the liquid crystal molecules form a liquid crystal layer between the circular hole-shaped electrode layer and the planar electrode layer;

step S8, after the liquid crystal is poured, curing glue is coated on the liquid crystal filling opening, the liquid crystal box is obtained after ultraviolet exposure and sealing,

the method for manufacturing an integrated imaging naked-eye 3D display device according to claim 7, wherein the step S4 specifically comprises:

s41: selecting the planar electrode prepared in the step S2, and spin-coating a first layer of positive photoresist on the surface of the planar electrode in a spin-coating manner;

s42: selecting a first mask with a light-transmitting pattern, and carrying out first exposure on the first layer of positive photoresist to obtain a first column of columnar arrays;

s43: spin-coating a second layer of positive photoresist on the surface of the planar electrode in a spin-coating mode, selecting a second mask with a light-transmitting pattern, and carrying out secondary exposure on the second layer of positive photoresist to obtain a second column of columnar array;

s44: after developing the positive photoresist region on the exposure substrate, only the first layer of positive photoresist is retained in the positive photoresist region covered by the primary exposure region, and the first layer of positive photoresist and the second layer of positive photoresist in the positive photoresist region covered by the secondary exposure region are both retained to form two photoresist columns with different thicknesses;

s45: two kinds of photoresist columns with different thicknesses prepared in step S44 are heated for a period of time to obtain two kinds of microlens arrays with different heights.

8. The method according to claim 7, wherein the micro-lens array is formed by a photoresist melting process, a laser etching process, a screen printing process or an ink-jet printing process, comprises a plurality of micro-lenses which are periodically arranged, and completely coincides with the central position of the hollow small hollow array on the patterning electrode.

Technical Field

The invention relates to the field of photoelectric display, in particular to an integrated imaging naked-eye 3D display device and a preparation method thereof.

Background

The traditional visual image can only be displayed in a plane mode as three-dimensional information, and the requirements of people are difficult to meet. With the continuous development of the technology in the real field, the naked eye display technology becomes a research hotspot in the three-dimensional real field. The integrated imaging naked eye 3D display technology is a true 3D stereo display technology for reproducing stereo images by using a lens array. The method has the advantages of no need of wearing any vision-aid equipment, no visual fatigue and the like, and becomes one of the mainstream developments of the naked-eye 3D display technology. However, the integrated imaging 3D display also has a problem that the viewing angle, the depth of field range, and the resolution cannot be simultaneously balanced.

Disclosure of Invention

In view of this, the present invention provides an integrated imaging naked-eye 3D display device and a manufacturing method thereof, so as to implement a naked-eye 3D display device integrating a large field angle, a large depth of field range and a high resolution display, and effectively solve the problem of mutual restriction between parameters of a conventional integrated imaging system.

In order to achieve the purpose, the invention adopts the following technical scheme:

an integrated imaging naked eye 3D display device comprises a flexible liquid crystal box, a high-resolution display module and a driving module; the flexible liquid crystal box comprises an upper electrode layer, a liquid crystal layer and a lower electrode layer which are sequentially arranged from top to bottom; the upper electrode layer comprises an upper flexible substrate, a patterned electrode, a high-resistance layer and a first orientation layer which are sequentially arranged from top to bottom; the lower electrode layer comprises a micro-lens array, a second orientation layer, a common electrode and a lower flexible substrate which are sequentially arranged from top to bottom; the driving module is respectively connected with the graphical electrode and the common electrode, and can regulate and control the depth of field of the flexible liquid crystal box; the curvature radius of the upper and lower flexible substrates can control the field angle of the device; the high resolution display module is matched to the flexible liquid crystal cell and displays microcell images.

Furthermore, the curvature radius of the upper flexible substrate is consistent with that of the lower flexible substrate, and the size of the curvature radius of the flexible substrate determines the size of the angle of view of the whole device.

Further, the patterned electrode is made of non-transparent materials, the length and the width of the patterned electrode are 40-500 mu m, the distance between adjacent arrays is 10-100 mu m, and the shape of the patterned electrode is circular or regular polygon;

the patterned electrode adopts a planar layer structure containing a hollow hole array, and the patterned electrode pattern of the planar layer structure is completely superposed with the micro-lens array on the common electrode.

