Display apparatus

Details Display apparatus Display apparatus

Filed on

1982-05-04

Date issued

1985-10-08

Examiner

Curtis, Marshall M.

Patent Class

Communications: electrical

SubClass

Land vehicle alarms or indicators

SubSubClass

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

Other Related Categories

340731, 340744, 340814, G09G 116

Type

Patent

Status

active

Patent number

045463506

Description

ABSTRACT:
An improved timing signal generating circuit for use in a raster-scanning CRT display apparatus. The circuit provides timing signals including memory control signals and clocks for the screen memory which stores data for characters and graphic patterns to be displayed on the CRT display unit, the CRT control circuit which supplies the synchronizing signal to the display unit and supplies the display address signal to the screen memory, and the processing circuit which reads and writes the screen memory. The timing signal generating circuit comprises a counter for dividing the frequency of the original oscillation signal, a first memory device which receives at its address terminal the output of the counter, and a second memory device which receives at its input terminal the output of the first memory device and stores it in response to the original oscillation signal whereby to provide outputs as the timing signals.

REFERENCES:
patent: 4012592 (1977-03-01), Ricard
patent: 4087808 (1978-05-01), Herndon, Jr.
patent: 4107786 (1978-08-01), Masaki et al.
patent: 4430649 (1984-02-01), Leininger

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