Conjugated narrow-band tri-phosphor staggered volume holographic grating waveguide near-to-eye optical display device

Abstract

The invention provides a conjugated narrow-band tri-phosphor staggered volume holographic grating waveguide near-to-eye optical display device. The device comprises an image display light source which is used for providing image information to be viewed, a P&S photo-conversion component which is used for converting P light and S light, a collimating lens group which is used for collimating light wave, a PBS component which is used for the polarizing beam-splitting of light wave, a beam-splitting selecting component which is used for uniformly spreading the light wave on a coupling input surface; a conjugated tri-phosphor staggered coupling input volume holographic grating which is used for dispersing incident ray and totally reflecting and transmitting the ray inside the substrate, a light-guide transmitting substrate which is used for totally reflecting and transmitting the light wave, and a conjugated tri-phosphor staggered coupling output volume holographic grating which is used for coupling the dispersed incident ray in sequence and outputting the ray to the outside of the substrate. The device has the advantages of full color, ultra-thinness, large field angle and simplicity in process and implementation, and can be applied to the damage-free display of a mobile screen, the display of a terminal, the scene teaching instruction for a doctor, the real-time information positioning for fire fighting, 3D game and other fields.

Description

technical field [0001] The invention relates to a near-eye optical display device, in particular to a volume holographic grating waveguide near-eye optical display device with conjugate narrow-band three primary colors interlaced. Background technique [0002] At present, there is an increasing amount of information that needs to be browsed in daily life, and there are various ways to display the information in a centralized manner. However, the amount of information displayed by these devices is limited, and will cause damage to human health, especially irreparable damage to the eyesight of the viewer. Therefore, in order to centrally and conveniently grasp and analyze rich and complex image information and ensure the protection of the viewer's eyesight, the near-eye optical display system emerged as a wearable display device that can perfectly embody the above purpose. In order to reflect the concept of augmented reality and free hands, the head-mounted optical display ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve a series of problems caused by the weight, field of view and color crosstalk of the traditional wearable display optical system, the US Patent US7736006B2 applied by Micro Vision Company of the United States provides a display technology solution, which uses a polarizing substrate to realize light wave The transformation of the polarization state allows the large-angle S light to reflect and image, and the small-angle P light to completely pass through the reflective surface. The disadvantage of this scheme is that due to the large-angle S light reflection and P light transmission, the reflection output surface is on the bottom surface of the substrate. The projected area is too small, which is not conducive to the expansion of the field of view, and at the same time increases the difficulty of design, which leads to the inability to reduce the thickness of the device

U.S. Patent US20100260455 adopts a micro-sawtooth structure to expand the display field of view of the device, but the overall thickness of the device is not reduced, and the overall appearance of the device is not good enough to bring comfort to the wearer.

In U.S. Patent No. 7,021,777, the expansion of the field of view of the display device and the thinning of the display device are achieved by using a light-conducting flat panel, but the technical solution is very difficult to implement in terms of the specific design and process of the device. The extended range of display field of view is limited, these factors make the device unsuitable for mass production

Although the planar waveguide near-eye optical display system mentioned in the above patent has improved in terms of weight, volume and field of view expansion, there is no substantial change in the internal adjustment of diopter

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