Thin Film Transistor

Thin Film Transistor (TFT), in Italian thin film transistor, is a technology applied to display the plates to crystals liquids (LCD) or to OLED that come in this way it identifies to you like display to active matrix.

The fundamental difference between a TFT and a traditional panel LCD is the way in which it comes polarized the liquid crystal. In both the technologies the liquid crystal molecules are oriented once that they are subordinates to an electric field, but while in the traditional LCD a tension from the outside of the visualization panel is applied, like in a condenser, technology TFT the electric field comes applied directly in the necessary point, removing therefore the introduced parasitic abilities from I disentangle of the tracks necessary in order to catch up the dot, through note a transistor to directly realized thin film with a superficial substrate of material deposited transparent semiconductor on the inner ones of the glasses that accommodate also crystals liquids.

The more obvious advantage is in lowlands necessary currents of pilotage for the polarization of crystals, in the low tensions of polarization necessary for the commutation of the transistor and in the times of answer necessary to the fluid in order to change of state and therefore to make to journey or less the light that crosses it. All this allows to realize easily display with a high number of dot, pixel, than it would otherwise not have been possible to make.

The used technology rispecchia much close gives that anchor today used in the realization of dynamic memories (DRAM) with the difference that the single cells of the transistors come realized directly applying a conductive substrate, opportunely drug addict, directly on the glasses of the panel, rather than to work on a classic die in silicon.

The technology for the construction of active matrices OLED, has the same scope of that one of the LCD: to carry to the realization of a display to flat matrix. Substantial the differences are in the elettroluminescente element that, in this case, is represented from the OLED. To replace the LCD would allow to obtain display more performanti from all the points of view: optical, since the emission of the OLED is to 360°C; from the point of view of the consumptions, since the OLED is for its emissivo and not trasmissivo nature like in the case of the LCD; from the point of view of the construction and the flexibility. The only problem is, today, the time of life of the colors: still a time of life has not been caught up, for the blue above all, sufficiently high.

While general technology TFT was developed in the United States to leave from 1979 near the university of the Minnesota and carried in the years succeeded you to the realization of resistive and capacitive nets to the high integration for the realization of mainframe, the implementazione of this technology for the realization of LCD to active matrix must to varied Japanese industries and has been subsequently implemented and elaborated also from taiwanesi, Korean and alsolately Chinese colossus of the electronics.