Method and apparatus for driving liquid crystal display

• US 20050140636A1
• Filed: 06/29/2004
• Published: 06/30/2005
• Est. Priority Date: 12/29/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Chung, In Jae, Kim, Ki Duk, Oh, Eui Yeol
• Granted Patent: US 7,629,988 B2
• Time in Patent Office: Days
• US Class Current: 345/98
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A method of driving a liquid crystal display including a color filter array having a plurality of red, green, blue and white color filters includes applying first driving signals to first liquid crystal cells during one frame interval, the first liquid crystal cells being overlapped by the red, green and blue color filters, respectively, applying a second driving signal to a second liquid crystal cell during a partial period of the one frame interval, the second liquid crystal cell being overlapped by the white color filter, and applying a third driving signal different from the second driving signal to the second liquid crystal cell during a remaining period of the one frame interval.

Claims

1. A method of driving a liquid crystal display including a color filter array having a plurality of red, green, blue and white color filters, comprising:

applying first driving signals to first liquid crystal cells during one frame interval, the first liquid crystal cells being overlapped by the red, green and blue color filters, respectively;

applying a second driving signal to a second liquid crystal cell during a partial period of the one frame interval, the second liquid crystal cell being overlapped by the white color filter; and

applying a third driving signal different from the second driving signal to the second liquid crystal cell during a remaining period of the one frame interval.

2. The method of claim 1, wherein a white light is applied during the one frame interval to the red, green and blue color filters through the first liquid crystal cells.

3. The method of claim 1, wherein the partial period of the one frame interval is a first half of the one frame interval.

4. The method of claim 1, wherein applying a second driving signal includes applying a yellow light to the white color filter through the second liquid crystal cell.

5. The method of claim 4, wherein applying a third driving signal includes applying a cyan light to the white color filter through the second liquid crystal cell.

6. The method of claim 1, wherein, applying the second driving signal includes applying a cyan light to the white color filter through the second liquid crystal cell.

7. The method of claim 6, wherein applying the third driving signal includes applying a yellow light to the white color filter through the second liquid crystal cells.

8. The method of claim 1, wherein applying the second driving signal includes applying a magenta light to the white color filter, and applying the third driving signal includes applying a yellow light to the white color filter.

9. The method of claim 1, wherein applying the second driving signal includes applying a yellow light to the white color filter, and applying the third driving signal includes applying a magenta light to the white color filter.

10. The method of claim 1, wherein applying the second driving signal includes applying a magenta light to the white color filter, and applying the third driving signal includes applying a cyan light to the white color filter.

11. The method of claim 1, wherein applying the second driving signal includes applying a cyan light to the white color filter, and applying the third driving signal includes applying a magenta light to the white color filter.

12. A method of driving a liquid crystal display including a color filter array having a plurality of red, green, blue and white color filters, comprising:

applying first driving signals to first liquid crystal cells during a first half of one frame interval, the first liquid crystal cells being overlapped by the red, green, blue and white color filters, respectively;

applying a second driving signal to a second liquid crystal cell during a partial period of the one frame interval, the second liquid crystal cell being overlapped by the white color filter; and

applying a third driving signal different from the second driving signal to the second liquid crystal cell during a remaining period of the one frame interval.

13. The method of claim 12, wherein a white light is applied to the first and second liquid crystal cells during the one frame interval.

14. The method of claim 12, wherein the first driving signal is applied during the first half of the one frame interval and during a first period of a second half of the one frame interval.

15. The method of claim 14, wherein a yellow light is applied to the second liquid crystal cell during the first period.

16. The method of claim 15, wherein applying the second driving signal includes applying a cyan light during a second period equal in duration to the first period.

17. The method of claim 16, wherein each of the first and second periods is set to a range of 1 ms to 3 ms.

18. The method of claim 14, wherein a cyan light is applied to the second liquid crystal cell during the first period.

19. The method of claim 18, wherein applying the second driving signal includes applying a yellow light during a second period equal in duration to the first period.

20. The method of claim 14, wherein applying the second driving signal includes applying a magenta light to the second liquid crystal cell during the first period, and applying the third driving signal includes applying a yellow light to the second liquid crystal cell during a second period of the second half of the one frame interval, the second period being equal in duration to the first period.

21. The method of claim 14, wherein applying the second driving signal includes applying a yellow light to the second liquid crystal cell during the first period, and applying the third driving signal includes applying a magenta light to the second liquid crystal cell during a second period of the second half of the one frame interval, the second period being equal in duration to the first period.

22. The method of claim 14, wherein applying the second driving signal includes applying a magenta light to the second liquid crystal cell during the first period, and applying the third driving signal includes applying a cyan light to the second liquid crystal cell during a second period of the second half of the one frame interval, the second period being equal in duration to the first period.

23. The method of claim 14, wherein applying the second driving signal includes applying a cyan light to the second liquid crystal cell during the first period, and applying the third driving signal includes applying a magenta light to the second liquid crystal cell during a second period of the second half of the one frame interval, the second period being equal in duration to the first period.

24. A driving apparatus for a liquid crystal display, comprising:

a color filter array having a plurality of red, green, blue and white color filters;

a liquid crystal display panel including a plurality of liquid crystal cells being overlapped by the plurality of red, green, blue and white color filters; and

a back light part including a plurality of cold cathode fluorescent lamps for applying a white light to the liquid crystal display panel, and at least another light source provided between the cold cathode fluorescent lamps to apply light of a color other than white.

25. The driving apparatus of claim 24, wherein the red, green, blue and white color filters are provided for horizontal lines of the color filter array.

26. The driving apparatus of claim 24, wherein the red and green color filters are alternately arranged at even-numbered horizontal lines of the color filter array while the blue and white color filters are alternately arranged at odd-numbered horizontal lines of the color filter array.

27. The driving apparatus of claim 24, wherein the red and green color filters are alternately arranged at odd-numbered horizontal lines of the color filter array while the blue and white color filters are alternately arranged at even-numbered horizontal lines of the color filter array.

28. The driving apparatus of claim 24, wherein a plurality of yellow light sources for applying yellow light and a plurality of cyan light sources for applying cyan light are alternately arranged between the cold fluorescent lamps.

29. The driving apparatus of claim 24, wherein a plurality of yellow light sources for applying yellow light and a plurality of magenta light sources for applying magenta light are alternately arranged between the cold fluorescent lamps.

30. The driving apparatus of claim 24, wherein a plurality of cyan light sources for applying cyan light and a plurality of magenta light sources for applying magenta light are alternately arranged between the cold fluorescent lamps.

31. A method of driving a liquid crystal display including a color filter array having a plurality of red, green, blue and white color filters, comprising:

applying first driving signals to first liquid crystal cells and a second liquid cell during a first half of one frame interval, the first liquid crystal cells being overlapped by the red, green, blue color filters, respectively, and the second liquid crystal cell being overlapped by the white color filter;

applying a second driving signal to second liquid crystal cell during a partial period of the one frame interval; and

applying a third driving signal different from the second driving signal to the second liquid crystal cell during a remaining period of the one frame interval.