Siemens Aktiengesellschaft

Hans-Peter Lorenz

Manfred Kobale

Hans Krueger

Konrad Mund

Helmut Freller

Rolf Wengert

Friedrich Horauf

An electrochromic display cell is described which has a front electrode of tungsten trioxide layered on a support surface and a rear electrode of titanium nitride layered on a support surface. The rest potential and large capacity of the rear electrode permit a fast image cycle time at the front electrode and obviate the need to reverse potential polarity during cycling.

Electrochromic display cell I

A slurry comprised of particulated glass-forming substances, with or without particulated relatively clear or light-colored metal oxides, dispersed in a photolacquer is applied as a uniform layer on a surface of a color image screen. Such layer is then developed via conventional photoforming techniques to produce sites or windows for phosphor dots and the resultant window-containing layer is heated, prior or subsequent to application of phosphor dots in such windows, at a temperature in the range of about 350.degree. to 500.degree. C. In instances where metal oxide particles are present in the slurry, the resultant layer becomes opaque or dark upon tempering and in cases where only pure glass-forming substance particles are in the slurry, the resultant layer becomes opaque or dark upon tempering in a reducing atmosphere. Electrical conductivity may be imparted to the light-absorbing coating by addition of selective conductive materials to the initial slurry.

Method of producing light-absorbing edging about phosphor dots on color

A liquid crystal display device having two carrier plates each having a first surface supporting electrically conducting electrode layers, the plates being hermetically sealed together with the first surfaces in facing relationship to form a chamber receiving a liquid crystal layer characterized by a covering layer disposed on each of the first surfaces. In the preferred embodiment, each of the first surfaces is provided with an obliquely vapor deposited aligning layer inbetween the conducting layer and the covering layer which covering layer has a thickness no greater than 0.05 microns and preferably less than 0.02 microns. The covering layer may be a silane derivative bonded by chemosorption on the aligning layer, a nitride such as silicon nitride, or an oxide. In producing the display device, a method which includes vapor depositing aligning layer on the first surface of each carrier plate subsequent to applying the electrical conducting electrode layers and prior to sealing the plates includes the improvement of applying the covering layer. The covering layer may be applied by sputtering-on process, by pyrolytic process, by a resinate technique, by immersion of a material and by reacting with a material applied to the surface to be coated.

Liquid crystal display device

A liquid crystal type display system containing a liquid crystal layer with positive dielectric anisotropy located between two carrier plates whose mutually opposite surfaces each have an electrode coating as well as an insulation layer which has been vaporized on obliquely. A rotating display cell with obliquely vaporized-on layers is provided by choosing the vapor deposition angle for one of these layers in excess of about 75.degree. and for the other layer less than about 65.degree. and positioning the carrier plates in spaced relationship to one another without any substantial rotating of one plate relative to the other thereof.

Growing community of inventors

Feldkirchen, Germany

Hans-Peter Lorenz