Touch driving integrated circuit, operation method thereof and touch device

Abstract

A touch driving integrated circuit, an operating method thereof and a touch device are disclosed. The touch driving integrated circuit is used to drive a touch panel. The touch driving integrated circuit includes a touch interface circuit and an operation circuit. The touch interface circuit is coupled to the touch panel. The touch interface circuit communicates with an active pen. The operation circuit is coupled to the touch interface circuit. In response to a tip or a tail of the active pen touching the touch panel, the operation circuit determines a touch position of the active pen. Based on a touch pen posture information, the operation circuit determines to perform an erasing operation or a writing operation, wherein the touch pen posture information includes a relative angle between an inclination angle of the active pen and an inclination angle of the touch panel.

Description

Technical Field

[0001] This invention relates to a touch technology, and more particularly to a touch driver integrated circuit, its operation method, and a touch device. Background Technology

[0002] Users' demand for input methods such as writing and drawing on touch devices using styluses is increasing daily, leading to the emergence of various stylus products (passive or active). Based on these styluses, touch panels and touch driver integrated circuits (ICs) also need corresponding functionalities. Summary of the Invention

[0003] This invention provides a touch driver integrated circuit, its operation method, and a touch device for precisely triggering the erase mode.

[0004] In an embodiment of the present invention, the aforementioned touch driver integrated circuit is used to drive a touch panel. The touch driver integrated circuit includes a touch interface circuit and a computing circuit. The touch interface circuit is configured to be coupled to the touch panel and configured to communicate with an active stylus. The computing circuit is coupled to the touch interface circuit. The computing circuit is configured to determine the touch position of the active stylus in response to the tip or tail of the active stylus touching the touch panel. The computing circuit determines whether to perform an erase operation or a writing operation based on stylus posture information, wherein the stylus posture information includes the relative tilt angle between the tilt angle of the active stylus and the tilt angle of the touch panel.

[0005] In an embodiment of the present invention, the above-described operation method includes: a touch interface circuit of a touch driver integrated circuit communicating with an active pen; in response to the pen tip or pen tail touching a touch panel, a computing circuit of the touch driver integrated circuit determining the touch position of the active pen; and determining whether to perform an erasing operation or a writing operation based on the pen posture information, wherein the pen posture information includes the relative tilt angle between the tilt angle of the active pen and the tilt angle of the touch panel.

[0006] In an embodiment of the present invention, the touch device includes a system processor, a touch panel, and a touch driver integrated circuit. The touch driver integrated circuit is coupled to the system processor and the touch panel. The touch driver integrated circuit is configured to drive the touch panel, communicate with an active pen, and perform an erasing or writing operation based on stylus posture information, wherein the stylus posture information includes a relative tilt angle between the tilt angle of the active pen and the tilt angle of the touch panel.

[0007] Based on the above, the active pen described in the embodiments of the present invention can provide stylus posture information to the touch driver integrated circuit of the touch device. The computing circuit of the touch driver integrated circuit can process the stylus posture information to determine the relative tilt angle between the tilt angle of the active pen and the tilt angle of the touch panel. Based on the stylus posture information containing the relative tilt angle, the computing circuit can determine to execute the corresponding operation, such as an erasing operation, a writing operation, or other active pen operations. Therefore, the computing circuit can automatically and accurately trigger the erasing mode for the active pen.

[0008] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0009] Figure 1A and Figure 1B This is a schematic diagram illustrating different operating scenarios of a touch system according to an embodiment of the present invention;

[0010] Figure 2 This is a schematic diagram of a circuit block of a touch device according to an embodiment of the present invention;

[0011] Figure 3 This is a flowchart illustrating an operation method of a touch driver integrated circuit according to an embodiment of the present invention;

[0012] Figure 4 This is a circuit block diagram of a touch interface circuit and an arithmetic circuit according to an embodiment of the present invention;

[0013] Figure 5 This is a circuit block diagram of a touch device according to another embodiment of the present invention.

