WO2021184215A1

WO2021184215A1 - Active stylus

Info

Publication number: WO2021184215A1
Application number: PCT/CN2020/079775
Authority: WO
Inventors: 王朋; 戴石礼; 罗忠波
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2021-09-23
Also published as: CN111837095A

Abstract

The present application provides an active stylus, capable of improving the accuracy of nib coordinate measurement of the active stylus when the stylus body is tilted. The active stylus comprises: a stylus body housing; and a first drive electrode comprising a connection rod provided in the middle of the stylus body housing and a head portion provided at the end of the connection rod at the nib, a first structural member being provided between the stylus body housing and the connection rod, wherein the head portion of the first drive electrode is hemispherical and has a radius greater than or equal to a first threshold, the diameter of the connection rod is less than or equal to a second threshold, and the second threshold is less than or equal to the first threshold.

Description

Active pen

Technical field

The embodiments of the present application relate to the field of touch technology, and more specifically, to an active pen.

Background technique

At present, the active pen, as the main peripheral input accessory of electronic equipment, has gradually attracted the attention of the market. The tip electrode of the active pen will output a drive signal, and a certain number of horizontal and vertical detection electrodes are distributed on the touch screen. Therefore, the drive signal output by the pen tip can be detected by the detection electrode, and the tip position can be calculated based on the detection signal. The two-dimensional position coordinates on the touch screen. However, when the active pen is writing, the tilt of the pen body will affect the accuracy of the pen tip coordinates.

Summary of the invention

The embodiment of the present application provides an active pen, which can improve the accuracy of the pen tip coordinate detection of the active pen when the pen body is tilted.

In the first aspect, an active pen is provided, including:

Pen body shell; and,

The first driving electrode includes a connecting rod arranged in the middle of the pen body shell, and a head arranged at one end of the nib of the connecting rod, and a first structure is arranged between the pen body shell and the connecting rod Wherein the head of the first driving electrode is hemispherical and has a radius greater than or equal to a first threshold, the diameter of one end of the pen tip of the connecting rod is less than or equal to a second threshold, and the second threshold is less than or equal to Mentioned first threshold.

In a possible implementation manner, the first threshold is greater than or equal to 0.3 mm.

In a possible implementation manner, the radius of the head of the first driving electrode is also smaller than or equal to the fifth threshold.

In a possible implementation manner, the fifth threshold is less than or equal to 0.8 mm.

In a possible implementation manner, the second threshold is less than or equal to 3 millimeters, for example, the second threshold is equal to 0.3 millimeters.

In a possible implementation manner, the connecting rod extends out of the pen body shell, so that the head of the first driving electrode is exposed.

In a possible implementation manner, the active pen further includes a pen tip housing, wherein the connecting rod extends to the pen tip housing, so that the head of the first driving electrode is contained in the pen tip housing.

In a possible implementation manner, the thickness of the pen tip housing at the head of the first driving electrode is less than or equal to a third threshold.

In a possible implementation manner, the third threshold is less than or equal to 3 millimeters, for example, the third threshold is equal to 0.3 millimeters.

In a possible implementation manner, the first structural member extends into the pen tip housing.

In a possible implementation manner, a second structural member is provided between the pen body shell and the first structural member, and a part of the first structural member close to the pen tip is not connected to the second structural member. overlapping.

In a possible implementation manner, the active pen further includes:

The isolation electrode is arranged on the part of the first structural member close to the pen tip; and,

The second driving electrode is arranged on the second structural member.

In a possible implementation manner, the active pen further includes:

The isolation electrode is arranged on the part of the first structural member close to the tip of the pen.

In a possible implementation manner, the distance between the isolation electrode and the head of the first driving electrode is less than or equal to a fourth threshold.

In a possible implementation manner, the active pen further includes:

The isolation electrode is arranged on the second structural member; and,

The second driving electrode is arranged on the part of the first structural member close to the pen tip.

In a possible implementation manner, the active pen further includes:

In a possible implementation manner, the distance between the second driving electrode and the head of the first driving electrode is less than or equal to a fourth threshold.

In a possible implementation manner, the fourth threshold is less than or equal to 10 millimeters, for example, the fourth threshold is equal to 2 millimeters.

In a possible implementation manner, the first driving electrode is used to output a first driving signal to the touch screen, and the first driving signal is used to calculate the position coordinates of the pen tip on the touch screen.

