CN-122018173-A - Liquid crystal plane photon device, preparation method thereof and display device

CN122018173ACN 122018173 ACN122018173 ACN 122018173ACN-122018173-A

Abstract

The application provides a liquid crystal plane photon device, a preparation method thereof and a display device. The liquid crystal plane photon device is configured to form diffracted light under the irradiation of incident light, the diffracted light is converged to form at least one observation area, each observation area jointly forms an observation window of the liquid crystal plane photon device, the liquid crystal plane photon device is provided with a flat pixelated polarization grating array, the preparation method comprises the steps of obtaining first position distribution of each observation area, obtaining second position distribution of each pixelated polarization grating in the pixelated polarization grating array, encoding each pixelated polarization grating according to the first position distribution and the second position distribution to obtain corresponding target grating patterns, and forming the pixelated polarization grating array on a substrate according to the second position distribution and each target grating pattern. The preparation method can realize the mixed coding display of the multi-view images with higher precision and improve the diffraction efficiency.

Inventors

XIA ZHONGWEN
HUA JIANYU
QIAO WEN
CHEN LINSEN

Assignees

苏州苏大维格科技集团股份有限公司
苏州大学
苏州迈塔光电科技有限公司
苏州维业达科技有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (13)

1. A method for preparing a liquid crystal planar photonic device is characterized in that, The liquid crystal planar photonic device is configured to form diffracted light upon illumination by incident light, the diffracted light converging to form at least one viewing area, each of the viewing areas collectively forming a viewing window for the liquid crystal planar photonic device, and The liquid crystal planar photonic device is provided with a pixelated polarization grating array; the method comprises the following steps: Acquiring a first position distribution of each observation area; acquiring second position distribution of each pixelated polarization grating in the pixelated polarization grating array; encoding each pixelated polarization grating according to the first position distribution and the second position distribution to obtain a corresponding target grating pattern; And forming the pixelated polarization grating array on the substrate according to the second position distribution and each target grating pattern.
2. The method of claim 1, wherein encoding each of the pixelated polarization gratings according to the first and second position distributions results in a corresponding target grating pattern, comprising: Acquiring the refractive index of the preparation material of the pixelated polarization grating; acquiring the incidence angle of the incident light ray to each pixelated polarization grating and the wavelength of the corresponding diffracted light ray; And determining the period and the orientation of the nano grating in each pixelated polarization grating according to the first position distribution, the second position distribution, the incident angle, the wavelength and the refractive index.
3. The method of claim 1 or 2, wherein at least one pixelated polarization grating has a red sub-pixel polarization grating, a green sub-pixel polarization grating, a blue sub-pixel polarization grating, and wherein the incident light rays are incident on the pixelated polarization grating to form red polarized diffracted light rays, green polarized diffracted light rays, blue polarized diffracted light rays, and converge to the same viewing area.
4. The method of claim 1 or 2, wherein the viewing window has one or more of a punctiform viewing area, a linear viewing area, a planar viewing area.
5. The method of claim 4, wherein at least two pixelated gratings have a red sub-pixel polarization grating, a green sub-pixel polarization grating, and a blue sub-pixel polarization grating, and the incident light rays are incident on the at least two pixelated gratings to form red polarized diffracted light rays, green polarized diffracted light rays, and blue polarized diffracted light rays, respectively, and are converged into at least two different shaped viewing areas, respectively.
6. A method according to claim 1 or 2, characterized in that the image display resolution in at least two viewing areas is different.
7. The method of claim 6, wherein the image display resolution in the middle viewing area is greater than the image display resolution in the edge viewing area.
8. The method of claim 6, wherein at least one pixelated polarization grating has a red sub-pixel polarization grating, a green sub-pixel polarization grating, a blue sub-pixel polarization grating, and wherein the incident light rays upon the pixelated polarization grating form red polarized diffracted light rays, green polarized diffracted light rays, blue polarized diffracted light rays, and converge to one of the at least two viewing areas.
9. The method of claim 1 or 2, wherein forming the pixelated polarization grating array on a substrate according to the second location distribution and each of the target grating patterns comprises: coating a photo-alignment material on a target surface of the substrate; Performing double-beam polarized interference exposure on the photo-alignment material according to the second position distribution and each target grating pattern to form a patterned photo-alignment material; The pixelated polarization grating array is formed on the target surface using the patterned photo-alignment material and a liquid crystal polymer.
10. The method of claim 9, wherein the forming the pixelated polarization grating array on the target surface using the patterned photo-alignment material and liquid crystal polymer comprises: Coating the liquid crystal polymer on the patterned photo-alignment material and the target surface and curing to form an initial pixellated polarization grating array; And if the thickness of the initial pixelized polarization grating array does not meet the half-wave condition, continuing to coat the liquid crystal polymer and solidifying the liquid crystal polymer to form an optimized pixelized polarization grating array until the thickness of the optimized pixelized polarization grating array meets the half-wave condition, so as to obtain the pixelized polarization grating array.
11. The method of claim 9, further comprising, after forming the pixelated polarization grating array on the target surface: and a cover plate is arranged on one side of the pixelated polarization grating array far away from the substrate, wherein the cover plate is configured to be matched with the substrate to modulate the birefringence of the liquid crystal polymer through applying voltage, so that the pixelated polarization grating array meets the half-wave condition.
12. A liquid crystal planar photonic device, characterized in that it is manufactured based on the method according to any one of claims 1 to 11.
13. A display device comprising the liquid crystal planar photonic device of claim 12.

