CN112947837A

CN112947837A - Electronic system and method for wipe zone setting

Info

Publication number: CN112947837A
Application number: CN202011458848.0A
Authority: CN
Inventors: 叶尚泰
Original assignee: Egalax Empia Technology Inc
Current assignee: Egalax Empia Technology Inc
Priority date: 2019-12-11
Filing date: 2020-12-11
Publication date: 2021-06-11
Also published as: TWI727545B; TW202122985A

Abstract

The invention provides an electronic system and a method for setting a wiping area. The wiping area setting method includes: receiving the posture and the contact pressure of the electronic blackboard eraser corresponding to the touch screen; judging whether at least one corner of the electronic blackboard eraser contacts the touch screen; and when at least one corner of the wiping surface of the electronic board wiper contacts the touch screen, determining the attribute of the wiping area according to any combination of the gesture and the contact pressure.

Description

Electronic system and method for wipe zone setting

Technical Field

The present invention relates to an electronic eraser, and more particularly, to an electronic eraser and system having similar experience to conventional erasers.

Background

The blackboard or whiteboard is a common tool for traditional teaching. The user can write on the whiteboard with the marker and erase the writing of the marker with the eraser. Some manufacturers have manufactured electronic whiteboards, which allow users to move on the electronic whiteboards by using touch pens. The electronic whiteboard can sense the position of a pen point of the touch pen, and handwriting is displayed on the electronic whiteboard so as to simulate the scene of writing on the whiteboard by the marker pen. When a user wants to erase a portion of the area on the electronic whiteboard, the setting of the stylus needs to be changed to change the marker mode to the eraser mode. However, the stylus has a small tip area and cannot wipe a large area of traces, as compared to conventional eraser pads. Causing considerable difficulties for the user when using the electronic whiteboard. Accordingly, there is a need for a device that can be simulated as a conventional eraser, allowing a user to easily wipe a large area of an electronic whiteboard.

When a user uses a conventional eraser to erase a blackboard, the user usually uses one side or one corner of the eraser to erase a small area, so as to correct or modify the contents in the small area without affecting the peripheral area. The same experience of use also needs to be retained when using an electronic board eraser capable of wiping a large area. Besides wiping a large area in a full-face fit manner, the user can also wipe one side or one corner of the electronic blackboard eraser. When one side or one corner is used, the wiping effect can be changed along with the lightness and the heaviness according to the pressure applied by the electronic blackboard eraser.

Disclosure of Invention

The method and the electronic system provided by the invention can be used for setting the wiping area. The user can wipe one side or one corner of the electronic blackboard eraser by using the method of full-face fitting to wipe a large area. When one side or one corner is used, the wiping effect can be changed along with the lightness and the heaviness according to the pressure applied by the electronic board wiper.

According to an embodiment of the present invention, a method for setting a wiping area is provided, including: receiving the posture and the contact pressure of the electronic blackboard eraser corresponding to the touch screen; judging whether the electronic board eraser is at least contacted with the touch screen; and when at least one corner of the wiping surface of the electronic board wiper contacts the touch screen, determining the attribute of the wiping area according to any combination of the gesture and the contact pressure.

In one embodiment, in order to receive the gesture and the contact pressure more quickly or have a higher update rate of the gesture of the electronic eraser, wherein the gesture and the contact pressure are received from a touch processing device connected to the touch screen, the touch processing device receives electrical signals sent by a plurality of eraser electrodes of the electronic eraser through touch electrodes included in the touch screen, so as to calculate the gesture and the contact pressure according to a relative position between the electrical signal and the eraser electrodes.

In one embodiment, to support an electronic blackboard eraser capable of transmitting information from a non-touch screen, the method for setting a wiping area further comprises: receiving the contact pressure from the electronic blackboard eraser; receiving a plurality of proximity events of a plurality of eraser electrodes of the electronic eraser corresponding to the touch screen from the touch processing device; and solving the posture and the contact pressure according to the plurality of proximity events, the contact pressure and the relative positions between the plurality of eraser electrodes.

In one embodiment, the directionality of the wiping area may be controlled for the user to experience the gesture of the electronic blackboard eraser, wherein the step of determining the attributes of the wiping area further comprises: when only one corner of the wiping surface is in contact with the touch screen, the shape of the wiping area is a directional shape, and the directional shape and the direction of the shape correspond to the gesture.

In an embodiment, the directivity of the wiping area may be controlled for the user to experience the gesture of the electronic board wiper, wherein the shape of the wiping area includes a pointing angle, the pointing angle corresponds to an included angle between the wiping surface and the touch screen, and the pointing angle is smaller when the included angle between the wiping surface and the touch screen is larger.

In one embodiment, the wiping area may be controlled in order to allow the user to experience the gesture of the electronic blackboard eraser, wherein the size of the wiping area corresponds to one of the following parameters or any combination thereof: an included angle between the wiping surface and the touch screen; the contact pressure of the corner; and the average contact pressure of the wiping surface and the side of the touch screen.

In one embodiment, to allow a user to control the wipe rate of change with contact pressure, wherein the wipe rate of change within the wiping area is uniform, the wipe rate of change corresponds to the angular contact pressure. The average contact pressure may be an average of the contact pressures at the two corners that determine the edge.

In one embodiment, to simulate the wiping scenario of a conventional eraser, wherein the rate of change of wiping within the wiping zone is non-uniform, the change in the rate of change of wiping corresponds to the orientation of the shape of the directivity.

In an embodiment, in order to reflect that the shape of the electronic eraser is asymmetric corresponding to the contact angle, wherein the shape of the directivity is asymmetric, the shape of the directivity corresponds to two angles between two adjacent sides of the angle and the touch screen.

In one embodiment, the control of the electronic board eraser is applied to a curved touchscreen, wherein when the touchscreen is curved, the gesture is a local plane relative to the position of the corner contacting the touchscreen.

According to an embodiment of the present invention, there is provided an electronic system for setting a wiping area, including: a touch processing device connected to the touch screen; and a host connected to the touch processing device for executing the program stored in the non-volatile memory to implement the following steps: receiving the posture and the contact pressure of the electronic board eraser corresponding to the touch screen; judging whether at least one corner of the electronic blackboard eraser contacts the touch screen; and when at least one corner of the wiping surface of the electronic board wiper contacts the touch screen, determining the attribute of the wiping area according to any combination of the gesture and the contact pressure.

In one embodiment, in order to receive the gesture and the contact pressure more quickly or have a higher update rate of the gesture of the electronic board eraser, the gesture and the contact pressure are received from the touch processing device, the touch processing device receives the electrical signals sent by the plurality of board eraser electrodes of the electronic board eraser through the touch electrodes included in the touch screen, so as to calculate the gesture and the contact pressure according to the relative positions between the electrical signals and the plurality of board eraser electrodes.

In one embodiment, to support an electronic eraser capable of transmitting information from a non-touch screen, the electronic system further comprises: a signal receiver connected to the electronic eraser for receiving the contact pressure from the signal transmitter of the electronic eraser, wherein the host is connected to the signal receiver and further for executing a program stored in the non-volatile memory to perform the following steps: receiving a plurality of proximity events of a plurality of eraser electrodes of the electronic eraser corresponding to the touch screen from the touch processing device; and solving the posture and the contact pressure according to the proximity events, the contact pressure and the relative positions of the plurality of eraser electrodes.

In one embodiment, the wiping area may be controlled in order to allow the user to experience the gesture of the electronic blackboard eraser, wherein the size of the wiping area corresponds to one of the following parameters or any combination thereof: an included angle between the wiping surface and the touch screen; the contact pressure of the corner; and the average contact pressure of the wiping surface and the side of the touch screen. The average contact pressure may be an average of the contact pressures at the two corners that determine the edge.

In one embodiment, to allow a user to control the wipe rate of change with contact pressure, wherein the wipe rate of change within the wiping area is uniform, the wipe rate of change corresponds to the angular contact pressure.

