Method and control circuit for controlling an emission current i

Details Method and control circuit for controlling an emission current i Method and control circuit for controlling an emission current i

1999-02-19

2000-05-09

Wong, Don

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315291, 315307, 345 74, G09G 310

Patent

active

060608404

ABSTRACT:
A method for controlling an emission current (134) in a field emission display (100) includes performing at start-up the steps of providing at an anode (138) a voltage less than an operating anode voltage, receiving emission current (134) at anode (138), concurrently measuring a power output of a power supply (146) connected to anode (138), and using the measured power output to adjust an offset voltage applied to a gate extraction electrode (126). A field emission display (100) includes a control circuit (111), which has a sensor (150), a current controller (154), and a gate voltage source (158). Sensor (150) is designed to be connected to power supply (146). Gate voltage source (158) is connected to gate extraction electrode (126) and applies thereto the offset voltage, which is manipulated by current controller (154) in response to an output signal (152) of sensor (150).

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