LIQUID CRYSTAL DISPLAY

• US 20060243948A1
• Filed: 03/23/2006
• Published: 11/02/2006
• Est. Priority Date: 03/25/2005
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Eiraku, Takayuki, Ishiwa, Masaru
• Application Number:
  US11/277,263
• Publication Number:
  US 20060243948A1
• Time in Patent Office: Days
• US Class Current: 252/299.610
• 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
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133314 Back frames
• CPC Class Codes: G02F 1/133317 Intermediate frames, e.g. between backlight housing and front frame
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: H05K 7/20972 Forced ventilation, e.g. on heat dissipaters coupled to components

Abstract

The invention relates to a liquid crystal display used as a display unit of an electronic apparatus and provides a small liquid crystal display having a thin picture frame, the display having an excellent cooling function, high luminance, and high color reproducibility. The liquid crystal display includes a rear frame having an upstanding portion formed by bending an end of a longer side thereof and a heat sink which is in thermal contact with the rear frame. Thus, heat generated at LEDs can be efficiently radiated. The liquid crystal display also includes a liquid crystal display panel driving circuit which is divided into a data substrate and a control substrate. The liquid crystal display can be provided in a compact structure having a thin picture frame by disposing the data substrate on a side surface of the liquid crystal display and disposing the control substrate on the side of the heat sink.

Claims

1. A liquid crystal display comprising:

a frame member including a rear frame having an upstanding portion at least in a part of the periphery thereof and a front frame provided opposite to the rear frame;

a liquid crystal display panel provided by sealing a liquid crystal between substrates provided opposite to each other;

a light source provided at the upstanding portion;

a light guide body for guiding light from the light source to the liquid crystal display panel;

a reflective sheet for effectively utilizing light exiting the light guide body;

a diffusing member for controlling the exiting direction of the exiting light;

an optical sheet;

a cosmetic cover cooperating with the frame member to hold and accommodate the liquid crystal display panel, the light source, the light guide body, the reflective sheet, the diffusing member, and the optical sheet;

a liquid crystal display panel driving circuit for driving the liquid crystal display panel; and

a light source driving power supply for supplying power to the light source to driving the same.

2. A liquid crystal display according to claim 1, wherein the reflective sheet, the light guide body, the diffusing member, the optical sheet, and the liquid crystal display panel are disposed on a top surface of the rear frame.

3. A liquid crystal display according to claim 1, wherein the reflective sheet and the light guide body are sandwiched by the rear frame and the front frame.

4. A liquid crystal display according to claim 1, wherein a space is provided on a side of a light exit surface of the light guide body and wherein the diffusing member, the optical sheet, and the liquid crystal display panel are disposed on the side of the light exit surface, the space being interposed between the elements and the surface.

5. A liquid crystal display according to claim 1, wherein the liquid crystal display panel driving circuit and the light source driving power supply are disposed on the rear frame.

6. A liquid crystal display according to claim 1, wherein the rear frame is formed from a material having high thermal conductivity.

7. A liquid crystal display according to claim 6, wherein the rear frame is formed from an aluminum material.

8. A liquid crystal display according to claim 1, wherein the upstanding portion has a recess and wherein a light source module having the light source mounted thereon is disposed in a part of the recess.

9. A liquid crystal display according to claim 8, wherein the recess allows the light source and the light guide body to be located.

10. A liquid crystal display according to claim 1, further comprising a heat sink disposed on the rear frame.

11. A liquid crystal display according to claim 10, wherein the liquid crystal display panel driving circuit is mounted in a location where a radiation fin of the heat sink is not formed.

12. A liquid crystal display according to claim 10, wherein the heat sink has a screw hole for securing and wherein the screw hole is a mounting hole for mounting to an external apparatus.

13. A liquid crystal display according to claim 10, wherein a light source wiring connected to the light source driving power supply is disposed between the heat sink and the rear frame, extended to an end of the rear frame where the light source is not provided, and connected to the light source.

14. A liquid crystal display according to claim 10, wherein the heat sink is an integral unit.

15. A liquid crystal display according to claim 13, wherein the rear frame has a protective protrusion for protecting a connector and the light source wiring provided at a part where the light source wiring is let out.

16. A liquid crystal display according to claim 1, wherein the rear frame has a securing element provided in the vicinity of the mounting position of the light source to allow the frame to be secured to a frame portion of an external apparatus.

17. A liquid crystal display according to claim 16, wherein the securing element is a screw hole.

18. A liquid crystal display according to claim 1, wherein the liquid crystal display panel driving circuit includes a data substrate on which a drive IC for driving the liquid crystal display panel is mounted and a control substrate on which a control circuit is mounted and which is separated from the data substrate.

19. A liquid crystal display according to claim 1, comprising a L-shaped member which cooperates with the front frame to sandwich the diffusing member and the optical sheet.

20. A liquid crystal display according to claim 19, wherein the L-shaped member can be press-fit into the front frame.

21. A liquid crystal display according to claim 19, wherein the L-shaped member has a stepped portion and wherein a rubber spacer is applied to the stepped portion.

22. A liquid crystal display according to claim 19, wherein the L-shaped member is formed by bending a sheet metal.

23. A liquid crystal display according to claim 1, comprising an optical sensor for detecting light from the light source.

24. A liquid crystal display according to claim 23, wherein the optical sensor is disposed substantially in the middle of the rear frame.

25. A liquid crystal display according to claim 23, wherein optical sensor is mounted on the light source driving power supply.

26. A liquid crystal display according to claim 25, wherein the light source driving power supply includes a securing element for securing itself to the rear frame in the vicinity of the mounting position of the optical sensor.

27. A liquid crystal display according to claim 1, wherein the light source driving power supply is provided substantially in the middle of the rear frame.

28. A liquid crystal display according to claim 1, wherein the light source driving power supply is provided in the vicinity of the periphery of the rear frame.

29. A liquid crystal display according to claim 1, comprising a couple of the light source driving power supplies, wherein the light source driving power supplies are provided in the neighborhoods of opposite ends of the rear frame, respectively.