Experimental and numerical analysis of hygrothermal deformation of backlight modules

Wei-Chung Wang; Hsuan-Hao Hsu; Ya-Hsin Chang

doi:10.1117/12.839254

25 August 2009 Experimental and numerical analysis of hygrothermal deformation of backlight modules

Wei-Chung Wang, Hsuan-Hao Hsu, Ya-Hsin Chang

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73753F (2009) https://doi.org/10.1117/12.839254
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

The main function of backlight modules (BLMs) of thin film transistor liquid crystal displays (TFT-LCDs) is to provide steady and intensive illumination for the whole monitor. Warpage of BLMs can produce non-uniform brightness in TFT-LCDs and result in the so-called Mura effect. In this paper, a warpage inspection system of BLMs was assembled. Experiment was designed to simulate the real working conditions of temperature and humidity, i.e. hygrothermal working conditions, of BLMs. Phase-shifting technique was adopted to improve the resolution of shadow moiré fringes. The surface morphology under different working conditions of BLMs was then obtained and plotted. The out-of-plane displacement fields of BLMs under the same working conditions was also analyzed by the commercially available finite element software ANSYS and compared with the experimental results. Finally, thermal stress distribution of BLMs can be calculated from the modified ANSYS model.

Citation Download Citation

Wei-Chung Wang, Hsuan-Hao Hsu, and Ya-Hsin Chang "Experimental and numerical analysis of hygrothermal deformation of backlight modules", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73753F (25 August 2009); https://doi.org/10.1117/12.839254

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