Ambient contrast ratio of quantum-dot color-converted micro-LED displays

Deng, Liwen; Zhang, Xiang; Yan, Yinguo; Xiao, Yuze; Yao, Ziming; Chen, Enguo; Xu, Sheng; Ye, Yun; Sun, Jun; Yan, Qun; Guo, Tailiang

doi:10.1016/j.rinp.2023.106462

Cited by 13 publications

(3 citation statements)

References 48 publications

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“…In the QDTCC structure, the CFs not only block blue light leakage but also prevent the effect of the ambient light. 37 However, limitations exist in the absorption efficiency of CFs, particularly in the green filter. This is because the spectral proximity of the blue and green regions leads to a significant 34% transmission of blue light through the green filter (for detailed absorptions spectrum of blue, green, and red CFs, refer to Figure S4a).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Color filters (CFs) comprise photoresists blended with pigments that are designed to selectively absorb unwanted wavelengths of light, allowing only those desired wavelengths to transmit. In the QDTCC structure, the CFs not only block blue light leakage but also prevent the effect of the ambient light . However, limitations exist in the absorption efficiency of CFs, particularly in the green filter.…”

Section: Resultsmentioning

confidence: 99%

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Highly Efficient Fine-Pitch Quantum Dot/Titanium Oxide Nanocomposites for Ultrahigh-Resolution Full-Color Micro-Light Emitting Diode Displays

Liang,

Kuo,

Shen

et al. 2024

ACS Photonics

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The development of full-color micro-LED displays has driven research on color conversion technology. Although various color conversion methods have been proposed, practical fine-pitch displays have posed a challenge owing to the insufficient efficiency and low absorption in the slim thickness of color conversion material patterns and the serious optical crosstalk between adjacent subpixels. Herein, we introduce a prototype of a full-color micro-LED display featuring high-resolution colloidal quantum dot (QD)/TiO2 nanoparticle composite arrays with an active-matrix blue light micro-LED module. This innovative QD composite is prepared using a hybrid method involving ligand-selective dispersion and scattering particles, allowing a considerable increase in pattern resolution and conversion efficiency. Moreover, an optical structure design featuring a distributed Bragg reflector and a dual-site light-confining matrix is employed, resulting in a high color gamut of 92.8% with regard to the National Television Standards Committee. Finally, a 0.7 in. active-matrix QD micro-LED display prototype is demonstrated with a resolution of 960 × 540 (1588 ppi) for the first time.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Highly Efficient Fine-Pitch Quantum Dot/Titanium Oxide Nanocomposites for Ultrahigh-Resolution Full-Color Micro-Light Emitting Diode Displays

Liang,

Kuo,

Shen

et al. 2024

ACS Photonics

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show abstract

“…Micro-LEDs utilize shorter wavelengths of blue light for two reasons: First, the primary material of the color-conversion layer QD:TiO 2 nanoparticles (NPs) has a higher absorbance for shorter-wavelength blue light. − Second, these wavelengths are farther from the green-light spectrum. Due to the incomplete absorption of blue light by the QD, the color-conversion layer consisting only of QD:titanium dioxide (TiO 2 ) NPs (also called QDCCs) will exhibit blue leakage upon excitation by blue light.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Peak Light-Emitting-Diode (LED) Wavelengths for Enhanced Color Performance and Visual Health in Blue Micro-LED Displays with Color-Conversion Layers

Ji,

Dai,

Zhang

et al. 2024

ACS Appl. Opt. Mater.

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This study examines the brightness conversion of green and red quantum dot (QD) color converters (QDCCs) utilizing blue-light panels at 437, 450, and 460 nm. The blue-light panels are separately tested under the same electrical power and optical power. The measurement results indicate that, as the wavelength of blue light becomes shorter, the conversion efficiency of QD emission increases, resulting in a higher brightness of the converted QDs. The QD emission conversion efficiency follows the order 437 > 450 > 460 nm. However, due to the lower energy of longer-wavelength blue light, more blue photons are generated per unit of optical power (radiant flux) compared to shorter-wavelength blue light. Therefore, the difference in the QD emission brightness resulting from the conversion is not significant. For instance, the QD emission brightness stimulated by 460 nm blue light is only slightly lower, approximately 4%, compared to that stimulated by 450 nm blue light. Considering that short-wavelength blue light can potentially damage biological tissues, especially the eyes, the development of longer-wavelength blue light will become a focal point for the next generation of QDbased micro-LED displays, which can be a promising technology for augmented reality (AR) and virtual reality (VR) display system. We computed the color gamut of QDCCs stimulated by blue light at 437, 450, and 460 nm; the yellow color filter (Y-CF)/QDCCs generated 115.7%, 112.4%, and 104.7% relative to National Television System Committee (NTSC). In addition, green and red color filters (G/R-CF)/QDCCs produce color gamut values of 117.0%, 114.2%, and 110.0% relative to NTSC, respectively. Finally, in the matter of color gamut coverage, it is evident that utilizing a blue excitation light source with a longer wavelength of 460 nm is essential for achieving full coverage of the blue region within the NTSC or BT2020 color gamut. It can effectively solve color shifts in the blue color.

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Monolithic Integration of Full‐Color Microdisplay Screen with Sub‐5 µm Quantum‐Dot Pixels

Huang,

Li,

Zhu

et al. 2024

Advanced Materials

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Monolithic integration of color‐conversion materials onto blue‐backlight micro‐light‐emitting‐diodes (micro‐LEDs) has emerged as a promising strategy for achieving full‐color microdisplay devices. However, this approach still encounters challenges such as the blue‐backlight leakage and the poor fabrication yield rate due to unsatisfied quantum dot (QD) material and fabrication process. Here, the monolithic integration of 0.39‐inch micro‐display screens displaying colorful pictures and videos are demonstrated, which are enabled by creating interfacial chemical bonds for wafer‐scale adhesion of sub‐5 µm QD‐pixels on blue‐backlight micro‐LED wafer. The ligand molecule with chlorosulfonyl and silane groups is selected as the synthesis ligand and surface treatment material, facilitating the preparation of high‐efficiency QD photoresist and the formation of robust chemical bonds for pixel integration. This is a leading record in micro‐display devices achieving the highest brightness larger than 400 thousand nits, the ultrahigh resolution of 3300 PPI, the wide color gamut of 130.4% NTSC, and the ultimate performance of service life exceeding 1000 h. These results extend the mature integrated circuit technique into the manufacture of micro‐display device, which also lead the road of industrialization process of full‐color micro‐LEDs.

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Ambient contrast ratio of quantum-dot color-converted micro-LED displays

Cited by 13 publications

References 48 publications

Highly Efficient Fine-Pitch Quantum Dot/Titanium Oxide Nanocomposites for Ultrahigh-Resolution Full-Color Micro-Light Emitting Diode Displays

Highly Efficient Fine-Pitch Quantum Dot/Titanium Oxide Nanocomposites for Ultrahigh-Resolution Full-Color Micro-Light Emitting Diode Displays

Optimizing Peak Light-Emitting-Diode (LED) Wavelengths for Enhanced Color Performance and Visual Health in Blue Micro-LED Displays with Color-Conversion Layers

Monolithic Integration of Full‐Color Microdisplay Screen with Sub‐5 µm Quantum‐Dot Pixels

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