| 摘要 |
A television received fop supplying video signals to a picture tube so as to display pictures on the screen in a first mode of the normal state and a second mode with the vertical amplitude expanded, includes, a vertical sawtooth waveform generator for generating sawtooth signals in a period corresponding to the vertical sync signals that are input to the vertical sawtooth waveform generator, an amplitude controller for switching amplitudes of the sawtooth signals from the vertical sawtooth waveform generator according to the first and the second modes and for expanding the amplitude in the second mode rather than the first mode, an inclination controller for making the inclination of the vertical sawtooth signal gentle at the timing corresponding to the end of the vertical scanning period in the second mode, and a brightness controller for controlling the brightness of the video signal corresponding to the end period of the vertical scanning to be decreased in the second mode.
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