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Full-color waveguide coupling near-to-eye display structure based on color polarizer grating, preparation method and AR wearable device

A near-eye display and waveguide structure technology, applied in the direction of diffraction grating, optics, optical components, etc., can solve the problems of small field of view, unfavorable full-color transmission, low diffraction efficiency, etc., and achieve large field of view and high grating diffraction efficiency Effect

Pending Publication Date: 2019-06-21
SOUTHEAST UNIV
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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention proposes a preparation method of a full-color waveguide-coupled near-eye display system based on a color polarizing volume grating (CPVG), which is used to solve the problems of low diffraction efficiency and small field of view existing in the existing methods , Not conducive to the realization of full-color transmission and other issues

Method used

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  • Full-color waveguide coupling near-to-eye display structure based on color polarizer grating, preparation method and AR wearable device
  • Full-color waveguide coupling near-to-eye display structure based on color polarizer grating, preparation method and AR wearable device
  • Full-color waveguide coupling near-to-eye display structure based on color polarizer grating, preparation method and AR wearable device

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] The structure of the CPVG used as the coupling device in the present invention is as follows figure 1 shown. Depend on figure 1 It can be seen that the volume holographic grating PVG has a two-dimensional periodic structure, where,

[0041] In the x-z plane (horizontal plane), the angle α between the optical axis of the liquid crystal molecules and the z-axis will change periodically along the x direction, that is, the horizontal direction, and its period length is recorded as Λ x .

[0042] On the y-z plane, the liquid crystal material (or more generally, the birefringent material) presents a periodic helical structure in the y direction, that is, the vertical direction, and its period is recorded as Λ y .

[0043] Such a two-dimensional periodic structure can produce a series of tilted periodic refractive index planes whose tilt angle It can be calculated...

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Abstract

The invention discloses a full-color waveguide coupling near-to-eye display structure based on a color polarizer grating, a preparation method and an AR wearable device. According to the invention, the color polarizer holographic grating is used as a coupling device of the waveguide, compared with the existing holographic grating, the novel grating has high diffraction efficiency and large diffraction angle by utilizing the self-assembly effect and anisotropy of liquid crystals, can work at a relatively wide wavelength and angle bandwidth, is applied to near-to-eye display application in combination with a disclosed multilayer waveguide structure, and can realize large-field-angle, high-transparency and high-efficiency color image transmission.

Description

technical field [0001] The invention relates to a full-color waveguide coupling near-eye display structure based on a color polarizer grating, a preparation method and an AR wearable device. Background technique [0002] Near-eye display systems based on planar waveguides with coupling elements have developed greatly in the past decade and are widely used in military and commercial fields. In AR devices, the above-mentioned waveguide structure must meet the characteristics of light weight, small size, high transparency and wide exit pupil. As one of the basic components of the coupled waveguide near-eye display system, the coupling element can determine important parameters such as field of view (FOV), coupling efficiency, and color rendering. [0003] To further lighten the waveguide structure, optical diffractive elements (DOEs) have been extensively studied and used as coupling elements in waveguide near-eye display systems. Among such multiple diffraction elements, opt...

Claims

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Application Information

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IPC IPC(8): G02B27/01G02F1/13
CPCG02B27/01G02F1/13G02B5/18
Inventor 张宇宁翁一士崔静怡刘奡沈忠文李晓华王保平
Owner SOUTHEAST UNIV
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