Large-display developments in China

In China, various kinds of displays have been developed in recent years. Normal displays, i.e. on-off type displays such as LED and electromagnetic displays, have been used in many places. These have formed the main display modes in China. Another significant development has been the appearance of giant video displays. The first system has been installed in Xiannongtan Stadium in Beijing. It was used during the opening ceremony of the First Farmer Games of the People's Republic of China, and is intended for further use at the 11th Asian Games to be held in 1990.     

Problem-solving performance as a function of problem type,number progression,and memory load

Abstract

Problem-solving performance with tabular and graphical computer displays was examined as problem type, number progression, and memory capacity were systematically manipulated. Participants used tables and line graphs that depicted linear or multilinear number progressions to solve location, interpolation, trend analysis, and forecasting problems. Experiment 1, in which the displayed information was continuously available, indicated that participants' performance for identifying specific values was better with tables than with graphs. For trend analysis and interpolation problems graphs with multilinear data facilitated performance. While the forecasting tasks did not show any systematic effect of the factors. In Experiment 2, the displayed information was not continuously available, participants performed best with the graphical displays for most conditions. These results are discussed in terms of designing computer information displays.     

Problem-solving performance as a function of problem type, number progression, and memory load

Problem-solving performance with tabular and graphical computer displays was examined as problem type, number progression, and memory capacity were systematically manipulated. Participants used tables and line graphs that depicted linear or multilinear number progressions to solve location, interpolation, trend analysis, and forecasting problems. Experiment 1, in which the displayed information was continuously available, indicated that participants' performance for identifying specific values was better with tables than with graphs. For trend analysis and interpolation problems graphs with multilinear data facilitated performance. While the forecasting tasks did not show any systematic effect of the factors. In Experiment 2, the displayed information was not continuously available, participants performed best with the graphical displays for most conditions. These results are discussed in terms of designing computer information displays.     

Vacuum fluorescent displays: from single digits to colour TV

Physical principles and operational characteristics of various vacuum fluorescent displays are outlined. A VFD history and details of construction are also given. Displays of various resolutions for different applications are described up to a 256 × 256 dot matrix unit. Uniform brightness and precise switching operation are realized using improved anode and grid electrode construction, anode baseplate processing, and grid configuration and its fixing processes. A scrolling VFD and a MOS FET switching array VFD are introduced. The latter uses an integrated circuit of 241 × 246 elements to produce a picture 23 × 23 mm. Prospects for the development of VFDs are given in conclusion.     

Liquid crystal dot-matrix display using multiplexed guest-host effect

A dyed dot-matrix liquid crystal display is described, which is fully compatible with standard LC technology. High brightness and large viewing angle are achieved using the guest-host effect without polarizers. Also, a medium range multiplexing capability is demonstrated over a large temperature range.     

Circular displays: control/display arrangements and stereotype strength with eight different display locations

Two experiments are reported that were designed to investigate control/display arrangements having high stereotype strengths when using circular displays. Eight display locations relative to the operator and control were tested with rotational and translational controls situated on different planes according to the Frame of Reference Transformation Tool (FORT) model of Wickens et al. (2010). (Left. No, Right! Development of the Frame of Reference Transformation Tool (FORT), Proceedings of the Human Factors and Ergonomics Society 54th Annual Meeting, 54: 1022–1026). In many cases, there was little effect of display locations, indicating the importance of the Worringham and Beringer (1998. Directional stimulus–response compatibility: a test of three alternative principles. Ergonomics, 41(6), 864–880) Visual Field principle and an extension of this principle for rotary controls (Hoffmann and Chan (2013). The Worringham and Beringer ‘visual field’ principle for rotary controls. Ergonomics, 56(10), 1620–1624). The initial indicator position (12, 3, 6 and 9 o'clock) had a major effect on control/display stereotype strength for many of the six controls tested. Best display/control arrangements are listed for each of the different control types (rotational and translational) and for the planes on which they are mounted. Data have application where a circular display is used due to limited display panel space and applies to space-craft, robotics operators, hospital equipment and home appliances.     

Effects of spatial luminance nonuniformities on visual-task performance and subjective uniformity

The objectives of the experiment described in the paper were the determination of the effects of nonuniformities on operator performance and perception, and the validation of current recommended standards. Subjects performed two tasks in the presence of nonuniformities: an objective visual search task, and a subjective magnitude-estimation task for the determination of perceived uniformity. The results indicated that the nonuniformities did not appreciably affect search performance, and that current recommendations are appropriate, although the magnitude-estimation task results indicated that the subjects were sensitive to the nonuniformities. The subjective impressions of perceived uniformity results follow the contrast threshold function of the visual system.     

分数傅立叶全息图的算法研究及系统实现

将分数傅里叶变换引入到全息图的计算中,提出一种分数傅立叶变换产生计算全息图的方法,并利用拆卸的投影装置搭建出以空间光调制器DMD为核心的全息显示光学系统并获得了分数傅里叶变换计算全息图在该系统下的全息显示效果及计算机模拟效果。     

Vacuum fluorescent displays for automotive applications

Vacuum fluorescent displays are now widely used in automobiles. This paper describes the various technical requirements for their automotive application. Although VFDs originated in the mature technology of electron tubes, continous development such as introducing thin film technology, thick film technology by photolithography and new phosphor materials, will create a breakthrough for a new generation of VFDs. The current status of the VFD product adopting new technologies and the future trends are presented. In the near future meanwhile, flat panel graphic displays in full colour are expected for practical application.     

三维立体显示综述

按基本工作原理是否为双目视差将三维立体显示分为两大类。基于双目视差原理的三维立体显示主要有眼镜/头盔式立体显示和光栅式自由立体显示,这类三维立体显示的技术相对成熟并有相应产品;非基于双目视差原理的三维立体显示主要有全息立体显示、集成成像立体显示和体显示等,这类三维立体显示的技术较不成熟,大多没有相应产品。对这些三维立体显示的器件结构、工作原理以及各自的特性进行了阐述。