US 11,991,482 B2
Illumination system, projection device, and projection control method
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 Oct. 28, 2022, as Appl. No. 17/975,607.
Claims priority of application No. 202111297969.6 (CN), filed on Nov. 4, 2021.
Prior Publication US 2023/0134505 A1, May 4, 2023
Int. Cl. H04N 9/31 (2006.01); G03B 21/20 (2006.01)
CPC H04N 9/3164 (2013.01) [G03B 21/2066 (2013.01); H04N 9/3182 (2013.01); H04N 9/3197 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An illumination system, comprising:
a first light-emitting unit comprising a first light-emitting element and a second light-emitting element, wherein the first light-emitting element provides a first sub-light beam, and the second light-emitting element provides a second sub-light beam, a main light emission wavelength range of the first sub-light beam falls within a main light emission wavelength range of the second sub-light beam, and the main light emission wavelength range of the second sub-light beam is greater than the main light emission wavelength range of the first sub-light beam;
a second light-emitting unit configured to provide a second light beam;
a third light-emitting unit configured to provide a third light beam;
a first dichroic element located on a transmission path of the second light beam and the third light beam;
a second dichroic element located on a transmission path of the first sub-light beam, the second sub-light beam, the second light beam, and the third light beam, wherein the second light beam is transmitted to the second dichroic element after being reflected by the first dichroic element, the third light beam is transmitted to the second dichroic element after passing through the first dichroic element, the second light beam and the third light beam are reflected by the second dichroic element to form a portion of an illumination light beam, and at least one of the first sub-light beam and the second sub-light beam is reflected by the second dichroic element or passes through the second dichroic element to form another portion of the illumination light beam; and
a control unit electrically connected to the first light-emitting unit and configured to switch the illumination system between a high-performance mode and a high-chroma mode, wherein when the illumination system is in the high-performance mode, the control unit controls a current ratio of the second light-emitting element to be greater than a current ratio of the first light-emitting element, and when the illumination system is in the high-chroma mode, the control unit controls the current ratio of the second light-emitting element to be less than the current ratio of the first light-emitting element.