Liquid crystal display and driving method thereof

• US 9,030,452 B2
• Filed: 09/10/2013
• Issued: 05/12/2015
• Est. Priority Date: 04/22/2013
• Status: Active Grant

• Current Assignee: TCL China Star Optoelectronics Technology Co. Ltd. (TCL Technology Group Corp.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Jang, Dae-Gwang, Hong, Seok Ha, Goh, Joon-Chul, Kim, Byung Sun, Kim, Sang Mi, Seo, Ji Myoung
• Primary Examiner(s): ABDIN, SHAHEDA A
• Application Number:
  US14/023,334
• Publication Number:
  US 20140313113A1
• Time in Patent Office: 609 Days
• Field of Search: 345/78, 345/204, 345/208, 345/58, 345/63, 345/69, 345 92-100, 349/178, 349/139, 349/141, 257/59, 257/72
• US Class Current: 345/204
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2320/0204 Compensation of DC component across the pixels in flat panels
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

The described technology relates to a liquid crystal display and a driving method thereof. The liquid crystal display includes a plurality of pixels arranged in a matrix form. The pixels include a liquid crystal capacitor including a pixel electrode and a common electrode as two terminals. A plurality of data lines transfer data to the plurality of pixels. The pixels include a first pixel and a second pixel, which are adjacent to each other. First and second common signals are applied to the common electrode of the first and second pixels, respectively. The second common signal is inverted to the first common signal. The first and second common signals swing between a first voltage and a second voltage. The polarity of the data voltage transferred by a data line with respect to the first common signal or the second common signal is constant during one frame.

Claims

1. A liquid crystal display, comprising:

a plurality of pixels arranged in a matrix form, the pixels respectively including a liquid crystal capacitor, wherein the liquid crystal capacitor comprises a pixel electrode and a common electrode as two terminals; and

a plurality of data lines configured to transfer data voltages to the pixels,

wherein the pixels include first and second pixels which are adjacent to each other in a row or column direction,

wherein the common electrode of the first pixel is configured to receive a first common signal, wherein the common electrode of the second pixel is configured to receive a second common signal which is inverted to the first common signal,

wherein the first and second common signals are configured to swing between first and second voltages which are different from each other for at least every one frame,

wherein the polarity of the data voltage transferred by a data line with respect to the first or second common signal is constant during one frame, and

wherein the pixels comprise a plurality of switching elements respectively configured to receive the data voltages, and wherein the switching elements positioned in one column are alternately connected to two of the data lines for every predetermined number of rows.

2. The liquid crystal display of claim 1, wherein the polarity of the data voltage applied to the first pixel with respect to the first common signal is opposite to the polarity of the data voltage applied to the second pixel with respect to the second common signal.

3. The liquid crystal display of claim 2, wherein the polarities of the data voltages applied to a predetermined number of pixels which are adjacent to each other in a row or column direction with respect to the first or second common signal are the same as each other.

4. The liquid crystal display of claim 2, further comprising:

a plurality of gate lines configured to transfer gate signals to the pixels, the gate lines being arranged in a column direction, and

a plurality of blocks arranged in a column direction, each of the blocks including at least one pixel row,

wherein swing times of the first or second common signal applied to the pixel included in different ones of the blocks are different from each other.

5. The liquid crystal display of claim 4, wherein the swing times of the first or second common signal applied to the blocks are sequentially positioned in one frame.

6. The liquid crystal display of claim 5, further comprising:

a first common signal line configured to transfer the first common signal;

a second common signal line configured to transfer the second common signal; and

a common signal applying unit electrically connected to the first and second common signal lines.

7. The liquid crystal display of claim 6, wherein each of the blocks includes two sub blocks which are adjacent to each other in a row direction and separated from each other.

