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High‐efficiency light‐collection optics for lamp‐based projection TV
Author(s) -
Kuwata Muneharu,
Takeuchi Hayato,
Sasagawa Tomohiro,
Yagyu Shinji,
Sugiura Hiroaki
Publication year - 2007
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.2798823
Subject(s) - optics , luminance , reflector (photography) , projection (relational algebra) , nonimaging optics , light source , point (geometry) , coupling (piping) , point source , computer science , physics , materials science , optoelectronics , mathematics , geometry , algorithm , metallurgy
— A new light‐collection optics has been developed that enhances the luminance of projection TV which use lamps as the light source. The conventional optical system consists of an elliptical reflector and a flat‐surface front glass, but these systems cannot sufficiently collect the beams coming from the light source, and they cause loss in the coupling with the light pipe. To solve this problem, we devised a new optical system through a structure of an aspherical reflector and an aspherical front glass. This new optical system concentrates the beams coming from the light source to a smaller point which improves the coupling efficiency. Thus, we have successfully increased the luminance of the projection TV by approximately 10%. This paper reports the design principles of the new optical system and the results of a prototype experiment.