Communications: electrical – Continuously variable indicating – With meter reading
Patent
1980-06-05
1983-05-24
Curtis, Marshall M.
Communications: electrical
Continuously variable indicating
With meter reading
340784, 340713, 350332, G09G 336
Patent
active
043852947
ABSTRACT:
A method and system for driving a liquid crystal display (LCD) with adjustable drive voltages to match selected ones of a number of different liquid crystal materials utilize variable duty cycle control. Instead of regulating the battery supply voltage to provide desired driving voltage, the driving voltage is disabled for preselected portions of each cycle thereby controlling the root mean square voltage across the LCD segments during both the display-on and display-off states of each display segment to match the liquid crystal material. Two-, three- and four-way multiplexing or any other level of multiplexing may be used in conjunction with this method and system.
REFERENCES:
patent: 4100540 (1978-07-01), Fujita et al.
patent: 4121203 (1978-10-01), Edwards et al.
patent: 4122661 (1978-10-01), Tsuji
patent: 4127848 (1978-11-01), Shanks
patent: 4257045 (1981-03-01), Miles
Curtis Marshall M.
Heiting Leo N.
Marshall, Jr. Robert D.
Sharp Melvin
Texas Instruments Incorporated
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