Portable electronic device with orientation sensor

A portable electronic device, comprising:

• a main body comprising a top surface and a bottom surface at opposite sides thereof;
• a display screen formed on the main body at the top surface for displaying an image in an original orientation;
• and
• an orientation sensor mounted on the main body at the top surface, the orientation sensor comprising:
• a ring-shaped container comprising a first surface and an opposite second surface both in parallel with the display screen, the first surface facing the top surface, the first the ring-shaped container having an opaque liquid and a gas bubble sealed therein;
• a detection assembly including at least one light source arranged on the first surface of the ring-shaped container, and a plurality of spaced light detection elements arranged on the second surface of the ring-shaped container, the gas bubble being movable in the ring-shaped container in response to variation of posture of the display screen and configured for allowing transmission of light from the at least one light source therethrough, each of the light detection elements being configured for sensing the light transmitted through the gas bubble and outputting a sensing signal;
• and
• a display controlling module for deviating the displayed image at a given angle clockwise or counterclockwise from the original orientation of the image based on the sensing signals.