DEVICE FOR EMITTING VARIOUS COLORS

• US 20100264842A1
• Filed: 07/07/2010
• Published: 10/21/2010
• Est. Priority Date: 07/29/1996
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Shimizu, Yoshinori, Noguchi, Yasunobu, Moriguchi, Toshio, Sakano, Kensho
• Granted Patent: US 7,943,941 B2
• Time in Patent Office: Days
• US Class Current: 315/287
• CPC Class Codes: C09K 11/7767 Chalcogenides
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02B 6/0025 Diffusing sheet or layer; Prismatic sheet or layer
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: H01J 29/20 characterised by the luminescent material
• CPC Class Codes: H01L 2224/45015 being circular
• CPC Class Codes: H01L 2224/45124 Aluminium (Al) as principal constituent
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/45147 Copper (Cu) as principal constituent
• CPC Class Codes: H01L 2224/45169 Platinum (Pt) as principal constituent
• 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 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/48465 the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 24/45 of an individual wire connector
• 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 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/01019 : Potassium [K]
• CPC Class Codes: H01L 2924/01021 : Scandium [Sc]
• CPC Class Codes: H01L 2924/01067 : Holmium [Ho]
• CPC Class Codes: H01L 2924/01068 : Erbium [Er]
• CPC Class Codes: H01L 2924/12036 : PN diode
• CPC Class Codes: H01L 2924/12041 : LED
• CPC Class Codes: H01L 2924/12042 : LASER
• CPC Class Codes: H01L 2924/15747 : Copper [Cu] as principal constituent
• CPC Class Codes: H01L 2924/181 : Encapsulation
• CPC Class Codes: H01L 2924/20751 : larger or equal to 10 microns less than 20 microns
• CPC Class Codes: H01L 2924/20752 : larger or equal to 20 microns less than 30 microns
• CPC Class Codes: H01L 2924/20753 : larger or equal to 30 microns less than 40 microns
• CPC Class Codes: H01L 2924/20754 : larger or equal to 40 microns less than 50 microns
• CPC Class Codes: H01L 2924/3011 : Impedance
• CPC Class Codes: H01L 2924/3025 : Electromagnetic shielding
• CPC Class Codes: H01L 2933/0091 : Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/50 : Wavelength conversion elements
• CPC Class Codes: H01L 33/501 : characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/502 : Wavelength conversion materials
• CPC Class Codes: H01L 33/504 : Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/56 : Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H05B 33/14 : characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: Y02B 20/00 : Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

A device for emitting various colors by mixing light from a first light emitting diode and light from a second light emitting diode comprises, according to one embodiment: the first light emitting diode including an LED chip comprising InGaN and being capable of emitting a blue color light, and a phosphor capable of absorbing a part of the blue color light and emitting a yellow color light, the blue color light and the yellow color light being mixed to make white-color light; the second light emitting diode being capable of emitting red, green or blue color light; and a drive circuit for separately driving each of the first and second light emitting diode.

Claims

1. A device for emitting various colors by mixing light from a first light emitting diode and light from a second light emitting diode comprising:

(i) said first light emitting diode including an LED chip comprising InGaN and being capable of emitting a blue color light, and a phosphor capable of absorbing a part of the blue color light and emitting a yellow color light, the blue color light and the yellow color light being mixed to make white-color light;

(ii) said second light emitting diode being capable of emitting red, green or blue color light; and

(iii) a drive circuit for separately driving each of said first and second light emitting diode.

2. The device according to claim 1, wherein said drive circuit includes a first driver for driving said first light emitting diode and a second driver for driving said second light emitting diode.

3. The device according to claim 1, wherein said drive circuit provides pulse signals for turning on said first and/or second light emitting diode.

4. The device according to claim 1, wherein said drive circuit changes peak value of pulse signals according an input.

5. The device according to claim 1, wherein said drive circuit changes width of pulse signals according to an input.

6. The device according to claim 1, wherein said device is placed in an aluminum diecast chassis.

7. The device according to claim 1, where said device is sealed with a silicone rubber.

8. The device according to claim 1, wherein said device comprises a dispersive member for dispersing light from said first and second light emitting diode and a reflective member for reflecting light from said first and second light emitting diode.

9. The device according to claim 1, wherein said phosphor has a garnet structure and is activated with cerium.

10. The device according to claim 1, wherein said white-color light has incandescent-lamp-color.

11. A device for emitting various colors by mixing light from a first light emitting diode and light from a second light emitting diode comprising:

(i) said first light emitting diode including an LED chip comprising InGaN and being capable of emitting a blue color light, and a phosphor capable of absorbing a part of the blue color light and emitting a yellow color light,

the blue color light and the yellow color light being mixed to make white-color light;

(ii) said second light emitting diode being capable of emitting light having a different chromaticity point from the light from said first light emitting diode; and

(iii) a drive circuit for separately driving each of said first and second light emitting diode.

12. The device according to claim 11, wherein said drive circuit includes a first driver for driving said first light emitting diode and a second driver for driving said second light emitting diode.

13. The device according to claim 11, wherein said drive circuit provides pulse signals for turning on said first and/or second light emitting diode.

14. The device according to claim 11, wherein said drive circuit changes peak value of pulse signals according an input.

15. The device according to claim 11, wherein said drive circuit changes width of pulse signals according to an input.

16. The device according to claim 11, wherein said device is placed in an aluminum diecast chassis.

17. The device according to claim 11, where said device is sealed with a silicone rubber.

18. The device according to claim 11, wherein said device comprises a dispersive member for dispersing light from said first and second light emitting diode and a reflective member for reflecting light from said first and second light emitting diode.

19. The device according to claim 11, wherein said phosphor has a garnet structure and is activated with cerium.

20. The device according to claim 11, wherein said white-color light has incandescent-lamp-color.