[0014] Symbol Explanation

[0015] 100: Touchscreen system

[0016] 110, 510: Touch screen device

[0017] 120: Active pen

[0018] 210: Touch panel

[0019] 220: Touch driver integrated circuit

[0020] 221, 521: Touch interface circuit

[0021] 223, 523: Operational circuits

[0022] 230, 530: System processors

[0023] 240, 540: Wireless communication interface

[0024] 250, 550: Attitude sensor

[0025] 411: Analog Front-End Circuit

[0026] 412: Digital back-end circuit

[0027] 421: Firmware

[0028] 422: Microcontroller

[0029] 515: Touch display panel

[0030] 520: Touch and Display Driver Integration (TDDI) Chip

[0031] 525: Display driver circuit

[0032] DL: Downlink signal

[0033] ER: Erase signal

[0034] S310, S320, S330: Steps

[0035] UL: Uplink signal Detailed Implementation

[0036] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element references are used in the drawings and description to denote the same or similar parts.

[0037] The term "coupled (or connected)" as used throughout this specification (including the claims) may refer to any direct or indirect means of connection. For example, if the text describes a first device coupled (or connected) to a second device, it should be interpreted as the first device being directly connected to the second device, or the first device being indirectly connected to the second device through other devices or some means of connection. The terms "first," "second," etc., used throughout this specification (including the claims) are used to name components or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of components, nor to limit the order of components. Furthermore, wherever possible, components / components / steps using the same reference numerals in the drawings and embodiments represent the same or similar parts. Components / components / steps using the same reference numerals or the same terms in different embodiments may be referred to mutually in the relevant descriptions. It should be understood that the features of the following embodiments can be combined with each other. For example, the features of the second embodiment can be combined with the features of the first embodiment. Those skilled in the art can select appropriate combinations of features according to actual design requirements.

[0038] Figure 1A and Figure 1B This is a schematic diagram illustrating different operating scenarios of the touch system 100 according to an embodiment of the present invention. Figure 1A and Figure 1B The touch system 100 shown includes a touch device 110 and an active stylus 120. The touch device 110 can detect touch events occurring on the touch panel. A touch event here refers to an object (such as an active stylus, a finger, or other object) directly touching or hovering on the touch panel.

[0039] Based on practical applications and design, the touch panel of the touch device 110 can be integrated into the touch display panel, and the touch driver integrated circuit of the touch device 110 may include a display driver circuit (not shown). When the display driver circuit is embedded in the touch driver integrated circuit, a touch and display driver integration (TDDI) chip can be formed. The display driver circuit is configured to drive the touch display panel to display multiple image frames based on the touch position reported by the active pen 120, wherein the image frames display writing or erasing trajectories formed by the movement of the active pen 120.

[0040] Figure 1A The demonstrated operating scenario is that the tip of the active pen 120 touches (either directly or by hovering over) the touch panel of the touch device 110. That is, Figure 1A This demonstrates the writing posture of the active pen 120. The tip of the active pen 120 can sense the uplink signal (UL) emitted by the touch panel of the touch device 110. Based on the triggering of the uplink signal (UL), the tip of the active pen 120 can emit a downlink signal (DL) to the touch panel of the touch device 110. In response to the tip of the active pen 120 touching the touch panel of the touch device 110, the touch device 110 can sense and determine the touch position of the active pen 120 on the touch panel. Based on the touch position of the tip of the active pen 120 on the touch panel, the touch device 110 can perform a writing operation.

[0041] Figure 1B The demonstrated operating scenario is that the end of the active pen 120 touches (either directly or by hovering over) the touch panel of the touch device 110. That is, Figure 1BThis demonstrates the erasing action of the active pen 120. The stylus 120 emits an erase signal ER to the touch panel of the touch device 110. Depending on the design and application, the erase signal ER can be a DC signal, a ground signal, or another signal. In response to the stylus 120 touching the touch panel of the touch device 110, the touch device 110 can sense and determine the touch position of the stylus 120 on the touch panel. Based on the touch position of the stylus 120 on the touch panel, the touch device 110 can perform an erase operation.

