TW201635099A - Active stylus and correcting method of position information thereof - Google Patents

Abstract

The present invention relates to an active Stylus and correcting method of position information of the active stylus. The active stylus has a body, a first electrode mounted on a front of the body to radiate an exciting signal and a second electrode electrically isolated from the first electrode and not to radiate the exciting signal. The correcting method uses a capacitive touch device to detect a position of the first electrode, and then to detect a position of the second electrode if the position of the first electrode is detected. The correcting method further calculates a real position of the active stylus touched on the capacitive touch device by correcting the position of the first electrode according to the position of the second electrode.

Description

Active stylus and its position information correction method

The invention relates to a method for detecting an active stylus coordinate, in particular to an active stylus and a nib coordinate correction method thereof.

The active stylus 50 is used in conjunction with a capacitive touch device 60. The active stylus 50 is provided with a stimulation signal generating circuit 51 and is electrically connected to a conductive tip 52. . As shown in FIG. 7 , the capacitive touch device 60 includes n first direction electrodes 61 and m second direction electrodes 62 , and the conductive pen tip 52 of the active stylus pen 50 approaches or touches the When the capacitive touch device 60 is used, the stimulation signal generating circuit 51 transmits a stimulation signal through the conductive pen tip 52. When the capacitive touch device 60 scans the first and second direction electrodes 61 and 62, the conductive device is close to the conductive device. The capacitance inductive amounts of the first direction electrodes 61 and the second direction electrodes 62 of the pen tip 52 change.

8A and 8B, the capacitance sensing amounts of the first direction and second direction electrodes 61, 62 are as shown in the figure, wherein the capacitances of the first direction electrode X _i and the second direction electrode Y _j are as shown in the figure. The amount of induction varies the most. The conductive pen tip 52 of the active stylus pen 50 is directly touched by the capacitive touch device 60, so the conductive pen tip 52 and the first adjacent to the first direction electrode X _i and the second direction electrode Y _j Coupling capacitance between the direction and the second direction electrodes X _i-2 , X _i-1 , X _i+1 , X _i+2 , Y _j-2 , Y _j-1 , Y _j+1 , Y _j+2 C _x1 ~C _x4 and C _y1 ~C _y4 will And have Therefore, the capacitive touch device 60 can determine that the coordinate information of the conductive pen tip 52 is (X _i , Y _j ).

However, as shown in FIG. 9, when the user uses the active stylus 50 on the capacitive touch device 60, the conductive pen tip 52 is generally not as shown in FIG. 6 due to the user's writing habits. The touch is directly touched on the capacitive touch device 60. Therefore, as shown in FIGS. 10, 11A and 11B, the distance between the first direction and the second direction electrodes 61, 62 and the side faces in different directions of the conductive tip 52 may be used because of the tilt of the conductive tip 52. The spacing on one side becomes larger, but the spacing on the other side becomes smaller. On the side where the distance becomes smaller, the coupling capacitances C _x2 , C _x4 and C _y2 , C _y4 become larger; otherwise, the distance becomes larger On the side, the coupling capacitances C _x1 , C _x3 and C _y1 , C _y3 become smaller; as shown in FIG. 10 , the inclined state of the conductive nib 52 causes the conductive nib 52 and the first and second direction electrodes 61 , The relationship between the coupling capacitances C _x1 ~ C _x4 and C _y1 ~ C _y4 between 62 changes to: And have . Therefore, the capacitive touch device 60 determines that the coordinate information P1 of the conductive pen tip 52 is (X _i+1 , Y _j+1 ). Therefore, it is determined that the coordinates of the conductive pen tip 52 in the tilted state have deviated from the actual touch. The coordinate information P(X _i , Y _j ) of the position.

Since the conductive pen tip 52 has different inclination angles with the capacitive touch device 60 with different users or different holding postures, it is necessary to determine the deviation of the coordinate information P of the conductive pen tip 52 due to the tilt angle. The problem is further improved.

In view of the above technical defects that the active stylus coordinate information is judged to have errors, the main object of the present invention is to provide an active stylus and a position information correction method thereof to overcome the technical defects.

The main technical means used to achieve the above purpose is that the active stylus includes: a main body; a stimulation signal generating circuit is disposed in the main body for outputting a stimulation signal; and a first electrode is corresponding to The first electrode is coupled to the stimulation signal generating circuit for transmitting the stimulation signal, and a second electrode unit is disposed on the body and has a relationship between the first electrode and the first electrode. a distance, wherein the second electrode unit is electrically insulated from the first electrode and does not emit the stimulation signal.

