Importance

Loading Importance Indicators...

Abstract

A method and circuit for digitally controlled vertical C linearity correction with constant start and end points without using an AGC. A squared voltage and a negative squared voltage are added as a correction voltage to a sawtooth-shaped ramping voltage that is employed to sweep an electron beam across a display. Line spacing toward the edges of a screen are maintained equal as a result enabling a uniform presentation of a picture on a non-spherical display. A digitally controlled attenuator determines a correction coefficient for correction voltages. The correction voltage is also processed by a sample-and-hold circuit to obtain a peak squared voltage. The peak squared voltage is then compared to a DC reference voltage and an offset adjustment current determined, based on a result of the comparison. The correction voltage is then added to the ramping voltage, which is also shifted by the offset amount.

Loading the Abstract Image...

First Claim