Projection type planar waveguide helmet-mounted displayer

A helmet-mounted display and planar waveguide technology, applied in light guides, instruments, optics, etc., can solve the problems of large display size, reduce stray light, reduce design difficulty, and expand the observation field of view

Active Publication Date: 2014-06-25
BEIJING NEDPLUSAR DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a projection-type planar wavegu

Method used

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  • Projection type planar waveguide helmet-mounted displayer
  • Projection type planar waveguide helmet-mounted displayer
  • Projection type planar waveguide helmet-mounted displayer

Examples

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Example Embodiment

[0049] Example one

[0050] Such as figure 2 As shown, the structure of the planar waveguide in this embodiment is a rectangular waveguide structure, which specifically includes an optical coupling-in end 101 and an optical coupling-out end 102. The optical coupling-in end 101 of the planar waveguide is a mirror, and the optical coupling-out of the planar waveguide 102 is two or more half mirrors placed in parallel, and the angle between the half mirror and the reflective surface of the planar waveguide is greater than 15° and less than 40°.

[0051] In the first embodiment, a mirror is used to ensure that the light entering the planar waveguide meets the conditions for total reflection of the light in the planar waveguide after its reflection. The mirror is used as the optical coupling end to ensure the overall rectangular shape of the planar waveguide, which is convenient for installation. The light emitted from the display 1 enters the planar waveguide 3 after being imaged by t...

Example Embodiment

[0052] Example two

[0053] Such as image 3 As shown, the structure of the planar waveguide 3 in this embodiment is an irregular structure, and the reflection area where light enters the planar waveguide 3 for the first reflection is an inclined surface, which serves as the optical coupling end 201 of the planar waveguide 3, and the inclined surface The surface is coated with a reflective film, and the inclined surface needs to ensure that the light entering the planar waveguide meets the conditions for total reflection of the light in the planar waveguide after reflection. The use of this structure reduces the process of system gluing and is easy to process. After the incident light enters the planar waveguide 3 and reaches the optical coupling end 201, the light reflects and is restricted to propagate in the planar waveguide 3 and enters the planar waveguide 3. The optical path is the same as in the first embodiment.

Example Embodiment

[0054] Example three

[0055] Such as Figure 4 As shown, in this embodiment, the reflective surface where light enters the planar waveguide 3 for the first reflection is a holographic or diffractive surface, which serves as the optical coupling end 301 of the planar waveguide 3, and the holographic or diffractive surface is coated with optical holographic exposure The subsequent photosensitive coating may be formed by photolithography or other technologies to achieve light deflection with a microstructure surface. Using this structure as an optical coupling end can simplify the optical projection system. The light incident enters the planar waveguide 3 and reaches the optical coupling end 301 before being reflected and confined to propagate in the planar waveguide 3. The optical path after entering the planar waveguide 3 is the same as the first embodiment.

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Abstract

The invention discloses a projection type planar waveguide helmet-mounted displayer. The projection type planar waveguide helmet-mounted displayer comprises a mini-type display device, a projection optical system, a planar waveguide and a reflection type projection screen, the planar waveguide is internally provided with an optical coupling-in end and an optical coupling-out end, and light rays sent by the mini-type display device are imaged through the projection optical system and are transmitted to enter the optical coupling-in end of the planar waveguide. The optical coupling-in end reflects the received light rays to enable the reflected light rays to be totally reflected between two reflection planes of the planar waveguide many times to be transmitted to the optical coupling-out end of the planar waveguide. The optical coupling-out end reflects the received light rays to the reflection type projection screen. The reflection type projection screen reflects the received light rays to enable the light rays to return according to the original path, then the light rays are transmitted to the human eyes from the optical coupling-out end of the planar waveguide. By means of the method, the problem that an existing helmet-mounted displayer is large is solved, the observing view field can be expanded by designing different structures, and the designing difficulty of the projection optical system is reduced.

Description

technical field [0001] The invention relates to the fields of augmented reality and virtual reality, in particular to a projected planar waveguide helmet-mounted display. Background technique [0002] The helmet image display system for virtual reality and augmented reality is a popular product in the display field in recent years. It is widely used in many fields such as entertainment, scientific research, medical treatment, military affairs, and education. In order to generate a highly immersive graphic image system, The helmet-mounted display device needs to be able to provide a large field of view, and it also needs to be compact and lightweight to reduce fatigue on the user's neck. [0003] figure 1 It was proposed by J.Fergason, and later H.Hua and J.Rolland proposed a schematic diagram of the structure of a projection helmet display. The light emitted by the micro-display is imaged by the projection optical system and then reflected through the semi-transparent and s...

Claims

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Application Information

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IPC IPC(8): G02B27/01G02B27/00G02B6/122
Inventor 程德文宋维涛王涌天刘越
Owner BEIJING NEDPLUSAR DISPLAY TECH CO LTD
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