Controlling pixel brightness in a field emission display using c

Details Controlling pixel brightness in a field emission display using c Controlling pixel brightness in a field emission display using c

1996-04-24

1999-01-05

Nguyen, Chanh

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 77, G09G 322

Patent

active

058568123

ABSTRACT:
A flat panel display, such as a Field Emission Display ("FED"), is disclosed having a current control circuit. Input into the display, initially, is an analog signal having an amplitude. In one embodiment, the current control circuit includes a converter for converting the analog input signal to a sawtooth signal having a height and width. Then, the level of the sawtooth signal is compared to a voltage level to establish a pulse width of an emitter current. The emitter current is thus controlled by a pulse width modulation approach. In another embodiment, the current control circuit traps a column voltage on a parasitic capacitance. The trapped voltage then controls the gate of a transistor to control current flow from the emitter set to ground.

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