Benjamin J Lee

Address:

317 S Main St, Johnstown, OH 43031

VIN:

1HGFA16528L090540

Make:

HONDA

Model:

CIVIC

Year:

2008

US Patent:

6943950, Sep 13, 2005

Filed:

Aug 7, 2001

Appl. No.:

09/923911

Inventors:

Benjamin L. Lee - Dallas TX, US
Claude E. Tew - Dallas TX, US
Walter M. Duncan - Dallas TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G02B005/18

US Classification:

359571, 359290

Abstract:

A method for assuring a blazed condition in a DMD device used in telecommunications applications. By meeting certain conditions in the fabrication and operation of the DMD, the device can achieve a blazed condition and be very effective in switching near monochromatic spatially coherent light, thereby opening up a whole new application field for such devices. This method determines the optimal pixel pitch and mirror tilt angle for a given incident angle and wavelength of near monochromatic spatially coherent light to assure blazed operating conditions. The Fraunhofer envelope is determined by convolving the Fourier transforms of the mirror aperture and the delta function at the center of each mirror and then aligning the center of this envelope with a diffraction order to provide a blazed condition. The method of the present invention presents a formula for precisely determining the mirror pitch and tilt angle to assure that a blazed condition exists for a given incident angle and wavelength of near monochromatic spatially coherent light. Considerations for the special case, know as Littrow conditions, where the incident and the reflected light transverse the same path, are also given.

US Patent:

7167143, Jan 23, 2007

Filed:

May 30, 2003

Appl. No.:

10/449793

Inventors:

Benjamin Lowell Lee - Duncanville TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G09G 3/00

US Classification:

345 30, 345 32

Abstract:

The present application describes a system and method for determining characteristics (e. g. , exact band location, orientation and height and the spot shape and size of a single wavelength and the like) of an optical signal projected on a spatial light modulator. In an embodiment, images with sharper edges (i. e. clear boundary between ‘on’ pixels and ‘off’ pixels) on the spatial light modulator are used to obtain spectral information from a referenced broadband source. The spectral information can be used to determine the desired characteristics of optical signals projected on the spatial light modulator.

US Patent:

7171068, Jan 30, 2007

Filed:

Dec 20, 2002

Appl. No.:

10/326231

Inventors:

Terry Bartlett - Dallas TX, US
Benjamin L. Lee - Duncanville TX, US
Bryce D. Sawyers - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G02B 6/26
G02B 26/00

US Classification:

385 17, 385 18, 385 28, 385 37, 385 39, 385 40, 385 41, 385 47, 359291, 359298, 3593375, 359338

Abstract:

A method to improve an extinction ratio of an optical device, the method includes positioning at least a majority of a plurality of micro-mirrors in an off-state position. A mirror assembly includes the plurality of micro-mirrors. The method also includes selectively positioning at least one of the plurality of micro-mirrors in an on-state position. In one particular embodiment, the at least one of the plurality of micro-mirrors positioned in the on-state position operates to improve an extinction ratio of an optical device.

US Patent:

7630135, Dec 8, 2009

Filed:

Sep 12, 2005

Appl. No.:

11/224336

Inventors:

Benjamin L. Lee - Dallas TX, US
Claude E. Tew - Dallas TX, US
Walter M. Duncan - Dallas TX, US

Assignee:

Texas Instrument Incorporated - Dallas TX

International Classification:

G02B 5/18
H04J 14/02

US Classification:

359573, 359571, 398 84, 398 87

Abstract:

A method for assuring a blazed condition in a DMD device used in telecommunications applications. By meeting certain conditions in the fabrication and operation of the DMD, the device can achieve a blazed condition and be very effective in switching near monochromatic spatially coherent light, thereby opening up a whole new application field for such devices. This method determines the optimal pixel pitch and mirror tilt angle for a given incident angle and wavelength of near monochromatic spatially coherent light to assure blazed operating conditions. The Fraunhofer envelope is determined by convolving the Fourier transforms of the mirror aperture and the delta function at the center of each mirror and then aligning the center of this envelope with a diffraction order to provide a blazed condition. The method of the present invention presents a formula for precisely determining the mirror pitch and tilt angle to assure that a blazed condition exists for a given incident angle and wavelength of near monochromatic spatially coherent light. Considerations for the special case, know as Littrow conditions, where the incident and the reflected light transverse the same path, are also given.

US Patent:

7652657, Jan 26, 2010

Filed:

Dec 13, 2006

Appl. No.:

11/610394

Inventors:

Benjamin Lowell Lee - Duncanville TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G09G 3/34

US Classification:

345108, 345 30, 345 32, 345107

Abstract:

The present application describes a system and method for determining characteristics (e. g. , exact band location, orientation and height and the spot shape and size of a single wavelength and the like) of an optical signal projected on a spatial light modulator. In an embodiment, images with sharper edges (i. e. clear boundary between ‘on’ pixels and ‘off’ pixels) on the spatial light modulator are used to obtain spectral information from a referenced broadband source. The spectral information can be used to determine the desired characteristics of optical signals projected on the spatial light modulator.

US Patent:

8235532, Aug 7, 2012

Filed:

Apr 30, 2009

Appl. No.:

12/432862

Inventors:

Walter Marvin Duncan - Dallas TX, US
Benjamin Lowell Lee - Duncanville TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G03B 21/26

US Classification:

353 34, 353 30

Abstract:

A system comprises two or more light sources comprising a first light source and a second light source, each light source of the two or more light sources configured to provide light of a particular wavelength, wherein a first wavelength of a first light provided by the first light source differs from a second wavelength of a second light provided by the second light source, and wherein the first light has a first radiant energy that experiences roll-off. The system further comprises a controller configured to modulate an attribute of each light source to compensate for the roll-off, the modulation comprising modulating an attribute of the first light source, and the modulation further comprising modulating an attribute of the second light source, the modulation of the second attribute being different from the modulation of the first attribute.

US Patent:

20070223077, Sep 27, 2007

Filed:

Mar 27, 2006

Appl. No.:

11/390952

Inventors:

Benjamin Lee - Duncanville TX, US

International Classification:

G02F 1/03
G02F 1/07

US Classification:

359254000

Abstract:

A system and method for reducing or eliminating speckle when using a coherent light source is provided. A refracting device is positioned such that a major surface of the refracting device is oblique to the axis of the coherent light and such that the coherent light passes through the refracting device. Because the refracting device is oblique to the incoming coherent light, the outgoing coherent light is offset from the axis of the incoming light. The refracting device may be rotated about an axis parallel to the incoming coherent light, thereby causing the outgoing coherent light to be rotated in an approximately circular orbit centered about the axis of the incoming coherent light.

US Patent:

20070223091, Sep 27, 2007

Filed:

Mar 27, 2006

Appl. No.:

11/390950

Inventors:

Benjamin Lee - Duncanville TX, US

International Classification:

G02B 5/30

US Classification:

359494000

Abstract:

A system and method for reducing or eliminating speckle when using a coherent light source is provided. A refracting device comprising a birefringent material is positioned such that the refracting device intercepts the coherent light. The refracting device rotates thereby causing the ordinary and/or extraordinary beams to move. The human eye integrates the movement of the beams, reducing or eliminating laser speckle. The refracting device may include one or more optical devices formed of a birefringent material. Wave plates, e.g., a wave plate, may be inserted between optical devices to cause specific patterns to be generated. Multiple optical devices having a different orientation of the horizontal component of the optical axis may also be used to generate other patterns. Furthermore, the refracting device may include an optical device having multiple sections of differing horizontal components of the optical axis.