US Patent 7924555 Portable electronic device

A portable electronic device includes a shell, a control circuit, a display panel and at least a bi-stability display module. The shell has an opening and an accommodating cavity in two different surfaces. The control circuit includes a first information transmission unit. The control circuit and the display panel are disposed in the shell. The display panel is electrically connected to the control circuit. The display panel has a display surface exposed from the opening. The bi-stability display module is detachably disposed in the accommodating cavity and selectively electrically connected to the control circuit. The bi-stability display module includes a second information transmission unit for communicating with the first information transmission unit and a bi-stability display for displaying the information received by the second information transmission unit. The bi-stability display module can display when the control circuit is closed. The power-consumption of the portable electronic device may be decreased.