Content deleted Content added
added info |
grammar |
||
Line 12:
| Reflective surface to send light back to viewer. (In a backlit LCD, this layer is replaced or complemented with a light source.)}}]]
A '''liquid-crystal display''' ('''LCD''') is a [[flat-panel display]] or other [[Electro-optic modulator|electronically modulated optical device]] that uses the light-modulating properties of [[liquid crystal]]s combined with [[polarizer]]s. Liquid crystals do not emit light directly<ref>Ulrich, Lawrence (2020). [https://spectrum.ieee.org/cars-that-think/transportation/sensors/boschs-smart-virtual-visor-tracks-sun "Bosch's smart visual visor tracks sun".] {{Webarchive|url=https://web.archive.org/web/20210301071847/https://spectrum.ieee.org/cars-that-think/transportation/sensors/boschs-smart-virtual-visor-tracks-sun |date=March 1, 2021 }} [[IEEE Spectrum]], January 29, 2020. Retrieved March 17, 2020.</ref> but instead use a [[backlight]] or [[Reflector (photography)|reflector]] to produce images in color or [[Monochrome monitor|monochrome]].<ref>{{cite web|url=http://www.merriam-webster.com/dictionary/lcd|title=Definition of LCD|website=Merriam-Webster.com|access-date=February 15, 2015|archive-date=February 25, 2021|archive-url=https://web.archive.org/web/20210225191614/https://www.merriam-webster.com/dictionary/LCD|url-status=live}}</ref> 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: preset words, digits, and [[seven-segment display]]s (as in a digital clock) are all examples of devices with these displays. They use the same basic technology, except that arbitrary images are made from a matrix of small [[pixel]]s, while other displays have larger elements. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. For example, a character positive LCD with a backlight will have black lettering on a background that is the color of the backlight, and a character negative LCD will have a black background with the letters being of the same color as the backlight. White-on-blue LCDs use a blue polarizer
LCDs are used in a wide range of applications, including [[LCD television]]s, [[computer monitor]]s, [[Dashboard|instrument panels]], [[flight instruments|aircraft cockpit displays]], and indoor and outdoor signage. Small LCD screens are common in [[LCD projector]]s and portable consumer devices such as [[digital camera]]s, [[watch]]es, [[calculator]]s, and [[Mobile phone|mobile telephones]], including [[smartphone]]s. LCD screens have replaced heavy, bulky and less energy-efficient [[cathode-ray tube]] (CRT) displays in nearly all applications. The [[phosphor]]s used in CRTs make them vulnerable to [[Screen burn-in|image burn-in]] when a static image is displayed on a screen for a long time, e.g., the table frame for an airline flight schedule on an indoor sign. LCDs do not have this weakness, but are still susceptible to [[image persistence]].<ref name=Fujitsu>{{cite web|title=LCD Image Persistence |url=http://uk.ts.fujitsu.com/rl/servicesupport/techsupport/Diagscript/monitor/ImagePersistence.htm |work=Fujitsu technical support |publisher=Fujitsu |access-date=December 11, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20120423014323/http://uk.ts.fujitsu.com/rl/servicesupport/techsupport/Diagscript/monitor/ImagePersistence.htm |archive-date=April 23, 2012}}</ref>
| |||