Ultra-High Light Extraction Efficiency and Ultra-Thin Mini-LED Solution by Freeform Surface Chip Scale Package Array

Huang, Che-Hsuan; Kang, Chieh-Yu; Chang, Shu-Hsiu; Lin, Chih‐Hao; Lin, Chungwei; Wu, Tingzhu; Sher, Chin‐Wei; Lin, Chien-Chung; Lee, Po-Tsung; Kuo, Hao‐Chung

doi:10.3390/cryst9040202

Cited by 25 publications

(12 citation statements)

References 21 publications

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“…Two important parameters of evaluating the thickness of a direct-lit backlight module are the distance between the light source and the receiving surface, called the optical distance (OD), and the LED array alignment pitch, called "Pitch" [40]. A smaller OD value means a thinner backlight module and a larger Pitch value means a smaller number of LEDs are used.…”

Section: Some Important Parametersmentioning

confidence: 99%

Mini-LED Backlight Technology Progress for Liquid Crystal Display

et al. 2022

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As consumers pursue higher display quality, Mini-LED backlight technology has become the focus of research in the current display field. With its size advantage (100–200 μm), it can achieve one-thousand-level divisional dimming, and it can also be combined with quantum dot technology to greatly improve the contrast, color gamut, dark state and other element of the display performance of LCD displays. Mini-LED backlight technology is undoubtedly the most ideal solution to realize a highly dynamic range display of LCD displays, and has been widely commercialized in many fields such as TVs, tablet computers, notebook computers, and car monitors. This review mainly introduces the efforts made by researchers to eliminate the halo effect, thinning of the backlight module and reducing the backlight power consumption. The application of quantum dot technology in backlight is also presented. We predict that the number of Mini-LED backlight partitions is expected to reach a level of more than 3000 in the future, further utilizing the advantages of the small size in local dimming, but it will also inevitably be challenged by some issues such as power consumption and heat dissipation.

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Section: Some Important Parametersmentioning

confidence: 99%

Mini-LED Backlight Technology Progress for Liquid Crystal Display

et al. 2022

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“…Li et al proposed a two-layer encapsulation structure that combines SiO 2 and graphite nanoparticles to improve the uniformity and environmental contrast. Chen et al proposed a direct lighting mini-chip-level packaged LED that combines a QD film with a diffuser and prism films to improve the brightness and uniformity and to reduce the number of LEDs used [ 40 , 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

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

Cheng

Liu³

et al. 2021

Nanomaterials

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Mini-light-emitting diodes (mini-LEDs) were combined with multiple three-dimensional (3D) diffuse reflection cavity arrays (DRCAs) to produce thin, large-area, high-brightness, flat light source modules. The curvature of the 3D free-form DRCA was optimized to control its light path; this increased the distance between light sources and reduced the number of light sources used. Experiments with a 12.3-inch prototype indicated that 216 mini-LEDs were required for a 6 mm optical mixing distance to achieve a thin, large-area surface with high brightness, uniformity, and color saturation of 23,044 cd/m2, 90.13%, and 119.2, respectively. This module can serve as the local dimming backlight in next generation automotive displays.

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“…The architecture of a mini-LED backlight includes (1) a blue light array and (2) a color conversion diaphragm [6]. Owing to the differences in the design of single light sources, blue light arrays with different shape designs have various light extraction efficiencies, including angle light extraction characteristics and freeform-designed chip-scale package [7] with large luminous angle characteristics that have significant advantages. In the light color conversion technology, due to the evolution of phosphor and quantum dots in packaging technology [8][9][10], stable high color saturation requirements have been achieved.…”

Section: Introductionmentioning

confidence: 99%

Research on a Novel GaN-Based Converted Mini-LED Backlight Module via a Spectrum-Decouple System

et al. 2020

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Owing to the development of modern display technology, micro-and mini-light-emitting diodes (LEDs) have affected technological advancements in the display industry. The structure of mini-LEDs is completely different than that of traditional LED backlights because the former employs a display technology with an LED array structure, optical resonant cavity, and color conversion layer. Display backlight technology encounters difficulty in achieving a truly effective energy-loss mechanism when designing or measuring mini-LED performance. The present study proposes three major mini-LED energy loss mechanisms: cross-talk, resonant, and quantum conversion losses. Herein, the spectrum was obtained through the integrating sphere system, and the calculation mechanism was formed by the down-conversion theorem as the decoupling principle, which successfully calculated the independent energy-loss efficiency of each mechanism and effectively deduced the brightness and color saturation performance of this design combination.

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Ultra-High Light Extraction Efficiency and Ultra-Thin Mini-LED Solution by Freeform Surface Chip Scale Package Array

Cited by 25 publications

References 21 publications

Mini-LED Backlight Technology Progress for Liquid Crystal Display

Mini-LED Backlight Technology Progress for Liquid Crystal Display

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

Research on a Novel GaN-Based Converted Mini-LED Backlight Module via a Spectrum-Decouple System

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