07-06-2012 дата публикации
Номер: US20120139440A1
The transistor suffers the variation caused in threshold voltage or mobility due to gathering of the factors of the variation in gate insulator film resulting from a difference in manufacture process or substrate used and of the variation in channel-region crystal state. The present invention provides an electric circuit having an arrangement such that both electrodes of a capacitance element can hold a gate-to-source voltage of a particular transistor. The invention provides an electric circuit having a function capable of setting a potential difference at between the both electrodes of the capacitance element by the use of a constant-current source. 1. A semiconductor device comprising:a pixel portion; and a shift register;', 'a first latch circuit operationally connected to the shift register;', 'a second latch circuit operationally connected to the first latch circuit;', 'a D/A converter circuit operationally connected to the second latch circuit; and', a first transistor;', 'a second transistor;', 'a first capacitor;', 'a second capacitor;', 'a first switch;', 'a second switch;', 'a third switch;', 'a fourth switch;', 'a fifth switch; and', 'a sixth switch,, 'a signal amplifier circuit operationally connected to the D/A converter circuit, the signal amplifier circuit comprising], 'a signal line drive circuit operationally connected to the pixel portion, the signal line drive circuit comprisingwherein a gate of the first transistor is electrically connected to one terminal of the first capacitor and one terminal of the sixth switch,wherein the other terminal of the first capacitor is electrically connected to one terminal of the first switch and one terminal of the second switch,wherein the other terminal of the second switch is electrically connected to one of a source and a drain of the first transistor, one of a source and a drain of the second transistor, one terminal of the third switch, and one terminal of the fourth switch,wherein the other of the source ...
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