Liquid crystal display and method and apparatus for driving the same

• US 20040239839A1
• Filed: 12/30/2003
• Published: 12/02/2004
• Est. Priority Date: 06/02/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Hong, Hyung-Ki
• Granted Patent: US 7,336,325 B2
• Time in Patent Office: Days
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/133622 Colour sequential illumination
• 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 and apparatus for driving a liquid crystal display (LCD) panel having pixels arranged in a matrix pattern, wherein each pixel includes two sub-pixels capable of transmitting complementary colors, includes a light source array having first to third light sources and a data driver for applying data signals to the LCD panel during first and second sub-frames of the LCD panel, wherein the first and second sub-frames constitute a single frame of the LCD panel. Two of the first to third light sources may be activated during each sub-frame to emit light to the liquid crystal display panel, wherein a full color image is realized in only two sub-frames.

Claims

1. A liquid crystal display panel, comprising:

a plurality of first and second sub-pixel pairs arranged in a matrix pattern, wherein a color of light transmittable by the first sub-pixel is complementary to a color of light transmittable by the second sub-pixel.

2. The liquid crystal display panel according to claim 1, wherein

the first sub-pixel is a blue sub-pixel;

and

the second sub-pixel is a yellow sub-pixel.

3. The liquid crystal display panel according to claim 2, wherein

the first sub-pixel includes a blue sub-color filter transmitting blue light and absorbing red and green light;

and

the second sub-pixel includes a second sub-color filter transmitting red and green light and absorbing blue light.

4. The liquid crystal display panel according to claim 1, wherein

the first sub-pixel is a green sub-pixel;

and

the second sub-pixel is a magenta sub-pixel.

5. The liquid crystal display panel according to claim 4, wherein

the first sub-pixel includes a green sub-color filter transmitting green light and absorbing red and blue light;

and

the second sub-pixel includes a second sub-color filter transmitting red and blue light and absorbing green light.

6. The liquid crystal display panel according to claim 1, wherein

the first sub-pixel is a red sub-pixel;

and

the second sub-pixel is a cyan sub-pixel.

7. The liquid crystal display panel according to claim 6, wherein

the first sub-pixel includes a red sub-color filter transmitting red light and absorbing green and blue;

and

the second sub-pixel includes a second sub-color filter transmitting green and blue light and absorbing red light.

8. The liquid crystal display panel according to claim 1, wherein the area of the first sub-pixel is less than the area of the second sub-pixel.

9. An apparatus for driving a liquid crystal display panel having a plurality of pixels arranged in a matrix pattern, wherein each pixel includes a first sub-pixel and a second sub-pixel, and wherein a color of light transmittable by the first sub-pixel is complementary to a color of light transmittable by the second sub-pixel, the apparatus comprising:

a light source array having first, second, and third light sources emitting first, second, and third colors of light, respectively; and

a light source driver driving the light source array during a first sub-frame and a second sub-frame of the LCD panel, wherein the first and second sub-frames constitute a single frame of the LCD panel, and wherein the light source driver drives at least two light sources during each sub-frame.

10. The apparatus according to claim 9, wherein:

the first sub-pixel is a blue sub-pixel transmitting blue light and absorbing red and green light; and

the second sub-pixel is a yellow sub-pixel transmitting red and green light and absorbing blue light.

11. The apparatus according to claim 9, wherein:

the first sub-pixel is a green sub-pixel transmitting green light and absorbing red and blue light; and

the second sub-pixel is a magenta sub-pixel transmitting red and blue light and absorbing green light.

12. The apparatus according to claim 9, wherein:

the first sub-pixel is a red sub-pixel transmitting red light and absorbing green and blue light; and

the second sub-pixel is a cyan sub-pixel transmitting green and blue light and absorbing red light.

13. The apparatus according to claim 9, wherein

the first light source emits red light;

the second light source emits green light; and

the third light source emits blue light.

14. The apparatus according to claim 9, wherein the light source driver activates

the first and third light sources during the first sub-frame;

and

the second and third light sources during the second sub-frame.

15. The apparatus according to claim 9, wherein the light source driver divides gate lines on the liquid crystal display panel into at least one gate line group, and drives predetermined ones of the first to third light sources in accordance with an activation state of gate lines within each gate line group.

16. The apparatus according to claim 9, further comprising:

a data driver that applies red, green, and blue data signals to the liquid crystal display panel within a single frame period;

a gate driver that scans the liquid crystal display panel at least twice during one frame period; and

a timing controller that controls the data driver, the gate driver, and the light source driver.

17. The apparatus according to claim 9, wherein the area of the first sub-pixel is less than the area of the second sub-pixel.

18. The apparatus according to claim 13, wherein the third light source is smaller than the first and second light sources.

19. A method for driving a liquid crystal display panel, having a plurality of pixels arranged in a matrix pattern, wherein each pixel includes a first sub-pixel and a second sub-pixel, and wherein a color of light transmittable by the first sub-pixel is complementary to a color of light transmittable by the second sub-pixel, the method comprising:

dividing a single frame period of the liquid crystal display panel into a first sub-frame and a second sub-frame; and

activating at least two of red, green, and blue light sources during the first and second sub-frames.

20. The method according to claim 19, wherein:

the first sub-pixel is a blue sub-pixel transmitting blue light and absorbing red and green light; and

the second sub-pixel is a yellow sub-pixel transmitting red and green light and absorbing blue light.

21. The method according to claim 19, wherein:

the first sub-pixel is a green sub-pixel transmitting green light and absorbing red and blue light; and

the second sub-pixel is a magenta sub-pixel transmitting red and blue light and absorbing green light.

22. The method according to claim 19, wherein:

the first sub-pixel is a red sub-pixel transmitting red light and absorbing green and blue light; and

the second sub-pixel is a cyan sub-pixel transmitting green and blue light and absorbing red light.

23. The method according to claim 19, wherein the activating at least two of the red, green, and blue light sources during the first and second sub-frames includes:

activating the red and blue light sources during the first sub-frame; and

activating the green and blue light sources during the second sub-frame.

24. The method according to claim 19, wherein step of emitting the light to the liquid crystal display panel includes driving predetermined ones of the first to third light sources in accordance within an activation state of gate lines within each gate line group.