TouchIT by unknow

Author:unknow
Language: eng
Format: epub
Publisher: Oxford University Press, Incorporated
Published: 2022-07-19T06:53:51+00:00

14.3 Pervasive and Public Displays

Recall from Chapter 2, that Mark Weiser’s vision of ubiquitous computing [416] was based largely around displays from inch scale to yard scale. This has certainly come to pass: in the home, almost every kitchen and media appliance has its own display, not to mention sewing machines, individual heaters, and radiators. In public spaces we see ticker-tape displays at bus stops showing the next bus, touchscreens in railway stations to plan journeys, and vast digital advertising hoardings or town-centre public displays.

Weiser’s inch (3 cm), foot (30 cm), and yard (1 m) sized displays related to the office and home environments, but public displays like departure boards and billboards often exceed these scales. These have been termed (following Weiser’s use of imperial lengths) perch scale (6 m) and beyond [389, 135].

The size of a display is related to the size of the area it inhabits, so it is not surprising that a railway station can support larger displays than a living room. Indeed, Times Square has displays bigger than a block of flats. However, it is a little more complex than that. Any display defines an area over which it can be easily viewed. For example, a phone-sized display is not much use across a room unless it shows something simple but very large, such as the current channel for a set-top box, and if a display subtends more than about 30 degrees you need to start moving your head to see the ends of it, and text and images become distorted by the viewing angle (Figure 14.1).

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