Patent ID: 8917262

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, wherein 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 emits a light signal continuously, when the touch portion is distant from the operation surface, the touch portion is recovered; a transducer module, disposed at the main body and not electrically connected with the touch portion, wherein the contact pressure is transformed into an electrical signal by the transducer module, and the electrical signal is directly proportional to the contact pressure and a RF transmitting module, disposed at the main body, electrically connected to the transducer module, 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 region and detecting the electrical signal within a predetermined frequency range, 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, wherein the transducer module comprising: a light emitting element, fixed to the touch portion; and a light detector, fixed to the main body and suitable for detecting a variation of a distance between the light emitting element and the light detector.