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A film-insert injection compression molding process was introduced to encapsulate cholesteric liquid crystal displays with flexible and rigid lens for full protection of displays to replace the currently used time consuming hand lamination technique. For this purpose, a new interchangeable cavity instrumented hot runner mold was designed and constructed. This complex method was carefully optimized...
When reading from an electronic screen, many individuals report symptoms such as tired eyes or eye strain. To minimize these symptoms, a 3× acuity reserve has been suggested, i.e., the minimum print size should be at least 3 times larger than the size of the letters at the reader’s acuity limit. This study evaluated whether the 3× rule is appropriate, or if an alternative relationship between visual...
In many virtual environments, such as those of video games, the scene background moves to give the illusion of movement. In the present study, two experiments were designed to investigate the combined impact of lateral background motion and task difficulty on players’ performance in a target-shooting task. Participants had to perform the task on either the moving or the stationary version of a patterned...
Objective: It is generally assumed that motion in motion images is responsible for increased postural sway as well as for visually induced motion sickness (VIMS). However, this has not yet been tested. To that end, we studied postural sway and VIMS induced by motion and still images. Method: 15 Participants were exposed to motion- and still images in separate sessions. Motion images consisted of video...
The use of colors in visual displays can facilitate visual search and perception, but their use may not be effective without consideration of differences in the interpretation of their connoted meanings between individuals of different occupational backgrounds.This study examined color-concept associations for Hong Kong Chinese students and white-collar workers, and then compared their associations...
Using a ray tracing technique, we investigate the dependence of the moiré effect on the crossing angles between touch screen panels (TSPs) and display panels, the metal grid structures (spacing and width), and metal grid shapes (non-uniform and random grids). Of those design parameters, adjusting the crossing angle (∼45°), reducing the grid width (∼1μm), and employing a random grid in the shape of...
Blue organic light-emitting devices (OLEDs) combing a composite hole transporting layer (c-HTL) and novel homogeneous double emitting layers (DELs) have been fabricated. The c-HTL plays a significant role of rectification in balancing the carriers’ injection concentration which matches well with the DELs structure. The DELs is consisted of two homogeneous hosts, such as 2-methyl-9,10-di(2-naphthyl)...
This paper presents a low-power and simple scan driver with a new output module called as AC–DC type output module. 46 stages of the scan driver are fabricated by integrating In–Zn–O Thin-film transistors (IZO TFTs) with back channel etch (BCE) structure on the glass substrate. Under 100 hours’ test, it is shown that the voltage fluctuation of the output signal can be well suppressed by the proposed...
Minimum angle of resolution (MAR) was measured for the grating which consisted of lines of two colors selected from Red, Green, Blue, White and Black. Method of two alternative forced choice (2AFC) was used where the participants were asked to answer the direction of the color grating of the horizontal or vertical directions. From the measured psychometric function of the ratio of the correct answers,...
Dysprosium doped strontium calcium magnesium di-silicate phosphor namely: SrCaMgSi 2 O 7 :Dy 3+ was prepared by the solid state reaction method. The crystal structure of the prepared phosphor was an akermanite type structure, which belongs to the tetragonal crystallography with space group P42 1 m. From field emission scanning electron microscopy (FESEM), agglomerations...
The effect of 1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) doping on electroluminescent properties of poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine] (poly-TPD) was investigated. A series of organic light-emitting devices (OLEDs) integrated with (i) single-layer poly-TPD, (ii) blended single-layer poly-TPD:TPBi or (iii) bilayer poly-TPD/TPBi were fabricated and characterized. An...
Industrial and academic researches have, in the last twenty years, matured the plasma display panels (PDPs) to the successful product level for commercial flat screen television sets. The sustain driver with resonant operation, converting high dc voltage to ac square-wave voltage with high frequency for strong visible light emission, have great influence on the entire circuit efficiency and cost,...
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