Outline For Social Problems

693 words - 3 pages

Explain TWO (2) types of monitor. Describe in details the quality of LCD monitor/screen.Type of monitorLCD Monitors / ScreenA desktop monitor that uses a liquid crystal display to produce images. These monitors produce sharp, flicker-free images.CRT MonitorsA desktop monitor that contains a cathode-ray tube (CRT). A cathode-ray tube (CRT) is a large, sealed glass tube. CRT Monitors have a much larger footprint than do LCD Monitors that is they take up, ore desk space and thus are not used much nowadays.Quality of LCD monitorThe quality of an LCD monitor or LCD screen depends primarily on its resolution, response time, brightness, dot pitch, and contrast ratio.Resolution: The number of horizontal and vertical pixels in a display device. A higher resolution uses a greater number of pixels and thus provides a smoother, sharper, and clearer image. For example, a monitor that has 1440 x 900 resolution displays up to 1440 pixels per horizontal row and 900 pixels per vertical row, for a total 1296000 pixel to create a screen image.Response time: The response time of an LCD Monitor/Screen is the time in milliseconds (ms) that it takes to turn a pixel on or off. The lower the number, the faster the response time.Brightness: The brightness of an LCD Monitor/Screen is measured in nits. A nit is a unit of visible light intensity equal to one candela (formerly called candlepower) per square meter. The candela is the standard unit of luminous intensity.Dot pitch: Sometimes called pixel pitch. The distance in millimetres between pixels on a display device. The lower the number, the sharper the image.Contrast ratio: Describe the difference in light intensity between the brightest white and darkest black that can be displayed on an LCD Monitor. Higher contrast ratios represent colours better.Dot Matrix printer is one of the examples of Impact Printer. Give FOUR (4) example of document that normally printed by Dot Matrix printer.BillsInvoiceReceiptExamination slipDescribe FIVE (5) input and output options for physically challenged users?Joysticks that you usually associate with video games can also help physically challenged...

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