[0042] Figure 2 This is a schematic diagram of a circuit block of a touch device 110 according to an embodiment of the present invention. Figure 2 The touch device 110 shown can be used as Figure 1A and Figure 1B One of many embodiments of the touch device 110 shown. Figure 2 The touch device 110, stylus 120, uplink signal UL, downlink signal DL, and erase signal ER shown can be referenced. Figure 1A and Figure 1B The relevant explanations are omitted here. Figure 2 In the illustrated embodiment, the touch device 110 includes a touch panel 210, a touch driver integrated circuit 220, a system processor 230, a wireless communication interface 240, and a gesture sensor 250. The touch driver integrated circuit 220 is coupled to the system processor 230 and the touch panel 210. The touch driver integrated circuit 220 is configured to drive the touch panel 210.

[0043] Generally, the active pen 120 is equipped with an attitude sensor to measure its tilt angle. Depending on the specific design and application, the attitude sensor may include an inertial measurement unit (IMU) or other tilt measuring devices. An inertial measurement unit, also known as a multi-axis motion sensor, typically integrates multiple sensing components, such as an accelerometer, gyroscope, and magnetometer. In some applications, the touch driver integrated circuit 220 can communicate with the active pen 120 via the touch panel 210 to obtain tilt angle information. In other application scenarios, the system processor 230 can receive the tilt angle information of the active pen 120 from the active pen 120 via the wireless communication interface 240. The touch driver integrated circuit 220 can obtain the tilt angle information of the active pen 120 and the touch panel 210 from the system processor 230, and can calculate the relative tilt angle between the active pen 120 and the touch panel 210. Depending on the actual design and application, the wireless communication interface 240 may include a Bluetooth channel or other wireless communication channels. In other application scenarios, the system processor 230 can calculate the relative tilt angle between the active pen 120 and the touch panel 210, and then transmit the relative tilt angle information to the touch driver integrated circuit 220, without the touch driver integrated circuit 220 needing to calculate the relative tilt angle itself.

[0044] In response to the pen tip or end of the active pen 120 touching the touch panel 210, the touch driver integrated circuit 220 can sense and determine the touch position of the active pen 120 on the touch panel 210. The touch driver integrated circuit 220 determines whether to perform an erasing or writing operation based on the pen posture information, wherein the pen posture information (including relative tilt angle information) can be generated by the touch driver integrated circuit 220 or by the system processor 230.

[0045] Based on the control of the system processor 230, the touch driver integrated circuit 220 drives the touch panel 210 to detect touch events. Figure 2In the illustrated embodiment, the touch driver integrated circuit 220 includes a touch interface circuit 221 and a processing circuit 223. The touch interface circuit 221 is coupled to the touch panel 210 and the processing circuit 223, while the processing circuit 223 is coupled to the system processor 230. Depending on the design, in some embodiments, the touch driver integrated circuit 220, the touch interface circuit 221, the processing circuit 223, and / or the system processor 230 can be implemented as hardware circuits. In other embodiments, the touch driver integrated circuit 220, the touch interface circuit 221, the processing circuit 223, and / or the system processor 230 can be implemented as a combination of hardware, firmware, and software (i.e., programs).

[0046] In terms of hardware, the aforementioned touch driver integrated circuit 220, touch interface circuit 221, arithmetic circuit 223, and / or system processor 230 can be implemented on analog circuits and / or logic circuits on an integrated circuit. For example, the relevant functions of the touch driver integrated circuit 220, touch interface circuit 221, arithmetic circuit 223, and / or system processor 230 can be implemented in various logic blocks, modules, and circuits in one or more hardware controllers, microcontrollers, hardware processors, microprocessors, application-specific integrated circuits (ASICs), digital signal processors (DSPs), field-programmable gate arrays (FPGAs), central processing units (CPUs), and / or other processing units. The related functions of the touch driver integrated circuit 220, touch interface circuit 221, arithmetic circuit 223 and / or system processor 230 can be implemented as hardware circuits, such as various logic blocks, modules and circuits in an integrated circuit, using hardware description languages ​​(such as Verilog HDL or VHDL) or other suitable programming languages.

