| 摘要 |
A mobile communication device is provided. The mobile communication device comprises a processing unit, a battery unit, a solar cell unit, an electronic switch circuit and an analog to digital converter (ADC). In the mobile communication device, the solar cell unit receives a light and thus a luminance and transforms the luminance into an analog voltage. The ADC is configured to convert the analog voltage into a digital voltage. The processing unit is used to transmit a control voltage according to the digital voltage. In response to the control signal, the electronic switch circuit is controlled to turn the solar cell unit on or off and the solar cell unit provides all, a portion or none of a working current required for the processing unit according to the action of the electronic switch circuit. In addition, a luminance value may be generated according to the light received by the solar cell unit so that a user may be aware of the light quality of the ambient environment, thereby preventing himself/herself from reading under a poor light source environment thus protecting his/her eyesight from being damaged.
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