摘要:

Abstract—New processing technologies for large‐area high‐resolution TFT‐LCDs have been developed. A taper‐etching technology for Cr gate electrodes with a resistivity of 18 μΩ/cm was realized. The technology allows control of the taper angle down to as low as 2°. The breakdown voltage between the gate electrodes and the source‐drain electrodes was improved from 140 V to over 400 V. A new end‐point‐detection method using N2plasma emission for the photoresist stripping process has been developed. The method decreases the contact resistance and improves the transfer characteristics of TFTs. These processing technologies make possible the realization of 10‐in.‐diagonal TFT‐

ISSN:1071-0922    

DOI:10.1889/1.1984838

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract—A noncrossing TFT matrix and drive scheme that eliminates dc level‐shift differences among data and reduces crosstalk without a storage capacitor is proposed. To compensate for the dc level shift, an extra TFT is added to each pixel. By applying a compensation pulse to the TFT, the dc level‐shift differences among data are reduced to less than 0.01 V. The compensating TFT also provides redundancy. The peak‐to‐peak data voltage amplitude is lowered by changing the reference voltage according to the LC cell voltage polarity. By using the lowered data voltage and the shielded reference bus structure, crosstalk is reduced sufficiently to allow for 64 gr

ISSN:1071-0922    

DOI:10.1889/1.1984840

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract—The source (or data) bus‐line to common (or backplane) electrode coupling effect in TFT‐LCDs has been investigated through experiment and simulation using a new model. The important feature of this simulated model is that the common electrode consists of a network of discrete resistors. The horizontal crosstalk is caused by this coupling effect, and the mechanism of the crosstalk has become clear by the simulation of 5‐in. TFT‐LCDs. By adopting this simulation, useful information for large‐area TFT‐LCD designs can be obtained. As an example, this simulation has been performed for 10‐ and 15‐in. TFT‐LCDs and the requirement for a common resistance h

ISSN:1071-0922    

DOI:10.1889/1.1984841

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract—New flicker‐reduction and high‐speed drive methods are proposed for use in high‐resolution liquid‐crystal TVs. The new flicker‐reduction delta‐inversion drive method changes the drive polarity in every line and field. In addition, one of the three color pixels in the same line is driven in reverse polarity. In this method, the plain flicker due to field‐inversion driving is transformed into a column flicker similar to the column‐inversion drive method. The column‐flicker spatial frequency in our method is the highest of that in any other flicker‐reduction drive method for high‐resolution LCTVs with more than 1000 horizontal pixels. The high‐speed preparatory drive method is achieved by driving individual pixels twice per field. The first drive is a dummy drive made two lines before the actual drive. The second drive is the actual drive. The drive time can be virtually twice as long as that for conventional methods, if the vertical image correlation is strong. The combination of these two methods yields high‐quality images for large‐s

ISSN:1071-0922    

DOI:10.1889/1.1984842

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract—The image‐processing techniques used in a newly developed video printer are described. The amount of image data is reduced by subsampling the chrominance signals and by data compression. The DPCM algorithm is used for the compression. A field‐interpolation algorithm that takes into account the correlation between diagonal dots is proposed. This algorithm is simple and has better spatial‐frequency characteristics than the bi‐linear interpolation algorithm. A color‐signal‐conversion circuit that enables users to adjust the color, tint, contrast, and luminance after capturing an image is a

ISSN:1071-0922    

DOI:10.1889/1.1984843

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract—In matrix display devices, image quality is influenced by pixel‐structure noise (fixed‐pattern noise) originating from the pixel arrangement. The influence of this noise on image resolution and color is investigated for four types of color pixel arrangements. Spatial Nyquist limits (SNLs) based on pixel reciprocal lattices are first applied to determine the primary resolution of these devices. Then actual visual resolution limits (VRLs), which are obtained by subjectively evaluating sinusoidal patterns displayed on simulated displays, are compared to the SNLs in order to assess quantitatively the color pixel arrangements. The ratios of VRLs to SNLs (corresponding to the Kell factors) are 0.6–0.7 for white patterns, but only 0.5–0.6 for patterns of one of the three primary colors due to pixel‐structure noise. A subjective evaluation of color‐bar patterns of ten colors shows that image colors, especially greenish colors, are influenced by the pixel‐

ISSN:1071-0922    

DOI:10.1889/1.1984844

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY

摘要:

Abstract—Methods and tools used to produce rapid prototypes of human‐computer interfaces are discussed, with primary focus on hypermedia‐based tools. Rapid prototyping should begin early in the design definition process to focus on user‐interface requirements and issues that might otherwise be overlooked by more‐traditional approaches. Hypermedia products such as HyperCard and SuperCard are extremely useful in this process because of their flexibility and powerful user‐interface design features. In addition to providing insights and initial concept definition, the prototyping process can be enhanced by adding automated software‐engineering support functions that increase productivity. This paper describes the development and use of the rapid interface prototyping (RIP) system, which supports the design, prototyping, and development of large computer‐based information systems at McDonnell Douglas Training Systems. Built upon hypermedia tools, the RIP System fosters consistency of displays/interactions, automates some of the time‐consuming aspects of user‐interface software development, and reduces sof

ISSN:1071-0922    

DOI:10.1889/1.1984845

出版商:Blackwell Publishing Ltd    

年代:1993

数据来源: WILEY