Display apparatus including a gate driver that has a plurality of stages and method for driving the display apparatus
View Patent ↗A display apparatus includes a panel part, a data driver, and a gate driver. The panel part includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels each of which is connected to one gate line of the gate lines and one data line of the data lines. The data driver receives image data and outputs a data signal to the data lines. The gate driver part is disposed on the panel part and applies gate signals to the gate lines. Periods of clock signals controlling the level of the gate signals are different from that of the gate signals. Thus, power consumption of the display apparatus is substantially effectively reduced.
1. A display apparatus comprising:
a panel part comprising:
a plurality of gate lines,
a plurality of data lines, and
a plurality of pixels, each pixel of the plurality of pixels being connected to a gate line of the plurality of gate lines and being connected to a data line of the plurality of data lines;
a data driver which receives image data and outputs at least a data signal to the plurality of data lines; and
a gate driver part disposed on the panel part, the gate driver part receiving a plurality of clock signals and applying a plurality of gate signals to the plurality of gate lines,
the gate driver part including at least a first stage and a second stage, the first stage receiving a first clock signal having a first initial rising edge and a second clock signal having a second initial rising edge received after the first rising edge, the second stage receiving a third clock signal having a third initial rising edge received after the first rising edge and a fourth clock signal having a fourth initial rising edge received after the third rising edge,
the first stage outputting a first gate signal, the second stage outputting a second gate signal, the first stage, which receives the first clock signal and the second clock signal, receiving the second gate signal from the second stage, which receives the third clock signal and the fourth clock signal,
wherein a phase difference between the first rising edge and the third rising edge received after the first rising edge is 90 degrees, and wherein a phase difference of the second rising edge and the fourth rising edge received after the second rising edge is 90 degrees,
wherein the first stage and the second stage are connected to each other in sequence, and
wherein the first stage receives a scanning start signal.
2. The display apparatus of claim 1 , wherein a frequency of the plurality of clock signals is smaller than a frequency of the plurality of gate signals.
3. The display apparatus of claim 1 , wherein a frequency of the plurality of clock signals is half a frequency of the plurality of gate signals.
4. The display apparatus of claim 1 , wherein
the gate driver part comprises a plurality of stages, each stage of the plurality of stages being connected to a corresponding gate line of the plurality of gate lines,
the plurality of stages are divided into odd-numbered stages and even-numbered stages,
the plurality of gate lines are divided into odd-numbered gate lines and even-numbered gate lines,
the first stage is a first odd-numbered stage of the odd-numbered stages and the second stage is a first even-numbered stage of the even-numbered stages,
an odd-numbered stage of the odd-numbered stages applies a gate signal to an odd-numbered gate line of the odd-numbered gate lines,
and an even-numbered stage of the even-numbered stages applies another gate signal to an even-numbered gate line of the even-numbered gate lines.
5. The display apparatus of claim 4 , wherein
each of the odd-numbered stages receives the first clock signal and the second clock signal, and
each of the even-numbered stages receives the third clock signal and the fourth clock signal.
6. The display apparatus of claim 1 , wherein a polarity of the data signal is inverted for each consecutive frame and each consecutive row.
7. The display apparatus of claim 1 , wherein
a phase difference between the first rising edge and the second rising edge is about 180 degrees, and
a phase difference between the third rising edge and the fourth rising edge is about 180 degrees.
8. The display apparatus of claim 1 , wherein periods of the first clock signal, the second clock signal, the third clock signal, and the fourth clock signal are substantially equal.
9. The display apparatus of claim 1 , wherein amplitudes of the first clock signal, the second clock signal, the third clock signal, and the fourth clock signal are substantially equal.
10. The display apparatus of claim 1 , further comprising:
a timing controller which receives the image data from outside and outputs the image data to the data driver; and
a gray-scale voltage generator which provides a gray-scale voltage to the data driver to generate the data signal.
11. The display apparatus of claim 1 , wherein periods of the plurality of clock signals are different from periods of the plurality of gate signals.
12. The display apparatus of claim 1 , wherein the second stage, which receives the third clock signal and the fourth clock signal, receives a carry output from the first stage, which receives the first clock signal and the second clock signal.
13. The display apparatus of claim 1 , wherein the second stage provides the second gate signal to reset the first gate signal.
14. The display apparatus of claim 1 , wherein
the first clock signal maintains a logic level for a first horizontal period and a second horizontal period, and
the first gate signal maintains the logic level for the first horizontal period.
15. The display apparatus of claim 14 , wherein the second gate signal maintains the logic level for the second horizontal period.
16. The display apparatus of claim 1 , wherein the gate driver part further includes at least a third stage, the third stage receiving the first clock signal and the second clock signal, the third stage outputting a third gate signal to the second stage, which receives the third clock signal and the fourth clock signal, for resetting the second gate signal.
17. The display apparatus of claim 16 , wherein the third stage receives a carry output from the second stage.
18. The display apparatus of claim 1 , wherein
the first clock signal and the second clock signal are supplied in a first direction to the first stage, and
the third clock signal and the fourth clock signal are supplied in the first direction to the second stage.
19. The display apparatus of claim 1 , wherein a period length of the scanning start signal is half a period length of the first clock signal.
20. A method of driving a display apparatus comprising;
supplying, using a gate driver, at least a gate-on signal to a plurality of gate lines, the gate driver including at least a first stage and a second stage, the plurality of gate lines including at least a first gate line and a second gate line, the first stage and the second stage being connected to each other in sequence;
providing a scanning start signal from a timing controller to the first stage but not from the timing controller to the second stage;
providing a first clock signal having a first initial rising edge and a second clock signal having a second initial rising edge received after the first rising edge;
providing a first gate signal from the first stage to the first gate line;
providing a third clock signal having a third initial rising edge received after the first rising edge and a fourth clock signal having a fourth initial rising edge received after the third rising edge;
providing a second gate signal from the second stage to the second gate line;
providing the second gate signal from the second stage, which receives the third clock signal and the fourth clock signal, to the first stage, which receives the first clock signal and the second clock signal, for resetting the first gate signal; and
supplying at least a data signal to a plurality of data lines,
wherein a phase difference between the first rising edge and the third rising edge received after the first rising edge is 90 degrees, and wherein a phase difference of the second rising edge and the fourth rising edge received after the second rising edge is 90 degrees.
21. The display apparatus of claim 13 , wherein a period length of the scanning start signal is half a period length of the first clock signal.