Dung Tien Duong

US Patent:

6888997, May 3, 2005

Filed:

Sep 11, 2003

Appl. No.:

10/660214

Inventors:

Dung T. Duong - Austin TX, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G02B006/10

US Classification:

385146

Abstract:

A waveguide device including a light transmitting body having a first surface, a second surface, and a longitudinal axis where at least one of the first and second surfaces, and preferably both surfaces, are configured to extent in a direction non-parallel to the longitudinal axis. The body of the waveguide can be configured in an elliptical shape along the longitudinal axis, whereby a proximal portion of the waveguide device is symmetrical with a distal portion. The waveguide device being elliptically configured can be combined with a light to form an optical transfer system.

US Patent:

7772604, Aug 10, 2010

Filed:

Jan 3, 2007

Appl. No.:

11/649018

Inventors:

Dung T. Duong - Cedar Park TX, US
Paul N. Winberg - Rollingwood TX, US
Matthew R. Thomas - Austin TX, US

Assignee:

Illumitex - Austin TX

International Classification:

H01L 33/00

US Classification:

257 95, 257 98, 257E33058

Abstract:

Embodiments of the present invention provide separate optical devices operable to couple to a separate LED, the separate optical device comprising an entrance surface to receive light from a separate LED when the separate optical device is coupled to the separate LED, an exit surface opposite from and a distance from the entrance surface and a set of sidewalls. The exit surface has at least a minimum area necessary to conserve brightness for a desired half-angle of light projected from the separate optical device. Furthermore, each sidewall is positioned and shaped so that at least a majority of rays having a straight transmission path from the entrance surface to that sidewall reflect to the exit surface with an angle of incidence at the exit surface at less than or equal to a critical angle at the exit surface.

US Patent:

7789531, Sep 7, 2010

Filed:

Oct 1, 2007

Appl. No.:

11/906194

Inventors:

Dung T. Duong - Cedar Park TX, US
Paul N. Winberg - Rollingwood TX, US
Matthew R. Thomas - Austin TX, US

Assignee:

Illumitex, Inc. - Austin TX

International Classification:

F21S 2/00

US Classification:

362257, 36229601

Abstract:

Embodiments provide an LED comprising a quantum well region operable to generate light and a substrate having an interface with the quantum well region, wherein light generated by the quantum well region traverses the interface to enter the substrate and exit the LED through an exit face of the substrate. The exit face may be opposite from and a distance from the interface, with some portion or all of this LED being shaped to optimize the light extraction efficiency of the device. The exit face can have at least 70% of a minimum area necessary to conserve brightness for a desired half-angle of light. Sidewalls of the LED may be positioned and shaped so that rays incident on a sidewall reflect to the exit face with an angle of incidence at the exit face at less than or equal to a critical angle at the exit face.

US Patent:

7829358, Nov 9, 2010

Filed:

Feb 6, 2009

Appl. No.:

12/367343

Inventors:

Dung T. Duong - Cedar Park TX, US
Paul N. Winberg - Rollingwood TX, US
Matthew R. Thomas - Austin TX, US
Elliot M. Pickering - Austin TX, US
Muhammad Khizar - Charlotte NC, US

Assignee:

Illumitex, Inc. - Austin TX

International Classification:

H01L 21/00

US Classification:

438 20, 257E2105, 257E21379, 257E21381

Abstract:

Embodiments of an LED disclosed has an emitter layer shaped to a controlled depth or height relative to a substrate of the LED to maximize the light output of the LED and to achieve a desired intensity distribution. In some embodiments, the exit face of the LED may be selected to conserve radiance. In some embodiments, shaping the entire LED, including the substrate and sidewalls, or shaping the substrate alone can extract 100% or approximately 100% of the light generated at the emitter layers from the emitter layers. In some embodiments, the total efficiency is at least 90% or above. In some embodiments, the emitter layer can be shaped by etching, mechanical shaping, or a combination of various shaping methods. In some embodiments, only a portion of the emitter layer is shaped to form the tiny emitters. The unshaped portion forms a continuous electrical connection for the LED.

