US 12,169,354 B2
Projection-type display device
Akihiro Yamakage, Tokyo (JP); Atsushi Kato, Tokyo (JP); and Yufei Mei, Tokyo (JP)
Assigned to LIGHT SHOW TECHNOLOGY CO., LTD., Tokyo (JP)
Filed by Light Show Technology Co., LTD., Tokyo (JP)
Filed on Nov. 14, 2023, as Appl. No. 18/508,463.
Claims priority of application No. 2022-186819 (JP), filed on Nov. 22, 2022; and application No. 2023-060364 (JP), filed on Apr. 3, 2023.
Prior Publication US 2024/0168367 A1, May 23, 2024
Int. Cl. G03B 21/20 (2006.01)
CPC G03B 21/208 (2013.01) [G03B 21/2013 (2013.01); G03B 21/2033 (2013.01); G03B 21/204 (2013.01); G03B 21/2066 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A projection-type display device comprising:
a first collimator lens configured to collimate a plurality of laser beams output from a plurality of semiconductor lasers that emits light at a first wavelength;
a first condenser lens configured to condense the plurality of laser beams collimated by the first collimator lens;
a second collimator lens configured to collimate a plurality of laser beams output from a plurality of semiconductor lasers that emits light at a second wavelength;
a second condenser lens configured to condense the plurality of laser beams collimated by the second collimator lens;
a light diffusing element including a light diffusing surface having an area wider than any of an irradiation spot of the laser beams of the first wavelength condensed by the first condenser lens and an irradiation spot of the laser beams of the second wavelength condensed by the second condenser lens;
a first integrator illumination system configured to superimpose the laser beams of the first wavelength diffused by the light diffusing surface to form a rectangular irradiation region for the first wavelength;
a second integrator illumination system configured to superimpose the laser beams of the second wavelength diffused by the light diffusing surface to form a rectangular irradiation region for the second wavelength;
a first deflection unit disposed at a side of the first integrator illumination system with respect to a position where the rectangular irradiation region for the first wavelength is formed by the first integrator illumination system;
a second deflection unit disposed at a side of the second integrator illumination system with respect to a position where the rectangular irradiation region for the second wavelength is formed by the second integrator illumination system;
a transfer optical system configured to transfer the rectangular irradiation region for the first wavelength deflection-scanned by the first deflection unit and the rectangular irradiation region for the second wavelength deflection-scanned by the second deflection unit in an enlarged manner to a reflective light modulation element; and
a projection lens configured to project image light output from the reflective light modulation element.