| 摘要 |
When the amount of remaining battery power is limited, the battery life can be extended while established functions can be maintained sufficiently available. A battery remaining power amount monitoring portion 4 monitors the amount of battery power remaining. On lighting the backlight within a liquid crystal display 1, when a controlling portion 6 determines that the amount of remaining battery power is higher than a predetermined level, based on the result of monitoring in the battery remaining power amount monitoring portion 4, the controlling portion 6 causes a desired light emitting element to emit light. However, when the controlling portion 6 determines that the amount of remaining battery power is lower than the predetermined level, it causes a light emitting element operable with a lower power consumption to emit light, thereby saving power consumption. With multiple-color light emitting elements, when the battery is low light emitting elements of a selected color operable with lower power consumption are used. |
