Computer screen control circuit

The utility model discloses a computer screen control circuit, including rectifier, photo resistance, controlling resistor, optoelectronic coupler and power drive circuit, the first input end of rectifier and second input insert adjustable AC source the first output of rectifier with photo resistance one end is connected, the second output ground connection of rectifier, the photo resistance other end with controlling resistor's one end is connected, controlling resistor's other end ground connection, the photo resistance with optoelectronic coupler's first input end is connected, optoelectronic coupler's second input ground connection, optoelectronic coupler's first output with power drive circuit connection, optoelectronic coupler's second output ground connection. The utility model provides a computer screen control circuit can be according to screen light intensity's change, adjusts the light intensity of screen in real time, adjusts nimble controllablely, can adapt to everyone actual screen comfort level