Abstract: A gamma correction circuit is provided with a first circuit including a first linear element and a first non-linear element connected in series in the above order and a second circuit including a second non-linear element and a second linear element connected in series in the above order. A first connection point is located between the first linear element and the second non-linear element and a second connection point is located between the first non-linear element and the second linear element. A current source for converting a video signal voltage into a current output is connected to the second connection point. Two common collector (or common drain) transistors have their collectors (or their drains) connected to a power supply line.

Abstract: A horizontal deflection circuit comprises a horizontal oscillator circuit, a drive transistor, a horizontal output transistor driven by the output of the drive transistor, a timing circuit for setting a timing delayed by about one fourth the horizontal scanning period from the terminating point of the flyback pulse generated at the collector of the horizontal output transistor, a phase difference detector circuit for detecting the phase difference between the leading edge of the collector pulse of the horizontal drive transistor and the timing set by the timing circuit, and a pulse duration variable output circuit triggered by the output of the horizontal oscillator circuit and with the output pulse duration thereof controlled by the output of the phase difference detector circuit.

Abstract: A capacitor is provided between each cathode of a three-electron-gun color picture tube with three first grids earthed and each transistor amplifier for amplifying each primary color signal. The charging voltage across each capacitor is adjusted by a variable resistor provided corresponding to each capacitor. A variable DC voltage is produced at the sliding terminal of each variable resistor. A switch is provided between the sliding terminal and each cathode, which is turned on during the flyback period and the scanning period.