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RETURN TO TOP OF THE PAGE L Linearity The degree to measure the actual location of a pixel on the screen corresponds with its intended location. ( see figure ) Line frequency See Horizontal scanning frequency. Low-emission monitor A monitor that complies with international standards on radiation. See Electromagnetic radiation standards. Low-frequency electric and magnetic fields Alternating fields generated by the deflection yoke. These are subject to increasing attention, notably by governing authorities, the trade and the press. Although there is no scientific evidence that monitor emissions are harmful, much effort has gone into reducing emissions on the principle of better safe than sorry. Currently, there are two areas of interest: very-low frequency (VLF) electric and magnetic fields extending from 2 kHz to 400 kHz, and extreme low frequency (ELF) fields extending from 5 Hz to 2 kHz. See also Electromagnetic radiation standards. RETURN TO TOP OF THE PAGE M Moire effect A fringe pattern arising from the interference between two superimposed line patterns. In a monitor it comes from the interference between the shadow mask pattern and the video information (video moire), and between the shadow mask pattern and the horizontal line pattern (scan moire). It shows itself as wavy patterns on the screen and becomes more noticeable as monitor resolution increases. Since the video signal varies continuously, little can be done about video moire. Scan moire depends on the horizontal scanning frequency and can be alleviated by appropriate choice of frequency. Autoscan (MultiSync) monitors, which operate over a range of scanning frequencies, may sometimes exhibit moire in certain video modes. MPR See Electromagnetic radiation standards. MultiSync monitor See Autoscan monitor. RETURN TO TOP OF THE PAGE N Non-interlaced See Interlaced/non-interlaced. RETURN TO TOP OF THE PAGE O OSD (On Screen Display) The feature that allows an end user to adjust screen performance and parameters of monitors directly through an on-screen instruction window. See CustoMax in CrystalClear section. Overscan The practice in which areas without useful video information are scanned outside the visible screen area in order to make maximum use of the screen for display of active video information. This practice is occasionally necessary because some video cards generate a video pattern that is smaller than the visible screen area, resulting in an image that is smaller (and less legible) than it needs to be. RETURN TO TOP OF THE PAGE P Parallelogram Distortion See Geometric distortion. Phosphor Generic name for the class of substances that exhibit luminescence. To produce a picture on screen, phosphors are deposited on the inner surface of the picture-tube screen and excited into luminescence by the electron beam. Typical examples of phosphors are P22 medium shortpersistence phosphor and EBU high-color-saturation phosphor. Pin-cushion Distortion See Geometric distortion. Pixel Abbreviation for picture element, the smallest element of the picture that can be displayed on the screen. The smaller the pixel size, the better the resolution of the monitor. Pixel size is determined by the size of the electron spot on the screen and not necessarily by the phosphor dot pitch (the size of the triad). Thus, a monitor with a large electron spot covering several triads can exhibit poor resolution even though its dot pitch is small. Pixel frequency The number of pixels that can be written in a video line per second. Pixel rate See pixel frequency Plug-and-Play See DDC. See USB section. RETURN TO TOP OF THE PAGE R Raster The area on screen that electron beam can reach. Refresh rate See Vertical scanning frequency. Resolution The number of pixels that can be displayed on the screen. The resolution is specified as the number of pixels in a line multiplied by the number of horizontal lines. See also video graphic adapter. Rotation function The feature that allows users to adjust the whole screen rotating to be horizontal. Because of the magnetic field of earth, the screen of monitor will be tilt when the screen faces toward the different direction. RETURN TO TOP OF THE PAGE S Screen coatings Anti-Static coatings Due to bombardment by beam electrons, monitor screens become electrically charged when in use. Electrically charged screens surfaces can attract dust particles. An Anti-Static coating is a conductive coating deposited on the screen (or on a glass panel immediately in front of the screen) that conducts away the charge and prevents screen dust build-up. AGAS (Anti-Glare, Anti-Static) coating AGAS is a silica coating applied to the surface of the screen by a spinning and spraying process. It operates by diffusing reflected light to blur images of light sources on the screen. To provide antistatic properties, the coating is impregnated with small conductive particles. ARAS (Anti-Reflection, Anti-Static) coating ARAS is one of the most effective anti-reflec...

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