LIGHT SOURCE MODULE, LIGHT SOURCE APPARATUS AND LIQUID CRYSTAL DISPLAY

• US 20080143916A1
• Filed: 07/11/2007
• Published: 06/19/2008
• Est. Priority Date: 07/21/2006
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Fukasawa, Hiroyuki, Fujino, Toyomi, Fujii, Masaru
• Granted Patent: US 7,878,680 B2
• Time in Patent Office: Days
• US Class Current: 349/58
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: H01L 2224/43 Manufacturing methods
• CPC Class Codes: H01L 2224/45 of an individual wire connector
• CPC Class Codes: H01L 2224/45099 Material
• CPC Class Codes: H01L 2224/48 of an individual wire connector
• CPC Class Codes: H01L 24/45 of an individual wire connector
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01006 Carbon [C]
• CPC Class Codes: H01L 2924/01015 Phosphorus [P]
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H05K 1/0209 External configuration of printed circuit board adapted for heat dissipation, e.g. lay-out of conductors, coatings
• CPC Class Codes: H05K 2201/09318 : Core having one signal plane and one power plane
• CPC Class Codes: H05K 2201/09681 : Mesh conductors, e.g. as a ground plane
• CPC Class Codes: H05K 2201/09781 : Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components
• CPC Class Codes: H05K 2201/10106 : Light emitting diode [LED]

Abstract

A light source module includes a light emitting diode and a wiring board. The light emitting diode (LED) chip group includes LED chips for red, green and blue colors. A plurality of the LED chip groups are mounted on the wiring board. A surface on one side of the wiring board is a device forming surface including the plurality of the LED chip groups, an external connecting terminal for leading out electrodes, and a wiring pattern for electrical connection between the LED chip groups and the external connecting terminal. A surface on the other side of the wiring board is a heat radiating surface which is thermally connected to the device forming surface and operative to radiate heat generated at the device forming surface to the exterior.

Claims

1. A light source module comprising:

a light emitting diode (LED) chip group including LED chips for red, green and blue colors; and

a wiring board on which a plurality of said LED chip groups are mounted,

wherein a surface on one side of said wiring board is a device forming surface including said plurality of said LED chip groups, an external connecting terminal for leading out electrodes, and a wiring pattern for electrical connection between said LED chip groups and said external connecting terminal; and

a surface on the other side of said wiring board is a heat radiating surface which is thermally connected to said device forming surface and operative to radiate heat generated at said device forming surface to the exterior.

2. The light source module as set forth in claim 1,

wherein each said LED chip group has said LED chips for said colors located respectively at the vertices of a triangle so that intervals between said LED chips for said colors are substantially equal.

3. The light source module as set forth in claim 1,

wherein said LED chip groups are mounted on said device forming surface so that said LED chip groups are the same in layout relationship of said LED chips for said colors.

4. The light source module as set forth in claim 1,

wherein said wiring pattern includes, laid around on said device forming surface, three wirings for connecting said plurality of said LED chip groups in series on the basis of each said color.

5. The light source module as set forth in claim 1,

wherein said wiring pattern has said wirings laid around so as not to intersect each other.

6. The light source module as set forth in claim 1,

wherein said wiring pattern has said wirings laid around in the state of being branched from an intermediate part on the basis of each said color.

7. The light source module as set forth in claim 1,

wherein said wiring pattern is so formed that the pattern width in a wiring region is narrower than said LED chip.

8. The light source module as set forth in claim 1,

wherein said wiring pattern is so formed that the pattern width in a chip mounting region is wider than said LED chip.

9. The light source module as set forth in claim 1,

wherein said external connecting terminal is disposed at the center position of arbitrary four of said LED chip groups located respectively at the four corners of a tetragon, on said device forming surface.

10. The light source module as set forth in claim 1,

wherein said external connecting terminal includes a connector mounted on said device forming surface, and a flexible substrate connected to said connector;

and

said wiring board is provided with a cutout for leading out said flexible substrate to the exterior.

11. The light source module as set forth in claim 1,

wherein said device forming surface is colored in white.

12. The light source module as set forth in claim 1,

wherein said heat radiating surface has a metal layer formed on said surface on said other side of said wiring board.

13. The light source module as set forth in claim 12,

wherein said metal layer has a pattern shape obtained by projecting, onto said heat radiating surface, said wiring pattern formed on said device forming surface of said wiring board.

14. The light source module as set forth in claim 13,

wherein said metal layer is patterned in a lattice form in a region different from the region of projection of said wiring pattern on said heat radiating surface.

15. The light source module as set forth in claim 13,

wherein a region, corresponding to a land part where each said LED chip is mounted, of said region of projection of said wiring pattern has a shape in which a positive electrode and a negative electrode are united.

16. The light source module as set forth in claim 1,

wherein six of said LED chip groups are arranged in the major edge direction of said wiring board.

17. A light source apparatus comprising

a combination of a plurality of light source modules, each said light source module including:

an LED chip group including LED chips for red, green and blue colors; and

a wiring board on which a plurality of said LED chip groups are mounted,

wherein a surface on one side of said wiring board is a device forming surface including said plurality of said LED chip groups, an external connecting terminal for leading out electrodes, and a wiring pattern for electrical connection between said LED chip groups and said external connecting terminal; and

a surface on the other side of said wiring board is a heat radiating surface which is thermally connected to said device forming surface and operative to radiate heat generated at said device forming surface to the exterior.

18. The light source apparatus as set forth in claim 17,

wherein said light source modules are integrally arranged on a metallic housing.

19. The light source apparatus as set forth in claim 18,

wherein said wiring board of each said light source module is provided in its peripheral edge part with an engaging recess to be engaged with a fixing claw provided on said metallic housing.

20. The light source apparatus as set forth in claim 18,

wherein said wiring board of each said light source module is formed in the shape of the kana letter

, the kana letter

, the kana letter

or the Chinese character

, and is supported on a common support block including a containing part having a shape corresponding to the outer shape of said wiring board.

21. The light source apparatus as set forth in claim 17,

wherein said wiring board of each said light source module is opened to the exterior on the side of said surface on said other side.

22. A liquid crystal display comprising

a liquid crystal display panel, and

a backlight unit configured to illuminate said liquid crystal display panel from the back side,

said backlight unit including a light source apparatus having a combination of a plurality of light source modules,

each said light source module including:

an LED chip group including LED chips for red, green and blue colors; and

a wiring board on which a plurality of said LED chip groups are mounted,

wherein a surface on one side of said wiring board is a device forming surface having said plurality of said LED chip groups, an external connecting terminal for leading out electrodes, and a wiring pattern for electrical connection between said LED chip groups and said external connecting terminal; and

a surface on the other side of said wiring board is a heat radiating surface which is thermally connected to said device forming surface and operative to radiate heat generated at said device forming surface to the exterior.

23. The liquid crystal display as set forth in claim 22,

wherein said backlight unit includes:

a metallic back housing containing said light source apparatus therein and opened on the side of said liquid crystal display panel; and

a support housing disposed between said back housing and said liquid crystal display panel, supporting said liquid crystal display panel and opened on the side of said liquid crystal display panel, and

the relationship of A1<

A2<

A3<

A4 is satisfied, where A1 is the size of a pixel area in said liquid crystal display panel, A2 is the aperture size of said support housing, A3 is the size of an optical cover area of said light source apparatus, and A4 is the aperture size of said back housing.