| 摘要 |
PURPOSE:To enable excellent luminance adjustment, by transmitting the luminance signal adjustable within the horizontal blanking period as video signal. CONSTITUTION:The variable resistor 8 for luminance adjustment is inserted between the power supply terminals 7 and 5, and the slider 8a is connected to the operational amplifier 11. The output of the amplifier 11 is fed to the gate of FET13 via the gate circuit 12 conducting the horizontal blanking period. The luminance signal is superimposed on the video signal input to the terminal 1 at TR3 via the transistor TR17. The superimposed signal is fed to the clamp circuit 23 via the amplifier circuit 20 and TR21. Further, the signal corresponding to the horizontal blanking period is given to the terminal 23d, the luminance signal is transmitted at the first and the last of the said period, and video signal is appeared at the output terminal 26 as it is outside the horizontal blanking period. |
