El backlight maintenance system for portable terminal

Abstract

PURPOSE: To judge the exchange time of an EL(electroluminescence) backlight beforehand and to early comply with the exchange by counting the lighting time of the EL backlight and comparing it with a previously set threshold. CONSTITUTION: When the EL backlight 4 is turned on, time is read out from a calendar IC 5 and temporarily stored, and the time is read out also when the backlight 4 is turned off so as to calculate the difference of time. An EL backlight control task 1 sets the difference as the value of EL backlight lighting time, and an EL backlight lighting time counting processing part 2 adds the value of the EL backlight lighting time and a value stored in an EL backlight lighting time counting area 3 and stores the obtained value in the area 3. An operating system for a portable terminal 9 displays a maintenance message when the value stored in the area 3 becomes larger than the threshold at the time of starting a system. Thus, the accurate maintenance is accomplished. COPYRIGHT: (C)1992,JPO&Japio

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Cited By (2)

    Publication numberPublication dateAssigneeTitle
    US-8330703-B2December 11, 2012Dell Products, LpSystem and method of boosting lamp luminance in a laptop computing device
    US-9524680-B2December 20, 2016Dell Products, LpSystem and method of boosting lamp luminance in a laptop computing device