Motorola Corporation

Kim A Hasler

Ken K Foo

David B Murray

A method for controlling an emission current ( ) in a field emission display ( ) includes measuring an emission current ( ), measuring a portion of the plurality of pixels receiving emission current ( ) as a percentage of the plurality of pixels on the anode ( ) to define a set point, comparing measured value to set point value and adjusting gate voltage to cause emission current to approach set point value. A field emission display ( ) includes a control circuit ( ), which has an analog-to-digital converter ( ), a current controller ( ), as display timing controller ( ) and a gate voltage source ( ). Analog-to-digital converter ( ) is designed to be connected to power supply ( ). Gate voltage source ( ) is connected to gate extraction electrode ( ) and applies thereto the offset voltage, which is manipulated by current controller ( ) in response to an output signal ( ) of analog-to-digital converter ( ) and an output signal of display timing controller ( ).

Method and circuit for controlling an emission current

A method for driving a field emission display (100) includes the steps of applying a drive signal (146) to an emission electrode (113) and manipulating the drive signal (146) using a feedback controller to control an electrode voltage signal (158) at the emission electrode (113). A field emission display (100) includes a field emission display device (110), a feedback controller (123), and a current source (120). The current source (120) is connected to an input (144) of the field emission display device (110). An output (131) of the feedback controller (123) is connected to an input (127) of the current source (120), and the input (144) of the field emission display device (110) is connected to the input (129) of the feedback controller (123).

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Chandler, AZ, United States of America

Kim A Hasler