According to an embodiment of the present invention, the electronic device further includes the touch screen and the electronic board eraser.

Drawings

FIG. 1 is a diagram of an electronic system 100 according to an embodiment of the invention.

Fig. 2 is a block diagram of a touch processing device 130 according to an embodiment of the invention.

FIG. 3A is a top view of the electronic board eraser 115 according to an embodiment of the invention.

FIG. 3B is a side view of the electronic board eraser 115 according to an embodiment of the invention.

FIG. 3C is a top view of the electronic board eraser 115 according to an embodiment of the invention.

FIG. 3D is a top view of the electronic board eraser 115 according to an embodiment of the invention.

FIG. 3E is a top view of the electronic board eraser 115 according to an embodiment of the invention.

FIG. 3F is a top view of the electronic board eraser 115 according to an embodiment of the invention.

FIG. 4 is a block diagram of an electronic blackboard eraser according to an embodiment of the invention.

FIG. 5A is a timing diagram illustrating the operation of the electronic system 100 according to an embodiment of the invention.

FIG. 5B is a variation of the embodiment of FIG. 5A.

FIG. 5C is a variation of the embodiment of FIGS. 5A and 5B.

Fig. 6A to 6G are timing diagrams illustrating the operation of the stylus and board erase detection period 520 according to the embodiment of the invention.

FIG. 7 is a flowchart illustrating an eraser detection method according to an embodiment of the invention.

FIG. 8 is a block diagram of a method for controlling an electronic eraser according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of two projection areas of the electronic board eraser on the touch screen 120 according to an embodiment of the invention.

FIG. 10 is a schematic view of an attitude axis of the electronic blackboard eraser according to an embodiment of the invention.

FIGS. 11A-11C are schematic diagrams of an attitude side view and a wiping area according to three embodiments of the present invention.

FIG. 12 is a schematic illustration of a wiping zone shape according to various embodiments of the invention.

FIG. 13 is a schematic illustration of symmetric and asymmetric wiping zone shapes for various embodiments of the present invention.

FIGS. 14A-14C are schematic diagrams of wipe rate of change within a wipe zone according to various embodiments of the present invention.

Fig. 15 is a flowchart of a wiping area setting method according to an embodiment of the present invention.

[ description of main element symbols ]

100:

electronic systems

110A, 110B: touch control pen

112:

hands

115, 115A, 115B: electronic blackboard eraser

120: the touch panel 121: a first electrode

122: second electrode 130: touch control processing device

140: the host 150: display processing device

160: the display 210: connecting network

220: the driving circuit 230: sensing circuit

240: the embedded processor 250: host interface

310: the housing 320: input device

320A: first button 320B: second push button

330: wiping surface 341: first eraser electrode

342: first eraser electrode 343: third plate wiping electrode

344: fourth eraser electrode 350: sensing electrode

410: the driving circuit 420: sensing circuit

440: the embedded processor 450: battery with a battery cell

460: the wireless charging module 510: a first period of time

520: second period 521: beacon signal transmission period

522: stylus detection period 523: time interval for detecting blackboard eraser

524: lighthouse signal transmission period 530: time period

540: period 611: information transmission time interval

641: first eraser electrode transmission period 642: second eraser electrode transmission period

643: third plate erasing electrode transmission period 644: fourth eraser electrode transmission period

710-765: step 810-820: step (ii) of

910: projection region 911: short side

912: long side 920: projection area

921: short side 922: long side

941. 942, 943, 944: position 1000: three-dimensional reference coordinate system

1010: first virtual vector 1020: projection vector

1030: second virtual vector 1102: first included angle

1103: second included angle 1110: wiping area

1120: wiping area 1130: wiping area

1210: wiping area 1212: point of direction

1214: opening angle 1220: wiping area

1230: wiping area 1240: wiping area

1250: wiping area 1260: wiping area

1270: wiping area 1310: wiping area

1311: angle 1312: angle of rotation

1510 to 1540: step (ii) of

Detailed Description

Please refer to fig. 1, which is a diagram illustrating an electronic system 100 according to an embodiment of the invention. The electronic system 100 includes a host 140 that includes devices for controlling the overall operation of the electronic system 100, such as a central processing unit (cpu), a memory, and an interface for interfacing with peripheral input/output devices. The interface may include industry standard interfaces such as PCI, PCI-E, SATA, ATA, USB, UART, etc., or may include proprietary interfaces. The host 140 is connected to a display processing device 150 via the interface, which is used for connecting to a display 160 and processing the display content of the display 160. The host 140 is also connected to a touch processing device 130 through the interface, and is used for connecting to a transparent touch panel 120 formed by a plurality of touch electrodes, and detecting an external conductive object (such as a hand 112), touch pens 110A and 110B, an electronic board eraser 115A and an electronic board eraser 115B, etc. approaching or contacting (abbreviated as proximity) by using the touch panel 120. The transparent touch panel 120 includes a plurality of first electrodes 121 parallel to a first axis and a plurality of second electrodes 122 parallel to a second axis. The transparent touch panel 120 can be directly disposed on the display 160, or the touch panel 120 and the liquid crystal display 160 can be integrated together to form an in-cell touch panel. The invention is not limited to the combination of the transparent touch panel 120 and the display 160. In one embodiment, the touch screen 120 can be collectively referred to as a touch panel 120 and a display 160.

The central processing unit of the host 140 can execute instructions and data stored in the non-volatile memory for executing operating systems and applications. The host 140 and the display processing device 150 can control the display of the display 160 or the touch screen 120 individually or jointly according to the instructions of the operating system and the application program. In the present invention, the host 140 is generally used to control the display. When the host 140 executes some programs, the touch screen 120 displays a drawing area. When the

stylus

110A or 110B inputs in the drawing area, the drawing area displays the handwriting range of the

stylus

110A or 110B accordingly. The display content in the handwriting range changes in response to the input of the

stylus

110A or 110B. Similarly, when the

electronic eraser

115A or 115B is input in the drawing area, there is a wiping area corresponding to the

electronic eraser

115A or 115B in the drawing area. The display content in the wipe region may change in response to an input from the

electronic eraser

115A or 115B.

Fig. 2 is a block diagram of a touch processing device 130 according to an embodiment of the invention. The touch processing device 130 includes an embedded processor 240 for connecting and controlling the connection network 210, the driving circuit 220, the sensing circuit 230 and the host interface 250. The driving circuit 220 can be connected to each of the first electrodes 121 and each of the second electrodes 122 through the connection network 210, respectively, for emitting driving signals by using the electrodes. The sensing circuit 230 can be connected to each of the first electrodes 121 and each of the second electrodes 122 through the connection network 210, respectively, for sensing signals using the electrodes. The embedded processor 240 can communicate with the host 140 through the host interface 250. The embedded processor 240 may execute program modules stored in the non-volatile memory for detecting the proximity object and the proximity event.

Please refer to fig. 3A, which is a top view of the electronic board eraser 115 according to an embodiment of the invention. The electronic eraser 115 may be a cuboid comprising a housing 310 for holding by a user, containing a wired/wireless rechargeable or replaceable power module and circuitry. The housing 310 may include one or more input devices 320, such as a first button 320A and a second button 320B, on the top or side thereof. One of the buttons or switches may be used to turn on and off the electronic components inside the electronic eraser 115. In addition to conventional mechanical buttons, the input device 320 may be a scroll wheel, a multi-stage switch, a touch button, an accelerometer, a gyroscope, a motion sensor, or the like. The housing 310 may also contain output devices such as lights, vibrators and sound generators for indicating the amount of power or its status of use.

Please refer to fig. 3B, which is a side view of the electronic board eraser 115 according to an embodiment of the invention. An elastic wiping surface 330 is provided below the housing 310. In addition to being used to contact the transparent touch panel 120, the wiping surface 330 can be used to wipe the handwriting written by a marker on a conventional whiteboard. The housing 310, the input device 320 and the wiping surface 330 may be made of waterproof material, and the connection portion thereof may also be waterproof, so as to facilitate the user to clean the electronic blackboard eraser 115.

