Patents by Inventor Ghulam Hasnain
Ghulam Hasnain has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8026527Abstract: A light emitting device, a wafer for making the same, and method for fabricating the same are disclosed. The device and wafer include a first layer of a first conductivity type, an active layer, and a layer of a second conductivity type. The active layer overlies the first layer, the active layer generating light. The second layer overlies the active layer, the second layer having a first surface in contact adjacent to the active layer and a second surface having a surface that includes features that scatter light striking the second surface. A layer of transparent electrically conducting material is adjacent to the second surface and covered by a first layer of a dielectric material that is transparent to the light generated by the active layer. A mirror layer that has a reflectivity greater than 90 percent is deposited on the first layer of dielectric material.Type: GrantFiled: December 6, 2007Date of Patent: September 27, 2011Assignee: Bridgelux, Inc.Inventors: Ghulam Hasnain, Steven D. Lester
-
Publication number: 20110182064Abstract: A light source and method for making the same are disclosed. The light source includes a plurality of Segmented LEDs connected in parallel to a power bus and a controller. The power bus accepts a variable number of Segmented LEDs. The controller receives AC power and provides a power signal on the power bus. Each Segmented LED is characterized by a driving voltage that is greater than 3 times the driving voltage of a conventional LED fabricated in the same material system as the Segmented LED. The number of Segmented LEDs in the light source is chosen to compensate for variations in the light output of individual Segmented LEDs introduced by the manufacturing process. In another aspect of the invention, the number of Segmented LEDs connected to the power bus can be altered after the light source is assembled.Type: ApplicationFiled: April 5, 2011Publication date: July 28, 2011Inventors: Ghulam Hasnain, Syn-Yem Hu, Steven D. Lester
-
Patent number: 7982409Abstract: A light source and method for making the same are disclosed. The light source includes a plurality of Segmented LEDs connected in parallel to a power bus and a controller. The power bus accepts a variable number of Segmented LEDs. The controller receives AC power and provides a power signal on the power bus. Each Segmented LED is characterized by a driving voltage that is greater than 3 times the driving voltage of a conventional LED fabricated in the same material system as the Segmented LED. The number of Segmented LEDs in the light source is chosen to compensate for variations in the light output of individual Segmented LEDs introduced by the manufacturing process. In another aspect of the invention, the number of Segmented LEDs connected to the power bus can be altered after the light source is assembled.Type: GrantFiled: February 26, 2009Date of Patent: July 19, 2011Assignee: Bridgelux, Inc.Inventors: Ghulam Hasnain, Syn-Yem Hu, Steven D. Lester
-
Publication number: 20110169407Abstract: An LED-based lighting device and method for making the same are disclosed. The lighting device includes an LED light source mounted on a heat sink, a power adaptor, and a controller. The power adaptor is configured to be interchangeable with a conventional incandescent bulb power adapter. The controller provides an average current to the LED light source when power is coupled to the device via the power adaptor. The average current causes the LED light source to generate light of a predetermined standard intensity that is substantially independent of variations in the LED light source from device to device. In one aspect of the invention, the LED light source includes a plurality of LEDs connected in series, the LEDs are bonded to the heat sink and connected to one another in series by wire bonds and to conducting traces on the heat sink.Type: ApplicationFiled: March 28, 2011Publication date: July 14, 2011Inventor: Ghulam Hasnain
-
Publication number: 20110163347Abstract: A light source and method for making the same are disclosed. The light source includes a substrate, and a light emitting structure that is divided into segments. The light emitting structure includes a first layer of semiconductor material of a first conductivity type deposited on the substrate, an active layer overlying the first layer, and a second layer of semiconductor material of an opposite conductivity type from the first conductivity type overlying the active layer. A barrier divides the light emitting structure into first and second segments that are electrically isolated from one another. A serial connection electrode connects the first layer in the first segment to the second layer in the second segment. A power contact is electrically connected to the second layer in the first segment, and a second power contact electrically connected to the first layer in the second segment.Type: ApplicationFiled: March 16, 2011Publication date: July 7, 2011Inventor: Ghulam Hasnain
-
Patent number: 7956546Abstract: An LED-based lighting device and method for making the same are disclosed. The lighting device includes an LED light source mounted on a heat sink, a power adaptor, and a controller. The power adaptor is configured to be interchangeable with a conventional incandescent bulb power adapter. The controller provides an average current to the LED light source when power is coupled to the device via the power adaptor. The average current causes the LED light source to generate light of a predetermined standard intensity that is substantially independent of variations in the LED light source from device to device. In one aspect of the invention, the LED light source includes a plurality of LEDs connected in series, the LEDs are bonded to the heat sink and connected to one another in series by wire bonds and to conducting traces on the heat sink.Type: GrantFiled: May 15, 2009Date of Patent: June 7, 2011Assignee: Bridgelux, Inc.Inventor: Ghulam Hasnain
-
