Holographic waveguide displaying device

Abstract

The invention discloses a holographic waveguide displaying device which comprises the components of a multi-angle calibrating micro display device, a lens set, a planar waveguide, an in-coupling holographic optical diffraction element and an out-coupling holographic optical diffraction element. The in-coupling holographic optical diffraction element and the out-coupling holographic optical diffraction element form a telescope optical system. The picture of the micro display device is arranged at a certain position to human eyes and is projected to an upright amplified virtual image, thereby realizing a large visual field effect. Furthermore, through a holographic waveguide structure, the optical path of the traditional coaxial telescope optical system can be turned for entering the human eyes, thereby forming an off-axis optical system which can be used for a penetrating type headworn displaying. The holographic waveguide displaying device is based on a traditional telescope optical system principle; and through the holographic waveguide structure, a coaxial telescope system is turned to the off-axis optical system which is suitable for the penetrating type headworn displaying, thereby settling problems of small visual field and small exit pupil in a traditional holographic waveguide display device. The holographic waveguide displaying device has advantages of simple and compact optical structure, easy operation in preparing and processing, low cost, small weight, etc.

Description

technical field [0001] The invention belongs to the technical field of head-mounted displays, and in particular relates to a holographic waveguide display device. Background technique [0002] In recent years, many researchers have been studying a holographic waveguide structure. The input and output optical coupling elements of this structure are reflective volume holographic gratings with mirror symmetry. . The display principle of this structure is that the image emitted by the microdisplay is firstly collimated by the collimating optical system, then diffracted into the holographic waveguide through the in-coupling holographic grating, and finally coupled into the human eye through the output holographic grating. [0003] After research, the field of view of the holographic waveguide display configuration is mainly determined by the collimation optical system and the angular wavelength bandwidth of the volume holographic grating. However, the angle selectivity and wave...

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Problems solved by technology

In addition, Wu Yishi et al. from Shanghai Jiaotong University simulated a composite holographic grating structure to expand the diffraction angle bandwidth of the grating. The composite holographic grating package has five different grating periods and grating inclination angles. However, this scheme requires the preparation of the The refractive index modulation degree of the holographic recording material of the grating is very high, and the grating exposure process is very complicated

[0005] In the above several schemes, the input and output optical coupling elements are all reflective volume holographic gratings, and the field of view expansion effect is not ideal, and the design and process are relatively complicated.

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