Patent ID: 6534928
Filing Date: 2003-03-18
Classification: H05B

Abstract:
A method for driving a cold cathode flat fluorescent lamp (CCFFL), wherein a driver apparatus for the CCFFL is composed of a power supply, a signal-generating unit, and an inverter driver circuit, comprising the steps of:generating a pulse-combined signal having a plurality of pulse signals, wherein each of the plurality of pulse signals has a pulse width and a pulse period; applying the pulse-combined signal to the inverter driver circuit, wherein the inverter driver circuit has a pair of output terminals, which are electrically connected to a pair of input terminals of the CCFFL so as to input a control signal to the CCFFL to light it up; adjusting the pulse width and the pulse period, so that the CCFFL can be at a first luminance while a first luminance uniformity thereof is at a substantially maximum level; setting the pulse width and the pulse period so that the CCFFL is at the first luminance and have the first luminance uniformity; and generating the pulse-combined signal having a turn-off time that allows the CCFFL to be at a second luminance and to have a second luminance uniformity; wherein the second luminance uniformity is substantially equal to the first luminance uniformity.