BACKLIGHT UNIT

• US 20130147364A1
• Filed: 10/30/2012
• Published: 06/13/2013
• Est. Priority Date: 12/12/2011
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Hee-Kwang Song, Seok-Hyun Nam, Young-Min Park
• Inventors: PARK, Young-Min, SONG, Hee-Kwang, NAM, Seok-Hyun
• Application Number:
  US13/664,078
• Publication Number:
  US 20130147364A1
• Time in Patent Office: Days
• US Class Current: 315/151
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: H05B 45/22 using optical feedback

Abstract

A back light unit includes a first light source which generates first light in a first wavelength range, a second light source which generates second light in a second wavelength range, and a first wavelength compensating part which adjusts a wavelength of the first light controlling a driving current, which is applied to the first light source.

Claims

1. A backlight unit comprising:

a first light source which generates first light in a first wavelength range;

a second light source which generates second light in a second wavelength range; and

a first wavelength compensating part which adjusts a wavelength of the first light by controlling a driving current, which is applied to the first light source.

2. The backlight unit of claim 1,

wherein the first wavelength compensating part decreases the wavelength of the first light by increasing the driving current applied to the first light source.

3. The backlight unit of claim 1,

wherein a shape of light supplied by the backlight unit after adjusting the first light in a color coordinate has at least about 97% correspondence with a predetermined color coordinate shape in the color coordinate.

4. The backlight unit of claim 1,

wherein the first light source generates green light.

5. The backlight unit of claim 4,

wherein the wavelength of the first light is greater than about 527.5 nanometers.

6. The backlight unit of claim 1,

wherein a wavelength of the adjusted first light is in a range of about 525 nanometers to about 527.5 nanometers.

7. The backlight unit of claim 1,

wherein the second light source generates magenta light.

8. The backlight unit of claim 1, further comprising:

a first intensity compensating part which adjusts light intensity of the first light by controlling the driving current applied to the first light source.

9. The backlight unit of claim 8,

wherein the first intensity compensating part adjusts the light intensity of the first light by adjusting a duty ratio of the driving current applied to the first light source.

10. The backlight unit of claim 9,

wherein the first intensity compensating part adjusts the duty ratio of the driving current based on an amount of light increased by the first wavelength compensating part.

11. The backlight unit of claim 1, further comprising:

a second wavelength compensating part which adjusts a wavelength of the second light by controlling a driving current, which is applied to the second light source; and

a second intensity compensating part which adjusts light intensity of the second light by compensating a duty ratio of the driving current applied to the second light source.

12. The backlight unit of claim 1, further comprising:

at least one additional light source.

13. A backlight unit comprising:

a light source which generates light;

a wavelength detecting part which detects a wavelength of the light;

a wavelength comparing part which compares a reference wavelength with a wavelength of the light of the light source; and

a wavelength compensating part which compensates the wavelength of the light when the wavelength of the light is not substantially identical to the reference wavelength such that the compensated wavelength of the light is substantially identical to the reference wavelength.

14. The backlight unit of claim 13,

wherein the wavelength compensating part reduces the wavelength of the light by increasing a driving current, which is applied to the light source.

15. The backlight unit of claim 13,

wherein a shape of the light having the compensated wavelength in a color coordinate has at least about 97% correspondence with a shape of light having the reference wavelength in the color coordinate.

16. The backlight unit of claim 13,

wherein the light source generates green light.

17. The backlight unit of claim 16,

wherein the wavelength of the light generated by the light source is greater than about 527.5 nanometers.

18. The backlight unit of claim 16,

wherein the compensated wavelength of the light compensated by the wavelength compensating part is in a range of about 525 nanometers to about 527.5 nanometers.

19. The backlight unit of claim 13, further comprising:

an intensity compensating part which adjusts a duty ratio of a driving current, which is applied to the light source.

20. The backlight unit of claim 19,

wherein the intensity compensating part reduces the duty ratio of the driving current based on an amount of light increased by the wavelength compensating part.