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Study on Improvements in the Emission Properties of Quantum-Dot Film-Based Backlights
New Phys.: Sae Mulli 2019; 69: 861~866
Published online August 30, 2019;
© 2019 New Physics: Sae Mulli.

Su Jeong KIM1, Hyo Won JANG1, Jung-Gyun LEE1, Jae-Hyeon KO1*, Young Wook KO2, Yongduk KIM2

1School of Nano Convergence Technology, Nano Convergence Technology Center, Hallym University, Gangwon 24252, Korea
2Cheorwon Plasma Research Institute, Cheorwon 24062, Korea
Correspondence to:
Received July 8, 2019; Revised July 18, 2019; Accepted July 18, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The dependences of the emitting properties of quantum-dot (QD)-based liquid-crystal-display (LCD) backlights on the backlight configuration were investigated in this study. When the QD films were combined with a wedge-shaped light guide plate (LGP), the color conversion efficiency was low, and a significant color separation that depended on the viewing angle was observed. Once several optical films had been put over the LGP+QD combination, multiple diffuse reflections occurred between the reflection film and several optical films, which increased the color conversion efficiency of the QD films and reduced the angular color dispersion. The luminance properties were investigated as functions of the configurations of the QD films, the LGP and the optical films. As a result, the configuration of “Green QD film−LGP−Red QD film−Diffuser film−Prism films” showed the best luminance performance. This study showed that the configuration of the QD films in the backlight should be optimized according to the backlight structure and the combination of optical films when the QD films are applied to a LCD backlight for achieving a high color gamut.
PACS numbers: 42.15.Eq, 42.79.Kr
Keywords: Display, Quantum dot, Backlight, Optical films

February 2020, 70 (2)
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