Please refer to fig. 3C, which is a top view of the electronic board eraser 115 according to an embodiment of the invention. In this embodiment, the wiping surface 330 includes a first erasing electrode 341, a second erasing electrode 342 and a third erasing electrode 343, which are respectively located at three corners of the wiping surface 330. The wiping surfaces at the three corners can be made of elastic conductive material to be used as the wiping electrodes.

Please refer to fig. 3D, which is a top view of the electronic board eraser 115 according to an embodiment of the invention. In this embodiment, the wiping surface 330 includes a first erasing electrode 341, a second erasing electrode 342, a third erasing electrode 343, and a fourth erasing electrode 344, which are respectively located at four corners of the wiping surface 330. The wiping surfaces at the four corners can be made of elastic conductive material to be used as the wiping electrodes.

In one embodiment, the eraser electrodes 341-344 may comprise or be part of a force sensor. These force sensors sense pressure with passive components such as force sensing resistors, force sensing capacitors, etc., or with active components.

For passive force sensors, reference may be made to the description of applicant's U.S. patent application Ser. No. US2015/0153845 and its priority documents. This application is exemplified by a stylus pen, but can be applied to the electronic blackboard eraser 115 of the present invention. For example, fig. 2-5 of the application use at least two signal sources with different frequencies to output a signal with a first frequency and a signal with a second frequency to a first element with a variable impedance value and a second element with a constant impedance value, respectively. The first element changes its impedance value when pressed by a stylus tip (e.g., the eraser electrodes 341-344 of the present application), and the tip or the eraser electrodes 341-344 send an electrical signal to the touch panel 120. A relationship between the amplitude of the first frequency signal and the amplitude of the second frequency signal in the electrical signal may represent the pressure value applied to the pen tip or the eraser electrodes 341-344.

Fig. 7A to 7D of the present application use a single frequency signal source to output a signal with a first frequency and a signal with a second frequency to a first element with a variable impedance value and a second element with a constant impedance value, respectively. The first element changes its impedance value when subjected to pressure from a stylus tip (e.g., eraser electrodes 341-344). The electronic eraser 115 can calculate the current values output by the first and second elements, respectively, which represent the pressure values to which the pen tip or the eraser electrodes 341-344 are subjected.

For the active force sensor, refer to the example of the patent application publication 201339904 in taiwan, which is also exemplified by a touch pen, but can be applied to the electronic eraser 115 of the present invention. The stylus tip and the signal transmitter need only be replaced with the eraser electrodes 341-344.

The shape of the eraser electrode of figure 3D is not the same as compared to the shape of the eraser electrode of figure 3C. The shape of the eraser electrodes 341-344 is not limited in the present invention. In FIG. 3D, the electronic eraser 115 further comprises a sensing electrode 350. The sensing electrode 350 can be located on the surface of the wiping face 330. Although FIG. 3D illustrates the sensing electrode 350 as being positioned in the middle of the wiping surface 330, the present invention is not limited to the sensing electrode 350. The sensing electrode 350 can be used for receiving the beacon signal from the touch panel 120, and when the beacon signal is strong, the sensing electrode 350 can be disposed in the housing 310 without being located on the surface of the wiping surface 330, so as to sense the beacon signal.

Please refer to fig. 3E, which is a top view of the electronic board eraser 115 according to an embodiment of the invention. In this embodiment, the wiping surface 330 includes a first erase electrode 341, a second erase electrode 342, and a third erase electrode 343. The three wiper electrodes 341-343 are not at the corners of the wiping surface 330, but form a triangle on the wiping surface 330. In order to identify the direction of the electronic eraser 115, each side of the triangle formed by the three eraser electrodes 341-343 is not equal in length. Accordingly, the touch processing device 130 can calculate the projection of the wiping surface 330 of the electronic eraser 115 onto the surface of the touch panel 120 after detecting the positions of the eraser electrodes 341 to 343.

Please refer to fig. 3F, which is a top view of the electronic board eraser 115 according to an embodiment of the invention. In this embodiment, the wiping face 330 is an oval. In other words, the electronic eraser 115 may be an elliptical cube for the user to hold. The invention does not limit the shape of the electronic board eraser 115 and the erasing surface 330, so long as the use is convenient.

Please refer to fig. 4, which is a block diagram of an electronic board eraser according to an embodiment of the invention. The electronic eraser 115 may comprise a driving circuit 410, a sensing circuit 420, an embedded processor 440, a battery 450 and a wireless charging module 460 connected to the battery 450. The battery 450 is used to supply power to various electronic components inside the electronic blackboard 115. The driving circuit 410 is connected to the erasing electrodes 341 to 344, respectively, for sending an electrical signal to the touch panel 120. The sensing circuit 420 is connected to the sensing electrode 350 to detect a beacon signal. The embedded processor 440 is configured to be connected to the driving circuit 410, the sensing circuit 420, and the input devices and output devices, such as the first button 320A and the second button 320B. The embedded processor 440 can execute a program module stored in a non-volatile memory for enabling the touch processing device 130 to detect the motion of the electronic board eraser 115. The wireless charging module 460 can be used for receiving a wireless charging signal to charge the battery 450. The wireless charging signal may be from the touch panel 120 or a specific wireless charging template.

Please refer to fig. 5A, which is a timing diagram illustrating an operation of the electronic system 100 according to an embodiment of the invention. In fig. 5A, a first time period 510 for external object detection and a second time period 520 for stylus and board erase detection are included. The present invention does not limit the ratio of the first time period 510 to the second time period 520 to 1:1, nor does the first time period 510 and the second time period 520 have to be interactive. When the touch processing device 130 determines that only the external object is close to the touch panel 120, the proportion of the second time period 520 may be reduced. When the touch processing apparatus 130 determines that only the stylus and board eraser is close to the touch panel, the proportion of the first time period 510 can be reduced. The second period 520 includes a beacon signal transmission period 521, a stylus detection period 522 and an eraser detection period 523. In the present invention, the sequence of the stylus detection period 522 and the board detection period 523 is not limited, but the stylus detection period 522 and the board detection period 523 are after the beacon signal transmission period 521.

Please refer to fig. 5B, which is a variation of the embodiment of fig. 5A. In fig. 5B, the second period 520 is preceded by another beacon signal transmission period 524. After the beacon signal is sent in the time period 521, the stylus 110 and the touch processing device 130 perform a procedure of detecting the stylus 110 in the time period 522. After another beacon signal is sent in time period 524, the electronic board eraser 115 and the touch processing device 130 perform a detection procedure of the board eraser in time period 523. The stylus detection period 522 and the eraser detection period 523 do not necessarily need to be immediately after the period 521 and the period 524, respectively, and a blank (turning) period may be included in the middle for the stylus 110 and the electronic eraser 115 to perform receiving processing and preparation.

Please refer to fig. 5C, which is a variation of the embodiment of fig. 5A and 5B. In FIG. 5C, the detection of the stylus and the electronic eraser is performed at

discrete time intervals

530 and 540, respectively. This is because in the use habit, when using a stylus, an eraser is often not used. When using the eraser, the stylus is not used. Therefore, when the touch processing device 130 determines that only the stylus is near the touch panel, the ratio of the

time periods

510 and 540 can be reduced. When the touch processing device 130 determines that only the board eraser is close to the touch panel, the ratio of the

time periods

510 and 530 can be reduced.

Please refer to fig. 6A to 6G, which are timing diagrams illustrating operation of the stylus and board eraser detection period 520 according to the embodiment of the invention, which can be applied to the board eraser 115 in the embodiments of fig. 3A to 3F and 4. Although the embodiments illustrate the stylus and board erase detection period 520 in fig. 5A, it can be understood by those skilled in the art that the embodiments of fig. 5B and 5C can be applied if the stylus detection period 522 is omitted and the beacon signal transmission period 521 is replaced with the beacon signal transmission period 524.

