Patent ID: 8350837
Filing Date: 2013-01-08
Classification: G06F

Abstract:
1. A power monitoring and control apparatus for a display device, the apparatus comprising: a signal receiving unit that receives a display signal from an information processing device; a power conversion unit that converts alternating current power into direct current power; a voltage control unit that produces direct voltages based on the direct current power; a detection unit that detects whether or not a first potential is greater than a second potential, the first potential being a potential at a first point which the power conversion unit and the voltage control unit are connected at and a first power voltage is supplied to when an external power source and the power conversion unit are connected, the second potential being a potential at a second point which the voltage control unit and the signal receiving unit are connect at and a second power voltage is supplied to when the external power source and the power conversion unit are connected; and an HPG control unit that switches states of an HPG signal transmitted to the information processing device, between a first state of the HPG signal when the first potential is greater than the second potential and a second state when the first potential is equal or smaller than the second potential, wherein when the detection unit detects an abnormal current flowing due to a potential difference between the first power voltage and the second power voltage, the abnormal current flowing from the information processing device to the signal receiving unit when the direct current power is not supplied, and the abnormal current not contributing to transmission of the display signal, and the HPG control unit transmits a first HPG signal indicating that supply of the direct current power voltage is stopped; and when the detection unit detects no abnormal current, the HPG control unit transmits a second HPG signal indicating that the direct current power voltage is supplied.