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User Manual BDL4211x Q: How are LCDs made? A: LCDs are created from two glass plates separated from each other at a distance of a few microns. The plates are filled with liquid crystal and then sealed together. The top plate is colored with an RGB pattern to make the color filter. Polarizers are then glued to both plates. This combination is sometimes called 'glass' or 'cell.' The LCD cell is assembled into a 'module' by adding the backlight, driver electronics and frame. Q: What is polarization? A: Polarization is basically directing light to shine in one direction. Light is electromagnetic waves. Electric and magnetic fields oscillate in a direction perpendicular to the propagation of the light beam. The direction of these fields is called the 'polarization direction'. Normal or non-polarized light has fields in several directions; polarized light has a field in only one direction. 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: 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 and attached, respectively. The TFT drain of each cell is connected to the electrode. The molecular arrangement of liquid crystal elements differs acceding to whether it is impressed with voltage or not. It varies the direction of polarized light and the amount of light by letting it through different arrays of liquid crystal elements. 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.
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FAQ (Često postavljana pitanja) POVRATAK NA VRH STRANICE Tehnologija LCD ploče P: Što je zaslon s tekućim kristalima? O: Zaslon s tekućim kristalima (LCD) je optički uređaj koji se obično koristi za prikaz ASCII znakova i slika na digitalnim uređajima kao što su satovi, kalkulatori, prijenosne konzolne igrice, itd. LCD je tehnologija koja se koristi za prikaze u prijenosnim računalima i ostalim malim računalima. Poput diode koja emitira svjetlo i tehnologija plinske plazme, LCD vam omogućava da zasloni budu puno tanji od tehnologije katodne cijevi (CRT). LCD troši puno manje energije od LED prikaza svjetlećom diodom te plinskog prikaza, jer radi na principu blokiranja svjetla, a ne njegovog emitiranja. P: Koja je razlika između zaslona s tekućim kristalima s pasivnom matricom od onih s aktivnom matricom? O: LCD se pravi s mrežicom na zaslonu s pasivnom ili aktivnom matricom. Aktivna matrica ima tranzistor lociran na svakom sjecištu piksela, zahtijevajući manje struje za kontrolu osvjetljenja piksela. Iz tog se razloga struja na prikazu s aktivnom matricom može češće uključivati i isključivati poboljšavajući vrijeme obnavljanja zaslona (na primjer, činit će se da se pokazivač miša glatko pomiče preko). LCD s pasivnom matricom ima mrežicu vodiča s pikselima lociranima na svakom sjecištu na mrežici. P: Koje su prednosti TFT LCD-a u usporedbi s katodnom cijevi? O: U monitoru s katodnom cijevi, top izbacuje elektrone i opće svjetlo sudaranjem polariziranih elektrona na fluorescentnom staklu. Stoga, monitori s katodnom cijevi u osnovi funkcioniraju s analognim RGB signalom. TFT LCD monitor je uređaj koji prikazuje ulaznu sliku upravljajući pločom s tekućim kristalima. TFT ima potpuno drugačiju strukturu od katodne cijevi: Svaka stanica ima strukturu aktivne matrice i neovisne aktivne elemente. TFT LCD ima dvije staklene ploče, a prostor između njih je ispunjen tekućim kristalima. Kad je svaka stanica spojena s elektrodama i pod naponom, molekularna struktura tekućih kristala se mijenja i kontrolira količinu file:///C|/Documents%20and%20Settings/F3100594/%AE%E0%AD%B1/PHILIPS%20230E1-081226/lcd/manual/CROATIAN/PRODUCT/safety/SAF_FAQ.HTM(6 of 9) [2008/12/27 下午06:56:08]