OLEDs are area emitters. The light is generated directly in the plane of the light source, and is not – unlike in other area light sources - distributed over the surface by means of lightguides with side or direct incoupling.
This fact enables the structuring of the lighting surface into sharply separated cells which can be addressed independently from each other. The shape of these segments can be chosen rather freely – within the framework of production design rules.
As an example, adjacent segments can be dimmed at different levels, introducing shadow effects into the lighting pattern, thus creating a 3D perception in the lighting plane. The gaps between the independent segments can be kept at a very thin level of just a few 10 microns.
Separated segments can be realised in different colours as well. However, for such a case larger gaps have to be considered due to production tolerances.
The feature of segmentation leverages applications from the areas signalling and signage, but is also highly attractive for the use in automotive or architainment applications.
Various switching modes of a 3-fold segmented OLED
Transparent OLED with inactive window segment in the centre (LED-Gadget in the background switched on in left picture)
Same principle of the inactive window realised on an OLED with mirror surface