System and method of driving a multiplexed liquid crystal displa

Details System and method of driving a multiplexed liquid crystal displa System and method of driving a multiplexed liquid crystal displa

1980-02-15

1983-01-25

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340805, 350331R, G09G 336

Patent

active

043706479

ABSTRACT:
A system and method for driving a multiplexed liquid crystal display (LCD) of duty cycle 1/N is described. The drive system includes M number of segment conductors and N number of drive conductors arranged in a matrix array, the intersection of a drive conductor with a respective segment conductor representing one segment of the display. A signal generator is provided for generating first and second electrical signals having respective first and second predetermined frequencies, the second frequency being substantially greater than the first frequency. A first logic circuit applies the second signal to the drive conductors one-at-a-time in a predetermined sequence and applies the first signal during the remainder of the cycle. Similarly, a second logic circuit responsive to data signals indicative of the information to be displayed applies segment signals representing the ON/OFF states of each segment to the respective segment conductors. Each segment signal is comprised of a series of second signal components. The resultant signal applied to the ON segments has a higher frequency than that of the resultant signal applied to the OFF segments.

REFERENCES:
patent: 3911421 (1975-10-01), Alt et al.
patent: 4048633 (1977-09-01), Sano
patent: 4116543 (1978-09-01), Stein
patent: 4231035 (1980-10-01), van Doorn et al.

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