In a possible implementation manner, the second driving electrode is used to output a second driving signal to the touch screen, and the second driving signal is used to determine the tilt angle of the active pen relative to the touch screen.

In a possible implementation manner, the isolation electrode is used to isolate the interference signal of the first driving electrode.

Based on the above technical solution, the head of the first driving electrode is set to a hemispherical shape to reduce the geometric center of the head of the first driving electrode, so that the head of the first driving electrode is as close to the touch screen as possible; and the first driving is set The head radius of the electrode is greater than or equal to the first threshold to ensure the strength of the drive signal of the pen tip; and the diameter of the pen tip end of the link of the first drive electrode is less than or equal to the second threshold to reduce the drive signal of the metal link. Impact. In this way, when the active pen obliquely writes on the touch screen, it can effectively reduce and avoid the influence of the pen body tilt on the pen tip coordinate detection.

Description of the drawings

Figure 1 is a schematic diagram of the coordinate position detection of the active pen.

FIG. 2 is a schematic diagram of the tip structure of the active pen 100.

FIG. 3 is a schematic diagram of the detection result when the pen body of the active pen 100 is perpendicular to the touch screen.

4 is a schematic diagram of the detection result when the pen body of the active pen 100 is tilted relative to the touch screen.

FIG. 5 is a schematic diagram of the corresponding coupling capacitance changes of the active pen 100 under different tilt angles.

FIG. 6 is a schematic diagram of the nib structure of the active pen 600 according to an embodiment of the present application.

FIG. 7 is a schematic diagram of the corresponding coupling capacitance changes of the active pen 600 under different tilt angles.

FIG. 8 is a schematic diagram of a pen tip structure of an active pen 600 according to another embodiment of the present application.

FIG. 9 is a schematic diagram of a pen tip structure of an active pen 600 according to another embodiment of the present application.

FIG. 10 is a schematic diagram of a pen tip structure of an active pen 600 according to another embodiment of the present application.

FIG. 11 is a schematic diagram of a pen tip structure of an active pen 600 according to another embodiment of the present application.

Detailed ways

The technical solution in this application will be described below in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of the coordinate position detection of the active pen 100. The detection system of the capacitive active pen mainly includes the active pen 100 and the touch screen 200. The active pen 100 has a pen tip driving electrode. The electrode can emit a drive signal, and can also be called an excitation signal or a coding signal. The touch screen 200 is provided with row electrodes and column electrodes. A plurality of row electrodes and a plurality of column electrodes constitute electrode arrays in the Y direction and the X direction, respectively. When the tip driving electrode of the active pen 100 emits a driving signal, the coupling capacitance formed between the electrode and the row electrode of the touch screen and the coupling capacitance formed between the electrode and the column electrode of the touch screen will change, and the coupling capacitance is detected. , You can determine the coordinates of the active pen in the X direction and the Y direction, so as to finally determine the position of the active pen tip on the touch screen.

FIG. 2 is a schematic diagram of the tip structure of the active pen 100. As shown in FIG. 2, the active pen 100 includes a driving electrode 110, an isolation electrode 120, a structural member 130, a driving electrode 140, a structural member 150, a pen tip housing 160 and a pen body housing 170. Wherein, the head of the driving electrode 110 is tapered. The head of the driving electrode 110 is wrapped by a pen tip housing 160, which is made of an insulating material, such as silica gel or plastic. The isolation electrode 120 is disposed on the structural member 130, and the structural member 130 is made of an insulating material, such as plastic. The isolation electrode 120 is generally connected to the circuit reference ground of the active pen, and its function is to isolate the driving electrode 110 and the driving electrode 140. The driving electrode 140 is disposed on the structural member 150, and the structural member 150 is made of an insulating material, such as plastic. The driving electrode 110, the isolation electrode 120 and the driving electrode 140 are wrapped by the pen tip housing 160 and the pen body housing 170. The driving electrode 110 and the driving electrode 140 are combined together to detect the posture of the active pen. Wherein, the driving electrode 110 may emit a driving signal to the outside, so as to calculate the position coordinates of the pen tip of the active pen based on the principle shown in FIG. 1. The driving electrode 140 may also emit a driving signal to the outside. When the pen body of the active pen 100 is tilted, the driving signal emitted by the driving electrode 140 is used to calculate the tilt angle of the active pen 100. The touch screen 200 can present a handwriting shape matching the degree of inclination to the user according to the inclination angle, thereby enhancing the user experience.

