LCD - displays used in the automotive industry consist of a glass body, a flexible circuit board and a controller PCB.
Caused by the high number of contacts the average distances between the conducting tracks run down to 0.25 mm.
Therefore these three components have to be positioned towards each other by a vision system.
The necessary precision of position should reach 20 µm. The vision system aligns the single components using 5 in x/y-direction movable cameras and 8 light sources. The components are held in a workpiece carrier equipped with up to 4 motors, which are driven by the vision system.
During an aligning process, which also takes care of the dimensional differences of the flexible components, the conductive tracks are positioned to each other. Also the coding mark on the LC-display, which shows the display angle, is checked by the vision system.
In order to work with the various displays, the cameras and lightings are movable.
The PLC-interface selects the currently handled work piece.
In the course of this the vision system controls up to 8 motors for positioning of the components and cameras.
The inspection system aligns the single components of up to 32 different products in a measuring cabin using 5 cameras.