The active stylus is configured to transmit a stimuli signal to a touch device through the first electrode, and the touch device detects the position information thereof. The touch device can also detect the second electrode unit. The position information of the first electrode is corrected according to the position information of the second electrode unit, and the first electrode of the active stylus is actually touched by the touch device. Location information on.

The main technical means used to achieve the above purpose is to modify the position information method, including the following steps: (a) performing a first stylus scanning program to detect a stylus and obtaining a corresponding stylus a first location information; (b) performing a second stylus scanning process to obtain a second location information in the vicinity of the first location information; and (c) performing calculations based on the first and second location information, Obtain the position information corrected by the stylus.

When the first electrode of the active stylus actually touches the touch device, the touch device detects and obtains the first electrode and the second electrode unit by using the first and second stylus scanning programs, respectively. Position information; the touch device can correct the position information of the first electrode according to the position information of the second electrode unit, and obtain the first electrode of the active stylus to actually touch the touch Location information on the device.

The present invention is directed to a method for correcting the position information of the active stylus when the active stylus is used for tilting in a capacitive touch device.

Referring to FIG. 1A , a preferred embodiment of the active stylus 10 of the present invention includes a main body 101 , a stimulation signal generating circuit 11 , a first electrode 12 , and a second electrode unit . 20.

The main body 101 has a cylindrical shape for the user to use by hand. The stimulation signal generating circuit 11 is configured to generate and output a stimulation signal, and the stimulation signal can be a pulse signal or a string signal. The stimulation signal generating circuit 11 is connected to a button 111. The button 111 is disposed outside the main body 101 for the user to press to control the application of the stimulation signal generating circuit 11 to open, close or other functional modes.

The first electrode 12 is disposed at a front end of the main body 101 and used as a nib of the active stylus pen 10. The first electrode 12 is coupled to the stimulation signal generating circuit 11 for transmitting the stimulation signal.

The second electrode unit 20 is disposed on the main body 101 and has a distance from the first electrode 12, and the second electrode unit 20 is electrically insulated from the first electrode 12, and the second electrode unit 20 does not emit the stimulus signal. In one embodiment, the second electrode unit 20 is a conductive ring disposed outside the body 101 and adjacent to the first electrode 12 . The main body 101 is provided with a conductor portion 102, and the conductor portion 102 is electrically connected to the second conductive unit 12, so that the second electrode unit 20 can pass through the conductor portion 102 and the human body. The medium forms ground with the earth EGND. Alternatively, as shown in FIG. 1B, the second electrode unit 20' may also be coupled to the ground GND of the stimulation signal generating circuit 11 or a fixed potential V+, thereby forming another grounding type. However, the grounding manner of the second conductive unit 12 is not limited to the foregoing two embodiments, and other grounding methods are also within the scope of protection of the present invention. Therefore, when the user holds the active stylus 10 by hand, the second conductive unit 20 can be connected to the ground EGND through the conductor portion 102. In addition, as shown in FIG. 1B , the second electrode unit 20 ′ may further include a plurality of sensing electrodes 201 arranged on the outer side of the main body 101 in an annular equidistant manner.

Referring to FIG. 2 , the capacitive touch device 30 includes n first direction electrodes 301 and m second direction electrodes 302 . The first direction electrodes 301 are interlaced with the second direction electrodes 302 . Settings. The capacitive touch device 30 further includes a control unit 31. The control unit 31 is electrically connected to the first direction electrode 301 and the second direction electrode 302 for determining the coordinate information of the touch object. For example, the control unit 31 detects the sensing signals of the first direction electrode 301 and the second direction electrode 302 (change in the capacitance sensing amount), and then determines the coordinate information of the touch object. The control unit 31 includes a finger scanning program, a first stylus scanning program, and a second stylus scanning program, wherein the control unit 31 has a first mode and a second mode, when no object touches or approaches the In the capacitive touch device 30, the control unit 31 performs the finger scanning process and the first stylus scanning program in the first mode to detect whether an object touches or approaches the capacitive touch device 30. Moreover, when the capacitive touch device 30 detects that the stylus touches or approaches in the first mode, the control unit 31 switches to the second mode, and in the second mode. Corresponding to executing the first stylus scanning program and the second stylus scanning program.

