LIMOs beam transformation system Activation Line UV has been successfully used for years in the lift-off field of OLEDs in the production of flexible mobile phone displays. Thanks to their brilliant colors, OLEDs have conquered further fields of application, such as smartwatches, tablets, laptops, home theaters and especially the automotive industry (foldable displays, dashboard displays). In response to this trend, significant advances are being made in the industrial production of OLED displays of all sizes. In addition to simply scaling the display area and throughput, the need to boost productivity has also been identified. LIMOs new beam shaping technology for UV lasers comes into play.
Solid-state lasers are now also available for use with the lift-off process. With a comparable output, these lasers are superior to the excimer lasers in terms of operating costs. Solid-state lasers deliver excellent beam quality, usually in a Gaussian beam profile. With the aid of special micro-optics, several of these lasers sources are transformed into the profile needed for laser lift-off (LLO), with lengths of up to 1,000 mm and widths of less than 50 µm.
The development team at LIMO has now enhanced the optical design far enough that the Gaussian profiles can be turned into a line with a length of up to 1,000 mm and a width of 30 µm. The new features include significantly steeper edges and a wider intensity maximum. This allows an increased productivity by more than 30%. In addition, the sensitive OLEDs are subjected to lower thermal loads (lower ash value), yields are higher, and the OLED displays produced have a longer lifespan.
- > 30% productivity increase
- Higher process speed thanks to simultaneous process time
- Reduced thermal stress on the material
- Modular mechanical design
- Retrofitting of existing Activation Line UVs possible that allows manufacturer to either directly boost productivity or significantly extend the service life their lasers (at lower laser energy with existing systems)
- Various additional options available
Since 2013 the Activation Line UV has been used successfully in the display production. Well-known companies in South Korea and Vietnam use these beam shaping systems in their production facilities as efficient tool for the non-destructive way to separate the substrate - laser lift-off – for flexible OLEDs. LIMOs sophisticated optical system helped to made the mass production of innovative and more efficient mobile devices such as smartphones, tablets and smartwatches possible.
For the laser lift-off process of displays, we offer Activation Lines with different line lengths from 100 to 1,000 mm. In addition to complete systems with long lines for integration into production, LIMO also offers cost-effective systems with shorter lines, which can be used in advance in the process development.
This new technology will also unlock other applications for UV solid-state lasers, such as annealing and crystallization. As beam shaping continues to improve, the new systems will be increasingly capable of replacing the excimer laser in its current fields of application. Further fields of application:
LIMO develops and produces customized solutions – from creating and defining the process parameters to delivering the finished solution. At our Application Center, we conduct processing tests together with the customer to determine the appropriate beam parameters. The final ingredient to our holistic approach is the LIMO service portfolio (training, integration, maintenance). This allows us to help our customers and partners achieve reliable production processes and thus strengthen their productivity and competitiveness.