In the embodiment of fig. 6A, during the time period 521, the sensing circuit 420 may detect the beacon signal emitted by the touch panel 120 through the sensing electrode 350. Then, in the embodiments of fig. 3C, 3E and 3F, the embedded processor 440 may enable the driving circuit 410 to transmit the same electrical signal with the first frequency to the touch panel 120 through the three erasing electrodes 341 to 343 for three periods 641 to 643. After the beacon signal is emitted, the touch processing device 130 can detect the electrical signal through each of the

touch electrodes

121 and 122 on the touch panel 120 to find the positions of the three erasing electrodes 341-343 relative to the touch panel 120.

Please refer to fig. 6B, which shows a variation of the embodiment of fig. 6A. Also applicable to the embodiments of fig. 3C, 3E and 3F, the embedded processor 440 may enable the driving circuit 410 to transmit the status information of the input device 310 and/or the battery 450 through at least one eraser electrode at a time period 611 after three time periods 641-643. For example, the first frequency is also used to transmit information, but the invention is not limited to the same signal modulation scheme. In a variation, the driving circuit 410 transmits the information through the three erasing electrodes 341-343 simultaneously during the period 611.

Please refer to fig. 6C, which is a variation of the embodiment shown in fig. 6B, and is suitable for the embodiment shown in fig. 3D. The difference from the embodiment of FIG. 6B is that the embedded processor 440 uses four time periods 641-644 to respectively enable the driving circuit 410 to emit signals of the same first frequency through the eraser electrodes 341-344. Since the user does not have to use the electronic board eraser 115 by putting the wiping surface 330 flat against the touch panel 120. The user may only use one corner or one side of the electronic eraser 115 to contact the touch panel 120, such that only one or two of the four eraser electrodes 341-344 are close to the touch panel 120, and the touch processing device 130 may not receive the electrical signals from two or three of the eraser electrodes. Therefore, in the time period 611, the driving circuit 410 transmits the information through the four erasing electrodes 341-344 at the same time to ensure that the information transmitted by at least one erasing electrode can be received.

Referring to fig. 6D, two frequency signals are utilized to shorten the time duration of the eraser detection period 523. The driving circuit 410 can simultaneously output two frequency signals to two erasing electrodes, for example, output a first frequency signal to the first erasing electrode 341 and simultaneously output a second frequency signal to the third erasing electrode 343. In other words, the first erase electrode transmission period 641 and the third erase electrode transmission period 643 may be overlapped. Then, the first frequency signal is outputted to the second eraser electrode 342, and the second frequency signal is outputted to the fourth eraser electrode 344. In other words, the second eraser electrode transmission period 642 and the fourth eraser electrode transmission period 644 may be overlapped. The invention does not limit which two eraser electrodes output simultaneously. The two frequencies may not be resonant frequencies of each other. After that, the aforementioned information transmission period 611 may also be added.

Referring to fig. 6E, signals with four frequencies are utilized to shorten the time duration of the erase detection period 523. The driving circuit 410 can simultaneously output signals with four frequencies to the four erase electrodes 341-344, so that the erase electrode transmission periods 641-643 are overlapped at the same time. The four frequencies may not be resonance frequencies of other frequencies. After that, the aforementioned information transmission period 611 may also be added. When applied to the embodiments of fig. 3C, 3E, and 3F, the frequency may be reduced from four to three.

Referring to fig. 6F, in addition to sending out an electrical signal to enable the touch processing device 130 to detect the position, each of the eraser electrodes 341 to 344 may also send out an electrical signal representing the pressure applied thereto. As described earlier, the embodiment shown in fig. 2 to 5 of US2015/0153845 or the variation of the technical solution shown in the example 201339904 can be used. In each of the transmission periods 641-644, each of the eraser electrodes 341-344 generates an electrical signal with two frequencies in time division for representing the pressure value applied to the eraser electrode.

Referring to FIG. 6G, as in FIG. 6F, each of the eraser electrodes 341-344 can emit an electrical signal representing the pressure applied thereto. As previously mentioned, variations of the solution shown in the related embodiments of fig. 7A-7D of US2015/0153845 may be used. In each of the transmission periods 641-644, each of the eraser electrodes 341-344 generates a modulated electrical signal in time division for representing the pressure value applied to the eraser electrode.

Please refer to fig. 7, which is a flowchart illustrating an eraser detection method according to an embodiment of the invention, and the method is applicable to the touch processing device 130 shown in fig. 2.

Step 710: a beacon signal is emitted through the plurality of touch electrodes of the touch panel 120. May be a lighthouse signal during

time period

521 or 524. The driving circuit 220 may be enabled to emit the beacon signal through all of the first electrodes 121, the driving circuit 220 may be enabled to emit the beacon signal through all of the second electrodes 122, or the driving circuit 220 may be enabled to emit the beacon signal through all of the first electrodes 121 and all of the second electrodes 122.

Step 721: after a predetermined period of time after step 710, the electric signal from the first eraser electrode 341 is detected by the

touch electrodes

121 and 122 on the touch panel 120, and it is determined that the first eraser electrode 341 is close to the touch panel 120.

Step 722: after a predetermined period of time after step 710, the electric signal from the second eraser electrode 342 is detected by the

touch electrodes

121 and 122 on the touch panel 120, and it is determined that the first eraser electrode 342 is close to the touch panel 120.

Step 723: after a predetermined period of time after step 710, the electrical signal from the third eraser electrode 343 is detected by the

touch electrodes

121 and 122 on the touch panel 120, and it is determined that the third eraser electrode 343 is close to the touch panel 120.

Optional step 724: after a predetermined time after step 710, the electric signal from the fourth eraser electrode 344 is detected by the

multiple touch electrodes

121 and 122 on the touch panel 120, and it is determined that the fourth eraser electrode 344 is close to the touch panel 120.

The steps 721 to 724 may be performed in time division as shown in fig. 6A to 6C and fig. 6F to 6G, or simultaneously as shown in fig. 6D to 6E.

Optional step 730: after a predetermined period of time after step 710, an electrical signal from at least one of the eraser electrodes 341-344 is detected by the

multi-touch electrodes

121 and 122 on the touch panel 120, and the state of the input device and/or the battery on the electronic eraser 115 is determined according to the electrical signal.

Step 740: several adjacent positions of the eraser electrodes are judged. If there is only one position indicating that the user has only one corner of the electronic blackboard eraser 115 to erase the handwriting, the flow proceeds to step 750/760. If there are two positions indicating that the user has wiped the writing with one side of the electronic blackboard eraser 115, the flow proceeds to step 755/765.

Optional step 750: and judging the pressure value corresponding to the position. The electrical signal can be demodulated to obtain the pressure applied to the eraser electrode. The pressure value may be determined based on the area size of the position.

Optional step 755: and judging the pressure values corresponding to the positions. The electrical signal can be demodulated to obtain the pressure experienced by the plurality of eraser electrodes. The corresponding pressure values may be determined according to the sum of the area sizes of the plurality of positions.

Step 760: the wiping area is determined based on the position (and the pressure value). If the pressure value can be calculated, the area of the wiping area can be changed according to the pressure value. For example, the larger the pressure value, the larger the area of the wiping area. The pressure value and the area value can be in direct proportion or have a non-linear relationship.

Step 765: determining a wiping area according to the plurality of positions (and the plurality of pressure values). If the pressure values can be summed or averaged, the area of the wiping area can be varied according to the pressure values. For example, the greater the sum or average of the pressure values, the greater the area of the wiping area. The sum or average of the pressure values may be proportional to the area value or have a non-linear relationship.

In another embodiment, the pressure value may be in a proportional or non-linear relationship to the rate of change of wiping in the wiping area. The wipe change rate here means how likely each pixel in the wipe region is to be wiped. For example, when the probability of wiping is 80%, 80% of pixels in the wiping area are wiped off, and the remaining 20% of pixels are unchanged.

