Liquid crystal display unit

• US 8,159,629 B2
• Filed: 05/28/2009
• Issued: 04/17/2012
• Est. Priority Date: 09/18/2008
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamashita, Yoshiharu, Morishima, Akitoshi, Sato, Katsunari, Nishijima, Noriyo, Ohashi, Shigeo, Miitsu, Takeshi, Ogura, Hiroyoshi, Hosono, Hiroki, Sato, Koichi
• Primary Examiner(s): Peace, Rhonda
• Application Number:
  US12/473,459
• Publication Number:
  US 20100066937A1
• Time in Patent Office: 1,055 Days
• Field of Search: 349 58- 60, 349/62, 349/64, 349/65
• US Class Current: 349/58
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64

Abstract

There is provided a slim liquid crystal display unit having a large screen by providing a slim structure capable of sufficiently radiating the heat from a light source. The liquid crystal display unit according to the present invention includes: a liquid crystal panel; an optical guiding board installed on a rear face thereof; a pair of light source-mounted substrate disposed, opposing right and left side faces thereof; a light source mounted on the light source-mounted substrate; a metal frame connected on the opposite side to the optical guiding board of the light source-mounted substrate; a chassis member for supporting the optical guiding board and a reflection sheet group; and a thermal diffusion member fixed onto the metal frame along with the chassis member. The chassis member has a stepped portion in the vicinity of the light source. Between the stepped portion and the reflection sheet group, a thermal insulation member is attached.

Claims

1. A liquid crystal display unit with a liquid crystal panel comprising:

a light source disposed on an end side of the liquid crystal panel to apply light from the end side toward a center side of the liquid crystal panel;

an optical guiding board disposed on a rear face side of the liquid crystal panel and guiding the light from the light source to a display face side of the liquid crystal panel;

a chassis member disposed on a rear face side of the optical guiding board and supporting the optical guiding board; and

a thermal conductor for transferring the heat of the light source to the chassis member,

wherein a thermal insulation member is attached between a predetermined region on an end side of the chassis member and the optical guiding board.

2. The liquid crystal display unit according to claim 1, wherein a stepped portion is formed at the chassis member to form a space for storing the thermal insulation member between the predetermined region on the end side of the chassis member and the optical guiding board.

3. The liquid crystal display unit according to claim 1, wherein a reflection sheet for reflecting the light passing through the light source or the optical guiding board toward the liquid crystal panel side is attached between the rear face side of the optical guiding board and the thermal insulation member and the chassis member.

4. The liquid crystal display unit according to claim 1, wherein a radiation unit for radiating heat of the chassis member is attached to a rear face of the chassis member.

5. The liquid crystal display unit according to claim 4, wherein the radiation unit includes a radiation frame in contact with a rear face of the chassis member end side in a predetermined region, a fin attached onto a rear face of a center portion of the chassis member and a thermal diffusion member in contact with the radiation frame and the fin.

6. The liquid crystal display unit according to claim 5, wherein the thermal diffusion member is a heat pipe for passing liquid therethrough, the heat of the chassis member end side in a predetermined region is transferred to the radiation frame and the heat transferred to the radiation frame is transferred to the fin through the heat pipe and hence the heat of the light source is diffused to the center portion of the chassis member through the heat pipe.

7. The liquid crystal display unit according to claim 1, wherein the light source is a plurality of light emitting diodes.

8. The liquid crystal display unit according to claim 1, wherein the light source is disposed on one or both of right and left end sides of the liquid crystal panel.

9. The liquid crystal display unit according to claim 1, wherein the light source is disposed on one or both of upper and lower end sides of the liquid crystal panel.

10. The liquid crystal display unit according to claim 1, wherein the thermal insulation member is a reflective thermal insulation member having a function capable of reflecting light.

