LCD (Liquid Crystal Display)

By: Robert Thomson


LCD (Liquid Crystal Display)
LCD (Liquid Crystal Display) is a technology that employs rod like molecules/liquid crystals that can curve light. Without energizing crystals, it can lead light through polarization that causes its instinctive color to show in the background. Once energized, crystals can manipulate light towards a polarizer, which shows the dark actualization of the transverse polarizer.
In 1970, the LCD's ability to operate in a lesser power than an LED (Light emitting device) made it a preferable material for battery-operated gadgets such as digital watches. In 1990, laptops with colored LCD screens were introduced to the market and were warmly welcomed by the consumers. In 2003, records showed that more LCD monitors were purchased than CRTs.
Uses of LCD
LCD Projectors
LCD projectors use Metal halide lamp to send light and display images. Metal halide lamp provides a prism that divides light into three single poly silicone panels. Each division represents red, green, and blue video signal components. Polarized lights move to crossover the panels and enable every pixel to open and let light through or close to block it. The mixture of open and close pixels creates variety of colors on the displayed image.
Metal Halide lamp provides great amount of light in a very limited space and offers an ideal combination of wide color spectrum and matching color temperature. These characteristics made this lamp ideal for projectors except for its expensive bulb replacement.
LCD TVs
LCD TVs operate in the most developed type of LCD, active-matrix LCD. Active-matrix LCD uses a TFT (Tiny Film Transistors) technology, which has mini alternating capacitors and transistors. The glass in the front layer of an LCD TV is carved in the interior where liquid crystals form a layer. Liquid crystals may allow light to crossover or block them from doing so. The combination of clear and dark crystals creates patterns that form an image. The rapid movements of TFT operate each colored pattern designating three sub-pixels, red, blue, and green filters to create a particular color.
LCD Monitors
LCD technology was initially introduced on laptops before it was integrated on desktop monitors. These flat monitors are actually composed of five different layers, which are single layer of liquid crystals, backlight, polarized glass, colored pixels, and a secondary sheet of polarized glass. Crystals are operated using the exact varieties of electrical charges, which allow them to close and open to create images on the screen.
Unlike CRTs, LCD monitors operate within a minimal power requirement and are 60% more cost-efficient. They also provide wider viewing screen and emit lesser amount of radiation.
LCD Drawbacks
LCD technology provides limited viewing capacity. It can only produce quality images if it is in their standard format. Viewing images not similar to its standard format results to different HDTV issues and errors. Most LCD monitors have limited scaling capacity and cannot operate on reduced screen resolution.
LCD monitors need more time to respond compared to its CRT equivalents. A single LCD pixel is evidently displayed for the entire length of a frame; thereby causing ghosting and blur effects on hurried image movements.
The flat and thin feature of an LCD screen makes it vulnerable to breakage and damages. If pressure is applied to any part of an LCD screen, dead pixels may occur.
LCD screen’s back-lights fluorescent lamps contain mercury that is toxic, unlike CRT monitors that mercury-free.

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Bob Marley is a freelance writer who is the author of articles such as Sharp Introduces Solar Powered 26 Inch LCD, 1080P LCD, and www.tech-faq.com/how-do-lcd-projectors-work.shtml ">How do LCD projectors Work Visit LCD (Liquid Crystal Display).

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