TW201910988A - Touch apparatus and sensing method and touch sensing circuit thereof - Google Patents

Abstract

A touch apparatus and a sensing method and a touch sensing circuit thereof are provided. The touch apparatus includes a touch panel and the touch sensing circuit. In a first period, the touch sensing circuit applies the same driving signal to a plurality of sensing electrodes of the touch panel at the same time, and performs self-capacitance touch detection on the sensing electrodes to obtain a self-capacitance detection result. In a second period, the touch sensing circuit performs mutual-capacitance touch detection on at least one of the sensing electrodes to obtain a mutual-capacitance detection result. The touch sensing circuit determines whether the touch event of the touch panel is triggered by water based on the mutual-capacitance detection result and the self-capacitance detection result.

Description

Touch device, sensing method thereof and touch sensing circuit

The present invention relates to touch sensing, and more particularly to a touch device, a sensing method thereof, and a touch sensing circuit.

In an in-cell touch sensing application, a common electrode layer (VCOM layer) of the display panel is used as the touch sensing electrode. The common electrode layer is cut into a plurality of blocks (a plurality of sensing electrodes) to locate the position of the touch event. This common electrode layer needs to be coupled to a common voltage during display driving to ensure that the pixel liquid crystal can be operating at the correct voltage. During the touch sensing, the common electrode layer is coupled to the touch sensing circuit for touch sensing. In any case, in addition to the common electrode layer, the display panel also includes a data line (or source line) and a scan line (or gate line). Therefore, a parasitic capacitance is formed between the common electrode layer and the data line, and a parasitic capacitance is also formed between the common electrode layer and the scan line. When the common electrode layer performs touch sensing, these parasitic capacitances affect the capacitance value of the common electrode layer (sensing electrode). In order to reduce the influence of these parasitic capacitances on the touch sensing, during the touch sensing, except for the target sensing electrode (target common electrode), a driving signal is applied, and the data line and the scanning line are simultaneously applied with the same The drive signal is such as to eliminate parasitic capacitance between VCOM and the data line and parasitic capacitance between VCOM and the scan line.

In order to prevent accidental touch, when the touch sensing circuit detects a large-area touch event, the conventional touch sensing circuit usually ignores the large-area touch event, that is, the touch sensing circuit does not have a large area. The location of the touch event is reported back to the processor. In the actual touch use situation, it is often encountered that the wet finger touches the in-cell touch display panel. If the amount of water is a little more, the water from the wet finger will occupy a large area on the in-cell touch display panel. Conventional touch sensing circuits are unable to distinguish between large-area touch events caused by false touches and large-area touch events caused by wet fingers. A large-area touch event caused by a wet finger is usually a meaningful operation behavior of the user. However, the conventional touch sensing circuit usually regards the touch event caused by the wet finger as a false touch and ignores the wet finger touch. Control the incident.

The invention provides a touch device, a sensing method of the touch device and a touch sensing circuit of the touch device, which can determine whether the touch event is caused by water.

Embodiments of the present invention provide a touch device. The touch device includes a touch panel and a touch sensing circuit. The touch panel has a plurality of sensing electrodes for sensing a touch event. The touch sensing circuit is coupled to the touch panel to read sensing information of the sensing electrodes. During the first period, the touch sensing circuit simultaneously applies the same driving signal to the sensing electrodes, and the touch sensing circuit performs self-capacitance touch detection on the sensing electrodes to obtain Self-detection results. During the second period, the touch sensing circuit performs mutual-capacitor touch detection on at least one of the sensing electrodes to obtain a mutual capacitance detection result. The touch sensing circuit determines whether the touch event is caused by water according to the mutual capacitance detection result and the self-capacity detection result.

Embodiments of the present invention provide a sensing method of a touch device. The sensing method includes: providing a touch panel to sense a touch event; during the first period, the same driving signal is simultaneously applied to the plurality of sensing electrodes of the touch panel by the touch sensing circuit, and the sensing is performed The electrode performs self-capacitive touch detection to obtain a self-capacitance detection result; during the second period, the touch sensing circuit performs mutual capacitive touch detection on at least one of the sensing electrodes. The mutual sensing detection result is obtained; and the touch sensing circuit determines whether the touch event is caused by water according to the mutual capacitance detection result and the self-detection detection result.

