Graphic display device

Details Graphic display device Graphic display device

1975-05-28

1977-03-08

Trafton, David L.

Communications: electrical

Systems

Portable self-contained

3401725, 340324A, G06K 1520, G06F 314

Patent

active

040115569

ABSTRACT:
A graphic display device of the type which receives data and instructions from an external computer and displays graphic patterns such as alphanumeric characters, symbols, etc., upon a cathode ray tube in accordance therewith. The graphic display device has a pattern generator for storing luminance data controlling the formation on the cathode ray tube of predetermined patterns, and a refresh memory for receiving and storing data designating the particular arrangement of patterns to be displayed, and is characterized by an arrangement reducing the required capacity of the pattern generator memory. Pursuant to the invention, the pattern generator is formed with a random access memory into which data can be written and from which data can be read, and has means operated on a time sharing multiplexing basis with data reading operations for writing luminance data supplied by the external computer into the pattern generator memory, and for storing in the refresh memory the addresses of the luminance data written into the pattern generator memory. The pattern generator need store formation data for only those characters actually being displayed on the cathode ray tube, and memory requirements are minimized.

REFERENCES:
patent: 3400377 (1968-09-01), Lee
patent: 3848232 (1974-11-01), Leibler et al.

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