Emulation of single line display with multi-line display driver

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

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345 61, G09G 320

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active

057036098

ABSTRACT:
A single-line 16 character display is driven using a display driver designed to drive two independent 8 character single-line displays. Conceptually, the 16 character display is treated as the two independent 8 character displays placed side by side. The message for display is placed in a first area of driver memory corresponding to the first 8 character display. A truncated version of the same message for display, with an offset at the beginning equal to the number of characters in the first display line, is stored in a second area of driver memory corresponding to the second 8 character display line. When the message and the truncated version thereof are simultaneously displayed, an observer views a single, coherent 16 character single line display. If the message is greater than 16 characters, the driver scrolls both the message for display and the truncated version thereof, creating a single scrolled message from the point of view of the observer.

REFERENCES:
patent: 3976995 (1976-08-01), Sebestyen
patent: 4398819 (1983-08-01), Schron
patent: 4660032 (1987-04-01), Tsunoda
patent: 4803478 (1989-02-01), Olsen
patent: 4888610 (1989-12-01), Tsujimoto et al.
patent: 5229759 (1993-07-01), Wong
patent: 5285493 (1994-02-01), Wagai et al.
"HD44780U Dot-Matrix Liquid Crystal Display Controller/Driver", Dec. 1992, Hitachi, Ltd. pp. 1-59.

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