Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yasuko Watanabe0
Hajime Kimura0
Date of Patent
June 29, 2010
Patent Application Number
12041042
Date Filed
March 3, 2008
Patent Primary Examiner
Patent abstract
A transistor has variation in a threshold voltage or mobility due to accumulation of factors such as variation in a gate insulating film which is caused by a difference of a manufacturing process or a substrate to be used and variation in a crystal state of a channel formation region. The present invention provides an electric circuit which is arranged such that both electrodes of a capacitance device can hold a voltage between the gate and the source of a specific transistor. Further, the present invention provides an electric circuit which has a function capable of setting a potential difference between both electrodes of a capacitance device so as to be a threshold voltage of a specific transistor.
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