Patent ID: 8786564

Claim:
A touch stylus, comprising a stylus tip and a stylus body, wherein, the stylus tip is connected to the stylus body, the stylus body is provided with a cavity in which a driving circuit board and a battery are arranged, the driving circuit board is electrically connected to the stylus tip, the battery is adapted to supply electrical energy to the driving circuit board, and the driving circuit board is adapted to generate a square wave signal and send the square wave signal to a touch detection system through the stylus tip, so that the touch detection system determines whether a touch event occurs according to the square wave signal; wherein the touch stylus has a clock synchronized with a clock of a sensing detection unit of the touch detection system; wherein the driving circuit board comprises a crystal oscillator, a first voltage boosting circuit, a second voltage boosting circuit, and a level converter, wherein the first voltage boosting circuit is connected to the battery, the battery being adapted to supply electrical energy to the first voltage boosting circuit; the first voltage boosting circuit is connected to the crystal oscillator, and adapted to supply electrical energy to the crystal oscillator; the second voltage boosting circuit is connected to the first voltage boosting circuit and the level converter, and adapted to supply electrical energy for the level converter; and the level converter is connected to the crystal oscillator, and adapted to perform level conversion on a square wave signal output by the crystal oscillator and send a result to the stylus tip.