Wayne B Snyder

US Patent:

6492725, Dec 10, 2002

Filed:

Feb 4, 2000

Appl. No.:

09/498311

Inventors:

Ban Poh Loh - San Jose CA
Douglas P. Woolverton - Mt. View CA
Wayne L. Snyder - Palo Alto CA

Assignee:

Lumileds Lighting, U.S., LLC - San Jose CA

International Classification:

H01L 2348

US Classification:

257723, 257724, 257 79, 257 99

Abstract:

A concentrically leaded power semiconductor package includes two or more generally concentric conductors. An inner conductor may provide an attachment point for one or more semiconductor devices at an end of the inner conductor and an electrical connection at an opposite end. An outer conductor may be pressed onto the inner conductor and may be separated by an electrical insulator. A semiconductor device, such as a light emitting diode (LED), may be attached to the inner conductor by epoxy gluing or by soldering, and may be attached to the outer conductor by a bonding wire. The package may be cylindrical or a rectangular solid. The package may incorporate additional semiconductor mounting surfaces and more than two conductors.

US Patent:

6756186, Jun 29, 2004

Filed:

Mar 22, 2002

Appl. No.:

10/104883

Inventors:

Wayne L. Snyder - Palo Alto CA
Daniel A. Steigerwald - Cupertino CA

Assignee:

Lumileds Lighting U.S., LLC - San Jose CA

International Classification:

H01J 9227

US Classification:

430321, 430945, 445 24

Abstract:

A method of forming a photoresist mask on a light emitting device is disclosed. A portion of the light emitting device is coated with photoresist. A portion of the photoresist is exposed by light impinging on the interface of the light emitting device and the photoresist from inside the light emitting device. The photoresist is developed, removing either the exposed photoresist or the unexposed photoresist. In one embodiment, the photoresist mask may be used to form a phosphor coating. After the photoresist is developed to remove the exposed photoresist, a phosphor layer is deposited overlying the light emitting device. The unexposed portion of photoresist is stripped. In some embodiments, the light exposing the photoresist is produced by electrically biasing the light emitting device, or by shining light into the light emitting device through an aperture or by a focussed laser.

US Patent:

6768525, Jul 27, 2004

Filed:

Dec 1, 2000

Appl. No.:

09/728883

Inventors:

Steven Paolini - Saratoga CA
Gerard Harbers - Anjervallie, NL
Wayne L. Snyder - Palo Alto CA

Assignee:

Lumileds Lighting U.S. LLC - San Jose CA

International Classification:

G02F 11335

US Classification:

349 65, 385901, 362545

Abstract:

A color, transmissive LCD is described herein which uses red, green, and blue LEDs as the light source. The R, G, and B LEDs are coupled to separate light guides, one light guide for each color. These light guides may take the form of three overlying plastic or glass sheets. In another embodiment, thin fiber optic cables arranged parallel to each other on a supporting surface are used as the light guides, and each fiber optic cable is optically coupled to only one R, G, or B LED in a repeating pattern. The light guides contain deformities to emit light coinciding with the positions of the red, green, and blue pixels. The R, G, and B LEDs are constantly on, and there is no color filtering.

US Patent:

6791636, Sep 14, 2004

Filed:

May 10, 2001

Appl. No.:

09/854014

Inventors:

Gerard Harbers - Anjervallie, NL
Wayne L. Snyder - Palo Alto CA

Assignee:

Lumilecs Lighting U.S., LLC - San Jose CA

International Classification:

G02F 11335

US Classification:

349 61, 349 65, 349 62, 349 64, 349112, 349113, 349114

Abstract:

In one embodiment, a color, transmissive LCD uses red, green, and blue LEDs as the light source. The red LED is optically coupled to a first edge of a rectangular light guide; the green LED is optically coupled to a second edge of the light guide; and the blue LED is optically coupled to a third edge of the light guide. Three sets of deformities in the light guide selectively direct the R, G, and B light out of the front surface of the light guide. The R, G, and B LEDs are constantly on and there is no color filtering. In another embodiment, a blue light LED is optically coupled to one or more edges of a light guide, and phosphor strips are placed on a surface of the light guide coinciding with the red and green pixel columns. Deformities below the red and green phosphor strips and below the blue pixel areas direct blue light to the backs of the phosphor strips and to the blue pixel areas. If an ultraviolet light LED is used, phosphor strips for the blue pixel areas would also be used.

