Computer graphics processing and selective visual display system – Display driving control circuitry – Waveform generator coupled to display elements
Patent
1996-06-19
1999-11-02
Luu, Matthew
Computer graphics processing and selective visual display system
Display driving control circuitry
Waveform generator coupled to display elements
345204, 345 55, G09G 500
Patent
active
059779616
ABSTRACT:
Arrayed display pixels are coupled such that all row pixels are coupled together by a row conductive element and all column pixels are coupled together by a column conductive element. The row-coupled pixels are driven by first and second row drivers and the column-coupled pixels are driven by first and second column drivers, a total of four drivers in all. The drivers each output time-varying signals of different frequencies. The vertical scan rate is determined by the frequency differential in the signals output by the two row drivers, and the horizontal scan rate frequency is determined by the frequency differential in the signals output by the two column drivers. The absolute frequencies of the four signals are set proportional to the propagation delay of the medium through which the driver signals travel. The invention implements a pixel enabling signal using the beat-frequency difference between two driver source signals that propagate through a pixel string from opposite ends of the string. The driver difference signal dwells sufficiently long on each pixel location to deliver sufficient energy to turn the pixel on or off. Video information to be displayed is used to modulate at least one of the row drivers and one of the column drivers.
REFERENCES:
patent: 4543572 (1985-09-01), Tanaka et al.
patent: 5436635 (1995-07-01), Takahara et al.
patent: 5519414 (1996-05-01), Gold et al.
Luu Matthew
Piziali Jeff
Sun Microsystems Inc.
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