Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1996-10-11
1999-03-02
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
G09G 104
Patent
active
058775994
ABSTRACT:
A vertical and horizontal scanning correction system for generating vertical and horizontal scanning correction signals for an image display device which displays therewith an image having consistent vertical and horizontal image dimensions regardless of the vertical positioning thereof includes a vertical ramp generator and scanning correction circuit and a horizontal scanning correction circuit which are both controlled by a vertical position control signal and together maintain consistent vertical and horizontal image dimensions regardless of the vertical positioning thereof. The vertical ramp generator and scanning correction circuit includes a multiplier circuit which receives, processes and multiplies a ramp signal to produce a third order current signal component representing a third order product of the voltage ramp signal as part of the vertical scanning correction signal. The horizontal scanning correction circuit includes a signal rectifier and second and fourth order signal generators which, based upon the vertical ramp and scanning correction signal, generate a rectified signal and second and fourth order signals which represent second and fourth order products of the rectified signal. The vertical ramp and scanning correction signal and second and fourth order signals are individually scaled and combined in accordance with a set of gain control signals to produce the horizontal scanning correction signal.
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SGS-Thomson Microelectronics, TDA 9105, "Deflection Processor for Multisync Monitors", Oct. 1995, pp. 1/31--31/31.
Issing Gregory C.
National Semiconductor Corporation
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