US 12,088,969 B2
Projection display device
Makoto Maeda, Nara (JP); and Sosuke Otani, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Jan. 13, 2022, as Appl. No. 17/575,132.
Application 17/575,132 is a continuation of application No. PCT/JP2020/026123, filed on Jul. 3, 2020.
Claims priority of application No. 2019-135247 (JP), filed on Jul. 23, 2019.
Prior Publication US 2022/0141432 A1, May 5, 2022
Int. Cl. G03B 21/20 (2006.01); H04N 9/31 (2006.01)
CPC H04N 9/3152 (2013.01) [H04N 9/3158 (2013.01); H04N 9/3164 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A projection display device comprising:
a light source unit that generates and emits a white light along a first optical axis;
a lighting unit provided on a second optical axis, the lighting unit splitting the white light into predetermined color lights and uniformizing an illuminance distribution of the predetermined color lights;
an image generator including a display element that modulates the predetermined color lights uniformized by the lighting unit, according to an image signal, and a projection lens that emits and projects an image light including the predetermined color lights modulated along a third optical axis;
at least one optical path switching unit that selectively switches between reflection and transmission of the white light;
a light diffuser including a diffusion optical system that spreads the white light to a desired illumination area and projects the spread white light as an illumination light; and
a controller that causes the at least one optical path switching unit to switch between emission of the image light and emission of the illumination light, wherein
the first optical axis and the third optical axis are substantially parallel to each other.