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One of the earliest electronic displays is the cathode-ray tube (CRT), which was first demonstrated in 1897 and made commercial in 1922. [1] The CRT consists of an electron gun that forms images by firing electrons onto a phosphor-coated screen. The earliest CRTs were monochrome and were used primarily in oscilloscopes and black and white ...
CRTs use an electron beam, scanning the display, flashing a lit image. If interlacing is used, a single full-resolution image results in two "flashes". The physical properties of the phosphor are responsible for the rise and decay curves. Plasma displays modulate the "on" time of each sub-pixel, similar to DLP.
Digital signage on the side of a building reports stock prices. Dow Jones News Ticker, Times Square Digital signage is a segment of electronic signage.Digital displays use technologies such as LCD, LED, OLED, projection and e-paper to display digital images, video, web pages, weather data, restaurant menus, or text.
February is Black History Month, and there are plenty of opportunities to celebrate. ... Board of Education. 2005 The Niagara Movement: Black Protest Reborn, 1905-2005. 2006 Celebrating Community ...
Related: Black Booksellers Recommend 25 Books to Read During Black History Month Shirley Chisholm Don Hogan Charles/New York Times Co./Getty Images
No matter what month it is, remember: Black history is American history. For the latest content celebrating Black History Month, please visit our Black History Month page, or read more in our ...
A display board, also known as poster board, is a board-shaped material that is rigid and strong enough to stand on its own, and generally used paper or other materials affixed to it. Along with quad charts , display boards were an early form of fast communication developed by the National Weather Service of the United States Department of ...
Black History Month began in 1926 as just a week-long observance, then expanded into a month-long celebration in 1976. ... Hulton Archive - Getty Images. Woodson’s myriad contributions, which ...