Lighting device, display device and television device

• US 8,789,959 B2
• Filed: 08/24/2011
• Issued: 07/29/2014
• Est. Priority Date: 08/31/2010
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Shimizu, Takaharu
• Primary Examiner(s): Green, Tracie Y
• Application Number:
  US13/817,691
• Publication Number:
  US 20130148036A1
• Time in Patent Office: 1,070 Days
• Field of Search: 362/97.1, 362/612, 362/616, 313498-512, 445 24- 25
• US Class Current: 362/97.1
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G09F 13/14 Arrangements of reflectors therein
• CPC Class Codes: H04N 5/64 Constructional details of receivers, e.g. cabinets or dust covers furniture aspects of television cabinets A47B81/06
• CPC Class Codes: H04N 5/66 Transforming electric information into light information scanning details H04N3/00

Abstract

A backlight unit includes a chassis, LED light sources, and a reflection member. The LED light sources are arranged in a matrix on a bottom plate of the chassis. The reflection member includes side wall portions and through holes through which the LED light sources are passed. The side wall portions surround each of the LED light sources passing through the respective through holes. The side wall portions have inclined surfaces on side surfaces thereof that lead light from the LED light sources toward the opening side of the chassis. Each of the side wall portions located between the LED light sources that are adjacently positioned in a diagonal direction has a height greater than a height of each of the side wall portions located between the LED light sources that are adjacently positioned in a vertical direction or in a horizontal direction.

Claims

1. A lighting device comprising:

a chassis including a bottom plate and side plates, the bottom plate having peripheral end portions, and the side plates that rise from the peripheral end portions toward a first main surface side of the bottom plate, the chassis having an opening on the first main surface side;

a plurality of light sources arranged on the first main surface side of the bottom plate of the chassis in a matrix, the light sources configured to emit light toward an opening side of the chassis; and

a reflection member having side wall portions and a plurality of through holes through which the respective light sources are passed, the side wall portions surrounding each of the light sources,

each of the side wall portions having an inclined surface on a side surface thereof, the inclined surface being inclined from a surface on which the light sources are mounted toward the opening side of the chassis, and the inclined surface configured to direct light from the light sources toward the opening side of the chassis, and

the side wall portions being located between the light sources that are adjacently positioned in a diagonal direction having a height greater than a height of the side wall portions located between the light sources that are adjacently positioned in a vertical direction or in a horizontal direction with a plan view.

2. The lighting device according to claim 1, wherein the side wall portions located between the light sources that are adjacently positioned in the diagonal direction have top ends and the top ends are tapered so as to be narrower toward a center between the light sources that are adjacently positioned in the diagonal direction with a plan view.

3. The lighting device according to claim 1, wherein top ends of the side wall portions that are located between the light sources that are adjacently positioned in the vertical direction or in the horizontal direction are flat surfaces parallel to the bottom plate of the chassis with a plan view.

4. The lighting device according to claim 1, further comprising an optical member through which the light from the light sources passes and arranged on the opening side of the chassis such that a space is provided between the optical member and top ends of the side wall portions of the reflection member.

5. The lighting device according to claim 1, wherein each of the light sources has a light intensity distribution in which light having a peak light intensity travels in a direction inclined with respect to a front direction.

6. The lighting device according to claim 5, wherein the inclined surface of the reflection member is inclined with respect to the front direction of the light source at an angle smaller than an angle formed between the light having the peak light intensity and the front direction.

7. The lighting device according to claim 1, wherein the side wall portions of the reflection member surround each of the light sources separately in a grid in a plan view.

8. The lighting device according to claim 1, wherein the light sources are arranged at regular intervals.

9. The lighting device according to claim 1, wherein the side wall portions surround each of the light sources with a uniform area size.

10. A display device comprising:

a display panel configured to provide display using light from the lighting device according to claim 1.

11. The display device according to claim 9, wherein the display panel is a liquid crystal panel using liquid crystals.

12. A television device comprising the display device according to claim 10.