Protection circuit for input and output of liquid crystal display
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United States of America Patent
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-
Nov 21, 2006
Issued Date -
N/A
app pub date -
Mar 26, 2003
filing date -
Mar 29, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided an input-output (I/O) protective circuit having more stable I/O protective function for use in the liquid crystal display device.An IO protective circuit includes: a resistance 13 provided between an I/O terminal pad 11 and an I/O primary stage thin film transistor 12, a wiring connecting the I/O terminal pad 11 with the resistance 13, and two I/O protective thin film transistors 14 connected in series between a ground terminal 20 and a power source terminal 21. The above wiring is connected with each joint portion of the two I/O protective thin film transistors 14 and 15, each of the two I/O protective thin film transistors 14, 15 has p-type substrate potential fixing terminals 16, 18 and n-type substrate potential fixing terminals 17, 19, which are connected with each of the channel layers of the I/O protective thin film transistors 14, 15, and p-type substrate potential fixing terminals 16, 18 and n-type substrate potential fixing terminals 17, 19 are connected with the ground terminals 20.
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