LIGHT SOURCE MODULE

• US 20110286241A1
• Filed: 10/13/2010
• Published: 11/24/2011
• Est. Priority Date: 05/18/2010
• Status: Active Grant

• Current Assignee: Coretronic Corporation
• Original Assignee: Young Lighting Technology Corporation
• Inventors: Pan, Bo-Chih, Chang, Hsi-Sheng, Liang, Yu-Wei, Cho, Fan-Ti
• Granted Patent: US 8,480,287 B2
• Time in Patent Office: Days
• US Class Current: 362/607
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• 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
• CPC Class Codes: G02B 6/009 of the light source in the package G02B6/0021 takes precedence
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

A light source module including a back frame, a light guide plate (LGP), and at least one light emitting device is provided. The back frame has a baseboard. The LGP is disposed on the back frame, and has a first surface, a second surface opposite to the first surface, and a light incident surface, wherein the second surface faces toward the baseboard. The light emitting device is disposed beside the light incident surface. The light source module further includes a thermal insulating element, which is disposed between the baseboard and the second surface, and is located adjacent to the light incident surface.

Claims

1. A light source module, comprising:

a back frame, having a baseboard;

a light guide plate, disposed on the back frame, and having a first surface, a second surface opposite to the first surface, and a light incident surface connected to the first surface and the second surface, wherein the second surface faces toward the baseboard; and

at least one light emitting device, disposed beside the light incident surface;

wherein the light source module further comprises a thermal insulating element, disposed between the baseboard and the second surface, and located adjacent to the light incident surface.

2. The light source module as claimed in claim 1, wherein the thermal insulating element is disposed on the baseboard and extends from a place adjacent to the light guide plate toward a place adjacent to the light emitting device.

3. The light source module as claimed in claim 1, wherein the back frame further comprises a sideboard, wherein the sideboard is connected to the baseboard, the light incident surface faces toward the sideboard, and the light emitting device is disposed on the sideboard.

4. The light source module as claimed in claim 1, further comprising a reflection unit, wherein the reflection unit is disposed on the thermal insulating element, and the thermal insulating element is located between the reflection unit and the baseboard.

5. The light source module as claimed in claim 4, further comprising a reflector disposed between the second surface and the baseboard, wherein one end of the reflector adjacent to the light incident surface is located between the second surface and one end of the reflection unit.

6. The light source module as claimed in claim 4, wherein the reflection unit is a silver reflector.

7. The light source module as claimed in claim 5, wherein the reflector and the reflection unit are partially overlapped.

8. The light source module as claimed in claim 5, wherein the reflector and the reflection unit are separated and are not overlapped.

9. The light source module as claimed in claim 8, wherein the reflector and the reflection unit are separated and are not overlapped in a direction substantially perpendicular to the second surface, and the reflector and the reflection unit are horizontally arranged along a direction substantially parallel to the second surface.

10. The light source module as claimed in claim 1, further comprising:

a front frame, covering the light emitting device, wherein the light emitting device is located between the front frame and the baseboard; and

a reflection unit, disposed on the front frame, and located between the front frame and the thermal insulating element.

11. The light source module as claimed in claim 1, further comprising a reflector disposed between the second surface and the baseboard.

12. The light source module as claimed in claim 1, wherein the light emitting device is a light emitting diode.

13. The light source module as claimed in claim 12, the light emitting diode is a top emitting type light emitting diode.

14. The light source module as claimed in claim 13, wherein the top emitting type light emitting diode comprises:

a light emitting diode chip; and

a spherical lens, covering the light emitting diode chip.

15. The light source module as claimed in claim 14, wherein a distance between the light emitting device and the light incident surface is substantially within a range of greater than or equal to 6 millimeters and less than or equal to 7 millimeters.

16. The light source module as claimed in claim 13, wherein the top emitting type light emitting diode comprises:

a light emitting diode chip; and

an aspheric lens, covering the light emitting diode chip.

17. The light source module as claimed in claim 1, wherein the thermal insulating element comprises:

a plurality of T-shaped hooks, disposed on a surface of the thermal insulating element facing the baseboard, and comprising a neck portion and a hook head connected to the neck portion; and

a plurality of stop blocks, disposed on one end of the thermal insulating element located between the baseboard and the second surface, wherein the stop block is bended toward a direction apart from the second surface, and

the baseboard comprises;

a plurality of T-shaped through holes, and each of the T-shaped through hole comprising;

a wide hole, wherein a width of the wide hole is capable of letting the hook head of the T-shaped hook pass through; and

a narrow hole, connected to one side of the wide hole, wherein a width of the narrow hole is smaller than the width of the wide hole, the neck portion passes through the narrow hole, a width of the hook head is greater than the width of the narrow hole, and the hook head hooks an edge of the narrow hole; and

a plurality of through holes, wherein the stop blocks are respectively leaned against sidewalls of the through holes.

18. The light source module as claimed in claim 1, wherein the thermal insulating element has at least one protrusion spacing part, and the protrusion spacing part is disposed on a surface of the thermal insulating element opposite to the baseboard, and is located at one end of the thermal insulating element, wherein the protrusion spacing part spaces one side of the thermal insulating element opposite to the baseboard into a first containing space, a second containing space, and a third containing space, and the light source module further comprises:

at least one electric connector, electrically connected to the light emitting device, and disposed in the first containing space; and

at least one securing member, disposed in the second containing space, for securing the thermal insulating element onto the baseboard,

wherein the light guide plate has at least one recessed corner, located at a corner of the light guide plate and disposed in the third containing space, wherein the recessed corner leans against one side of the protrusion spacing part.

19. The light source module as claimed in claim 1, wherein a heat conduction coefficient of the thermal insulating element is substantially smaller than 1 W/mK.

20. The light source module as claimed in claim 1, wherein a heat conduction coefficient of the thermal insulating element is smaller than a heat conduction coefficient of the back frame.

21. The light source module as claimed in claim 20, wherein a material of the thermal insulating element is plastic, and a material of the back frame is metal.