A binocular waveguide display method based on reflective polarization multiplexing liquid crystal lens
A liquid crystal lens, polarization multiplexing technology, applied in the field of near-eye waveguide display, can solve the problem that the waveguide display system needs to use additional collimating lens and so on
Active Publication Date: 2022-08-09
ZHEJIANG UNIV
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[0008] The purpose of the present invention is to provide a binocular waveguide display method based on a reflective polarization multiplexing liquid crystal lens, which can solve the problem that an additional collimating lens needs to be used in the waveguide display system
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[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and embodiments.
[0032] like figure 1 As shown, it is a schematic diagram of waveguide beam transmission based on reflective polarization multiplexing liquid crystal lens. Coupling gratings PVG-L, PVG-R (both are liquid crystal polarizer gratings). The image source is placed on the focal plane of the in-coupling lens, so the divergent light emitted from different points on the image source will be collimated into parallel light at different angles by the in-coupling lens, and the in-coupling lens also has the function of a grating, multiplexed PVL -L and PVL-R respond to left-handed circularly polarized light and right-handed circularly polarized light, respectively, diffracting them into two propagation directions in the waveguide at larger angles, and th...
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The invention discloses a binocular waveguide display method based on a reflective polarization multiplexing liquid crystal lens. The method is based on a waveguide display device, comprising an optical waveguide plate, and an in-coupling liquid crystal lens and a right-handed waveguide are arranged on the same side of the optical waveguide plate. an out-coupling grating and a left-hand out-coupling grating, and the in-coupling liquid crystal lens is located between the right-hand out-coupling grating and the left-hand out-coupling grating; the method includes: placing an image source on a focal plane of the in-coupling liquid crystal lens, and the in-coupling liquid crystal lens puts the The two circularly polarized lights from the image source are collimated and coupled into the optical waveguide plate; the left-handed circularly polarized light and the right-handed circularly polarized light propagate in opposite directions in the waveguide plate by total reflection; After unscrewing the coupling grating, it is diffractively coupled out of the waveguide. The method solves the problem that a collimating lens needs to be used in the traditional near-eye waveguide display system and there is a gap between the collimating lens and the waveguide plate.
Description
technical field [0001] The invention belongs to the technical field of near-eye waveguide display, and in particular relates to a binocular waveguide display method based on a reflective polarization multiplexing liquid crystal lens. Background technique [0002] Augmented Reality (AR) technology is now widely used in entertainment, education, medical surgery, and engineering. By overlaying real environments with computer-generated imagery, AR, as an information platform, is revolutionizing viewers and displays interaction between them. [0003] As a widely recognized AR solution, waveguide augmented reality display devices have certain potential and advantages in terms of volume, weight, exit pupil size and visibility. However, in the traditional waveguide display technology, whether free-form surface, holographic grating or liquid crystal grating is used as the coupling device, a collimating lens needs to be used after the image source to convert the light emitted from di...
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IPC IPC(8): G02B27/01
CPCG02B27/0172G02B2027/0123
Inventor 李海峰翁嘉承罗豪刘旭
Owner ZHEJIANG UNIV