|Medicanvas Slim View Box|
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Medicanvas Slim View Box
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|TFT-LCD, which stands for THIN-FILM-TRANSISTOR LIQUID CRYSTAL DISPLAY, is an active display screen which consists of liquid crystal between a layer of a color filter (at the top of the display) and a glass panel (at the bottom of the display) with a transistor for each pixel (tiny elements that control illumination). The liquid crystals direct light through the polarizing filters that allow a natural background color to show. When liquid crystals are energized, they redirect the light to be absorbed in one of the polarizers, causing the dark appearance of crossed polarizers to show.
TFT-LCD is also known as an "active matrix display" technology that provides a sharper screen display and a broader viewing angle commonly used in laptop computers. This technology consumes much less power because they work on the principle of blocking light rather than emitting it.
Backlighting is used as a technique to make the TFT-LCD easier to read. A cold cathode fluorescent lamp (see CCFL) is commonly used in backlighting. They are mounted along the top and bottom edges of the panel to illuminate the background of the display panel and provide a contrast to the foreground in order to make the LCD appears sharper.
CCFL or COLD CATHODE FLUORESCENT LAMP is a small type of fluorescent lamp used for backlighting TFT-LCD displays. It provides an excellent illumination of about 3,000 to 4,000 cd/m2 at a low current but produces only a very moderate heat. The lamps last for about 20,000 hours. CCFL provides the most efficient luminance in backlighting technology as it uses an auxiliary device to backlight LCD in dark places. It also enhances the readability of LCD units even in brighter service environments.