LCD Backlights

Hwang, In-Sun; Ko, Jae‐Hyeon

doi:10.1002/9781119161387.ch6

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…Since PC and PMMA are the most common polymers in LGP (Chen and Yu, 2007;Hwang and Ko, 2018), an additional classification procedure was set up and implemented to identify polymers. Virgin PC and PMMA were used as training samples in order to recognize the polymer constituting LGP fragments.…”

Section: Hierarchical Classification Proceduresmentioning

confidence: 99%

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Hierarchical modelling for recycling-oriented classification of shredded spent flat monitor products based on HyperSpectral Imaging

et al. 2020

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The number of flat monitors from televisions, notebooks and tablets has increased dramatically in recent years, thus resulting in a corresponding rise in Waste from Electrical and Electronic Equipment (WEEE). This fact is linked to the production of new high-performance electronic devices. Taking into account a future volume growth trend of WEEE, the implementation of adequate recycling architectures embedding recognition/classification logics to handle the collected WEEE physical-chemical attributes, is thus necessary. These integrated hardware and software architectures should be efficient, reliable, low cost, and capable of performing detection/control actions to assess: i) WEEE composition and ii) physical-chemical attributes of the resulting recovered flow streams. This information is fundamental in setting up and implementing appropriate recycling actions. In this study, a hierarchical classification modelling approach, based on Near InfraRed (NIR) - Hyperspectral Imaging (HSI), was carried out. More in detail, a 3-step hierarchical modelling procedure was designed, implemented and set up in order to recognize different materials present in a specific WEEE stream: End-of-Life (EoL) shredded monitors and flat screens. By adopting the proposed approach, different categories are correctly recognized. The results obtained showed how the proposed approach not only allows the set up of a “one shot” quality control system, but also contributes towards improving the sorting process.

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Section: Hierarchical Classification Proceduresmentioning

confidence: 99%

“…The image obtained, including only the particles classified as "LGP fragments", was used as validation set to per-form a new classification addressed at identifying polymer type. Literature reports (Hwang and Ko, 2018)…”

Section: Polymer Identificationmentioning

confidence: 99%

Hierarchical modelling for recycling-oriented classification of shredded spent flat monitor products based on HyperSpectral Imaging

et al. 2020

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Optimization of the optical structure of thin direct-lit LED backlights for LCD applications by using micro-LEDs

Lee

2019

Journal of Information Display

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The optimized optical structure of the micro-LED-based direct-lit backlight was investigated through optical simulation. The backlight consisted of only one diffuser plate and an array of micro-LEDs with a reflection film positioned on the bottom of the backlight. An additional reflector was put on top of each micro-LED to prevent the formation of bright spots. Under several number density conditions of the microbeads in the diffuser plate, stable regions were found on the gap-pitch plot, where a high Mura index of ∼ 1 was secured. The bead density needed to be small (around 10 4 mm −3) to maintain above 60% transmittance, because the transmittance of the backlight was significantly reduced at higher bead densities. Under the 10 4 mm −3 bead density condition, the gap can be reduced to 1.5 mm at a 3 mm pitch. The gap can be further reduced if additional optical films, such as a diffuser sheet, a prism film, and a reflective polarizer, will be adopted in the backlight. This work demonstrated that micro-LEDs are ideal light sources for realizing a thin direct-lit backlight for LCD applications.

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LCD Backlights

Cited by 2 publications

References 23 publications

Hierarchical modelling for recycling-oriented classification of shredded spent flat monitor products based on HyperSpectral Imaging

Hierarchical modelling for recycling-oriented classification of shredded spent flat monitor products based on HyperSpectral Imaging

Optimization of the optical structure of thin direct-lit LED backlights for LCD applications by using micro-LEDs

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