Image display apparatus
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United States of America Patent
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Oct 4, 2016
Grant Date -
Nov 26, 2015
app pub date -
Aug 6, 2015
filing date -
Oct 20, 2011
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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.
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