Liquid crystals

Liquid crystals have been uncovered by an Austrian botanist in 1888. Liquid crystal state is a state intermediate between crystalline solid and liquid normal phase . Number of substances of this condition increased until 1930 after which interest in this class

substances has decreased.

Research has been resumed in 1960 when liquid crystals have started practical applications in engineering and medicine. Most common applications are in electronic field, the display devices.

Liquid crystals are substances that act as a liquid and the solid. Molecules in liquid crystals can move each relatively easy, as all molecules in a lichid.Totusi a liquid crystal molecules tend to orient themselves in the same manner, like the molecular arrangement of crystals malt.

Liquid crystals retain fluid and natural solodifica only after certain temperatures and pressures.

At a sufficiently high temperature or low pressure, the molecules change order resulting in a crystal liquid crystal trnsformarea. At a sufficiently low temperature and high pressure liquid crystal molecules cease to move and liquid crystals turn into solid crystals.

Many classes include liquid crystal liquid crystal and liquid crystal termotrope biotrope.

Optical properties of a liquid crystal can often be handled by submission to an electric or magnetic field to change the orientation of its molecules. For example applying a small electric field some liquid crystal changes from clear to cloudy or property gain to rotate polarized light.

These types of liquid crystals are used to build devices used in digital watches, computers, TVs, laptops, etc..

Liquid crystal devices are powerful and often uses less power than conventional devices .. Some liquid crystals reflect different amounts of light depending on the orientation of molecules lor.Orientarea these molecules depends on temperature. These types of liquid crystal thermometers are used to display colors appropriate temperature critalul liquid substance that is in contact.

Liquid crystal devices (LCD) television screens as using a particular substance that changes its properties when current is applied to LCD electric.Tehnologia is already used to computers and digital watches. a TV screen (l. CD) uses very little power so is ideal for making portable TV's.

LCD displays have the following characteristics:

brightness, color contrast, high visibility, low power consumption, response speed opto-electronic memory for life mare.Aceste liquid crystal displays have the advantage that can be powered by solar batteries, allowing a cost reduced.

Liquid crystal displays (LCD) standard manufactured by Seiko Instruments Inc. are made in technology TN (twisted nematic), which provides a strong contrast and a large viewing angle. Models are products of different sizes and number of digits are diverse.Afisajele used by this company are very advantageous because they can meet customer's need in terms of size and variable number of digits or special characters.

Alphanumeric liquid crystal displays are the latest news, allowing the computer to get big companies products increasingly complex to satisfy the most demanding customers from all over the world.

Although discovered in the IXX century, until the mid twentieth century a large liquid crystals find their application in modern technology.