<Li> Polarizing filter film with a horizontal axis to block / pass light . </Li> <Li> Reflective surface to send light back to viewer . (In a backlit LCD, this layer is replaced or complemented with a light source .) </Li> <P> A liquid - crystal display (LCD) is a flat - panel display or other electronically modulated optical device that uses the light - modulating properties of liquid crystals . Liquid crystals do not emit light directly, instead using a backlight or reflector to produce images in colour or monochrome . LCDs are available to display arbitrary images (as in a general - purpose computer display) or fixed images with low information content, which can be displayed or hidden, such as preset words, digits, and 7 - segment displays, as in a digital clock . They use the same basic technology, except that arbitrary images are made up of a large number of small pixels, while other displays have larger elements . </P> <P> LCDs are used in a wide range of applications including LCD televisions, computer monitors, instrument panels, aircraft cockpit displays, and indoor and outdoor signage . Small LCD screens are common in portable consumer devices such as digital cameras, watches, calculators, and mobile telephones, including smartphones . LCD screens are also used on consumer electronics products such as DVD players, video game devices and clocks . LCD screens have replaced heavy, bulky cathode ray tube (CRT) displays in nearly all applications . LCD screens are available in a wider range of screen sizes than CRT and plasma displays, with LCD screens available in sizes ranging from tiny digital watches to huge, big - screen television sets . </P>

What is the meaning of lcd in computer