LED MODULE

• US 20150316215A1
• Filed: 11/29/2013
• Published: 11/05/2015
• Est. Priority Date: 12/03/2012
• Status: Active Grant

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Electronics Company Limited, Citizen Holdings Co., Ltd. (Citizen Electronics Company Limited)
• Inventors: Togawa, Masato
• Granted Patent: US 9,810,381 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

Provided is an LED module which, even when CSP LED devices are arrayed adjacent to each other, emits light at a light emission color of a single LED device and is bright. An LED module includes a module substrate, first LED devices having a lateral surface which is configured of an optically transmissive face, and second LED devices having a lateral surface which is configured of a light blocking face. The first LED devices are mounted upon the module substrate adjacent to the second LED devices such that the translucent faces of the first LED devices and the light blocking faces of the second LED devices are in opposition.

Claims

1. An LED module comprising:

a module substrate;

a first LED device having a side face formed as an optically transmissive face; and

a second LED device having a side face formed as a light blocking face,

wherein said first LED device and said second LED device are arranged one adjacent to the other on said module substrate in such a manner that the optically transmissive face of said first LED device and the light blocking face of said second LED device oppose each other.

2. The LED module according to claim 1, wherein of four side faces of said second LED device, only two opposed side faces are light blocking faces.

3. The LED module according to claim 2, wherein said first LED device and said second LED device are arranged in a linear array.

4. The LED module according to claim 1, wherein all four side faces of said second LED device are light blocking faces.

5. The LED module according to claim 4, wherein a plurality of said first LED devices and a plurality of said second LED devices are respectively arranged in a staggered array.

6. The LED module according to claim 1, wherein the light blocking face of said second LED device is formed from a white reflective member.

7. The LED module according to claim 6, wherein said first LED device contains a first LED die having a first electrode disposed on a side thereof that faces said module substrate, said first LED die comprises a first semiconductor layer and a first transparent insulating substrate formed one on top of the other on said first electrode, and said first LED device is constructed by covering an upper face and side face of said first LED die with a phosphor resin, and

said second LED device contains a second LED die having a second electrode disposed on a side thereof that faces said module substrate, said second LED die comprises a second semiconductor layer and a second transparent insulating substrate formed one on top of the other on said second electrode, and said second LED device is constructed by covering an upper face of said second LED die with a phosphor resin and the side face thereof with said white reflective member.

8. The LED module according to claim 7, wherein said first electrode of said first LED device and said second electrode of said second LED device are each an external connecting electrode for connecting to an electrode formed on said module substrate.

9. The LED module according to claim 8, wherein a bottom face of said first LED die contained in said first LED device is covered with said phosphor resin everywhere except where said external connecting electrode is formed.

10. The LED module according to claim 8, wherein a bottom face of said second LED die contained in said second LED device is covered with said white reflective member everywhere except where said external connecting electrode is formed.

11. The LED module according to claim 7, wherein said first LED die contained in said first LED device or said second LED die contained in said second LED device is flip-chip mounted on a submount substrate or a lead.

12. The LED module according to claim 11, wherein a side face of said submount substrate or lead is covered with said phosphor resin.

13. The LED module according to claim 7, wherein said phosphor resin used to cover the upper face of said first LED die contained in said first LED device or of said second LED die contained in said second LED device is formed in the shape of a phosphor sheet.

14. The LED module according to claim 1, wherein said first LED device and said second LED device respectively emit light of different colors.