Light emitting device

• US 9,664,340 B2
• Filed: 06/10/2014
• Issued: 05/30/2017
• Est. Priority Date: 06/11/2013
• Status: Active Grant

• Current Assignee: Epistar Corporation
• Original Assignee: Epistar Corporation
• Inventors: Hsieh, Min-Hsun, Liaw, Been-Yu, Yao, Chiu-Lin, Hu, Wei-Chiang, Lai, Po-Hung, Liao, Shih-An, Liu, Chun-Hung, Hsu, Ming-Chi, Sung, Yu-His
• Primary Examiner(s): Sawhney, Hargobind S
• Application Number:
  US14/301,060
• Publication Number:
  US 20140362565A1
• Time in Patent Office: 1,085 Days
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/235 Details of bases or caps, i.e. the parts that connect the light source to a fitting; Arrangement of components within bases or caps F21K9/238 takes precedence
• CPC Class Codes: F21Y 2107/10 on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• 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 2924/00014 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 33/54 having a particular shape
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

This disclosure discloses a light-emitting device. The light-emitting device comprises: a first electrode part; a second electrode part; a third electrode part, spaced apart from the first electrode part and the second electrode part; and a light-emitting unit partially covering the first electrode part and the second electrode part and fully covering the second electrode part, the light-emitting unit having a conductive structure contacting the second electrode part.

Claims

1. A light-emitting device, comprising:

a carrier having a top surface and a bottom surface;

a first electrode having a first part formed on the top surface, and a second part formed on the bottom surface;

a second electrode having a third part formed on the top surface, wherein the first part and the third part are arranged at two opposite sides of the carrier;

a first light-emitting unit disposed on the top surface and electrically connected to the first electrode; and

a transparent body covering the first part, the second part, the third part and the first light-emitting unit.

2. The light-emitting device of claim 1, wherein the first part overlaps the second part.

3. The light-emitting device of claim 1, wherein the carrier comprises a transparent material or a non-transparent material.

4. The light-emitting device of claim 1, wherein the carrier has a side surface and the first part extends beyond the side surface.

5. The light-emitting device of claim 1, wherein the first part and the third part are electrically separated from each other when the first light-emitting unit is not disposed on the top surface.

6. The light-emitting device of claim 1, wherein the second electrode has a fourth part formed on the bottom surface and electrically connected to the third part.

7. The light-emitting device of claim 6, wherein the transparent body covers the third part and fourth part.

8. The light-emitting device of claim 1, further comprising a connector electrically and physically connected to the first part and the second part.

9. The light-emitting device of claim 8, wherein the connector covers a side surface of the carrier.

10. The light-emitting device of claim 8, wherein the connector is shorter than the first part.

11. The light-emitting device of claim 1, further comprising a second light-emitting unit, wherein the second light-emitting unit and the first electrode are arranged on opposite sides of the first light-emitting unit.

12. The light-emitting device of claim 1, wherein the carrier is made of a flexible material.

13. The light-emitting device of claim 1, wherein the first light-emitting unit comprises a plurality of connecting pads, the plurality of connecting pads is formed on a same side of the first light-emitting unit.

14. The light-emitting device of claim 1, wherein the first electrode fully covers an end portion of the carrier in a top view.

15. The light-emitting device of claim 1, wherein the transparent body comprises a wavelength conversion layer.

16. The light-emitting device of claim 1, wherein the carrier has a side surface devoid of the transparent body.

17. The light-emitting device of claim 1, wherein when the light-emitting device emits light, the light has a first average correlated color temperature over the top surface and a second average correlated color temperature below the bottom surface, the first average correlated color temperature is larger than the second average correlated color temperature.

18. The light-emitting device of claim 17, wherein the first average correlated color temperature and the second average correlated color temperature have a difference of not smaller than 50K and not greater than 300K.

19. A light-emitting device, comprising:

a carrier having a top surface and a bottom surface;

a first electrode having a first part formed on the top surface and a second part formed on the bottom surface;

a second electrode having a third part formed on the top surface, wherein the first part and the third part are arranged at two opposite sides of the carrier;

a plurality of light-emitting units disposed on the top surface and electrically connected to the first electrode; and

a wavelength conversion layer covering the first part, the second part, the third part and the plurality of light-emitting units.

20. The light-emitting device of claim of 19, further comprising a connector electrically and physically connected to the first part and the second part.