Patent ID: 6288748
Filing Date: 2001-09-11
Classification: H04N

Abstract:
A display device comprising:a tuner which receives a signal-compressed digital broadcast signal;a decoder which decodes the signal-compressed digital broadcast signal received by the tuner and outputs video information containing at least a first field and a second field having mutually different numbers of scanning lines;a synchronizing signal generator which generates a horizontal synchronizing signal and a vertical synchronizing signal;a vertical ramp waveform generator which generates a vertical ramp waveform based on the vertical synchronizing signal;a cathode-ray tube, having a screen, which displays on the screen an image based on the video information output from the decoder;a vertical deflection coil which vertically scans at least one electron beam in the cathode-ray tube in accordance with the vertical ramp waveform; anda clamp circuit which sets respective vertical scanning start positions of the at least one electron beam on the screen of the cathode-ray tube for the first field and the second field to a same vertical scanning start position by clamping a voltage of the vertical ramp waveform during a vertical blanking interval in synchronism with the vertical synchronizing signal.