Large-format Display Research Articles

Analysis of irradiation in OptiTouch system with optical detection

As part of the research and development project, a multi-touch multimedia system was implemented, working exclusively on the basis of optical technologies. The model of device with a diagonal of 42” was developed and made with 4K TV image technology and simultaneous detection in near infrared. The control of individual system modules was carried out on RaspberryPi microcomputers without typical operating system. The functionality of a conventional large-format display with unlimited multi-touch, QR code scanner, and a document scanner has been achieved in one housing. Luminance distribution tests were carried out in accordance with ANSI requirements and infrared radiation for detection work.

Broadband Enhancement of Anti-reflectivity for a High Angle of Incidence Using Nanocone Geometry.

The broadband antireflective (AR) effect for wide incident angles has a significant effect on the photoconversion efficiency of photovoltaics and visibility of large-format display panels. The fabrication of surface nanostructures has continued to attract research interest as an effective way to provide such optical performance. However, the effects of different nanostructure geometries are not fully understood, especially for wide-angle AR effects. In this work, we conduct a systematic analysis of the effect of periodic nanostructures such as nanocones (NCs) and inverted nanocones (INCs) on anti-reflectivity at high angles of incidence (AOIs) in terms of light scattering, guided-mode resonance (GMR), and internal reflections. NCs provide good coupling of light scattering and GMR because of their protruding geometry; hence, reduced reflectance can be obtained in the short wavelength region. Further, NCs exhibit relatively weaker GMR intensities and internal reflections, resulting in low reflectance in the long wavelength region. Therefore, NCs offer a superior broadband AR effect for high AOIs compared with INCs. Based on this analysis, we demonstrate an extremely low average reflectance (5.4%) compared to that of the bare substrate (34.7%) for the entire visible range at an AOI of 75° by fabricating NCs on both sides of the substrate.

Energy band offsets of dielectrics on InGaZnO4

Thin-film transistors (TFTs) with channels made of hydrogenated amorphous silicon (a-Si:H) and polycrystalline silicon (poly-Si) are used extensively in the display industry. Amorphous silicon continues to dominate large-format display technology, but a-Si:H has a low electron mobility, μ ∼ 1 cm2/V s. Transparent, conducting metal-oxide materials such as Indium-Gallium-Zinc Oxide (IGZO) have demonstrated electron mobilities of 10–50 cm2/V s and are candidates to replace a-Si:H for TFT backplane technologies. The device performance depends strongly on the type of band alignment of the gate dielectric with the semiconductor channel material and on the band offsets. The factors that determine the conduction and valence band offsets for a given material system are not well understood. Predictions based on various models have historically been unreliable and band offset values must be determined experimentally. This paper provides experimental band offset values for a number of gate dielectrics on IGZO for next generation TFTs. The relationship between band offset and interface quality, as demonstrated experimentally and by previously reported results, is also explained. The literature shows significant variations in reported band offsets and the reasons for these differences are evaluated. The biggest contributor to conduction band offsets is the variation in the bandgap of the dielectrics due to differences in measurement protocols and stoichiometry resulting from different deposition methods, chemistry, and contamination. We have investigated the influence of valence band offset values of strain, defects/vacancies, stoichiometry, chemical bonding, and contamination on IGZO/dielectric heterojunctions. These measurements provide data needed to further develop a predictive theory of band offsets.

The Effect of Font Characteristics on Large Format Display

Objective: To assess the legibility of a large set of existing large format display fonts.
 Background: The enormous selection of fonts allows for creative design; however, while there has been a lot of research on print and computer font legibility, only a limited number of large format display font studies have been conducted.
 Method: Sixty-four subjects from 19-87 years of age viewed 64 displays using 33 fonts shown on a computer monitor. Viewing began at a very small size, which grew larger to simulate a driver or pedestrian approaching a sign. Subjects attempted to read the displays at the smallest possible size. Threshold legibility was determined for each font.
 Results and Conclusions: Font selection can make a very big difference in the distance at which a display can be read; however, there are many fonts that have equivalent legibility. Case can sometimes, but not always, have a large impact on display legibility, with uppercase often performing significantly better than lowercase. The choice of serif versus sans-serif alone does not have an important effect on display legibility. Age impaired sign reading ability, but not until the participants were over sixty. Finally, fonts that share a family name (e.g., Times Bold versus Times New Roman) can have dramatically different legibility distances.
 Application: The results of this research can immediately and directly aid letter manufacturers, display designers, and display owners, as they now know how far away a large number of fonts can be read, and the impact of choosing one font style over another.

