Display device

• US 9,812,072 B2
• Filed: 04/20/2016
• Issued: 11/07/2017
• Est. Priority Date: 08/17/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Cho, Hyunmin, Kang, Jonghyuk, Kim, Daehyun, Park, Jaebyung, Byun, Jinseob, Im, Hyundeok, Jung, Keun-tae, Hong, Sung-jin
• Primary Examiner(s): Cheng, Joe H
• Application Number:
  US15/133,630
• Publication Number:
  US 20170053605A1
• Time in Patent Office: 566 Days
• 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

Abstract

A display device includes a driving unit which outputs a driving signal, and a display panel which displays an image with at least red light, green light, and blue light in response to the driving signal where the blue light includes first color light and second color light, and a peak wavelength of the first color light is about 390 nanometers (nm) to about 410 nm and a peak wavelength of the second color light is about 480 nm to about 491 nm.

Claims

1. A display device comprising:

a driving unit which outputs a driving signal; and

a display panel which displays an image with at least one of a red light, a green light, and a blue light in response to the driving signal,

wherein

the blue light comprises a first color light and a second color light; and

a peak wavelength of the first color light is about 390 nanometers to about 410 nanometers and a peak wavelength of the second color light is about 480 nanometers to about 491 nanometers.

2. The display device of claim 1, wherein a half width of the first color light is about 17 nanometers to about 25 nanometers.

3. The display device of claim 2, wherein a half width of the second color light is about 17 nanometers to about 23 nanometers.

4. The display device of claim 3, further comprising a light source unit which is disposed under the display panel and provides a light to the display panel.

5. The display device of claim 4, wherein the light source unit comprises a first light source which emits the red light, a second light source which emits the green light, and a third light source which provides the blue light.

6. The display device of claim 5, wherein the third light source comprises a first light emitting diode which emits the first color light and a second light emitting diode which emits the second color light.

7. The display device of claim 6, wherein

the display panel displays the image corresponding to one screen by a frame unit;

the frame unit comprises sequentially-divided first to third sub frames; and

the first light source is turned on during the first sub frame, the second light source is turned on during the second sub frame, and the third light source is turned on during the third sub frame.

8. The display device of claim 7, wherein

the third sub frame comprises sequentially-divided first and second sub fields;

and

the first light emitting diode is turned on during the first sub field and the second light emitting diode is turned on during the second sub field.

9. The display device of claim 7, wherein each of the first light emitting diode and the second light emitting diode is turned on during the third sub frame.

10. The display device of claim 6, wherein

the display panel displays the image corresponding to one screen by a frame unit;

and

each of the first to third light sources is turned on during the frame unit.

11. The display device of claim 10, wherein each of the first light emitting diode and the second light emitting diode is turned on during the frame unit.

12. The display device of claim 10, wherein

the frame unit comprises sequentially-divided third and fourth sub fields;

and

the first light emitting diode is turned on during the third sub field and the second light emitting diode is turned on during the fourth sub field.

13. The display device of claim 4, wherein the light source unit comprises a first light source which emits the red light, a second light source which emits the green light, a third light source which emits the first color light, and a fourth light source which emits the second color light.

14. The display device of claim 4, wherein the display panel comprises a red pixel which displays a red image, a green pixel which displays a green image, and a blue pixel which displays a blue image,

wherein the red pixel comprises a red light emitting layer which emits the red light, the green pixel comprises a green light emitting layer which emits the green light, and the blue pixel comprises a blue light emitting layer which provides the blue light.

15. The display device of claim 14, wherein the blue light emitting layer comprises a first organic light emitting material which emits the first color light and a second organic light emitting material which emits the second color light.

16. The display device of claim 15, wherein the blue light emitting layer is provided as a single layer, and the first organic light emitting material and the second organic light emitting material are mixed and disposed at the blue light emitting layer.

17. The display device of claim 15, wherein the blue light emitting layer comprises a first light emitting layer and a second light emitting layer disposed on the first light emitting layer;

and

the first organic light emitting material is disposed at the first light emitting layer and the second organic light emitting material is disposed at the second light emitting layer.

18. The display device of claim 14, wherein the blue pixel comprises a first sub pixel and a second sub pixel disposed adjacent to each other.

19. The display device of claim 18, wherein the first sub pixel and the second sub pixel are provided with a smaller area than that of the red pixel and that of the green pixel.

20. A display device comprising:

a driving unit which outputs a driving signal; and

a display panel which displays an image with a red light, a green light, a first color light, and a second color light sequentially provided in response to the driving signal,

wherein a peak wavelength of the first color light is about 390 nanometers to about 410 nanometers, a peak wavelength of the second color light is about 480 nanometers to about 491 nanometers, and the first color light and the second color light are mixed and seen as a blue light.