Patent Number: 7,786,544

Title: Area sensor and display apparatus provided with an area sensor

Abstract: An area sensor of the present invention has a function of displaying an image in a sensor portion by using light-emitting elements and a reading function using photoelectric conversion devices. Therefore, an image read in the sensor portion can be displayed thereon without separately providing an electronic display on the area sensor. Furthermore, a photoelectric conversion layer of a photodiode according to the present invention is made of an amorphous silicon film and an N-type semiconductor layer and a P-type semiconductor layer are made of a polycrystalline silicon film. The amorphous silicon film is formed to be thicker than the polycrystalline silicon film. As a result, the photodiode according to the present invention can receive more light.

Inventors: Yamazaki; Shunpei (Tokyo, JP), Koyama; Jun (Kanagawa, JP), Yonezawa; Masato (Kanagawa, JP), Kimura; Hajime (Kanagawa, JP), Yamazaki; Yu (Tokyo, JP)

Assignee: Semiconductor Energy Laboratory Co., Ltd.

International Classification: H01L 31/105 (20060101)

Expiration Date: 8/31/12018