Friday, December 28, 2007

Creating an LCD

A proper blend of following features makes LCD possible: Polarization of light, liquid crystals can broadcast and vary polarized light, the structure of liquid crystals can be altered with the help of electric current, transparent substances can conduct electricity.

To produce an LCD you need two pieces of polarized glass. A special polymer that forms microscopic grooves in the surface is rubbed on the side of the glass that does not posses the polarizing film on it. Add a coating of nematic liquid crystals to a filter. The grooves will bring the first layer of molecules bring into line, within the filter’s direction. Thereafter, adjoin the second piece of glass with polarizing film at an angle of 90 degree to the first piece. Every consecutive layer of TN molecules will slowly twist until the uppermost layer is at 90 degree angle to the bottom, corresponding to the polarized glass filters.
When the light strikes the first filter, it is polarized. The molecules present in every layer then direct the light they obtain to the subsequent layer. When light pass over the liquid crystal layers, the molecules alter the lights plane of vibration to suit their own angle. As the light reaches the far side of the liquid crystal substance, it vibrates at the similar angle as the absolute layer of the molecules. If the concluding layer matches with the second polarized glass filter, the light will definitely pass through it.