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US 8,619,070 B2Granted
Gate drive circuit and display apparatus having the same
AssigneeSamsung Display Co., Ltd.
InventorsHong-Woo Lee, Eung-Gyu Lee, Jong-Hwan Lee, Sung-Man Kim
Life of this patent
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Abstract
An n-th stage (wherein, n is an integer) of the stages of a gate driving circuit includes a pull-up part, a first variable mode part and a second variable mode part. At least one of the first and second variable mode parts includes a variable element. The variable element comprises a first thin-film transistor (TFT) turned on in response to a first level voltage of the first or second direction signal, a second TFT applying the first or second direction signal to a control part of the pull-up part in response to an output signal of a previous stage or an output signal of a next stage, and a third TFT connected to the second TFT through the first TFT.
Claims18
A gate driving circuit including a plurality of stages cascade-connected to each other and each outputting a respective one of a plurality of gate signals, an n-th stage (wherein, n is an integer) of the stages comprising:
- a pull-up part outputting a first voltage of a first clock signal as an output signal of the n-th stage in response to an input voltage;
- a first variable mode part applying a first direction signal to a control part of the pull-up part in response to a vertical start signal or an output signal of a previous one of the stages;
- and
- a second variable mode part applying a second direction signal to the control part of the pull-up part in response to the vertical start signal or an output signal of a next one of the stages, the second direction signal being different from the first direction signal,
- wherein at least one of the first and second variable mode parts includes a variable element, and the variable element comprises:
- a first thin-film transistor (TFT) turned on in response to a first level voltage of the first or second direction signal;
- a second TFT applying the first or second direction signal to the control part of the pull-up part in response to the output signal of a previous one of the stages or the output signal of a next one of the stages;
- and
- a third TFT connected to the second TFT through the first TFT, and applying the first or second direction signal to the control part of the pull-up part in response to the output signal of a previous one of the stages or the output signal of a next one of the stages;
- wherein when the first direction signal is applied to the first variable mode part, the second direction signal is applied to the second variable mode part, the first direction signal has the first level voltage, and the second direction signal has a second level voltage that is lower than the first level voltage, the n stages are driven in a first direction;
- and
- wherein when the second direction signal is applied to the first variable mode part, the first direction signal is applied to the second variable mode part, the first direction signal has the first level voltage, and the second direction signal has the second level voltage, the n stages are driven in a second direction opposite to the first direction.
9 more elements
A display apparatus comprising:
- a display panel including a display area and a peripheral area surrounding the display area, the display area for displaying an image, gate and source lines being formed at least partially in the display area;
- a gate driving circuit integrated in the peripheral area and including a plurality of stages outputting gate signals to their respective gate lines;
- and
- a main driving circuit providing a first direction signal and a second direction signal to the gate driving circuit according to a direction of an image to be displayed on the display panel, the second direction signal being different from the first direction signal,
- an n-th stage (wherein n is an integer) of the stages comprising:
- a pull-up part outputting a first voltage of a first clock signal as an output signal of the n-th stage in response to an input voltage;
- a first variable mode part applying a first direction signal to a control part of the pull-up part in response to a vertical start signal or an output signal of a previous one of the stages;
- and
- a second variable mode part applying a second direction signal to the control part of the pull-up part in response to the vertical start signal or an output signal of a next one of the stages,
- wherein at least one of the first and second variable mode parts includes a variable element, and the variable element comprises:
- a first TFT turned on in response to a first level voltage of the first or second direction signal;
- a second TFT applying the first or second direction signal to the control part of the pull-up part in response to the output signal of a previous one of the stages or the output signal of a next one of the stages;
- and
- a third TFT connected to the second TFT through the first TFT, and applying the first or second direction signal to the control part of the pull-up part in response to the output signal of a previous one of the stages or the output signal of a next one of the stages;
- wherein when the first direction signal is applied to the first variable mode part, the second direction signal is applied to the second variable mode part, the first direction signal has the first level voltage, and the second direction signal has a second level voltage that is lower than the first level voltage, the n stages are driven in a first direction;
- and
- wherein when the second direction signal is applied to the first variable mode part, the first direction signal is applied to the second variable mode part, the first direction signal has the first level voltage, and the second direction signal has the second level voltage, the n stages are driven in a second direction opposite to the first direction.
14 more elements
Dependencies are inferred from the claim text.