Back to results
US 6,212,013 B1Granted
Projection type display apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHiroyuki Kodama, Atsushi Okuyama
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeCanon Kabushiki Kaisha
InventorsHiroyuki Kodama, Atsushi Okuyama
Estimating the term…
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.
A projection type display apparatus which has a brightness-priority display mode and a color-reproduction-priority display mode and in which light from a light source is seperated into a plurality of light beams of mutually different colors, the light beams of the respective colors are guided into corresponding pixel groups among a plurality of pixel groups, and the light beams of the respective colors from the plurality of pixel groups are projected,
A projection type display apparatus which has a brightness-priority display mode and a color-reproduction-display mode and in which light from a light source is seperated into a plurality of light beams of mutually different colors, the light beams of the respective colors are guided into corresponding pixel groups among a plurality of pixel groups, and the light beams of the respective colors from the plurality of pixel groups are projected, said display apparatus including an optical element which is adapted to transmit light in a wavelength region exceeding a predetermined wavelength and intercept light in the remainder in the visible region or which is adapted to transmit light in a wavelength region below a predetermined wavelength and intercept light in the remainder in the visible region enhance purity of a predetermined color,
A projection type display apparatus which has a brightness-priority display mode and a color-reproduction-display mode and which comprises:
Dependencies are inferred from the claim text.