| 摘要 |
An input-output (I/O) protective circuit having more stable I/O protective function for use in the liquid crystal display device and including in one embodiment a resistance provided between an I/O terminal pad and an I/O primary stage thin film transistor, a wiring connecting the I/O terminal pad with the resistance, and two I/O protective thin film transistors connected in series between a ground terminal and a power source terminal. The above wiring is connected with each joint portion of the two I/O protective thin film transistors and, each of the two I/O protective thin film transistors has p-type substrate potential fixing terminals and n-type substrate potential fixing terminals, which are connected with each of the channel layers of the I/O protective thin film transistors, and p-type substrate potential fixing terminals and n-type substrate potential fixing terminals are connected with the ground terminals.
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