In the production of electronic display elements the correct function of LCD displays is checked. For this purpose, various test patterns are displayed, which are to be checked for completeness by an image processing system.

The task requires a system that is easy to learn and can be controlled from the host computer of the test station. In this application the sequences of the control are selected via digital I/O. For teach in, the respective control image is recorded and the segments are determined automatically. To ensure the position tracking of the DUTs in the software, a pattern control is performed. The switched on display symbols are automatically checked in incident light or with the integrated backlight. The system is easy to operate and can be used to check short circuits or interruptions in the display controls and the segments themselves for function.