Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Introduction of screen printing technology in OLED displays by depositing conductive inks for pads and light emitting materials

The development and use of large-area screen printing have been performed within this project to deposit inorganic conductive and organic semiconductive coatings and patterns to produce thin-film large-area light-emitting polymer devices with reproducible performance in a continuous process at low cost. The advatages using large-scale screen printing processes for light-emitting polymer for displays and information panels are in processing (environmentally friendly, continuous process), price (integration of components) and product features (design freedom, large-area, flexible devices).

However, to enter these markets, development of large-scale fabrication technology is required, utilising the advantages of polymer processing. The technologies currently used are not directly suitable for large-scale production of most applications. Present deposition techniques include spin coating and dip coating for the deposition of the polymer layers and physical vapour deposition for the ultra-thin metal electrode.

The advantages using the screen-printing technology for these purposes are:

- Uncoupling of emitting device from electronics, improved connections between electrodes and electronic circuitry and higher raggedness and resistance to scratch.

- Use high-resolution screen-printing which has been already used in other electronic related areas with deposition of layers very close per nature and thickness to those addressed in this project.

- Large area screen-printing can bring a cost breakthrough in the polymeric area emitters, including for applications requiring various colours.

Reported by

Centro Ricerche Fiat S.C.P.A.
Strada Torino 50
10043 Orbassando
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