Philips 200p7 User Manual

Also see for 200P7: Quick start guide E-manual E-manual User manual

Contents

FAQs (Frequently Asked Questions)crystal. When each cell is connected with electrodes and impressed with voltage, themolecular structure of the liquid crystal is altered and controls the amount of inletlighting to display images. A TFT LCD has several advantages over a CRT, since itcan be very thin and no flickering occurs because it does not use the scanningmethod.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, anXGA monitor has 1024x3 (R, G, B) x 768 pixels and a higher resolution may not beavailable without additional software processing. The panel is designed to optimizethe display for a 65MHz dot clock, one of the standards for XGA displays. Since thevertical/horizontal frequency for this dot clock is 60Hz/48kHz, the optimum frequencyfor this monitor is 60Hz.Q: What kind of wide-angle technology is available? How does it work?A: The TFT LCD panel is an element that controls/displays the inlet of a backlightusing the dual-refraction of a liquid crystal. Using the property that the projection ofinlet light refracts toward the major axis of the liquid element, it controls the directionof inlet light and displays it. Since the refraction ratio of inlet light on liquid crystalvaries with the inlet angle of the light, the viewing angle of a TFT is much narrowerthan that of a CDT. Usually, the viewing angle refers to the point where the contrastration is 10. Many ways to widen the viewing angle are currently being developed andthe most common approach is to use a wide viewing angle film, which widens theviewing angle by varying the refraction ratio. IPS (In Plane Switching) or MVA (MultiVertical 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 isdifferent 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 thedifference between positive and negative voltage. On the other hand, CRT flickeringthat can irritate the human eye occurs when the on/off action of the fluorescent objectbecomes visible. Since the reaction speed of liquid crystal in an LCD panel is muchslower, this troublesome form of flickering is not present in an LCD display.Q: Why is an LCD monitor virtually low of Electro Magnetic Interference?A: Unlike a CRT, an LCD monitor does not have key parts that generate ElectroMagnetic Interference, especially magnetic fields. Also, since an LCD display utilizesrelatively low power, its power supply is extremely quiet.RETURN TO TOP OF THE PAGEfile:///D|/My%20Documents/dfu/200P7/english/200p7/safety/saf_faq.htm (7 of 8)2006-12-11 1:16:19 PM