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. 29, 2009
Filed:
Dec. 27, 2007
Zhi-xian Huang, Taichung County, TW;
Hong-xi Cao, Kaohsiung County, TW;
Kun-chieh Chang, Tainan, TW;
Fu-shun Ho, Kaohsiung, TW;
Chun-chieh Yang, Kaohsiung, TW;
Zhi-Xian Huang, Taichung County, TW;
Hong-Xi Cao, Kaohsiung County, TW;
Kun-Chieh Chang, Tainan, TW;
Fu-Shun Ho, Kaohsiung, TW;
Chun-Chieh Yang, Kaohsiung, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
The system for stabilizing wavelength of LED (light emitting diode) radiation in backlight module of the LCD (liquid crystal display) comprises two photodiodes, a plurality of LEDs, a microprocessor unit (MCU) and a driver circuit, wherein two photodiodes have different photo sensitivities in response different wavelengths. A target value, associated with a ration of photo sensitivities of the two photodiodes under two different wavelength radiations, is stored to the MCU as a referred value. Thus, another wavelength (or wavelength variation) of LED radiation is derived by comparing another target value with the referred value. The MCU determines a correction constant based on a color match function of the derived wavelength, and outputs a compensation signal to compensate LED, wherein the compensation signal is equal to multiplication of the correction constant and an original light intensity compensation signal for compensating light intensity loss of the LED.