In a further embodiment, the pressure value may be in a proportional or non-linear relationship to the rate of change of wiping in the wiping area. The wipe change rate here may be a change rate of each pixel in the wipe region. For example, the three colors of red, green and blue of the pixel have a value of R, G, B. When the wipe change rate is 80%, the change rate of the pixel over a certain period of time is 0.2R, 0.2G, 0.2B. The above changes can simulate the wiping effect of the traditional blackboard eraser on the traditional whiteboard.

In some application embodiments, the electronic board may be used as a brush. The input device 310 on the board eraser 115 may be utilized to switch the usage mode of the electronic board eraser. When the touch processing device 130 receives the state change of the input device 310 in step 730, it needs to notify the host 140 of the operating system and the application program executed by the host, so as to change the input mode of the electronic blackboard eraser.

In one embodiment, the embedded processor 440 of the electronic board eraser 115 may enter a power saving mode. For example, after the electronic board eraser 115 is placed under the touch panel 120 and still for a period of time, although the beacon signal can be received, if the processor 440 does not receive the activation signal from the accelerometer, gyroscope, or dynamic sensor, the eraser electrode will not send out the electric signal, so as to save power.

In another embodiment, the electronic eraser 115 is generally disposed near the touch panel 120. Therefore, the electronic eraser 115 may further comprise a wireless charging module for charging the battery 450 by using the beacon signal or the charging signal sent by the touch panel 120.

Please refer to fig. 8, which illustrates a control method of the electronic board eraser according to an embodiment of the present invention, which can be applied to the electronic board eraser 115 and the processor 440 of fig. 4.

Step 810: the sensing circuit in the electronic eraser senses the lighthouse signal from the touch panel through the sensing electrode of the electronic eraser.

Step 820: and enabling a driving circuit in the electronic eraser to provide electric signals to at least three eraser electrodes of the electronic eraser after a period of time after the lighthouse signal is received. The modulation method of the electric signal comprises one of the following: the electric signals with the same frequency set are sent out by the at least three eraser electrodes in time-sharing sequence; simultaneously sending state information through one or more of the eraser electrodes; simultaneously, sending out electric signals with different frequency sets through at least two eraser electrodes; and sending out electric signals with two different frequency sets through the at least three eraser electrodes in time-sharing sequence.

Fig. 9 is a schematic view showing two projection areas of the electronic board eraser on the touch screen 120 according to an embodiment of the invention. When the electronic board eraser is rectangular, the projection area 910 of the touch screen 120 is also rectangular when the electronic board eraser is laid flat. The rectangle has two short sides 911 and two long sides 912. The length of the long side 912 is greater than the short side 911.

When the electronic board eraser contacts the same position of the touch screen 120 at the upper left corner and the rest of the electronic board eraser leaves the touch screen 120, the area of the projection area 920 is smaller than that of the projection area 910. The length of the long side 922 of the projection area 920 is shorter than the long side 912 of the projection area 910. Similarly, the length of the short side 921 of the projection area 920 is shorter than the short side 911 of the projection area 910. Theoretically, when the upper left corner still contacts the touch screen 120, the ratio of the short edge 921 to the short edge 911 can be compared, and the first included angle between the short edge of the electronic board eraser and the touch screen 120 can be known. Similarly, the second angle between the long side of the electronic board eraser and the touch screen 120 can be known from the ratio of the long side 922 to the long side 921.

One of the prerequisites for calculating the included angle is to determine that the upper left corner of the electronic eraser touches the fluorescent touch screen 120. In the embodiment of fig. 3C and 3D, the electronic board eraser 115 has an eraser electrode 341 at a corner thereof. When the touch processing device 130 detects the eraser electrode 341 through the touch screen 120 and the eraser electrode 341 senses a pressure value, it can be determined that the upper left corner of the eraser electrode 341 contacts the touch screen 120.

As mentioned in the foregoing description, an electronic eraser may use a passive force sensor to detect whether the eraser electrodes are under pressure. As described in applicant's U.S. patent application No. US2015/0153845 and its priority documents. When the eraser electrode 341 emits an electrical signal having two frequencies or frequency groups, the intensity of the signal at one frequency or frequency group varies according to the variable impedance value of the force sensor. If the touch processing device detects that a proportional value of the signal intensities of the two frequencies or the frequency groups changes, it can be determined that the force sensor corresponding to the eraser electrode 341 is pressed. When the touch processing device receives the electrical signal in the time period corresponding to the eraser electrode 341, or detects a specific frequency representing the eraser electrode 341 in the received electrical signal, it can be determined that the upper left corner of the force sensor corresponding to the eraser electrode 341 is actually touching the touch screen 120, rather than just approaching the touch screen 120.

In other embodiments, the electronic eraser 115 may have force sensors corresponding to each corner. When the force sensor at the upper left corner senses a pressure, the pressure value can be transmitted to the touch processing device 130 or a signal receiver connected to the host 140 through the signal transmitter of the electronic blackboard eraser 115. The signal transmitter and the signal receiver may be wireless transmitters according to industry standards, such as Wireless Local Area Network (WLAN), bluetooth, ZigBee, etc. When the touch processing device 130 or the host 140 receives the non-zero pressure value of the upper left corner transmitted by the electronic board eraser and detects the electrical signal transmitted by the board eraser electrode 341, it can be determined that the upper left corner installed on the force sensor corresponding to the board eraser electrode 341 does touch the touch screen 120, rather than just being close to the touch screen 120. The touch screen 120 is not limited to the touch processing device 130 that determines the touch screen is touched by the electrical signal generated by the eraser electrode 341. More than two pieces of information can be received from different sources respectively for determining that a corner of the electronic blackboard eraser contacts the touch screen 120.

Furthermore, when the touch processing device 130 can determine that one corner of the electronic board eraser 115 contacts the touch screen 120, the same or different method can be used to determine that the other corner of the electronic board eraser 115 contacts the touch screen 120. When the two corners are adjacent corners, it can be determined that one side of the electronic board wiper 115 contacts the touch screen 120. When the two angles are opposite angles, it can be determined that the bottom surface or the wiping surface of the electronic board eraser 115 contacts the touch screen 120.

When only one corner of the electronic board eraser 115 contacts the touch screen 120, the approach positions of two adjacent corners of the corner can be further determined. In the embodiment shown in fig. 3C or fig. 3D, the touch processing device 130 determines the positions of the two

eraser electrodes

342 and 343 near the touch screen 120 according to the electrical signals emitted by the

eraser electrodes

342 and 343. In other words, the two corners corresponding to the two

eraser electrodes

342 and 343 are free, and the two force sensors at the two corners are not under pressure.

In the above embodiment, the ratio of the signal intensities of the two frequencies or frequency groups in the electrical signal emitted from the eraser electrode 342 is kept constant. It can be determined that the eraser electrode 342 is not stressed. The same method can also be used to determine that the

eraser electrodes

343 and 344 are not stressed. In another embodiment, when the force sensors corresponding to three corners of the electronic board eraser 115 are not under stress, the force sensors can be transmitted to the touch processing device 130 or the signal receiver connected to the host 140 via the signal transmitter.

When the two adjacent corners of the eraser electrodes 341 touching the touchscreen 120 are not stressed, the touch processing device 130 can calculate the position of the touch screen 120 close to the touch processing device according to the electrical signals sent by the

corresponding eraser electrodes

342 and 343. Since the distance between the opposite-corner eraser electrode 344 touching the eraser electrode 341 of the touchscreen 120 and the touchscreen 120 is greater than or equal to the distance between the

eraser electrode

342 or 343 and the touchscreen 120, the touch processing device 130 may not be able to find the position of the eraser electrode 344 close to the touchscreen 120 according to the relatively weak electrical signal.

In the embodiment shown in fig. 9, the touch processing device 130 can find the

positions

941, 942, 943 and 944 according to the electrical signals transmitted by the

eraser electrodes

341, 342, 343 and 344. When the corner corresponding to the position 941 is pressed, it can be determined that the eraser electrode 341 contacts the touch screen 120. The three corners corresponding to the remaining

positions

942, 943 and 944 are not pressed, so that it can be determined that the wiping

electrodes

342, 343 and 344 are not in contact with the touch screen 120.

