Stylus and touch input system
A touch input system including a stylus and a display device is provided. The stylus includes a battery module, a touch portion, a transducer module and a RF transmitting module. 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. The display region receives and reacts to the light signal, and the contact pressure is transformed into an electrical signal by the transducer module. The RF transmitting module is electrically connected to the transducer module and transmitting the electrical signal. The display device includes a display region and a RF receiving module.
1. A touch input system, comprising:
a stylus, comprising:
a pipe, having a front end, a back end opposite to the front end and an opening formed at the front end, wherein a diameter of the opening is smaller than a diameter of the pipe;
a battery module, disposed within the pipe;
a touch portion, sliding disposed at the opening and having an emitting element, wherein at least a part of the touch portion is located in the pipe;
a detector, disposed between the battery module and the touch portion, and used to detect a signal from the emitting element to obtain a variation of a distance between the touch portion and the detector;
a protrusion, disposed within the pipe; and
a switch element, fixed and electrically connected to the touch portion, and has an elastic element, wherein the touch portion is driven to move toward the back end by an exertion force, the switch element is pushed forward to contact the protrusion for actuating the touch portion to emit a light signal, and the elastic element is compressed between the touch portion and the protrusion; 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, wherein the display region displays a line width according to the variation of the distance detected by the detector.
2. The touch input system as claimed in claim 1 , wherein the protrusion is an elastic member.
3. The touch input system as claimed in claim 1 , wherein the display device further comprising:
a light sensor array, arranged in a pixel electrode array of the display region.
4. The touch input system as claimed in claim 1 , wherein the detector is suitable for detecting a contact pressure applied to the touch portion and transmitting an electrical signal according to the variation of the distance.
5. The stylus as claimed in claim 4 , wherein the electrical signal provides information for magnitude of the contact pressure.
6. The stylus as claimed in claim 4 , further comprising:
a RF transmitting module, disposed within the pipe, electrically connected to the detector, and transmitting the electrical signal.
7. The stylus as claimed in claim 4 , wherein the display region displays a line width according to the electrical signal.
8. The stylus as claimed in claim 6 , wherein the display device further comprises:
a RF receiving module, electrically connected to the display device and used to receive the electrical signal.
9. The stylus as claimed in claim 8 , wherein the display region receives the electrical signal via the RF receiving module.