Method of generating independent top and bottom corners...

Details Method of generating independent top and bottom corners... Method of generating independent top and bottom corners...

2006-05-09

2006-05-09

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C315S003000, C315S370000

Reexamination Certificate

active

07042174

ABSTRACT:
A method and circuit for generating independent top and bottom corner correction using a single fourth order function is described. The top and bottom corner correction signal may be included in an east-west corrected voltage to correct an asymmetry of a picture with respect to a horizontal axis and a vertical axis of the picture. Two switch signals based on a ramping voltage, which is used to sweep an electron beam, and two clock signals control a sample-and-hold circuit. The sample-and-hold circuit is arranged to sample a fourth order voltage during a top portion and a bottom portion of the ramping voltage and provide two independent correction voltages Vout—topand Vout—bottom. The correction voltages are then provided for top and bottom corner correction to the east-west corrected voltage.

REFERENCES:
patent: 5247301 (1993-09-01), Yahagi et al.
patent: 5805022 (1998-09-01), Bruccoleri et al.
patent: 6449020 (2002-09-01), Salle et al.
patent: 6452366 (2002-09-01), Hwang
patent: 6628096 (2003-09-01), Chen
STMicroelectronics. TDAS9112 Low-Cost I2C Controlled Deflection Processor for Multisync Monitor. Aug. 2003. 26pp.

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