US Patent:

7053419, May 30, 2006

Filed:

Sep 12, 2000

Appl. No.:

09/660317

Inventors:

Michael D. Camras - Sunnyvale CA, US
Michael R. Krames - Mountain View CA, US
Wayne L. Snyder - Palo Alto CA, US
Frank M. Steranka - San Jose CA, US
Robert C. Taber - Palo Alto CA, US
John J. Uebbing - Palo Alto CA, US
Douglas W. Pocius - Sunnyvale CA, US
Troy A. Trottier - San Jose CA, US
Christopher H. Lowery - Fremont CA, US
Gerd O. Mueller - San Jose CA, US

Assignee:

LumiLeds Lighting U.S., LLC - San Jose CA

International Classification:

H01L 33/00

US Classification:

257 98

Abstract:

Light emitting devices with improved light extraction efficiency are provided. The light emitting devices have a stack of layers including semiconductor layers comprising an active region. The stack is bonded to a transparent lens having a refractive index for light emitted by the active region preferably greater than about 1. 5, more preferably greater than about 1. 8. A method of bonding a transparent lens to a light emitting device having a stack of layers including semiconductor layers comprising an active region includes elevating a temperature of the lens and the stack and applying a pressure to press the lens and the stack together. Bonding a high refractive index lens to a light emitting device improves the light extraction efficiency of the light emitting device by reducing loss due to total internal reflection. Advantageously, this improvement can be achieved without the use of an encapsulant.

US Patent:

7064355, Jun 20, 2006

Filed:

Jun 12, 2001

Appl. No.:

09/880204

Inventors:

Michael D. Camras - Sunnyvale CA, US
Michael R. Krames - Mountain View CA, US
Wayne L. Snyder - Palo Alto CA, US
Frank M. Steranka - San Jose CA, US
Robert C. Taber - Palo Alto CA, US
John J. Uebbing - Palo Alto CA, US
Douglas W. Pocius - Sunnyvale CA, US
Troy A. Trottier - San Jose CA, US
Christopher H. Lowery - Fremont CA, US
Gerd O. Mueller - San Jose CA, US
Gloria E. Hofler - Sunnyvale CA, US

Assignee:

Lumileds Lighting U.S., LLC - San Jose CA

International Classification:

H01L 33/00

US Classification:

257 98, 257 99, 257 94, 257 96, 257 81, 257680, 369112

Abstract:

Light emitting devices with improved light extraction efficiency are provided. The light emitting devices have a stack of layers including semiconductor layers comprising an active region. The stack is bonded to a transparent optical element having a refractive index for light emitted by the active region preferably greater than about 1. 5, more preferably greater than about 1. 8. A method of bonding a transparent optical element (e. g. , a lens or an optical concentrator) to a light emitting device comprising an active region includes elevating a temperature of the optical element and the stack and applying a pressure to press the optical element and the light emitting device together. A block of optical element material may be bonded to the light emitting device and then shaped into an optical element. Bonding a high refractive index optical element to a light emitting device improves the light extraction efficiency of the light emitting device by reducing loss due to total internal reflection. Advantageously, this improvement can be achieved without the use of an encapsulant.

US Patent:

7279345, Oct 9, 2007

Filed:

Sep 10, 2004

Appl. No.:

10/938237

Inventors:

Michael D. Camras - Sunnyvale CA, US
Michael R. Krames - Mountain View CA, US
Wayne L. Snyder - Palo Alto CA, US
Frank M. Steranka - San Jose CA, US
Robert C. Taber - Palo Alto CA, US
John J. Uebbing - Palo Alto CA, US
Douglas W. Pocius - Sunnyvale CA, US
Troy A. Trottier - San Jose CA, US
Christopher H. Lowery - Fremont CA, US
Gerd O. Mueller - San Jose CA, US
Gloria E. Hofler - Sunnyvale CA, US

Assignee:

Philips Lumileds Lighting Company, LLC - San Jose CA

International Classification:

H01L 21/00

US Classification:

438 27, 438 29, 438 65, 257E33067

Abstract:

A method of bonding a transparent optical element to a light emitting device having a stack of layers including semiconductor layers comprising an active region is provided. The method includes elevating a temperature of the optical element and the stack and applying a pressure to press the optical element and the stack together. In one embodiment, the method also includes disposing a layer of a transparent bonding material between the stack and the optical element. The bonding method can be applied to a premade optical element or to a block of optical element material which is later formed or shaped into an optical element such as a lens or an optical concentrator.

US Patent:

8049234, Nov 1, 2011

Filed:

Oct 8, 2007

Appl. No.:

11/868903

Inventors:

Michael D. Camras - Sunnyvale CA, US
Michael R. Krames - Los Altos CA, US
Wayne L. Snyder - Palo Alto CA, US
Frank M. Steranka - San Jose CA, US
Robert C. Taber - Palo Alto CA, US
John J. Uebbing - Palo Alto CA, US
Douglas W. Pocius - Sunnyvale CA, US
Troy A. Trottier - San Jose CA, US
Christopher H. Lowery - Fremont CA, US
Gerd O. Mueller - San Jose CA, US
Gloria E. Hofler - Sunnyvale CA, US

Assignee:

Philips Lumileds Lighting Company LLC - San Jose CA

International Classification:

H01L 33/00

US Classification:

257 98, 257 99, 257100, 257102, 257103, 257E33

Abstract:

Light emitting devices with improved light extraction efficiency are provided. The light emitting devices have a stack of layers including semiconductor layers comprising an active region. The stack is bonded to a transparent optical element.