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This study investigates the visual angle threshold value for the recognition of Chinese characters displayed on the optical head-mounted display. As optical head-mounted displays are becoming increasingly popular in various fields, character legibility has become an important topic for research. In this study, a legibility test was conducted by randomly displaying characters on the optical head-mounted display. The characteristics that were tested included the number of strokes, components and usage frequency rankings. The visual angle threshold value of each character was recorded and analysed. The results indicate that Chinese characters with more strokes, more components and lower usage frequency have a larger visual angle threshold value than characters with fewer strokes, fewer components and higher frequency. The number of strokes and usage frequency rankings were inputted into a regression model to predict the visual angle threshold value for character recognition (R2 = 0.72; Adj-R2 = 0.71). The regression analyses revealed that the foregoing inputs increased the visual angle threshold value. These findings provide a practical reference for the display of Chinese characters on optical head-mounted displays. [ABSTRACT FROM AUTHOR]

This study characterizes safety prequalification surveys currently in use in the construction industry to identify approaches that include leading indicators of worker safety performance. We collected prequalification surveys available in the public domain from internet searches, construction company websites, published literature, and construction industry partners. We utilized a conceptual framework, based on safety theory and best practices, to categorize survey questions. Fifty-two prequalification surveys were identified containing 112 unique questions. Most included questions related to lagging indicators (83 percent), safety management leadership (75 percent), and worker training (60 percent). Safety management system elements such as hazard prevention and control, program evaluation and improvement, and coordination and communication were notably absent in 90 percent of the surveys. There was little consistency in the surveys available concerning leading indicators of safety. Only a small number of surveys currently in use incorporate all the elements of best practices associated with robust safety management systems. [ABSTRACT FROM AUTHOR]

Color sequential transmissive and reflective projection displays using a vertical field switching (VFS) polymer-stabilized blue phase liquid crystal (BPLC) are proposed. The VFS-BPLC exhibits submillisecond response time which is useful for suppressing color breakup, hysteresis-free for accurate grayscale control, high optical efficiency, and low operation voltage. [ABSTRACT FROM AUTHOR]

Transmittance of conventional LCDs, which are not suitable for application of transparent displays, is limited by its fixed color gamut. A new structure of transparent display was developed to freely control the color gamut for tuning the transmittance. Its sub-pixel was separated into two parts, colored & white, in order to control the transmittance of each part independently. The maximum transmittance could increase more than twice of original design. A vending machine with the transparent display has been demonstrated. People can see goods, get its information and interact with special program at the same time through touch with reasonable sense of space. [ABSTRACT FROM AUTHOR]

We report a new polymer-stabilized blue-phase liquid crystal display with vertical field switching (VFS) and oblique incident backlight. This VFS mode offers several attractive features, such as low operation voltage, high transmittance, submillisecond response time, and negligible hysteresis and residual birefringence. [ABSTRACT FROM AUTHOR]

This study characterizes safety prequalification surveys currently in use in the construction industry to identify approaches that include leading indicators of worker safety performance. We collected prequalification surveys available in the public domain from internet searches, construction company websites, published literature, and construction industry partners. We utilized a conceptual framework, based on safety theory and best practices, to categorize survey questions. Fifty-two prequalification surveys were identified containing 112 unique questions. Most included questions related to lagging indicators (83 percent), safety management leadership (75 percent), and worker training (60 percent). Safety management system elements such as hazard prevention and control, program evaluation and improvement, and coordination and communication were notably absent in 90 percent of the surveys. There was little consistency in the surveys available concerning leading indicators of safety. Only a small number of surveys currently in use incorporate all the elements of best practices associated with robust safety management systems.