Patent ID: 6424102
Filing Date: 2002-07-23
Classification: H01J,H04N

Abstract:
A picture display device comprising:a cathode ray tube having means for generating one or more electron beams, a display screen provided with index elements, and means for deflecting the electron beams across the display screen, receiving means for receiving signals generated by the index elements, and response means for controlling the deflection and/or shape of the electron beam(s) in response to the signals, â€ƒcharacterized in that the display screen comprises a first pattern comprising two first-pattern index elements of conducting material which are spaced from each other and electrically separated, and a second pattern comprising two second-pattern index elements of conducting material which are spaced from each other and electrically separated, and the picture display device is provided with a first coupling between the first pattern and the receiving means, and a second coupling between the second pattern and the receiving means.