Gate driver having a plurality of first stages and second stages for driving a display device and driving method thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsSung-Man Kim, Bong-Jun Lee, Hong-Woo Lee
Life of this patent
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Abstract
In a gate driver of a display device, a plurality of first stages each transmit a first gate signal having a first gate-on voltage to first gate lines, and a plurality of second stages each transmit a second gate signal having a second gate-on voltage to second gate lines and output a carry signal corresponding to the second gate signal. Each first stage outputs the first gate-on voltage based on a third gate-on voltage of the carry signal from a previous second stage, and each second stage outputs the second gate-on voltage based on the third gate-on voltage of the carry signal from the previous second stage.
Claims25
A display device comprising:
- a plurality of first gate lines;
- a plurality of second gate lines, each second gate line forming a pair along with each of the first gate lines;
- and
- a gate driver which sequentially transmits a first gate signal having a first gate-on voltage to the first gate lines, and sequentially transmits a second gate signal having a second gate-on voltage to the second gate lines,
- wherein the gate driver includes:
- a plurality of first stages, each first stage having a first output terminal which transmits the first gate signal to a corresponding first gate line from among each of the first gate lines, and
- a plurality of second stages, each second stage having a second output terminal which transmits the second gate signal to a corresponding second gate line from among each of the second gate lines, and a carry output terminal which outputs a carry signal in correspondence with the second gate signal, and
- wherein each first stage outputs the first gate-on voltage to the first output terminal based on a third gate-on voltage of the carry signal from a previous second stage, and
- each second stage outputs the second gate-on voltage to the second output terminal based on the third gate-on voltage of the carry signal from the previous second stage.
A driving device of a display device, the display device including a plurality of first gate lines which sequentially transmits a first gate signal having a first gate-on voltage, and a plurality of second gate lines which sequentially transmits a second gate signal having a second gate-on voltage, each of the plurality of the second gate lines respectively forming a pair with each of the first gate lines, the driving device comprising:
- a plurality of first stages each having a first output terminal which transmits the first gate signal to a corresponding first gate line from among each of the first gate lines;
- and
- a plurality of second stages each having a second output terminal which transmit the second gate signal to a corresponding second gate line from among each of the second gate lines, and a carry output terminal configured to output a carry signal corresponding to the second gate signal,
- wherein each first stage includes:
- a first transistor connected between a first clock terminal and the first output terminal, and having a gate connected to a first junction point,
- a second transistor which transmits a third gate-on voltage to the first junction point in response to the third gate-on voltage of the carry signal of a previous second stage, and
- a first capacitor connected between a gate and a source of the first transistor, the first capacitor stores the third gate-on voltage, and
- each second stage includes:
- a third transistor connected between a second clock terminal and the second output terminal, and having a gate connected to a second junction point,
- a fourth transistor which transmits the third gate-on voltage to the second junction point in response to the third gate-on voltage of the carry signal of the previous second stage,
- a second capacitor connected between a gate and a source of the third transistor, the second capacitor stores the third gate-on voltage, and
- a fifth transistor connected between the second clock terminal and the carry output terminal, and having a gate connected to the second junction point.
A driving method of a display device, the display device including a plurality of first gate lines which sequentially transmits a first gate signal having a first gate-on voltage, and a plurality of second gate lines which sequentially transmits a second gate signal having a second gate-on voltage, each of the second gate lines respectively forming a pair with each of the first gate lines, and a plurality of carry output terminals, each of said carry output terminals transmits a carry signal, the driving method comprising:
- transmitting the second gate signal to a corresponding (i−1)th second gate line from among the plurality of second gate lines during a period in which an (i-1)th carry output terminal transmits the carry signal in correspondence with the second gate signal;
- storing the carry signal and generating first and second gate-on voltages respectively transmitted to i-th first and second gate lines based on the stored carry signal from (i−1)th carry output terminal;
- changing the first gate-on voltage output to the i-th first gate line to a gate- off voltage while maintaining the second gate-on voltage output to the i-th second gate line;
- and
- transmitting the gate-off voltage to the i-th first and second gate lines.
Dependencies are inferred from the claim text.