Stylus and control method thereof

A control method for providing a tilt angle information of a stylus on a touch screen with a touch controller, which the stylus includes a first electrode at a tip of the stylus, a second electrode surrounding the first electrode, a third electrode surrounding the second electrode, and a control module, wherein the first electrode and the third electrode are not electrically coupled, the second electrode and the third electrode are not electrically coupled, the control method comprising:

• rendering a first projection area on the touch screen by the stylus during a first time period via the control module instructing the first electrode and the second electrode to emit a first-time-period electrical signal, and the third electrode to connect to a DC voltage or ground potential;
• and
• rendering a second projection area on the touch screen by the stylus during a second time period via the control module instructing the first electrode and the second electrode to emit a second-time-period electrical signal, and the third electrode to be floated and to be induced by the second-time-period electrical signal;
• wherein the tilt angle information is determined by comparing the first projection area and the second projection area, and then calculating a projection vector of the stylus.

A stylus for providing a tilt angle information on a touch screen, comprising:

• a first electrode at a tip of the stylus;
• a third electrode surrounding the first electrode;
• a second electrode surrounding the third electrode, wherein the first electrode, the second electrode and the third electrode are not electrically coupled, the third electrode is connected to ground potential for shielding the first electrode and the second electrode;
• and
• a control module connecting the first electrode and the second electrode, wherein the control module instructs the first electrode to emit a first-time-period electrical signal during a first time period for rendering a first projection area corresponding to the first electrode on the touch screen, and instructs the first electrode and the second electrode to emit a second-time-period electrical signal during a second time period for rendering a second projection area corresponding to the first electrode and second electrode on the touch screen;
• wherein the tilt angle information is determined by comparing the first projection area and the second projection area, and then calculating a projection vector of the stylus.

A control method for providing a tilt angle information of a stylus on a touch screen with a touch controller, which the stylus includes a first electrode as a stylus tip, a third electrode surrounding the first electrode, and a second electrode surrounding the third electrode, wherein the first electrode, the second electrode and the third electrode are not electrically coupled, and the third electrode is connected to ground potential for shielding the first and second electrodes, the control method includes:

• having the first electrode emitting a first-time-period electrical signal during a first time period for rendering a first projection area corresponding to the first electrode on the touch screen;
• and
• having the first electrode and the second electrode emitting a second-time-period electrical signal during a second time period for rendering a second projection area corresponding to the first electrode and the second electrode on the touch screen;
• and
• determining the tilt angle information by comparing the first projection area and the second projection area, and then calculating a projection vector of the stylus.