Liquid crystal display apparatus and driving method thereof

• US 20050041006A1
• Filed: 06/29/2004
• Published: 02/24/2005
• Est. Priority Date: 08/21/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Jae Kyun, Kim, Kyong Soek
• Granted Patent: US 7,425,942 B2
• Time in Patent Office: Days
• US Class Current: 345/99
• CPC Class Codes: G09G 2300/0895 having more than one selection line for a two-terminal active matrix LCD, e.g. Lechner and D2R circuits
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A liquid crystal display apparatus and a method of driving the same capable of lowering a power consumption as well as a production cost. A liquid crystal display apparatus according to the present invention comprises: pixels including red, green and blue color pixels arranged in a direction along a data line; gate line groups, each gate line group having a set of two gate lines electrically connected each other, and each gate line crossing the data line; a data driver that drives the data line; a gate driver that drives the gate line groups; and a timing controller that controls the data driver and the gate driver, the timing controller having at least one line memory that temporarily stores data supplied to the data driver.

Claims

1. A liquid crystal display apparatus comprising:

pixels including red, green and blue color pixels arranged in a direction along a data line;

gate line groups, each gate line group having a set of two gate lines electrically connected each other, and each gate line crossing the data line;

a data driver that drives the data line;

a gate driver that drives the gate line groups; and

a timing controller that controls the data driver and the gate driver, the timing controller having at least one line memory that temporarily stores data supplied to the data driver.

2. The liquid crystal display apparatus of claim 1, wherein the timing controller includes three line memories to store red data, green data and blue data supplied to the liquid crystal display.

3. The liquid crystal display apparatus of claim 2, wherein the timing controller modifies a data enable signal supplied to the timing controller to generate a modified data enable signal having period that is ⅓

of the horizontal period.

4. The liquid crystal display apparatus of claim 3, wherein the data stored in the line memory is supplied to the data driver every one period of the modified data enable signal.

5. The liquid crystal display apparatus of claim 4, wherein the gate driver sequentially supplies a first and a second gate pulse to each of the gate line groups.

6. The liquid crystal display apparatus of claim 5, wherein the first gate pulse supplied to an i+1th gate line group is overlapped with the second gate pulse supplied to an ith gate line group in a portion of the period.

7. The liquid crystal display apparatus of claim 6, wherein the first gate pulse has a pulse width that is narrower than the second gate pulse.

8. The liquid crystal display apparatus of claim 7, wherein,

when the second gate pulse is supplied to the ith gate line group and the first gate pulse is supplied to the i+1th gate line group, a second thin film transistor (TFT) is turned-on by the second gate pulse supplied to the ith gate line group and a first TFT is turned-on by the first gate pulse being provided via the turned-on second TFT, to thereby supply designated data to a color pixel connected to the first TFT, and

when the first gate pulse supplied to the i+1th gate line group is off and only the second gate pulse is supplied to the ith gate line group, a third TFT formed in the ith gate line group is turned-on, to thereby supply designated data to a color pixel connected to the turned-on third TFT.

9. The liquid crystal display apparatus of claim 8, wherein the data driver is synchronized with the modified data enable signal to supply any one of the red, the green and the blue data to the data line every ⅓

horizontal period.

10. The liquid crystal display apparatus of claim 9, wherein the data driver is synchronized with the modified data enable signal to invert polarities of the red, the green and the blue data sequentially supplied for every ⅓

horizontal period.

11. The liquid crystal display apparatus of claim 7, wherein,

when the second gate pulse is supplied to the ith gate line group and the first gate pulse is supplied to the i+1th gate line group, a third thin film transistor (TFT) is turned-on by the second gate pulse supplied to the ith gate line group and a second TFT is turned-on by the first gate pulse being provided via the turned-on third TFT, to thereby supply designated data to a color pixel connected to the second TFT, and

when the first gate pulse supplied to the i+1th gate line group is off and only the second gate pulse is supplied to the ith gate line group, a first TFT is turned-on by the second pulse supplied to the ith gate line group, to thereby supply designated data to a color pixel connected to the turned-on first TFT.

12. The liquid crystal display apparatus of claim 11, wherein the data driver is synchronized with the modified data enable signal to supply the red, the green and the blue data to the data line for every ⅓

horizontal period in a vertical direction.

13. The liquid crystal display apparatus of claim 12, wherein the data driver is synchronized to the modified data enable signal to invert polarities of the red, the green and the blue data sequentially supplied for every ⅓

horizontal period.