US Patent:

7968896, Jun 28, 2011

Filed:

May 26, 2010

Appl. No.:

12/788094

Inventors:

Dung T. Duong - Cedar Park TX, US
Paul N. Winberg - Rollingwood TX, US
Matthew R. Thomas - Austin TX, US

Assignee:

Illumitex, Inc. - Austin TX

International Classification:

H01L 33/00

US Classification:

257 95, 257 96, 257E33058

Abstract:

Embodiments of the present invention provide separate optical devices operable to couple to a separate LED, the separate optical device comprising an entrance surface to receive light from a separate LED when the separate optical device is coupled to the separate LED, an exit surface opposite from and a distance from the entrance surface and a set of sidewalls. The exit surface can have at least a minimum area necessary to conserve brightness for a desired half-angle of light projected from the separate optical device. Furthermore, each sidewall is positioned and shaped so that rays having a straight transmission path from the entrance surface to that sidewall reflect to the exit surface with an angle of incidence at the exit surface at less than or equal to a critical angle at the exit surface.

US Patent:

8087960, Jan 3, 2012

Filed:

Oct 1, 2007

Appl. No.:

11/906219

Inventors:

Dung T. Duong - Cedar Park TX, US
Paul N. Winberg - Rollingwood TX, US
Matthew R. Thomas - Austin TX, US
Elliot M. Pickering - Austin TX, US

Assignee:

Illumitex, Inc. - Austin TX

International Classification:

F23Q 23/08

US Classification:

445 3, 257 79, 438745

Abstract:

Embodiments provide an LED comprising a quantum well region operable to generate light and a substrate having an interface with the quantum well region, wherein light generated by the quantum well region traverses the interface to enter the substrate and exit the LED through an exit face of the substrate. The exit face may be opposite from and a distance from the interface, with some portion or all of this LED being shaped to optimize the light extraction efficiency of the device. The exit face can have at least 70% of a minimum area necessary to conserve brightness for a desired half-angle of light. Sidewalls of the LED may be positioned and shaped so that rays incident on a sidewall reflect to the exit face with an angle of incidence at the exit face at less than or equal to a critical angle at the exit face.

US Patent:

8115217, Feb 14, 2012

Filed:

Dec 11, 2009

Appl. No.:

12/636280

Inventors:

Dung T. Duong - Cedar Park TX, US
Paul N. Winberg - Rollingwood TX, US
Oscar Vaz - Austin TX, US

Assignee:

Illumitex, Inc. - Austin TX

International Classification:

H01L 33/00
H01L 21/50

US Classification:

257 88, 257 98, 257E33056, 257E33061, 257E21499, 438 27, 438 28

Abstract:

Embodiments disclosed herein provide packaged LED devices in which the majority of the emitted light comes out the top of each LED chip with very little side emissions. Because light only comes out from the top, phosphor deposition and color temperature control can be significantly simplified. A package LED may include a housing positioned on a supporting submount, sized and dimensioned to accommodate a single LED chip or an array of LED chips. The LED chip(s) may be attached to the submount utilizing the Gold-to-Gold Interconnect (GGI) process or solder-based approaches. In some embodiments, phosphor may be deposited on top of the LED chip(s) or sandwiched between glass plates on top of the LED chip(s). The phosphor layer may be inside or on top of the housing and be secured to the housing utilizing an adhesive. The housing may be adhered to the submount utilizing a thermal epoxy.

US Patent:

8217399, Jul 10, 2012

Filed:

Jul 29, 2009

Appl. No.:

12/511396

Inventors:

Dung T. Duong - Cedar Park TX, US
William Gregory Flynn - Austin TX, US

Assignee:

Illumitex, Inc. - Austin TX

International Classification:

H01L 33/20

US Classification:

257 79, 438 22, 257E33005

Abstract:

Embodiments described herein include LEDs that promote photon tunneling. One embodiment of an LED device can have a quantum well layer adapted to generate light having a wavelength, a p-doped alloy layer on a first side of the quantum well layer and an n-doped alloy layer on the other side of the quantum well layer. The device can also include an electrode electrically connected to the p-doped alloy layer and an electrode electrically connected to the n-doped alloy layer. According to one embodiment the thickness of the n-doped alloy layer is less than the wavelength of light generated by the quantum well layer to allow light generated by the quantum well layer to tunnel to the medium (e. g. , air). In another embodiment, the entire layer structure can have a thickness that is less than the wavelength.