Optical waveguide based holographic grating color cast compensation system and head-mounted display equipment

Abstract

The invention discloses an optical waveguide based holographic grating color cast compensation system and head-mounted display equipment. The optical waveguide based holographic grating color cast compensation system comprises a coupled-in holographic grating, a coupled-in color cast compensation structure, a coupled-out holographic grating and a coupled-out color cast compensation structure; thecoupled-in holographic grating is arranged on the upper surface or the lower surface of the coupled-in end of the optical waveguide; the coupled-in holographic grating has a coupled-in color cast viewfield angle that color cast of diffracted light occurs; the view field is generally in an edge view field, but not limited to the edge view field; the coupled-in color cast compensation structure hasa first compensation centre view field angle; the coupled-out holographic grating is arranged on the upper surface or the lower surface of the coupled-out end of the optical waveguide; the coupled-out holographic grating has a coupled-out color cast view field angle that color cast of diffracted light occurs; the coupled-out color cast compensation structure has a second compensation centre viewfield angle; the angle range of the first compensation centre view field angle comprises a coupled-in color cast view field angle; and the angle range of the second compensation centre view field angle comprises a coupled-out color cast view field angle. According to the optical waveguide based holographic grating color cast compensation system provided by the invention, the light diffraction efficiency of the color cast view field can be effectively increased; and the color cast condition is reduced.

Description

technical field [0001] The present invention relates to the technical field of holographic waveguide display, in particular to an optical waveguide-based holographic grating color cast compensation system and a head-mounted display device. Background technique [0002] As a kind of diffractive optical element, due to its own characteristics, the diffraction efficiency of light of different wavelengths and different incident angles is different. When using a grating as a display element, due to the different light diffraction efficiency, color cast appears in the edge area of ​​the display imaging field of view. phenomenon, resulting in poor overall display effect. Contents of the invention [0003] Based on this, in order to solve the problem of color cast in the peripheral field of view when the grating is used as a display element in the traditional way, which leads to the deterioration of the overall display effect, it is necessary to provide a holographic grating color...

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Problems solved by technology

[0003] Based on this, in order to solve the problem of color cast in the peripheral field of view when the grating is used as a display element in the traditional way, which leads to the deterioration of the overall display effect, it is necessary to provide a holographic grating color cast compensation system based on an optical waveguide and a head-mounted display. The device can effectively reduce the problem of color cast in the edge area of ​​the field of view where the grating is used as a display element

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