Display with a heater

US6723958B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Peter Brandt · Berghausen, DE
• Wolfgang Siegel · Schifferstadt, DE

Key dates

• Filing date: Nov 20, 2001
• Grant date: Apr 20, 2004
• Expiry date: Jan 11, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D23/2401
• WIPO field: Control
• WIPO sector: Instruments

Abstract

Display with a heater, a) the display having at least one display glass, b) the heater having an electrically operated heating element connected to a voltage supply (UB, GND), c) the heating element comprising a thin layer, d) the layer being made of a material forming an electrical resistance, and e) the layer being applied over a surface area to the at least one display glass or being embedded over a surface area in the display. f) A first measuring instrument (4) is provided, which determines the resistance value of the heating element, g) a second measuring instrument (5) is provided, which determines the level of the voltage present at the heating element, h) a third measuring instrument (3) is provided, which senses the current ambient temperature at the display, i) a memory (7) is provided, which stores the determined resistance value of the heating element, j) a logic unit (6) is provided, which determines for the stored resistance value in accordance with the determined voltage and the determined ambient temperature a current-supplying period for the heating element necessary to produce that heat output which will heat up the display to a certain operating temperature with…