System and method for reduced standby power consumption in a display device

A method for power mode switching between a main mode and a standby mode of a display device, said method comprising the steps of:

• a) receiving an input power signal from a power source and generating output power signals therefrom using a power supply unit when said display device is in said main mode;
• b) monitoring a sync signal originating from a computer using an opto coupler;
• c) selectively sending an OFF signal from said opto coupler to said power supply unit when said opto coupler does not detect said sync signal from said computer for a predetermined time period;
• d) shutting down said power supply unit to stop generating said output power signals in response to said OFF signal to switch said display device to said standby mode;
• e) receiving one of said output power signals from said power supply unit using a microprocessor for controlling said display device;
• and
• f) powering off said microprocessor upon said display device entering said standby mode.

A circuit for power mode switching between a main mode and a standby mode of a display device, said circuit comprising:

• a power supply means for receiving an alternating current (AC) input power signal from a power source and for generating direct current (DC) output power signals when said display device is in said main mode;
• an opto coupler means responsive to a sync signal from a computer, wherein said opto coupler mean is also coupled to said power supply means for selectively sending an OFF signal thereto when said opto coupler means does not detect said sync signal from said computer for a predetermined time period while said display device is in said main mode and also for selectively sending an ON signal thereto when said opto coupler detects said sync signal from said computer while said display device is in said standby mode;
• a microprocessor means coupled to receive one of said DC output power signals from said power supply means and for controlling said display device, wherein said microprocessor means is powered off while said display device is in said standby mode;
• and
• wherein said power supply means shuts down and stops generating said DC output power signals in response to said OFF signal to switch said display device to said standby mode.

A circuit for switching between a main power mode and a standby power mode of a display device, said circuit comprising:

• a power supply unit configured to receive an input power signal from a power source and for generating output power signals when said display device is in said main power mode;
• an opto coupler responsive to a sync signal from a computer, wherein said opto coupler is also coupled to said power supply unit and configured to selectively send an OFF signal thereto when said opto coupler does not detect said sync signal from said computer for a predetermined time period;
• wherein said power supply unit switches said display device to said standby power mode to stop generating said output power signals in response to said OFF signal;
• a zener diode coupled between a collector terminal of a phototransistor of said opto coupler and ground;
• and
• a first resistor coupled between said zener diode and said power source.

A method for power mode switching between a main mode and a standby mode of a display device, said method comprising the steps of:

• a) receiving an input power signal from a power source and generating output power signals therefrom using a power supply unit when said display device is in said main mode;
• b) monitoring a sync signal originating from a computer using an opto coupler;
• c) selectively sending an OFF signal from said opto coupler to said power supply unit when said opto coupler does not detect said sync signal from said computer for a predetermined time period;
• and
• d) shutting down said power supply unit to stop generating said output power signals in response to said OFF signal to switch said display device to said standby mode and wherein said input power signal is substantially a 230 volts alternating current (AC) signal and wherein said circuit consumes power at a rate of less than 1 watt while said display device is in said standby mode.

A circuit for switching between a main power mode and a standby power mode of a display device, said circuit comprising:

• a power supply unit configured to receive an input power signal from a power source and for generating output power signals when said display device is in said main power mode;
• an opto coupler responsive to a sync signal from a computer, wherein said opto coupler is also coupled to said power supply unit and configured to selectively send an OFF signal thereto when said opto coupler does not detect said sync signal from said computer;
• wherein said power supply unit switches said display device to said standby power mode to stop generating said output power signals in response to said OFF signal;
• and
• a microprocessor coupled to receive one of said output power signals from said power supply unit configured to control said display device, wherein said microprocessor is powered off while said display device is in said standby power mode.