Projection display device
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United States of America Patent
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Feb 23, 2021
Grant Date -
Mar 8, 2018
app pub date -
Mar 2, 2016
filing date -
Mar 31, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A projection display device includes: a light source that emits a first laser light for displaying a projection and a second laser light for inspection; a scanning drive mirror that reflects the first laser light and the second laser light emitted from the light source, and uses the first laser light and the second laser light in scanning; a light diffusion unit that allows the first laser light used in the scanning by the scanning drive mirror to be transmitted through the light diffusion unit and diffuses the first laser light; a light selection unit that allows the first laser light to be transmitted through the light selection unit and reflects the second laser light at a position on an emission surface of the light diffusion unit; and a light detection unit that detects the second laser light reflected by the light selection unit.
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