Achromatic waveguide display system based on holographic diffractive optical element

A diffractive optical element and display system technology, which is applied in the field of waveguide display systems, can solve problems such as inconvenient to wear and use, reduce the diffraction efficiency of waveguide display systems, increase the volume and weight of holographic waveguide systems, etc.

Active Publication Date: 2016-05-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the embedded optical prism greatly increases the volume and weight of the holographic waveguide system, which is not convenient for people to wear and use
[0005] Based on the above, the problem existing in the prior art is how to eliminate the its chromatic aberration

Method used

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  • Achromatic waveguide display system based on holographic diffractive optical element
  • Achromatic waveguide display system based on holographic diffractive optical element
  • Achromatic waveguide display system based on holographic diffractive optical element

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Embodiment Construction

[0015] The embodiments of the present invention will be described in further detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0016] This embodiment provides an achromatic waveguide display system based on a holographic diffractive optical element, including an input coupler, a waveguide, and an output coupler, wherein the input coupler is a transmissive planar holographic grating, and the output coupler is a volume Holographic grating, such as figure 1 Shown.

[0017] In this embodiment, the transmissive plane holographic grating is obtained through the interference of two plane waves. According to the basic theory of grating, during the recording process, the period of the obtained holographic grating can be expressed by formula (1):

[0018] d λ rec 2 sin θ rec 2 ( 1 )

[0019] d is the period of the ...

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Abstract

The invention relates to a waveguide display system for eliminating chromatic aberration and based on a holographic diffraction optical element. The waveguide display system comprises an input coupler, a waveguide and an output coupler. When color light is irradiated on a transmission-type plane grating serving as the input coupler after passing a collimating lens, the plane grating exerts the dispersion characteristic and disperses the light into the light waves in different colors, the light waves enter the waveguide by different angles, and then the light continues to be transmitted in the waveguide, and when the light is transmitted to a reflection-type volume grating serving as the output coupler, the light waves are modulated through the volume grating, the light waves in which dispersion occurs are reflected out of the waveguide in the same direction and enter the eyes of people, people can see color pictures with the eyes, and therefore the chromatic aberration can be eliminated. Meanwhile, according to the waveguide display system for eliminating chromatic aberration and based on the holographic diffraction optical element, the negative effects of reduction of diffraction efficiency, the increase of the size and the weight of the system and the like cannot be caused, and the waveguide display system can be widely applied to the field of display systems.

Description

Technical field [0001] The invention relates to a waveguide display system, in particular to an achromatic waveguide display system based on a holographic diffractive optical element. Background technique [0002] The traditional helmet display system uses a catadioptric lens, which is heavy and bulky, which is not conducive to being worn on the body; in contrast, the diffractive optical element is small in weight, small in size, simple and easy to process, reproducible, and inexpensive. Therefore, the application of the holographic diffractive optical element to the waveguide display system greatly reduces the size and weight of the display system. However, the holographic diffractive optical element has chromatic aberration. When the holographic diffractive optical element is applied to the waveguide display system, chromatic aberration will occur, which will directly affect the reproduction of the real color imaged. [0003] Shi Rui et al. published an article "Chromatic disper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/01G02B27/44
Inventor 刘娟张楠楠王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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