Locations

941 and 942 form a short side 921 and

locations

941 and 943 form a long side 922. Since the lengths of the short edge 911 and the short edge 921 of the electronic board eraser 115 are known, the ratio of the

short edges

921 and 911 can be used to calculate the first included angle between the short edge 921 and the touch screen 120. Similarly, since the lengths of the long side 912 and the long side 922 of the electronic eraser 115 are known, the second angle between the long side 922 and the touch screen 120 can be calculated by using the ratio of the

long sides

922 and 912.

If the touch processing device 130 can find the

corresponding positions

941, 942, 943 and 944, the projected area 920 can be formed by using the connection lines of the four positions as the boundaries. Although the rectangular electronic board eraser 115 shown in fig. 3C or 3D is used as an example, the shape of the electronic board eraser 115 is not limited to a rectangle. In other embodiments, the projected shape of the plurality of eraser electrodes at the plurality of vertices may be any quadrilateral, such as a diamond, a parallelogram, a trapezoid, a square, etc. The projected shape may also be any polygon, such as three, five, six, etc. In one embodiment, the projection area 920 is a wiping area corresponding to a window of a drawing application, or the wiping area can be regarded as a color brush area with a certain background color. For example, when the background color is white, the color of the wiping area corresponding to the projection area 920 may be changed to white.

When the touch processing device 130 knows the projection shape of the electronic board eraser 115 in advance, the posture of the electronic board eraser 115 relative to the touch screen 120 can be known according to two included angles between the two sides extending from the contact point and the touch screen 120. In another embodiment, the electronic eraser 115 may comprise more than one detecting device such as a gyroscope, an accelerometer, an angular accelerometer, an electronic compass, etc. for detecting the posture of the electronic eraser 115 with respect to the ground. The host 140 may also include one or more detecting devices such as a gyroscope, an accelerometer, an angular accelerometer, and an electronic compass, or a preset value, which can measure the posture of the touch screen 120 with respect to the ground. After the electronic board eraser 115 transmits the ground gesture to the host 140, the host 140 can calculate the gesture of the electronic board eraser 115 relative to the touch screen 120 according to the two gestures of the electronic board eraser 115 and the touch screen 120 relative to the ground.

Please refer to fig. 10, which is a schematic view of an attitude axis of the electronic blackboard eraser according to an embodiment of the invention. The XY plane of the three-dimensional reference frame 1000 of fig. 10 is the plane of the touch screen 120. The Z-axis is an axis perpendicular to the XY-plane. The origin of the three-dimensional reference frame 1000 can be set to a point where a corner of the electronic blackboard eraser 115 contacts the touch screen 120, such as the location 941 of FIG. 9. In this embodiment, the electronic eraser 115 may set a first virtual direction or vector. For example, two

opposite corner electrodes

341 and 344 of the electronic board eraser 115 can be used as the first virtual vector 1010. When the electronic board eraser 115 is laid flat on the touch screen 120, the first virtual vector 1010 is located on the XY plane. When the electronic board eraser 115 contacts the touch screen 120 only by the eraser electrode 341, the first virtual vector 1010 is a three-dimensional vector emitted from the position 941. A projection vector 1020 of the first virtual vector 1010 projected on the XY plane may be a vector from a position 941 to a position 944.

In order to correctly represent the posture of the electronic board eraser 115 corresponding to the touch screen 120, a second virtual vector 1030 can be further set. The second virtual vector 1030 may not be parallel to the first virtual vector 1010. In the embodiment shown in fig. 10, the second virtual vector 1030 may be a vector extending upward from the plate wiping electrode 941 toward the Z-axis, which is perpendicular to the first virtual vector 1010. When the electronic board eraser 115 is laid flat on the touch screen 120, the second virtual vector 1030 is perpendicular to the XY plane. It can be understood by those skilled in the art that the posture of the electronic board eraser 115 relative to the touch screen 120 can be represented by the first virtual vector 1010 and the second virtual vector 1030 in the three-dimensional reference coordinate system shown in fig. 10.

The invention is not limited to the relationship between the two

virtual vectors

1010 and 1030 with respect to the electronic board eraser 115, as long as the two virtual vectors are not parallel to each other. In other words, the posture of the electronic board eraser 115 relative to the touch screen 120 can be represented by two virtual vectors. When the touch processing device 115 knows the position of each of the eraser electrodes of the electronic eraser 115 in advance, and the relationship between the two virtual vectors and the electronic eraser, it can be understood by those skilled in the art that the first virtual vector 1010 and the second virtual vector 1030 in the three-dimensional reference coordinate system can be calculated by using the data of the short edge 921 and the long edge 922 shown in fig. 9. On the contrary, after the first virtual vector 1010 and the second virtual vector 1030 in the three-dimensional reference coordinate system are obtained, the data of the short edge 921 and the long edge 922 can be calculated. The two are interchangeable.

In an embodiment of the present invention, the size and/or shape of the cursor or wiping area can be determined according to one of the two

virtual vectors

1010 and 1030, or the projection vector 1020 of the first virtual vector 1020. In another embodiment, the size and/or shape of the cursor or wiping area can be determined according to the short side 921 and the long side 922 projected on the touch screen 120. In a further embodiment, the posture of the electronic board eraser 110 relative to the touchscreen 120 can be calculated according to the posture of the electronic board eraser 115 relative to the ground and the posture of the touchscreen 120 relative to the ground, so as to further determine the size and/or shape of the cursor or the wiping area.

In one embodiment, when the touch screen 120 is a curved surface, the Z-axis of the reference coordinate system shown in fig. 10 is a normal of the position 941. In other words, the postures of the electronic board eraser 115 and the touch screen 120 are determined according to the positions 941 where the electronic board eraser 115 and the touch screen are in contact with each other, and the three axial directions X, Y, Z of the reference coordinate system are determined.

Please refer to fig. 11A to 11C, which are schematic diagrams of an attitude side view and a wiping area according to three embodiments of the present invention. The left side is a side view of the electronic board eraser 115 contacting the touchscreen 115 at a single edge, and the right side is a top view of the wiping area of the touchscreen 120. In the embodiment shown in fig. 11A, when the electronic board eraser 115 shown in fig. 3C or fig. 3D is flatly placed on the touch screen 120, the wiping area 1110 is similar to the projection area of the electronic board eraser 115 on the touch screen 120. The size ratio of the two is about one to one. The wiping area 1110 may be slightly larger than the projected area to uniformly protrude the projected area so that the electronic board eraser 115 completely blocks the user's view and the edge of the wiping area 1110 is not visible to the user.

In the embodiment shown in fig. 11B, when the electronic board eraser 115 contacts the touch screen 120 at one side, an included angle between the erasing surface and the touch screen 120 is a first included angle 1102. For example, when the long side 912 of the electronic board wiper 115 contacts the touch screen 120, the first included angle 1102 is the included angle between the short side 921 and the touch screen 120. On the contrary, when the short side 911 of the electronic board eraser 115 contacts the touch screen 120, the first included angle 1102 is the included angle between the long side 922 and the touch screen 120. At this time, the area of the corresponding wiping area 1120 is smaller than that of the wiping area 1120. In one embodiment, the area of the wiping region 1120 is related to the area of the wiping region 1110 and the first angle 1102. For example, the area of the wiping region 1120 can be the product of the area of the wiping region 1110 and a function of the first angle 1102. The function may be linear or non-linear.

In the embodiment shown in fig. 11C, the second included angle 1103 of the electronic board eraser 115 and the touch screen 120 is larger than the first included angle 1102. At this time, the area of the wiping area 1130 is smaller than that of the wiping area 1120. Similarly, the area of the wiping area 1130 is related to the area of the wiping area 1110 and the second included angle 1103. For example, the area of the wiping region 1120 can be the product of the area of the wiping region 1110 and a function of the second angle 1103. The function may be linear or non-linear. In one embodiment, the strip-shaped wiping area has a minimum area, and when the included angle between the wiping surface and the touch screen 120 is greater than the threshold value, the area of the wiping area is not reduced.

