Single-layer waveguide display sheet based on liquid crystal polarizer grating and preparation method thereof
A technology for display sheets and volume gratings, applied in light guides, polarizing elements, diffraction gratings, etc., can solve the problems of light leakage scattering, thickness and weight reduction, etc.
Pending Publication Date: 2022-04-12
ZHEJIANG UNIV
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[0005] The purpose of the present invention is to provide a single-layer waveguide display sheet based on liquid crystal polarizer grating and its preparation method. The glass substrate is reduced from two pieces to one piece, so that the thickness and weight of the waveguide are greatly reduced, and the portability is improved. It solves the problem of light leakage scattering and excessive thickness at the edge of the glass, and improves the efficiency of light energy transmission
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[0023] In order to have a clearer understanding of the technical features, purpose and effects of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0024] Such as figure 1 Shown is a traditional PVG-based double-layer waveguide display structure, including glass substrate 1, in-coupling grating 2, out-coupling grating 3, in-coupling glass substrate 4, out-coupling glass substrate 5, in-coupling grating 2 and out-coupling The gratings 3 are all liquid crystal polarizer gratings. The in-coupling grating 2 couples the light beam into the optical waveguide, and makes the light beam undergo total internal reflection in the optical waveguide and transmits to the out-coupling grating 3. Eye. The in-coupling grating 2 and the out-coupling grating 3 are respectively prepared on two glass substrates (4, 5), and then the glass substrate prepared with the out-coupling grating and the in-coupling...
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The single-layer waveguide display piece comprises a single-layer glass substrate, an in-coupling grating and an out-coupling grating, the in-coupling grating and the out-coupling grating are directly arranged on the same side of the single-layer glass substrate, the in-coupling grating couples a light beam into an optical waveguide, and the light beam is subjected to internal total reflection in the optical waveguide to be transmitted to the out-coupling grating; the light is coupled and emitted at the out-coupling grating and enters the human eyes; the preparation method of the single-layer waveguide display sheet comprises the following steps: performing first exposure on the out / in coupling area of the glass substrate coated with the photo-alignment film, rotating the glass substrate by 180 degrees, performing second exposure on the in / out coupling area, and continuously spin-coating the liquid crystal polymer on the substrate subjected to two times of exposure to obtain the single-layer waveguide display sheet. According to the single-layer waveguide display sheet provided by the invention, the number of the glass substrates is reduced from two to one, so that the thickness and the weight of the waveguide are greatly reduced, the portability is improved, meanwhile, the problems of light leakage scattering and overlarge thickness at the edge of the glass are well solved, and the light energy transmission efficiency is improved.
Description
technical field [0001] The invention relates to the field of waveguide display technology, in particular to a method for preparing a single-layer waveguide display sheet based on a liquid crystal polarizer grating. Background technique [0002] Recently, the concept of "metaverse" (metaverse) has been popular, where meta means beyond and verse means universe, that is, the concept of "beyond universe": a virtual world that runs parallel to the real world, and people can socialize in it and work. Global technology giants Google, Facebook, Microsoft and other companies have laid out the metaverse, claiming that the metaverse will be the next stage of Internet development, and it represents the beautiful vision of human beings for future technological development and life. Augmented Reality (AR) technology, as the key technology of Metaverse, has achieved a lot of technical accumulation in recent years. New displays such as Google Glass, Microsoft HoloLens and Huawei VR Glass h...
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Login to View More IPC IPC(8): G02B6/124G02B5/30G02B5/18G02B27/00G02B27/01
Inventor 李海峰罗豪翁嘉承
Owner ZHEJIANG UNIV