Patent ID: 6297601
Filing Date: 2001-10-02
Classification: G09G

Abstract:
An electric power-saving apparatus for a display system for providing an electric power-saving mode as an off mode through a reduction of electric power consumed in an entire system when horizontal and vertical synchronization signals are not inputted from a computer main body during a predetermined time period, comprising:an electric power supply control part for selectively generating a pulse width modulation (PWM) pulse of a PWM circuit section in response to a received electric power supply control signal;an operational voltage supply part for generating an operational voltage, wherein the operational voltage supply part is charged with energy induced in a secondary winding of a switching transformer when the PWM pulse is generated by the PWM circuit section under control of the electric power supply control part, and wherein commercial electric power is supplied to a primary winding of the switching transformer and the operational voltage supply part is discharged when the PWM pulse is not generated by the PWM circuit section under the control of the electric power supply control part; anda microcomputer driven based on the operational voltage generated by the operational voltage supply part for switching the entire system into the off mode when the horizontal and vertical synchronization signals are not inputted from the computer main body, and for outputting the electric supply control signal to the electric power supply control part as soon as a remaining voltage of the operational voltage supply part becomes lower than a minimum value of an input compensation voltage of the operational voltage supply part when the operational voltage supply part is discharged.