White light source from light emitting diode

• US 6,841,934 B2
• Filed: 02/26/2003
• Issued: 01/11/2005
• Est. Priority Date: 02/26/2003
• Status: Expired due to Term

• Current Assignee: Harvatek Corporation
• Original Assignee: Harvatek Corporation
• Inventors: Lee, Yann, Wang, Bily, Chuang, Jonnie
• Primary Examiner(s): Patel, Vip
• Application Number:
  US10/372,848
• Publication Number:
  US 20040164675A1
• Time in Patent Office: 685 Days
• Field of Search: 313/498, 313/501, 313/506, 313/508, 313/509, 313/512
• US Class Current: 313/512
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• 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 33/505 characterised by the shape, e.g. plate or foil
• 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
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity

Abstract

A white light source is obtained by converting short wavelength color light emitted from a light emitting diode (LED). The conversion is achieved by covering the LED chip with a fluorescent glue. The LED chip is mounted on a split substrate, and the outer ends of the substrate serve as terminals for the LED. A wall may be erected around the LED chip to contain the fluorescent glue, and another transparent glue may be used to cover the fluorescent glue for protection.

Claims

1. A light emitting diode (LED) white light source, comprising:

a light emitting diode chip having a bottom electrode and a second electrode, and emitting short wavelength color light;

a split metal substrate having a first metal section and a second metal section, separate from each other, wherein said first metal section is mounted with said bottom electrode and said second section is connected to said second electrode;

a fluorescent glue, covering said LED chip and inner ends of said first section and said second section, and converting said short wavelength color light into white light, and

terminals for said LED formed by the outer ends of said first metal section and said second metal section, not covered by said fluorescent glue.

2. The LED white light source as described in claim 1, further comprising at least one through holes in said first metal section and said second metal section for said fluorescent glue to fill and to strengthen the adhesion between the fluorescent glue and said substrate.

3. The LED white light source as described in claim 1,further comprising a wall erected around said fluorescent glue to contain said fluorescent glue.

4. The LED white light source as described in claim 3, wherein said wherein said wall is of unequal height as said fluorescent glue.

5. The LED white light source as described in claim 4, further comprising a transparent glue covering said fluorescent glue to protect said fluorescent glue.

6. The LED white light source as described in claim 5, wherein the transparent glue also covers the outside of said wall.

7. The LED white light source as described in claim 1, wherein said LED is selected from the group consisting of short wavelength blue light, purple light, blue-purple light, and ultraviolet light.

8. The LED white light source as described in claim 1, wherein said second electrode is a top electrode wire bonded to said second metal section.

9. The LED white light source as described in claim 1, wherein said second electrode is a second bottom electrode in contact with said second metal section.