06069597 is referenced by 121 patents and cites 20 patents.

A circuit and method for controlling the brightness of a display screen implemented using a flat panel field emission display (FED) screen. Within the FED screen, a matrix of rows and columns is provided and emitters are situated within each row-column intersection. Rows are activated sequentially and separate gray scale information is presented to the columns. When the proper voltage is applied across the cathode and anode of the emitters, they release electrons toward a phosphor spot, e.g., red, green, blue, causing an illumination point. The present invention includes brightness control circuitry positioned across the row drivers for altering the applied voltage to the rows causing a change in brightness cross the FED screen. The applied voltage can be pulse width modulated or amplitude modulated to alter the brightness of the FED screen. Because the relative column voltages remain constant within the present invention, gray scale resolution is not compromised as brightness is altered. Within one FED screen implementation, it is more efficient to alter the row voltage; however, in an alternative embodiment of the present invention the column voltages are modulated in amplitude or pulse width to alter the brightness of the FED screen. The brightness circuitry of the present invention can be made responsive to a manual brightness knob or can be responsive to an ambient light sensor.

Title
Circuit and method for controlling the brightness of an FED device
Application Number
8/920552
Publication Number
6069597
Application Date
August 29, 1997
Publication Date
May 30, 2000
Inventor
Ronald L Hansen
San Jose
CA, US
Agent
Wagner Murabito & Hao
Assignee
Candescent Technologies Corporation
CA, US
IPC
G09G 3/22
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