[0047] In a hybrid hardware and firmware form, the aforementioned touch driver integrated circuit 220, including touch interface circuit 221 and arithmetic circuit 223, and / or the related functions of system processor 230, can be implemented by including programming codes. For example, arithmetic circuit 223 and / or system processor 230 may include blocks implemented using general programming languages ​​(such as C, C++, or assembly language) or other suitable programming languages. The programming code can be recorded / stored in a non-transitory machine-readable storage medium. In some embodiments, the non-transitory machine-readable storage medium includes, for example, semiconductor memory and / or a storage device. Electronic devices (e.g., computers, CPUs, hardware controllers, microcontrollers, hardware processors, or microprocessors) can read and execute the programming code from the non-transitory machine-readable storage medium to realize the related functions of touch driver integrated circuit 220, touch interface circuit 221, arithmetic circuit 223, and / or system processor 230.

[0048] Figure 3 This is a flowchart illustrating an operation method of a touch driver integrated circuit 220 according to an embodiment of the present invention. Please refer to... Figure 2 and Figure 3 In step S310, the touch interface circuit 221 communicates with the active pen 120 via the touch panel 210. In response to the tip or end of the active pen 120 touching the touch panel 210, the processing circuit 223 determines the touch position of the active pen 120 (step S320). For example, based on multiple touch sensing data generated by the touch interface circuit 221, the processing circuit 223 determines the touch position of the active pen 120. The processing circuit 223 can transmit the touch position of the active pen 120 to the system processor 230 via a transmission interface (e.g., but not limited to I2C or SPI).

[0049] In some application examples, the active pen 120 can provide tilt angle information to the system processor 230 via the wireless communication interface 240. The system processor 230 can also receive tilt angle information of the touch panel 210 (touch device 110) sensed by the attitude sensor 250. Depending on the actual design and application, the attitude sensor 250 may include an inertial measurement unit (IMU) or other tilt measuring device. The system processor 230 can calculate the relative tilt angle between the tilt angle of the active pen 120 and the tilt angle of the touch panel 210, i.e., the stylus attitude information. Then, the processing circuit 223 can receive the relative tilt angle information from the system processor 230 through the same transmission interface used to report the touch position to the system processor 230. Alternatively, the system processor 230 may not generate relative tilt information itself, but instead transmit the tilt information of the active pen 120 and the tilt information of the touch panel 210 to the touch driver integrated circuit 220 through the same transmission interface used to report the touch position to the system processor 230. The touch driver integrated circuit 220 then calculates the relative tilt angle between the tilt angle of the active pen 120 and the tilt angle of the touch panel 210.

[0050] In other application examples, the tilt angle information of the active pen 120 can be carried by the active pen downlink signal, transmitted through the touch panel 210 to the touch driver integrated circuit 220, and received by the touch interface circuit 221. The arithmetic circuit 223 receives the tilt angle information of the active pen 120, and also receives the tilt angle information of the touch panel 210 from the system processor 230. Therefore, the arithmetic circuit 223 can calculate the relative tilt angle between the tilt angle of the active pen 120 and the tilt angle of the touch panel 210.

[0051] In step S330, based on the stylus posture information, including the relative tilt angle between the tilt angle of the active pen 120 and the tilt angle of the touch panel 210, the arithmetic circuit 223 determines whether to perform an erase operation or a writing operation with respect to the active pen 120.

[0052] For example, in response to the processing circuit 223 determining that the relative tilt angle is within a first range (this first range indicates that the active pen 120 is in a writing posture), the processing circuit 223 performs a writing operation, wherein the writing operation includes reporting the touch position of the active pen 120 and information indicating the writing operation to the system processor 230. The first range can be determined according to the actual design and application. For example, the first range can be between +300 degrees and +60 degrees (in this range, the tip of the active pen 120 is facing the touch panel 210, and the major axis direction of the active pen 120 is approximately parallel to the normal direction of the touch panel 210, at which time the relative tilt angle of the active pen 120 is defined as 0 degrees). On the other hand, in response to the processing circuit 223 determining that the relative tilt angle is not within the first range, the processing circuit 223 performs an erasing operation. When the processing circuit 223 performs the erasing operation, the touch interface circuit 221 receives a DC signal or a ground signal generated by the end of the active pen 120 through the touch panel 210.

