Horizontal deflection S-shaped correction signal circuit with va

Details Horizontal deflection S-shaped correction signal circuit with va Horizontal deflection S-shaped correction signal circuit with va

1997-11-21

1999-09-21

Westin, Edward P.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H04N 3233

Patent

active

059558482

ABSTRACT:
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 C.sub.S for a horizontal deflection circuit is variable by selectively connecting in parallel therewith correction condensers C.sub.S1 and C.sub.S2 by switches SW.sub.1 and SW.sub.2 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-C.sub.TL1 and DA-C.sub.TL2. Furthermore, it is possible to vary the S-shaped correction signal width depending on the vertical scan position on the screen.

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