Mark D Pugh

US Patent:

7580023, Aug 25, 2009

Filed:

Dec 19, 2005

Appl. No.:

11/312679

Inventors:

Mark Pugh - Los Gatos CA, US
Gerard Harbers - Sunnyvale CA, US
Serge Joël Bierhuizen - Milpitas CA, US

Assignee:

Philips Lumileds Lighting Co., LLC - San Jose CA

International Classification:

G09G 3/36

US Classification:

345102, 345 87, 345 88

Abstract:

In an LCD, a backlight having red, green, and blue LEDs is controlled to generate monochromatic light (e,g. , blue) during a portion of a cycle, such as an image frame cycle. During another portion of the cycle, all the LEDs are illuminated to create white light. The color filter in the LCD panel contains, for each white pixel, a first color (e. g. , red) subpixel filter, a second color (e. g. , green) subpixel filter, and a clear subpixel area for passing white light and the monochromatic. The liquid crystal layer shutters are controlled to pass from 0-100% of the light for their associated subpixels to create a color image. With proper control of the shutters, any desired color of each white pixel can be achieved during the cycle. By converting one color filter to a clear area, the transmission efficiency of the display is greatly increased.

US Patent:

7626210, Dec 1, 2009

Filed:

Jun 9, 2006

Appl. No.:

11/423419

Inventors:

Oleg Borisovich Shchekin - San Francisco CA, US
Mark Pugh - Los Gatos CA, US
Gerard Harbers - Sunnyvale CA, US
Michael R. Krames - Los Altos CA, US
John E. Epler - Milpitas CA, US

Assignee:

Philips Lumileds Lighting Company, LLC - San Jose CA

International Classification:

H01L 29/20

US Classification:

257 98, 257E31127, 385 4, 362610, 362612

Abstract:

Low profile, side-emitting LEDs are described, where all light is efficiently emitted within a relatively narrow angle generally parallel to the surface of the light-generating active layer. The LEDs enable the creation of very thin backlights for backlighting an LCD. In one embodiment, the LED is a flip chip with the n and p electrodes on the same side of the LED, and the LED is mounted electrode-side down on a submount. A reflector is provided on the top surface of the LED so that light impinging on the reflector is reflected back toward the active layer and eventually exits through a side surface of the LED. A waveguide layer and/or one or more phosphors layers are deposed between the semiconductor layers and the reflector for increasing the side emission area for increased efficiency. Side-emitting LEDs with a thickness of between 0. 2-0. 4 mm can be created.

US Patent:

7682850, Mar 23, 2010

Filed:

Mar 17, 2006

Appl. No.:

11/378812

Inventors:

Gerard Harbers - Sunnyvale CA, US
Serge Bierhuizen - Milpitas CA, US
Mark Pugh - Los Gatos CA, US

Assignee:

Philips Lumileds Lighting Company, LLC - San Jose CA

International Classification:

H01L 21/00

US Classification:

438 25, 438 26, 438 29, 257 98

Abstract:

A white light LED for use in backlighting or otherwise illuminating an LCD is described where the white light LED comprises a blue LED over which is affixed a preformed red phosphor platelet and a preformed green phosphor platelet. In one embodiment, to form a platelet, a controlled amount of phosphor powder is placed in a mold and heated under pressure to sinter the grains together. The platelet can be made very smooth on all surfaces. A UV LED may also be used in conjunction with red, green, and blue phosphor plates. The LED dies vary in color and brightness and are binned in accordance with their light output characteristics. Phosphor plates with different characteristics are matched to the binned LEDs to create white light LEDs with a consistent white point for use in backlights for liquid crystal displays.

US Patent:

7891852, Feb 22, 2011

Filed:

Oct 17, 2005

Appl. No.:

11/252421

Inventors:

Mark Pugh - Los Gatos CA, US
Gerard Harbers - Sunnyvale CA, US

Assignee:

Koninklijke Philips Electronics NV - Eindhoven
Philips Lumileds Lighting Company, LLC - San Jose CA

International Classification:

F21V 7/04

US Classification:

362606, 362607, 362612, 362616, 362617, 362629

Abstract:

The invention provides an illumination system and a method for illumination. The illumination system includes one or more light sources that produce a primary light, a light-mixing zone that homogenizes the primary light, a wavelength-converting layer that converts the primary light to a secondary light, and a light-transmitting zone that receives the secondary light and transmits the secondary light to, for example, a Liquid Crystal Display (LCD).

