Bbc Brown, Boveri & Company, Limited

Bbc Brown Boveri Ag

Dieter Heimgartner

Meinolph Kaufmann

Terry J Scheffer

Hermann Amstutz

Hanspeter Schad

Meinolph Kaufman

In a process for the sampling of an electric signal changing over time, an electron beam (12) is deflected laterally and linearly over time and at the same time modulated in its intensity according to the instantaneous amplitude of the electric signal. The electron beam (12) generates on a fluorescent screen (14) a brightness-modulated bar of light, which is preferably sampled with a sensor (15) arranged ahead of the fluorescent screen (14) in the form of a CCD line camera having a linear array of sensor elements (15a, b, c). The read-out analog sampled values of the sensor (15) are subsequently digitized and further processed. The advantage of the process is its high broad-bandedness and resolution and the capability of being able to carry out an averaging without additional expenditure of time.

Process for the sampling of an electric signal varying over time and

A liquid crystal display based on the bistability effect, wherein the distance between the support plates is smaller than 10 .mu.m and the total twist of the liquid crystal is between 180.degree. and 360.degree., preferably about 270.degree.. Over the entire viewing area of the display, randomly distributed spacers are provided. Because of these measures, the range of the bistable action is so narrowed that the display can be driven with operating voltages outside this range, using conventional multiplexing techniques. A high degree of multiplexing with short switching times and excellent contrast is obtained. The range of viewing angles is very large and independent of the direction of illumination.

Liquid crystal display having degree of twist and thickness for improved

Liquid crystal display

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Baden, Switzerland

Dieter Heimgartner