- 标题
- 摘要
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37.5: Hybrid Backlight System based on Blue, Red LEDs and Perovskite Quantum Dots for Liquid Crystal Display Application
摘要： This paper reports a novel backlight system for liquid crystal display by combining blue and red emissive LEDs and perovskite quantum dots embedded composite films as color converters. The backlights can realize 95% BT.2020 color gamut with a brightness of 90% relative to the backlight using blue LEDs and YAG. In comparison to the backlights using blue LEDs, perovskite quantum dots and K2SiF6:Mn4+ phos- phors, this backlight system suppresses the tailing problem for dynamic dimming from red emissive K2SiF6:Mn4+ phosphors.
关键词： color gamut,perovskite quantum dots,delayed response time,hybrid backlight,dual LEDs
更新于2025-09-11 14:15:04
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P‐8.4: A Novel Non‐barrier‐film Quantum Dot Diffusion Plate in Backlight System
摘要： Compared with traditional LED backlight source, the quantum dot-based backlight module has recently attracted extensive interest owing to their wider color gamut. Generally, quantum dots are sensitive to the external environment, and quantum dots in current commercial quantum dot film are usually protected by two barrier film layers to isolate the influence of external factors such as water and oxygen. In this report, a new quantum dot plate strategy was three-layer co-extrusion method developed by a without the use of any expensive barrier film. Quantum dots were homogeneous embedded in the polymeric matrix of the middle layer, and the upper and lower layer act as protective layers to avoid the destruction of external environment to quantum dots. Reliability tests demonstrate that this non-barrier-film quantum dot plate shows satisfactory stability comparable high-barrier-material-based quantum dot films under conditions of blue-LED irradiation, high temperature and high humidity.
关键词： Optical Plate,Backlight,Quantum Dot,Extrusion,Wide-Color-Gamut
更新于2025-09-11 14:15:04
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Visual-quality Guided Global Backlight Dimming for Video Display on Mobile Devices
摘要： This paper proposes a visual-quality guided global backlight dimming (VQG-GBD) algorithm to reduce the power consumption of liquid-crystal display (LCD) on mobile devices. We build a backlight scaling ratio (BSR) prediction model via visual quality assessment (VQA) which considers not only display contents but also backlight intensity while measuring video quality. Also, we add visual uncertainty as an indicator to dim the backlight without being noticed by observers. VQG-GBD includes a training stage and online stage. For training stage, firstly, we collect videos with distinct attributes of brightness and uncertainty. Then, subjective rating obtains the relationship among visual quality, BSR, brightness, and visual uncertainty. Finally, we use the trust-region method (TRM) to build the BSR prediction model. In online stage, the model is applied to mobile devices for real-time video display. And a BSR optimization strategy is proposed to eliminate the flicker effect between frames, followed by three techniques to accelerate the process: motion vector (MV) extraction and pixel subsampling reduce the computation while analyzing frame content; GPU rendering speed up the pixel compensation. Experimental results show that VQG-GBD achieves averagely 21% of power demand reduction for displaying video on mobile devices while preserving good visual quality. VQG-GBD delivers more power reduction than the state-of-the-art algorithm image integrity-based gray-level error control (I2GEC) and multi-histogram-based gray-level error control (MGEC) by 10% and 8% respectively.
关键词： Global backlight dimming,mobile devices,visual uncertainty,ACR11,subjective visual quality assessment,liquid-crystal display,trust-region method
更新于2025-09-09 09:28:46