US Patent:

7942540, May 17, 2011

Filed:

Aug 7, 2009

Appl. No.:

12/538003

Inventors:

Gerard Harbers - Sunnyvale CA, US
Mark A. Pugh - Los Gatos CA, US
Menne T. de Roos - Saratoga CA, US
Peter K. Tseng - San Jose CA, US

Assignee:

Xicato, Inc. - San Jose CA

International Classification:

F21V 9/16

US Classification:

362 84, 36224902, 362247, 362281

Abstract:

A lighting module includes a light output window, at least one side wall that defines a cavity and a mounting plate, and at least one light source, and at least one reflector that is within the cavity. The light output window may be one of the side walls in a side-emitting configuration. The spectral distribution of the light coming out of the light output window may be changed by manipulating the relative position of the side wall to the at least one reflector that is within the cavity.

US Patent:

7942556, May 17, 2011

Filed:

Jan 16, 2008

Appl. No.:

12/015474

Inventors:

Gerard Harbers - Sunnyvale CA, US
Mark A. Pugh - Los Gatos CA, US

Assignee:

Xicato, Inc. - San Jose CA

International Classification:

F21V 29/00

US Classification:

362294, 362373, 362800, 362 84, 362230, 362231

Abstract:

A solid state illumination device includes a semiconductor light emitter mounted on a base and surrounded by sidewalls, e. g. , in a circular, elliptical, triangular, rectangular or other appropriate arrangement, to define a chamber. A top element, which may be reflective, may be coupled to the sidewalls to further define the chamber. The light produced by the semiconductor light emitter is emitted through the sidewalls of the chamber. The sidewalls and/or top element may include wavelength converting material, for example, as a plurality of dots on the surfaces. An adjustable wavelength converting element may be used within the chamber, with the adjustable wavelength converting element being configured to adjust the surface area that is exposed to the light emitted by the semiconductor light emitter in the chamber to alter an optical property of the chamber.

US Patent:

7984999, Jul 26, 2011

Filed:

Oct 10, 2008

Appl. No.:

12/249892

Inventors:

Gerard Harbers - Sunnyvale CA, US
Mark A. Pugh - Los Gatos CA, US
Menne T. de Roos - Saratoga CA, US
John S. Yriberri - San Jose CA, US
Peter K. Tseng - San Jose CA, US

Assignee:

Xicato, Inc. - San Jose CA

International Classification:

F21V 9/00

US Classification:

362231, 362 84, 362174

Abstract:

A light emitting device is produced using one or more light emitting diodes within a light mixing cavity formed by surrounding sidewalls. The light emitting device includes a light adjustment member that is movable to alter the shape or color of the light produced by the light emitting device. For example, the light adjustment member may alter the exposure of the wavelength converting area to the light emitted that is emitted by the light emitting diode in the light mixing cavity. Alternatively, the height of a lens may be adjusted to change the width of the beam produced. Alternatively, a movable substrate with areas of different wavelength converting materials may adjustably cover the output port of the light mixing cavity to alter the color point of the light produced.

US Patent:

7375379, May 20, 2008

Filed:

Dec 19, 2005

Appl. No.:

11/313120

Inventors:

Mark Pugh - Los Gatos CA, US
Gerard Harbers - Sunnyvale CA, US
Robert Scott West - Morgan Hill CA, US

Assignee:

Philips Limileds Lighting Company, LLC - San Jose CA

International Classification:

H01L 27/15
F21V 7/04

US Classification:

257 79, 257 59, 257 98, 362608

Abstract:

The invention provides a light-emitting device and a method of illumination. The light-emitting device includes one or more semiconductor layers, a reflective bottom surface, and a top surface coupled to semiconductor layer. The semiconductor layers include an active region where a primary light is generated. The relative position of the top surface, the reflective bottom surface and the active region is adjusted to substantially transmit the primary light through the sides of the light-emitting device.