Patent number: 7939839Abstract: A light source and method for making the same are disclosed. The light source includes a substrate, and a light emitting structure that is divided into segments. The light emitting structure includes a first layer of semiconductor material of a first conductivity type deposited on the substrate, an active layer overlying the first layer, and a second layer of semiconductor material of an opposite conductivity type from the first conductivity type overlying the active layer. A barrier divides the light emitting structure into first and second segments that are electrically isolated from one another. A serial connection electrode connects the first layer in the first segment to the second layer in the second segment. A power contact is electrically connected to the second layer in the first segment, and a second power contact electrically connected to the first layer in the second segment.Type: GrantFiled: September 11, 2008Date of Patent: May 10, 2011Assignee: Bridgelux, Inc.Inventor: Ghulam Hasnain
-
Patent number: 7915621Abstract: A light source and method for fabricating the same are disclosed. The light source includes a substrate and a light emitting structure. The substrate has a first surface and a second surface, the second surface including a curved, convex surface with respect to the first surface of the substrate. The light emitting structure includes a first layer of a material of a first conductivity type overlying the first surface, an active layer overlying the first layer, the active layer generating light when holes and electrons recombine therein, and a second layer includes a material of a second conductivity type overlying the active layer and a second surface opposite to the first surface. A mirror layer overlies the light emitting structure.Type: GrantFiled: May 13, 2010Date of Patent: March 29, 2011Assignee: Bridgelux, Inc.Inventor: Ghulam Hasnain
-
Publication number: 20110068672Abstract: A light source having a substrate with a plurality of component LED light generators mounted thereon is disclosed. The substrate has a first metallic surface characterized by a normal that points in a normal direction. The first metallic surface is in contact with air over the first metallic surface. The component LED light generators are mounted directly on the first metallic surface. Each component LED light generator includes an LED characterized by an operating temperature and emitting light in the normal direction. Each LED generator generates more than 0.5 watts of heat. The component LED light generators are spaced apart on the first metallic surface such that the operating temperature remains less than 75° C. above the air temperature. In one aspect of the invention, the first metallic surface surrounding each component LED light generator radiates an amount of heat equal to the heat generated by that component LED light generator.Type: ApplicationFiled: September 22, 2010Publication date: March 24, 2011Inventor: Ghulam Hasnain
-
Publication number: 20110031508Abstract: A method of manufacturing a light-emitting device using laser scribing to improve overall light output is disclosed. Upon placing a semiconductor wafer having light emitting diode (“LED”) devices separated by streets on a wafer chuck, the process arranges a first surface of semiconductor wafer containing front sides of the LED devices facing up and a second surface of semiconductor wafer containing back sides of the LED devices facing toward the wafer chuck. After aligning a laser device over the first surface of the semiconductor wafer above a street, the process is configured to focus a high intensity portion of a laser beam generated by the laser device at a location in a substrate closer to the back sides of the LED devices.Type: ApplicationFiled: October 18, 2010Publication date: February 10, 2011Applicant: Bridgelux, Inc.Inventors: Norihito Hamaguchi, Ghulam Hasnain
-
Publication number: 20100219440Abstract: A light source and method for fabricating the same are disclosed. The light source includes a substrate and a light emitting structure. The substrate has a first surface and a second surface, the second surface including a curved, convex surface with respect to the first surface of the substrate. The light emitting structure includes a first layer of a material of a first conductivity type overlying the first surface, an active layer overlying the first layer, the active layer generating light when holes and electrons recombine therein, and a second layer includes a material of a second conductivity type overlying the active layer and a second surface opposite to the first surface. A mirror layer overlies the light emitting structure.Type: ApplicationFiled: May 13, 2010Publication date: September 2, 2010Inventor: Ghulam Hasnain
-
Publication number: 20100219431Abstract: A light source and method for making the same are disclosed. The light source includes a substrate and a light emitting structure that is deposited on the substrate. A barrier divides the light emitting structure into first and second segments that are electrically isolated from one another. A serial connection electrode connects the first segment in series with the second segment. A first blocking diode between the light emitting structure and the substrate prevents current from flowing between the light emitting structure and the substrate when the light emitting structure is emitting light. The barrier extends through the light emitting structure into the first blocking diode.Type: ApplicationFiled: March 16, 2010Publication date: September 2, 2010Inventors: Ghulam Hasnain, Steven D. Lester, Syn-Yem Hu, Jeff Ramer
-
Patent number: 7741134Abstract: A light source and method for fabricating the same are disclosed. The light source includes a substrate and a light emitting structure. The substrate has a first surface and a second surface, the second surface including a curved, convex surface with respect to the first surface of the substrate. The light emitting structure includes a first layer of a material of a first conductivity type overlying the first surface, an active layer overlying the first layer, the active layer generating light when holes and electrons recombine therein, and a second layer includes a material of a second conductivity type overlying the active layer and a second surface opposite to the first surface. A mirror layer overlies the light emitting structure.Type: GrantFiled: September 15, 2008Date of Patent: June 22, 2010Assignee: Bridgelux, Inc.Inventor: Ghulam Hasnain
-
