Apparatus and method for removing horizontal moire in...

Details Apparatus and method for removing horizontal moire in... Apparatus and method for removing horizontal moire in...

2005-01-25

2005-01-25

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C315S386000, C315S368170, C315S371000

Reexamination Certificate

active

06847176

ABSTRACT:
An apparatus and method for removing horizontal moire of a cathode-ray tube (CRT) monitor system, wherein horizontal moire can be completely removed even when the moire that occurs in an upper portion of the monitor is different from the moire that occurs in a lower portion of the monitor. In one aspect of the invention, a method for removing horizontal moire in a cathode ray tube (CRT) monitor comprises generating moire correction data in synchronization with a vertical synchronous signal, the moire correction data comprising a sawtooth waveform, adjusting one of a direct current (DC) component, an alternating current (AC) component, and both the DC and AC component, of the moire correction data, outputting the adjusted moire correction data for every other horizontal scan line in synchronization with an odd-numbered or an even-numbered horizontal synchronous signal, and delaying a horizontal drive signal in response to the output adjusted moire correction data.

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