(Dual Scan Twisted Nematic Display) With this technology, the voltage is applied via a conductive matrix on the display. A special controller module takes over the addressing of each pixel according to columns and lines. This type of control is far less complicated, which shows in clearly lower production costs. However, this passive technology takes its toll in image quality. The display's contrast is reduced and the brightness distribution is not as even as with the expensive TFT technology. However, for illustrations on the terminals the displays are sufficient.