11. A liquid crystal display unit with a liquid crystal panel comprising:

a light source disposed on right and left end sides of the liquid crystal panel to apply light from both right and left ends toward a center portion of the liquid crystal panel;

an optical guiding board disposed on a rear face side of the liquid crystal panel and guiding the light from the light source to a display face side of the liquid crystal panel;

a chassis member disposed on a rear face side of the optical guiding board and supporting the optical guiding board; and

a thermal conductor for transferring the heat of the light source to the chassis member,

wherein a portion in the vicinity of an end portion, at which the light source is disposed, of the chassis member is made into a protruding portion protruding to a rear face side of the liquid crystal display unit and a thermal insulation member for preventing the heat transferred from the light source to the end of the chassis member from transferring to the optical guiding board is attached in a space between the chassis member formed by the protruding portion and the optical guiding board.

12. The liquid crystal display unit according to claim 11, wherein the thermal insulation member is sponge.

13. The liquid crystal display unit according to claim 11, wherein the thermal insulation member is made of a foamed resin including therein air bubbles.

14. A liquid crystal display unit comprising:

a liquid crystal panel;

a LED light source disposed on at least one end portion of a display face thereof, a LED light source block provided with the LED light source;

an optical guiding board guiding, to the liquid crystal panel, the light from the LED light source disposed on an rear face side of the liquid crystal panel;

a reflection sheet provided on a rear face side of the optical guiding board; and

a chassis member for fixing the LED light source block and retaining the optical guiding board and the reflection sheet from a rear face side, wherein

at an end portion on which the LED light source block of the chassis member is disposed, there is provided;

a protrusion portion extending at least from the LED light source block to at least parts of the optical guiding board and the reflection sheet; and

a reflective thermal insulation member provided on the protrusion portion and fixed to the chassis member, extending from the end portion of the LED light source block to at least parts of the optical guiding board and the reflection sheet.

15. The liquid crystal display unit according to claim 14, wherein the reflective thermal insulation member is formed with:

a reflecting surface provided on a face opposing to the liquid crystal panel;

a heat insulating layer provided on a side where the reflection thermal insulation member is fixed on the chassis member.

16. The liquid crystal display unit according to claim 14, wherein the reflective thermal insulation member is formed from a laminated body of the reflection sheet and a thermal insulation member.

17. The liquid crystal display unit according to claim 14, wherein the reflective thermal insulation member is formed with:

a reflecting surface provided on a face opposing to the liquid crystal panel;

a hollow portion provided in at least a part of a side on which the reflective thermal insulation member is fixed on the chassis member.

18. The liquid crystal display unit according to claim 14, wherein reflective thermal insulation member is in slidable contact with the optical guiding board and the reflection sheet.

19. A liquid crystal display unit with a liquid crystal panel comprising:

a light source disposed on an end side of the liquid crystal panel to apply light from the end side toward a center side of the liquid crystal panel;

an optical guiding board disposed on a rear face side of the liquid crystal panel and guiding the light from the light source to a display face side of the liquid crystal panel;

a chassis member disposed on a rear face side of the optical guiding board and supporting the optical guiding board;

a thermal conductor for transferring the heat of the light source to the chassis member;

a driver for driving the light source,

wherein the chassis member is formed therein with a protruding portion projected toward the rear surface side of the liquid crystal display unit, in a region near to the end side of the liquid crystal panel, at which the light source is located, so as to define a space between the chassis member and the optical guiding board within the thus formed protruding portion, there being a thermal insulation member attached in the space for preventing a heat transmitted to the end side of the chassis member from the light source, from being transmitted to the optical guiding board, and the driver is disposed on the rear face of the chassis member at a center side of the liquid crystal display unit being off from the thermal insulation member and the protruding portion.

20. The liquid crystal display unit according to claim 19, further comprising:

a light source-mounted substrate on which the light source is mounted,

wherein the thermal conductor is formed of a metal frame which is coupled thereto with both light source-mounted substrate and chassis member so as to transmit a heat from the light source to the chassis member through the intermediary of the metal frame.