Surface light source device using light emitting diodes

• US 20080080165A1
• Filed: 09/06/2007
• Published: 04/03/2008
• Est. Priority Date: 10/02/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Kim, Yong, Lee, Min, Lee, Dong
• Granted Patent: US 7,654,681 B2
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: C09K 11/7737 Phosphates
• CPC Class Codes: C09K 11/7794 Vanadates; Chromates; Molybdates; Tungstates
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 5/20 Filters polarising elements G02B5/30

Abstract

A surface light source device using light emitting diodes, the device including: a housing having a top opening to emit light; a light emitting diode board disposed on an inner bottom surface of the housing, the board on which a plurality of light emitting diodes are arranged; and a color conversion laminate formed by depositing a plurality of phosphor-mixed resin layers containing phosphors, the layers disposed at a top of the opening of the housing and providing light having different wavelengths.

Claims

1. A surface light source device using light emitting diodes, the device comprising:

a housing having a top opening to emit light;

a light emitting diode board disposed on an inner bottom surface of the housing, the board on which a plurality of light emitting diodes are arranged; and

a color conversion laminate formed by depositing a plurality of phosphor-mixed resin layers containing phosphors, the layers disposed at a top of the opening of the housing and providing light having different wavelengths.

2. The device of claim 1, wherein the plurality of phosphor-mixed resin layers are deposited in such a way that a phosphor-mixed resin layer providing a relatively lower wavelength is disposed adjacent to the plurality of light emitting diodes.

3. The device of claim 1, wherein the plurality of light emitting diodes is one of an ultraviolet light emitting diode and a near ultraviolet light emitting diode.

4. The device of claim 3, wherein the plurality of phosphor-mixed resin layers comprises a phosphor-mixed resin layer containing a blue emitting phosphor, a phosphor-mixed resin layer containing a green emitting phosphor, and a phosphor-mixed resin layer containing a red emitting phosphor.

5. The device of claim 4, wherein the color conversion laminate is formed by sequentially depositing the phosphor-mixed resin layer containing a blue emitting phosphor, the phosphor-mixed resin layer containing a green emitting phosphor, and the phosphor-mixed resin layer containing a red emitting phosphor, from a location adjacent to the plurality of light emitting diodes.

6. The device of claim 1, wherein the plurality of phosphor-mixed resin layers are formed by mixing phosphor powders providing light having different wavelengths, respectively, with one of an epoxy-based resin and a silicone-based resin.

7. The device of claim 1, wherein the housing comprises an inner surface formed of a reflective surface.