Light emitting diode device

• US 7,061,454 B2
• Filed: 07/16/2003
• Issued: 06/13/2006
• Est. Priority Date: 07/18/2002
• Status: Active Grant

• Current Assignee: Citizen Electronics Company Limited
• Original Assignee: Citizen Electronics Company Limited
• Inventors: Tamura, Ryo, Sasuga, Masatoshi, Hirayama, Yoshihisa, Akiyama, Takashi
• Primary Examiner(s): Liang, Regina
• Assistant Examiner(s): SHERMAN, STEPHEN G
• Application Number:
  US10/619,507
• Publication Number:
  US 20040021629A1
• Time in Patent Office: 1,063 Days
• Field of Search: 345/82, 345/39, 345/40, 345/42, 345/46, 345/83
• US Class Current: 345/82
• CPC Class Codes: G02F 1/133603 with LEDs
• 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 33/50 Wavelength conversion elements

Abstract

An LED device comprises a white LED device and a red LED device. The white LED device has a substrate, a blue LED mounted on the substrate for emitting blue light, a transparent resin covering the blue LED and including phosphor particles. The phosphor particle has a quality to convert blue light to white light, if the particle contacts with the blue light. The red LED device has a substrate, a red LED mounted on the substrate for emitting red light, and a transparent resin covering the red LED device is disposed so that emitted red light mixes with the white light emitted from the white LED device.

Claims

1. An LED device comprising:

a substrate;

a blue LED mounted on the substrate for emitting blue light;

a first transparent resin covering the blue LED;

phosphor particles, each of which has a wave length converting characteristic to convert blue light emitted by the blue LED to yellow light, disposed in the first transparent resin;

a red LED mounted on the substate for emitting red light; and

a second transparent resin covering the red LED;

wherein;

the first transparent resin is constructed and arranged to discharge white light formed by mixing the blue light of the LED with yellow light produced when the blue light strikes the phosphor particles;

the second transparent resin is constructed and arranged to discharge red light; and

the first and second transparent resins are constructed and arranged such that the discharge white light and the red light are mixed in an atmosphere surrounding the first and second resins.

2. The LED device according to claim 1 wherein the phosphor particles are particles of YAG.

3. The LED device according to claim 1 wherein the phosphor particle is green phosphor.

4. The LED device according to claim 1 wherein the phosphor particle is one of phosphate, silicate and aluminate.