TY - JOUR
T1 - A higher-contrast, ghost-ray-deflecting, total-internal-reflection light separator for LED DLP projectors
AU - Wang, Hsiang Hua
AU - Pan, Jui-Wen
AU - Huang, Yung Chih
AU - Chiang, Che Wen
PY - 2014/1/1
Y1 - 2014/1/1
N2 - In this paper, we present a novel light separator with the ability to enhance the contrast ratio and maintain the optical efficiency in a digital light processing (DLP) projection system. The working theorem for the novel light separator is derived as well. In this novel light separator design, the ghost ray is directed away from the projection lens by a total internal reflection surface. Since the ghost ray does not even enter the projection lens, the contrast ratio enhancement is more effective than that achieved by an asymmetrical stop. Compared with the conventional method, the full-on/full-off (FO:FO) contrast ratio is increased from 921:1 to 46347:1 and the American National Standards Institute (ANSI) contrast ratio is increased from 177:1 to 295:1. The imaging system efficiency can maintain at 79.8% under the contrast ratio enhancement process.
AB - In this paper, we present a novel light separator with the ability to enhance the contrast ratio and maintain the optical efficiency in a digital light processing (DLP) projection system. The working theorem for the novel light separator is derived as well. In this novel light separator design, the ghost ray is directed away from the projection lens by a total internal reflection surface. Since the ghost ray does not even enter the projection lens, the contrast ratio enhancement is more effective than that achieved by an asymmetrical stop. Compared with the conventional method, the full-on/full-off (FO:FO) contrast ratio is increased from 921:1 to 46347:1 and the American National Standards Institute (ANSI) contrast ratio is increased from 177:1 to 295:1. The imaging system efficiency can maintain at 79.8% under the contrast ratio enhancement process.
UR - http://www.scopus.com/inward/record.url?scp=84904962032&partnerID=8YFLogxK
U2 - 10.1002/j.2168-0159.2014.tb00213.x
DO - 10.1002/j.2168-0159.2014.tb00213.x
M3 - Article
AN - SCOPUS:84904962032
SN - 0097-966X
VL - 45
SP - 813
EP - 816
JO - Digest of Technical Papers - SID International Symposium
JF - Digest of Technical Papers - SID International Symposium
IS - 1
ER -