Method and apparatus for discharging the output voltage of a DC

Details Method and apparatus for discharging the output voltage of a DC Method and apparatus for discharging the output voltage of a DC

1994-05-27

1996-11-05

Harvey, Jack B.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

345211, G06F 126

Patent

active

055727352

ABSTRACT:
A voltage discharge circuit discharges the voltage across a charge storage device, such as a capacitor, at an output of a power supply. The discharge circuit may be used, for example, in a contrast power supply for an LCD panel. The discharge circuit uses one or more switches to control the coupling between the output capacitor and a discharge element, such as a resistor. When the power supply is enabled, the discharge resistor is not coupled to the output capacitor, so that the discharge circuit does not significantly affect the operation of the power supply. When the power supply is disabled, the switches couple the discharge resistor to the output capacitor to discharge any accumulated voltage at a relatively fast rate. For a contrast power supply for an LCD display, a switching power supply is preferred.

REFERENCES:
patent: 3956609 (1976-05-01), Marendaz
patent: 4219872 (1980-08-01), Engelmann
patent: 4748444 (1988-05-01), Arai
patent: 5182810 (1993-01-01), Bartling et al.
Data Sheet, Maxim Integrated Products, MAX749, Digitally Adjustable LCD Bias Supply, pp. 4-149 to 4-159, May 1993.

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