Liquid crystal display drive circuit with variable sequence of b

Details Liquid crystal display drive circuit with variable sequence of b Liquid crystal display drive circuit with variable sequence of b

1986-01-06

1988-04-12

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340784, 340793, 340805, G09G 336

Patent

active

047377828

ABSTRACT:
A drive circuit is used to drive a data matrix liquid crystal display panel that can be applied to a variety of uses wherein said drive circuit either generates the backplate signal using any optional sequence or optionally provides any desired duty factor.
The drive circuit chip itself contains RAM, and in responding to the data contents in said RAM, both the backplate and segment signals are generated, where the drive circuit provides any desired sequence that can optionally be determined in accordance with the RAM data contents.
As an alternative embodiment of the present invention, the drive circuit chip comprises a built-in counter that determines the duty factor of the liquid crystal enable signals, where the duty factor can optionally be set by varying the operational conditions of said counter.

REFERENCES:
patent: 3594778 (1971-07-01), Herald et al.

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