PROJECTION DISPLAY DEVICE

Japanese Patent JP2018112751

A

PROBLEM TO BE SOLVED: To provide a projection display device that can prevent a burden from being imposed on the eyes of a person who sees projection display.SOLUTION: A projection display device comprises: a light source that emits a first laser beam for projection display and a second laser beam for inspection; a drive reflection part that reflects and scans the first laser beam and second laser beam emitted from the light source; a light diffusion part that has a predetermined area for transmitting and diffusing the first laser beam scanned by the drive reflection part; at least one mirror that guides, of the first laser beam diffused in the predetermined area of the light diffusion part, a beam for projection display; a light detection part that detects the second laser beam through the predetermined area of the light diffusion part; and a control part that determines the state of the predetermined area of the light diffusion part on the basis of a value detected by the light detection part. The light diffusion part is a microlens array. When determining, as the state of the predetermined area of the light diffusion part, that a trouble occurs in the predetermined area of the light diffusion part, the control part executes processing to stop projection display.SELECTED DRAWING: Figure 1

SAKURAI NAOTO
OGURI AKIHIRO

JP2018046983A

July 19, 2018

March 14, 2018

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HAMAMATSU PHOTONICS KK

G02B26/10; B60K35/00; G02B27/01; G03B21/00; G03B21/14; G03B21/28; G09F9/00; H04N5/74

JP2014139656A	2014-07-31
JP2007017649A	2007-01-25
JP2015022251A	2015-02-02
JP2014171130A	2014-09-18
JP2010231191A	2010-10-14

WO2015004724A1	2015-01-15
US6377403B1	2002-04-23

Yoshiki Hasegawa
Yoshiki Kuroki
Kenichi Shibayama

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