Further, the microlens array comprises two types of microlens arrays with different heights, the microlens arrays cover F rows multiplied by D columns of pixel units, the pixel units comprise two types of microlenses with different heights and spacers, and adjacent pixel units are separated by black matrixes.

Furthermore, the insulator is a transparent insulator, and the height of the transparent insulator is greater than that of the first micro lens array and the second micro lens array.

Furthermore, the black matrix is prepared by photoetching or silk-screen printing, is composed of opaque metal or opaque photoresist with a hollow graphical array and is positioned on one side of the common electrode.

Furthermore, the two microlens arrays with different heights on one side of the common electrode correspond to the small hole array holes of the patterned electrode of the upper flexible substrate one by one, and the lens units are positioned in the corresponding small hole array holes and completely coincide with the central axis of the patterned electrode.

A preparation method of an integrated imaging naked eye 3D display device comprises the following steps:

step S1: selecting an upper flexible substrate, and then manufacturing a surface electrode comprising P rows and Q columns of patterns on the surface of a first substrate by adopting a photoetching technology;

step S2: preparing a layer of transparent material on the patterned electrode surface prepared in the step S1 by adopting a spin coating process, forming an orientation layer film after plasma treatment, and forming a first orientation layer through rubbing orientation;

step S3: selecting a lower flexible substrate, scribing, cleaning and drying the lower flexible substrate, and manufacturing a planar electrode; preparing a layer of transparent material on one surface of the planar electrode by adopting a spin coating process, forming an orientation layer film after plasma treatment, and rubbing the orientation layer film along the opposite direction of the first orientation layer to form a second orientation layer;

step S4, preparing a micro-lens array on the planar electrode:

step S5, adopting a transparent insulator manufactured by powder spraying equipment on the surface of the first orientation layer of the patterned electrode, coating frame sealing glue on the periphery of the second orientation layer of the planar electrode by adopting a printing or ink-jet printing process, and reserving a crystal filling opening on the periphery of the frame sealing glue;

step S6, aligning the patterned electrode layer and the planar electrode layer in the opposite direction according to the first orientation layer and the second orientation layer, and forming a frame sealing body after the frame sealing glue is melted;

step S7, injecting liquid crystal molecules into the sealing frame body along the crystal injection port in the step S4 by using crystal injection equipment, and then sealing the crystal injection port, wherein the liquid crystal molecules form a liquid crystal layer between the circular hole-shaped electrode layer and the planar electrode layer;

step S8, after the liquid crystal is poured, curing glue is coated on the liquid crystal filling opening, the liquid crystal box is obtained after ultraviolet exposure and sealing,

further, the step S4 is specifically:

s41: selecting the planar electrode prepared in the step S2, and spin-coating a first layer of positive photoresist on the surface of the planar electrode in a spin-coating manner;

s42: selecting a first mask with a light-transmitting pattern, and carrying out first exposure on the first layer of positive photoresist to obtain a first column of columnar arrays;

s43: spin-coating a second layer of positive photoresist on the surface of the planar electrode in a spin-coating mode, selecting a second mask with a light-transmitting pattern, and carrying out secondary exposure on the second layer of positive photoresist to obtain a second column of columnar array;

s44: after developing the positive photoresist region on the exposure substrate, only the first layer of positive photoresist is retained in the positive photoresist region covered by the primary exposure region, and the first layer of positive photoresist and the second layer of positive photoresist in the positive photoresist region covered by the secondary exposure region are both retained to form two photoresist columns with different thicknesses;

s45: two kinds of photoresist columns with different thicknesses prepared in step S44 are heated for a period of time to obtain two kinds of microlens arrays with different heights.

Furthermore, the micro-lens array can be prepared by adopting a photoresist melting, laser etching, screen printing or ink-jet printing process, consists of a plurality of micro-lenses which are periodically arranged, and is completely superposed with the central position of the hollow small hollow array on the patterning electrode.

Compared with the prior art, the invention has the following beneficial effects:

the invention realizes the naked eye 3D display device integrating the large field angle, the large field depth range and the high resolution display, and effectively solves the problem that the parameters of the traditional integrated imaging system are mutually restricted.

