Apparatus and method for modulating a flat panel display device

Details Apparatus and method for modulating a flat panel display device Apparatus and method for modulating a flat panel display device

G - Physics

06

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375/47

G06F 3/14 (2006.01) G09F 9/00 (2006.01) G09G 1/20 (2006.01) H01J 31/08 (2006.01) H01J 31/12 (2006.01) H04N 3/12 (2006.01)

Patent

CA 1074932

APPARATUS AND METHOD FOR MODULATING A FLAT PANEL DISPLAY DEVICE Abstract A flat panel display device has a cathodoluminescent screen which is bombarded by a flow of electrons. The screen becomes electrically charged due to the electron bombardment. The charge striking various points on the screen is directly related to the image brightness at those points. The flow of electrons to each point is modulated by sensing the electrical charge which strikes the screen's surface at each point and comparing it to the image brightness signal for the display. When a predetermined relationship between the charge and the signal exists, indicating that the proper brightness level has been reached, the electron flow is terminated. The sensing system may be multiplexed to reduce its complexity. -1-

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