Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1982-08-12
1984-06-26
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340765, 340811, 340813, 350332, G09G 318
Patent
active
044569106
ABSTRACT:
The present invention relates to a PMOS or NMOS driver for a liquid crystal display. The driver is designed for ac excitation of the display with a minimum dc component, and with minimum excitation of "off" segments for optimum display performance. The drive circuitry includes a pair of larger capacity drivers, which exhibit alternate high and low output states, between which the individual segments and the backplane of the display are connected for ac excitation. A pair of lower capacity switches are provided in association with each segment. The first lower capacity switch connects the segment to be activated to one of the drivers, and a second switch, maintained in a state alternate to that of the first switch, disconnects that segment from the backplane. When the segment switches are turned on strongly, as by a voltage doubling input circuit, the desired LCD driver performance is achieved using a non-complementary design of lower cost than the conventional CMOS driver.
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patent: 3794990 (1974-02-01), Kishimoto
patent: 3936676 (1976-02-01), Fujita
patent: 4019178 (1977-04-01), Hashimoto et al.
patent: 4040721 (1977-08-01), Kurita
patent: 4050064 (1977-09-01), Hashimoto et al.
patent: 4060802 (1977-11-01), Matsuki
patent: 4099073 (1978-07-01), Hashimoto et al.
patent: 4245168 (1981-01-01), Waldron
patent: 4395708 (1983-07-01), Lloyd
DiMassimo Donald V.
May John B.
Brigance Gerald L.
General Electric Company
Lang Richard V.
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