Refresh rate - the number of times that the image is drawn each second. For example, a VGA monitor produces 256 colours, enough for home use a SuperVGA can produce up to 16.7 million colours, so is ideal for photographic work and video games. Colour depth- the number of colours a monitor can display. Brightness - the luminance of images is measured in cd/m (candela per square metre).
The sharpness of images is affected by dot pitch, the distance between the pixels on the screen, so a dot pitch of 0.28 mm or less will produce a sharp image. Resolution - the clarity of the image depends on the number of pixels (short for picture elements) contained on a display, horizontally and vertically. Screen size - the viewing area is measured diagonally in other words, a 17" screen measures 17 inches from the top left corner to the bottom right. They offer better quality and take up less space, so they are replacing CRTs.
Active-matrix LCDs use TFT (thin film transistor) technology, in which each pixel has its own transistor switch. The crystals block the light in different quantities to create the image. A Liquid Crystal Display is made from flat plates with a liquid crystal solution between them. CRTs are cheap, but they are heavy, can flicker and emit radiation. It has three electron guns (one for each primary colour: red, green and blue) that strike the inside of the screen, which is coated with substances called phosphors, which glow and create colours.
SCREEN READER SOFTWARE IS AN EXAMPLE OF A TV
The Cathode Ray Tube of a monitor is similar to a traditional TV set. Type of display - the choice is between a CRT or an LCD screen. When choosing a monitor, you have to take into account a few basics: Inside the computer, there is a video card which processes images and sends signals to the monitor. CRTs AND LCDs.The screen of a computer is often known as the monitor, or VDU (visual display unit).
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