Display apparatus and method of driving the same

Patent metadata

Field	Value
Publication number	US-9659545-B2
Application number	US-201213720274-A
Country	US
Kind code	B2
Filing date	Dec 19, 2012
Priority date	May 11, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A display apparatus includes a display panel and a light source part. The display panel includes a first subpixel having a first color, a second subpixel having a second color and a transparent subpixel. The light source part provides a light to the display panel. The light source part includes a first light source generating a first light having a mixed color of the first primary color and the second primary color and a second light source generating a second light having a third primary color. At least one of the first and second light sources are repeatedly turned on and off.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel including a first subpixel having a first color, a second subpixel having a second color and a transparent subpixel; and
a light source part providing a light to the display panel and including a first light source configured to generate a first light having a mixed color of the first color and the second color and a second light source configured to generate a second light having a third color, at least one of the first and second light sources being repeatedly turned on and off,
wherein the light source part includes only two kinds of light sources providing at least two different colors.

2. The display apparatus of claim 1 , wherein a frequency of an image displayed on the display panel including the first, second and transparent subpixels is synchronized with a frequency of turning on and off of at least one of the first and second light sources.

3. The display apparatus of claim 2 , wherein the display panel displays the image at a frame rate of at least about 120 Hz, and
at least one of the first and second light sources are repeatedly turned on and off at a frequency of at least about 120 Hz.

4. The display apparatus of claim 2 , wherein the display panel is capable of displaying a three-dimensional (“3D”) image, the display panel alternately displays a left image and a right image at a frequency of at least about 120 Hz., and
at least one of the first and second light sources are repeatedly turned on and off at a frequency of at least about 240 Hz.

5. The display apparatus of claim 1 , wherein the first light source is turned on during a first subframe, and
the second light source is turned on during a second subframe.

6. The display apparatus of claim 5 , further comprising a panel driver configured to provide respective driving signals to the first subpixel, to the second subpixel and to the transparent subpixel.

7. The display apparatus of claim 6 , wherein during the first subframe, the panel driver is configured to set a grayscale data level of the first subpixel to A-min(A,B), a grayscale data level of the second subpixel to B-min(A,B) and a grayscale data level of the transparent subpixel to min(A,B),
during the second subframe, the panel driver is configured to set the grayscale data level of the transparent subpixel to C, and
wherein A is a grayscale of the first color, B is a grayscale of the second color, C is a grayscale of the third color and min(A,B) is a minimum value chosen as among A and B.

8. The display apparatus of claim 6 , wherein during the first subframe, the panel driver is configured to set a grayscale data level of the first subpixel to A, a grayscale data level of the second subpixel to B and a grayscale data level of the transparent subpixel to A+B,
during the second subframe, the panel driver is configured to set the grayscale data level of the transparent subpixel to 2C, and
wherein A is a grayscale of the first color, B is a grayscale of the second color and C is a grayscale of the third color.

9. The display apparatus of claim 1 , wherein the mixed color is yellow, and
the third color is blue.

10. The display apparatus of claim 1 , wherein the mixed color is magenta, and
the third color is green.

11. The display apparatus of claim 1 , wherein the mixed color is cyan, and
the third color is red.

12. The display apparatus of claim 1 , wherein only the first light source is turned on during a first subframe, and
both the first light source and the second light source are turned on during a second subframe.

13. The display apparatus of claim 1 , wherein both the first light source and the second light source are turned on during a first subframe, and
only the second light source is turned on during a second subframe.

14. The display apparatus of claim 1 , wherein the first light source and the second light source are formed in a package.

15. The display apparatus of claim 14 , wherein the package includes a light emitting diode of the third color and a phosphor of the mixed color.

16. A method of driving a display apparatus, the method comprising:
setting grayscale data of a first subpixel having a first color, a second subpixel having a second color and a transparent subpixel;
turning on a first light source generating a first light having a mixed color of the first color and the second color; and
turning on a second light source generating a second light having a third color,
wherein a light source part includes only two kinds of light sources providing at least two different colors.

17. The method of claim 16 , wherein at least one of the first and second light sources is repeatedly turned on and off.

18. The method of claim 17 , wherein a frequency of an image displayed on the display panel including the first, second and transparent subpixels is synchronized with a frequency of turning on and off of at least one of the first and second light sources.

19. The method of claim 18 , wherein the display panel displays the image at a frame rate of at least about 120 Hz, and
at least one of the first and second light sources are repeatedly turned on and off at a frequency of at least about 120 Hz.

20. The method of claim 18 , wherein the display panel displays a three-dimensional (“3D”) image, the display panel alternately displays a left image and a right image at a frequency of at least about 120 Hz., and
at least one of the first and second light sources are repeatedly turned on and off at a frequency of at least about 240 Hz.

21. The method of claim 17 , wherein the first light source is turned on during a first subframe, and
the second light source is turned on during a second subframe.

22. The method of claim 21 , wherein during the first subframe, a grayscale data level of the first subpixel is set to A-min(A,B), a grayscale data level of the second subpixel is set to B-min(A,B) and a grayscale data level of the transparent subpixel is set to min(A,B),
during the second subframe, the grayscale data level of the transparent subpixel is set to C, and
wherein A is a grayscale of the first color, B is a grayscale of the second color, C is a grayscale of the third color and min(A,B) is a minimum value chosen as among A and B.

23. The method of claim 21 , wherein during the first subframe, a grayscale data level of the first subpixel is set to A, a grayscale data level of the second subpixel is set to B and a grayscale data level of the transparent subpixel is set to A+B,
during the second subframe, the grayscale data level of the transparent subpixel are set to 2C, and
wherein A is a grayscale of the first color, B is a grayscale of the second color and C is a grayscale of the third color.

24. The method of claim 16 , wherein the mixed color is yellow, and
the third color is blue.

25. The method of claim 16 , wherein the mixed color is magenta, and
the third color is green.

26. The method of claim 16 , wherein the mixed color is cyan, and
the third color is red.

27. The method of claim 17 , wherein only the first light source is turned on during a first subframe, and
both the first light source and the second light source are turned on during a second subframe.

28. The method of claim 17 , wherein both the first light source and the second light source are turned on during a first subframe, and

Assignees

• Samsung Display Co Ltd

Inventors

• Cho Hyun-Min
• Park Jae-Byung
• Park Hae-Il

Classifications

• G09G3/3413

  Details of control of colour illumination sources · CPC title

• G09G2310/0235

  Field-sequential colour display · CPC title

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G5/026 Primary

  Control of mixing and/or overlay of colours in general (G09G5/022 and G09G5/024 take precedence) · CPC title

• G09G3/36

  using liquid crystals · CPC title