LIGHT SOURCE DEVICE

• US 20110205727A1
• Filed: 03/04/2011
• Published: 08/25/2011
• Est. Priority Date: 04/10/2010
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: KIM, Yun Ha, LEE, Sang Hoon, SHIN, Hyunha
• Granted Patent: US 9,541,695 B2
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area

Abstract

Disclosed is a light source device. The light source device includes:

• • a light guide plate;
  • a reflector disposed under the light guide plate;
  • a light source unit optically coupled to the light guide plate; and
  • a photo luminescent film disposed between the light guide plate and the light source unit, wherein the photo luminescent film includes at least two partitioned areas, and wherein a first fluorescent material included in at least one area of the at least two areas is different from a second fluorescent material included in the other areas.

Claims

1. A light source device comprising:

a light guide plate;

a reflector disposed under the light guide plate;

a light source unit optically coupled to the light guide plate; and

a photo luminescent film disposed between the light guide plate and the light source unit, wherein the photo luminescent film comprises at least two partitioned areas, and wherein a first fluorescent material comprised in at least one area of the at least two areas is different from a second fluorescent material comprised in the other areas.

2. The light source device of claim 1, wherein the light guide plate comprises a pattern formed on one side thereof, and wherein the pattern diffuses or scatters light.

3. The light source device of claim 1, wherein the first fluorescent material and the second fluorescent material are alternately arranged in the longitudinal direction of the photo luminescent film.

4. The light source device of claim 1, wherein the light source unit comprises a plurality of light emitting devices arranged in a line, and wherein the plurality of light emitting devices are disposed corresponding respectively to the first fluorescent material or the second fluorescent material in the order of the first fluorescent material—

the second fluorescent material—

the first fluorescent material—

the second fluorescent material which are comprised in the photo luminescent film.

5. The light source device of claim 1, wherein the light source unit comprises a plurality of white light emitting devices arranged in a line.

6. The light source device of claim 1, wherein the light source unit comprises a plurality of light emitting devices arranged in a line, wherein the plurality of the light emitting devices are comprised of a warm white LED and a cool white LED.

7. The light source device of claim 6, wherein the warm white LED emits a correlated color temperature within a range between 2,000 K and 3,000 K, and the cool white LED emits a correlated color temperature within a range between 5,500 K and 6,500 K.

8. The light source device of claim 1, wherein the light guide plate comprises a first light guide plate and a second light guide plate, wherein the light source unit comprises a first light source unit and a second light source unit, wherein the photo luminescent film comprises a first photo luminescent film and a second photo luminescent film, and wherein the first photo luminescent film is disposed between the first light guide plate and the first light source unit, and the second photo luminescent film is disposed between the second light guide plate and the second light source unit.

9. The light source device of claim 8, wherein a first fluorescent material and a second fluorescent material, which are comprised in both the first photo luminescent film and the second photo luminescent film, are partitioned and randomly arranged.

10. The light source device of claim 8, wherein a first fluorescent material and a second fluorescent material, which are comprised in both the first photo luminescent film and the second photo luminescent film, are arranged in a grid pattern.

11. The light source device of claim 8, wherein the first light guide plate comprise a first pattern and the second light guide plate comprise a second pattern thereinside in order to diffuse or scatter light, and wherein the first pattern and the second pattern are not overlapped with each other.

12. The light source device of claim 8, wherein the plurality of the light emitting devices comprised in the first light source unit are warm white LEDs, and wherein the plurality of the light emitting devices comprised in the second light source unit are cool white LEDs.

13. The light source device of claim 8, wherein a plurality of the light emitting devices comprised in the first light source unit correspond to a warm white LED and a cool white LED, wherein a plurality of the light emitting devices comprised in the second light source unit correspond to a warm white LED and a cool white LED, wherein the warm white LED and the cool white LED comprised in the first light source unit are alternately arranged, and wherein the warm white LED and the cool white LED comprised in the second light source unit are alternately arranged.

14. The light source device of claim 1, wherein the photo luminescent film comprises a transparent resin layer comprising a fluorescent material and comprises a protective film disposed on the transparent resin layer, and wherein the transparent resin layer comprises a diffusing agent.

15. The light source device of claim 14, wherein the fluorescent material comprises at least one of a garnet based material, a silicate based material, a nitride based material and an oxynitride based material.

16. A light source device comprising:

a light guide plate;

a reflector disposed under the light guide plate;

a plurality of light emitting devices optically coupled to the light guide plate; and

a photo luminescent film disposed between the light guide plate and the light source unit, wherein the plurality of light emitting devices comprise a warm white LED emitting a correlated color temperature within a range between 2,000 K and 3,000 K, and comprise a cool white LED emitting a correlated color temperature within a range between 5,500 K and 6,500 K, and wherein the warm white LED and the cool white LED are disposed in the longitudinal direction of the photo luminescent film.

17. The light source device of claim 16, wherein a first fluorescent material and a second fluorescent material different from the first fluorescent material are partitioned and randomly arranged in the photo luminescent film in the longitudinal direction of the photo luminescent film.

18. The light source device of claim 17, wherein the first fluorescent material and the second fluorescent material are alternately arranged in the longitudinal direction of the photo luminescent film.

19. A light source device comprising:

a light guide plate;

a light source unit optically coupled to a side of the light guide plate; and

a photo luminescent film converting a wavelength of light emitted from the light source unit and emitting the light to the light guide plate, wherein a first fluorescent material and a second fluorescent material different from the first fluorescent material are partitioned and randomly arranged in the photo luminescent film in the longitudinal direction of the photo luminescent film.

20. The light source device of claim 19, wherein the light source unit comprises a plurality of light emitting devices arranged in a line, wherein the plurality of the light emitting devices are comprised of a warm white LED and a cool white LED which are alternately disposed.