Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-09-27
1993-03-23
Mis, David
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
340784, 340793, H03K 301, H09G 300
Patent
active
051967383
ABSTRACT:
A data driver circuit of TFT-LCD having a plurality of power source voltage terminals with different voltage levels, an output terminal for providing a voltage to the TFT-LCD, a plurality of analog switches with load resistances provided between one of the source voltage terminals and the output terminal and having a switching terminal, and a voltage selection circuit for transmitting an ON signal to a selected one or more of the respective switching terminals of the analog switches. When an individual analog switch is turned ON, the corresponding source voltage value is supplied to the output terminal of the driver circuit and when two or more analog switches are selectively turned on, a combination of the voltage levels of the respective source voltage is associated with those switches which are turned ON is produced as the driver circuit output voltage, thereby affording a greater number of gray levels as the driver circuit output voltage levels than the number of power source voltage levels.
REFERENCES:
patent: 3522420 (1970-08-01), Hartmann et al.
patent: 3560957 (1971-02-01), Miura et al.
patent: 5099192 (1992-03-01), Thayer et al.
Patent Abstracts of Japan, vol. 12, No. 402 (E-673) Oct. 25, 1988 & JP-A-63 141414 (Matsushita Electric Ind. Co.) Jun. 13, 1988.
Patent Abstracts of Japan, vol. 14, No. 487 (P-1121) Oct. 23, 1990 & JP-A-2 198432 (Nec Co.) Aug. 6, 1990.
"Driving Method for TFT/LCD Grayscale," IBM Technical Disclosure Bulletin, vol. 33, No. 68, Nov. 1990, New York, N.Y., pp. 384-385.
Aoki Tetsuo
Asami Fumitaka
Oda Masami
Takahara Kazuhiro
Yamaguchi Hisashi
Fujitsu Limited
Mis David
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