Frame size regulating circuit

Details Frame size regulating circuit Frame size regulating circuit

1996-12-24

1999-03-23

Nguyen, Chanh

Computer graphics processing and selective visual display system

Data responsive crt display control

Data responsive deflection control

G09G 106

Patent

active

058866779

ABSTRACT:
A frame size regulating circuit capable of simultaneously controlling horizontal and vertical sizes to simply vary a frame size includes a key matrix formed by plural keys for simultaneously varying horizontal and vertical sizes of a frame, and a microprocessor which generates plural pulsewidth modulation signals for determining the frame size according to an externally-supplied horizontal sync signal and vertical sync signal and scans a key selected in the key matrix to generate plural frame size variation signals. A frame size determinator part provides a horizontal size determination signal of DC component and a vertical size determination signal of DC component according to the plurality of pulsewidth modulation signals, and a frame size variable part varies magnitudes of the horizontal size determination signal of DC component and of the vertical size determination signal of DC component according to the plural frame size variation signals to vary the size of the frame. Thus, the frame size is simply varied by the key selection of the key matrix.

REFERENCES:
patent: 3643251 (1972-02-01), Kolb et al.
patent: 5216412 (1993-06-01), Gawell et al.
patent: 5550556 (1996-08-01), Wu et al.
patent: 5565897 (1996-10-01), Kikinis et al.

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