Control interface for LCD dot matrix displays and method of oper

Details Control interface for LCD dot matrix displays and method of oper Control interface for LCD dot matrix displays and method of oper

1991-11-07

1998-10-20

Chow, Dennis-Doon

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 59, 345 98, G09G 336

Patent

active

058253416

ABSTRACT:
A control interface for a liquid crystal display having more than 80 characters uses a pair of controller/driver devices each having inputs for eight data bits but being adaptable to operate with four data bits from a 4-bit microprocessor. A standard 8-bit microprocessor is used to control the controller/driver devices by connecting the four bits of a low data nibble of the microprocessor to the four high data bits of one controller/driver and four bits of a high data nibble of the microprocessor to the four high data bits of the other controller/driver. The control interface can interface to liquid crystal displays with less than 80 characters without microprocessor modification.

REFERENCES:
patent: 4262292 (1981-04-01), Duley
patent: 5119083 (1992-06-01), Fujisawa et al.

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