However, when the active pen 100 is tilted, the calculation of the coordinates of the pen tip position of the active pen 100 may be affected. The description will be given below in conjunction with FIG. 3 and FIG. 4. Among them, Fig. 3 and Fig. 4 both show three adjacent receiving channels, hereinafter referred to as channels. The channel S1, the channel S3, and the channel S2 may be three adjacent row electrodes or three adjacent column electrodes on the touch screen in FIG. 1, for example. As shown in FIG. 3, when the pen body of the active pen 100 is perpendicular to the surface of the cover plate 210 of the touch screen 200, since the contact point of the pen tip and the cover plate 210 is located directly above the channel S2, at this time, the driving electrode 110 and the channel S1 The coupling capacitance C1 therebetween is equal to the coupling capacitance C3 between the driving electrode 110 and the channel S3. The coupling capacitance C2 between the driving electrode 110 and the channel S2 is larger than the coupling capacitance C1 and the coupling capacitance C3. At this time, the pen tip coordinates obtained by the touch screen 200 are located directly above the channel S2, which is consistent with the actual pen tip position.

However, when the pen body of the active pen 100 is tilted, as shown in FIG. 4, the driving electrode 110 is more biased toward the side of the channel S3. Therefore, the coupling capacitance C1' between the driving electrode 110 and the channel S1 will be smaller than the corresponding coupling capacitance C1 when the pen body is vertical as shown in FIG. 3, and the coupling capacitance C3' between the driving electrode 110 and the channel S3, It is larger than the corresponding coupling capacitor C3 when the pen body is vertical as shown in FIG. 3. At this time, the pen tip coordinate position calculated according to the coupling capacitor will be shifted to the right, that is, to one side of channel S3, and the actual pen tip position is directly above channel S2, which results in the tip calculated when the active pen 100 is tilted The coordinates do not match the actual pen tip position, which affects the user experience.

For Fig. 4, the coupling capacitance detected when the pen body is tilted is simulated, and the variation of the coupling capacitance shown in Fig. 5 is obtained. 5 shows the variation of the coupling capacitance between the driving electrode 110 and the channel S1, the channel S2, and the channel S3 when the active pen 100 and the cover 210 are at different angles. It can be seen that when the tilt angle of the active pen 100 is 90°, that is, when the active pen 100 is perpendicular to the cover 210, the coupling capacitance C1 of the channel S1 and the coupling capacitance C3 of the channel S3 are equal, and when the tilt angle of the active pen 100 At 60°, 45°, and 30°, the coupling capacitance C1 between the driving electrode 110 and the channel S1 gradually decreases, and the coupling capacitance C3 between the driving electrode 110 and the channel S3 increases rapidly. It can be seen that the more the pen body is tilted, the greater the difference between the calculated pen tip coordinate position and the actual pen tip position.

For this reason, the embodiment of the present application improves and optimizes the structure of the pen tip, and improves the accuracy of the pen tip coordinate detection when the pen body is tilted.

FIG. 6 is a schematic structural diagram of an active pen 600 according to an embodiment of the present application. As shown in Fig. 6, the active pen 600 includes:

Pen body shell 670; and,

The first driving electrode 610 includes a connecting rod arranged in the middle of the pen body housing 670 and a head arranged at one end of the nib of the connecting rod. A first structural member 630 is arranged between the pen body housing 670 and the connecting rod. Wherein, the head of the first driving electrode 610 has a hemispherical shape.

In this embodiment, the radius A of the head of the first driving electrode 610 is greater than or equal to the first threshold, the diameter D of the tip end of the connecting rod of the first driving electrode 610 is less than or equal to the second threshold, and the second threshold is less than or Equal to the first threshold.

Since the head of the first driving electrode 610 is changed from a cone to a hemispherical shape, the geometric center of the head of the first driving electrode 610 is greatly reduced, and the head of the first driving electrode 610 is as close to the touch screen as possible. When the pen body is tilted, the geometric center position of the head of the first driving electrode 610 does not move significantly, thereby reducing the offset of the pen tip coordinate position when the pen body is tilted.

