US Patent 9448643 Stylus sensitive device with stylus angle detection functionality

Techniques are disclosed for performing functions in electronic devices by changing the angle between a stylus and a stylus detection surface of an electronic device. The stylus and/or device can detect the stylus angle of inclination and any changes in stylus angle. Each uniquely identifiable angle change or combination of angle changes may be associated with a distinct device or stylus function. A greater angle change may result in an accelerated function or a different function entirely. The stylus angle gesture may perform functions on selected content or on one or more UI control features or icons on the device. In other cases, functions can be performed without reference to specific content or control features. The various functions assigned to stylus angle gestures may be performed on an application-specific level or a global device level. An animation can be displayed as the stylus gestures are executed.