Handheld device and power saving method therefor

A handheld device with a display, comprising:

• a processor, electrically connected to a light sensor and a receiver, the light sensor being located next to the receiver;
• wherein said processor is configured to determine whether a phone call event occurs;
• wherein said processor is configured to, when a phone call event has occurred, enable said light sensor to detect an initial ambient brightness value of the handheld device;
• wherein said processor is configured to adopt a first predetermined condition or a second predetermined condition based on said initial brightness value;
• wherein said processor is configured to determine, whether the handheld device is in a handed receiver mode or in a hands-free receiver mode after said phone call event occurs;
• wherein the processor is configured to, when the handheld device is in the handed receiver mode, enable said light sensor to detect a subsequent brightness value and to turn off the display based on the subsequent brightness value and the first or second predetermined condition;
• and
• the processor is configured to, when the handheld device is in the hands-free receiver mode, control the display based on the settings for the hands-free receiver mode.