Wintest Corporation

Tomoharu Innami

Masatoshi Itoh

Makoto Ookuma

Shouji Nara

It is an object of the present invention to provide an apparatus and method for evaluating an organic EL display, with which there is a simple drive circuit used for testing an organic EL display , evaluation of high reliability can be achieved, and an evaluation of the organic EL display itself is performed prior to the installation of finished product drive circuits to the organic EL display , which makes it possible to suppress the decrease in yield caused by dealing with defective products due to the evaluation results. It was noticed that if the drive (testing) of a pixel is performed during the discharge of the previous pixel after the supply of drive current to that previous pixel , and if the difference between the drive current and discharge current values of the organic EL pixel of the pixel is under a specific level, then it is possible to decide that the pixels constituted by the various organic EL elements are operating normally, and the present invention is characterized in that pixel defects are detected by detecting the difference between drive current and discharge current values for every pixel constituted by an organic EL element

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Kanagawa Prefecture, Japan

Tomoharu Innami