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| liquid crystal display ： FOLDOC |
liquid crystal display
(LCD) An electro-optical device used to display digits, characters or images, commonly used in digital watches, calculators, and portable computers.
The heart of the liquid crystal display is a piece of {liquid crystal} material placed between a pair of transparent {electrodes}. The liquid crystal changes the phase of the light passing through it and this phase change can be controlled by the voltage applied between the electrodes. If such a unit is placed between a pair of {plane polariser} plates then light can pass through it only if the correct voltage is applied. Liquid crystal displays are formed by integrating a number of such cells, or more usually, by using a single liquid crystal plate and a pattern of electrodes.
The simplest kind of liquid crystal displays, those used in digital watches and calculators, contain a common electrode plane covering one side and a pattern of electrodes on the other. These electrodes can be individually controlled to produce
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