Method for reducing power consumption in a portable electronic device with a liquid crystal display screen
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United States of America Patent
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Apr 6, 1999
Issued Date -
N/A
app pub date -
Nov 10, 1997
filing date -
May 18, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for reducing power consumption in a portable electronic device (100) with an LCD screen (104) and operating with a CPU (114) switchable between a high power mode and a low power mode. When input commences on a surface of the LCD screen (104), an interrupt signaler (108) generates a first interrupt signal to an interrupt controller (112). Upon receiving the first interrupt signal, the interrupt controller (112) switches the CPU (114) from the low power mode to the high power mode, turning on at least one detection panel (106) coupled to the LCD screen (104) and to an ADC (110). When input ceases on the surface, the interrupt signaler (108) generates a second interrupt signal to switch the CPU (114) from the high power mode to the low power mode, turning off the at least one detection panel (106) and the ADC (110).
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