Embodiments of the present invention provide a touch sensing circuit for reading sensing information of a plurality of sensing electrodes of a touch panel. During the first period, the touch sensing circuit applies the same driving signal to the sensing electrodes at the same time, and performs self-capacitive touch detection on the sensing electrodes to obtain a self-capacitance detection result. During the second period, the touch sensing circuit performs mutual capacitive touch detection on at least one of the sensing electrodes to obtain a mutual capacitance detection result. The touch sensing circuit determines whether the touch event of the touch panel is triggered by water according to the mutual capacitance detection result and the self-capacity detection result.

Based on the above, the sensing device of the touch device, the sensing method of the touch device, and the touch sensing circuit of the touch device can perform self-capacitive touch detection and mutual capacitance on the sensing electrodes. Touch detection. According to the mutual capacitance detection result and the self-capacity detection result, the touch sensing circuit can determine whether the touch event is caused by water. Therefore, the touch event caused by the wet finger is not misidentified as a large-area touch event caused by a false touch.

The above described features and advantages of the invention will be apparent from the following description.

The term "coupled (or connected)" as used throughout the specification (including the scope of the claims) may be used in any direct or indirect connection. For example, if the first device is described as being coupled (or connected) to the second device, it should be construed that the first device can be directly connected to the second device, or the first device can be A connection means is indirectly connected to the second device. In addition, wherever possible, the elements and/ Elements/components/steps that use the same reference numbers or use the same terms in different embodiments may refer to the related description.

FIG. 1 is a schematic diagram of a circuit block of a touch device 100 according to an embodiment of the invention. According to design requirements, the touch device 100 can be a mobile phone, a tablet computer, a notebook computer, or other portable electronic device. In other embodiments, the touch device 100 can be an advertising device, a vending machine, a bus information inquiry machine, or other fixed electronic devices. The touch device 100 includes a touch panel 110 , a touch sensing circuit 120 , and a processor 130 . The touch panel 110 has a plurality of sensing electrodes (such as the sensing electrodes 111 shown in FIG. 1). The touch panel 110 can sense a touch event. According to design requirements, the touch panel 110 can be any type of capacitive touch panel. For example, in some embodiments, the touch panel 110 can be an in-cell touch display panel, and the sensing electrodes in the touch panel 110 (such as the sensing electrodes shown in FIG. 1 ) 111) may be a plurality of common electrodes in the in-cell touch display panel. The common electrode is also referred to as a VCOM electrode.

The touch sensing circuit 120 is coupled to the touch panel 110 to read sensing information of the sensing electrodes in the touch panel 110 . According to design requirements, the touch sensing circuit 120 includes an analog front end (AFE) circuit, an analog digital conversion circuit, a digital operation circuit, and/or other circuits/components. The analog front end circuit can be a conventional analog front end circuit or other read circuit/component. The analog digital conversion circuit can be a conventional analog digital converter or other conversion circuit/component. The digital arithmetic circuit can be a microcontroller, a microprocessor or other processing circuit/component.

The processor 130 is coupled to the touch sensing circuit 120 to receive the processing result of the touch sensing circuit 120 (that is, the location information of the touch event). In some embodiments, the processor 130 may be a central processing unit (CPU) to run an operating system (OS). In other embodiments, the processor 130 may be a microcontroller, a microprocessor, an application-specific integrated circuit (ASIC), a digital signal processor (DSP), or a field programmable device. Field Programmable Gate Array (FPGA) and/or other processing circuits/components.

FIG. 2 is a schematic diagram showing a touch event of the touch panel 110 of FIG. 1 according to an embodiment of the invention. The touch sensing circuit 120 can simultaneously apply the same driving signal to the sensing electrodes (for example, the sensing electrodes 111 ) in the touch panel 110 , and the touch sensing circuit 120 can perform self-capacitive touch on the sensing electrodes. Self-capacitance touch detection. Therefore, when a large-area object 20 (for example, a palm) contacts the touch panel 110, the touch sensing circuit 120 can sense the large-area object via one or more sensing electrodes that are overlapped with the large-area object 20. 20. Since the contact area of the large-area object 20 on the touch panel 110 is greater than the threshold value, the touch sensing circuit 120 can ignore the touch event caused by the large-area object 20, that is, the touch sensing circuit 120 will not The location of the large area object 20 is reported back to the processor 130. Therefore, the touch sensing circuit 120 can prevent false touches.