Publication number: 20100141175Abstract: A light source and method for making the same are disclosed. The light source includes a plurality of Segmented LEDs connected in parallel to a power bus and a controller. The power bus accepts a variable number of Segmented LEDs. The controller receives AC power and provides a power signal on the power bus. Each Segmented LED is characterized by a driving voltage that is greater than 3 times the driving voltage of a conventional LED fabricated in the same material system as the Segmented LED. The number of Segmented LEDs in the light source is chosen to compensate for variations in the light output of individual Segmented LEDs introduced by the manufacturing process. In another aspect of the invention, the number of Segmented LEDs connected to the power bus can be altered after the light source is assembled.Type: ApplicationFiled: February 26, 2009Publication date: June 10, 2010Inventors: Ghulam Hasnain, Syn-Yem Hu, Steven D. Lester
-
Publication number: 20100140630Abstract: A method of manufacturing a light-emitting device using laser scribing to improve overall light output is disclosed. Upon placing a semiconductor wafer having light emitting diode (“LED”) devices separated by streets on a wafer chuck, the process arranges a first surface of semiconductor wafer containing front sides of the LED devices facing up and a second surface of semiconductor wafer containing back sides of the LED devices facing toward the wafer chuck. After aligning a laser device over the first surface of the semiconductor wafer above a street, the process is configured to focus a high intensity portion of a laser beam generated by the laser device at a location in a substrate closer to the back sides of the LED devices.Type: ApplicationFiled: May 1, 2009Publication date: June 10, 2010Applicant: BRIDGELUX, INC.Inventors: Norihito Hamaguchi, Ghulam Hasnain
-
Publication number: 20100134047Abstract: An LED-based lighting device and method for making the same are disclosed. The lighting device includes an LED light source mounted on a heat sink, a power adaptor, and a controller. The power adaptor is configured to be interchangeable with a conventional incandescent bulb power adapter. The controller provides an average current to the LED light source when power is coupled to the device via the power adaptor. The average current causes the LED light source to generate light of a predetermined standard intensity that is substantially independent of variations in the LED light source from device to device. In one aspect of the invention, the LED light source includes a plurality of LEDs connected in series, the LEDs are bonded to the heat sink and connected to one another in series by wire bonds and to conducting traces on the heat sink.Type: ApplicationFiled: May 15, 2009Publication date: June 3, 2010Inventor: Ghulam Hasnain
-
Publication number: 20100065866Abstract: A light source and method for fabricating the same are disclosed. The light source includes a substrate and a light emitting structure. The substrate has a first surface and a second surface, the second surface including a curved, convex surface with respect to the first surface of the substrate. The light emitting structure includes a first layer of a material of a first conductivity type overlying the first surface, an active layer overlying the first layer, the active layer generating light when holes and electrons recombine therein, and a second layer includes a material of a second conductivity type overlying the active layer and a second surface opposite to the first surface. A mirror layer overlies the light emitting structure.Type: ApplicationFiled: September 15, 2008Publication date: March 18, 2010Inventor: Ghulam Hasnain
-
Publication number: 20100059768Abstract: A light source and method for making the same are disclosed. The light source includes a substrate, and a light emitting structure that is divided into segments. The light emitting structure includes a first layer of semiconductor material of a first conductivity type deposited on the substrate, an active layer overlying the first layer, and a second layer of semiconductor material of an opposite conductivity type from the first conductivity type overlying the active layer. A barrier divides the light emitting structure into first and second segments that are electrically isolated from one another. A serial connection electrode connects the first layer in the first segment to the second layer in the second segment. A power contact is electrically connected to the second layer in the first segment, and a second power contact electrically connected to the first layer in the second segment.Type: ApplicationFiled: September 11, 2008Publication date: March 11, 2010Inventor: Ghulam Hasnain
-
Publication number: 20100046221Abstract: A light source and method for making the same are disclosed. The light source includes a housing, a drive assembly, and an LED. The housing has an interior compartment enclosed in an outer surface having a heat dissipating surface and first and second power terminals that are accessible from outside the interior compartment. The drive assembly is located in the interior compartment and electrically connected to the first and second power terminal. The LED is directly attached to the heat dissipating surface and electrically insulated therefrom, the LED having first and second LED power contacts. The housing has first and second housing power terminals disposed outside the housing, electrically isolated from the heat-dissipating surface, and connected to the drive assembly. A first conductor connects the first LED power contact to the first housing power terminal. A second conductor connects the LED second power contact to the second housing power terminal.Type: ApplicationFiled: August 19, 2008Publication date: February 25, 2010Inventors: Jason Loomis Posselt, Michael Solomensky, Steven D. Lester, Ghulam Hasnain
-
Publication number: 20090321775Abstract: A light source and method for fabricating the same are disclosed. The light source includes a substrate and first and second semiconductor layers that surround an active layer. The first layer includes a material of a first conductivity type adjacent to the substrate. The active layer overlies the first layer and generates light when holes and electrons recombine therein. The second layer includes a material of a second conductivity type overlying the active layer, the second layer having a first surface overlying the active layer and a second surface opposite to the first surface. A trench extends through the second layer and the active layer into the first layer. The trench has electrically insulating walls. A first electrode is disposed in the trench such that the first electrode is in electrical contact with the first layer, and the second electrode is in electrical contact with the second layer.Type: ApplicationFiled: June 26, 2008Publication date: December 31, 2009Inventor: Ghulam Hasnain