Patents by Inventor Fei-Chang Hwang
Fei-Chang Hwang 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).
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Patent number: 8803166Abstract: An arrangement of light emitting diodes including a first micro-die, a second micro-die, a first bridge, a second bridge and a substrate supporting the first micro-die and the second micro die. The first micro-die includes a first edge having a first end and a second end, a second edge opposite and not parallel to the first edge, a first connecting portion near the first end, and a second connecting portion near the second end.Type: GrantFiled: August 23, 2010Date of Patent: August 12, 2014Assignee: Epistar CorporationInventors: Ming-Te Lin, Fei-Chang Hwang, Chia-Tai Kuo
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Patent number: 8053791Abstract: A structure of light-emitting diode (LED) dies having an AC loop (a structure of AC LED dies), which is formed with at least one unit of AC LED micro-dies disposed on a chip. The unit of AC LED micro-dies comprises two LED micro-dies arranged in mutually reverse orientations and connected with each other in parallel, to which an AC power supply may be applied so that the LED unit may continuously emit light in response to a positive-half wave voltage and a negative-half wave voltage in the AC power supply. Since each AC LED micro-die is operated forwardly, the structure of AC LED dies also provides protection from electrical static charge (ESD) and may operate under a high voltage.Type: GrantFiled: April 15, 2009Date of Patent: November 8, 2011Assignee: Industrial Technology Research InstituteInventors: Ming-Te Lin, Fei-Chang Hwang, Chia-Tai Kuo
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Publication number: 20110133769Abstract: An LED package interface inspection apparatus for an LED device comprises a current source, a voltage measuring unit, and a testing control unit. The testing control unit provides at least one control signal to command the current source to output at least one current for the LED device. The testing control unit also provides at least two signals to command the voltage measuring unit to measure a first forward voltage of the LED device at a first time and a second forward voltage of the LED device at a second time. The testing control unit calculates a voltage difference between the first forward voltage and the second forward voltage, and determines that the LED device is defective if the voltage difference is larger than a predetermined threshold value.Type: ApplicationFiled: June 25, 2010Publication date: June 9, 2011Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Chiu Ling CHEN, Fei Chang Hwang, Chien Ping Wang, Sheng Pan Huang
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Patent number: 7888942Abstract: A life test device comprises an oven, a current source, a voltage meter, a control module, and a process module. A light-emitting diode (LED) is disposed in the oven. The temperature of the oven is gradually changed in a first period and remains at a set temperature in a second period. The current source provides a first current and a second current to the LED. The voltage meter measures forward voltages of the LED. The control module controls the current source to output the first or second current to the LED and controls the voltage meter to measure the forward voltages of the LED. The process module calculates a junction temperature of the LED according to the forward voltages and a variation relationship formula between the forward voltages and the temperature of the oven.Type: GrantFiled: November 21, 2008Date of Patent: February 15, 2011Assignee: Industrial Technology Research InstituteInventors: Chiu-Ling Chen, Sheng-Pan Huang, Fei-Chang Hwang
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Publication number: 20110012137Abstract: A structure of light-emitting diode (LED) dies having an AC loop (a structure of AC LED dies), which is formed with at least one unit of AC LED micro-dies disposed on a chip. The unit of AC LED micro-dies comprises two LED micro-dies arranged in mutually reverse orientations and connected with each other in parallel, to which an AC power supply may be applied so that the LED unit may continuously emit light in response to a positive-half wave voltage and a negative-half wave voltage in the AC power supply. Since each AC LED micro-die is operated forwardly, the structure of AC LED dies also provides protection from electrical static charge (ESD) and may operate under a high voltage.Type: ApplicationFiled: August 23, 2010Publication date: January 20, 2011Applicants: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, EPISTAR CORPORATIONInventors: Ming-Te LIN, Fei-Chang Hwang, Chia-Tai Kuo
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Publication number: 20100327872Abstract: A life test device comprises an oven, a current source, a voltage meter, a control module, and a process module. A light-emitting diode (LED) is disposed in the oven. The temperature of the oven is gradually changed in a first period and remains at a set temperature in a second period. The current source provides a first current and a second current to the LED. The voltage meter measures forward voltages of the LED. The control module controls the current source to output the first or second current to the LED and controls the voltage meter to measure the forward voltages of the LED. The process module calculates a junction temperature of the LED according to the forward voltages and a variation relationship formula between the forward voltages and the temperature of the oven.Type: ApplicationFiled: November 21, 2008Publication date: December 30, 2010Applicant: Industrial Technology Research InstituteInventors: Chiu-Ling Chen, Sheng-Pan Huang, Fei-Chang Hwang
