共面转换液晶显示器中获得对比度高于1:600的新技术

薄膜晶体管液晶电视(TFT-LCD TV)因为具有薄、轻、紧凑和可随意放置的特点，已经占据了大部分电视机市场。除了这些物理特性以外，最重要的特性是已具有了良好像质的对比度。为了将对比度提高到1：600以上，对偏振片膜、背光源板、滤色片树脂、电极锥角和摩擦条件等都进行了研究。优化的背光板组合，光滑的电极锥角和摩擦方法的控制是提高对比度的主要控制因素。应用新开发的滤色片树脂，对获得高对比度最为有效。     

高灰度级TFT-LCD显示系统的实现

提出了一种以FPGA为核心控制器的高灰度级TFT-LCD显示系统的设计方案。该系统采用幅值-帧速率控制调制-空间混合灰度调制方法,首先将10 bit的R、G、B信号分割成高8 bit数据和低2 bit数据,低2 bit数据经过空间处理后平均分到4个相邻的8 bit数据上,然后把这8 bit数据继续分割成高6 bit数据和低2 bit数据,其中高6 bit数据用于幅值调制,低2 bit数据用于帧速率控制调制,从而实现1 024个灰度等级显示。试验结果表明,该系统具有良好的显示效果和较高的显示灰度等级。     

Decision support in machine vision system for monitoring of TFT-LCD glass substrates manufacturing

This study addresses classification methodology for the automatic inspection of a range of defects on the surface of glass substrates in thin film transistor liquid crystal display glass substrate manufacturing. The proposed methodology consisted of four stages: (1) feature extraction by calculating the wavelet co-occurrence signature from the substrate images, (2) handling of imbalanced dataset using the Synthetic Minority Over-sampling TEchnique (SMOTE), (3) reduction of the feature's dimension by principal component analysis, and (4) finally choosing the best classifier between three different methods: Classification And Regression Tree (CART), Multi-Layer Perceptron (MLP) and Support Vector Machine (SVM). In training the SVM and MLP classifiers, the simulated annealing algorithm was used to obtain the optimal tuning parameters for the classifiers. From the industrial case study, the proposed feature extraction algorithm could remove the defect-irrelevant image features and SMOTE increased the accuracy of all three methods. Furthermore, the optimized SVM and MLP models were more accurate than the CART model whereas a higher accuracy of 89.5% was observed for the proposed SVM model.     

基于ARM的真彩LCD驱动程序设计

该文首先研究了SAMSUNG S3C2440 ARM芯片的LCD控制模块及液晶屏的接口,然后研究了NEC NL2432 3.5寸LCD真彩液晶屏的逻辑及成像原理。在此基础上,基于LINUX操作系统,对LCD驱动程序进行研究和实验,实验结果表明:本文研究出的LCD驱动程序适应性好,能够适应上述硬件芯片环境;系统稳定性好,能够得到清晰稳定的真彩画面。     

Reading from computer screen versus reading from paper: does it still make a difference?

Four experiments were conducted to test whether recent developments in display technology would suffice to eliminate the well-known disadvantages in reading from screen as compared with paper. Proofreading speed and performance were equal for a TFT-LCD and a paper display, but there were more symptoms of eyestrain in the screen condition accompanied by a strong preference for paper (Experiment 1). These results were replicated using a longer reading duration (Experiment 2). Additional experiments were conducted to test hypotheses about the reasons for the higher amount of eyestrain associated with reading from screen. Reduced screen luminance did not change the pattern of results (Experiment 3), but positioning both displays in equal inclination angles eliminated the differences in eyestrain symptoms and increased proofreading speed in the screen condition (Experiment 4). A paper-like positioning of TFT-LCDs seems to enable unimpaired reading without evidence of increased physical strain.

Practitioner Summary: Given the developments in screen technology, a re-assessment of the differences in proofreading speed and performance, well-being, and preference between computer screen and paper was conducted. State-of-the-art TFT-LCDs enable unimpaired reading, but a book-like positioning of screens seems necessary to minimise eyestrain symptoms.     