Description

Liquid crystal plane photon device, preparation method thereof and display device Technical Field The invention relates to the technical field of display, in particular to a liquid crystal plane photonic device, a preparation method thereof and a display device. Background Vision is a source of important information in the human perception, understanding and changing world, with more than 80% of information acquired by humans being acquired by the eyes. Conventional screen display technology can only record the amplitude information of an image, while light has phase information in addition to the amplitude information. The 3D display can bring depth information of an image to an observer, can see the shielding relation of objects in the image, and the naked eye 3D display can enable the observer to watch 3D images and videos without any auxiliary equipment, so that the method has great application value in the fields of medical education, games, military, aviation and the like. The autostereoscopic 3D display technique is a technique that is currently evolving faster in naked eye 3D displays, the 3D light field information of the object is represented by projecting a plurality of two-dimensional parallax images in a narrow observation area, so that near continuous parallax change is formed, and the method has the characteristics of dynamics, color and large breadth. In the autostereoscopic display technique, a field of view modulation panel plays a crucial role. One type of technique employs a field of view modulation panel of periodic structure so that a periodic arrangement of viewing areas is created in the viewing area. However, the geometrical optical field modulation system has a limited beam modulation capability, is difficult to realize a large viewing area, is prone to crosstalk and ghosting, and cannot avoid visual fatigue. The second type is a diffraction optics-based method, wherein the emergent direction of light rays is regulated pixel by pixel, and vector light field display of a convergent view angle is realized. The method adopts diffraction elements such as gratings to modulate the view field, and the diffraction elements have strong beam regulation and control capability, but the diffraction efficiency is generally not high due to the characteristics of the diffraction elements, and the chromatic dispersion is serious. Disclosure of Invention Based on this, the present invention aims to provide an improved liquid crystal planar photonic device, a preparation method thereof and a display device, so as to solve at least one of the above problems. In a first aspect, the present application provides a method of fabricating a liquid crystal planar photonic device configured to form diffracted light under illumination of an incident light, the diffracted light converging to form at least one viewing area, each of the viewing areas collectively forming a viewing window for the liquid crystal planar photonic device; the method comprises the following steps: Acquiring a first position distribution of each observation area; acquiring second position distribution of each pixelated polarization grating in the pixelated polarization grating array; encoding each pixelated polarization grating according to the first position distribution and the second position distribution to obtain a corresponding target grating pattern; And forming the pixelated polarization grating array on the substrate according to the second position distribution and each target grating pattern. The preparation method of the liquid crystal planar photonic device realizes coordinate pixelated polarization grating coordinates (x, y), period lambda and orientation by determining the second position distribution of each pixelated polarization grating and the target grating pattern based on double-beam polarization interference exposureThe method is favorable for improving the diffraction efficiency of the liquid crystal plane photon device, avoiding light energy loss and solving the problem of backlight heat dissipation, and besides, the device obtained by the preparation method has a flattened pixelized polarization grating array, so that compared with a relief grating, the device is easier to store and transport and is easier to attach to a display screen. In one embodiment, the encoding each pixelated polarization grating according to the first position distribution and the second position distribution to obtain a corresponding target grating pattern includes obtaining a refractive index of a preparation material of the pixelated polarization grating, obtaining an incident angle of the incident light to each pixelated polarization grating and a wavelength of the corresponding diffracted light, and determining a period and an orientation of a nano grating in each pixelated polarization grating according to the first position distribution, the second position distribution, the incident angle, the wavelength and the refractive index