[0053] In some application examples, the processing circuit 223 waits until the stylus 120 is stably maintained in the erasing posture before initiating the erasing operation. If the stylus 120 is not stably maintained in the erasing posture, the processing circuit 223 will not initiate the erasing operation. That is, in response to the processing circuit 223 determining that the relative tilt angle is not within a first range indicating that the stylus 120 is in a writing posture for one or more predefined number of times (this predefined number is determined according to the actual design and application) or for a predetermined time length, the processing circuit 223 performs the erasing operation, wherein the erasing operation includes reporting the touch position of the stylus 120 and information indicating the erasing operation to the system processor 230. In other application examples, the processing circuit 223 waits until it is fairly certain that the stylus 120 is stably maintained in the erasing posture before initiating the erasing operation. If the confidence in the stylus 120 being stably maintained in the erasing posture is not high, the processing circuit 223 will not initiate the erasing operation. For example, in response to the arithmetic circuit 223 determining that the relative tilt angle is not within a first range (i.e., not a writing posture) and is within a second range (this second range is intended to ensure that the active pen 120 is in an erasing posture) for one or more predefined number of times (this predefined number is determined according to the actual design and application) or for a predetermined time length, the arithmetic circuit 223 performs an erasing operation, wherein the first range and the second range do not overlap. The second range can be determined according to the actual design and application. For example, the second range can be between +120 degrees and +240 degrees.

[0054] Furthermore, when the arithmetic circuit 223 performs an erasing operation, it can also determine the angle between the active pen 120 (in the erasing posture) and the normal of the touch panel 210 based on the tilt angle information of the active pen 120 in the stylus posture information. The arithmetic circuit 223 reports the angle information between the active pen 120 (in the erasing posture) and the normal of the touch panel 210 to the system processor 230 to determine the erasing area of ​​the erasing operation. Based on the changes in stylus posture information (including the already calculated relative tilt angle, or separate active pen tilt angle information and touch panel tilt angle information), the system processor 230 can simulate the effect of using an eraser like the end of a regular pencil: the more tilted the pen, the larger the erasing area. That is, the smaller the angle between the active pen 120 and the normal of the touch panel 210, the smaller the erasure area (the area wiped by the eraser at the end of the pen) of the erasure operation; conversely, the larger the angle, the larger the erasure area (the area wiped by the eraser at the end of the pen) of the erasure operation.

[0055] Based on the stylus posture information containing the relative tilt angle, the processing circuit 223 can determine to execute the corresponding operation, such as an erasing operation, a writing operation, or other active pen operations. Therefore, the processing circuit 223 can automatically and accurately trigger the erasing mode for the active pen.

[0056] Figure 4 This is a circuit block diagram illustrating the touch interface circuit 221 and the arithmetic circuit 223 according to an embodiment of the present invention. Figure 4 In the illustrated embodiment, the touch interface circuit 221 includes an analog frontend circuit 411 and a digital backend circuit 412. The analog frontend circuit 411 transmits and receives analog sensing signals during active pen communication and converts them into digital touch sensing data for the digital backend circuit 412. The digital backend circuit 412 analyzes the touch sensing data to determine information such as signal strength and signal frequency. The digital backend circuit 412 can determine which sensing electrode received the downlink signal DL from the active pen 120, and then decodes the downlink signal DL to determine the command transmitted by the active pen 120.

[0057] exist Figure 4 In the illustrated embodiment, the computing circuit 223 includes firmware 421 and a microcontroller 422. The microcontroller 422 is coupled to the digital back-end circuit 412 to receive touch sensing data. The microcontroller 422 running firmware 421 can perform... Figure 2 The related functions of the arithmetic circuit 223 are shown. For example, based on the touch sensing data provided by the digital back-end circuit 412 (corresponding to the touch sensing data of all or part of the sensing electrodes on the touch panel 210), the microcontroller 422 running firmware 421 can calculate the touch position of the active pen 120.

[0058] Figure 5 This is a circuit block diagram of a touch device 510 according to another embodiment of the present invention. Figure 5 The touch device 510 shown can be used as Figure 1A and Figure 1B One of many embodiments of the touch device 110 shown. Figure 5 The touch device 510, stylus 120, uplink signal UL, downlink signal DL, and erase signal ER shown can be referenced. Figure 1A and Figure 1B The relevant explanations are omitted here. Figure 5 In the illustrated embodiment, the touch device 510 includes a touch display panel 515, a touch and display driver integration (TDDI) chip 520, a system processor 530, a wireless communication interface 540, and a posture sensor 550. Figure 5 The touch device 510, touch display panel 515, TDDI chip 520, system processor 530, wireless communication interface 540, and attitude sensor 550 shown can be referenced. Figure 2 The following descriptions and analogies are provided for the touch device 110, touch panel 210, touch driver integrated circuit 220, system processor 230, wireless communication interface 240, and attitude sensor 250 shown.

