Volume 15 Issue 1
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Chinese Optics  > 2022  >  15(1): 132-143.
JI Hong-lei, CHENG Shang-jun, LI Peng-fei, ZHANG Yan, GE Zi-yi, ZHONG Hai-zheng. Illustrating the Helmholtz-Kohlrausch effect of quantum dots enhanced LCD through a comparative study[J]. Chinese Optics, 2022, 15(1): 132-143. doi: 10.37188/CO.2021-0058
Citation: JI Hong-lei, CHENG Shang-jun, LI Peng-fei, ZHANG Yan, GE Zi-yi, ZHONG Hai-zheng. Illustrating the Helmholtz-Kohlrausch effect of quantum dots enhanced LCD through a comparative study[J]. Chinese Optics, 2022, 15(1): 132-143. doi: 10.37188/CO.2021-0058
shu

Illustrating the Helmholtz-Kohlrausch effect of quantum dots enhanced LCD through a comparative study

  • 1.

    Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049

  • 3.

    School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081

  • 4.

    R & D Center, TCL Electronics Co., Ltd., Shenzhen 518000, China

  • 5.

    Ningbo Excite Technology Co., Ltd., Ningbo 315000, China

Funds:  Supported by National Key R&D Program (No. 2017YFB0404600)
More Information
  • Author Bio:

    Ji Hong-lei (1980—), male, born in Baicheng City, Jilin province. He obtained his Master degree in 2007 from Changchun University of Science and Technology. He is senior engineer and now working at TCL Electronics R&D Center. His project is focused on the research of new materials and technologies for display technology. E-mail: jihl@tcl.com

    Cheng Shang-jun (1997—), male, born in Yining, XinJiang Province, he obtained his Bachelor′s degree in 2019 from Beijing Institute of Technology (BIT). His project is focused on the research of perovskite quantum dot based composites for photonic and optoelectronic applications. E-mail: 3120191108@bit.edu.cn

    Li Peng-fei (1994—), male, born in Handan City, Hebei Province. He obtained his Master degree in 2019 from Harbin Institute of Technology. He is now a electronic R&D engineer at TCL. He mainly engaged in the research of visual perception. E-mail: pengfei7.li@tcl.com

    Zhong Hai-zheng (1981—), male, born in Qinghe City, Hebei Province. He obtained his Bachelor′s degree in 2003 from Jilin University, and then undertook his Ph.D. studies at the Institute of Chemistry, Chinese Academy of Sciences (ICCAS) with Prof. Yongfang Li from 2003 to 2008. His current research interests are in the area of colloidal quantum dots for photonics and optoelectronics. E-mail: hzzhong@bit.edu.cn

  • Corresponding author: pengfei7.li@tcl.com; hzzhong@bit.edu.cn
  • Received Date: 17 Mar 2021
  • Rev Recd Date: 27 Apr 2021
  • Accepted Date: 28 May 2021
    • Available Online: 28 May 2021
  • Publish Date: 19 Jan 2022
    Abstract
  • Helmholtz-Kohlrausch effect (H-K effect) describes the influence of color purity on the perceived brightness of a colored object. Quantum dots (QD) based backlights can enhance the color quality of Liquid Crystal Display (LCD) with improved perceived brightness due to the well-known H-K effect. However, the H-K effect of QD embedded TVs (also known as QLED TV) has not been fully demonstrated. In this paper, we investigated the H-K effect of QLED TVs through a comparative study between QLED backlights and YAG-LED backlights. By comparing the viewers’ experimental results with the Kaiser and Nayatani model, we demonstrate that a QLED TV shows significant H-K effect. To achieve the same perceived brightness with YAG-LED TV, the physical brightness of QLED TV was greatly decreased to 75% for pure red, 86% for pure green, and 74%-88% for bright colorful images. Moreover, QLED TVs are strongly preferred over YAG-LED TVs even when both QLED TV and YAG-LED TV show the same perceived brightness. The results imply the bright future of QLED TVs toward healthly displays.

     

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