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The viewing angle is measured from one direction to the opposite, giving a maximum of 180° for a flat, one-sided screen. Some display devices exhibit different behaviour in horizontal and vertical axis, requiring users and manufacturers to specify maximum usable viewing angles in both directions. Usually the screens are aligned and used to facilitate greater viewing angle in horizontal level, and smaller angle in the vertical level, should the two of them be different in magnitude.
Early [[LCD]]s had strikingly narrow [[viewing
Narrow viewing angle of some types of displays have also been used to bring a measure of [[security]] in businesses, where employees handle private information in the presence of customers, banks being one example. Rectangular filters fitting to the computer monitors have also been sold as accessories for these kind of purposes.
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