FIG. 3 is another schematic diagram illustrating a touch event of the touch panel 110 of FIG. 1 according to an embodiment of the invention. In the actual touch usage scenario, the touch operation of the touch panel 110 by the wet finger 30 is often encountered. If the amount of water 31 is a little more, the water 31 brought by the wet finger 30 will occupy a large area on the touch panel 110, as shown in FIG. If the touch sensing circuit 120 cannot distinguish whether the object on the touch panel 110 is water 31, the touch sensing circuit 120 may regard the touch event caused by the wet finger 30 as a false touch and ignore the wet. Finger touch event. However, the large-area touch event caused by the wet finger 30 is usually a meaningful operational behavior of the user, rather than a false touch. Therefore, the touch sensing circuit 120 can perform the following sensing method to determine whether the touch event is caused by the water 31. When the touch sensing circuit 120 can distinguish that the touch event is caused by the water 31, the touch sensing circuit 120 can report the position of the water 31 (ie, the position of the wet finger 30) to the processor 130.

FIG. 4 is a schematic flow chart of a sensing method of the touch device 100 according to an embodiment of the invention. The sensing method shown in FIG. 4 includes step S410, step S420, step S430, and step S440. It should be noted that the order of these steps S410 to S440 shown in FIG. 4 is an exemplary embodiment, not the only way. For example, in other embodiments, the order of step S420 and step S430 shown in FIG. 4 may be reversed, that is, step S430 may be performed first, and then step S420 is performed.

Please refer to FIG. 1 and FIG. 4. Step S410 provides a touch panel 110 to sense a touch event. During the first period (step S420), the touch sensing circuit 120 can simultaneously apply the same driving signal to the sensing electrodes (for example, the sensing electrodes 111) in the touch panel 110, and self-capacitize the sensing electrodes. Touch detection to obtain self-detection results.

FIG. 5 is a schematic diagram showing a situation in which the touch panel 110 of FIG. 1 performs self-capacitive touch detection according to an embodiment of the invention. FIG. 5 is a schematic cross-sectional view of the touch panel 110. The touch panel 110 includes a sensing electrode 111_1, a sensing electrode 111_2, a sensing electrode 111_3, a sensing electrode 111_4, a sensing electrode 111_5, and a sensing electrode 111_6. The touch panel 110 has a cover layer 112 (such as a glass plate or other materials) for the user to actually touch. When the water 31 covers the touch panel 110, as shown in FIG. 5, a parasitic capacitance is formed between the water 31 and one or more sensing electrodes (for example, the sensing electrodes 111_2 to 111_5 shown in FIG. 5). In the case of self-capacitive touch detection, in addition to the target sensing electrode (such as the sensing electrode 111_4 shown in FIG. 5), a driving signal is applied, and the non-target sensing electrode (the sensing electrode that is not currently sensed) The same drive signal is also applied at the same time to reduce parasitic capacitance, as shown in Figure 5. According to the design requirements, the self-capacitive touch detection may be a conventional self-capacitive touch detection operation or other self-capacitive detection operations, and thus will not be described again.

However, in the case of self-capacitive touch detection, since the signals at both ends of the parasitic capacitance are the same waveform, the parasitic capacitance equivalent does not exist. According to the charge formula Q=C*V, when the voltage difference V across the parasitic capacitance is 0, the charge amount of the parasitic capacitance Q = C*0 = 0, that is, the capacitance value C of the parasitic capacitance is equivalent to 0. Therefore, in the scenario shown in FIG. 5, the touch sensing circuit 120 cannot determine that the water 31 is on the touch panel 110. That is, the self-detection detection result indicates that the touch panel 110 does not have a touch event.

Please refer to FIG. 1 and FIG. 4. During the second period (step S430), the touch sensing circuit 120 can perform mutual capacitive touch detection on at least one of the sensing electrodes of the touch panel 110 to obtain a mutual capacitance detection result. . In the mutual capacitive touch detection, the target sensing electrodes are coupled to the analog front end circuit of the touch sensing circuit 120, and the other sensing electrodes are applied with a driving signal.

