LCD TV's Polarizing Thoughts
| By: Ken Evans CRT TVs generated their picture using 3 electron guns. These worked by a moving image being flashed back and forth on the back of the screen to generate the image. In contrast, LCD Television screens work in a completely different way. Like computer screen and even digital photo frames, if you get in close to a flat screen television you will see that the image is composed of millions of minute squares, known as pixels. Each pixel is basically a square of blue, green or red light that is flicked on and off at inconceivable speeds which makes a moving picture in color. The tiny pixels are flicked on and off by rotating polarized light generated by liquid crystals. To understand LCD screens, we need to have a quick look at how light travels. Using 2 sets of polarized sunglasses, you are able to execute a simple experiment. Place one pair in front of the other, you'll be able to see right through both pairs, no problem. If you begin to rotate 1 of the pair, a change occurs and the light starts to get darker. By the time the sunglasses are at a ninety degree angle to each other you will not be able to see through the lenses at all. LCD screens work in much the same way to flick the color pixels on and off. Behind the screen is a very bright light shining out to the watcher. In front of this, there are the millions of pixels, each one made up of smaller areas called sub-pixels that are colored red, blue, or green. Positioned in front and behind each pixel is a polarizing glass filter positioned at a ninety degree angle to each other. That means the pixel normally looks dark. In between the two polarizing filters there's a microscopic liquid crystal that can be switched on or off electronically. As the liquid crystal is turned on, the light flows through it at a rotation of ninety degrees which passes through the polarizing filters and the pixel shows as bright. The transistors that control the pixels switch on and off very quickly, many times a second in fact. This light source that creates the image we see generates considerably less heat and as there are no phosphors they also use a lot less power than Plasma TVs and older tube TVs. Another big plus is that LCD technology emits no radiation from the TV screen. Upon their initial release, LCD TVs were generally in a higher price bracket than Plasma models. Prices are however much more on a par today and considering the lifespan of LCD TVs is typically much longer than an equivalent Plasma model plus they use much less electricity to operate, an LCD TV is in my opinion a great option. About the Author: Ken Evans likes to invite his mates around to watch the big game over a few beers and hot dogs. He just bought a new Aquos Sharp LCD TV that is bigger and better than his previous TV. Related Articles Very First Time Potential Buyers Article Regarding Automobile Auctions The Advancements Of Modern Mobile Phones Electric Guitar Lessons A True Wonder Michelle Penneys Kissing 101 And Why Kissing Technique Is So Important The Watchmen Soon To Be Released On DVD Are Sonic Care Toothbrushes Actually Useful How Jesus Shows His Love For People Through Music How To Use All Battery Coupons Or Coupon Codes To Get The Best Deal Rumiko Takahashi the Urusei Yatsura and InuYasha Manga Creator Magniwork Generator System Review A Sneak Peek Does It Actually Work Budget Guide For Home Studio Mics Hoover U5140 900 Tempo Reviewed Tips To Play Guitar Better La Crosse Technology Weather Station Forecasting at Your Fingertips Learn To Play Guitar Online Simple Convenient Music Instruction Family Love |