Digitally controlled vertical C linearity correction with...

Details Digitally controlled vertical C linearity correction with... Digitally controlled vertical C linearity correction with...

2006-02-07

2006-02-07

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C315S399000, C315S411000

Reexamination Certificate

active

06995526

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.

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STMicroelectronics. TDAS9112 Low-Cost I2C Controlled Deflection Processor for Multisync Monitor. Aug. 2003. 26pp.

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