FIG. 6 is a schematic diagram of a situation in which the touch panel 110 of FIG. 1 performs mutual capacitive touch detection according to an embodiment of the invention. The water 31, the touch panel 110, the sensing electrodes 111_1 - 111_6 and the cover layer 112 shown in FIG. 6 can be referred to the related description of FIG. 5, and therefore will not be described again. In the embodiment shown in FIG. 6, the touch sensing circuit 120 includes an analog front end circuit 121, an analog digital converter 122, and other circuits/elements. The output of the analog front end circuit 121 is coupled to the input of the analog digital converter 122. During the second period (step S430), the touch sensing circuit 120 can perform mutual capacitive touch detection on at least one of the sensing electrodes (eg, the sensing electrodes 111_4) of the sensing electrodes of the touch panel 110. Obtain the results of mutual capacitance detection. In the mutual-capacitive touch detection, the target sensing electrodes (eg, the sensing electrodes 111_4) are coupled to the analog front end circuit 121 of the touch sensing circuit 120, and the other sensing electrodes (eg, the sensing electrodes 111_1, 111_2, 111_3, 111_5 and 111_6) will be applied with a drive signal. According to the design requirements, the mutual-capacitive touch detection may be a conventional mutual-capacity touch detection operation or other mutual-capacity detection operation, and thus will not be described again. Therefore, the touch sensing circuit 120 can know that an object (water 31) is on the touch panel 110 during the second period (during the mutual capacitive touch detection).

In the embodiment shown in FIG. 6, the analog front end circuit 121 includes an operational amplifier 121_1 and a capacitor 121_2. The operational amplifier 121_1 has an inverting input terminal, a non-inverting input terminal, and an output terminal. The inverting input of the operational amplifier 121_1 is coupled to a target sensing electrode (eg, the sensing electrode 111_4). The first end and the second end of the capacitor 121_2 are respectively coupled to the inverting input end and the output end of the operational amplifier 121_1. An output of the operational amplifier 121_1 is coupled to an input of the analog-to-digital converter 122. The non-inverting input terminal of the operational amplifier 121_1 is coupled to the reference voltage V _ref . During the second period (during the mutual capacitive touch detection), the reference voltage V _ref is a fixed voltage, and the analog front end circuit 121 can perform mutual capacitive touch detection on the target sensing electrode (eg, the sensing electrode 111_4). . During the first period (during self-capacitive touch detection), the reference voltage V _{ref is a} clock signal, and the analog front end circuit 121 can perform self-capacitive touch detection on the target sensing electrode (eg, the sensing electrode 111_4). Measurement.

Please refer to FIG. 1 and FIG. 4. In step S440, the touch sensing circuit 120 can determine whether the touch event is triggered by the water 31 according to the mutual capacitance detection result of step S430 and the self-capacity detection result of step S420. For example, when the result of the mutual capacitance detection in step S430 indicates that the touch panel 110 has a touch event (refer to the description of FIG. 6), the self-capacity detection result of step S420 indicates that the touch panel 110 has no touch event. (Detailed description of FIG. 5), the touch sensing circuit 120 can determine that the touch event is caused by the water 31.

Once it is known that the large-area touch event of the touch panel 110 is caused by the water 31, the touch sensing circuit 120 can report the location of the large-area touch event to the processor 130. For example, when the touch sensing circuit 120 determines in step S440 that the touch event is triggered by the water 31, and during the user's contact with the water 31, the touch sensing circuit 120 can simultaneously apply the sensing electrodes. The same drive signal is applied, and the sensing electrodes are again subjected to self-capacitive touch detection to obtain the position of the water 31, and the position of the water 31 is reported to the processor 130. When the touch sensing circuit 120 determines that the touch event is not caused by water, the touch sensing circuit 120 can ignore the large-area touch event, that is, not return the position of the large-area touch event to the processor 130. .

FIG. 7 is a schematic diagram showing another scenario in which the touch panel 110 of FIG. 1 performs self-capacitive touch detection according to an embodiment of the invention. The water 31, the touch panel 110, the sensing electrodes 111_1 - 111_6 and the cover layer 112 shown in FIG. 7 can be referred to the related description of FIG. 5, and therefore will not be described again. In the scenario shown in FIG. 7, in addition to the water 31 contacting the touch panel 110, the wet finger 30 also contacts the touch panel 110. In the case of self-capacitive touch detection, in addition to the target sensing electrode (such as the sensing electrode 111_4 shown in FIG. 7), a driving signal is applied, and the non-target sensing electrode (the sensing electrode that is not currently sensed) The same drive signal is also applied at the same time to reduce the parasitic capacitance, as shown in FIG. The self-capacitive touch detection shown in FIG. 7 can refer to the related description of FIG. 5, and therefore will not be described again. The wet finger 30 can apply a reference voltage to the water 31. Therefore, in the scenario shown in FIG. 7, since the signals at both ends of the parasitic capacitance are different waveforms, the touch sensing circuit 120 can sense the parasitic capacitance and thereby sense the position of the water 31. Then, the touch sensing circuit 120 can report the position of the water 31 to the processor 130.

