Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1996-05-15
1998-08-04
Lao, Lun-Yi
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
345204, 348529, G09G 500
Patent
active
057901120
ABSTRACT:
An oscillation and trigger circuit for a vertical synchronizing signal in a display apparatus, the oscillation and trigger circuit comprising: a pulse generator for generating a single pulse for each active cycle of the vertical synchronizing signal; a first signal detector having an input terminal connected to an output terminal of the pulse generator, for determining a state of no input of the vertical synchronizing signal whose frequency is less than a predetermined frequency and for generating a first predetermined signal indicative of the state; a second signal detector having input terminals connected to respective output terminals of the pulse generator and the first signal detector, for checking a time interval of the vertical synchronizing signal input to the pulse generator so as to output a second predetermined signal when the time interval exceeds a predetermined time period and for outputting the second predetermined signal responsive to the first predetermined signal input from the first signal detector; an input signal detector connected to the first signal detector, for determining an input of the vertical synchronizing signal; a multiplexer having a selection input terminal connected to receive the second predetermined signal output from an output terminal of the second signal detector, for selecting for output one of a first clock signal of a predetermined frequency and the vertical synchronizing signal; and a vertical oscillator having an input terminal connected to an output terminal of the multiplexer, for generating a vertical oscillation signal of a predetermined frequency in response to the selected one of the clock signal and the vertical synchronizing signal selected by the multiplexer.
REFERENCES:
patent: 4423440 (1983-12-01), Tachi
patent: 5530798 (1996-06-01), Chu et al.
patent: 5555032 (1996-09-01), Kung
Bushnell Esq Robert E.
Lao Lun-Yi
Samsung Electronics Co,. Ltd.
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