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Patent Searching and Data


Title:
VIDEO DISPLAY DEVICE AND HEAD-MOUNTED DISPLAY
Document Type and Number:
Japanese Patent JP2010204397
Kind Code:
A
Abstract:

To provide a video display device suitable for reducing influence of a change in a diffraction angle due to the heat shrink of a photopolymer.

The video display device includes: a display element for displaying an image; a light guide member on which the image displayed at the display element is made incident; a first transmissive or reflective HOE (Holographic Optical Element) for totally reflecting the image incident on the light guide member inside the light guide member and diffracting it so as to propagate it to a prescribed position; and a second transmissive or reflective HOE for diffracting the image propagated to the prescribed position toward the pupil of a user. In the first or second transmissive or reflective HOE, the diffraction angle on design is designed to be at least a prescribed angle so that the ratio of the change in the diffraction angle due to the heat shrink of a recording layer is settled to be a prescribed ratio or lower.


Inventors:
SHINDO MIKIO
Application Number:
JP2009050076A
Publication Date:
September 16, 2010
Filing Date:
March 04, 2009
Export Citation:
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Assignee:
HOYA CORP
International Classes:
G02B27/02; G02B5/32; H04N5/64
Attorney, Agent or Firm:
Shuhei Matsuoka