| 摘要 |
The cover of a hand-held mobile station (MS) according to the present invention has been coated or mixed to include liquid crystals changing color with changes of temperature, or thermochromic liquid crystals TLC. Thermochromic liquid crystals can be used to implement reversible or irreversible color changes on several different color change temperature ranges. The cover (C) changes its color when changing temperature forming patterns (A1) following heat gradients, in its TLC-comprising parts. The color change indicates both heat applied externally to the mobile station and the heating caused by the internal energy consumption of the mobile station. It is therefore possible, with the color change, to leave a slowly vanishing trail of a keypress or indirectly describe the remaining usage time of a battery used as the power source of the mobile station on basis of heating caused by load on the power source. In a method according to the present invention the temperature changes of a hand-held mobile station are indicated with color changes of the cover of the mobile station, when the cover has been coated with thermochromic liquid crystals or when it has been mixed with thermochromic liquid crystals in order to arrange the color changes described above. <IMAGE> |