The radius A of the head of the first driving electrode 610 may be set to be greater than or equal to the first threshold to ensure that the driving signal emitted by the first driving electrode 610 has sufficient strength. For example, the first threshold is greater than or equal to 0.3 mm.

The head of the first driving electrode 610 is located at the end of the connecting rod close to the tip of the pen, and the diameter D of the end of the tip of the connecting rod is less than or equal to the second threshold, so as to reduce the impact of the signal radiated on the metal connecting rod on the head of the first driving electrode 610. The driving signal emitted by the part causes the influence. The second threshold is, for example, less than or equal to 3 millimeters, and preferably, the second threshold is equal to 0.3 millimeters. In this way, by enhancing the intensity of the driving signal emitted by the head of the first driving electrode 610 and reducing the intensity of the interference signal introduced by the connecting rod, the accuracy of pen tip coordinate detection is further improved.

Further, the radius A of the head of the first driving electrode 610 can also be set to be less than or equal to a fifth threshold, and the fifth threshold can be less than or equal to 0.8 mm, for example. Preferably, the radius A of the head of the first driving electrode 610 satisfies: 0.3 mm≦A≦0.8 mm.

In this way, by setting the shape of the head of the first driving electrode 610 of the active pen to a hemispherical shape, and setting the radius of the head and the diameter of the connecting rod within a reasonable range, the pen body can be effectively reduced and prevented from tilting. The impact on the pen tip coordinate detection.

It should be understood that the above-mentioned hemispherical shape may refer to a half of a spherical shape, or more than half of a spherical shape, or a less than half of a spherical shape, as long as the head of the first driving electrode 610 includes at least a part of a spherical shape.

For FIG. 4, when the pen body is tilted, the coupling capacitance between the first driving electrode 610 and the receiving channel of the touch screen 200 is simulated, and the variation of the coupling capacitance shown in FIG. 7 is obtained. FIG. 7 shows the variation of the coupling capacitance between the first driving electrode 610 and the channel S1, the channel S2, and the channel S3 when the active pen 600 and the cover 210 are at different angles. It can be seen that when the tilt angle of the active pen 600 is 90°, that is, when the active pen 600 is perpendicular to the cover 210, the coupling capacitance C1 of the channel S1 and the coupling capacitance C3 of the channel S3 are equal, and when the tilt angle of the active pen 600 At 60°, 45° and 30°, the coupling capacitance C1 between the first driving electrode 610 and the channel S1 gradually decreases, and the coupling capacitance C3 between the first driving electrode 610 and the channel S3 gradually increases. However, comparing the detection structure of the active pen 600 shown in FIG. 7 with the detection structure of the active pen 100 shown in FIG. Impact on coupling capacitor C1 and coupling capacitor C3. The improved first driving electrode 610 makes the variation range of the coupling capacitance between it and channel S1, channel S2, and channel S3 significantly reduced, that is to say, when the pen body is tilted, the pen tip coordinates will not change significantly. Offset.

In the embodiment of the present application, the active pen 600 may further include a pen tip housing 660. Wherein, the connecting rod of the first driving electrode 610 can be extended to the pen tip housing 660, so that the head of the first driving electrode 610 is contained in the pen tip housing 660; The connecting rod extends out of the pen body shell 670 so that the head of the first driving electrode 610 is exposed.

The active pen 600 shown in FIG. 6 includes a pen tip housing 660. The nib shell 660 can be integrally formed with the pen body shell 670; or as shown in FIG. 6, the nib shell 660 and the pen body shell 670 can be used as two separate parts, wherein the nib shell 660 can be mounted on the pen body shell. 670, and can be flexibly removed from the pen body shell 670, which facilitates the maintenance and replacement of the first driving electrode 610.

When the pen tip housing 660 is provided in the active pen 600, the thickness B of the pen tip housing 660 at the head of the first driving electrode 610 is less than or equal to the third threshold. The third threshold is, for example, less than or equal to 3 millimeters, and preferably, the third threshold is 0.3 millimeters. The pen tip housing 660 may block the driving signal emitted by the first driving electrode 610. Therefore, limiting the thickness of the pen tip housing 660 can reduce the blocking of the driving signal emitted by the first driving electrode 610, and improve the detection efficiency of the touch screen 200. The strength of the signal improves the accuracy of pen tip position detection.

