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PORTABLE ELECTRONIC DEVICE

IP.com Disclosure Number: IPCOM000235498D
Publication Date: 2014-Mar-05

Publishing Venue

The IP.com Prior Art Database

Abstract

In a portable electronic device, an ambient temperature (T) is sensed by means of a temperature sen-sor (1). In addition, it is assessed if the portable electronic device is exposed to condensation. A corre-sponding condensation indicator (Ci) is provided. The condensation indicator is determined based on a dew point and based on sensed temperature values of the past or temperature derived from the past sensed temperature val-ues.

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PORTABLE ELECTRONIC DEVICE

Abstract

         In a portable electronic device, an ambient temperature (T) is sensed by means of a temperature sen- sor (1). In addition, it is assessed if the portable electronic device is exposed to condensation. A corre- sponding condensation indicator (Ci) is provided. The condensation indicator is determined based on a dew point and based on sensed temperature values of the past or temperature derived from the past sensed temperature val- ues.

Technical Field

          The present invention relates to a portable electronic device, to a method for operating a portable electronic device, and to a computer program element for operating a portable electronic device.

Background Art

          Portable electronic devices such as smartphones, for example, may contain one or more sensors which may be impacted in their operation subject to envi- ronmental conditions.

Disclosure of the Invention

          According to a first aspect of the present invention, a portable electronic device is provided. In case of the device being exposed to condensation, a con- densate having deposited on the device as a result of the condensation process may impact a measurement, e.g. a measurement of ambient temperature, or a measurement of


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the capacitance of a touchscreen of the device. Condensa- tion may occur, for example, when moving the device to a warmer and more humid environment. In view of a lower temperature of the device relative thereto, the humid air may start building a film of water on the device. During this process, latent heat is released during the process of condensation and acts as a heat input to the device. Over time, the temperature of the device approximates the ambient temperature and the condensate may evaporate again, wherein the heat bound in the condensate is re- leased.

          Hence, in case it is desired to sense the am- bient temperature, for example, a temperature value may be sensed that does not correspond to a real value of the ambient temperature but rather deviates therefrom owed to the heating effect of condensation, or later on, owed to the cooling effect of evaporation. In case the device contains a touchscreen, the condensate may impact the in- put functionality. Hence, it is desired to compensate for one or more of such effects.

          For this purpose, a condensation assessment module is provided in the portable electronic device which takes an assessment as to if the portable electron- ic device is exposed to condensation. The condensation assessment module assesses the occurrence of condensation by determining a dew point temperature. Condensation typ- ically occurs, when the dew point of the environment ex- ceeds a temperature of an object / device that becomes exposed to this environment. Hence, it is preferred that the condensation assessment module is configured to de- termine the dew point temperature - in short dew point. The portable electronic device comprises a temperature sensor for sensing an ambient tem...