Capacitive charge driver circuit for flat panel display

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

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345 74, G09G 330

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active

057422672

ABSTRACT:
A driver circuit for driving the emitters of a flat panel display such as a field emission display. The driver circuit includes a capacitor and a charge circuit. The capacitor is connected between the emitter and an extraction grid held at a constant potential. The charge circuit has two inputs respectively connected to a row line and a column line. The charge circuit also has a charge terminal connected to the capacitor. In operation, the charge circuit applies at the charge terminal a selected voltage level which is below the grid voltage. The selected voltage level represents the intensity of the pixel associated with the emitter. In response to the selected voltage level at the charge terminal, the extraction grid charges the capacitor to a potential which is the difference between the grid voltage and the selected voltage level. When charged, the capacitor is isolated from the driver circuit. The charge stored in the isolated capacitor discharges through the emitter. In a preferred embodiment of the invention, the charge circuit includes a pair of diodes that drive the emitter. Because diodes are much easier to fabricate than transistors and they exhibit very stable and reproducible electrical characteristics, the driver circuit provides the advantages of low cost, high manufacturing yield and high reliability.

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Yaniv et al., "A New Amorphous-Silicon Alloy Pin Liquid-Crystal TV Display," SID International Symposium Digest of Technical Papers, New York, May 1986, pp. 278-280.
Vijan et al., "High-Performance Amorphous-Silicon Alloy PIN Active-Matrix LCD for Military and Avionic Applications," SID International Symposium Digest of Technical Papers, New York, 1987, pp. 159-160.

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