Screen to crystals liquids

A screen to crystals liquids, or LCD (Liquid Crystal Display), is one thin and light screen without no mobile part. It is composed from a liquid caught in numerous cells. Every cell is supply of contacts electrical workers with which to be able to apply to an electric field to the liquid that contains. Polarizzatori the same cells are contained to the inside of two screen along perpendicular aces between they. The crystals liquids twist of 90° the polarization of the light that arrives from one of the polarizzatori, allowing them to pass through the other.

Before that the electric field is applied, the light can pass through the entire structure, and, to part one small part of light absorbed from the polarizzatori, the apparatus turns out transparent. When the electric field comes activated molecules of the liquid aligns in parallel with the electric field, limiting the spin of the entering light. If the crystals are completely align to you with the field, the light that passes to you through is polarized perpendicular to according to polarizzatore, and therefore it is blocked of all. The pixel it will appear not illuminated. Controlling the torsion of crystals liquids in every pixel, how much light can be controlled to make to pass, corresponding illuminating the pixel.

The unit of measure of the dimensions of the screen is inch (2,54 cm), and is the distance measured in diagonal between two opposite angles of the screen; largest currently available, adapted to the vision of the TV to high definition, arrive to 65 inches with one resolution of 1920 X 1080 pixel. In the month of August 2007, Samsung constructor has introduced two new LCD of great dimensions (the greater one of 70 inches) which adopting the technique of retroilluminazione to LED, door the value of dynamic contrast to a 500.000:1 relationship.

One of the main characteristics of the panels to crystals liquids (made saves the retroilluminazione) is the low consumption of power electrical worker, than it renders them particularly indicates for applications in equipment fed from batteries electrical workers to you. Particular applications, as an example in the TV, involve instead consumptions total electrical workers rather elevate (a TV to you 32 "have powers of approximately 120-180W).