Control interface for LCD dot matrix displays and method of operating the same
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
Nov 7, 1991
filing date -
Nov 7, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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