Philips 200s4 User Manual

Also see for 200P4MG/00: Specifications

Contents

FAQs (Frequently Asked Questions)Q: How does a TFT LCD Panel work?A: On each column and row of the TFT LCD panel, a data source drive and a gate drive areattached, respectively. The TFT drain of each cell is connected to the electrode. Themolecular arrangement of liquid crystal elements differ according to whether it is impressedwith voltage or not. It varies the direction of polarized light and the amount of light by lettingit through different arrays of liquid crystal elements. When two polarized filters are arrangedvertically on a polarized light pole, the light that passes through the upper polarized panel isturned 90 degrees along with the spiral structure of the liquid crystal molecules and goesthrough the polarized filter at the bottom. When impressed with voltage, liquid crystalmolecules are arranged vertically from the original spiral structure and the direction of thelight is not turned through 90 degrees. In this case, light that comes through the toppolarized panel may not go through the polarized panel at the bottom.: What are the advantages of TFT LCD compared with CRT?A: In a CRT monitor, a gun shoots electrons and general light by colliding polarizedelectrons on fluorescent glass. Therefore, CRT monitors basically operate with an analogRGB signal. A TFT LCD monitor is a device that displays an input image by operating aliquid crystal panel. The TFT has a fundamentally different structure than a CRT: Each cellhas an active matrix structure and independent active elements. A TFT LCD has two glasspanels and the space between them is filled with liquid crystal. When each cell is connectedwith electrodes and impressed with voltage, the molecular structure of the liquid crystal isaltered and controls the amount of inlet lighting to display images. A TFT LCD has severaladvantages over a CRT, since it can be very thin and no flickering occurs because it doesnot 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 XGAmonitor has 1024x3 (R, G, B) x 768 pixels and a higher resolution may not be availablewithout additional software processing. The panel is designed to optimize the display for a65MHz dot clock, one of the standards for XGA displays. Since the vertical/horizontalfrequency for this dot clock is 60Hz/48kHz, the optimum frequency for 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 backlight using thedual-refraction of a liquid crystal. Using the property that the projection of inlet light refractstoward the major axis of the liquid element, it controls the direction of inlet light anddisplays it. Since the refraction ratio of inlet light on liquid crystal varies with the inlet angleof the light, the viewing angle of a TFT is much narrower than that of a CDT. Usually, theviewing angle refers to the point where the contrast ration is 10. Many ways to widen theviewing angle are currently being developed and the most common approach is to use awide 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 viewingangle.file:///D|/My%20documents/dfu/J/english/200p4/safety/saf_faq.htm (6 of 8)7/9/2004 12:36:39 PM