Drive device and drive method of light emitting display panel

摘要

The present invention is to provide a drive device which can efficiently collect electrical charges accumulated in the parasitic capacitances of light emitting elements so as to reduce power consumption in a light emitting display panel. Control is performed in such a manner that respective EL elements which become lighting objects are allowed to sequentially begin to be lit in response to a length of time determined in accordance with gradation control during a constant current drive period and that extinguishing timing of the respective light emitting elements which have received lighting control corresponds to the end of the lighting drive period. Thus, lighting time of the EL elements during the constant current drive period is controlled in accordance with gradation, and multi-gradation expression can be realized for each pixel. When the above-described gradation control method is adopted, regardless of the aspect of gradation control, electrical charges accumulated in the parasitic capacitances of the respective EL elements can be efficiently collected via all drive lines immediately after the completion of the constant current drive period.