| 摘要 |
PROBLEM TO BE SOLVED: To provide a portable telephone apparatus in which the operating time of a built-in battery is made longer by turning on only the backlight of a required portion in accordance with an application to be operated. SOLUTION: When the application is operated, a control section indexes a table specifying validness and invalidness of an operating key corresponding to the application in a memory (step 31). In a case where it is detected that any one of operating sections is operated (step 32), the control section starts to turn on the backlight (step 33). Before the lapse of a turning-on time set by the timer of the control section, operation is detected again and whether it is a valid key or not is decided (step 34). When it is the valid key, a first backlight for illuminating the most neighboring part of the valid key and a second back light for illuminating a display section are continuously turned on until the lapse of the turning-on time set by the timer (step 35). After the lapse of the turning-on time set by the timer, however, the backlights are turned off (step 36). COPYRIGHT: (C)2009,JPO&INPIT
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