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Paper posters look set to be replaced by LCD and plasma screens. Advertising-hoarding companies have begun to deploy active billboards on the high street, often enlisting the help of specialists. Because of the cost of replacing the thousands of sites operated by advertising- space suppliers but also because of size limitations on the electronic displays themselves. The biggest issue with a standard LCD lies in the design the backlight. A consumer LCD is almost always mounted horizontally to suit widescreen TV and film content.