Duncan M Anderson

US Patent:

6583938, Jun 24, 2003

Filed:

Sep 29, 2000

Appl. No.:

09/675793

Inventors:

Graham John Woodgate - Oxfordshire, GB
Duncan James Anderson - Tarrytown NY
Jason Slack - Oxford, GB
Marina Vladimirovna Khazova - Oxfordshire, GB

Assignee:

Sharp Kabushiki Kaisha - Osaka

International Classification:

G02B 2710

US Classification:

359625, 359627

Abstract:

An optical device which is suitable for use in a projection display comprises a spatial light modulator, such as a liquid crystal device, with a microlens array disposed on its front surface. The microlenses are of convergent type, such as lenticules. The spatial light modulator is of the reflective type and comprises a plurality of rear reflectors, each of which has convergent optical power in at least one direction. The reflectors are arranged such that, for a given direction of illumination, each reflector forms an image of the aperture A of a microlens on the aperture B of another microlens or at a different position on the same microlens. When used in, for example, a projection display, light losses caused by vignetting are reduced.

US Patent:

6595648, Jul 22, 2003

Filed:

Mar 30, 2001

Appl. No.:

09/701397

Inventors:

Graham John Woodgate - Oxfordshire, GB
Marina Khazova - Oxfordshire, GB
Duncan James Anderson - Tarrytown NY

Assignee:

Sharp Kabushiki Kaisha - Osaka

International Classification:

G03B 2114

US Classification:

353122, 353 98, 359 15, 359 16

Abstract:

A projection display comprising: a transmissive spatial light modulator ( ); an illuminator ( ) for illuminating the modulator from the front thereof; and a hologram ( ) disposed at the rear of the modulator for imaging and reflecting back through the modulator light from the illuminator received through the modulator.

US Patent:

6686975, Feb 3, 2004

Filed:

May 10, 2001

Appl. No.:

09/852871

Inventors:

Duncan J. Anderson - Briarcliff Manor NY
Khalid Shahzad - Briarcliff Manor NY

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

G02F 11335

US Classification:

349 5, 349117, 349119, 349121

Abstract:

An apparatus for improved contrast in projection optical systems consists of a polarizing beam splitter (PBS) in combination with two or more waveplates whose fast exes are aligned perpendicular to each other. The apparatus has an effective broadband frequency response that is better than that of the individual retarders acting alone, and through the selection of a birefringence factor and thickness of the individual retarders, wavelength dependencies are minimized.

US Patent:

6698894, Mar 2, 2004

Filed:

Dec 19, 2001

Appl. No.:

10/024764

Inventors:

Duncan J Anderson - Sleepy Hollow NY

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

G03B 2100

US Classification:

353 31, 353 20, 353 81

Abstract:

A light engine for a single-panel scrolling-color projection system includes a source filter for filtering out unwanted components from the output spectrum of the source lamp prior to scrolling, and beam splitting filters having filtering characteristics chosen to mask the beamsteering effects caused by the angle sensitivity of the recombination filters. Such a light engine produces color stripes which maintain stable colors during scrolling, without the use of splitting and recombining filters with low angle sensitivities.

US Patent:

7406227, Jul 29, 2008

Filed:

Dec 5, 2003

Appl. No.:

10/545714

Inventors:

Duncan J. Anderson - Sleepy Hollow NY, US

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

G02B 6/26

US Classification:

385 39, 385 52

Abstract:

Method and apparatus of coupling light into a light guide using error detecting and correcting systems. A rectangular light guide is mated with an X-axis optical fiber and with a Y-axis optical fiber. An X-axis photodetector senses light that couples from the light guide into the X-axis optical fiber, while a Y-axis photodetector senses light that couples from the light guide into the Y-axis optical fiber. An error detector compares the outputs of the X-axis and the Y-axis photodetectors to produces error signals that depend on the X-axis, the Y-axis, and the Z-axis positional errors. The errors signals are applied to an error correcting system that adjusts the relative position of the light guide and the light directed onto the light guide.

US Patent:

7631991, Dec 15, 2009

Filed:

Sep 22, 2005

Appl. No.:

11/575702

Inventors:

Duncan J. Anderson - Sleepy Hollow NY, US
Hans Zou - Windsor NJ, US

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

F21V 5/00

US Classification:

362326, 362308, 362293, 257 98

Abstract:

Light that is emitted from an LED chip at a first angle of incidence or less relative to the LED chip is permitted to leave the LED package. Light emitted from the LED chip at an angle of incidence greater than that is kept from leaving the LED package and is recycled back within the LED package. The recycled light is reemitted from the LED package after its angle of incidence relative to the LED chip has been changed, for example by passing it through a diffuser.