The first structural member 630 plays a supporting and fixing role. Optionally, the first structural member 630 may extend into the pen tip housing 660, for example, as shown in FIG. 6. However, the embodiment of the present application does not limit this, and the first structural member 630 may be only wrapped in the pen body shell 670.

Optionally, as shown in FIG. 6, a second structural member 650 may also be provided between the pen body housing 670 and the first structural member 630. The second structural member 650 plays a supporting and fixing role. Wherein, the part of the first structural member 630 close to the pen tip does not overlap with the second structural member 650. In other words, the first structural member 630 protrudes from the second structural member 650 at an end close to the pen tip, so as not to be covered by the second structural member 650. The portion of the first structural member 630 close to the pen tip can be used to provide driving electrodes or isolation electrodes.

Optionally, as shown in FIG. 6, the active pen 600 further includes a second driving electrode 640 and an isolation electrode 620. The driving signal output by the first driving electrode 610 to the touch screen is used to calculate the position coordinates of the pen tip on the touch screen 200. The driving signal output by the second driving electrode to the touch screen is used to calculate the tilt angle of the active pen 600 relative to the touch screen. The isolation electrode 620 may be used to isolate signal interference between the first driving electrode 610 and the second driving electrode 640. In addition, the isolation electrode 620 in the embodiment of the present application can also isolate a part of the signal radiated from the connecting rod of the first driving electrode 610.

The second driving electrode 640 may be disposed on the second structure 650. The isolation electrode 620 may be disposed on the part of the first structural member 630 close to the tip of the pen. Wherein, the distance C between the isolation electrode 620 and the head of the first driving electrode 610 is less than or equal to the fourth threshold. By reducing the distance C between the isolation electrode 620 and the head of the first driving electrode 610, the interference signal isolation effect is enhanced, and the driving of other electrodes or lines to the head of the first driving electrode 610 is reduced as much as possible. The influence caused by the signal. The fourth threshold is, for example, less than or equal to 10 millimeters, and preferably, the fourth threshold is equal to 2 millimeters.

The active pen 600 shown in FIG. 6 is only an example, and the active pen 600 in the embodiment of the present application may also have other structures after deformation.

For example, as shown in FIG. 8, the active pen 600 may not be provided with a pen tip housing 660 to prevent the pen tip housing 660 from blocking the driving signal emitted by the head of the first driving electrode 610. At this time, compared to FIG. 6, the aforementioned components 620 to 650 are all contained in the pen body housing 670, and only the head of the first driving electrode 610 and part of the connecting rod are exposed in the air.

In the embodiment of the present application, the second driving electrode 640 and the isolation electrode 620 may also be arranged in other positions, and the active pen may not include the second driving electrode 640 or the isolation electrode 620.

For example, as shown in FIG. 9, the active pen 600 includes the second driving electrode 640 and the isolation electrode 620, but the positions of the second driving electrode 640 and the isolation electrode 620 shown in FIG. The location of the isolation electrode 620 is different. In FIG. 9, the isolation electrode 620 is disposed on the second structure 650, and the second driving electrode 640 is disposed on the first structure 630 near the tip of the pen. At this time, the isolation electrode 620 can be used to isolate the signal interference caused by the circuit board in the active pen to the first driving electrode 610 and the second driving electrode 640. The distance between the second driving electrode 640 and the head of the first driving electrode 610 is less than the fourth threshold, so that when the active pen is tilted, the second driving electrode 640 will not be too far away from the touch screen, so as to ensure that the touch screen detects the second The strength of the effective signal of the driving electrode 640.

For another example, the isolation electrode 620 shown in FIG. 9 can be removed to form the active pen 600 shown in FIG. 10. Wherein, the active pen 600 in FIG. 10 does not include the isolation electrode 620. The second driving electrode 640 is disposed on the part of the first structure 630 close to the pen tip. Since the isolation electrode 620 is not provided, the cost of the active pen 600 can be reduced if the detection accuracy is satisfied.

In another example, the second driving electrode 640 shown in FIG. 9 can be replaced with an isolation electrode 620 to form the active pen 600 shown in FIG. 11. Among them, the active pen 600 does not include the second driving electrode 640. The isolation electrode 620 is disposed on the part of the first structural member 630 close to the tip of the pen. At this time, the active pen 600 does not have functions such as adjusting the shape of the handwriting according to the tilt angle, but the cost of the active pen 600 is further reduced. In addition, the isolation electrode 620 can be used to isolate the signal interference caused by the circuit board in the active pen 600 to the first driving electrode 610, thereby improving the accuracy of the pen tip position detection.

