| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve a problem in which a display device can not be made small-sized and thin since the number of components and the cost can not be decreased although another module manufactured in another process is built in the same housing when an optical sensor is provided to the display device. <P>SOLUTION: The optical sensor is realized by using a TFT provided on an insulating substrate. A photocurrent generated when external light is incident while the TFT is OFF is detected and used as the optical sensor. A semiconductor of only the optical sensor is annealed twice by using a laser to have a larger mean crystal particle size than a semiconductor layer of a display part or light emitting element, thereby improving crystal characteristics. Consequently, the generation efficiency of the photocurrent of the optical sensor can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
