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Thermal Analyses of LED Light Bars and Backlight Modules

Published online by Cambridge University Press:  17 August 2016

M.-Y. Tsai ,
C.-Y. Tang ,
C.-E. Zheng ,
Y.-Y. Tsai  and
C.-H. Chen
M.-Y. Tsai*
Affiliation:
Department of Mechanical EngineeringChang Gung UniversityTaoyuan, Taiwan
C.-Y. Tang
Affiliation:
Department of Mechanical EngineeringChang Gung UniversityTaoyuan, Taiwan
C.-E. Zheng
Affiliation:
Department of Mechanical EngineeringChang Gung UniversityTaoyuan, Taiwan
Y.-Y. Tsai
Affiliation:
Unity Opto Tech. Co.New Taipei, Taiwan
C.-H. Chen
Affiliation:
Unity Opto Tech. Co.New Taipei, Taiwan
*
*Corresponding author (mytsai@mail.cgu.edu.tw)
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Abstract

The effects of various parameters, such as thermal properties of substrates, thermal interface materials (TIMs) and heat sinks on the thermal performance of the light emitting diode (LED) light bars and backlight module are investigated experimentally and numerically in terms of junction temperature (Tj) and thermal resistances from junction to air (Rj-a). The results show that the measured Rj-a of the light bars by powering-on five LEDs in the test is different from one by powering-on only one LED, resulting from the extra heat coming from the adjacent LED packages affecting the Tj for the case of powering-on five LEDs. For the modules, Rj-a is significantly reduced by using the heat sinks for all backlight modules, and aluminum and iron heat sinks do not show any obvious difference in heat dissipation along with any substrates and TIMs. Furthermore, both experimental and simulation results show that the thermal conductivity of the substrates are more important and dominant than TIM and heat sink for the Rj-a of the backlight modules concerned, and also demonstrate that the thermal field for the local model can represent the one in full-scale backlight module.

Keywords

Light emitting diodeBacklight moduleJunction temperatureThermal resistance
Type
Research Article
Information
Journal of Mechanics , Volume 33 , Issue 3 , June 2017 , pp. 331 - 339
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2017 

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