| 摘要 |
A portable electronic instrument (e.g. a mobile phone) having a display screen 105 on the front face of the device, and a pointing device 109 located opposite to this on the rear face. Actioning the pointing device (which may be a touchpad 109, trackball or joystick) moves a graphic pointer 106 on the screen. The positioning device may be located on a detachable battery pack or module on the rear of the instrument, so that no modification of the instrument body is needed to incorporate the pointer. Thus the instrument body can be adapted for different needs by changing type of pointer. The pointing device can be used with the screen of the instrument itself or with the screen of another device connected to the instrument (410, figure 4). |
