Horizontal deflection s-shaped correction signal circuit with variable capacitance

摘要

A horizontal S-shaped correction signal circuit having a correction condenser disposed in a cathode ray tube (CRT) horizontal deflection circuit such as in a television receiver, a display monitor, etc. In particular, a horizontal S-shaped correction signal circuit which is capable of obtaining an accurate correction effect and a desired adjustment. The total capacitance of the correction condenser CS for a horizontal deflection circuit is variable by selectively connecting in parallel therewith correction condensers CS1 and CS2 by switches SW1 and SW2 during the scanning interval. Therefore, the correction characteristic is improved. Namely, it is possible to obtain a highly accurate S-shaped correction signal. In addition, it is possible to independently control the width of the front portion and rear portion of the horizontal scanning interval by controlling externally inputted direct control current signals DA-CTL1 and DA-CTL2. Furthermore, it is possible to vary the S-shaped correction signal width depending on the vertical scan position on the screen.