LIGHTING DEVICE, DISPLAY DEVICE AND TELEVISION RECEIVER

• US 20120057095A1
• Filed: 02/23/2010
• Published: 03/08/2012
• Est. Priority Date: 05/15/2009
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kuromizu, Yasumori
• Application Number:
  US13/318,841
• Publication Number:
  US 20120057095A1
• Time in Patent Office: Days
• US Class Current: 349/61
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity

Abstract

A lighting device of the present invention achieves power saving and provides illumination light without having local dark portions. A lighting device 12 of the present invention includes an elongated light source 17, a chassis 14 configured to house the light source 17 and have an opening 14b for light from the light source 17 to pass through, an optical member 15a provided to face the light source 17 and cover the opening 14b and having an edge portion 15e on an end in a longitudinal direction of the light source 17, and a first light reflecting portion 50 configured to reflect the light from the light source 17 and provided in the edge portion 15e such that light reflectance of the edge portion 15e is relatively higher than that of a portion adjacent to the edge portion 15e.

Claims

1. A lighting device comprising:

a linearly formed light source;

a chassis configured to house the light source and have an opening for light from the light source to pass through;

an optical member provided to face the light source and cover the opening and having an edge portion on an end in a longitudinal direction of the linearly formed light source; and

a first light reflecting portion configured to reflect the light from the light source and provided in the edge portion such that light reflectance of the edge portion is relatively higher than that of a portion adjacent to the edge portion.

2. The lighting device according to claim 1, wherein the light reflectance of the first light reflecting portion is uniform in the edge portion.

3. The lighting device according to claim 1, the first light reflecting portion is configured by a dot pattern having light reflectivity.

4. The lighting device according to claim 1, wherein a length of a luminous range of the light source from which light is emitted is smaller than a length of the optical member in the longitudinal direction of the light source.

5. The lighting device according to claim 1, wherein the optical member includes a light source overlapping portion that overlaps the light source and an empty area overlapping portion that does not overlap the light source,

the lighting device further comprising:

a second light reflecting portion formed at least in the light source overlapping portion of the optical member such that the light reflectance of the light source overlapping portion is relatively hither than the light reflectance of the empty area overlapping portion, the second light reflecting portion configured to reflect the light from the light source.

6. The lighting device according to claim 5, wherein the second light reflecting portion is configured by a dot pattern having light reflectivity.

7. The lighting device according to claim 5, wherein light reflectance of the second light reflectance decreases in a continuous and gradual manner from a portion having higher light reflectance toward a portion having lower light reflectance.

8. The lighting device according to claim 5, wherein light reflectance of the second light reflectance decreases in a stepwise and gradual manner from a portion having higher light reflectance toward a portion having lower light reflectance.

9. The lighting device according to claim 1, wherein:

the chassis has a surface facing the optical member and including at least a first end portion, a second end portion, and a middle portion, the second end portion being located at an end away from the first end portion, and the middle portion being located between the first end portion and the second end portion;

at least one of the first end portion, the second end portion and the middle portion is configured as a light source installation area in which the light source is arranged, and the rest is configured as an empty area in which no light source is arranged.

10. The lighting device according to claim 9, wherein in the chassis, the light source installation area is smaller than the empty area.

11. The lighting device according to claim 9, wherein the light source installation area is provided in the middle portion of the chassis.

12. The lighting device according to claim 1, wherein the optical member is a light diffusing member for diffusing light from the light source.

13. A display device comprising:

the lighting device according to claim 1; and

a display panel configured to provide display using light from the lighting device for a display device.

14. The display device according to claim 13, wherein the display panel is a liquid crystal display panel using liquid crystal.

15. A television receiver comprising the display device according to claim 13.