8. A liquid crystal display, comprising:

a plurality of pixels arranged in a matrix form, wherein each of the pixels comprises a liquid crystal capacitor, and wherein the liquid crystal capacitor includes a pixel electrode and a common electrode as two terminals; and

a plurality of data lines configured to transfer data voltages to the pixels; and

a plurality of gate lines configured to transfer gate signals to the pixels and arranged in a column direction,

wherein the pixels include i) a first pixel and ii) a second pixel which are adjacent to each other in a row or column direction,

wherein the common electrode of the first pixel is configured to receive a first common signal, wherein the common electrode of the second pixel is configured to receive a second common signal which is inverted to the first common signal,

wherein the first and second common signals are configured to swing between first and second voltages which are different from each other for at least every one frame,

wherein a plurality of blocks are arranged in a column direction, each of the blocks including at least one pixel row, and wherein swing times of the first or second common signal applied to the pixel included in different ones of the blocks are different from each other, and

wherein the pixels comprise a plurality of switching elements respectively configured to receive the data voltages, and wherein the switching elements positioned in one column are alternately connected to two of the data lines for every predetermined number of rows.

9. The liquid crystal display of claim 8, wherein the swing times are sequentially positioned in one frame.

10. The liquid crystal display of claim 9, further comprising:

a first common signal line configured to transfer the first common signal;

a second common signal line configured to transfer the second common signal; and

a common signal applying unit electrically connected to the first and second common signal lines.

11. The liquid crystal display of claim 10, wherein each of the blocks includes two sub blocks which are adjacent to each other in a row direction and separated from each other.

12. The liquid crystal display of claim 8, wherein the polarity of the data voltage transferred by a data line with respect to the first or second common signal is constant during one frame.

13. The liquid crystal display of claim 12, wherein the polarity of the data voltage applied to the first pixel with respect to the first common signal is opposite to the polarity of the data voltage applied to the second pixel with respect to the second common signal.

14. The liquid crystal display of claim 13, wherein the polarities of the data voltages applied to a predetermined number of pixels which are adjacent to each other in a row or column direction with respect to the first or second common signal are the same as each other.

15. A driving method of a liquid crystal display comprising i) a plurality of pixels arranged in a matrix form, the pixels respectively including a liquid crystal capacitor, wherein the liquid crystal capacitor includes a pixel electrode and a common electrode as two terminals, and ii) a plurality of data lines connected to the pixels, wherein the pixels include first and second pixels adjacent to each other in a row or column direction, the method comprising:

applying a first common signal to the common electrode of the first pixel,

applying a second common signal which is inverted to the first common signal to the common electrode of the second pixel; and

applying to a data line a data voltage of which the polarity with respect to the first or second common signal is constant during one frame,

wherein the first and second common signals swing between first and second voltages which are different from each other for at least every one frame, and

wherein the pixels comprise a plurality of switching elements respectively configured to receive the data voltage, and wherein the switching elements positioned in one column are alternately connected to two of the data lines for every predetermined number of rows.

16. The driving method of a liquid crystal display of claim 15, wherein the polarity of the data voltage applied to the first pixel with respect to the first common signal is opposite to the polarity of the data voltage applied to the second pixel with respect to the second common signal.

17. A driving method of a liquid crystal display including i) a plurality of pixels arranged in a matrix form, the pixels respectively comprising a liquid crystal capacitor, wherein the liquid crystal capacitor includes a pixel electrode and a common electrode as two terminals, and wherein the pixels include first and second pixels adjacent to each other in a row or column direction and ii) a plurality of data lines connected to the pixels, the method comprising:

applying a first common signal to the common electrode of the first pixel;

applying a second common signal which is inverted to the first common signal to the common electrode of the second pixel; and

applying data voltages to the data lines,

wherein the first and second common signals swing between first and second voltages which are different from each other for at least every one frame, and

wherein swing times of the first or second common signal, applied to the pixel included in different ones of the blocks arranged in a column direction each including at least one pixel row, are different from each other, and

wherein the pixels comprise a plurality of switching elements respectively configured to receive the data voltages, and wherein the switching elements positioned in one column are alternately connected to two of the data lines for every predetermined number of rows.

18. The driving method of a liquid crystal display of claim 17, wherein the swing times are sequentially positioned in one frame.