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https://doi.org/10.3938/NPSM.68.1029
Study on the Effects of Ultraviolet Light and Temperature on Optical Films for Display Backlights
New Phys.: Sae Mulli 2018; 68: 1029~1034
Published online September 28, 2018;  https://doi.org/10.3938/NPSM.68.1029
© 2018 New Physics: Sae Mulli.

Jung Taek HONG, Jae-Hyeon KO*

Department of Physics, Hallym University, Chuncheon 24252, Korea
Correspondence to: hwangko@hallym.ac.kr
Received August 1, 2018; Revised August 6, 2018; Accepted August 6, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The effects of ultraviolet (UV) irradiation and temperature on the degradation of the optical components in the backlight for liquid crystal displays were investigated. The degrees of degradation of the side molds made of polycarbonate and the multi-layer-type reflective polarizers were estimated for different UV irradiation levels and temperatures by measuring the change in the color coordinates over time. For ambient temperatures, the side mold showed a more substantial degradation at shorter UV wavelengths. The reflective polarizer exhibited accelerated degradation at shorter UV wavelengths at room temperature, but it displayed similar changes in the color coordinates at high temperatures, indicating that the temperature is a more dominant factor from the viewpoint of degradation. Based on this systematic study of the degradation process, we suggest that the long-term reliability of displays may be improved by optimizing the UV shield and by thermal management of the backlight components.
PACS numbers: 42.15.Eq, 42.79.Kr
Keywords: Display, Backlight, Optical films, Ultraviolet, Temperature


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