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:
Dec. 13, 2011
Filed:
Jul. 08, 2008
Ming-ji Dai, Chiayi County, TW;
Chun-kai Liu, Taipei, TW;
Heng-chieh Chien, Taipei County, TW;
Chih-kuang Yu, Chiayi, TW;
Sheng-liang LI, Taipei, TW;
Ming-Ji Dai, Chiayi County, TW;
Chun-Kai Liu, Taipei, TW;
Heng-Chieh Chien, Taipei County, TW;
Chih-Kuang Yu, Chiayi, TW;
Sheng-Liang Li, Taipei, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
An apparatus for measuring a characteristic and a chip temperature of an LED includes a thermal conductive component. An LED chip is disposed on the thermal conductive component. A temperature control unit is connected to the thermal conductive component for providing a temperature to the thermal conductive component, and therefore providing the temperature to the LED chip via the thermal conductive component. A power-source and voltage-meter unit provides a current to the LED chip, and measures a voltage value of the LED chip. Under a measurement mode, the current is featured with a current waveform having a high current level and a low current level which are alternatively changed, for applying to the LED chip. Measurements are conducted respectively corresponding to the high current level and the low current level, and a correlation curve between the voltage and the temperature can be obtained with the results of measurement.