Image display apparatus and optical element having light guide plate with grating pitches on light incident and emitting sections thereof
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United States of America Patent
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Feb 12, 2019
Grant Date -
Sep 28, 2017
app pub date -
Mar 16, 2017
filing date -
Mar 23, 2016
priority date (Note) -
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Abstract
An image display apparatus includes an image light generating unit that emits image light; a light guide plate in which the image light emitted from the image light generating unit is incident; an incident side diffraction optical element disposed in a light incident section of the light guide plate; and an emission side diffraction optical element disposed in a light emitting section of the light guide plate, wherein a grating pitch of the incident side diffraction optical element and the grating pitch of the emission side diffraction optical element are different in a state where the image light generating unit is not in operation.
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