Patent ID: 6178513
Filing Date: 2001-01-23
Classification: G06F,G09G,H04N

Abstract:
A power control apparatus in a display unit having a universal serial bus (USB) hub, the apparatus comprising:microcomputer means for producing a control signal for selectively switching a power management state to an OFF mode and to a normal mode according to off and on operation, respectively, of a digital switch;power supply means for supplying power to circuits in the display unit; andswitching means for switching power supply to a deflection circuit and a video circuit according to the control signal from the microcomputer means;wherein the power to the display unit is switched using the digital switch and a predetermined voltage is continuously supplied to the microcomputer means, even in an OFF state of the display unit; andwherein said microcomputer means selectively forwards the control signal to the switching means according to existence and non-existence of at least one of a sync signal, a display data channel (DDC) signal and a USB signal received from a computer and according to a type of said at least one of a sync signal, a DDC signal and a USB signal.