A complete illustrated guide to the pc hardware

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.htm (16 of 19) [4/15/1999 6:29:57 AM]An illustrated Guide to Monitors and the Video Systemchoices in screen savers.Also, many programs include a screen saver or two as an extra feature.Someprovide a series of images, such as "celebrity cars," showing movie celebrities with their fancy cars.Use the screen savers.They can spice up day-to-day work.Environmental standardsScreen radiation is a pollutant.There is no concrete evidence that screen radiation can cause illness.However, artificially generated radiation must be unwelcome in our environment.Consequently, industrystandards have been developed for acceptable radiation levels.Since the early nineties, the Swedish MPR-2 standard established limits for monitor electrostatic radiation.Since came the stricter TCO-92.It limits the permitted amount of low level radiation and establishesstandards for electrical and fire safety.TCO means Total Cost of Ownership.Finally, we have TCO-95, which is the strictest standard.Similarly to TCO-92, it also includes regulations onergonomics (including refresh rates), maximum energy consumption, environmentally friendly production andrecycling facilities.The best screens comply with this standard.Screens adhering to the TCO standards aremore expensive.Obviously since they are better screens.The flat TFT screens do not emit any radiation at all and they consume considerably less energy than theradiating screens.This is another indication that TFT may be the standard screen of the future.The VESA DPMS system is an energy saving technology, which includes both screen and video card.Amodern 17 screen consumes about 100 watt in normal use.With DPMS the screen switch to two energysaving modes.First, power consumption drops to 25 watt and finally again drops to 8 watt.LCD screensThe big, heavy traditional monitors will eventually be phased out.They will be replaced by the thin and "soft"LCD (Liquid Crystal Display) screens! It may be a few years before this technology will be dominating, but itis bound to happen.The LCD screens are excellent, and actually they are already available.The LCD screen is flat, since it contains no cathode ray tube (CRT).In stead the screen image is generatedon a flat plastic disk.Here you see a Siemens Nixdorf 3501T.It produces a sharp high resolution image -better than any others I have seen:file:///E|/education/Click & Learn/module7a.htm (17 of 19) [4/15/1999 6:29:57 AM]An illustrated Guide to Monitors and the Video SystemLCD screens are also called "soft" screens, since their images have a softer quality than those fromtraditional CRT monitors.The image does not flicker thus causing less eye strain.People who have becomeaccustomed to these soft images will not return to the traditional monitors.At the same time the LCD screenis by far the most environmentally safe product.These flat screens emit zero radiation, and they consumesignificantly less power than the traditional monitors.Another reason to expect LCD screens to become themonitors of the future.No refresh-rateA big advantage in the LCD screen is that it does not flicker.Traditional CRT monitors flicker all the timewhich is not ideal.Of course the best CRT monitors have a nigh refresh rate (85 Hz or more), which providesa very stable image with no noticeable flicker.But the LCD screen does not flicker at all.They have a refreshrate of 0 Hz!Modern research has shown that a steadily illuminated screen image is a very important element in a goodwork environment.The eye responds to all light impressions, and the brain interprets all light impressionscontinually.When a mediocre monitor flickers, the brain will continually receive superfluous light impressions"noise" to sort out.Thus the brain works permanent overtime interpreting the screen flicker.No wonder thatpeople get tired from watching their monitors.Digital graphics cardsA special graphics card comes with the 3501 screen.It can be used both with traditional monitors and LCDscreens, and you can actually connect to monitors at a time! You save by getting a quality graphics cardincluded in the cost of the LCD screen.The big advantage is that the adapter for the LCD screen is straightdigital.The conventional graphics adapters convert the digital signals to analogue signals, which causessome loss of quality.The digital adapter eliminates these distortions completely, which results in a veryimpressive screen image!Link to Siemens Nixdorf about LCD screens!file:///E|/education/Click & Learn/module7a [ Pobierz całość w formacie PDF ]

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