| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To extend a service life of electronic paper and a battery contained in it and also ensure high security. <P>SOLUTION: After the time measured with a timer 12 elapses for a preset time, two-colors changeover operation is performed over the whole area of electronic paper 2, and if the lowest voltage of a secondary battery 11 is lower than a prescribed voltage value, two-colors changeover operation over the whole area of electronic paper 2 is stopped at an intermediate color, and then power supply from the secondary battery 11 is blocked, and if power supply from the secondary battery 11 is blocked with memory 5 being volatile, the held information is deleted. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
