Liquid crystal display and driving method thereof
View Patent ↗A liquid crystal display, the liquid crystal display comprises a plurality of gate lines which includes a first gate line, a transformation gate line, and a second gate line; a data line; and a pixel, wherein the pixel includes a first liquid crystal capacitor which includes a first sub-pixel electrode and a common electrode and a second liquid crystal capacitor which includes a second sub-pixel electrode and a common electrode; a first switching element connected to the first gate line, the data line, and the first sub-pixel electrode; a second switching element connected to the first gate line, the data line, and the second sub-pixel electrode; a third switching element connected to the transformation gate line and the second switching element; a transformation capacitor which includes a first terminal connected to the second gate line and a second terminal connected to the third switching element; and a first period where a gate-on voltage Von is applied to the first gate line and a second period where the gate-on voltage Von is applied to the transformation gate line do not overlap each other and, a gate-off voltage Voff is applied to the second gate line during the second period.
1. A liquid crystal display, the liquid crystal display comprising:
a plurality of gate lines which includes a first gate line, a transformation gate line, and a second gate line;
a data line; and
a pixel, wherein the pixel includes:
a first liquid crystal capacitor which includes a first sub-pixel electrode and a common electrode and a second liquid crystal capacitor which includes a second sub-pixel electrode and a common electrode;
a first switching element connected to the first gate line, the data line, and the first sub-pixel electrode;
a second switching element connected to the first gate line, the data line, and the second sub-pixel electrode;
a third switching element connected to the transformation gate line and the second switching element;
a transformation capacitor which includes a first terminal directly connected to the second gate line and a second terminal connected to the third switching element; and
wherein a gate-on voltage applied to the first gate line defines a first period and the gate-on voltage applied to the transformation gate line defines a second period, the first and second periods do not overlap each other and, a gate-off voltage is applied to the second gate line during the second period.
2. The liquid crystal display of claim 1 , wherein
the second period is subsequent to the first period within a frame period.
3. The liquid crystal display of claim 2 , wherein
the first switching element and the second switching element are turned-on in the first period, such that the first liquid crystal capacitor and the second liquid crystal capacitor are each charged to a first voltage.
4. The liquid crystal display of claim 3 , wherein
the third switching element is turned-on in the second period, such that the second liquid crystal capacitor and the transformation capacitor share charge.
5. The liquid crystal display of claim 4 , wherein
the second liquid crystal capacitor is charged to the second voltage after the second period.
6. The liquid crystal display of claim 5 , wherein
the second voltage is substantially lower than the first voltage.
7. The liquid crystal display of claim 1 , wherein
the second gate line and the first gate line are consecutive gate lines.
8. The liquid crystal display of claim 7 , wherein
the second gate line is a gate line previous to the first gate line.
9. The liquid crystal display of claim 7 , wherein
the second gate line is a gate line subsequent to the first gate line.
10. The liquid crystal display of claim 1 , wherein
periods of consecutive gate lines of the plurality of gate lines to which the gate-on voltage is each applied overlap each other.
11. The liquid crystal display of claim 10 , wherein
a period where the gate-on voltage is applied to each of the plurality of gate lines is 1H and the periods of consecutive gate lines of the plurality of gate lines to which the gate-on voltage is each applied overlap by ⅔H.
12. The liquid crystal display of claim 11 , wherein
the first gate line is an i-th gate line (where i=2, 3 . . . , n), the second gate line is an i−1-th gate line, and the transformation gate line is an i+4-th gate line.
13. The liquid crystal display of claim 11 , wherein
the first gate line is an i-th gate line (where i=2, 3 . . . , n), the second gate line is an i+1-th gate line, the transformation gate line is an i+4-th gate line.
14. The liquid crystal display of claim 11 , wherein
the gate-on voltage applied to the plurality of gate lines is generated based on a first to sixth clock signals, and
the first to sixth clock signals each have a 2H period and sequentially have a phase difference of about 60°.
15. A driving method for a liquid crystal display including a plurality of gate lines which includes a first gate line, a transformation gate line, and a second gate line; a data line, and a pixel, wherein the pixel includes: a first liquid crystal capacitor which includes a first sub-pixel electrode and a common electrode and a second liquid crystal capacitor which includes a second sub-pixel electrode and a common electrode; a first switching element connected to the first gate line, the data line, and the first sub-pixel electrode; a second switching element connected to the first gate line, the data line, and the second sub-pixel electrode; a third switching element connected to the transformation gate line and the second switching element; a transformation capacitor which includes a first terminal directly connected to the second gate line and a second terminal connected to the third switching element, the method comprising:
applying gate-on voltage to a first gate line to charge the first liquid crystal capacitor and the second liquid crystal capacitor with a first voltage;
applying the gate-on voltage to the transformation gate line to allow the second liquid crystal capacitor and the transformation capacitor to share charge; and
applying gate-off voltage to the transformation gate line to charge the second liquid crystal capacitor with the second voltage,
wherein a second period defining the gate-on voltage applied to the transformation gate line starts after a first period defining the gate-on voltage applied to the first gate line is completed, and the gate-off voltage is applied to the second gate line during the entire second period.
16. The method of claim 15 , wherein
the second voltage is substantially lower than the first voltage.
17. The method of claim 15 , wherein
the second gate line and the first gate line are consecutive gate lines.
18. The method of claim 15 , wherein
periods of consecutive gate lines of the plurality of gate lines to which the gate-on voltage is each applied overlap each other.
19. The liquid crystal display of claim 1 , wherein the second period where the gate-on voltage is applied to the transformation gate line during the entire second period does not overlap and is separated from the first period, and the gate-off voltage is applied to the second gate line during the entire second period.