Quantum Dot Based Enhancement or Elimination of Color Filters for Liquid Crystal Display

Shih, Yu-Chou; Shi, Frank G.

doi:10.1109/jstqe.2017.2748923

Cited by 31 publications

(12 citation statements)

References 15 publications

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“…Proponents boasted of a good contrast ratio and viewing angle, owing to the device's self‐emitting characteristics 1 . Before long, however, LCD makers responded by improving their color and luminance performance: In 2017, they began incorporating quantum dot (QD)‐enhanced LED backlights in TV sets 2 . Since then, OLED and QD‐LCD display technologies have dominated the premium TV market, each having pros and cons in its underlying technology.…”

Section: Figurementioning

confidence: 99%

“…1 Before long, however, LCD makers responded by improving their color and luminance performance: In 2017, they began incorporating quantum dot (QD)-enhanced LED backlights in TV sets. 2 Since then, OLED and QD-LCD display technologies have dominated the premium TV market, each having pros and cons in its underlying technology. Still, there seemed to be few remarkable innovations to make up for each device's weak points until now with QD displays' development.…”

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confidence: 99%

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QD Display: A Game‐Changing Technology for the Display Industry

Lee¹

2020

Information Display

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Section: Figurementioning

confidence: 99%

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confidence: 99%

QD Display: A Game‐Changing Technology for the Display Industry

Lee¹

2020

Information Display

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“…Yin et al combined CsPbBr3 perovskite and CdSe QDs to develop a green–red color conversion layer that achieved a color gamut standard (NTSC) of 129% [ 38 ]. Shih et al suggested the use of QDs composite materials in place of color filters for full-color displays and achieved 86.16% conversion efficiency through the implementation of a QDs color conversion layer [ 39 ]. Furthermore, current displays add a color filter to improve color purity, which absorbs most of the wavelength band and only allows specific wavelengths to pass.…”

Section: Introductionmentioning

confidence: 99%

Use of Recycling-Reflection Color-Purity Enhancement Film to Improve Color Purity of Full-Color Micro-LEDs

2022

Nanoscale Res Lett

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A common full-color method involves combining micro-light-emitting diodes (LEDs) chips with color conversion materials such as quantum dots (QDs) to achieve full color. However, during color conversion between micro-LEDs and QDs, QDs cannot completely absorb incident wavelengths cause the emission wavelengths that including incident wavelengths and converted wavelength through QDs, which compromises color purity. The present paper proposes the use of a recycling-reflection color-purity-enhancement film (RCPEF) to reflect the incident wavelength multiple times and, consequently, prevent wavelength mixing after QDs conversion. This RCPEF only allows the light of a specific wavelength to pass through it, exciting blue light is reflected back to the red and green QDs layer. The prototype experiment indicated that with an excitation light source wavelength of 445.5 nm, the use of green QDs and RCPEFs increased color purity from 77.2% to 97.49% and light conversion efficiency by 1.97 times and the use of red QDs and RCPEFs increased color purity to 94.68% and light conversion efficiency by 1.46 times. Thus, high efficiency and color purity were achieved for micro-LEDs displays. Graphical Abstract

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“…The combination of phosphors and color filter inevitably brings narrow color gamut and low optical efficiency, which is antithetical to the requirements of next-generation displays [7][8]. As a potential game changer, quantum dots (QDs) have become a new research hotspot, which show the advantages of high efficiency, wide color gamut, satisfactory optical purity, adjustable color spectrum, and so on [9][10][11][12][13]. Currently, the QD enhanced film has gradually become mature for LCD backlights due to its unique photoluminescence characteristic and structural compatibility [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Tripling Light Conversion Efficiency of μLED Displays by Light Recycling Black Matrix

et al. 2022

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Quantum-dot color conversion film (QDCCF) with a partitioned black matrix (BM) realizes effective color generation with low crosstalk for micro-light-emitting diode (μLED) displays. However, this traditional BM seriously deteriorates light conversion efficiency (LCE) of QD converted μLED displays due to its absorption energy loss. In this paper, a novel internal and external reflective black matrix (IERBM) is proposed to improve the LCE and blue light utilization (BLU) by light recycling and reuse. Based on the IERBM structural optimization, the LCE can be respectively improved by 3.39× and 2.74× for red and green QDCC sub-pixels, and the BLU can be effectively increased by 1.11×. Accurate white balance and high color uniformity are achieved by this μLED display. Meanwhile, both the crosstalk of 1.72% and the color gamut of 89.8% Rec. 2020 are comparable with traditional absorptive BM. It is also found that the proposed IERBM has the potential to weaken μLED's sidewall effect. This work may open up a new technological route for improving the optical performance in advanced self-emissive displays.

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Quantum Dot Based Enhancement or Elimination of Color Filters for Liquid Crystal Display

Cited by 31 publications

References 15 publications

QD Display: A Game‐Changing Technology for the Display Industry

QD Display: A Game‐Changing Technology for the Display Industry

Use of Recycling-Reflection Color-Purity Enhancement Film to Improve Color Purity of Full-Color Micro-LEDs

Tripling Light Conversion Efficiency of μLED Displays by Light Recycling Black Matrix

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