ELECTRONIC APPARATUS AND METHOD OF CONTROLLING THE SAME
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United States of America Patent
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Sep 6, 2017
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Sep 9, 2016
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Abstract
A backlight control unit applies to a backlight of a display a backlight current based on a pulse-width modulation signal. A touch panel control unit detects rising and falling edges of the PWM signal, applies a capacity detection signal to a touch panel during an on-period or off-period of the backlight current, and detects a touch operation on the touch panel 19. The touch panel control unit calculates the presence/absence and coordinates of a touch operation from sensor output signals from the touch panel.
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