Philips 190CW7 user manual LCD Panel Technology, What is a Liquid Crystal Display?

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FAQs (Frequently Asked Questions)

LCD Panel Technology

Q:What is a Liquid Crystal Display?

A:A Liquid Crystal Display (LCD) is an optical device that is commonly used to display ASCII characters and images on digital items such as watches, calculators, portable game consoles, etc. LCD is the technology used for displays in notebooks and other small computers. Like light-emitting diode and gas-plasma technologies, LCD allows displays to be much thinner than cathode ray tube (CRT) technology. LCD consumes much less power than LED and gas-displays because it works on the principle of blocking light rather than emitting it.

Q:What differentiates passive matrix LCDs from active matrix LCDs?

A:An LCD is made with either a passive matrix or an active matrix display grid. An active matrix has a transistor located at each pixel intersection, requiring less current to control the luminance of a pixel. For this reason, the current in an active matrix display can be switched on and off more frequently, improving the screen refresh time (your mouse pointer will appear to move more smoothly across the screen, for example). The passive matrix LCD has a grid of conductors with pixels located at each intersection in the grid.

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 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

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Contents Philips LCD Monitor Electronic User’s Manual Safety precautions and maintenance Safety and Troubleshooting InformationMaintenance OperationReturn to TOP ServiceGeneral FAQs FAQs Frequently Asked QuestionsWhat if I get lost when I am making monitor adjustments? How do I adjust the resolution?What is the Auto function? What does the Refresh Rate mean for LCD?How should I clean the LCD surface? QCan I change the color setting of my monitor?Will the LCD screen be resistant to scratches? What is the FPadjust program on the CD-ROM? Screen AdjustmentsCan the Philips LCD Monitor be mounted on the wall? How do LCDs compare to CRTs in terms of radiation?What is a USB hub ? What is USB Universal Serial Bus?Compatibility with other Peripherals Are Philips LCD monitors Plug-and-Play?What is a Liquid Crystal Display? LCD Panel TechnologyWhat are the advantages of TFT LCD compared with CRT? Ergonomics, Ecology and Safety Standards Why is there no flicker on an LCD Monitor?What is the CE mark? Does the LCD monitor conform to general safety standards? Troubleshooting Vertical flicker appears Page Regulatory Information CE Declaration of Conformity Federal Communications Commission FCC Notice U.S. Only FCC Declaration of Conformity EN 55022 Compliance Czech Republic Only Varning Varoitus End-of-Life Disposal How to connect a plug Other Related Information Information for Users in the U. SInformation for Users outside the U.S About This Manual About This GuideNotational Descriptions Return to TOP Product Information Scanning Resolution & Preset Modes Automatic Power Saving Pin Assignment Product Views Return to TOP Philips Pixel Defect Policy Model Black DOT Defects Acceptable Level Installing Your LCD Monitor Rear View More about FPsetup4.3.exe Connecting to Your PC Accessory PackConnecting to Your PC Connecting to Your PC Return to TOP Remove the Base Condition BaseReturn to TOP Your LCD Monitor Getting StartedFor Windows Me Return to TOP North America Canada USA Customer Care & WarrantyOn-Screen Display Description of the On Screen DisplayOSD Tree On-Screen Display Page Return to TOP Page Thank you for purchasing this Philips monitor Your Philips F1rst Choice WarrantyJust a click away Just a phone call away Page United Kingdom 0207 949 F1rst Choice Contact InformationYour Guarantee in Central and Eastern Europe Just a click away Just a phone call away Belarus Consumer Information CentersBulgaria Czech RepublicHungary EstoniaLatvia LithuaniaSlovenia SlovakiaPoland RussiaAntilles UkraineArgentina BrasilMexico ColombiaParaguay PeruVenezuela UruguayCanada AustraliaBangladesh NEW ZealandChina Hong KongIndonesia IndiaMalaysia KoreaPakistan PhilippinesTaiwan SingaporeThailand MoroccoDubai South AfricaYour International Guarantee Page Your Philips F1rst Choice WarrantyUSA Limited Warranty Computer MonitorClick here to access the Warranty Registration Card Before Requesting Service To GET Warranty Service in Canada Just a phone call away Active matrix GlossaryAmorphous silicon a-Si Aspect ratioBrightness Color temperatureCCFLcold cathode fluorescent light ChromaticityDigital Visual Interface DVI Contrast ratioGamma IPS In Plane SwitchingGrayscale HueLiquid crystal LCD liquid crystal displayLuminance NitPixel PolarizerRefresh rate USB or Universal Serial Bus TFTthin film transistorDevice Upstream Vertical refresh rateDownload and Print Installing Your LCD monitor driverDownload instructions Printing instructionsTo install FPadjust Program Installing FPadjust ProgramReturn to TOP
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