Method and apparatus for dimming a lamp in a backlight of a liquid crystal display
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Dec 24, 1997
filing date -
Dec 24, 1997
priority date (Note) -
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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.
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