Lighting device, display device and television device

• US 9,116,387 B2
• Filed: 08/24/2011
• Issued: 08/25/2015
• Est. Priority Date: 08/31/2010
• Status: Expired due to Fees

• 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): May, Robert
• Assistant Examiner(s): Gyllstrom, Bryon T
• Application Number:
  US13/817,669
• Publication Number:
  US 20130148035A1
• Time in Patent Office: 1,462 Days
• Field of Search: 362 971- 974
• US Class Current: 1/1
• 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

Abstract

A backlight unit includes a chassis, a plurality of LED light sources, and a reflection member. The chassis includes a bottom plate and side plates, and has an opening on a front surface side. The LED light sources are arranged in a matrix on a front surface of the bottom plate of the chassis. The reflection member includes a plurality of through holes through which the respective LED light sources are passed and side wall portions having inclined surfaces on the sides thereof. The side wall portions provided in the end portion of the bottom plate of the chassis has a height greater than a height of the side wall portions provided in the middle portion of the bottom plate, and surround each of the LED light sources. The inclined surfaces lead light from the light sources toward the opening side of the chassis.

Claims

1. A lighting device, comprising:

a chassis including a bottom plate and side plates, the bottom plate having peripheral end portions, the side plates rising 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, each of 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 passable, 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 provided close to the peripheral end portion of the bottom plate having a height greater than a height of the side wall portions arranged close to a middle portion of the bottom plate,

wherein the side wall portions of the reflection member gradually increase in height as if closer to the middle portion from the peripheral end portion of the bottom plate of the chassis.

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

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

4. The lighting device according to claim 1, wherein

each of the side wall portions of the reflection member has an edged tip end, and

each inclined surface of the side wall portions of the reflection member provided in the middle portion of the bottom plate of the chassis is inclined with respect to a front direction of the light sources at an angle that is smaller than an angle at which the inclined surface of the side wall portions of the reflection member provided in the peripheral end portion inclined with respect to the front direction of the light sources.

5. The lighting device according to claim 1, wherein the height of the side wall portions increases at a regular ratio.

6. The lighting device according to claim 1, further comprising an optical member through which the light from the light sources is passable 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.

7. 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.

8. The lighting device according to claim 7, wherein the inclined surfaces of the reflection member are inclined with respect to the front direction of the light sources at an angle smaller than an angle formed between the light having the peak light intensity and the front direction.

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

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 10, wherein the display panel is a liquid crystal panel using liquid crystals.

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