Backlight device and holographic 3-dimensional image display device including the same
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United States of America Patent
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Nov 1, 2022
Grant Date -
Mar 25, 2021
app pub date -
Aug 24, 2020
filing date -
Sep 23, 2019
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Abstract
A backlight device includes: a light source to emit coherent light; an optical path difference generator on the light source, the optical path difference generator including an incident surface and a plurality of light emitting surfaces, the light emitting surfaces being parallel to the incident surface and having different separation distances from the incident surface; a light condenser on the optical path difference generator; a diffuser on the light condenser; and a collimator on the diffuser.
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