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Abstract

A drive circuit is provided in an active type electroluminescence (EL) display device including a plurality of EL elements (20). Each EL element is composed of a plurality of anodes (201) separately formed corresponding to each pixel, a cathode (202) commonly formed for the plurality of anodes, and an emissive layer (45) interposed between the anodes and the cathode. The EL elements are driven by TFTs 24 connected between the plurality of anodes provided for each pixel and a power source voltage (Vdd). The drive circuit comprises a current detector circuit (2) for detecting the current flowing from the cathode and for generating an output voltage corresponding to the detected current, a voltage inverting amplifier circuit (3) for inverting and amplifying the output voltage, and a current amplifier circuit (4) for performing current amplification of the output from the voltage inverting amplifier circuit. The drive circuit operates to increase or decrease the power source voltage (Vdd) in accordance with the current flowing from the cathode. With this arrangement, images having optimal contrast according to the number of light-emitting pixels can be displayed while power consumption is reduced.

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First Claim