Improving the Color Gamut of a Liquid-crystal Display by Using a Bandpass Filter

Yan Sun; Chi Zhang; Yanling Yang; Hongmei Ma; Yubao Sun

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자료유형: 학술저널

저자정보: Yan Sun (Hebei University of Technology) Chi Zhang (Hebei University of Technology) Yanling Yang (Hebei University of Technology) Hongmei Ma (Hebei University of Technology) Yubao Sun (Hebei University of Technology)

저널정보: 한국광학회 Current Optics and Photonics Current Optics and Photonics Vol.3 No.6

발행연도: 2019.12

수록면: 590 - 596 (7page)

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To improve the color gamut of a liquid-crystal display (LCD), we propose a bandpass filter that is added to the backlight unit to optimize the backlight spectrum. The bandpass filter can only transmit red, green and blue light in the visible range, while reflecting the unwanted light. We study the optical properties of the bandpass filter using the transfer-matrix method, and the effect of the bandpass filter on the color gamuts of LCDs is also investigated. When a bandpass filter based on a 5-layer configuration comprising low and high refractive indices ((HL)²H) is used in phosphor-converted white-light-emitting diode (pc-WLED), K₂SiF<SUB>6</SUB>:Mn<SUP>4+</SUP> (KSF-LED), and quantum-dot (QD) backlights, the color gamuts of the LCDs improve from 72% to 95.3% of NTSC, from 92% to 106.7% of NTSC, and from 104.3% to 112.2% of NTSC respectively. When the incident angle of light increases to 30°, the color gamuts of LCDs with pc-WLED and KSF-LED backlights decrease by 2.9% and 1% respectively. For the QD backlight, the color gamut almost does not change. When the (HL)²H structure is coated on the diffusion film, the color gamut can be improved to 92.6% of NTSC (pc-WLED), 105.6% of NTSC (KSF-LED), and 111.9% of NTSC (QD). The diffusion film has no obvious effect on the color gamut. The results have an important potential application in wide-color-gamut LCDs.

#Thin film interference #Bandpass filter #Color gamut

참고문헌 (22)

참고문헌 신청

K. Kakinuma / 2006 / Technology of wide color gamut backlight with light-emitting diode for liquid crystal display television / Jpn. J. Appl. Phys 45:4330

H. W. Chen / 2017 / Going beyond the limit of an LCD’s color gamut / Light Sci. Appl 6:e17043

R. D. Zhu / 2015 / Realizing Rec. 2020 color gamut with quantum dot displays / Opt. Express 23:23680~23693

H. W. Chen / 2018 / Liquid crystal display and organic light-emitting diode display : present status and future perspectives / Light. Sci. Appl 7:17168

C. F. He / 2017 / Wide color gamut LCD module using white light LED / Proc. SPIE 10244:102440O

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