Siemens Aktiengesellschaft

Jürgen Wenning

Heinrich Noll

Peter Brandt

Georg Nehm

Werner Paulsen

Alf Burau

Peter Schilling

The invention relates to a DSTN display with electromagnetic protection, comprising an active cell () and a passive cell (), whereby the active cell () comprises electrodes () and the passive cell () faces an observer of the display. The passive cell () comprises a metallic transparent layer (). Said metallic layer () is electrically connected to a ground potential (G).

DSTN display with electromagnetic shielding

A method for driving an electroluminescent lamp to emit light at a brightness set level includes providing a variable bias voltage to the electroluminescent lamp. The variable bias voltage is increased with the duration of the on-time of the electroluminescent lamp. To stabilize the electroluminescent lamp at the brightness set level against aging, a closed loop control of the brightness of the electroluminescent lamp is applied, which is subject to said duration of the on-time the electroluminescent lamp.

Driver circuit and method for driving electroluminescent lamp to emit light at brightness set level

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Mainaschaff, Germany

Jürgen Wenning