Mini-LEDs with Diffuse Reflection Cavity Arrays and Quantum Dot Film for Thin, Large-Area, High-Luminance Flat Light Source

Ye, Zhi Ting; Cheng, Yuan; Liu, Ku Huan; Yang, Kai Shiang

doi:10.3390/nano11092395

Cited by 12 publications

(6 citation statements)

References 47 publications

(48 reference statements)

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“…Another approach is to laminate optical films in the backlight unit to shape the light profile before it enters the LC panel. Based on these two methods, novel mini-LED backlight systems supporting spatial light intensity modulation are proposed to prevent the light crosstalk and to maintain the luminance and color uniformity of the zones 34 , 75 – 79 . On the software side, Seetzen et al 80 proposed a local dimming algorithm (called maximum method algorithm 80 ) to systematically optimize the LCD transmittance and spatial profile of mini-LED backlight.…”

Section: Efficiency Enhancement In Vrmentioning

confidence: 99%

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

et al. 2022

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Liquid crystal displays (LCDs) and photonic devices play a pivotal role to augmented reality (AR) and virtual reality (VR). The recently emerging high-dynamic-range (HDR) mini-LED backlit LCDs significantly boost the image quality and brightness and reduce the power consumption for VR displays. Such a light engine is particularly attractive for compensating the optical loss of pancake structure to achieve compact and lightweight VR headsets. On the other hand, high-resolution-density, and high-brightness liquid-crystal-on-silicon (LCoS) is a promising image source for the see-through AR displays, especially under high ambient lighting conditions. Meanwhile, the high-speed LCoS spatial light modulators open a new door for holographic displays and focal surface displays. Finally, the ultrathin planar diffractive LC optical elements, such as geometric phase LC grating and lens, have found useful applications in AR and VR for enhancing resolution, widening field-of-view, suppressing chromatic aberrations, creating multiplanes to overcome the vergence-accommodation conflict, and dynamic pupil steering to achieve gaze-matched Maxwellian displays, just to name a few. The operation principles, potential applications, and future challenges of these advanced LC devices will be discussed.

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Section: Efficiency Enhancement In Vrmentioning

confidence: 99%

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

et al. 2022

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“…The hybrid QD-PMMA monomer layers were coated poly (ethylene terephthalate) (PET) films as covering layers, using an automat coater to produce sandwich-like structures. The PET/QD-PMMA/PET film was th inated and cured through irradiation with 365 nm UV light for 30 s. Finally, a docto coater was used to coat the optical diffusion layer (ODL) onto the PET/QD-PMM film to form an ODL/PET/QD-PMMA/PET/ODL film [45], as shown in Figure 3. The diffusion layer was used to control the transmission-reflection ratio.…”

Section: Fabrication Of Qd Filmmentioning

confidence: 99%

Wide-Angle Mini-Light-Emitting Diodes without Optical Lens for an Ultrathin Flexible Light Source

Chen

Chin²,

Tsai³

et al. 2022

Micromachines

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This report outlines a proposed method of packaging wide-angle (WA) mini-light-emitting diode (mini-LED) devices without optical lenses to create a highly efficient, ultrathin, flexible planar backlight for portable quantum dot light-emitting diode (QLED) displays. Since the luminous intensity curve for mini-LEDs generally recommends a beam angle of 120°, numerous LEDs are necessary to achieve a uniform surface light source for a QLED backlight. The light-guide layer and diffusion layer were packaged together on a chip surface to create WA mini-LEDs with a viewing angle of 180°. These chips were then combined with a quantum dot (QD) film and an optical film to create a high-efficiency, ultrathin, flexible planar light source with excellent color purity that can be used as a QLED display backlight. A 6 in (14.4 cm) light source was used as an experimental sample. When 1.44 W was supplied to the sample, the 3200-piece WA mini-LED with a flexible planar QLED display had a beam angle of 180° on the luminous intensity curve, a planar backlight thickness of 0.98 mm, a luminance of 10,322 nits, and a luminance uniformity of 92%.

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“…However, achieving uniform light distribution with direct-lit backlights often results in a thicker backlight profile and necessitates the use of a greater number of LEDs [11]. To reduce the thickness of direct-lit backlights, extensive efforts have been made to maintain high optical performance, including specific optical designs of the light guide layer with a microstructure of concave parabel-surface microlens, reflective dots on the top surface of the LGP, and multiple three-dimensional diffuse reflection cavity arrays [12][13][14]. Different hybrid backlight structures that combine the elements of both edge-lit and directlit technologies are also used to reduce the thickness of direct-lit backlights [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

The Development of a Remote Edge-Lit Backlight Structure with Blue Laser Diodes

Chen,

Ying,

Pham

et al. 2024

Photonics

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In this study, we introduce a novel design of a remote edge-lit backlight structure featuring blue laser diodes (LDs). These LDs were integrated into a remote yellow phosphor layer on a light guide plate (LGP). Blue light emitted by the LDs passes through the LGP and spreads to the remote phosphor layer, generating white light output. Owing to the incorporation of a scattering layer between sequential LGPs, the remote edge-lit backlight structure facilitates the expansion of the output surface of the LGP by combining multiple individual LGPs. Two- and three-LGP remote edge-lit backlight structures demonstrated acceptable white illuminance uniformity. The proposed architecture serves as a viable solution for achieving uniform illumination in planar lighting systems using blue LDs; thus, this structure is particularly suitable for linear lighting or slender backlighting instead of display stand applications.

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Mini-LEDs with Diffuse Reflection Cavity Arrays and Quantum Dot Film for Thin, Large-Area, High-Luminance Flat Light Source

Cited by 12 publications

References 47 publications

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

Wide-Angle Mini-Light-Emitting Diodes without Optical Lens for an Ultrathin Flexible Light Source

The Development of a Remote Edge-Lit Backlight Structure with Blue Laser Diodes

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