Shift register circuit and display panel using the same
AssigneeHkc Corporation Limited
InventorJianfeng SHAN
Life of this patent
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Abstract
A shift register comprises: a first switch electrically coupled to a control signal, and to a first node; a second switch electrically coupled to the first node, to a frequency signal, and to a first output signal; a third switch electrically coupled to a second output signal, to the first output signal, and to a low predetermined voltage level; a fourth switch electrically coupled to a second node, to the first node, and to the low predetermined voltage level; a fifth switch electrically coupled to the first node, to the frequency signal, and to a third node; and a pull-down control circuit electrically coupled to the frequency signal, the low predetermined voltage level and the second node.
Claims20
A shift register circuit, comprising a plurality of shift registers, wherein each shift register comprises:
- a first switch including a control end and a first end electrically coupled to a control signal, and a second end electrically coupled to a first node;
- a second switch including a control end electrically coupled to the first node, a first end electrically coupled to a frequency signal, and a second end electrically coupled to a first output signal;
- a third switch including a control end electrically coupled to a second output signal, a first end electrically coupled to the first output signal, and a second end electrically coupled to a low predetermined voltage level;
- a fourth switch including a control end electrically coupled to a second node, a first end electrically coupled to the first node, and a second end electrically coupled to the low predetermined voltage level;
- a fifth switch including a control end electrically coupled to the first node, a first end electrically coupled to the frequency signal, and a second end electrically coupled to a third node;
- and
- a pull-down control circuit electrically coupled to the frequency signal, the low predetermined voltage level and the second node.
A shift register circuit comprising a plurality of shift registers, wherein each shift register comprises:
- a first switch including a control end and a first end electrically coupled to a control signal, and a second end electrically coupled to a first node;
- a second switch including a control end electrically coupled to the first node, a first end electrically coupled to a frequency signal, and a second end electrically coupled to a first output signal;
- a third switch including a control end electrically coupled to a second output signal, a first end electrically coupled to the first output signal, and a second end electrically coupled to a low predetermined voltage level;
- a fourth switch including a control end electrically couple to a second node, a first end electrically coupled to the first node, and a second end electrically coupled to the low predetermined voltage level;
- a fifth switch including a control end electrically coupled to the first node, a first end electrically coupled to the frequency signal, and a second end electrically coupled to a third node;
- and
- a pull-down control circuit comprising:
- a sixth switch including a control end and a first end electrically coupled to the second output signal, and a second end electrically coupled to the second node;
- seventh switch including a control end electrically coupled to a fourth node, a first end electrically coupled to the second node, and a second end electrically coupled to the low predetermined voltage level;
- and
- a first capacitor electrically coupled to the frequency signal and the second node;
- wherein an operation status of the fourth switch is controlled and an interference signal of the shift register is eliminated through the pull-down control circuit.
A display panel comprising a shift register circuit, the shift register circuit comprising a plurality of shift registers, wherein each shift register comprises:
- a first switch including a control end and a first end electrically coupled to a control signal, and a second end electrically coupled to a first node;
- a second switch including a control end electrically coupled to the first node, a first end electrically coupled to a frequency signal, and a second end electrically coupled to a first output signal;
- a third switch including a control end electrically coupled to a second output signal, a first end electrically coupled to the first output signal, and a second end electrically coupled to a low predetermined voltage level;
- a fourth switch including a control end electrically coupled to a second node, a first end electrically coupled to the first node, and a second end electrically coupled to the low predetermined voltage level;
- a fifth switch including a control end electrically coupled to the first node, a first end electrically coupled to the frequency signal, and a second end electrically coupled to a third node;
- and
- a pull-down control circuit electrically coupled to the frequency signal, the low predetermined voltage level and the second node.
Dependencies are inferred from the claim text.