In the first mode, the control unit 31 first executes the finger scanning program S _finger and the first stylus scanning program S _stylus as shown in FIG. 3A and FIG. 3B; wherein the finger scanning program S _finger is used for The finger coordinate information is detected and judged, and the first stylus scanning program S _stylus is used to detect and judge the coordinate information of the tip of the active stylus pen 10. When no finger or active stylus approaches or touches the capacitive touch device, the control unit 31 repeatedly executes the finger scanning program S _finger and the first stylus scanning program S _stylus . Referring to FIG. 3A again, it is a timing diagram of the control unit 31 for executing the finger scanning program S _finger and the first stylus scanning program S _stylus , that is, alternating in a cycle time D1 and D2. The finger scanning program S _finger and the stylus scanning program S _{stylus are} executed. As shown in FIG. 3B, the control unit 31 can execute the plurality of finger scanning programs S _finger after executing the plurality of _stylus scanning programs S _stylus in the cycle time D1 and D2. The cycle time D1, D2 may be a cycle time corresponding to the stimulation signal of the active stylus 10 to ensure that the touch of the active stylus 10 is detected in time.

The finger scanning program S _finger can be a self-capacitance scanning program or a mutual capacitance scanning program. The self-capacitance scanning program sequentially outputs a driving signal to the first direction and second direction electrodes 301 and 302 by the control unit 31, and after driving the driving signal, the first direction or the first driving direction is driven. The two-direction electrodes 301, 302 receive their own self-capacitance inductance. The mutual capacitance scanning program is that the control unit 31 sequentially outputs a driving signal to the first direction electrodes 301, and receives the mutual capacitance sensing amount from the second direction electrodes 302 after outputting the driving signals for each time; or The control unit 31 sequentially outputs a driving signal to the second direction electrodes 302, and receives the mutual capacitance sensing amount from the first direction electrodes 301 after outputting the driving signals.

As shown in FIG. 1A, in this embodiment, the first electrode 12 of the active stylus 10 emits a stimulation signal, and the control unit 31 does not have a pair when executing the first stylus scanning program S _stylus . The first direction and second direction electrodes 301 and 302 output driving signals, and only receive capacitive sensing amounts of the first direction and second direction electrodes 301 and 302, respectively. Therefore, the control unit 31 executes the stylus scanning program S _stylus time less than each time the finger scanning program S _{finger is} executed, as shown in FIGS. 3A and 3B.

Referring to FIG. 1A , FIG. 2 and FIG. 4A , the capacitive touch device 30 is used to correct the coordinate information P of the tip of the active stylus pen 10 . As shown in FIG. 4A, the active stylus 10 touches the capacitive touch device 30 during the first cycle time D1, and is detected by the first stylus scanning program S _stylus after the touch time. It is known that after detecting the active stylus 10, the control unit enters the second mode from the first mode. The active stylus 10 emits a stimulation signal by the first electrode 12, and the control unit 31 can detect and obtain the active stylus 10 according to the capacitive sensing amount of the first direction and the second directional electrode. A first position information P1 of the first electrode 12.

When the capacitive touch device 30 detects that the active stylus 10 is touched or approached, the control unit 31 switches to the second mode and executes the first stylus scanning program S _stylus and The second stylus scanning program _S'stylus (indicated by oblique lines), in the embodiment shown in FIG. 4A, in the second mode, the first stylus scanning program S _stylus and the second stylus The scanning program _S'stylus is alternately executed until the active stylus 10 is far away, and then the first mode is switched back from the second mode, but the execution timing of the two is not limited thereto, and may be other variations. state. The first stylus scanning program S _stylus used to obtain a first position information P1 of the first electrode 12 of the active stylus pen 10 has been detailed in the previous paragraph, and therefore will not be described again. The second stylus scanning program S' _stylus is used to detect the second position information P2 of the second electrode unit 20 of the active stylus pen 10. Since the second electrode unit 20 is connected to the ground GND or the fixed potential terminal V+, when the second electrode unit 20 is close to the capacitive touch device 30, the second electrode unit 20 changes the second electrode unit 20 The capacitive sensing amount of the electrodes 301, 302 in the first direction and the second direction; therefore, the second stylus scanning program _S'stylus can detect and determine the second electrode by a capacitance scanning program or a mutual capacitance scanning program. The second position information P2 of the unit 20.

