Shift register unit, driving method thereof, shift register and display device
AssigneesBoe Technology Group Co., Ltd., Chengdu Boe Optoelectronics Technology Co., Ltd.
InventorsWen Tan, Xiaojing Qi
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Abstract
Embodiments of the present invention provides a shift register unit, driving method thereof, a shift register and a display device. A switch-off module is provided to disconnect electrical connections between a pull-up node and a precharge module and between the pull-up node and a pull-down module at a pull-up stage. As a result, it is able to prevent excessive electric leakage of a GOA circuit, thereby to improve the reliability and power consumption of the GOA circuit with an Oxide TFT.
Claims17
A shift register unit comprising a first capacitor, a pull-up module, a precharge module and a pull-down module, a first end of the first capacitor being coupled to the pull-up module at a pull-up node, the shift register unit further comprising:
- a switch-off module coupled to the pull-up node and to a first node located between the precharge module and the pull-down module, configured to disconnect electrical connections (i) between the pull-up node and the precharge module and (ii) between the pull-up node and the pull-down module at a pull-up stage,
- wherein the switch-off module comprises:
- a first TFT, a source electrode of the first TFT is coupled to the first node, a gate electrode of the first TFT is coupled to a second clock signal input, and a drain electrode of the first TFT is coupled to the pull-up node;
- and
- a switch-off controlling unit configured to control a source voltage of the first TFT at the pull-up stage so as to enable the first TFT to be in a fully off state, thereby to disconnect the electrical connections (i) between the pull-up node and the precharge module and (ii) between the pull-up node and the pull-down module.
A shift register unit comprising:
- a first capacitor, a pull-up module, a precharge module, and a pull-down module, a first end of the first capacitor being coupled to the pull-up module at a pull-up node, the shift register unit further comprising:
- a switch-off module coupled to the pull-up node and to a first node located between the precharge module and the pull-down module, configured to disconnect electrical connections (i) between the pull-up node and the precharge module and (ii) between the pull-up node and the pull-down module at a pull-up stage;
- wherein the switch-off module comprises:
- a first TFT, a second TFT, and a third TFT,
- wherein:
- a source electrode of the first TFT is coupled to a drain electrode of the second TFT and a drain electrode of the third TFT, a gate electrode of the first TFT is coupled to a second clock signal input, and a drain electrode of the first TFT is coupled to the pull-up node;
- a source electrode of the second TFT is coupled to the pull-up module and the pull-down module, and a gate electrode of the second TFT is coupled to a first clock signal input;
- and
- a source electrode of the third TFT is coupled to the first node, and a gate electrode of the third TFT is coupled to the second clock signal input.
Dependencies are inferred from the claim text.