[0059] exist Figure 5 In the illustrated embodiment, the touch panel of the touch device 510 can be integrated into the touch display panel 515, and the TDDI chip 520 (touch driver integrated circuit) of the touch device 510 can include a touch interface circuit 521, a computing circuit 523, and a display driver circuit 525. Figure 5 The touch interface circuit 521 and the arithmetic circuit 523 shown can be referred to Figure 2 The related descriptions of the touch interface circuit 221 and the arithmetic circuit 223 shown are similar and will not be repeated here. The display driving circuit 525 is configured to drive the touch display panel 515 to display a plurality of image frames based on the touch position reported by the active pen 120, wherein the image frames display writing or erasing traces formed by the movement of the active pen 120.

[0060] In summary, the touch device uses the relative tilt angle between the stylus and the touch panel to help determine whether the stylus's erasing function has been activated. Based on this, the touch device can avoid misinterpreting erasing operations.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A touch driver integrated circuit for driving a touch panel, characterized in that, The touch driver integrated circuit includes: A touch interface circuit is configured to be coupled to the touch panel and configured to communicate with an active pen; and The computing circuit, coupled to the touch interface circuit, is configured to determine the touch position of the active pen in response to the pen tip or pen tail touching the touch panel, and to determine whether to perform an erasing or writing operation based on the pen posture information, wherein the pen posture information includes the relative tilt angle between the tilt angle of the active pen and the tilt angle of the touch panel.

2. The touch driver integrated circuit according to claim 1, characterized in that, Based on the multiple touch sensing data generated by the touch interface circuit, the computing circuit determines the touch position of the active pen.

3. The touch driver integrated circuit according to claim 1, characterized in that, In response to the computing circuit determining that the relative tilt angle is within a first range indicating that the active pen is in a writing posture, the computing circuit performs the writing operation, which includes reporting the touch position of the active pen and information indicating the writing operation to the system processor.

4. The touch driver integrated circuit according to claim 1, characterized in that, In response to determining that the relative tilt angle is not within a first range indicating that the active pen is in a writing posture for one or more predefined number of times, the arithmetic circuit performs the erasure operation, the erasure operation including reporting the touch position of the active pen to the system processor and information indicating the erasure operation.

5. The touch driver integrated circuit according to claim 1, characterized in that, In response to determining that the relative tilt angle is not within a first range indicating that the active pen is in a writing posture and is within a second range indicating that the active pen is in an erasing posture for one or more predefined number of times, the arithmetic circuit performs the erasing operation, the erasing operation including reporting the touch position of the active pen and information indicating the erasing operation to the system processor, wherein the first range and the second range do not overlap.

6. The touch driver integrated circuit according to claim 1, characterized in that, The touch panel is integrated into the touch display panel, and the touch driver integrated circuit also includes: The display driving circuit is formed as a touch and display driving integrated chip, wherein the display driving circuit is configured to drive the touch display panel to display multiple image frames based on the touch position reported by the active pen, and the multiple image frames display a writing trajectory or erasing trajectory formed by the display.

7. The touch driver integrated circuit according to claim 1, characterized in that, The writing operation is performed when the relative tilt angle is within a first range indicating that the active pen is in a writing posture, and the erasing operation is performed when the relative tilt angle is within a second range indicating that the active pen is in an erasing posture, and the first range and the second range do not overlap.

8. The touch driver integrated circuit according to claim 1, characterized in that, When the computing circuit performs the erasure operation, the touch interface circuit receives a DC signal or a ground signal from the touch panel.

9. The touch driver integrated circuit according to claim 1, characterized in that, The computing circuit receives the relative tilt angle information from the system processor.

10. The touch driver integrated circuit according to claim 1, characterized in that, The computing circuit receives information about the tilt angle of the active pen and the tilt angle of the touch panel from the system processor, and calculates the relative tilt angle.

