The timing data acquisition expedient which acquires the timing

摘要

This invention relates to a suitable video display devices applied to multi-scan monitor or the like. Video signal measurement circuit (16), I detect the vertical sync frequency fV and fH horizontal sync frequency from (21) the input video signal. For example, the signal (21) corresponds to the GTF standard. (11), calculates the timing data using frequency fH, and fV, according to the waveform signal (21), calculates the adjustment parameters such as size and position by using the timing data, the adjustment parameter main controller is set to (14, 15) deflection control circuit, CRT (20), image display according to the signal (21) is to be performed satisfactorily. In order to calculate the timing data using the synchronization frequency fH signal (21), and fV, it can well, thereby saving memory capacity even without first storing timing data corresponding to the video signals of a plurality of types.