The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 2011
Filed:
Jan. 14, 2009
Ming-te Lin, Hsin Chu, TW;
Kuang-yu Tai, Hsin Chu, TW;
Jyh-chen Chen, Jhogli, TW;
Farn-shiun Hwu, Yangmei Township, Taoyuan County, TW;
Ming-Te Lin, Hsin Chu, TW;
Kuang-Yu Tai, Hsin Chu, TW;
Jyh-Chen Chen, Jhogli, TW;
Farn-Shiun Hwu, Yangmei Township, Taoyuan County, TW;
Industrial Technology Research Institute, Hsin Chu, TW;
National Central University, Jhongli, unknown;
Abstract
The present invention provides a method for measuring the PN-junction temperature of a light-emitting diode (LED), which uses a reference voltage to establish the function of current, real power, power factor, or driving-time interval on temperature. The initial and thermal-equilibrium values of current, real power, power factor, or driving-time interval are measured, and hence the variations thereof are calculated. Referring to the pre-established function, the temperature change is given. By the temperature change and the initial temperature, the PN-junction temperature of the LED is thereby deduced.