Matrix display apparatus and display data supply circuit for sto

Details Matrix display apparatus and display data supply circuit for sto Matrix display apparatus and display data supply circuit for sto

1989-07-11

1992-06-02

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

340703, 340701, G09G 336

Patent

active

051190834

ABSTRACT:
In accordance with a write address successively updated in synchronism with a dot clock, color display data is written into a memory. The memory includes three memory corresponding to three primary colors and having identical addresses thereto assigned. For the purpose of color display, the written display data is read out three times consecutively during one write clock interval. A read address generator for supplying a read address successively changed to the memory is reset when addresses have been generated up to the number of horizontal display dots. The resetting is performed when the number of horizontal display dots detected from the dot clock and a display timing signal has coincided with a read address signal outputted from the read address generator. Since the reset timing of the read address generator changes according to the number of horizontal display dots detected by horizontal display dot number detector, it is possible to cope with a change of the personal computer supplying input data without changing the circuit.

REFERENCES:
patent: 4701864 (1987-10-01), Takashima et al.
patent: 4855728 (1989-08-01), Mano et al.
patent: 4896146 (1990-01-01), Narumiya
patent: 4990902 (1991-02-01), Zanda

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