Image display apparatus
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United States of America Patent
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Mar 21, 2017
Grant Date -
Mar 26, 2015
app pub date -
Sep 25, 2014
filing date -
Sep 26, 2013
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Abstract
An image display apparatus includes at least one light source to emit coherent light, a holographic optical element to diffract the coherent light from the light source to produce image light, an optical mechanism to guide the image light from the holographic optical element, at least one detection unit to detect the intensity of the image light, and an adjustment unit to adjust the power of the light source based on the result of detection by the detection unit. An image based on the image light is observed by a viewer.
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