Drawings

FIG. 1 is a patterned electrode of an embodiment of the invention;

FIG. 2 shows a corresponding relationship between a patterned electrode and a pixel unit according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a corresponding relationship between a patterned electrode and a sub-pixel unit according to an embodiment of the present invention;

FIG. 4 is a diagram of the correspondence between the common electrode and the patterned electrode, the first microlens array, and the second microlens array according to the embodiment of the present invention;

FIG. 5 is a first reticle of an embodiment of the invention;

FIG. 6 is a second mask of an embodiment of the present invention;

FIG. 7 is a state of the display device according to the embodiment of the present invention in an ON state;

FIG. 8 is a state of the display device in an OFF state according to the embodiment of the present invention;

in the figure, 1 is an upper flexible substrate, 2 is a patterned electrode, 3 is a high resistance layer, 4 is a first alignment layer, 5 is liquid crystal molecules, 6 is a spacer, 7 is a first microlens array, 8 is a second microlens array, 9 is a black matrix, 10 is a second alignment layer, 11 is a common electrode, 12 is a lower flexible substrate, 13 is a high resolution display panel, 14, 15, 16 are sub-pixel points respectively, 17 is a sub-pixel point unit, and 18 is a pixel unit.

Detailed Description

The invention is further explained below with reference to the drawings and the embodiments.

The invention provides an integrated imaging naked eye 3D display device, which comprises a flexible liquid crystal box, a high-resolution display module and a driving module, wherein the flexible liquid crystal box is arranged on the front side of the display module; the flexible liquid crystal box comprises an upper electrode layer, a liquid crystal layer and a lower electrode layer which are sequentially arranged from top to bottom; the upper electrode layer comprises an upper flexible substrate, a patterned electrode, a high-resistance layer and a first orientation layer which are sequentially arranged from top to bottom; the lower electrode layer comprises a micro-lens array, a second orientation layer, a common electrode and a lower flexible substrate which are sequentially arranged from top to bottom; the driving module is respectively connected with the graphical electrode and the common electrode, and can regulate and control the depth of field of the flexible liquid crystal box; the curvature radius of the upper and lower flexible substrates can control the field angle of the device; the high resolution display module is matched to the flexible liquid crystal cell and displays microcell images.

In this embodiment, a method for manufacturing an integrated imaging naked-eye 3D display device is further provided, which includes the following steps:

step S1: selecting an upper flexible substrate, and then manufacturing a surface electrode comprising P rows and Q columns of patterns on the surface of a first substrate by adopting a photoetching technology;

step S2: preparing a layer of transparent material on the patterned electrode surface prepared in the step S1 by adopting a spin coating process, forming an orientation layer film after plasma treatment, and forming a first orientation layer through rubbing orientation;

step S3: selecting a lower flexible substrate, scribing, cleaning and drying the lower flexible substrate, and manufacturing a planar electrode; preparing a layer of transparent material on one surface of the planar electrode by adopting a spin coating process, forming an orientation layer film after plasma treatment, and rubbing the orientation layer film along the opposite direction of the first orientation layer to form a second orientation layer;

step S4, preparing a micro-lens array on the planar electrode, which comprises the following steps:

s41: selecting the planar electrode prepared in the step S2, and spin-coating a first layer of positive photoresist on the surface of the planar electrode in a spin-coating manner;

s42: selecting a first mask with a light-transmitting pattern, and carrying out first exposure on the first layer of positive photoresist to obtain a first column of columnar arrays;

s43: spin-coating a second layer of positive photoresist on the surface of the planar electrode in a spin-coating mode, selecting a second mask with a light-transmitting pattern, and carrying out secondary exposure on the second layer of positive photoresist to obtain a second column of columnar array;

in the present embodiment, the first columnar array includes bDF, and the second columnar array includes (m-a-b) DF, as shown in fig. 4;

s44: after developing the positive photoresist region on the exposure substrate, only the first layer of positive photoresist is retained in the positive photoresist region covered by the primary exposure region, and the first layer of positive photoresist and the second layer of positive photoresist in the positive photoresist region covered by the secondary exposure region are both retained to form two photoresist columns with different thicknesses;

s45: two kinds of photoresist columns with different thicknesses prepared in step S44 are heated for a period of time to obtain two kinds of microlens arrays with different heights.

