A center balancing operation is proposed for a large area LCD backlight with the multi‐lamps driven by a single inverter. This new method minimizes the power leakage due to the parasitic capacitance of the backlight metal housing.

From the light propagation observed along the tube of CCFLs and EEFLs, the electron temperature and the plasma density are estimated as kT e~2 eV and n e~1 0 16 m -3 . This might be a new diagnostic technology to measure the plasma parameters in the fine tube of gas discharge.SID 07 DIGEST • 433 ISSN/007-0966X/07/3801-0433-$1.00 © 2007 SID

The circuit of the inverter has been analyzed with EEFL‐BLU for 32″ LCD‐TV. The analytic solutions of a lamp current and a lamp voltage are compared with the experimental data with respect to the impedance matching with the inductance and the reactance of lamp system.

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The plasma propagation has been investigated by observing the optical signal along the tube of the EEFL for 32″ LCD backlight unit. The light starting from the electrode of high voltage moves toward the other side of electrode grounded electrically with the electron plasma propagation speed about 4×105 m/s.