Simulations of pixel moirés in the liquid crystal display with image processing technique

Joo, Byung-Yun; Shin, Dongho

doi:10.1016/j.displa.2009.08.003

Cited by 18 publications

(9 citation statements)

References 4 publications

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“…According to ITU-R BT. 601 [12,13], the luma value (Y) presents the gray scale of a stimulus. The transformation from RGB to YUV can be expressed as Y 0.299R 0.587G 0.114B, where R, G, and B are color channels of a color image.…”

Section: Spectral Analyses and Moiré Visibility A Background And Notmentioning

confidence: 99%

Approach to analytically minimize the LCD moiré by image-based particle swarm optimization

Tsai

Tien

2015

Appl. Opt.

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In this paper, we proposed a methodology to optimize the parametric window of a liquid crystal display (LCD) system, whose visual performance was deteriorated by the pixel moiré arising in between multiple periodic structures. Conventional analysis and minimization of moiré patterns are limited by few parameters. With the proposed image-based particle swarm optimization (PSO), we enable a multivariable optimization at the same time. A series of experiments was conducted to validate the methodology. Due to its versatility, the proposed technique will certainly have a promising impact on the fast optimization in LCD design with more complex configuration.

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Section: Spectral Analyses and Moiré Visibility A Background And Notmentioning

confidence: 99%

Approach to analytically minimize the LCD moiré by image-based particle swarm optimization

Tsai

Tien

2015

Appl. Opt.

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“…However, deviations in the actual manufacturing of these devices inevitably introduce variations of structure dimensions (periods), which could lead to unexpected moiré profiles as seen in common liquid-crystal devices. Many relevant (moiré) theoretical works [7][8][9][10] also have been algorithmized by analyzing the superposition of structures in the spatial domain (i.e., calculating the convolution in the Fourier frequency domain). In this work, with considering further the mechanism of electromagnetic propagations through microstructures by coupled-wave theory [11][12][13][14], we study optics of moiré phenomena caused by two primary periodic structures: black matrix layer over unpatterned liquid-crystal mediums (with lattice vector ⃗ γ bm ) and other periodic optical structures (with lattice vector ⃗ γ op ) as in the usual applications.…”

Section: Introductionmentioning

confidence: 99%

Approximate scheme by the coupled-wave theory to efficiently analyze the influences of moiré phenomena in liquid-crystal devices

Wang²,

Chang

et al. 2012

Appl. Opt.

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This work studies an approximate scheme by coupled-wave theory to analyze quickly the large-scale moiré phenomena as seen in common liquid-crystal devices. The moiré phenomena are considered to be caused by two periodic structures (with lattice vectors γ[combininb arrow](1) and γ[combininb arrow](2) and show an interference pattern spanning over a length γ(m)=|γ[combininb arrow](1)|·|γ[combininb arrow](2)|/|γ[combininb arrow](1)-γ[combininb arrow](2)| (with γ[combininb arrow](1)=/~γ[combininb arrow](2)). With the coupled-wave theory, the complete analysis of the moiré optics includes at least 2γ(m)/λ (λ: wavelength in vacuum) Fourier components and presents an ineffective computation. This work applies a cos(τ) type approximation for the openings of unpatterned liquid-crystal pixels, and considers the first-order coupling between the Fourier components of pixels and other (periodic) optical structures. We hence arrive at an effective evaluation, including 4τ|γ[combininb arrow](1)|/λ (or 4τ|γ[combininb arrow](2)|/λ) Fourier components, and are able to go back to a complete analysis when considering higher-order couplings at an appropriate τ integer value.

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“…To ensure brightness uniformity and high luminance, the BLU is composed of several kinds of optical materials, namely a light source, reflective sheet, light guide plate (LGP), diffuser sheet, prism sheet, and a mold frame as shown schematically in Fig. 1 [1][2][3][4][5][6][7][8][9][10][11]. Therefore, high refractive materials play an important role in determining LCD efficiency.…”

mentioning

confidence: 99%

Preparation and properties of photocurable, high refractive, 2-naphthol epoxy-modified urethane acrylate

et al. 2011

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The back light unit (BLU) is a core component of liquid crystal displays (LCDs) that are used in notebook computers, mobile phones, navigation devices, flat screen TVs, and public information display (PID) devices, among many others. To enhance the optical efficiency of LCDs, optical films with a high refractive index have been used in the BLU. In particular, high refractive chemicals have been the subject of recent investigations to enhance the optical efficiency of BLUs. In this study, we efficiently synthesized photocurable, high refractive 2-naphthol epoxy-modified urethane acrylate (2-NEUA) from 2-naphthol via a three-step reaction. The refractive index of 2-NEUA was higher than that of 2-naphthol epoxy acrylate (2-NEA), presumably because it contains more integrated aromatic rings and therefore has a higher electron density than 2-NEA. Furthermore, we critically evaluated the effects of 2-NEUA on the mechanical properties of UV curable films in this article.

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Simulations of pixel moirés in the liquid crystal display with image processing technique

Cited by 18 publications

References 4 publications

Approach to analytically minimize the LCD moiré by image-based particle swarm optimization

Approach to analytically minimize the LCD moiré by image-based particle swarm optimization

Approximate scheme by the coupled-wave theory to efficiently analyze the influences of moiré phenomena in liquid-crystal devices

Preparation and properties of photocurable, high refractive, 2-naphthol epoxy-modified urethane acrylate

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