Semiconductor junction breakdown tap for a field emission displa

Details Semiconductor junction breakdown tap for a field emission displa Semiconductor junction breakdown tap for a field emission displa

1996-11-20

1998-09-29

Pascal, Robert J.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

345 74, 345204, G09G 312

Patent

active

058149465

ABSTRACT:
A field emission display includes a discrete storage capacitor coupled between a column line and a reference potential. The display also includes a discharge circuit coupled between a transmission line tap and the storage capacitor. The discharge circuit receives an image signal from the transmission line and transfers charge from the transmission line to the storage capacitor. In one embodiment, the discharge circuit includes a pair of opposed zener diodes. In response to a brief negative-going input pulse on the transmission line, the capacitor is discharged through the diodes. Then, the diodes recover and capacitor and column line are isolated from the tap. A selected line of an extraction grid is then activated to extract electrons from an emitter set coupled to the column line. The voltage differential between the extraction grid and the emitter set extracts electrons from the emitter set that are replaced by the capacitor. The capacitor has sufficient capacitance to supply electrons over an expected refresh interval of the column line. Therefore, the voltage of the capacitor remains substantially constant over the refresh interval. Because the capacitor can be charged quickly, the input pulse can be short relative to the refresh interval.

REFERENCES:
patent: 4427266 (1984-01-01), Hosokawa
patent: 5404081 (1995-04-01), Kane et al.
patent: 5519414 (1996-05-01), Gold et al.
patent: 5537007 (1996-07-01), Harberts et al.
patent: 5627556 (1997-05-01), Kwon et al.

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