ELECTRIC CIRCUIT, LATCH CIRCUIT, ELECTRIC CIRCUIT APPARATUS, DISPLAY APPARATUS, AND ELECTRONIC EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide a circuit which is operable with low power consumption and at a high frequency and resistant to a variation in characteristic of thin film transistors (TFTs) by forming a data reading circuit operable with a low voltage signal.

SOLUTION: In order to perform operations securely, a high potential power supply is connected to a gate electrode of a P-type TFT to which data signals are inputted in such a manner that the TFT receiving data signals is turned off as much as possible during a non-operating period. Similarly, a low potential power supply is connected to a gate electrode of an N-type TFT. Switch TFTs are provided between the high potential power supply and the P-type TFT and between the low potential power supply and the N-type TFT so as to turn the TFT off as required. Similarly, switch TFTs are provided between a data signal input terminal and a P-type TFT and between a data signal input terminal and an N-type TFT such that a data signal can be inputted thereto as required. The switching is controlled by using a latch signal and an inverse latch signal. Therefore, a latch circuit without a level shifter can be produced which can operate with stability.

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