Learning About LCD Screens

A lot of people never wonder about the LCD screen sitting there in front of them while they hack away on the PC. I mean, why would they? It's just a device that displays what the computer is pumping out to it. It's comparable to a T.V. in a way that people don't think about how the T.V. works as long as it keeps a good picture and displays their programs, or their currently games. But by reading this article you can impress your family, friends, or just any one around you with the information you'll learn. The only trick is to get the subject to come up in a crowded place so others can hear you! But I'll leave that part up to you, and focus on just the LCD for right now,lol.

First off, I guess we can get to the basics. LCD monitors work by blocking light, sandwiching a solution of liquid crystals between two perpendicularly aligned panes of polarized glass. In other words, a thick liquid is in between two plates of glass that never touch each other. As light strikes the first filter, it is polarized. The molecules in each layer then guide the light they receive to the next layer. As the light passes through the liquid crystal layers, the molecules also change the light's plane of vibration to match their own angle. When the light reaches the far side of the liquid crystal substance, it vibrates at the same angle as the final layer of molecules. If the final layer is matched up with the second polarized glass filter, then the light will pass through.It's possible to alter the strength of the light coming in as it passes through this liquid, and out of the back glass. It really depends on the voltage (strength) of the electrical charge running through the liquid crystals which will untwist so that the light passing through the back polarized glass are affected.

Basically, these displays can switch between the fully twisted state (the 'light' state) and the fully untwisted state (the 'dark' state) or somewhere in between (the 'grey' state). With this combination of darks and lights, you can create any picture in black and white that you want. It all depends on where you apply the electrical charge, and where you don't. The most basic of basic LCD's consists mostly of a mirror in the back, which makes it reflective. Then a piece of polarized glass, and a common electrode plane made of indium-tin oxide (don't ask me what that is ... please). A layer of liquid crystal substance, then another piece of glass with an electrode in the shape of the rectangle on the bottom and another polarizing film at a right angle to the first one. The electrode is connected to a battery or other power source. With the absence of electricity, or current, light entering through the front will simply hit the mirror and bounce right back out.

But when the current is running to the electrodes, the liquid crystals between the common-plane electrode and electrode shaped like a rectangle untwist and block the light in that region from passing through. Giving a dark state in that area.That pretty much sums up the basic LCD's, but there's still much more to type about. If I get enough replies, I might type some information about color LCD's, Black lit vs. Reflective, LCD vs. Plasma, Advances, pixels, or any thing else I can think of.