Labor fuer Bildschirmtechnik Abschlussbericht

The technology of flat panel liquid crystal displays provides the most progressive and promising solutions for high resolution direct-view and projection displays. Beyond direct-view displays which are actually limited to 14''-17'' diagonals, projection systems using LCDs as light valves can fulfil the wider requirements. Therefore, the aims of the project were to develop displays for both applications and to demonstrate their qualities practically. The activities include the investigation of all applied films including colours, the optimization of equipment and manufacturing parameters, cell fabrication and the development of addressing circuits. Significant results are two 14'' full color TV-displays with a-Si-TFT- and MIM-addressing respectively, a 5'' full color 1.2 Mpel MIM-display for direct view or projection, two 2'' full color 140 000 pel displays with a-Si- and CdSe-TFTs respectively, and a projector with three reflective 400 000 pel a-Si-TFT-light valves. Moreover fast switching ferroelectric displays with high contrast and PDLCDs in reflective or transmissive operation mode. Finally integrated line and video drivers were developed in CdSe- and poly-Si-technique respectively. In comparison to other solutions the displays show higher brightness and a wider viewing angle. For their industrial exploitation it is essential that they can be fabricated by a low-cost process with only 3 or 4 masks instead of 7 as usually needed. (orig.)Available from TIB Hannover: F95B2043+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Groundwater and ecosystems

In UNESCO World Water Assessment Programme (WWAP). The United Nations World Water Development Report 2022: groundwater: making the invisible visible. Paris, France: UNESC