公开(公告)号：US09460647B2

公开(公告)日：2016-10-04

申请号：US14819763

申请日：2015-08-06

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kenichi Kasazumi ,  Keiji Sugiyama ,  Kakuya Yamamoto

IPC: G02B5/18 ,  G03H1/22 ,  G09G3/02 ,  G02B26/08 ,  G02B27/22 ,  G09G3/36

CPC classification number: G09G3/02 ,  G02B5/1842 ,  G02B26/0808 ,  G02B27/2271 ,  G03H1/2286 ,  G03H1/2294 ,  G03H2222/18 ,  G03H2240/51 ,  G09G3/3611 ,  G09G2320/0233 ,  G09G2320/0626 ,  G09G2320/0646 ,  G09G2360/16

Abstract: An image display apparatus, including: a light source which emits coherent light; a spatial modulation element which diffracts the coherent light by displaying a diffraction grating pattern corresponding to an input image and which displays a virtual image by the diffracted light; and a control unit which calculates a total brightness representing a sum total of brightnesses of all pixels of the input image, and controls at least one of the light source and the spatial modulation element in such a manner that, if the total brightness has decreased, the virtual image is displayed at a lower brightness than a reference virtual image displayed when the input image is used directly.