Effectiveness and Efficiency of Map Symbols for Dynamic Geographic Information Visualization

The quality of dynamic map symbols plays an important role in the representation of spatial-temporal changes. This paper reports an investigation into the quality of dynamic symbols. To assess the quality of such symbols, a set of traffic flow data is used for the production of different kinds of dynamic maps, with focus on four variables, i.e. size, color, frame rate and display format. Two quantitative measures are used for analysis, i.e. deviation and response time. A set of traffic data is used for the production of dynamic maps for evaluation. The experimental results show that the size is more efficient and more effective than color for dynamic maps with the same frame rate and display format. The most efficient and effective color class number is 10 on the large format display such as 1024 × 768 pixels. And the most efficient and effective size class number is 15 on large format display such as 1024 × 768 pixels. The effective frame rate for dynamic map animation is smaller than that of the general animation on the Internet or Quick Time and AVI format video. The most efficient and most effective frame rate is 3 frames per second in the color expression and 6 frames per second in the size expression. In sum, the effective and efficient value of color, size and frame rate on large format display is less than the value on the small format display. These results suggest the frame rate should be reduced on the small format display. It is hoped that the results from this study will be of help in the design of effective and efficient dynamic map symbols for geographical information visualization.

I Sing the Mapboard Electric

In this article, the technical issues involved in transforming the traditional control center into an operations control environment that can be relocated or resized to meet rapid and frequent changes in operational needs are described. Most important, the future operations control center must replicate all the functionality provided by the fixed map board-a complete view of the grid, switch status, tagging, safety documents, and operational notes-on a large-format display. The future operations center thus becomes a virtual control center that can be either expanded or contracted on demand to meet the changing operational needs of the smart distribution grid.

Potential Performance Costs Associated with Large-Format Tiled Displays for Surgical Visualization

Twenty-five participants performed a surgical training task on a large format display created from one projector or by tiling the images from a 4-, or 9-projector array. Utilizing a large-format display consisting of tiled projector images brings the potential benefits of increased display size with the potential threats to performance of inherent visual artifacts. The effect of these artifacts on performance and subjective workload was assessed. Results indicate that while display size did not affect performance on the surgical task, differences in mental workload were observed. Although a global measure of workload indicated that the tiled displays were the least demanding to use, participants reported deploying additional but highly specific cognitive resources when using these same displays. Their resource shifts seemed to involve adjustments to the perceived control gains created by enhanced size and also degraded ability to compare target sizes in the larger display, possibly due to the obscuring effect of tile edges.

Evaluating the Potential of the GeoWall for Geographic Education

This article discusses modern stereoscopic displays for geographic education, focusing on a large-format display—the GeoWall. To evaluate the potential of the GeoWall, geography instructors were asked to express their reactions to images viewed on the GeoWall during a focus group experiment. Instructors overwhelmingly supported using the GeoWall, stressing the 3-D (three-dimensional) realism provided by stereo images and the excitement these images likely would generate for students. Instructors did, however, note a number of limitations of the GeoWall, including the need to create stereo images (e.g., traditional nonstereo photographs cannot easily be converted to stereo), the need to wear special glasses, and the fact that some people cannot see in stereo. In general, it appeared that the GeoWall would be most useful for complex images and tasks.

Tools and Applications for Large-Scale Display Walls

Increased processor and storage capacities have supported the computational sciences, but have simultaneously unleashed a data avalanche on the scientific community. As a result, scientific research is limited by data analysis and visualization capabilities. These new bottlenecks have been the driving motivation behind the Princeton scalable display wall project. To create a scalable and easy-to-use large-format display system for collaborative visualization, the authors have developed various techniques, software tools, and applications.

