Computer graphics processing and selective visual display system – Display driving control circuitry – Physically integral with display elements
Patent
1993-12-03
1994-10-18
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display driving control circuitry
Physically integral with display elements
345 98, 345200, G09G 336
Patent
active
053572670
ABSTRACT:
An image information control apparatus includes a partial write detector having at least two types of memory units for detecting and storing addresses accessed to a VRAM in units of lines in a scanning direction, thereby repeating the detection and the storage at different cycles, a circuit for performing calculations to recognize partial write information from contents of each of the memory units, memory units for storing the respective calculation results, a circuit for comparing the memory contents to determine a size relationship between partial write areas, a partial write ID signal controller for controlling a partial write ID signal on the basis of the size relationship between partial write areas and externally outputting the signal, and a circuit for, even when partial writing is being executed, forcibly interrupting the partial writing in accordance with a state of an external refresh control signal, starting refresh, and restarting the partial writing in accordance with a partial write state and a change in state of the refresh control signal.
REFERENCES:
patent: 4655561 (1987-04-01), Kanbe et al.
patent: 4693563 (1987-09-01), Harada et al.
patent: 5091723 (1992-02-01), Kanno et al.
patent: 5172167 (1992-12-01), Kanno et al.
Canon Kabushiki Kaisha
Liang Regina
Weldon Ulysses
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