LCD Brightness & Definition
LCD, liquid crystal display, refers to displays on watches, computer screens and cell phones. LCD is measured in terms of brightness and contrast.
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History
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LCD is a technology developed in 1963 at the David Sarnoff Research Center in Princeton, New Jersey. Liquid crystals, which are rod-shaped molecules, flow between glass panels and polarizing filters. The way the filters and panels are set up determines how light passes through and is viewed. LCD watches became popular in the 1970s and in the 1990s, color LCDs became popular in laptop computers.
Categories
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LCDs come in two main categories. The passive category features monochrome LCDs, which contain only the color black. They are used for readings on printers and appliances. Active displays contain color LCDs. They are used for TVs, computers and cell phones.
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Features
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The appearance of color and clarity from the use of LCDs varies by several factors. Contrast ratios and brightness levels are two of these. Contrast ratios are listed on the specs of electronics purchased in the form of a number such as 500:1 or 1000:1. The higher the contrast ratio is, the more detailed the picture or image is. The brightness of an item also is listed on the specs in terms of nits, which equals one candela per square meter (cd/m2). The brightness listed on the specs may say 500 cd/m2. As technology progresses, brightness and contrast levels continue to increase.
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