Please refer to fig. 12, which is a diagram illustrating shapes of wiping areas according to various embodiments of the present invention. In fig. 12, three symmetrically shaped wiping areas are included. Wiping

areas

1210, 1220, 1230, 1260 and 1270 are isosceles triangles. Wiping area 1240 is of a water droplet type. The wiping area 1250 is a quadrilateral of a cluster of arrows. When the single angle of the electronic board eraser 115 contacts the touch screen 120, the erasing area can be changed to one of the above shapes. The shape shown in fig. 12 is merely an exemplary shape, and the present invention is not limited to the shape of the wiping area.

In one embodiment, the angle of orientation of the wiping area may correspond to this position 941. In an example, the opening angle 1214 of the pointing angle of the wiping area may correspond to the angle between the short edge 921 and the touch screen 120. In another example, the open angle 1214 of the wiping area can correspond to the angle between the long side 922 and the touch screen 120. In a further example, the opening angle 1214 of the pointing angle may correspond to a function value corresponding to the included angle between the short side 921 and the touch screen 120 and the included angle between the long side 922 and the touch screen 120. For example, the flare angle 1214 of the pointing angles of the

wiping areas

1210, 1220, and 1230 is from large to small.

In one embodiment, the orientation 1212 of the wiping area may correspond to the projection vector 1020 shown in FIG. 10. The length of the wipe region may correspond to the length of projection vector 1020. For example, as the angle between the wiping surface of the electronic board wiper 115 and the plane of the touch screen is larger, the length thereof is shorter, and the area thereof is smaller. The

wiping areas

1230, 1260 and 1270 have a decreasing area, and the angle between the wiping areas and the plane of the touch screen 120 is decreasing. The size of the area of the wiping surface corresponds to an included angle between the wiping area and the plane of the touch screen 120. In one embodiment, the wiping area has a minimum area, and when the included angle between the wiping surface and the touch screen 120 is greater than the threshold value, the area of the wiping area is not reduced.

Please refer to fig. 13, which is a diagram illustrating shapes of a symmetric wiping area and an asymmetric wiping area according to various embodiments of the present invention. As can be seen in FIG. 13, in addition to the isosceles triangular wiping area 1210, which is left-right symmetric, a triangular wiping area 1310 is included that is left-right asymmetric. The top corner of the wiping area 1310 is divided into two

angles

1311 and 1312. In one embodiment, the two

angles

1311 and 1312 may correspond to an included angle between the short side 921 and the touch screen 120 and an included angle between the long side 922 and the touch screen 120, respectively. Or vice versa, the two

angles

1312 and 1311 may correspond to the included angle between the short side 921 and the touch screen 120 and the included angle between the long side 922 and the touch screen 120, respectively.

In one embodiment, the wiping region 1310 can include a first wiping region and an adjacent second wiping region. The shape and size of the first wiping area correspond to the short edge 921 and the included angle of the touch screen 120. The shape and size of the second wiping area correspond to the included angle between the long side 922 and the touch screen 120. In an example, when the included angle between the short edge 921 and the touch screen 120 corresponds to the included angle between the long edge 922 and the touch screen 120, the first wiping area is symmetrical to the second wiping area.

Please refer to fig. 14A-14C, which are schematic diagrams illustrating the wiping change rate in the wiping area according to various embodiments of the present invention. In these three plots, the darker the color, the greater the wipe change rate. The wiping area shown in fig. 14A had the largest rate of change of wiping at the tip. The farther from the tip, the smaller the wipe change rate. In contrast, in the wiping area shown in fig. 14B, the smallest rate of change in wiping is the tip. The closer to the tip, the smaller the wipe change rate. In the embodiment shown in fig. 14A and 14B, the change in the rate of change of the wipe is linear. The present invention is not limited to the change in the wipe rate of change being linear.

The maximum value and/or the minimum value of the wipe change rate may be set. Or the maximum value of the wiping change rate is adjusted accordingly according to the pressure to which the wiper electrode 341 is subjected. In one embodiment, the wipe rate of change of the wipe zones may be the same, with the maximum value of the wipe rate of change again being based on the pressure experienced by the wipe electrode 341. The wipe rate of change may be between 0% and 100%.

In the four embodiments shown in fig. 14C, the wipe change rate is uniform across the wipe region according to the pressure applied to a corner touching the touch screen 120. The pressure corresponding to the rightmost wiping area is the greatest and the pressure corresponding to the leftmost wiping area is the least.

It can be understood by those skilled in the art that the pressure applied to the eraser electrode 341 in the present invention can be equivalent to the pressure applied to a corner touching the touch screen 120. According to the principle that the acting force and the reacting force are equal, the touch screen 120 may be pressed by the corner of the electronic board 115.

Please refer to fig. 15, which is a flowchart illustrating a method for setting a wiping area according to an embodiment of the present invention. The method for setting the wiping area can be applied to the host 140 of fig. 1, and includes the following steps:

step 1510: and receiving the posture and the contact pressure of the electronic blackboard eraser corresponding to the touch screen. The gesture referred to in the present invention refers to a position of the electronic board eraser corresponding to the touch screen.

In one embodiment, the host 140 can receive the gesture and the contact pressure of the electronic board eraser corresponding to the touch screen, which are calculated by the touch processing device 130, wherein the touch processing device 130 calculates the position by receiving the electric signal sent by each eraser electrode of the electronic board eraser through each touch electrode on the touch screen 120, and the contact pressure is also known through the electric signal. After the proximity positions of the eraser electrodes are known, the posture of the electronic eraser corresponding to the touch screen can be calculated according to the relative positions of the eraser electrodes of the electronic eraser.

In an example, the electrical signals of each of the two sets of the frequencies include two sets of the frequencies, and the touch processing device determines that the pressure applied to the eraser electrode is zero when the intensity ratio of the two sets of the frequencies is a predetermined value. When the intensity ratio of the electrical signals of the two frequency sets is not the preset value, the touch processing device judges that the pressure applied on the eraser electrode is greater than zero. In one example, the electrical signal emitted by each of the eraser electrodes over a period of time includes information about the modulated pressure value. The touch processing device demodulates the electric signal in the time interval to obtain the information of the pressure value.

In another embodiment, the host 140 can receive at least one contact pressure information from the electronic board eraser through a wired or wireless connection from a channel outside the touch processing device 130, and then calculate the posture of the electronic board eraser corresponding to the touch screen according to the touch processing device 130 receiving the electrical signals of the board eraser electrodes of the electronic board eraser and the relative positions between the board eraser electrodes of the electronic board eraser.

Step 1520: is it determined whether the electronic board eraser has at least one corner contacting the touch screen? Whether the electronic board eraser contacts the touch screen can be determined according to the contact pressure received in step 1510. When the contact pressure values are all zero, the electronic board wiper is not contacted with the touch screen. Flow may proceed to step 1540. When at least one corner of the electronic eraser contacts the touch screen, the process proceeds to step 1530.

Step 1530: determining the properties of the wiping area according to the gesture and/or the contact pressure.

In one embodiment, the shape of the wiping area is determined according to the contact state of the electronic board eraser and the touch screen. For example, when the wiping surface of the electronic board wiper is flatly attached to the touch screen, the shape of the wiping area corresponds to the shape of the wiping surface. When one side of the wiping surface contacts the touch screen, the wiping area may be quadrilateral. When one corner of the wiping surface is in contact with the touch screen, the shape of the wiping area can be a directional shape, and the directional shape and the direction of the directional shape correspond to the gesture.

In one embodiment, the shape includes a pointing angle, and the pointing angle corresponds to an angle between the wiping surface and the touch screen. When the included angle between the wiping surface and the touch screen is larger, the angle of the pointing angle is smaller.