Preliminary cost estimates for thin-film transistor liquid–crystal display inspection and repair equipment: A hybrid hierarchical approach

The thin-film transistor liquid–crystal display (TFT-LCD) industry has developed rapidly in recent years. Because TFT-LCD manufacturing is highly complex and requires different tools for different products, accurately estimating the cost of manufacturing TFT-LCD equipment is essential. Conventional cost estimation models include linear regression (LR), artificial neural networks (ANNs), and support vector regression (SVR). Nevertheless, in accordance with recent evidence that a hierarchical structure outperforms a flat structure, this study proposes a hierarchical classification and regression (HCR) approach for improving the accuracy of cost predictions for TFT-LCD inspection and repair equipment. Specifically, first-level analyses by HCR classify new unknown cases into specific classes. The cases are then inputted into the corresponding prediction models for the final output. In this study, experimental results based on a real world dataset containing data for TFT-LCD equipment development projects performed by a leading Taiwan provider show that three prediction models based on HCR approach are generally comparable or better than three conventional flat models (LR, ANN, and SVR) in terms of prediction accuracy. In particular, the 4-class and 5-class support vector machines in the first-level HCR combined with individual SVR obtain the lowest root mean square error (RMSE) and mean average percentage error (MAPE) rates, respectively.     

S3C2410TFT—LCD显示的驱动程序设计

系统地介绍了S3C2410微处理器内置的LCD控制器功能与结构,TFT型彩色LCD显示的基本工作原理,LCD显示屏与微处理器的连接,通过编写S3C2410的LCD端口初始化及LCD初始化驱动程序,实现了LCD清晰稳定的显示。为汽车行驶记录仪中人机界面设计提供了很好的解决方案。     

湿法刻蚀FI CD均一性的影响因素及提高刻蚀均一性的研究

随着高分辨率产品导入,TFT-LCD阵列段各项参数范围越来越小,工艺要求更为严格,为了更好地管控湿法刻蚀各项参数,本文以湿法刻蚀FI CD(Final Inspection Critical Dimension)均一性的影响因素及如何提高FI CD均一性为目的进行研究。首先,通过对湿法刻蚀设备参数(主要包括刻蚀液温度、流量、压力、浓度、Nozzle Sliding、Oscillation Speed、刻蚀时间等)进行试验,验证各项参数对FI CD均一性的影响。其次,对沉积工序、曝光工序以及产品设计等进行试验,获悉影响因素并进行改善。通过对湿法刻蚀设备自身参数的调整,如减少设备温度、流量、压力波动,使参数保持相对稳定状态,可有效改善湿法刻蚀FI CD均一性,FI CD的均一性可从1.0降低至0.5。通过对湿法刻蚀设备参数进行试验并做相应调整,湿法刻蚀FI CD均一性改善效果显著。     

一种液晶面板设备故障诊断专家系统

在液晶面板制造设备故障诊断中,传统方法存在效率低、经验分散等缺陷,为此设计了一种基于规则的设备故障诊断专家系统,能够缩短诊断设备故障时间,高效地整合了故障诊断经验资源。产生式规则按照固定的格式,并具有与人的思维相似,直观、自然、容易理解等特点,将其应用到该专家系统中的知识库中,提高了知识库的增长速度和准确度。实际应用表明,该系统可准确判别液晶面板设备故障原因并提供解决方案,将诊断设备故障平均时间降低了35.5%。     

TFT-LCD背光源用CCFL玻管的工艺性能要求与发展趋势

随着薄膜晶体管液晶显示(TFT-LCD)产业的迅猛发展,冷阴极荧光灯(CCFL)凭借其优良性能成为背光源的重要光源之一.叙述了国内外CCFL玻管的工艺性能要求和化学组成,并指出了CCFL玻管的发展趋势.