Semiconductor Energy Laboratory Co., Ltd.

Jun Koyoma

Shunpei Yamazaki

Kiyoshi Kato

Toshimitsu Konuma

Kunitaka Yamamoto

An object of the present invention is to provide an EL display device, which has a high operating performance and reliability. A third passivation filmis disposed so as to be in contact with an EL elementwhich comprises a pixel electrode (anode), an EL layerand a cathode, to make a structure in which heat generated by the EL elementis radiated. Further, the third passivation filmprevents alkali metals within the EL elementfrom diffusing into the TFTs side, and prevents moisture and oxygen of the TFTs side from penetrating into the EL element. More preferably, heat radiating effect is given to a fourth passivation filmto make the EL elementto be enclosed by heat radiating layers.

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Kanagawa, Japan

Jun Koyoma