56.3: High Speed Flatbed Scanner for Large Format Display Manufacturing

AbstractSubstrate sizes in the Flat Panel Display (FPD) industry are constantly rising as manufacturers try to lower manufacturing costs and meet the ever growing demand for larger screens. The current forecast for Generation 7 (Gen 7) Liquid Crystal Display (LCD) mother‐glass format size is that it would exceed 2000 × 2000 mm. This situation poses a serious challenge to equipment manufacturers, and specifically to digital imaging equipment manufacturers, who need to find new methods to move these substrates at high speeds in order to achieve desired throughput levels.The conventional approach of supporting a substrate by a rigid chuck is not desirable since, for these large substrates, the moving mass becomes prohibitively large.A team in Creo Inc. has developed a novel approach where the moving substrate is supported by a lightweight flexible carrier which travels on an air‐bed (as in an “Air‐Hockey” table). Initial test results show that with such approach one could achieve excellent dynamic stability in a compact and lightweight system. Additional benefits include simpler motor design and thermal load management The concept together with test results will be presented.

Color and brightness appearance issues in tiled displays

Large-format displays created by tiling multiple, projected images have been used for decades in flight simulators and entertainment and are commercially available in a variety of forms. More recently, various research organizations have built custom display walls out of commodity projectors to support research in visualization, large-format display, and interaction. In these settings, making the display appear as a single, seamless surface has proven challenging. Where tiles overlap, they create bright seams. The tiles vary in color and brightness, not only from tile to tile, but within each tile. Each projector has a slightly different color gamut, caused by variations in the bulb, color filters, and digital processing (contrast, brightness, and gamma) for the projector. The spatial variation in brightness has two causes. First, the light from a projection system doesn't uniformly illuminate the screen. Second, the light doesn't scatter uniformly out of the front of the screen, making the perceived brightness depend on the viewing angle. In some projectors, the projected light's color also varies across the tile's face, resulting in unwanted tints in the images. I describe what causes these variations and what can be done about them.

Building and using a scalable display wall system

Princeton's scalable display wall project explores building and using a large-format display with commodity components. The prototype system has been operational since March 1998. Our goal is to construct a collaborative space that fully exploits a large-format display system with immersive sound and natural user interfaces. Our prototype system is built with low-cost commodity components: a cluster of PCs, PC graphics accelerators, consumer video and sound equipment, and portable presentation projectors. This approach has the advantages of low cost and of tracking technology well, as high-volume commodity components typically have better price-performance ratios and improve at faster rates than special-purpose hardware. We report our early experiences in building and using the display wall system. In particular, we describe our approach to research challenges in several specific research areas, including seamless tiling, parallel rendering, parallel data visualization, parallel MPEG decoding, layered multiresolution video input, multichannel immersive sound, user interfaces, application tools, and content creation.

Gaze-orchestrated dynamic windows

Consider a large-format display before the user, bearing a multiplicity of “windows,” like little movies, the majority dynamic and in color. There are upwards of 20 windows, say, more than a person can ordinarily absorb at once. Some of the windows come and go, reflecting their nature as direct TV linkages into real-time, real-world events. Others are non-real-time, some dynamic, others static but capable of jumping into motion. Such an ensemble of information inputs reflects the managerial world of the top-level executive of the not too distant electronic future: a world of brevity, fragmentation, variety, above all one of an overwhelming onslaught of events. The multiplicity and simultaneity of such a display situation ordinarily would make coping with it untenable. The intent of the reported research is to introduce order and control, through the creation of a dynamic, gaze-interactive interface. Making the behavior and reactivity of the “windows” contingent upon measured eyemovements - the point-of-regard of the observer - aims both to help the observer to cope with the onslaught of events on the one hand, yet enable on the other hand continuing close contact with that everchanging ensemble. A simulation of such a world is described and demonstrated in the composite medium of computer, videodisc, and video special effects. Eye-tracking technology, integrated with speech and manual inputs, controls the display's visual dynamics, and orchestrates its sound accompaniments. All elements are combined to form a testbed for the conception generally, and to explore the associated human factors and stagecraft.