As shown in FIG. 5A, the active stylus 10 and the capacitive touch device 30 form an oblique angle, and the control unit 31 determines the first electrode by the first stylus scanning program S _stylus. The coordinates of the first position information P1 of 12 are (X _i+1 , Y _j+1 ), and the second position information P2 of the second electrode unit 20 is determined by the second _stylus scanning program S' _stylus which is executed next. The coordinates of (X _i+3 , Y _j+3 ) are ideal. The ideal coordinate P of the first electrode 12 and the coordinates of the first position information P1 and the coordinates of the second bit information P2 may form a straight line. According to the fixed distance of the first electrode 12 and the second electrode unit 20, the control unit 31 can perform the linear extrapolation operation on the first position information P1 and the second position information P2 to obtain the true coordinate P of the first electrode 12 ( X _i , Y _j ). In addition, the control unit 31 can also determine the tilting direction of the active stylus 10 according to the relative position between the coordinates of the first position information P1 and the coordinates of the second position information P2.

In other embodiments, the real coordinate P of the first electrode 12 can be obtained by using the following method. In the second mode, the control unit 31 can perform the second stylus scanning program S' _stylus according to the second mode. The first position information P1 of the first _stylus scanning program S _stylus selects a _plurality of first direction and second direction electrodes X _i-2 ~X _i+4 , Y _j- adjacent to the first position information P1 ₂ ~ Y _j+4 , that is, centering on the first position information P1, selecting the first direction electrode X _{i+1 of} the first position information P1 and the three first direction electrodes X _{i-2 of the} front and the back X _i , X _i+2 ~X _i+4 , and the second direction electrode Y _{j+1 of} the first position information P1 and the three second direction electrodes Y _j-2 ~Y _j , Y _j before and after ₊₂ ~Y _j+4 . The control unit 31 performs a self-capacitance scanning procedure or a mutual capacitance scanning procedure only on the selected first direction and second direction electrodes X _i-2 ~X _i+4 , Y _j-2 ~Y _j+4 Detecting the second position information P2, the number of scanning electrodes is reduced (as shown in the dotted line circle A of FIG. 2); that is, as shown in FIG. 4B, the second stylus scanning program S' _stylus (with a slash) The time indicated is shorter than the time of the second stylus scanning program S' _stylus (marked by oblique lines) shown in FIG. 4A, and the second position information of the second electrode unit 20 can be quickly obtained, thereby obtaining the first The true coordinate P of an electrode 12.

As described above, the active stylus of the present invention mainly sets the second electrode unit near the first electrode, and first detects the first position information of the first electrode of the active stylus, and then detects the initiative. The second position information of the second electrode unit of the stylus is corrected according to the second position information to obtain position information of the active stylus on the touch device. The tilt direction of the active stylus can be further determined.

In different embodiments, the control unit obtains the sensing information of the sensing electrode and transmits it to a processing unit of a host (for example, a tablet computer), and the coordinate unit performs a coordinate operation of the finger or the first position information P1 of the stylus. , the second position information coordinate P2, the operation of the real coordinate P. In a large-sized touch screen, the control unit may include a plurality of touch integrated circuits respectively connected to a part of the sensing electrodes.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the present invention. The present invention has been disclosed by the embodiments, but is not intended to limit the invention, and any one of ordinary skill in the art, In the scope of the technical solutions of the present invention, equivalent modifications may be made to the equivalents of the embodiments of the present invention without departing from the technical scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

10‧‧‧Active stylus
101‧‧‧ Subject
102‧‧‧Conductor Department
11‧‧‧Stimulus signal generation circuit
111‧‧‧ button
12‧‧‧First electrode
20, 20'‧‧‧ second electrode unit
201‧‧‧Induction electrodes
30‧‧‧Capacitive touch device
301‧‧‧First direction electrode
302‧‧‧second direction electrode
31‧‧‧Control unit
50‧‧‧Active stylus
51‧‧‧Stimulus signal generation circuit
52‧‧‧ Conductive nib
60‧‧‧Capacitive touch device
61‧‧‧First direction electrode
62‧‧‧second direction electrode

