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Take a close look

— Why do high-definition displays and ultra-stable measuring technology form the perfect match.

Application of the differential laser interferometer SP 5000 DI in display production

Photo: peshkov / ilyaka -

Today’s technological developments follow a common trend in many industrial sectors: products are becoming more complex, more powerful and larger, with components and object structures becoming smaller and more compact.
This statement also applies to display manufacturing technology – one of the main applications for the differential interferometer SP 5000 DI developed by SIOS.

Consider, for example, the world’s largest 8K display from Sharp: this has a resolution of 7680 x 4320 pixels and a gigantic screen diagonal of 304.8 cm. Yet manufacturing the optoelectronic components to display each pixel is an enormous technological challenge. It consists of electronically controlling microstructures and arranging them at equal distances from one another. The general requirement for so-called stitching – the lining up of individual structures – is in the range of 45 nm/m. This is roughly comparable to the perfect alignment of cherry pits (Ø 8-10 mm) on the total area of Thuringia.

However, the requirements are not only increasing for electronics manufacturing or the semiconductor industry, but also increasingly for areas such as materials management, toolmaking and mechanical engineering with tight manufacturing tolerances.

All requirements have the following in common:

Components and object structures must be

  • produced,
  • verified and
  • measured.

Laser interferometry is the only method in length measurement that is able to combine enormous resolution with a large measuring range.
The most difficult problem in solving the measurement tasks is that the production processes of the displays described above do not take place under ideal conditions in a vacuum, but are exposed to the fluctuating influences of the environment, such as temperature, air pressure or humidity.

The greatest challenge and at the same time innovation in the development of an interferometer is to find or combine right high-tech materials and electronic components for industrial use, which have thermal and physical properties that are as stable as possible in order to ensure high measurement accuracy even over a longer period of time and fluctuating environmental influences.

SIOS has succeeded in developing an ultra-stable and fast differential laser interferometer for length and angle measurement with a resolution in the picometer range for industrial use.

The ultra-stable SP 5000 DI differential laser interferometer is characterized by unique thermal stability and can also be used for long-term measurements in research and development, e.g. for material investigations.

The developers of the SIOS have succeeded in creating an interferometer that is 25 times more stable than its competitors. The SIOS will be able to meet the demands of its target group in the future as well.