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英国留学生光学应用论文定制:一个免费的平台液晶莫尔背光—A Moiré-Free Platform for LCD Backlighting

论文作者:英语论文网论文属性:本科毕业论文 Thesis登出时间:2011-07-25编辑:zn1987点击率:4589

论文字数:2785论文编号:org201107251637215375语种:英语 English地区:英国价格:$ 55

关键词:英国留学生光学应用论文Optical componentsOptics

摘要:英语论文网专业提供英国留学生光学应用论文定制,英国留学生电子科技应用论文定制等论文服务。LCD背光使用线性棱镜片,增加正面的亮度。 LCD像素等周期性结构的相互作用导致莫尔条纹。

A Moiré-Free Platform for LCD Backlighting

Abstract
英国留学生光学应用论文 LCD backlights use linear prism films to increase frontal luminance. Interaction of such periodic structures with LCDpixels leads to Moiré fringes. We have developed a Moiré-free platform via randomization of the prismatic microstructure. Additionally, an improvement in materials increases frontal luminance 5-10% over conventional films

1. Introduction
Microstructure Optical components are common in liquid crystal display (LCD) illumination systems. The most ubiquitous of these are the patterned dots (or micro lenses or prisms) on the light guide that is used to spread the light in the plane of the display, and the micro prism films that are used to enhance the luminance of the display. Even though individual microstructures (prisms for example) are small, diffusing layers are still necessary between component films. This is because each microstructure film and the LCD pixels all contain ordered-periodic structures. Due to the close proximity of these components, interference patterns caused by the interaction of the component-to-component microstructures can be easily observed
Prismatic films are optical devices that have one side covered by linear array of micro prisms, typically with a pitch in the range of ten’s of microns. These prism films are a major contributor to Moiré fringes in LCD displays. Several variations of these films are available in the market today. Some of these deviate from perfect linearity, but all are still substantially periodic and pronto Moiré

2. Moiré
The surface relief structure of each component can result in illumination variations (or shadows) that echo the surface topology. Consider the interaction between a prismatic film and the LCD pixels. The prismatic features produce intensity fluctuations or shadows, and these shadows can change form and intensity as a function of viewer location. The LCD pixel array can be described as having a mask function due to the pattern of optical transmission of the array. The interaction of these components is best understood in the frequency domain. The frequency content of the incident intensity fluctuations is convolved with the Fourier transform of the mask function. This results in many spatial frequencies that can produce fringes due tithe replicate (or aliased) spectra of the ordered pixel array. The visible fringes that are observed are an aliasing effect commonly referred to as Moiré fringes (or just Moiré).

The typical approach to eliminating Moiré is to add a diffuser film component between the components that support the interaction. The light scattering property of a diffuser acts to provide optical blur between the interfering components. An important attribute of a diffuser is that it lacks an ordered structure. This lack of ordered structure prevents the diffuser itself from contributing to
Moiré. The drawback of using a diffuser is that frontal luminance is reduced by the scattering and, of course, the need for the additional component(s).

7. References
[1] Kolchak, E. G. Optical structure and method of making. US Patent No. 6862141, 2005.
[2] Kolchak, E. G. www.51lunwen.org/Optical/ Optical structure and method of making. US Patent No. 2005/0225865, 2005.
[3] Whitehouse, David J: HANDBOOK OF SURFACE METROLOGY, Rank Taylor Hobson Ltd, 1999.

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