LCD displays, by contrast, filter light from a backlight through an array of tiny coloured filters and liquid-crystal shutters.

相比之下，液晶显示技术通过一排微型的彩色过滤器与液晶体检波器来从背光中过滤光源。

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The researchers—from Seoul National University, Act Company and Minuta Technology—used an array of microscale prisms placed on a screen to create a filter that guides light directionally.

首尔国立大学、Act Company 和 Minuta Technology的研究人员利用安置在屏幕上的一个微型棱镜阵列，作为过滤器来定向引导光线。

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At this time of day you need to filter out the red light to take a good photo.

在一天的这个时候，你需要过滤掉红光才能把相照好。

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By passing light from the palimpsest through a filter made up of liquid crystals, the researchers can adjust the wavelengths of the pictures that result by 10 billionths of a metre at a time.

ECONOMIST: The Archimedes palimpsest

Most BlackBerry phones have a flashing light that blinks when an e-mail comes in, and a built-in option to filter alerts so that you only receive them from contacts you prioritise.

BBC: Managing e-mail while on the road

With the addition of a new Louver filter, the ZT Series line delivers improved external light shading, clarity and light transmittance.

ENGADGET: Sixteen new plasma TVs from Panasonic for 2013, none that break into larger classes