Step S5, adopting a transparent insulator manufactured by powder spraying equipment on the surface of the first orientation layer of the patterned electrode, coating frame sealing glue on the periphery of the second orientation layer of the planar electrode by adopting a printing or ink-jet printing process, and reserving a crystal filling opening on the periphery of the frame sealing glue; the thickness of the frame sealing glue is 3-5 times of that of the insulator;

step S6, aligning the patterned electrode layer and the planar electrode layer in the opposite direction according to the first orientation layer and the second orientation layer, and forming a frame sealing body after the frame sealing glue is melted;

step S7, injecting liquid crystal molecules into the sealing frame body along the crystal injection port in the step S4 by using crystal injection equipment, and then sealing the crystal injection port, wherein the liquid crystal molecules form a liquid crystal layer between the circular hole-shaped electrode layer and the planar electrode layer;

step S8, after the liquid crystal is poured, curing glue is coated on the liquid crystal filling opening, the liquid crystal box is obtained after ultraviolet exposure and sealing,

preferably, in the embodiment, the patterning electrode is made of a non-transparent material, the length and the width of the patterning electrode are between 40 mu m and 500 mu m, the distance between adjacent arrays is between 10 mu m and 100 mu m, and the patterning electrode is in a circular shape or a regular polygon shape. The planar layer structure comprises a hollow hole array, a patterned electrode pattern of the planar layer structure is completely overlapped with a micro lens array on a common electrode, the electrode comprises P rows multiplied by Q columns, as shown in fig. 1, each m electrodes are regarded as a pixel unit, each pixel unit comprises n sub-pixel units, as shown in fig. 2 and 3, each sub-pixel unit comprises 3 sub-pixel points, and the whole display screen comprises F rows multiplied by D columns of pixel units, as shown in fig. 2.

Preferably, in this embodiment, the microlens array includes two types of microlens arrays with different heights, and covers F rows × D columns of pixel units in total, the pixel units include two types of microlenses with different heights and spacers, and adjacent pixel units are separated by a black matrix.

The spacers are transparent spacers, the transparent spacers are 40-100 mu m, the size of the spacers determines the box thickness of the whole liquid crystal box, and the height of the spacers is larger than that of the first micro lens array and that of the second micro lens array.

Preferably, in this embodiment, two kinds of microlens arrays with different heights on one side of the common electrode correspond to the small hole array holes of the patterned electrode of the upper flexible substrate one to one, the lens units are located in the corresponding small hole array holes and completely coincide with the central axis of the patterned electrode, and the height of the first microlens array is greater than the height of the second microlens array, as shown in fig. 4, the material of the exposure substrate is a flexible substrate including one of transparent PET or PMMA acrylic plates, preferably a flexible ITO transparent conductive substrate.

Preferably, in this embodiment, the microlens array may be prepared by processes such as photoresist melting, laser etching, screen printing, inkjet printing, and the like, and is composed of a plurality of periodically arranged microlenses, and completely coincides with the central position of the hollow small hollow array on the patterning electrode.

Preferably, in this embodiment, the first mask and the second mask have "cross" alignment marks around them, so that the patterns of the two photo-etching processes are completely overlapped, as shown in fig. 5 and 6.

Preferably, in this embodiment, the flexible liquid crystal cell may be bent according to a certain curvature radius, due to the flexible characteristic of the flexible substrate, the viewing angle of the entire integrated imaging device may be adjusted by changing the curvature radius of the flexible liquid crystal cell, the high-resolution display is used to display images of the micro-units, the switch of the liquid crystal cell is controlled by the driving module, as shown in fig. 7, the working state of the display device in the on state is shown, as shown in fig. 8, the working state of the display device in the off state is shown, the depth of field range of the entire display device may be further expanded by combining the two microlens arrays and liquid crystal molecules of different heights prepared on the common substrate, and thus, an integrated imaging 3D display device integrating large viewing angle, large depth of field range and high resolution display is realized.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.