Method for projecting image obtained by using liquid crystal pan

Details Method for projecting image obtained by using liquid crystal pan Method for projecting image obtained by using liquid crystal pan

1992-03-18

1995-04-04

Groody, James J.

Television

Video display

Projection device

359 51, 348744, H04N 931

Patent

active

054041759

ABSTRACT:
In a projection-type display apparatus using light scattering type liquid crystal devices, light from a light source is reflected by a reflecting mirror through a collecting lens; reflected light is converted by a lens into a parallel light beam, which is injected into liquid crystal devices disposed on three sides through a dichroic mirror, the liquid crystal devices coloring an image in red, green and blue; the image is projected on a screen through again the dichroic mirror, the collecting lens and an enlarging lens. Further a photodetector is disposed at a focal point of the collecting lens and a function of adjusting the position of the light source on the basis of a result of this detection is added.

REFERENCES:
patent: 4796978 (1989-01-01), Tanaka et al.
patent: 4842374 (1989-06-01), Ledebuhr
patent: 4943154 (1990-07-01), Miyatake
patent: 4983032 (1991-01-01), Van Der Brandt
patent: 5095377 (1992-03-01), Kobayashi
patent: 5150232 (1992-09-01), Gunkima
patent: 5170250 (1992-12-01), Ledebuhr
patent: 5260815 (1993-11-01), Takizawa
M. Kunigita et al, A Full color Projection TV/using LC/Polymer Composite Light Valves (1990) pp. 227-230.
Shinji et al, LCD Full Color Video Projector (1986) pp. 375-378.

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