In one embodiment, the size of the wiping area corresponds to one of the following parameters or any combination thereof: an included angle between the wiping surface and the touch screen; the contact pressure of the corner; the average contact pressure of the edge.

In one embodiment, the rate of change of wiping within the wiping zone is uniform. In one embodiment, the wipe rate of change corresponds to the angular contact pressure.

In one embodiment, the rate of change of wiping within the wiping zone is not uniform. In one embodiment, the change in the wipe change rate corresponds to the directionality of the shape of the directivity.

In one embodiment, the shape of the directivity is asymmetric. In an embodiment, the shape of the directivity corresponds to two angles between two adjacent sides of the corner and the touch screen.

In one embodiment, when the touch screen is a curved surface, the attitude is a local plane relative to the position of the angle contacting the touch screen.

Step 1540: pause for a period of time. When the electronic board eraser leaves the touch screen, the electronic board eraser can temporarily leave time for other operation modes of the touch processing device, such as a mode for detecting an external conductive object or a mode for detecting a touch pen.

In one embodiment, the wiping area may be controlled in order to allow the user to experience the gesture of the electronic blackboard eraser, wherein the size of the wiping area corresponds to one of the following parameters or any combination thereof: an included angle between the wiping surface and the touch screen; the contact pressure of the corner; and the average contact pressure of the wiping surface and the side of the touch screen. In one embodiment, to allow a user to control the wipe rate of change with contact pressure, wherein the wipe rate of change within the wiping area is uniform, the wipe rate of change corresponds to the angular contact pressure. The average contact pressure may be an average of the contact pressures at the two corners that determine the edge. In one embodiment, to simulate the wiping scenario of a conventional eraser, in which the rate of change of wiping within the wiping area is not uniform, the change in the rate of change of wiping corresponds to the orientation of the shape of the directivity, i.e., the embodiment shown in fig. 14A or 14B. In one embodiment, in order to reflect that the shape of the electronic blackboard eraser is asymmetric corresponding to the contact angle, wherein the shape of the directivity is asymmetric, and the shape of the directivity corresponds to two angles between two adjacent sides of the angle and the touch screen. In one embodiment, to enable the control of the electronic board eraser to be applied to a curved touchscreen, wherein when the touchscreen is curved, the gesture is a local plane relative to the position where the corner contacts the touchscreen.

In one embodiment, the wiping area may be controlled in order to allow the user to experience the gesture of the electronic blackboard eraser, wherein the size of the wiping area corresponds to one of the following parameters or any combination thereof: an included angle between the wiping surface and the touch screen; the contact pressure of the corner; and the average contact pressure of the wiping surface and the side of the touch screen. The average contact pressure may be an average of the contact pressures at the two corners that determine the edge. In one embodiment, to allow a user to control the wipe rate of change with contact pressure, wherein the wipe rate of change within the wiping area is uniform, the wipe rate of change corresponds to the angular contact pressure. In one embodiment, to simulate the wiping scenario of a conventional eraser, in which the rate of change of wiping within the wiping area is not uniform, the change in the rate of change of wiping corresponds to the orientation of the shape of the directivity, i.e., the embodiment shown in fig. 14A or 14B. In one embodiment, in order to reflect that the shape of the electronic blackboard eraser is asymmetric corresponding to the contact angle, wherein the shape of the directivity is asymmetric, and the shape of the directivity corresponds to two angles between two adjacent sides of the angle and the touch screen. In one embodiment, to enable the control of the electronic board eraser to be applied to a curved touchscreen, wherein when the touchscreen is curved, the gesture is a local plane relative to the position where the corner contacts the touchscreen.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for setting a wiping area, comprising:

receiving the posture and the contact pressure of the electronic blackboard eraser corresponding to the touch screen;

judging whether at least one corner of the electronic blackboard eraser contacts the touch screen; and

when at least one corner of the wiping surface of the electronic board wiper contacts the touch screen, the attribute of the wiping area is determined according to any combination of the gesture and the contact pressure.

2. The method of claim 1, wherein the gesture and the contact pressure are received from a touch processing device connected to the touch screen, and the touch processing device receives electrical signals from a plurality of eraser electrodes of the electronic eraser through touch electrodes included in the touch screen, so as to calculate the gesture and the contact pressure according to relative positions between the electrical signals and the eraser electrodes.

3. The method of claim 1, further comprising:

receiving the contact pressure from the electronic blackboard eraser;

receiving a plurality of proximity events of a plurality of eraser electrodes of the electronic eraser corresponding to the touch screen from the touch processing device; and

and solving the posture and the contact pressure according to the proximity events, the contact pressure and the relative positions of the plurality of eraser electrodes.

4. The method of claim 1, wherein the step of determining the properties of the wiping area further comprises:

when only one corner of the wiping surface is in contact with the touch screen, the shape of the wiping area is a directional shape, and the directional shape and the direction of the directional shape correspond to the gesture.

5. The method of claim 1, wherein the shape of the wiping area comprises a pointing angle, the pointing angle corresponding to an angle between the wiping surface and the touch screen, the pointing angle being smaller when the angle between the wiping surface and the touch screen is larger.

6. The wiping area setting method according to claim 1, wherein the size of the wiping area corresponds to one of the following parameters or any combination thereof:

an included angle between the wiping surface and the touch screen;

the contact pressure of the corner; and

the average contact pressure of the wiping surface and the side of the touch screen.

7. The wiping area setting method according to claim 4, wherein a wiping change rate inside the wiping area is uniform, the wiping change rate corresponding to the contact pressure of the angle.

8. The wiping area setting method according to claim 4, wherein a rate of change of wiping inside the wiping area is non-uniform, and a change of the rate of change of wiping corresponds to a direction of the shape of the directivity.

9. The method of claim 4, wherein the directional shape is asymmetric, and the directional shape corresponds to two angles between two adjacent sides of the corner and the touch screen.

10. The method of claim 4, wherein when the touch screen is curved, the gesture is a local plane relative to a position of the touch screen at the corner.

11. An electronic system for wipe zone setting, comprising:

a touch processing device connected to the touch screen; and

a host connected to the touch processing device for executing the program stored in the non-volatile memory to realize the following steps:

12. The electronic system of claim 11, wherein the gesture and the contact pressure are received from the touch processing device, and the touch processing device receives electrical signals from a plurality of eraser electrodes of the electronic eraser through touch electrodes included in the touch screen, so as to calculate the gesture and the contact pressure according to relative positions between the electrical signals and the eraser electrodes.

13. The electronic system of claim 11, further comprising:

a signal receiver connected to the electronic eraser for receiving the contact pressure from the signal transmitter of the electronic eraser,

wherein the host is connected to the signal receiver and is further configured to execute a program stored in the non-volatile memory to perform the following steps:

14. The electronic system of claim 11, wherein the step of determining the attributes of the wiping area further comprises:

15. The electronic system of claim 11, wherein the shape of the wiping area comprises a pointing angle, the pointing angle corresponding to an angle between the wiping surface and the touch screen, the pointing angle being smaller when the wiping surface is at a larger angle to the touch screen.

16. The electronic system of claim 11, wherein the size of the wiping area corresponds to one of the following parameters or any combination thereof:

an included angle between the wiping surface and the touch screen;

the contact pressure of the corner; and

17. The electronic system of claim 14, wherein a rate of change of wiping within the wiping area is uniform, the rate of change of wiping corresponding to the contact pressure of the corner.

18. The electronic system of claim 14, wherein a rate of change of wiping within the wiping zone is non-uniform, the rate of change of wiping changing corresponding to a direction of the shape of the directivity.

19. The electronic system of claim 14, wherein the directional characteristic is asymmetric in shape, and the directional characteristic has a shape corresponding to two angles between two adjacent sides of the corner and the touch screen.

20. The electronic system of claim 14, wherein when the touch screen is curved, the gesture is a local plane relative to a position of the angle contacting the touch screen.

21. The electronic system of any one of claims 11-20, further comprising the touch screen and the electronic board eraser.