Three tube color television projection display device

Details Three tube color television projection display device Three tube color television projection display device

1991-12-20

1994-03-08

Chin, Tommy P.

Television

Video display

Projection device

348745, H04N 574, H04N 931

Patent

active

052932265

ABSTRACT:
A three tube type projection television display device comprising red, green and blue projection tubes, wherein optical axes of projection lenses for the inclined projection tubes are off centered, instead of preparing a number of optical couplers of different sizes, from that of the inclined projection tubes by an eccentricity of .delta. when a projection picture size is varied for correcting a trapezoidal distortion in the same way as in the Scheimpflug rule, providing good registration on the screen and also bringing the projected pictures into focus on the entire screen.

REFERENCES:
patent: 4087835 (1978-05-01), Nishimura
patent: 4352124 (1982-09-01), Kline
patent: 4376949 (1983-03-01), Rowe
patent: 4609945 (1986-09-01), Oguino
patent: 4651217 (1987-03-01), Yamazaki
patent: 5010397 (1991-04-01), Hasegawa
patent: 5103302 (1992-04-01), Yoshida

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