Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-12-21
1988-11-01
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
350333, 307353, 328151, 340765, 340784, C02F 113, G09G 318, G09G 336, H03K 5159
Patent
active
047814373
ABSTRACT:
An on-substrate driver circuit for a display line of a liquid crystal display having an amplifier connected in conjunction with an amplifier input capacitor, a sample/hold capacitor and three switches. The circuit operates in a first compensation mode wherein the first and second of the switches connect both a null reference voltage and the amplifier output voltage to the amplifier input capacitor, effectively nulling out or compensating for offset between the turn-on threshold, and hence the output, of a plurality of amplifiers on the display. After compensation, the circuit is switched to an operational mode wherein the first and second switches are open and a third switch connects the analog display signal to the sample/hold capacitor. A second preferred embodiment employing a double buffer including two consecutive, serially connected amplifier stages as described is also disclosed. In practice, a plurality of such double buffer circuits are arranged along the edge of a liquid crystal display panel and supplied with a common input signal by a single off-substrate input signal line.
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Cooper, Jr. James E.
Shields Steven E.
Hughes Aircraft Company
Karambelas Anthony W.
Mai Thuy K.
Miller Stanley D.
Szabo Joseph E.
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