Lighting device, display device, and television receiver

• US 8,827,478 B2
• Filed: 06/16/2010
• Issued: 09/09/2014
• Est. Priority Date: 11/06/2009
• 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: Kuromizu, Yasumori
• Primary Examiner(s): Patel, Nimeshkumar
• Assistant Examiner(s): ZIMMERMAN, GLENN D
• Application Number:
  US13/502,811
• Publication Number:
  US 20120212682A1
• Time in Patent Office: 1,546 Days
• Field of Search: 349/64, 349/67, 349/612, 405/46, 405/82, 405/49, 405/73, 362/97.1, 362/97.2, 362/97.3, 362/296.04, 362/612, 348/739
• US Class Current: 362/97.1
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: G02B 19/0095 for use with ultraviolet radiation
• CPC Class Codes: G02B 3/08 with discontinuous faces, e.g. Fresnel lens diffractive Fresnel lenses G02B5/1876
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members

Abstract

A backlight unit which is a lighting device is provided with: a diffusion plate; a chassis having rising sections which are provided at the outer periphery of the main flat surface thereof and supporting the diffusion plate; light-emitting modules disposed at the main flat surface and the rising sections of the chassis and applying light to the diffusion plate; and reflecting sheets disposed at the main flat surface and the rising sections of the chassis and reflecting the light, which is emitted from the light-emitting modules, toward the diffusion plate. The reflecting sheets have formed thereon sloped sections for reflecting, toward the diffusion plate, the light emitted from the light-emitting modules disposed at the rising sections.

Claims

1. A lighting device, comprising:

a diffusion plate;

a chassis that has a raised portion on an outer periphery of a main flat surface thereof and supports the diffusion plate;

a light source that is disposed on each of the main flat surface and the raised portion of the chassis and irradiates the diffusion plate with light; and

a reflection sheet that is disposed on the main flat surface of the chassis and reflects light emitted by the light source toward the diffusion plate;

wherein

the light source disposed on the raised portion is disposed so as to be inclined toward the reflection sheet in order to emit light toward the reflection sheet.

2. The lighting device according to claim 1, wherein

the light source disposed on the raised portion is disposed so as to be oriented to a center side of the main flat surface of the chassis in order to focus light to the center side of the main flat surface of the chassis.

18. The lighting device according to claim 1, wherein

the light source is constituted by a light emitting module including a mounting substrate and a light emitting element disposed on the mounting substrate.

19. The lighting device according to claim 18, wherein

a plurality of light emitting elements are disposed side by side on the mounting substrate.

20. The lighting device according to claim 18, wherein

the light emitting element is an LED.

21. The lighting device according to claim 20, wherein

the LED is obtained by applying a phosphor having a light emission peak in a yellow region to a blue light emitting chip to gain white light.

22. The lighting device according to claim 20, wherein

the LED is obtained by applying phosphors having light emission peaks in green and red regions, respectively, to a blue light emitting chip to gain white light.

23. The lighting device according to claim 20, wherein

the LED is obtained by applying a phosphor having a light emission peak in a green region to a blue light emitting chip and by using the blue light emitting chip in combination with a red light emitting chip to gain white light.

24. The lighting device according to claim 20, wherein

the LED is obtained by using, in combination, light emitting chips of respective colors of blue, green, and red to gain white light.

25. The lighting device according to claim 20, wherein

the LED is obtained by using an ultraviolet light chip in combination with a phosphor.

26. The lighting device according to claim 20, wherein

the LED is obtained by applying phosphors having light emission peaks in blue, green, and red regions, respectively, to an ultraviolet light chip to gain white light.

27. The lighting device according to claim 18, wherein

in the light emitting module, on an opposite side to a side of the chassis, a diffusion lens that diffuses light from the light emitting element is disposed at a position coinciding with the light emitting element when seen in a plan view.

28. The lighting device according to claim 18, wherein

a plurality of the mounting substrates are disposed, and each pair of adjacent ones of the mounting substrates are connected to each other with a connector.

29. The lighting device according to claim 28, wherein

the mounting substrates are connected to a power source via the connector.

30. A display device, comprising:

the lighting device according to claim 1; and

a display panel that receives light from the lighting device.

31. The display device according to claim 30, wherein

the display panel is a liquid crystal display panel.

32. A television receiver comprising the display device according to claim 30.

3. A lighting device, comprising:

a diffusion plate;

a chassis that has a raised portion on an outer periphery of a main flat surface thereof and supports the diffusion plate;

a light source that is disposed on each of the main flat surface and the raised portion of the chassis and irradiates the diffusion plate with light; and

a reflection sheet that is disposed on the main flat surface of the chassis and reflects light emitted by the light source toward the diffusion plate;

wherein

on the reflection sheet, an inclined portion is formed that reflects light emitted by the light source disposed on the raised portion toward the diffusion plate.

4. The lighting device according to claim 3, wherein

the inclined portion has a substantially triangular cross section.

5. The lighting device according to claim 3, wherein

the inclined portion has a dome-shaped cross section.

6. The lighting device according to claim 3, wherein

the inclined portion has a substantially trapezoidal cross section.

7. The lighting device according to claim 3, wherein

a cut-and-raised piece formed by making a cut in the reflection sheet and by raising a resulting cut portion of the reflection sheet toward the diffusion plate constitutes the inclined portion.

8. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of an H-shape.

9. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of an X-shape.

10. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of such a shape as to form the cut-and-raised piece in an L-shape.

11. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of such a shape as to form the cut-and-raised piece in a concave shape.

12. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of such a shape as to form the cut-and-raised piece in a convex shape.

13. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of such a shape as to form the cut-and-raised piece in a triangular shape.

14. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of such a shape as to form the cut-and-raised piece in a quadrangular shape.

15. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of such a shape as to form the cut-and-raised piece in a claw shape.

16. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of a shape of a straight line.

17. The lighting device according to claim 7, wherein

the cut made in the reflection sheet is of a shape of a curve.