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Spectrally selective reflecting thin-film filters for laser display technology

: Rickers, C.; Vergöhl, M.

Klages, C.-P.; Gläser, H.J. ; Fraunhofer-Institut für Schicht- und Oberflächentechnik -IST-, Braunschweig; Fraunhofer-Institut für Elektronenstrahl- und Plasmatechnik -FEP-, Dresden:
4th International Conference on Coatings on Glass 2002. Proceedings : Advanced Coatings on Glass & Plastics for Large-Area High-Volume Products, November 3 - November 7, 2002, Braunschweig, Germany
Braunschweig, 2002
International Conference on Coatings on Glass (ICCG) <4, 2002, Braunschweig>
Conference Paper
Fraunhofer IST ()

To provide a contrast improvement for projection screens used with the laser display technology, a thin selective reflecting filter was designed. To overcome the problem of unknown starting designs and permit a new evaluation technique, an evolutionary algorithm was implemented. Due to the lack of known target spectra rather than known features of the target spectra, a novel evaluation procedure using color metrics was implemented. Different selective reflecting filters were deposited on glass as well as on plastic substrates by reactive mid-frequency magnetron sputtering. In-situ ellipsometry was used for process control and in-situ redesign of the filter.