Patent ID: 6723958
Filing Date: 2004-04-20
Classification: G02F,G05D

Abstract:
Display with a heater,the display having at least one display glass, the heater having an electrically operated heating element connected to a voltage supply, the heating element comprising a thin layer, the layer made of a material having an electrical resistance, wherein a value of the resistance has been determined by use of a first measuring instrument, 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, wherein the display further comprises: a second measuring instrument which determines a level of voltage present at the heating element, a third measuring instrument which senses current ambient temperature at the display, a memory which stores the determined resistance value of the heating element, a logic unit connected to the memory, the logic unit determining, for the stored resistance value in accordance with the determined voltage and the determined ambient temperature, a current-supplying period for applying electric current the heating element necessary to produce that heat output which will heat up the display to a certain operating temperature within a predetermined time, and a switching element, actuated by the logic unit, for regulating current flow through the heating element during the current-supplying period.