Title:
投射型表示装置
Document Type and Number:
Japanese Patent JP4136217
Kind Code:
B2
Abstract:
A projection type display apparatus is arranged to be able to implement both brightness-priority display and color-reproduction-priority display by itself. In the display apparatus, white light from a light source 1 is separated into beams of three colors by a color separation optical system comprised of a combination of dichroic mirrors DM1, DM2, total reflection mirrors M1, M2, M3, etc., and the beams of the three colors are made incident to liquid-crystal display units 8R, 8G, 8B. After that, the beams are combined by a dichroic prism 9 and images of the liquid-crystal display units 8R, 8G, 8B are projected by a projection lens 10. In this display apparatus, a dichroic filter DF for transmitting light in a region not less than a certain wavelength (for example, about 600 nm) but intercepting light in the other region is arranged so as to be able to be put into or out of an optical path immediately before the liquid-crystal display unit 8R. When the dichroic filter DF is not put in the optical path, the light in the wavelength region not less than about 570 nm is used as projection light. When the dichroic filter DF is put in the optical path, the light in the region not less than about 600 nm is used as projection light in the red band.
Inventors:
Hiroyuki Kodama
Atsushi Okuyama
Atsushi Okuyama
Application Number:
JP23547999A
Publication Date:
August 20, 2008
Filing Date:
August 23, 1999
Export Citation:
Assignee:
Canon Inc
International Classes:
G03B21/00; G02B27/14; G02F1/13; G02F1/1335; G02F1/13357; G03B33/12; H04N9/31
Domestic Patent References:
| JP6034929A | ||||
| JP7072450A | ||||
| JP7318922A | ||||
| JP11249098A | ||||
| JP2000227578A |
Attorney, Agent or Firm:
Keizo Nishiyama
Yuichi Uchio
Yuichi Uchio