11. The touch driver integrated circuit according to claim 10, characterized in that, The tilt angle information of the active pen is transmitted from the active pen to the system processor via a wireless communication interface.

12. The touch driver integrated circuit according to claim 1, characterized in that, The computing circuit receives information about the tilt angle of the active pen from the active pen and information about the tilt angle of the touch panel from the system processor, and then the computing circuit calculates the relative tilt angle.

13. The touch driver integrated circuit according to claim 1, characterized in that, Based on the tilt information included in the stylus posture information, the computing circuit determines the angle between the active stylus and the normal of the touch panel.

14. The touch driver integrated circuit according to claim 13, characterized in that, The computing circuit reports the angle information between the active pen and the normal of the touch panel to the system processor to determine the erasure area of ​​the erasure operation.

15. A method for operating a touch driver integrated circuit, wherein the touch driver integrated circuit is used to drive a touch panel, characterized in that, The operation method includes: The touch interface circuit of the touch driver integrated circuit communicates with the active pen, wherein the touch interface circuit is coupled to the touch panel; In response to the tip or tail of the active pen touching the touch panel, the computing circuit of the touch driver integrated circuit determines the touch position of the active pen, wherein the computing circuit is coupled to the touch interface circuit; and The decision to perform an erase or write operation is based on stylus posture information, wherein the stylus posture information includes the relative tilt angle between the tilt angle of the active pen and the tilt angle of the touch panel.

16. The operating method according to claim 15, characterized in that, The operation method further includes: Based on the multiple touch sensing data generated by the touch interface circuit, the computing circuit determines the touch position of the active pen.

17. The operating method according to claim 15, characterized in that, The operation method further includes: In response to the computing circuit determining that the relative tilt angle is within a first range indicating that the active pen is in a writing posture, the writing operation is performed, the writing operation including reporting the touch position of the active pen and information indicating the writing operation to the system processor.

18. The operating method according to claim 15, characterized in that, The operation method further includes: In response to determining that the relative tilt angle is not within a first range indicating that the active pen is in a writing posture for one or more predefined number of times, the erase operation is performed, the erase operation including reporting the touch position of the active pen to the system processor and information indicating the erase operation.

19. The operating method according to claim 15, characterized in that, The operation method further includes: In response to determining that the relative tilt angle is not within a first range indicating that the active pen is in a writing posture and within a second range indicating that the active pen is in an erasing posture for one or more predefined number of times, the erasing operation is performed, the erasing operation including reporting the touch position of the active pen and information indicating the erasing operation to the system processor, wherein the first range and the second range do not overlap.

20. The operating method according to claim 15, characterized in that, The touch panel is integrated into the touch display panel, and the touch driver integrated circuit further includes a display driver circuit to form a touch and display driver integrated chip. The display driver circuit is configured to drive the touch display panel to display multiple image frames based on the touch position reported by the active pen, and the multiple image frames display a writing trajectory or erasing trajectory.

21. The operating method according to claim 15, characterized in that, The writing operation is performed when the relative tilt angle is within a first range indicating that the active pen is in a writing posture, and the erasing operation is performed when the relative tilt angle is within a second range indicating that the active pen is in an erasing posture, and the first range and the second range do not overlap.

22. The operating method according to claim 15, characterized in that, The operation method further includes: When the computing circuit performs the erasure operation, the touch interface circuit receives a DC signal or a ground signal from the touch panel.

23. The operating method according to claim 15, characterized in that, The operation method further includes: The computing circuit receives the relative tilt angle information from the system processor.

24. The operating method according to claim 15, characterized in that, The operation method further includes: The computing circuit receives information about the tilt angle of the active pen and the tilt angle of the touch panel from the system processor; and The relative tilt angle is calculated by the aforementioned operational circuit.

25. The operating method according to claim 24, characterized in that, The operation method further includes: The tilt angle information of the active pen is transmitted from the active pen to the system processor via a wireless communication interface.

26. The operating method according to claim 15, characterized in that, The operation method further includes: The computing circuit receives information about the tilt angle of the active pen from the active pen. The computing circuit receives information about the tilt angle of the touch panel from the system processor; and The relative tilt angle is calculated by the aforementioned operational circuit.

