Patent ID: 8780089

Claim:
A touch input system, comprising: a stylus, comprising: a main body; a battery module, disposed at the main body; a touch portion, disposed at the main body, when a contact pressure is acted on the touch portion, the touch portion is electrically connected to the battery module by the contact pressure and the touch portion emits a light signal; a magnetic element, fixed to the touch portion; and a magnetic detector, fixed to the main body for detecting a signal from the magnetic element to obtain a variation of a distance between the magnetic element and the magnetic detector, and transforming the contact pressure into an electrical signal based on the variation of the distance; and a RF transmitting module, disposed at the main body, electrically connected to the magnetic detector, and transmitting the electrical signal; and a display device, comprising: a display region, detecting the light signal to locate a touch position when the touch portion is exerted on the display region; and a RF receiving module, electrically connected to the display device and used to receive the electrical signal, wherein the display region receives the electrical signal via the RF receiving module, and the display region displays a line width according to the electrical signal.