The parameters to measure the quality of CRT and LCD display devices
...0 pixels per horizontal inch and 600 pixels per vertical inch, for a total of 480,000 pixels to create a screen image. Standard CRT monitors usually display a maximum of 1600 x 1200 pixels with 800 x 600 as the norm. · Dot pitch: sometimes called pixel pitch, is another measurement of image clarity on a CRT monitor. It is the distance in millimeters between each like-colored pixel on a display. The smaller the distance the sharper the image. .27 millimeters or lower will minimize eye fatigue. Advertisements usually specify a monitor’s dot pitch. · Refresh rate: also called scan rate, is the speed that a monitor redraws the images on the screen. Ideally, the CRT’s refresh rate should be fast enough to maintain a constant, flicker-free image. Refresh rate is the number of times per second the screen is redrawn and is expressed in hertz (Hz). Most people can tolerate a vertical refresh rate of 60 Hz, however, a high quality CRT monitor will provide a vertical refresh rate of at least 75 Hz. This means the image will redraw itself vertically 75 times in a second. · Color Depth: The combination of the display modes supported by your graphics adapter and the color capability of your monitor determine how many colors can be displayed. For example, a display that can operate in SuperVGA (SVGA) mode can display up to 16,777,216 (usually rounded to 16.8 million) colors because it can process a 24-bit-long description of a pixel. With a 24-bit bit depth, 8 bits are dedicated to each of the three additive primary colors -- red, green and blue. Simply put, color bit depth refers to the number of bits used to describe the color of a single pixel. The bit depth determines the number of colors that can be displayed at one time. · Power Consumption: CRTs are somewhat power-hungry, at about 110 watts for a typical display. In a typical home computer setup with a CRT-based display, the monitor accounts for over 80 percent of the electricity used. The parameters to measure the quality of a LCD display device: · Resolution: The quality of an LCD monitor depends primarily on its resolution, which generally is proportional to the size of a mo...