Television – Image signal processing circuitry specific to television – Chrominance signal amplitude control
Patent
1993-08-11
1994-04-05
Groody, James J.
Television
Image signal processing circuitry specific to television
Chrominance signal amplitude control
348708, 348625, 348751, H04N 969, H04N 931, H04N 9535
Patent
active
053010175
ABSTRACT:
A projection-type display apparatus having a lamp which emits a high intensity white light, two dichroic mirrors which filter out the three primary color beams from the white light and three liquid crystal panels which, respectively, modulate the color beams according to the three color image signals. Characteristics of the lamp and the dichroic mirrors are set so that the reproduction chromaticity range includes transmission chromaticity ranges of both the NTSC and HDTV systems. The image signals are supplied to two types of linear matrix circuit which are, respectively, suited for the NTSC and HDTV systems in order to correct color reproduction errors. The output of the linear matrix circuits are selected according to the system of the received television signal. In addition, a display white color temperature is set in the corrected image signals according to the system. Thus, the image signals are supplied to a display device such that the colors of the image can be accurately reproduced.
REFERENCES:
patent: 4167750 (1979-09-01), Tomimoto et al.
patent: 4553157 (1985-11-01), Hurst, Jr. et al.
patent: 5132793 (1992-07-01), Hirahata et al.
patent: 5208661 (1993-05-01), Jaspers
Burgess Glenton B.
Groody James J.
Kabushiki Kaisha Toshiba
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