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Holographic waveguide display system with compact structure

A display system and holographic waveguide technology, applied in light guides, instruments, optics, etc., can solve problems such as pixel size inconsistency, image aberration, etc., achieve the effect of large system adjustable space, reduce image aberration, and reduce volume

Active Publication Date: 2021-05-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, reflective in-coupling optical elements are mostly used. The light entering the waveguide needs to be modulated by the reflective spatial light modulator, so it can only be obliquely incident on the surface of the modulator, resulting in inconsistent pixel sizes in the x and y directions, causing image aberrations The problem

Method used

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  • Holographic waveguide display system with compact structure
  • Holographic waveguide display system with compact structure
  • Holographic waveguide display system with compact structure

Examples

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Embodiment 1

[0032] Such as figure 1 , 2 As shown, the present invention provides a compact holographic waveguide display system, including: a light source 2, an optical waveguide 1, an in-coupling optical element 3, a reflective spatial light modulator 4, and an out-coupling optical element 5; The element 3 and the reflective spatial light modulator 4 are located on one side of the optical waveguide 1 , and the light source 2 is located on the other side of the optical waveguide 1 . The light emitted by the light source 2 is diffracted through the in-coupling optical element 3, and the diffracted light is modulated and reflected by the reflective spatial light modulator 4, and then directly enters the optical waveguide 1 through the in-coupling optical element 3, and inside the optical waveguide 1 Propagation by total internal reflection occurs, and the light is modulated by the out-coupling optical element 5 and then exported to the optical waveguide 1 and enters the human eye 6 .

[0...

Embodiment 2

[0045] The difference from Embodiment 1 above is that in Embodiment 2, the in-coupling optical element 3 uses a transmissive polarizer holographic grating 8 .

[0046] Specifically, the light source 2 is a collimated light source, which may be a collimated laser light source, an LED array light source, an OLED array light source, etc. In Embodiment 2, a collimated laser light source is used.

[0047] Specifically, the light source 2 may be a common light source, a left-handed circularly polarized light source or a right-handed circularly polarized light source, and a left-handed circularly polarized light source is used in Embodiment 2.

[0048] Specifically, the optical waveguide 1 may be a flat structure or a curved structure, etc., and a flat structure is used in this embodiment.

[0049] Specifically, the in-coupling optical element 3 is a transmissive in-coupling optical element with large-angle single-order diffraction characteristics, which may be a transmissive volume ...

Embodiment 3

[0060] The difference from the above-mentioned embodiment 2 is that in this embodiment 3, the in-coupling optical element 3 uses a transmissive PB grating 10 and a quarter-wave plate that will produce -1 order diffraction when the left-handed circularly polarized light is normal incident 12 combinations.

[0061] Specifically, in the third embodiment, a collimated laser light source is used.

[0062] Specifically, in the third embodiment, a slab waveguide structure is used.

[0063] Specifically, in this embodiment 3, the combination of the transmissive PB grating 10 and the quarter-wave plate 12 that will cause -1 order diffraction when the left-handed circularly polarized light is normal incident, the principle is as follows Figure 7 shown.

[0064] Similar to the transmissive polarizing volume holographic grating 8 that is sensitive to left-handed circularly polarized light, the transmissive PB grating 10 that undergoes -1st order diffraction when left-handed circularly ...

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Abstract

The invention discloses a holographic waveguide display system with a compact structure. The display system comprises a light source (2), an optical waveguide (1), an in-coupling optical element (3), a reflective spatial light modulator (4) and an out-coupling optical element (5), light rays emitted by the light source are diffracted through the in-coupling optical element, the diffracted light rays are modulated and reflected through the reflective spatial light modulator, enter the optical waveguide and are subjected to total internal reflection propagation in the optical waveguide, and the light rays are modulated through the out-coupling optical element and then are guided out of the optical waveguide to enter human eyes. Light rays emitted by the light source are diffracted through the in-coupling optical element, the diffracted light rays are modulated and reflected through the reflective spatial light modulator, enter the optical waveguide and are subjected to total internal reflection propagation in the optical waveguide, and the light rays are modulated through the out-coupling optical element and then are guided out of the optical waveguide to enter human eyes. According to the system, the size of the waveguide display system is greatly reduced, the aberration is reduced, and a larger system adjustable space is provided.

Description

technical field [0001] The invention relates to the field of waveguide display technology, in particular to a compact holographic waveguide display system. Background technique [0002] As a head-mounted display device, the head-mounted display sends optical signals to the user's eyes through different display components and optical designs, which can realize virtual reality (Virtual Reality, VR), augmented reality (Augmented Reality, AR) And other effects of different near-eye displays. The main structure of the head-mounted display with AR function includes a micro image source imaging system and an optical coupler. Since the current research results of the micro image source imaging system are good, the selection and research of the optical coupler is particularly important. Several existing optical couplers mainly include: beam splitting prism, free-form surface, optical waveguide, etc. As a head-mounted device worn for a long time, small size and light weight are ver...

Claims

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Application Information

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IPC IPC(8): G02B27/01G02B6/00
CPCG02B27/0172G02B27/0103G02B6/0026G02B6/0031
Inventor 陈艳夏军
Owner SOUTHEAST UNIV
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