Waveguide type head-mounted display optical device

Abstract

The invention discloses a waveguide type head-mounted display optical device which at least comprises a display device and an optical waveguide sheet. A light-coupling input structure is arranged on the side end part, which is close to one side of an ear, of the optical waveguide sheet. The light-coupling input structure is opposite to the display device. An optical reflecting face is arranged on at least one side of the optical waveguide sheet. A zigzag V-groove-shaped micro structure array face is arranged on the outer side of the optical waveguide sheet. The zigzag V-groove-shaped micro structure array face can carry out reflection deflection on a transmitted light at a specific angle. The deflected light is output by transmitting the optical waveguide chip. In human eyes, an enlarged virtual image is in distant front of human eyes. The light is reflected only one time thereon. Reflected lights are in order. The beam of a transmitted image is orderly reflected and output to human eyes. Lights of some pixels are not missed among sawteeth. The complete image can be output through coupling. Image pixels are not disrupted in a transmission process.

Description

technical field [0001] The present invention relates to the technical field of display equipment, and more specifically, relates to an optical device of a waveguide type head-mounted display. Background technique [0002] With the rapid development and popularization of VR (virtual reality) and AR (augmented reality) display technologies in entertainment, medical, industrial, and military fields, the waveguide head-mounted display is thinner due to its optical waveguide (its thickness can be made Similar to ordinary spectacle lenses), it is relatively easy to obtain high-definition images with a large field of view, relatively easy to process, and light in weight. It has won wide favor in the industry and will become a development direction for a long time in the future. [0003] At present, the mainstream waveguide technologies for head-mounted displays are mainly divided into two types: holographic waveguides and semi-permeable film array waveguides. [0004] Among them, ...

AI Technical Summary

Problems solved by technology

The bad problem that is easy to cause is: there is an optical path difference of two waveguide thicknesses between the upper and lower waveguides. When the two colors of light are superimposed together, the image plane is likely to cause chromatic aberration of red and blue separation.

[0009] 2. Four holographic gratings are required on the left and right sides. The production efficiency is low, and the quality and yield control is difficult, resulting in high production costs, which is not conducive to mass production and application.

[0010] 3. The processing accuracy of holographic grating is very high, requiring extremely precise and complicated manufacturing technology, and it is difficult to control the consistency of production quality

[0011] 4. The holographic grating and the waveguide cannot be integrally formed, and a complex and precise assembly process is required to meet the production conditions. The red and blue light of the upper waveguide and the green light of the lower waveguide require very precise coincidence correction and very precise alignment to correct chromatic aberration

Therefore, the outcoupling surface 210 of this two-dimensional reflective surface structure array is relatively easy to form ghosting and stray light, resulting in blurred images on the display screen seen by the human eye.

[0018] Third, according to the structure shown in the US8189263 patent, combined with the reflective surface structure 220 at the coupling input end and the reflective surface structure 210 at the coupling output end, because the coupling input end is a reflective surface structure composed of equally spaced slopes and planes, it cannot completely transmit the The image light of the display screen reaches the coupling output end, and because the coupling output end is composed of a two-dimensional array of multiple reflective surface structures arranged at equal intervals, these discrete reflective surface structures are connected by planes, resulting in the image light at the coupling output end Unable to conduct orderly into human glasses

The overall light transmission solution composed of the two obviously has technical defects such as partial light transmission loss and low image resolution, which makes it impossible for users to fully see the images on the display screen

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