Computer graphics processing and selective visual display system – Data responsive crt display control
Patent
1998-06-16
2000-09-05
Wu, Xiao
Computer graphics processing and selective visual display system
Data responsive crt display control
345 13, 345 22, 345150, 345213, 315370, G09G 106
Patent
active
061150096
ABSTRACT:
A display device using a video signal counter system in its automatic positioning and centering circuit. The display device receives a video signal (e.g., from a host computer) including red, green, blue (RGB) color signals and synchronization signals. The present invention advantageously utilizes a video signal counter circuit which is located proximate to, and on the same integrated circuit PC board as, the video receiver circuit of the display device to increase the accuracy of automatic centering and sizing computations. The video signal counter circuit compares horizontal and vertical synchronization signals to the start of the picture edge as determined by the RGB signals. The video signal counter circuit communicates over a transmission line (e.g., serial line) to a processor unit located on another integrated circuit PC board. The processor unit uses the signals generated by the video signal counter circuit to perform automatic sizing and centering computations and generates, as output, vertical and horizontal sizing and vertical and horizontal centering signals. These signals are supplied to a yoke controller/driver circuit which drives the deflection circuitry of a cathode ray tube (CRT) type display unit. By positioning the video signal counter circuit on the same PC board as the receiver unit, signal jitter and EMI noise problems are reduced. The transmission line between the video signal counter circuit and the microprocessor can be shielded thereby further reducing EMI noise. Noise is reduced again by positioning the microprocessor on the same PC board as the yoke driver circuit.
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Sony Corporation of Japan
Sony Electronics Inc.
Wu Xiao
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