The tablet computer transformer includes an external extension display. An extension interface is coupled to the extension display; an extension display is coupled to the control unit through the extension interface for displaying video or image from the portable communication device. It has to be noted that the portable communication device is a separated device from the external extension display when the portable communication device disconnects from the external extension display and is transformed into a tablet or pad computer when the portable communication device connects to the external extension display. The command, instruction and signal transfer are made through the extension interface. The displayed video or image is processed by the portable communication device and is displayed by the external extension display, thereby transforming the portable communication device to the tablet or pad computer after the cellular is integrated into the tablet computer transformer.