Information display device, information displaying method, and computer program product

A method of displaying information executed in an electronic paper display apparatus, the method comprising:

• displaying, by an electronic paper display unit, first image information including confidential information;
• storing, at a storage unit, the first image information and a second image information consisting of non-confidential information;
• controlling, by a display control unit, writing and rewriting the first image information on the electronic paper display unit;
• supplying, by an electric-power supply unit, electric power to the display control unit;
• and
• determining, by a determination unit, whether or not the electric power to the display control unit is lower than a threshold, wherein
• when the determination unit determines that the electric power to the display control unit is lower than the threshold, the display control unit saves the first information on the electronic paper display unit into the storage unit, and rewrites the first image information on the electronic paper display unit to the second image information consisting of non-confidential information;
• wherein the electronic paper display apparatus includes a thermoelectric generation unit that does not include a battery, and the method further comprises converting thermal energy provided from a body temperature of a user into electric power upon the user contacting the thermoelectric generation unit, and supplying the electric power to the display control unit as operating power of the display control unit, and
• wherein the method further includes determining, by the determination unit, whether the user is in contact with the thermoelectric generation unit, and when the determination unit determines that the user is not in contact with the thermoelectric generation unit, the display control unit performs a control of rewriting the first image information displayed on the electronic paper display unit with second image information.

A non-transitory computer readable storage medium having stored thereon a computer program having computer-readable program codes that when executed by an electronic paper display apparatus causes the electronic paper display apparatus to perform a method comprising:

• displaying, by an electronic paper display unit, first image information including confidential information;
• storing, at a storage unit, the first image information and a second image information consisting of non-confidential information;
• controlling, by a display control unit, writing and rewriting the first image information on the electronic paper display unit;
• supplying, by an electric-power supply unit, electric power to the display control unit;
• and
• determining, by a determination unit, whether or not the electric power to the display control unit is lower than a threshold, wherein
• when the determination unit determines that the electric power to the display control unit is lower than the threshold, the display control unit saves the first information on the electronic paper display unit into the storage unit, and rewrites the first image information on the electronic paper display unit to the second image information consisting of non-confidential information,
• wherein the electronic paper display apparatus includes a thermoelectric generation unit that does not include a battery, and the method further comprises converting thermal energy provided from a body temperature of a user into electric power upon the user contacting the thermoelectric generation unit, and supplying the electric power to the display control unit as operating power of the display control unit, and
• wherein the method further includes determining, by the determination unit, whether the user is in contact with the thermoelectric generation unit, and when the determination unit determines that the user is not in contact with the thermoelectric generation unit, the display control unit performs a control of rewriting the first image information displayed on the electronic paper display unit with second image information.