Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-03-16
1991-10-29
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315383, 315371, G09G 104, H01J 2970, H01J 2956
Patent
active
050618806
ABSTRACT:
A method of driving an image display device is disclosed in which electron beams from line cathodes are impinged upon a display screen through beam modulating and deflecting electrodes to display an image. Each beam roughly lands onto a predetermined position on the screen by a stepped deflection voltage waveform to form a spot on the screen while the beam is deflected around the predetermined position by an unstepped deflection voltage waveform. The timing of application or the pulse width of a driving pulse signal for the beam modulating electrode is controlled in a form temporally related to the driving of the beam deflecting electrode to control the landing position or diameter of the spot on the screen. In the case where the driving pulse signal is a signal the pulse width of which is modulated by a video signal, the pulse width is changed in accordance with the level of the video signal and equally in positive and negative directions around the instant of time when a signal pulse having the minimum width necessary for representation as an image is to be generated.
REFERENCES:
patent: 3440480 (1969-04-01), Henderson
patent: 3449620 (1969-06-01), Caron et al.
patent: 4127796 (1978-11-01), Henderson
patent: 4227117 (1980-10-01), Watanabe et al.
Hamada Kiyoshi
Hashiguchi Jumpei
Kitao Satoshi
Nonomura Kinzo
Takahashi Masayuki
Issing Gregory C.
Matsushita Electric - Industrial Co., Ltd.
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