White light LED assembly

• US 7,083,302 B2
• Filed: 03/24/2004
• Issued: 08/01/2006
• Est. Priority Date: 03/24/2004
• Status: Active Grant

• Current Assignee: Transpacific IP Group Limited
• Original Assignee: J. S. Technology Co., Ltd.
• Inventors: Chen, Wen-Ho, Lin, Chia-Feng, Chang, King Chang, Huang, Hui Yen
• Primary Examiner(s): Alavi, Ali
• Assistant Examiner(s): Sawhney, Hargobind S.
• Application Number:
  US10/807,107
• Publication Number:
  US 20050212404A1
• Time in Patent Office: 860 Days
• Field of Search: 362/231, 362/612, 257/89
• US Class Current: 362/231
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white

Abstract

A white light LED assembly has at least two kinds of light-emitting units. The units can be a white light-emitting unit composed of red, green and blue LEDs, a white light-emitting unit composed of a blue and yellowish-green LEDs, a white light-emitting unit composed of a blue LED and yellow phosphor, or a white light-emitting units composed of UV LED and red, green and blue phosphors. The white light LED assembly according to the present invention has satisfactory efficiency and color rendering property as well as flexible phosphor usage.

Claims

1. A white light LED assembly comprising at least two kinds of light-emitting units selected from a group consisting of

(a) a first white light-emitting unit composed of red, green and blue LEDs;

(b) a second white light-emitting unit composed of a blue and yellowish-green LEDs;

(c) a third white light-emitting unit composed of a blue LED and yellow phosphor; and

(d) a fourth white light-emitting units composed of UV LED and red, green and blue phosphors.

2. The white light LED assembly as in claim 1, further comprising a controller to control a luminance of each LED in the white light LED assembly.

3. The white light LED assembly as in claim 2, wherein the controller has a memory unit for storing driving current data for each LED.

4. The white light LED assembly as in claim 2, wherein the controller is a controller IC.

5. The white light LED assembly as in claim 1, wherein the LEDs in the first white light-emitting unit are manufactured from InGaAlP, InGaN and Gap material.

6. The white light LED assembly as in claim 1, wherein the white light LED assembly comprises a first white light-emitting unit composed of red, green and blue LEDs, and a third white light-emitting unit composed of a blue LED and yellow phosphor.

7. The white light LED assembly as in claim 4, wherein the LEDs in the first white light-emitting unit are manufactured from InGaAlP, InGaN and Gap material.

8. The white light LED assembly as in claim 1, wherein the white light LED assembly can be applied in a lamp or LCD back light.