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Publication number: 20090218580Abstract: A structure of light-emitting diode (LED) dies having an AC loop (a structure of AC LED dies), which is formed with at least one unit of AC LED micro-dies disposed on a chip. The unit of AC LED micro-dies comprises two LED micro-dies arranged in mutually reverse orientations and connected with each other in parallel, to which an AC power supply may be applied so that the LED unit may continuously emit light in response to a positive-half wave voltage and a negative-half wave voltage in the AC power supply. Since each AC LED micro-die is operated forwardly, the structure of AC LED dies also provides protection from electrical static charge (ESD) and may operate under a high voltage.Type: ApplicationFiled: April 15, 2009Publication date: September 3, 2009Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INTSITUTEInventors: Ming-Te LIN, Fei-Chang Hwang, Chia-Tai Kuo
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Patent number: 7531843Abstract: A structure of light-emitting diode (LED) dies having an AC loop (a structure of AC LED dies), which is formed with at least one unit of AC LED micro-dies disposed on a chip. The unit of AC LED micro-dies comprises two LED micro-dies arranged in mutually reverse orientations and connected with each other in parallel, to which an AC power supply may be applied so that the LED unit may continuously emit light in response to a positive-half wave voltage and a negative-half wave voltage in the AC power supply. Since each AC LED micro-die is operated forwardly, the structure of AC LED dies also provides protection from electrical static charge (ESD) and may operate under a high voltage.Type: GrantFiled: November 23, 2004Date of Patent: May 12, 2009Assignee: Industrial Technology Research InstituteInventors: Ming-Te Lin, Fei-Chang Hwang, Chia-Tai Kuo
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Publication number: 20080218093Abstract: A structure of light-emitting diode (LED) dies having an AC loop (a structure of AC LED dies), which is formed with at least one unit of AC LED micro-dies disposed on a chip. The unit of AC LED micro-dies comprises two LED micro-dies arranged in mutually reverse orientations and connected with each other in parallel, to which an AC power supply may be applied so that the LED unit may continuously emit light in response to a positive-half wave voltage and a negative-half wave voltage in the AC power supply. Since each AC LED micro-die is operated forwardly, the structure of AC LED dies also provides protection from electrical static charge (ESD) and may operate under a high voltage.Type: ApplicationFiled: May 9, 2008Publication date: September 11, 2008Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Ming-Te Lin, Fei-Chang Hwang, Chia-Tai Kuo
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Publication number: 20060044864Abstract: A structure of light-emitting diode (LED) dies having an AC loop (a structure of AC LED dies), which is formed with at least one unit of AC LED micro-dies disposed on a chip. The unit of AC LED micro-dies comprises two LED micro-dies arranged in mutually reverse orientations and connected with each other in parallel, to which an AC power supply may be applied so that the LED unit may continuously emit light in response to a positive-half wave voltage and a negative-half wave voltage in the AC power supply. Since each AC LED micro-die is operated forwardly, the structure of AC LED dies also provides protection from electrical static charge (ESD) and may operate under a high voltage.Type: ApplicationFiled: November 23, 2004Publication date: March 2, 2006Inventors: Ming-Te Lin, Fei-Chang Hwang, Chia-Tai Kuo
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Publication number: 20020085379Abstract: The invention is a surface light source generator that can provide surface light with a high luminosity and uniformity and a small dispersion angle. The invention uses the light emitting diodes (LEDs) for industrial standard light bulb packaging as its basis. By redesigning the shape of the LED elements (e.g., hexagonal pillars, quadrangle pillars or triangular pillars) and disposing a plurality of same type LEDs together, a surface type illuminator comprised of many closely packed LED elements is formed. Using the convergent effect of the convex lens on top of the LED elements, the light dispersion angle is controlled within 15 degrees. Such a technique of packing many LED elements together can increase the unit area luminosity of the surface light source generator and, at the same time, achieve a high luminosity and uniformity.Type: ApplicationFiled: August 27, 2001Publication date: July 4, 2002Inventors: Wei-Kuo Han, Johnson Su, Ye-Jung Tang, Adrian Wing Fai Lo, Fei-Chang Hwang
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Patent number: 6163038Abstract: A white light-emitting diode and a method of fabricating the same diode are disclosed. The white light-emitting diode is fabricated by epitaxy, which can produce two peaks in the spectrum at the P-N junction by appropriately adjusting epitaxial parameters such as temperature, pressure, NH.sub.3 flux and the ratio of H.sub.2 to N.sub.2 or the concentration of dopant, such as Mg or Si. The diode can thus radiate white light by adjusting the wavelength and the intensity of the principal peak in the two peaks. Further, quantum well structure can be formed in the diode. By appropriately adjusting the epitaxial parameters, the spectrum of the quantum well structures may have more than one peak. Therefore, white light can be generated by combining the light with wavelengths at two or three different peaks. The white LED can radiate white light itself and need not involve combining many LEDs, so that the cost and the difficulty of fabricating the white LED lamp can be reduced.Type: GrantFiled: May 14, 1998Date of Patent: December 19, 2000Assignee: Industrial Technology Research InstituteInventors: Chin-Yuan Chen, Chao-Nien Huang, Fei-Chang Hwang, Ming-Huang Hong, Eric G. Lean