Flexible LED assemblies and LED light bulbs

• US 9,231,171 B2
• Filed: 09/08/2014
• Issued: 01/05/2016
• Est. Priority Date: 09/11/2013
• Status: Expired

• Current Assignee: Epistar Corporation, Kaistar Lighting (Xiamen) Co.,Ltd.
• Original Assignee: Huga Optotech Incorporated (Epistar Corporation), Interlight Optotech Corporation
• Inventors: Liu, Hong-Zhi, Cheng, Tzu-Chi
• Primary Examiner(s): Potter, Roy
• Assistant Examiner(s): PATTON, PAUL E
• Application Number:
  US14/480,084
• Publication Number:
  US 20150069442A1
• Time in Patent Office: 484 Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21Y 2107/70 on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form
• CPC Class Codes: F21Y 2109/00 Light sources with light-generating elements disposed on transparent or translucent supports or substrates
• 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 33/504 Elements with two or more wavelength conversion materials
• 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

LED assemblies and related LED light bulbs. An LED assembly has a flexible, transparent substrate, an LED chip on the first surface and electrically connected to two adjacent conductive sections, a first wavelength conversion layer, formed on the first surface to substantially cover the LED chip, and a second wavelength conversion layer formed on the second surface. The flexible, transparent substrate has first and second surfaces opposite to each other, and several conductive sections, which are separately formed on the first surface.

Claims

1. An LED assembly, comprising:

a flexible, transparent substrate, comprising;

first and second surfaces opposite to each other; and

several conductive sections, separately formed on the first surface;

an LED chip on the first surface and electrically connected to two adjacent conductive sections;

a first wavelength conversion layer, formed on the first surface to substantially cover the LED chip; and

a second wavelength conversion layer formed on the second surface.

2. The LED assembly as claimed in claim 1, wherein the transparent substrate is a longitudinal strip with two opposite ends, and the LED assembly comprises LED chips arranged in a first row along a longitudinal line connecting the opposite ends.

3. The LED assembly as claimed in claim 1, wherein the flexible, transparent substrate further comprises a sidewall connecting the first and second surfaces, and at least a portion of the sidewall is not covered by the first wavelength conversion layer.

4. The LED assembly as claimed in claim 1, wherein the conductive sections are transparent in view of the light emitted from the LED chip.

5. The LED assembly as claimed in claim 1, wherein at least one of the conductive sections has a portion not covered by the first wavelength conversion layer.

6. The LED assembly as claimed in claim 1, wherein the LED chip is flipped over and mounted on the first surface.

7. The LED assembly as claimed in claim 1, wherein the first wavelength conversion layer comprises a phosphor.

8. The LED assembly as claimed in claim 1, wherein the LED assembly is capable of being curved to be a tape on a reel.

9. An LED light bulb, comprising:

a base;

a lamp bulb, fixed on the base to define an inner space; and

the LED assembly claimed in claim 1, positioned inside the inner space and electrically connected to the base.

10. The LED light bulb as claimed in claim 9, wherein the LED assembly is curved to have an arc.

11. The LED light bulb as claimed in claim 9, wherein the LED light bulb has a screw axis and the LED assembly is curved to be on a plane perpendicular to the screw axis.

12. The LED light bulb as claimed in claim 11, wherein the LED assembly is curved to substantially be a circle.

13. The LED light bulb as claimed in claim 9, further comprising two conductive wires respective connected to two of the conductive sections.