Carrier transport in solution-processed organic field-effect transistors (OFETs) based ondioctylbenzothienobenzothiophene (C8-BTBT) has been investigated in a wide temperature range from 300 to 10K. The field-effect mobility shows thermally activated behavior whose activation energy becomes smaller with decreasing temperature. The results indicate thathopping transport between isoenergetic localized states becomes dominated in a low temperature regime. Numerical simulation has been carried out to explain the temperature dependence of the mobility using a hopping transport model based on the effective transport energy concept [V. I. Arkhipov, et al., Appl. Phys. Lett. 82 (2003) 3245]. The numerical calculation is in good agreement with the present experimental results.
This paper proposes a Kalman filter based robust restoration method with colored driving source for degraded images. This algorithm aims to achieve high quality image restoration for blur and noise disturbance from the canonical state space models with (i) a state equation composed of the original image, and (ii) an observation equation composed of the original image, blur, and noise. The remarkable feature of the proposed method is realization of high performance image restoration without sacrificing an original image despite simple image restoration using only Kalman filter. We show the effectiveness of the proposed method, which utilized the Kalman filter theory for the proposed canonical state space models with the colored driving source, using numerical results and subjective evaluation results.
It is predicted that a digital signage market will be expanded to about 252,000 million yen in 2020. While a market is expanded, the digital signage which has failed in charming a consumer also exists mostly. The reason why many company have failed in introduction of digital signage is too much focus on technology. Wal-Mart failed to introduce their first digital signage system because of lacking the viewpoint of consumer. They have challenged second digital signage system named Wal-Mart smart network. There are 8 check points in order to lead digital signage introduction to a success based on advanced examples, such as Wal-Mart. We need to plan the location, content and creative, effect verification based on consumer and shopper insight.
Serial type inkjet printer is suitable as a wide-format printer in being made wide by width to print easily. Currently, wide-format inkjet printers are the principal type of printer used for signage. The ink used in signage printers has progressed greatly during more than 10 years recently. Together with the advantages of inkjet technology that enables non-contact printing, the fruits of the ink evolution that began in signage printers are being exploited and their applications are being progressively broadened into new industrial fields. Here, I describe historic development of inkjet ink, which started with water-based ink and progressed through solvent ink to latex ink, culminating in UV curable ink. In addition, I describe the trends in applications of inkjet printers, which have recently been spreading progressively into signage printing and industrial and other uses. Finally, I consider the issues for future development of signage printers and related technology.
Digital Signage has five business models. “Advertisement Signage” is the most famous for the purpose of displaying an advertisement on the display which is installed in a train and a pillar of the station. “Promotion Signage” is used by the POP or a product explanation in the store. “Information Signage” is like a used for departure and arrival guidance in the airport and the stock prices board, various information indication in the office. Other two are “Event Signage” and “Spatial Presentation Signage”. But the projector technology and projection mapping technology has become a hot topic in the last two areas recently. Especially, ultra short throw projector has a feature that the distance to the screen is very short have been utilized in the areas.
We prepared nanocomposite films containing the nanodiamond, which has excellent water-dispersibiliy and high refractive index (2.42). In this study, a water-soluble poly(vinyl alcohol) was used as a matrix. The dispersion state of nanodiamond in a poly(vinyl alcohol) matrix was observed using atomic force microscope (AFM), and the optical properties were investigated. AFM images showed that the nanodiamonds were highly dispersed without recognizable aggregation in the polymer matrix. The resulting nanocomposite film was transparent, and the light scattering was definitely observed. Although the nanodiamond was mainly used in applications based on its mechanical property, this material could also offer the potential applications in optical materials such as transparent screen.
Since their commercialization in 2004, Electronic Paper Displays (EPDs) have gained popularity in electronic reading or e-Reading devices due to their benefits of readability, ultra low power consumption and form factor being light and thin. Much like paper media is used for wider applications other than books or magazines, such as posters, wallpaper, packaging, indicators or labels, we consider there is a large, untapped market for non-e-Reading or “industrial applications” of EPD. As EPDs and connectivity become more affordable in pricing, we expect this market to grow significantly. We explain the industrial application of EPD to the digital signage area, with a focus on “disaster-preparedness” applications, which take advantage of the ultra low power consumption benefit of EPDs and address the social challenges in light of the Great East Japan Earthquake of 2011.
Digital signage is widely distributed nowadays and makes attractive advertisements or effective communicating information possible. Users can retrieve the details of displayed information by smartphones which have been widely distributed, too. However, such retrieval is time-consuming. Moreover, the retrieved information is sometimes wrong. Therefore it is desirable that the details are directly obtained from videos on signage. URLs or QR codes are used for such purpose in case of printed materials, but are not suitable in case of videos because they should continue to be displayed in enough time to be read by smartphones. Then, now we implement a suitable digital watermarking system as the application of smartphone for extracting watermark from videos on signage in real-time. The experimental results report a new information that the application can obtain correct watermarks in approximately 743ms from the optimal visual distance.
A number of studies have been conducted to evaluate the ease of seeing signs in public spaces. Most of these studies have focused on aspects of visibility or attention value, such as figure-ground segregation or difference in brightness between two areas. This study will focus on readability and understandability of the public sign, both of which are important aspects of signs. To recognize objects and scenes, we use previous knowledge as well as perceptual information. Studies on color memory indicate that knowledge of typical colors of objects can help with object identification. Focusing on the visual characteristics and cognitive functions of human beings, we consider the elements of a new ” visibility” in this paper.