| abstract |
A contact type image sensor is disclosed, wherein an illumination source having a thin film light emitting element is opposed to a sensor section having thin film photo sensitive elements, a transparent substrate being disposed therebetween. The thin film light emitting element is so-called an organic thin film EL element, which comprises an anode, a hole transport thin film, an electron transport organic fluorescent thin film, and a cathode. Since the organic thin film EL element can be driven at a low DC voltage, it decrease the fluctuation of the intensity of the illumination light, resulting in remarkably imprving the reading accuracy of an image. In addition, the thin film light emitting element can be operated with a small amount of power. Moreover, it can be thinly structured. |