Most system designs for control stations concentrate by default on the validation of the electronic process control computer according to SIL requirements (Safety Integrity Level). However, the safety gap in the digital displays often remains open. The cause of the error may lie in the display of corrupted data which operators on-site and in controlled operations cannot validate in real time. At best, the system is impaired or malfunctions; at worst, lives are put at risk. This means that for every safety-relevant manually operated display and control system, appropriate corrective action for error recognition is indispensable. With IconTrust, a technology is now available which supervises and reveals potential errors on TFT displays, using a PC-independent circuit. IconTrust derives the data sets as a finger print of the information currently being displayed. In this way, discrete pieces of information can be supervised independently and exclusively in various areas of the screen. Cost-effective IconTrust technology is universally suited for all applications with safety-relevant display of information, for example, in the cockpits of modern trains, in control rooms or manned surveillance systems. IconTrust can be used as a panel PC, a TFT monitor or a projector. It can also be integrated easily as an add-on into existing devices.