Method and apparatus for dimming a lamp in a backlight of a liqu

Details Method and apparatus for dimming a lamp in a backlight of a liqu Method and apparatus for dimming a lamp in a backlight of a liqu

1997-12-24

1999-08-17

Wong, Don

Electric lamp and discharge devices: systems

High frequency starting operation for fluorescent lamp

315209R, 315219, H05B 3702

Patent

active

059398302

ABSTRACT:
A method and apparatus for dimming a lamp in a backlight system of a display device, e.g., liquid crystal display ("LCD"), with a brightness dimming ratio of 10,000:1, which is a factor of 10 better than conventional dimming devices. A switch is provided in an inverter circuit, which has reactive components, that drives the lamp. The is positioned in the inverter circuit such that, when it is closed, the energy stored within the reactive components of the inverter circuit is discharged to ground. In one embodiment, the signals from the power supply are pulse width modulated.

REFERENCES:
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patent: 4998045 (1991-03-01), Ruby et al.
patent: 5027034 (1991-06-01), Ruby et al.
patent: 5105127 (1992-04-01), Lavaud et al.
patent: 5428265 (1995-06-01), Booth, Jr. et al.
patent: 5491387 (1996-02-01), Saito

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