Screen assets and liabilities to you

Screen LCD with a modest number of segments, like those used in the calculators or the digital clocks them, is supplies of a contact electrical worker for every segment. It marks them electrical worker in order to control every segment is generated from an external circuit. This type of structure becomes improponibile as the number of segments increases.

The screen of medium dimensions, like those of the electronic agendas, structure to passive matrix has one. This type of structure has a group of contacts for every line and column of the screen, instead that one for every pixel. The disadvantage is that a pixel can be only controlled to the time, the others pixel must newly remember their state until the control loop not dedication to they. The result is a reduced contrast and one sure difficulty to visualize the images in express well movement. The problem clearly goes getting worse as the number of pixel increases.

For the screen to high resolution, like the monitor for computer, a system to active matrix is used. In this case screen LCD contains one thin film of transistor (Thin Film Transistor - TFT). This device memorizza the state electrical worker of every pixel of the screen while the others pixel come dawn to you. This method allows to obtain more luminous and clear images much regarding the traditional LCD.

The average life of screen LCD is attested to the day around to the 50,000 hours today. This data, united to the remarkable and constant reduction of their price, renders this technology one valid alternative to the cathodic tube screen.