US 11,947,251 B2
Illumination system and projection apparatus
Chi-Fu Liu, Hsin-chu (TW); Tsung-Hsin Liao, Hsin-Chu (TW); Chun-Li Chen, Hsinchu (TW); and Hung-Yu Lin, Hsin-chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Mar. 23, 2022, as Appl. No. 17/701,680.
Claims priority of application No. 202120587249.2 (CN), filed on Mar. 23, 2021.
Prior Publication US 2022/0308436 A1, Sep. 29, 2022
Int. Cl. G03B 21/20 (2006.01); G02B 27/10 (2006.01); G03B 21/14 (2006.01)
CPC G03B 21/2066 (2013.01) [G02B 27/1006 (2013.01); G03B 21/142 (2013.01); G03B 21/206 (2013.01); G03B 21/2033 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An illumination system configured to provide an illumination beam, the illumination system comprising a red light source, a green light source, a blue light source, a first supplementary light source, a first X-shaped light-splitting assembly, a first light-splitting element, and a light-uniforming element, wherein
the red light source provides a red beam,
the green light source provides a green beam,
the blue light source provides a blue beam,
the first supplementary light source provides a first supplementary beam,
the first X-shaped light-splitting assembly is configured to reflect the first supplementary beam and the red beam to the first light-splitting element, and is configured to allow the blue beam to pass through to the first light-splitting element,
the first light-splitting element is configured to guide the red beam, the green beam, the blue beam, and the first supplementary beam to be transmitted to the light-uniforming element, and
the light-uniforming element is configured to provide the red beam, the green beam, the blue beam, and the first supplementary beam from the first light-splitting element to form the illumination beam,
wherein the first supplementary beam is a red supplementary beam or a blue supplementary beam, and the illumination system comprises at least five light-emitting elements.