User manual PHILIPS 420WN6QS

[. . . ] Manual file:///D|/My%20Documents/dfu/420WN6/english/420wn6/MANUAL. HTM2005-11-07 12:43:09 PM Safety & Troubleshooting Safety and Troubleshooting Information Safety Precautions and Maintenance · FAQs · Troubleshooting · Regulatory Information · Other Related Information Safety precautions and maintenance WARNING: Use of controls, adjustments or procedures other than those specified in this documentation may result in exposure to shock, electrical hazards and/or mechanical hazards. Read and follow these instructions when connecting and using your computer monitor: q q q q q q q q q q q q Unplug the monitor if you are not going to use it for an extensive period of time. Unplug the monitor if you need to clean it with a slightly damp cloth. The screen many be wiped with a dry cloth when the power is off. However, never use alcohol, solvents or ammonia-based liquids. [. . . ] When two polarized filters are arranged vertically on a polarized light pole, the light that passes through the upper polarized panel is turned 90 degrees along with the spiral structure of the liquid crystal molecules and goes through the polarized filter at the bottom. When impressed with voltage, liquid crystal molecules are arranged vertically from the original spiral structure and the direction of the light is not turned through 90 degrees. In this case, light that comes through the top polarized panel may not go through the polarized panel at the bottom. Q: What are the advantages of TFT LCD compared with CRT?A: In a CRT monitor, a gun shoots electrons and general light by colliding polarized electrons on fluorescent glass. Therefore, CRT monitors basically operate with an analog RGB signal. A TFT LCD monitor is a device that displays an input image by operating a liquid crystal panel. The TFT has a fundamentally different structure than a CRT: Each cell has an active matrix structure and independent active elements. A TFT LCD has two glass panels and the space between them is filled with liquid file:///D|/My%20Documents/dfu/420WN6/english/420wn6/SAFETY/SAF_FAQ. HTM (7 of 9)2005-11-07 12:44:34 PM FAQs (Frequently Asked Questions) crystal. When each cell is connected with electrodes and impressed with voltage, the molecular structure of the liquid crystal is altered and controls the amount of inlet lighting to display images. A TFT LCD has several advantages over a CRT, since it can be very thin and no flickering occurs because it does not use the scanning method. Q: Why is vertical frequency of 60Hz optimal for an LCD monitor?A: Unlike a CDT monitor, the TFT LCD panel has a fixed resolution. For example, an XGA monitor has 1024x3 (R, G, B) x 768 pixels and a higher resolution may not be available without additional software processing. The panel is designed to optimize the display for a 65MHz dot clock, one of the standards for XGA displays. Since the vertical/horizontal frequency for this dot clock is 60Hz/48kHz, the optimum frequency for this monitor is 60Hz. Q: What kind of wide-angle technology is available?A: The TFT LCD panel is an element that controls/displays the inlet of a backlight using the dual-refraction of a liquid crystal. Using the property that the projection of inlet light refracts toward the major axis of the liquid element, it controls the direction of inlet light and displays it. Since the refraction ratio of inlet light on liquid crystal varies with the inlet angle of the light, the viewing angle of a TFT is much narrower than that of a CDT. Usually, the viewing angle refers to the point where the contrast ration is 10. Many ways to widen the viewing angle are currently being developed and the most common approach is to use a wide viewing angle film, which widens the viewing angle by varying the refraction ratio. IPS (In Plane Switching) or MVA (Multi Vertical Aligned) is also used to give a wider viewing angle. Q: Why is there no flicker on an LCD Monitor?A: Technically speaking, LCDs do flicker, but the cause of the phenomenon is different from that of a CRT monitor -- and it has no impact of the ease of viewing. Flickering in an LCD monitor relates to usually undetectable luminance caused by the difference between positive and negative voltage. [. . . ] box 2687Santiago de Chile Phone: (02)-730 2000 Fax : (02)-777 6730 COLOMBIA Industrias Philips de Colombia S. A. -Division de Servicio CARRERA 15 Nr. 104-33 Bogota, Colombia Phone:(01)-8000 111001 (toll free) Fax : (01)-619-4300/619-4104 MEXICO Consumer Information Centre Norte 45 No. 669 Col. Industrial Vallejo C. P. 02300, -Mexico, D. F. Phone: (05)-3687788 / 9180050462 Fax : (05)-7284272 PARAGUAY Av. [. . . ]