RMS voltage control with variable duty cycle for matching differ

Details RMS voltage control with variable duty cycle for matching differ RMS voltage control with variable duty cycle for matching differ

1978-10-05

1981-03-17

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340765, 340805, G06F 314, G09F 932

Patent

active

042570450

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

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