Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2007-08-07
2007-08-07
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140RC, C250S2140AG, C327S514000, C330S252000
Reexamination Certificate
active
10939998
ABSTRACT:
In an optical sensor device employing an amorphous silicon photodiode, an external amplifier IC and the like are required due to low current capacity of the sensor element in order to improve the load driving capacity. It leads to increase in cost and mounting space of the optical sensor device. In addition, noise may easily superimpose since the photodiode and the amplifier IC are connected to each other over a printed circuit board. According to the invention, an amorphous silicon photodiode and an amplifier configured by a thin film transistor are formed integrally over a substrate so that the load driving capacity is improved while reducing cost and mounting space. Superimposing noise can be also reduced.
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Koyama Jun
Maruyama Junya
Matsuzaki Takanori
Nishi Kazuo
Osada Takeshi
Epps Georgia
Lee Patrick J.
Semiconductor Energy Laboratory Co,. Ltd.
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