| 摘要 |
An electro-static discharge protection circuit for a liquid crystal display is disclosed. In response to positive electro-static charges being generated on the signal line, a thin film transistor with a gate electrode connected to the high level signal line is switched on, and the positive electro-static charges are discharged through the switched on thin film transistor. In addition, in response to negative electro-static charges being generated on the signal line, a thin film transistor with a gate electrode connected to the low level signal line is switched on, and the negative electro-static charges are discharged through the switched on thin film transistor. |
| 主权项 |
1. An electro-static discharge protection circuit for a liquid crystal display, wherein the liquid crystal display is provided with a signal line, a low level signal line and a high level signal line, and the electro-static discharge protection circuit comprises:
a first thin film transistor, wherein a drain/source electrode and a source/drain electrode of the first thin film transistor are respectively connected to the signal line and the low level signal line; a second thin film transistor, wherein a drain/source electrode and a source/drain electrode of the second thin film transistor are respectively connected to the signal line and the high level signal line; a third thin film transistor, wherein a drain/source electrode and a source/drain electrode of the third thin film transistor are respectively connected to the signal line and the low level signal line, and a high level signal is provided to a gate electrode of the third thin film transistor; and a fourth thin film transistor, wherein a drain/source electrode and a source/drain electrode of the fourth thin film transistor are respectively connected to the signal line and the high level signal line, and a low level signal is provided to a gate electrode of the fourth thin film transistor, wherein when positive electro-static charges are generated on the signal line, a voltage corresponding to the positive electro-static charges is higher than a voltage of the high level signal line, a thin film transistor with a gate electrode connected to the high level signal line is switched on, and the positive electro-static charges are discharged through the switched on thin film transistor, andwhen negative electro-static charges are generated on the signal line, a voltage corresponding to the negative electro-static charges is lower than a voltage of the low level signal line, a thin film transistor with a gate electrode connected to the low level signal line is switched on, and the negative electro-static charges are discharged through the switched on thin film transistor. |
