Method and apparatus for improving the sharpness of a video...

Details Method and apparatus for improving the sharpness of a video... Method and apparatus for improving the sharpness of a video...

H - Electricity

04

N

350/103

H04N 3/32 (2006.01) H01J 29/56 (2006.01)

Patent

CA 1092703

METHOD AND APPARATUS FOR IMPROVING THE SHARPNESS OF A VIDEO PICTURE ABSTRACT OF THE DISCLOSURE A method and apparatus for improving the sharpness of a video picture displayed on the screen of a cathode ray tube. At least one electron beam scans the screen in line-scanning and vertical directions, respectively, the electron beam having its intensity modulated in accordance with a video signal. The scanning velocity of the electron beam is modulated in the line- scanning direction in accordance with transitions of the video signal which correspond to transitions between high and low brightness levels of the displayed video picture. The electron beam is shaped to have a substantially oval shape whose longer axis is disposed in the line-scanning direction and whose shorter axis is disposed in the vertical direction, whereby the oval- shaped beam impinges upon the display screen. -i-

291906

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