It should be understood that the specific details of the other components of the active pen 600 in FIG. 8 to FIG. 11, such as the size, etc., can be referred to the foregoing description with respect to FIG.

It should be noted that, under the premise of no conflict, the various embodiments described in this application and/or the technical features in each embodiment can be combined with each other arbitrarily, and the technical solutions obtained after the combination should also fall within the protection scope of this application. .

It should be understood that the specific examples in the embodiments of the present application are only to help those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application. Various improvements and modifications have been made, and these improvements or modifications fall within the scope of protection of the present application.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

An active pen, characterized in that it comprises:

Pen body shell; and,

The first driving electrode includes a connecting rod arranged in the middle of the pen body shell, and a head arranged at one end of the nib of the connecting rod, and a first structure is arranged between the pen body shell and the connecting rod Wherein the head of the first driving electrode is hemispherical and has a radius greater than or equal to a first threshold, the diameter of one end of the pen tip of the connecting rod is less than or equal to a second threshold, and the second threshold is less than or equal to Mentioned first threshold.
The active pen according to claim 1, wherein the first threshold is greater than or equal to 0.3 mm.
The active pen according to claim 1 or 2, wherein the radius of the head of the first driving electrode is also smaller than or equal to a fifth threshold.
The active pen according to claim 3, wherein the fifth threshold is less than or equal to 0.8 mm.
The active pen according to any one of claims 1 to 4, wherein the second threshold value is less than or equal to 3 millimeters.
The active pen according to claim 5, wherein the second threshold is equal to 0.3 mm.
The active pen according to any one of claims 1 to 6, wherein the connecting rod extends out of the pen body shell, so that the head of the first driving electrode is exposed.
The active pen according to any one of claims 1 to 6, further comprising a pen tip housing, wherein the connecting rod extends to the pen tip housing so that the head of the first driving electrode is accommodated in Inside the pen tip housing.
8. The active pen according to claim 8, wherein the thickness of the pen tip shell at the head of the first driving electrode is less than or equal to a third threshold.
The active pen according to claim 9, wherein the third threshold is less than or equal to 3 millimeters.
The active pen according to claim 10, wherein the third threshold is equal to 0.3 millimeters.
The active pen according to any one of claims 8 to 11, wherein the first structural member extends into the pen tip housing.
The active pen according to any one of claims 1 to 12, wherein a second structural member is provided between the pen body shell and the first structural member, and the first structural member is close to The part of the pen tip does not overlap with the second structural member.
The active pen according to claim 13, further comprising:

The isolation electrode is arranged on the part of the first structural member close to the pen tip; and,

The second driving electrode is arranged on the second structural member.
The active pen according to claim 13, further comprising:

The isolation electrode is arranged on the part of the first structural member close to the tip of the pen.
The active pen according to claim 14 or 15, wherein the distance between the isolation electrode and the head of the first driving electrode is less than or equal to a fourth threshold.
The active pen according to claim 13, further comprising:

The isolation electrode is arranged on the second structural member; and,

The second driving electrode is arranged on the part of the first structural member close to the pen tip.
The active pen according to claim 13, further comprising:

The second driving electrode is arranged on the part of the first structural member close to the pen tip.
The active pen according to claim 17 or 18, wherein the distance between the second driving electrode and the head of the first driving electrode is less than or equal to a fourth threshold.
The active pen according to claim 16 or 19, wherein the fourth threshold is less than or equal to 10 millimeters.
The active pen according to claim 20, wherein the fourth threshold is equal to 2 millimeters.
The active pen according to any one of claims 1 to 21, wherein the first drive electrode is used to output a first drive signal to the touch screen, and the first drive signal is used to calculate the tip of the pen on the touch screen. The position coordinates on the.
The active pen according to any one of claims 14, 17 to 19, wherein the second driving electrode is used to output a second driving signal to the touch screen, and the second driving signal is used to determine the active The tilt angle of the pen relative to the touch screen.
The active pen according to any one of claims 14 to 17, wherein the isolation electrode is used to isolate an interference signal of the first driving electrode.