Martin Schadt, PhD, is a Swiss physicist
Biography edit
In 1970 the physicists Martin Schadt and Wolfgang Helfrich invented and patented the twisted nematic (TN)-effect in the Central Research Laboratories of F. Hoffmann-La Roche Ltd, in Basel, Switzerland. The patent (Swiss patent No. 532 261) was licensed world-wide to electronics and watch industries and thus initiated a paradigm change towards flat panel field effect liquid crystal (LC) displays.
In the early 1970s Martin Schadt started to investigate correlations between liquid crystal molecular structures, material properties, electro-optical effects and display performance to obtain criteria for novel, effect-specific liquid crystal materials for TN- and subsequent field-effect applications. His interdisciplinary approach involving physics and chemistry became the basis for modern industrial LC-materials research and led to the discovery and production of numerous new functional molecules and new electro-optical effects. In 1970, shortly after the invention of the TN-effect, he developed the first commercial room temperature nematic liquid crystal mixture with positive dielectric anisotropy, used in the displays of the first Japanese digital TN-LCD watches. The pharmaceutical company Roche established itself as a major supplier of liquid crystal materials for the emerging LCD-industry.
Achievements edit
Apart from his pioneering work on the TN-effect, novel liquid crystal materials, organic semiconductors and biophysics, he invented or co-invented the following effects and technologies:
- first organic light-emitting diode (OLED) (1969 as post-doc at Canada’s NRC; US patent 3,621,321),
- Kerr effect in LCs (1972),
- field-induced guest-host color switching (1979),
- dual frequency addressing and materials (1982),
- optical mode interference (OMI)-effect (1987,)
- deformed helix ferroelectric (DHF)- and short pitch bi-stable ferroelectric (SBF)-effect (1989, 1990),
- linearly photo-polymerisation (LPP)-technology (1991).
As principal inventor and head of Roche LC research he promoted the development of LPP-Photo-alignment into manufacturing (1992-2002). As a key technology it enables contact free alignment and photo-patterning of monomeric and polymeric liquid crystals by optical means instead of mechanically. This has opened up novel display configurations as well as a wide range of new optical thin-film elements on single substrates, such as LC-interference color filters, optical retarders, cholesteric optical filters, wide-view films to enhance the field of view of LCDs, novel optical security elements for document and brand protection, stereo-polarizers as well as nano-and micro-corrugated optical polymer thin-film elements enabling polymeric antireflective and directional light scattering coatings.
The molecular design approach of Martin Schadt and his team has led to the discovery, patenting and production of the following commercially important liquid crystal classes: alkyl cyano Schiff’bases and esters (1971), phenyl-pyrimidines (1977), alkenyl liquid crystals which have become key for all state-of-the-art high-information content LCDs (1985-1995), numerous halogenated liquid crystals (1989-1995) as well as the first strongly non-linear optical (NLO)-ferroelectric liquid crystals (1992).
Until 1994 Martin Schadt was the head of the Liquid Crystal Research division of F. Hoffmann-La Roche Ltd. As a spin-off from Hoffmann-La Roche in 1994 he founded the interdisciplinary research and development company ROLIC Ltd. From 1994 until his retirement from the operating business in October 2002 Martin Schadt was CEO of ROLIC Ltd. and delegate of the board of directors. He retired from ROLIC in 2005 and is now active as a scientific advisor to various research groups and governmental agencies.
Awards edit
- Roche Research and Development Prize, 1986, "For his decisive contributions to the knowledge of liquid crystal materials, their physical properties and electro-optics which have formed a basis for the breakthrough of a new display technology. His work has led to a new class of marketable products and to the scientific reputation of Roche in a new field."
- Special Recognition Award of American Society Information Display (SID), 1987, "For significant and continuing contributions to the theory and reduction to practice of high information content liquid crystal displays."
- Karl Ferdinand Braun Prize; highest recognition Award of SID, 1992, "For his outstanding and sustained scientific and technical contributions to the development of twisted nematic and other liquid crystal display technologies."
- Fellow Award SID, 1992, "For his pioneering contributions to research and development of twisted nematic and other liquid crystal devices and materials."
- Aachener und Münchener Preis für Technik und angewandte Naturwissenschaften, 1994, "Für die bahnbrechende Erfindung der Flüssigkristallanzeige als Schlüsselbauelement der Informationstechnologie" (for the pioneering invention of the Liquid Crystal Display as a key-component for information technology).
- Robert-Wichard-Pohl Preis der Deutschen Physikalischen Gesellschaft, 1996, to Wolfgang Helfrich and Martin Schadt, "In Würdigung ihrer Erfindung und Entwicklung von Flüssigkristallanzeigen (LCD-Liquid Crystal Displays" (in appreciation of their invention and their development of Liquid Crystal Displays).
Publications and Patents edit
- 167 scientific publications in leading international journals,
- 110 lectures,
- Co-author of 4 books,
- More than 116 basic patents – among them 100 US patents – each filed in 10 - 12 countries.
Source edit
Martin Schadt 2006/2007