A mobile phone of energy-saving type is prepared as setting liquid crystal screen for displaying operation state of phone and operation information on display module, setting back light module on main body and making position of back light module and display module be opposite to each other when display module is coincided with main body, setting display module and light collecting module separately on two sides of main body in rotary mode, setting light focusing unit on light collecting module for focusing light from outside and using control module to control operation state of back light module. |