Current Japanese digital signage is generally the closed system which is based on the verticalization model than WWW. The conventional digital signage systems have functioned well mainly because they used small amounts of large-sized display by comparing with consumer mobile devices.
However , an open platform will be desirable since the target will be expanded to a variety of devices such as a tablet or smart-phone. The conventional closed system is high-performance, but very application specific. Therefore, if that characteristic is followed, a great deal of cost is necessary for the support of a variety of devices. Furthermore, the long tail market is hard to match a closed system.
We think that the Web base system has the advantage in terms of cost reduction by the following factors to solve these problems.
If, by web based architecture, the new digital signage systems can get more extensive information articulacy than current ones, we can expect that they can possess the ability that can support adaptation to circumstances for an unexpected disaster.
On the other hand, the current Web technology hasn't enough ability for anti-disaster. We pointed this out at The Future of Offline Web App Workshop held on last November. And we pointed out too that the reinforcement of the processing capacity of the map information was particularly necessary. And we are proposing the standardization of the technology to solve it in SVG WG.
In signage, it may be said that the map information is the most important representation style at the time of a disaster. Therefore, we are convinced that our suggestion about the map is the element which is indispensable in signage.
In addition, the use case that the personal mobile devices such as smartphones receive disaster relief information from a large-sized fixed public digital signage when a cell-phone line has gone down is assumed. At this time, a commonized and open data format will be effective too.
How can it support the following functions and specifications that current digital signage has? In addition, most of these will be strongly related with arguments in Web App WG.