Handwritten input system with pressure detecting function

Abstract

A handwritten input system with the pressure detecting function comprises a handwriting pen, a pressure detecting unit and a control unit, wherein the handwriting pen comprises a pen point; the pressure detecting unit can output a detection signal along with stress change of the pen point; the detection signal generates input minimum under first pressure and input maximum under second pressure; the control unit is provided with a conversion program, output minimum corresponding to the first pressure, output maximum corresponding to the second pressure, the input minimum and the input maximum; and when applying force to the pen point to generate an input value between the input minimum and the input maximum, the conversion program can generate an output value between the output minimum and the output maximum as a pressure value. The system can correct the errors caused by pressure detecting components or related circuits and specify the output pressure value in the same standard interval.

Description

technical field [0001] The invention relates to a handwriting input system, in particular to a handwriting input system with pressure detection function. Background technique [0002] Such as figure 1 As shown, the general handwriting input system 100 mainly includes a touch panel 11, a stylus 12, and a control unit 13 electrically connected to the touch panel 11 and the stylus 12, the handwriting input system 100 is connected to the computer In addition to use, there is also a form that is directly integrated on a computer screen such as a tablet computer. When the stylus 12 touches the touchpad 11, the touchpad 11 can detect a coordinate signal, and the stylus 12 can be used for A pressure signal is output according to the magnitude of the force during contact, and the coordinate signal and the pressure signal are transmitted to the control unit 13 in a wired manner through the touch panel 11 and the stylus 12 respectively, and are processed by the control unit 13 , calc...

AI Technical Summary

Problems solved by technology

[0003] However, the pressure detection elements used for pressure detection in each stylus still have their own errors in characteristics. When the control unit 13 lacks the function of adjusting the error, each stylus calculates and generates The pressure output value is not in the same standard range, so that it will affect the function presentation of the application software

[0004] In addition, transmission by wire will still increase user inconvenience, especially when using the stylus 12, the wire used for transmission will often hinder the freedom of writing. In addition, since the control unit 13 needs to process the coordinate signal The pressure signal is processed, so it is easy to cause the disadvantages of more time-consuming processing, delayed output signal, and difficult balance between the two.

[0005]Another type of stylus that does not need to use transmission wires is the use of electromagnetic coupling technology. When the stylus detects different forces, the stylus The frequency of electromagnetic coupling between the induction antenna and an induction antenna changes to present different force levels. The induction antenna is usually located on a touch panel. Although the degree of freedom of writing can be increased through electromagnetic coupling, the stylus and The distance between the touchpad must be within 1cm to 3cm, otherwise electromagnetic coupling cannot occur, so once the stylus leaves the touchpad, it will lose its function and cannot be used independently or in conjunction with other devices. In addition, the stylus outputs The frequency change needs to be achieved by adjusting the inductance or capacitance, so it is more difficult to design and manufacture

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