WHITE LED DEVICE

• US 20060067073A1
• Filed: 09/30/2004
• Published: 03/30/2006
• Est. Priority Date: 09/30/2004
• Status: Abandoned Application

• Current Assignee: Chunghwa Picture Tubes Limited
• Original Assignee: Chunghwa Picture Tubes Limited
• Inventors: Ting, Chu-Chi
• Application Number:
  US10/711,679
• Publication Number:
  US 20060067073A1
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/49113 the connectors connecting different bonding areas on the semiconductor or solid-state body to a common bonding area outside the body, e.g. converging wires
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/50 Wavelength conversion elements

Abstract

A white LED device is described, including two LED dies capable of emitting a first color light and a second color light, respectively, and a phosphor layer coated on at least one of the two LED dies. The phosphor layer is capable of emitting a third color light when stimulated by the first or second color light, and a light mixing structure is also disposed to mix the first to third color lights into uniform white light without chromatic deviation.

Claims

1. A white LED device, comprising:

a first LED die, capable of emitting a first color light;

a second LED die, capable of emitting a second color light; and

a phosphor layer disposed on at least one of the first and second LED dies, capable of emitting a third color light when stimulated by the first or second color light;

an electrode connection structure, electrically connected with electrodes of the first and second LED dies for providing electricity to the first and second LED dies; and

a light mixing structure, capable of mixing the first to third color lights to produce white light.

2. The white LED device according to claim 1, wherein the light mixing structure comprises a transparent packaging layer enclosing

the first LED die, the second LED die and the phosphor layer;

and

the first to third color lights are mixed through a lens effect of the transparent packaging layer.

3. The white LED device according to claim 2, wherein the electrode connection structure includes a packaging substrate that have pins electrically connected with the electrodes of the first and second LED dies.

4. The white LED device according to claim 3, wherein

the packaging substrate has a groove therein;

the first and second LED dies are disposed in the groove;

the transparent packaging layer fills the groove; and

the pins comprise;

a first pin extending into the groove, connected with one electrode of each of the first and second LED dies; and

a second pin, connected with the other electrode of each of the first and second LED dies through wire bonding.

5. The white LED device according to claim 4, wherein the transparent packaging layer comprises:

a transparent resin filled in the groove; and

a transparent glass layer disposed on the transparent resin.

6. The white LED device according to claim 2, wherein the electrode connection structure comprises:

a first electrode frame, connected with one electrode of each of the first and second LED dies; and

a second electrode frame, connected with the other electrode of each of the first and second LED dies.

7. The white LED device of claim 6, wherein

the first electrode frame has a groove therein;

the first and second LED dies are disposed in the groove, so that one electrode of each of the first and second LED dies is electrically connected to the first electrode frame;

the transparent packaging layer fills the groove; and

the second electrode frame connect with the other electrode of each of the first and second LED dies through wire bonding.

8. The white LED device according to claim 7, wherein the transparent packaging layer comprises:

a transparent resin filled in the groove; and

a transparent glass layer enclosing the transparent resin.

9. The white LED device according to claim 1, wherein the first LED die comprises a blue LED die, the second LED die comprises a green LED die, and the phosphor layer comprises a red phosphor.

10. The white LED device according to claim 9, wherein the phosphor layer is disposed merely on the blue LED die.

11. The white LED device according to claim 9, wherein the phosphor layer is disposed merely on the green LED die.

12. The white LED device according to claim 9, wherein the phosphor layer is disposed on each of the blue LED die and the green LED die.

13. The white LED device according to claim 9, wherein the phosphor layer includes a red phosphor selected from the group consisting of Sr₂Si₅N₈:

eu²⁺, SrS;

Eu²⁺, CaS;

Eu²⁺ and combinations thereof.