Patent ID: 8330778
Filing Date: 2012-12-11
Classification: G09G

Abstract:
1. A monitor comprising: a microprocessor; a switch control unit; an infrared sensor; a switch detecting unit to receive a system voltage, and send the system voltage to the microprocessor; wherein when the microprocessor detects the presence of the system voltage, the microprocessor outputs a first control signal to the switch control unit to control the monitor to be turned on, wherein when the microprocessor detects the system voltage not being present, the microprocessor outputs a second control signal to the switch control unit to control the monitor to be turned off; a display control unit; and a brightness detecting unit to detect an environment brightness state around the monitor and send the environment brightness state to the microprocessor; wherein the microprocessor compares the received environment brightness state output from the brightness detecting unit with a current brightness state of the monitor output from the display control unit, and outputs a brightness control signal to the display control unit to regulate the brightness of the monitor; wherein the switch detecting unit comprises a first capacitor, a field effect transistor (FET), a diode, an amplifier, and first to sixth resistors, wherein a first input/output pin of the microprocessor is grounded via the first capacitor, connected to the system voltage via the first resistor, and connected to the drain of the FET, the source of the FET is grounded, the second resistor is connected between the first input/output pin of the microprocessor and the source of the FET, an anode of the diode is connected to the source of the FET, a cathode of the diode is connected to the drain of the FET, the gate of the FET is connected to an output terminal of the amplifier, a voltage terminal of the amplifier is connected to an inside power of the monitor, the third and the fourth resistors are connected in series between the voltage terminal of the amplifier and ground, a non-inverting input terminal of the amplifier is connected to a node between the third resistor and the fourth resistor, an inverting input terminal of the amplifier is connected to a first pin of the infrared sensor and grounded via the fifth resistor, a ground pin of the amplifier is connected to a second pin of the infrared sensor and ground, a third pin of the infrared sensor is connected to the voltage terminal of the amplifier via the sixth resistor.