Patent ID: 7969211
Filing Date: 2011-06-28
Classification: G05F,G06F,G09G

Abstract:
1. A power detecting device, adapted to detect a power voltage provided to a display device, comprising: a bandgap voltage generating circuit, driven to operate according the power voltage for providing a reference voltage via an output terminal of the bandgap voltage generating circuit; a voltage regulating circuit, coupled to the output terminal of the bandgap voltage generating circuit to provide a current path to charge the output terminal of the bandgap voltage generating circuit when the power voltage does not reach a threshold voltage, wherein the voltage regulating circuit comprises: a comparing unit, generating a control voltage according to a comparison result between the power voltage and the threshold voltage; and a switching unit, having a first terminal and a second terminal respectively coupled to the power voltage and the output terminal of the bandgap voltage generating circuit and conducting the first terminal of the switching unit to the second terminal of the switching unit according to the control voltage to provide the current path; and a power-on reset circuit, coupled to the output terminal of the bandgap voltage generating circuit for generating a reset signal to reset the display device when the power voltage reaches the reference voltage.