Patent ID: 7236148

Claim:
A drive method of a light-emitting display panel including light-emitting elements whose lighting is respectively controlled through constant current circuits, in which said constant current circuits supply constant currents to said light-emitting elements, making use of a voltage output from a drive voltage source; and the voltage output from said drive voltage source is controlled based on forward direction voltages of the light-emitting elements, wherein when controlling the voltage output from said drive voltage source, said forward direction voltages are sampled at the timing at which constant currents are supplied from said constant current circuits to the light-emitting elements, so as to obtain said forward direction voltages by a sampling/hold circuit for holding the sampled voltage values, and sampling/hold operation by means of said sampling/hold circuit is carried out such that intervals of the sampling/hold are shorter than said intervals in an ordinary operation being a period except when said light-emitting display panel starts to be lit or when light emission luminance of said light-emitting display panel is changed according to a lighting drive condition of said light-emitting elements.