14. The liquid crystal display apparatus of claim 7, wherein,

when the second gate pulse is supplied to the ith gate line group and the first gate pulse is supplied to the i+1th gate line group, a third thin film transistor (TFT) and a fourth TFT are turned-on by the second gate pulse supplied to the ith gate line group, to thereby supply designated data to a color pixel connected to the fourth TFT, and

when the first gate pulse supplied to the i+1th gate line group is off and only the second gate pulse is supplied to the ith gate line group, a first TFT and a second TFT which are formed in the ith gate line group are turned-on by the second pulse, to thereby supply designated data to a color pixel connected to the turned-on second TFT.

15. The liquid crystal display apparatus of claim 14, wherein the data driver is synchronized with the modified data enable signal to supply the red, the green and the blue to the data line for every ⅓

horizontal period in a vertical direction.

16. The liquid crystal display apparatus of claim 15, wherein the data driver is synchronized with the modified data enable signal to invert polarities of the red, the green and the blue data sequentially supplied for every ⅓

horizontal period.

17. A method of driving a liquid crystal display apparatus, the liquid crystal display apparatus including pixels with red, green and blue color pixels arranged in vertical along a data line;

and gate line groups, each gate line group having a set of two gate lines electrically connected each other, each gate line crossing the data line, the method comprising;

sequentially supplying a gate pulse having first and second gate pulses to the gate line group; and

supplying designated data to each of the red, the green and the blue color pixels in accordance with the first and the second pulses sequentially supplied to the gate line group.

18. The method of claim 17, wherein the first gate pulse supplied to an i+1th gate line group is overlapped with the second gate pulse supplied to an ith gate line group in a portion of a period.

19. The method of claim 18, wherein the first gate pulse has a pulse width narrower than that of the second gate pulse.

20. The method of claim 19, wherein, in the step of supplying data,

when the second gate pulse is supplied to the ith gate line group and the first gate pulse is supplied to the i+1th gate line group, a second thin film transistor (TFT) is turned-on by the second gate pulse supplied to the ith gate line group and a first TFT is turned-on by the first gate pulse being provided via the turned-on second TFT, to thereby supply designated data to a color pixel connected to the second TFT, and

when the first gate pulse supplied to the i+1th gate line group is off and only the second gate pulse is supplied to the ith gate line group, a third TFT formed in the ith gate line group is turned-on, to thereby supply designated data to a color pixel connected to the turned-on third TFT.

21. The method of claim 20, wherein the step of supplying data includes supplying any one of the red, the green and the blue data to the data line for every ⅓

of a horizontal period.

22. The method of claim 21, wherein polarities of the data are inverted for every ⅓

horizontal period.

23. The method of claim 19, wherein, in the step of supplying the data,

when the second gate pulse is supplied to the ith gate line group and the first gate pulse is supplied to the i+1th gate line group, a third thin film transistor (TFT) is turned-on by the second gate pulse supplied to the ith gate line group and then a second TFT is turned-on by the first gate pulse being provided via the turned-on third TFT, to thereby supply designated data to a color pixel connected to the second TFT, and

when the first gate pulse supplied to the i+1th gate line group is off and only the second gate pulse is supplied to the ith gate line group, a first TFT is turned-on by the second gate pulse, to thereby supply designated data to a color pixel connected to the turned-on first TFT.

24. The method of claim 23, wherein the step of supplying data includes supplying the red, the green and the blue to the data line for every ⅓

horizontal period in a vertical direction.

25. The method of claim 24, wherein polarities of the data are inverted for every ⅓

horizontal period.

26. The method of claim 19, wherein, in the step of supplying the data,

when the second gate pulse is supplied to the ith gate line group and the first gate pulse is supplied to the i+1th gate line group, a third TFT and a fourth TFT are turned-on by the second gate pulse supplied to the ith gate line group, to thereby supply designated data to a color pixel connected to the fourth TFT, and

when the first gate pulse supplied to the i+1th gate line group is off and only the second gate pulse is supplied to the ith gate line group, a first TFT and a second TFT are turned-on, to thereby supply designated data to a color pixel connected to the turned-on second TFT.

27. The method of claim 26, wherein the step of supplying data includes supplying the red, the green and the blue data to the data line for every ⅓

horizontal period.

28. The method of claim 27, wherein polarities of the data are inverted for every ⅓

horizontal period.