Liquid crystal display device and television set

• US 8,534,859 B2
• Filed: 06/30/2011
• Issued: 09/17/2013
• Est. Priority Date: 06/30/2010
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Imajo, Ikuko, Baba, Masashi, Yamazaki, Sachiko
• Primary Examiner(s): HAN, JASON
• Application Number:
  US13/173,044
• Publication Number:
  US 20120002118A1
• Time in Patent Office: 810 Days
• Field of Search: 362 971- 974
• US Class Current: 362/97.3
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

Provided is a liquid crystal display device, including: a liquid crystal panel having a display region; and a backlight unit disposed below the liquid crystal panel, in which: the backlight unit includes: at least one mounting substrate on which light emitting diodes are mounted; a radiator plate; and a reflection member; the reflection member has a reflection surface which is formed to have a recess surface shape; the light emitting diodes on the at least one mounting substrate are disposed on a bottom portion of the reflection surface; the at least one mounting substrate is disposed at a position under the bottom portion; the radiator plate is disposed under the at least one mounting substrate; and the radiator plate has, in plan view, a larger area than the at least one mounting substrate and a smaller area than the display region.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal panel having a display region at which an image is displayed; and

a backlight unit disposed below the liquid crystal panel, wherein;

the backlight unit comprises;

at least one mounting substrate on which a plurality of light emitting diodes are mounted;

a radiator plate; and

a reflection member;

the reflection member has a reflection surface which is formed to have a recess surface shape below the liquid crystal panel;

the plurality of light emitting diodes on the at least one mounting substrate are disposed on a bottom portion of the reflection surface which is formed to have the recess surface shape;

the at least one mounting substrate is disposed at a position on an outer side of the reflection surface in the recess surface shape and under the bottom portion;

the at least one mounting substrate comprises a plurality of mounting substrates;

any two mounting substrates of the plurality of mounting substrates are disposed with an interval provided therebetween;

the radiator plate has a hollow through hole formed between the any two mounting substrates disposed with the interval provided therebetween;

the radiator plate is disposed under the at least one mounting substrate; and

the radiator plate has, in plan view, a larger area than the at least one mounting substrate and a smaller area than the display region of the liquid crystal panel.

2. The liquid crystal display device according to claim 1, further comprising a casing for covering the radiator plate and the reflection member from outer sides thereof,

wherein the radiator plate is attached to the casing under a state in which a bottom surface of the radiator plate is brought into contact with the casing.

3. The liquid crystal display device according to claim 1, wherein:

the bottom portion of the reflection surface is formed flat so that the reflection member is brought into contact with a top surface of the at least one mounting substrate;

the reflection surface which is formed to have the recess surface shape has inclined surfaces formed continuously with the bottom portion; and

the radiator plate overlaps a part of the inclined surfaces in plan view.

4. The liquid crystal display device according to claim 3, wherein the radiator plate has a larger area than the bottom portion in plan view, to thereby overlap the part of the inclined surfaces.

5. The liquid crystal display device according to claim 1, wherein:

each of the any two mounting substrates has a linear shape; and

the hollow through hole is formed in a groove shape between the any two mounting substrates.

6. The liquid crystal display device according to claim 1, wherein:

each of the any two mounting substrates has a linear shape along a long-side direction of the liquid crystal panel; and

the hollow through hole is formed in a groove shape along the long-side direction of the liquid crystal panel.

7. The liquid crystal display device according to claim 1, wherein:

each of the any two mounting substrates has a linear shape;

at least one of the any two mounting substrates has a first mounting portion and a second mounting portion on which the plurality of light emitting diodes are mounted in a higher density than in the first mounting portion; and

the hollow through hole is formed in a groove shape along the second mounting portion.

8. The liquid crystal display device according to claim 6, wherein:

the any two mounting substrates are linearly arranged;

one of the any two mounting substrates is disposed in a manner offset to one side in the long-side direction;

another of the any two mounting substrates is disposed in a manner offset to another side in the long-side direction; and

the hollow through hole is formed in a groove shape between portions opposed to each other of the any two mounting substrates.

9. The liquid crystal display device according to claim 7, wherein the second mounting portion is disposed at a position closer to a center of the liquid crystal panel in the long-side direction than the first mounting portion.

10. The liquid crystal display device according to claim 2, wherein the casing and the radiator plate are formed flat in portions contacting to each other.

11. The liquid crystal display device according to claim 10, wherein:

the casing has a through hole in the portion contacting to the bottom surface of the radiator plate;

the radiator plate has a screw hole in the portion contacting to the casing; and

the radiator plate is fixed to the casing by inserting a screw into the screw hole of the radiator plate via the through hole of the casing.

12. A television set, comprising the liquid crystal display device according to claim 1, the television set being formed so as to receive a radio wave for television broadcast to display an image and output sound.