| 摘要 |
PURPOSE: To substantially prevent shortage of the life of an EL element caused by accumulation of space charges in the EL element generating by repeating current driving. CONSTITUTION: In this EL display device having at least a hole transport layer and a luminescent layer between an anode and a cathode and emitting light by supplying a specified bias, a selecting circuit 2 for supplying voltage VBS higher than power source voltage supplying to the anode during driving and either one voltage of earthing voltage and negative voltage Vcd to the cathode is installed, and space charges accumulating in the element are periodically removed by applying reverse bias between the anode and the cathode during a non-display period.
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