Display apparatus and method of driving the same

Patent metadata

Field	Value
Publication number	US-10013926-B2
Application number	US-201414514945-A
Country	US
Kind code	B2
Filing date	Oct 15, 2014
Priority date	Oct 28, 2013
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A display apparatus includes a display panel including a plurality of subpixels, where each subpixel includes one of a first color filter having a first primary color, a second color filter having a second primary color and a third color filter having a third primary color, and a light source part which provides light to the display panel, where the light source part includes a first light source which generates a first light having the first primary color and a second light source which generates a second light having a mixed color of the second primary color and the third primary color, where the first light source and the second light source are alternately in a turned-on state.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel comprising a first subpixel comprising a first color filter having a first primary color, a second subpixel comprising a second color filter having a second primary color and a third subpixel comprising a third color filter having a third primary color; and
a light source part which provides light to the display panel, wherein the light source part comprises a first light source which generates a first light having the first primary color and a second light source which generates a second light having a mixed color of the second primary color and the third primary color,
wherein the first light source and the second light source are alternately in a turned-on state,
wherein the first light source is in the turned-on state and the second light source is in a turned-off state during a first subframe, such that the first subpixel represents a grayscale of the first primary color and the second subpixel and the third subpixel represent a black grayscale during the first subframe, and
wherein the second light source is in the turned-on state and the first light source is in the turned-off state during a second subframe, such that the second subpixel represents a grayscale of the second primary color, the third subpixel represents a grayscale of the third primary color and the first subpixel represents the black grayscale during the second subframe.

2. The display apparatus of claim 1 , wherein
the first primary color is green,
the second primary color is red,
the third primary color is blue, and
the mixed color is magenta.

3. The display apparatus of claim 2 , wherein
the first light source comprises a first blue light emitting diode chip and a green phosphor, and
the second light source comprises a second blue light emitting diode chip and a red phosphor.

4. A display apparatus comprising:
a display panel comprising a plurality of subpixels, wherein each subpixel comprises one of a first color filter having a first primary color, a second color filter having a second primary color and a third color filter having a third primary color; and
a light source part which provides light to the display panel, wherein the light source part comprises a first light source which generates a first light having the first primary color and a second light source which generates a second light having a mixed color of the second primary color and the third primary color,
wherein the first light source and the second light source are alternately in a turned-on state,
wherein
the first primary color is green,
the second primary color is red,
the third primary color is blue, and
the mixed color is magenta,
wherein
the first light source comprises a first blue light emitting diode chip and a green phosphor, and
the second light source comprises a second blue light emitting diode chip and a red phosphor, and
wherein a density of the green phosphor is greater than a density of the red phosphor.

5. The display apparatus of claim 3 , wherein
a peak wavelength of the green phosphor is equal to or less than 540 nanometers, and
a peak wavelength of the red phosphor is equal to or greater than 630 nanometers.

6. The display apparatus of claim 1 , wherein
the first primary color is red,
the second primary color is green,
the third primary color is blue, and
the mixed color is cyan.

7. The display apparatus of claim 6 , wherein
the first light source comprises a first blue light emitting diode chip and a red phosphor, and
the second light source comprises a second blue light emitting diode chip and a green phosphor.

8. A display apparatus comprising:
a display panel comprising a plurality of subpixels, wherein each subpixel comprises one of a first color filter having a first primary color, a second color filter having a second primary color and a third color filter having a third primary color; and
a light source part which provides light to the display panel, wherein the light source part comprises a first light source which generates a first light having the first primary color and a second light source which generates a second light having a mixed color of the second primary color and the third primary color,
wherein the first light source and the second light source are alternately in a turned-on state,
wherein
the first primary color is red,
the second primary color is green,
the third primary color is blue, and
the mixed color is cyan,
wherein
the first light source comprises a first blue light emitting diode chip and a red phosphor, and
the second light source comprises a second blue light emitting diode chip and a green phosphor, and
wherein a density of the red phosphor is greater than a density of the green phosphor.

9. The display apparatus of claim 7 , wherein
a peak wavelength of the green phosphor is equal to or less than 540 nanometers, and
a peak wavelength of the red phosphor is equal to or greater than 630 nanometers.

10. A method of driving a display apparatus, the method comprising:
setting grayscale data of a first subpixel of the display apparatus, which comprises a first color filter having a first primary color, setting grayscale data of a second subpixel of the display apparatus, which comprises a second color filter having a second primary color, and setting grayscale data of a third subpixel of the display apparatus, which comprises a third color filter having a third primary color; and
alternately turning on a first light source of the display apparatus, which generates a first light having the first primary color, and a second light source of the display apparatus, which generates a second light having a mixed color of the second primary color and the third primary color;
wherein the alternately turning on the first light source and the second light source comprises:
turning on the first light source and turning off the second light source during a first subframe, such that the first subpixel represents a grayscale of the first primary color and the second subpixel and the third subpixel represent a black grayscale during the first subframe, and
wherein the alternately turning on the first light source and the second light source further comprises:
turning on the second light source and turning off the first light source during a second subframe, such that the second subpixel represents a grayscale of the second primary color, the third subpixel represents a grayscale of the third primary color and the first subpixel represents the black grayscale during the second subframe.

11. The method of claim 10 , wherein
the first primary color is green,
the second primary color is red,
the third primary color is blue, and
the mixed color is magenta.

12. The method of claim 11 , wherein
the first light source comprises a first blue light emitting diode chip and a green phosphor, and
the second light source comprises a second blue light emitting diode chip and a red phosphor.

13. The method of claim 10 , wherein
the first primary color is red,
the second primary color is green,
the third primary color is blue, and
the mixed color is cyan.

14. The method of claim 13 , wherein
the first light source comprises a first blue light emitting diode chip and a red phosphor, and
the second light source comprises a second blue light emitting diode chip and a green phosphor.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Hyuk-Hwan
• An Jae-Sul
• Kim Hyun-Jeong
• Nam Seok-Hyun

Classifications

• G09G2310/0235

  Field-sequential colour display · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/3607

  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 title

• G09G3/3406

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

• F21Y2105/12

  characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities · CPC title