Computer graphics processing and selective visual display system – Display driving control circuitry
Patent
1990-02-15
1998-03-03
Wu, Xiao
Computer graphics processing and selective visual display system
Display driving control circuitry
345211, 345110, 348707, G09G 500
Patent
active
057245193
ABSTRACT:
The present invention relates to a complementary transistor circuit and an amplifier using it, and, in particular, to a video amplifier for amplifying video signals and a high-definition CRT display device. In amplifying inputted video signals by using a multiplexer, a gain controller and a current mirror amplifier, each element circuit is formed by using complementary transistor circuits. Circuit simplification is thus attained. In addition, higher precision and band broadening has been realized owing to adoption of a current operation. Further, the present invention makes it possible to eliminate direct feedback from the high voltage output completely by providing a low-voltage output circuit for feedback having a similar relationship with respect to the high-voltage video output stage of the video amplifier, thereby performing negative feedback via a sample-and-hold circuit. This also serves to broaden the bandwidth and reduce power dissipation.
REFERENCES:
patent: 4051521 (1977-09-01), Harwood
patent: 4293875 (1981-10-01), Katz
patent: 4494075 (1985-01-01), Yoshihisa
patent: 4654712 (1987-03-01), Gershfeld
patent: 4722006 (1988-01-01), Kimura et al.
patent: 4755768 (1988-07-01), Shimokawa
Kato Kazuo
Sase Takashi
Sato Hideo
Yamashita Kenkichi
Hitachi , Ltd.
Wu Xiao
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