A novel temperature compensated operation scheme for trichromatic LED backlights

Dong-Woo Lee; Jin-Ha Kim; Moo-Youn Park; Hee-Dong Kim; Jae-Kyuk Park; Soo-Ryong Hwang; Sung-Min Cho

doi:10.1117/12.710757

13 February 2007 A novel temperature compensated operation scheme for trichromatic LED backlights

Dong-Woo Lee, Jin-Ha Kim, Moo-Youn Park, Hee-Dong Kim, Jae-Kyuk Park, Soo-Ryong Hwang, Sung-Min Cho

Proceedings Volume 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI; 648612 (2007) https://doi.org/10.1117/12.710757
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

Trichromatic LED backlights render higher color gamut and panel transmittance to liquid crystal displays (LCDs) than yellow phosphor-converted white LED backlights can possibly do at their best. In realization, however, several technical challenges arise, such as colour shift due to the ambient temperature change, decrease in brightness at elevated temperature, an enlarged dead zone for colour mixing, minimizing the total number of chips and so on. In this work, we designed and demonstrated a low-cost driving circuit that stabilizes brightness and colour coordinates of trichromatic LED backlights using a thermistor as a temperature compensating element. By applying the temperature compensation, the amounts of the brightness and colour shift were reduced to 54% and 51% of the uncompensated cases, respectively.

Citation Download Citation

Dong-Woo Lee, Jin-Ha Kim, Moo-Youn Park, Hee-Dong Kim, Jae-Kyuk Park, Soo-Ryong Hwang, and Sung-Min Cho "A novel temperature compensated operation scheme for trichromatic LED backlights", Proc. SPIE 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI, 648612 (13 February 2007); https://doi.org/10.1117/12.710757

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