A kind of light diffraction device and its preparation method and three-dimensional display device
A technology of light diffraction and manufacturing method, which is applied in the direction of exposure devices, optical elements, and optomechanical equipment in the photolithography process, and can solve the problem of limiting the resolution, contrast and field angle of structured light images, and making it difficult to fully demonstrate the advantages of diffractive structured light and other issues to achieve the effect of low cost, high contrast and high resolution
Active Publication Date: 2019-04-05
SVG TECH GRP CO LTD +1
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Problems solved by technology
So far, in structured light applications represented by kinect depth cameras, the size of the diffraction unit of the structured light diffraction element can only be limited to the order of microns, which greatly limits the resolution, contrast, and field of view of the structured light image. Difficult to fully demonstrate the advantages of diffractive structured light
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[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0042] A method for manufacturing a light diffraction device, comprising the steps of:
[0043] s1, use the fast Fourier transform algorithm of laser diffraction (or other Fourier transform algorithms) to calculate the second-order spectrum bitmap of random speckle; as figure 1 with figure 2 shown.
[0044] s2, processing the second-order spectral bitmap topography features onto the surface of the transparent substrate to form a phase-type diffractive optical el...
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The invention discloses a nanoscale structured light diffraction device based on random laser speckle. The diffraction structural unit of the structured light diffraction device is only hundreds of nanometers, or even tens of nanometers, and has the advantages of high resolution, high contrast and large viewing angle. On this basis, the present invention also proposes a fabrication method of a nanoscale diffraction device, that is, a phase light field interference photolithography method. Using this method, high-quality depth-sensing structured light diffraction devices can be prepared. Compared with the traditional optical element processing technology, the phase light field interference lithography method proposed by the present invention has the advantages of high resolution and high phase matching accuracy. Compared with lithography technologies such as ultraviolet projection exposure and electron beam direct writing, the present invention The proposed photolithography technique has the advantages of high speed and low cost.
Description
technical field [0001] The present invention relates to the technical field of display devices, and more specifically, to a depth-sensing-oriented light diffraction device, a preparation method thereof, and a three-dimensional display device. Background technique [0002] Vision is the most direct way for humans to observe and recognize the world. With the continuous improvement of human pursuit, how to make machines or smart devices have 3D visual perception capabilities similar to human eyes, so as to realize the natural interaction between humans and machines, and the network world The virtual interaction between machines, and even the interaction between machines has become a hot spot in technology nowadays. The prerequisite for human-computer interaction is that the machine or smart device can create a three-dimensional image of the real scene, which requires the machine or smart device to sense the depth of the real scene and obtain the depth information of the real sc...
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IPC IPC(8): G02B27/42G02B27/46G02B27/22G03F7/20G02B30/00
CPCG02B27/42G02B27/46G03F7/70158G03F7/70408
Inventor 邵仁锦浦东林朱鹏飞张瑾朱鸣陈林森
Owner SVG TECH GRP CO LTD