27. The operating method according to claim 15, characterized in that, The operation method further includes: Based on the tilt information contained in the stylus posture information, the computing circuit determines the angle between the active stylus and the normal of the touch panel.

28. The operating method according to claim 27, characterized in that, The operation method further includes: The information about the angle between the active pen and the normal of the touch panel is reported to the system processor to determine the erasure area of ​​the erasure operation.

29. A touch device, characterized in that, The touch device includes: System processor; Touch panel; and A touch driver integrated circuit is coupled to the system processor and the touch panel, wherein the touch driver integrated circuit is configured to drive the touch panel, communicate with an active pen, and perform an erasing or writing operation based on stylus posture information, wherein the stylus posture information includes the relative tilt angle between the tilt angle of the active pen and the tilt angle of the touch panel.

30. The touch device according to claim 29, characterized in that, The touch driver integrated circuit includes: A touch interface circuit is configured to be coupled to the touch panel and configured to communicate with the active pen; and The computing circuit, coupled to the touch interface circuit, is configured to determine the touch position of the active pen in response to the pen tip or pen tail touching the touch panel, and to determine whether to perform the erase operation or the writing operation based on the pen posture information.

31. The touch device according to claim 30, characterized in that, Based on the multiple touch sensing data generated by the touch interface circuit, the computing circuit determines the touch position of the active pen.

32. The touch device according to claim 30, characterized in that, In response to the computing circuit determining that the relative tilt angle is within a first range indicating that the active pen is in a writing posture, the computing circuit performs the writing operation, which includes reporting the touch position of the active pen and information indicating the writing operation to the system processor.

33. The touch device according to claim 30, characterized in that, In response to determining that the relative tilt angle is not within a first range indicating that the active pen is in a writing posture for one or more predefined number of times, the arithmetic circuit performs the erasure operation, the erasure operation including reporting the touch position of the active pen and information indicating the erasure operation to the system processor.

34. The touch device according to claim 30, characterized in that, In response to determining that the relative tilt angle is not within a first range indicating that the active pen is in a writing posture and is within a second range indicating that the active pen is in an erasing posture for one or more predefined number of times, the arithmetic circuit performs the erasing operation, the erasing operation including reporting the touch position of the active pen and information indicating the erasing operation to the system processor, wherein the first range and the second range do not overlap.

35. The touch device according to claim 30, characterized in that, The touch panel is integrated into the touch display panel, and the touch driver integrated circuit also includes: The display driving circuit is formed as a touch and display driving integrated chip, wherein the display driving circuit is configured to drive the touch display panel to display multiple image frames based on the touch position reported by the active pen, and the multiple image frames display a writing trajectory or erasing trajectory formed therefrom.

36. The touch device according to claim 30, characterized in that, The writing operation is performed when the relative tilt angle is within a first range indicating that the active pen is in a writing posture, and the erasing operation is performed when the relative tilt angle is within a second range indicating that the active pen is in an erasing posture, and the first range and the second range do not overlap.

37. The touch device according to claim 30, characterized in that, When the computing circuit performs the erasure operation, the touch interface circuit receives a DC signal or a ground signal from the touch panel.

38. The touch device according to claim 30, characterized in that, The computing circuit receives the relative tilt angle information from the system processor.

39. The touch device according to claim 30, characterized in that, The computing circuit receives information about the tilt angle of the active pen and the tilt angle of the touch panel from the system processor, and calculates the relative tilt angle.

40. The touch device according to claim 39, characterized in that, The tilt angle information of the active pen is transmitted from the active pen to the system processor via a wireless communication interface.

41. The touch device according to claim 30, characterized in that, The computing circuit receives information about the tilt angle of the active pen from the active pen and information about the tilt angle of the touch panel from the system processor, and then the computing circuit calculates the relative tilt angle.

42. The touch device according to claim 30, characterized in that, Based on the tilt information included in the stylus posture information, the computing circuit determines the angle between the active stylus and the normal of the touch panel.

43. The touch device according to claim 42, characterized in that, The computing circuit reports the angle information between the active pen and the normal of the touch panel to the system processor to determine the erasure area of ​​the erasure operation.

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