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Early [[LCD]]s had strikingly narrow [[viewing cone]]s, a situation that has been improved with current technology.
Narrow [[viewing cone]]s of some types of displays have also been used to bring a measure of [[security]] in businesses, where employees handle [[privacy|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 this purpose.
==LEDs==
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