Liquid crystal display device and method for driving same

1 . A liquid crystal display device comprising:

a plurality of gate lines configured for providing a plurality of scanning signals;

a plurality of data lines configured for providing a plurality of gray scale voltages;

a plurality of pixel units arranged in an array, each pixel unit comprising a first sub-pixel unit and a second sub-pixel unit, the first and second sub-pixel units being connected to one of the gate lines and one of the data lines;

a plurality of first common lines configured for providing a first common signal to the first sub-pixel units; and

a plurality of second common lines configured for providing a second common signal to the second sub-pixel units;

wherein the first and second common signals are pulse voltage signals and have different starting pulse times according to successive starting pulse times of the scanning signals.

2 . The liquid crystal display device of claim 1 , wherein the first and second common signals comprise a reference voltage and a pulse voltage, and when the first sub-pixel unit has the pulse voltage applied thereto, the second sub-pixel unit has the reference voltage applied thereto, and when the second sub-pixel unit has the pulse voltage applied thereto, the first sub-pixel unit has the reference voltage applied thereto.

3 . The liquid crystal display device of claim 2 , wherein a period between the time when the scanning signal of one of the gate lines changes from a low-level scanning voltage to a high-level scanning voltage and the time when the scanning signal of the gate line changes from the high-level scanning voltage to the low-level scanning voltage defines a scanning duration, and a pulse width of the pulse voltage is equal to the scanning duration of the gate line.

4 . The liquid crystal display device of claim 3 , wherein the first common lines and the second common lines are disposed alternately, and one of the gate lines is disposed between each two adjacent first and second common lines.

5 . The liquid crystal display device of claim 4 , wherein each of the pixel units is defined by the area between one of the first common lines, one of the second common lines adjacent to the first common line, and adjacent two data lines.

6 . The liquid crystal display device of claim 5 , wherein an amplitude of the pulse voltage is in the range of 0.5V˜5V.

7 . The liquid crystal display device of claim 6 , wherein the first sub-pixel unit comprises a first thin film transistor and a first storage capacitor, the second sub-pixel unit comprises a second thin film transistor and a second storage capacitor; the first and second thin film transistors each comprise a gate electrode, a drain electrode, and a source electrode; the first and second storage capacitors each comprise two electrodes; the gate electrodes of the first and second thin film transistors are coupled to the gate line, the drain electrodes of the first and second thin film transistors are coupled to one of the data lines, the source electrodes of the first and second thin film transistors are coupled to one electrode of the first and second storage capacitors, respectively; and the other electrodes of the first and second storage capacitors are connected to the first common line and the second common line, respectively.

8 . The liquid crystal display device of claim 7 , wherein an area ratio of the first sub-pixel unit relative to the second sub-pixel unit is 1:3.

9 . A liquid crystal display device comprising:

a plurality of gate lines configured for providing a plurality of scanning signals;

a plurality of data lines configured for providing a plurality of gray scale voltages;

a plurality of pixel units arranged in an array, each pixel unit comprising a first sub-pixel unit and a second sub-pixel unit, the first and second sub-pixel units being connected to one of the gate lines and one of the data lines;

a plurality of first common lines configured for providing a first common signal to the first sub-pixel units; and

a plurality of second common lines configured for providing a second common signal to the second sub-pixel units;

wherein the first and second common signals are pulse voltage signals, and when a scanning signal is provided to one of the gate lines, a pulse voltage of the first common signal is generated, and when a scanning signal is provided to a next adjacent one of gate lines, a pulse voltage of the second common signal is generated.

10 . The liquid crystal display device of claim 9 , wherein a period between the time when the scanning signal of one of the gate lines changes from a low-level scanning voltage to a high-level scanning voltage and the time when the scanning signal of the gate line changes from the high-level scanning voltage to the low-level scanning voltage defines a scanning duration, and a pulse width of the pulse voltage of each of the first and second common signals is equal to the scanning duration of the gate line.

11 . A method for driving a liquid crystal display device, the method comprising:

providing a plurality of pixel units arranged in an array, each pixel unit comprising a first sub-pixel unit and a second sub-pixel unit;

providing a plurality of gate lines, a plurality of data lines, a plurality of first common lines, and a plurality of second common lines, with each of the pixel units connected to one of the gate lines, one of the data lines, one of first common lines, and one of second common lines;

providing a plurality of scanning signals to the pixel units via the gate lines;

providing a plurality of gray scale voltages to the pixel units via the data lines;

providing a first common signal to the first sub-pixel units via the first common lines; and

providing a second common signal to the second sub-pixel units via the second common lines;

wherein the first and second common signals are pulse voltage signals and have different starting pulse times according to successive starting pulse times of the scanning signals.

12 . The method of claim 11 , wherein in each frame, the gate lines are scanned one by one successively.

13 . The method of claim 12 , wherein a period between the time when the scanning signal of a gate line changes from a low-level scanning voltage to a high-level scanning voltage and the time when the scanning signal of the gate line changes from the high-level scanning voltage to the low-level scanning voltage defines a scanning duration; and when one of the gate lines is scanned, the scanning signal changes from a low-level scanning voltage to a high-level scanning voltage, the first common signal remains at a reference voltage, and the second common signal generates a pulse voltage, and when the scanning signal changes from the high-level scanning voltage to the low-level scanning voltage, the second common signal changes from the pulse voltage to the reference voltage.

14 . The method of claim 13 , wherein a pulse width of the pulse voltage of the second common signal is equal to the scanning duration of the gate line.

15 . The method of claim 14 , wherein when a next adjacent one of the gate lines is scanned, a corresponding next scanning signal changes from the low-level scanning voltage to the high-level scanning voltage, the first common signal generates a pulse voltage, and the second common signal remains at the reference voltage, and when the next scanning signal changes from the high-level scanning voltage to the low-level scanning voltage, the first common signal changes from the pulse voltage to the reference voltage.

16 . The method of claim 15 , wherein a pulse width of the pulse voltage of the first common signal is equal to the scanning duration of the next gate line.