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FAQs (Frequently Asked Questions) 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 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? How does it work? 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? file:///C|/Documents and Settings/effie.chen/桌面/Philips/ENGLISH/190EW8/safety/saf_faq.htm (6 of 7)96/6/5 下午04:25:09
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FAQ (Često postavljana pitanja) umetnutog osvjetljenja za prikaz slika. TFT LCD ima nekoliko prednosti nad katodnom cijevi, budući da može biti jako tanak te ne dolazi do promjene svjetla i tame na zaslonu, jer ne koristi metodu skeniranja. P: Zašto je vertikalna frekvencija od 60 Hz optimalna za LCD monitor? O: Za razliku od monitora s katodnom cijevi, TFT LCD zaslon ima fiksnu rezoluciju. Na primjer, XGA monitor ima 1024 x 3 (R, G, B) x 768 piksela te veća rezolucija možda neće biti dostupna bez dodatne softverske obrade. Zaslon je dizajniran da optimizira prikaz za ritam točaka od 65 MHz, jedan od standardnih za XGA zaslone. Budući da je vertikalna/horizontalna frekvencija za ovaj ritam točaka 60 Hz/48 kHz, optimalna frekvencija za ovaj monitor je 60 Hz. P: Koja je vrsta tehnologije širokog kuta dostupna? Kako funkcionira? O: TFT LCD zaslon je element koji kontrolira /prikazuje umetanje pozadinskog svjetla pomoću dvostruke-refrakcije tekućih kristala. Pomoću karakteristike da se projekcija umetnutog svjetla lomi prema glavnoj osi tekućeg elementa, kontrolira smjer umetnutog svjetla i prikazuje ga. Budući da se omjer refrakcije umetnutog svjetla na tekuće kristale razlikuje s umetnutim kutom svjetla, kuti gledanja TFT-a je puno uži od onoga katodne cijevi. Obično se kut gledanja odnosi na točku gdje je omjer kontrasta Trenutno se razvija mnogo načina proširivanja kuta gledanja, a najuobičajeniji pristup je koristiti film za širokokutno gledanje koji proširuje kut gledanja mijenjanjem omjera refrakcije. Za davanje šireg kuta gledanja koriste se i IPS (In Plane Switching (Prebacivanje u ravnini)) ili MVA (Multi Vertical Aligned (Višestruko vertikalno redanje)). P: Zašto na LCD monitoru nema promjene svjetla i tame? O: Tehnički govoreći, na LCD zaslonima dolazi do promjene svjetla i tame, ali je uzrok ovog fenomena različit od onog kod monitora s katodnom cijevi - te nema utjecaja na udobnost gledanja. Promjena svjetla i tame na LCD monitoru vezana je obično uz neprimjetno osvjetljenje uzrokovano razlikom između pozitivnog i negativnog napona. S druge strane, promjena svjetla i tame na monitoru s katodnom cijevi može iritirati ljudsko oko kad akcija uključivanja/isključivanja fluorescentnog objekta postane vidljiva. Budući da je brzina reakcije tekućeg kristala u LCD zaslonu puno sporija, ovaj zamoran oblik promjene svjetla i tame nije prisutan na LCD file:///C|/Documents%20and%20Settings/F3100594/%AE%E0%AD%B1/PHILIPS%20230E1-081226/lcd/manual/CROATIAN/PRODUCT/safety/SAF_FAQ.HTM(7 of 9) [2008/12/27 下午06:56:08]