FIG. 1A is a schematic diagram of a first preferred embodiment of the active stylus of the present invention touching a capacitive touch device. 1B is a schematic view showing a second preferred embodiment of the active stylus of the present invention. 2 is a schematic view corresponding to FIG. 1A of the capacitive touch device of the present invention. 3A is a timing diagram of a scan control of a control unit of the capacitive touch device of the present invention. FIG. 3B is another timing diagram of scan control of the control unit of the capacitive touch device of the present invention. FIG. FIG. 4A is a timing diagram of a scan control of the control unit of the capacitive touch device of the present invention for detecting an active touch device. FIG. FIG. 4B is another timing diagram of scanning control of the control unit of the capacitive touch device of the present invention for detecting an active touch device. FIG. FIG. 5A is a partially enlarged schematic view showing the active stylus of FIG. 1A obliquely touching the capacitive touch device. FIG. 5B is another partially enlarged schematic view showing the active stylus of FIG. 1A obliquely touching the capacitive touch device. Figure 6 is a schematic diagram of an active stylus touching a capacitive touch device. FIG. 7 is a schematic diagram corresponding to FIG. 6 of the existing capacitive touch device. FIG. 8A is a partially enlarged schematic view showing the active stylus pen of FIG. 6 directly touching the capacitive touch device. FIG. 8B is another partially enlarged schematic view of the active stylus pen of FIG. 6 directly touching the capacitive touch device. Figure 9 is a schematic diagram of an active stylus touching a capacitive touch device. FIG. 10 is a schematic diagram corresponding to FIG. 9 of the existing capacitive touch device. FIG. 11A is a partially enlarged schematic view showing the active stylus pen of FIG. 9 directly touching the capacitive touch device. FIG. 11B is another partially enlarged schematic view of the active stylus pen of FIG. 9 directly touching the capacitive touch device.

10‧‧‧Active stylus

101‧‧‧ Subject

102‧‧‧Conductor Department

11‧‧‧Stimulus signal generation circuit

111‧‧‧ button

12‧‧‧First electrode

20‧‧‧Second electrode unit

30‧‧‧Capacitive touch device

Claims (14)

An active stylus includes: a main body; a stimulating signal generating circuit is disposed in the main body for outputting a stimulating signal; and a first electrode is disposed at a front end of the main body, the first electrode system The second signal unit is disposed on the body and has a distance from the first electrode, wherein the second electrode unit is coupled to the stimulation signal generating circuit for transmitting the stimulation signal. An electrode is electrically insulated and does not emit the stimulation signal. The active stylus according to claim 1, wherein the second electrode unit is coupled to a ground or a fixed potential. The active stylus according to claim 1, wherein the main system comprises a conductor portion, and the second electrode unit is connected to the conductor portion. The active stylus according to any one of claims 1 to 3, wherein the second electrode unit is a conductive ring disposed on the body. The active stylus according to any one of claims 1 to 3, wherein the second electrode unit comprises a plurality of sensing electrodes, and the plurality of sensing electrodes are spaced apart from each other at a periphery of the body. A position information correction method for a touch device includes a plurality of first direction electrodes and a plurality of second direction electrodes, the method comprising the following steps: (a) performing a first stylus scanning program detection a stylus and obtaining first position information corresponding to one of the stylus; (b) performing a second stylus scanning process to obtain a second position information near the first position information; and (c) Calculating according to the first and second position information, obtaining position information after the stylus is corrected. The position information correction method of claim 6, wherein the stylus corrected position information includes at least a nib coordinate of the stylus. The position information correction method according to claim 6 or 7, wherein the stylus corrected position information includes an inclination direction of the stylus. The position information correction method according to claim 6, wherein the touch device alternately executes the first and second stylus scanning programs in a period of time. The position information correction method of claim 6, wherein the first stylus scanning program comprises an inductive signal for receiving the plurality of first direction and second direction electrodes. The position information correction method of claim 6, wherein the second stylus scanning program comprises sequentially outputting a driving signal to the first direction and the second direction electrode, and is driven after outputting the driving signal. The first direction or second direction electrode receives its own self-capacitance inductance. The position information correction method of claim 6, wherein the second stylus scanning program comprises sequentially outputting a driving signal to the first direction electrodes, and after outputting the driving signals for each time, from the second The directional electrode receives its mutual capacitance inductance. The position information correction method of claim 6, wherein the second stylus scanning program comprises sequentially outputting a driving signal to the second direction electrodes, and after outputting the driving signals for each time, from the first The directional electrode receives its mutual capacitance inductance. The method for correcting position information according to 11, 12 or 13, further comprising, after step (a), selecting a plurality of the first direction electrodes and a plurality of the plurality of first direction electrodes adjacent to the first position information according to the first position information. The second direction electrode performs step (b).