FIG. 8 is a block diagram showing the circuit of the touch sensing circuit 120 of FIG. 1 according to an embodiment of the invention. In the embodiment shown in FIG. 8 , the touch sensing circuit 120 includes an analog front end circuit 121 , an analog digital converter 122 , and a switching circuit 123 . The switch circuit 123 is coupled to the input end of the analog front end circuit 121. The switch circuit 123 is coupled to a plurality of peer electrodes belonging to the same row among the sensing electrodes of the touch panel 110, as shown in FIG. During the first period (during the self-capacitive touch detection), the switch circuit 123 alternately couples the peer electrodes to the input end of the analog front end circuit 121, so that the analog front end circuit 121 separates the peer electrodes in a time sharing manner. Perform self-capacitive touch detection. During the second period (during the mutual capacitive touch detection), the switch circuit 123 simultaneously couples the pair of electrodes to the input end of the analog front end circuit 121, so that the analog front end circuit 121 makes mutual contact with the peer electrodes. Control detection.

In the embodiment shown in FIG. 8, the analog front end circuit 121 includes an operational amplifier 121_1 and a capacitor 121_2. The operational amplifier 121_1 has an inverting input terminal, a non-inverting input terminal, and an output terminal. The inverting input terminal of the operational amplifier 121_1 is coupled to the switching circuit 123. The first end and the second end of the capacitor 121_2 are respectively coupled to the inverting input end and the output end of the operational amplifier 121_1. An output of the operational amplifier 121_1 is coupled to an input of the analog-to-digital converter 122. The non-inverting input terminal of the operational amplifier 121_1 is coupled to the reference voltage V _ref . During the second period (during the mutual capacitive touch detection), the reference voltage V _ref is a fixed voltage, and the analog front end circuit 121 can perform mutual capacitive touch detection on the target sensing electrode (eg, the sensing electrode 111_4). . During the first period (during self-capacitive touch detection), the reference voltage V _{ref is a} clock signal, and the analog front end circuit 121 can perform self-capacitive touch detection on the target sensing electrode (eg, the sensing electrode 111_4). Measurement.

The touch sensing circuit 120 can be coupled to the input end of the analog front end circuit 121 by the switch circuit 123. The touch sensing circuit 120 can obtain the mutual capacitance detection result of the touch panel 110 in a short time (for example, one cycle). In the embodiment shown in FIG. 8 , although the touch sensing circuit 120 cannot know the precise position of the touch event during the mutual capacitive touch detection, the touch sensing circuit 120 can be in a short time (for example, a cycle). The mutual touch detection method is used to know whether the touch panel 110 has a touch event, and whether the touch event is a large-area touch event caused by the water 31. Once it is confirmed that the large-area touch event is a touch event caused by the water 31, the touch sensing circuit 120 can perform self-capacitance touch on the sensing electrodes again during the user's contact with the water 31. The detection detects the position of the water 31 and reports the position of the water 31 to the processor 130. When the touch sensing circuit 120 determines that the large-area touch event of the touch panel 110 is not caused by water, the touch sensing circuit 120 can ignore the large-area touch event, that is, does not touch the large area. The location is returned to the processor 130.

It should be noted that in different application scenarios, the functions of the touch sensing circuit 120 and/or the processor 130 may utilize a general programming language (such as C or C++) or a hardware description language (hardware description). Languages, such as Verilog HDL or VHDL) or other suitable programming languages are implemented as software, firmware or hardware. The programming language that can perform the related functions can be arranged as any known computer-accessible media, such as magnetic tapes, semiconductors, magnetic disks, or optical disks. (compact disks, such as CD-ROM or DVD-ROM), or the programming language can be transmitted over the Internet, wired communication, wireless communication, or other communication medium. The programming language can be stored in an accessible medium of the computer such that the software (or firmware) programming codes are accessed/executed by the processor of the computer. For hardware implementation, one or more controllers, microcontrollers, microprocessors, special application integrated circuits (ASICs), digital signal processors (DSPs), field programmable logic gate arrays (FPGAs), and/or Various logic blocks, modules, and circuits in other processing units may be utilized to implement or perform the functions described in the embodiments herein. Additionally, the apparatus and method of the present invention can be implemented by a combination of hardware and software.

In summary, the touch device 100, the sensing method of the touch device 100, and the touch sensing circuit 120 of the touch device 100 can be used for the sensing electrodes of the touch panel 110. Self-capacitive touch detection and mutual-capacitive touch detection. Based on the mutual capacitance detection result and the self-capacity detection result, the touch sensing circuit 120 can determine whether the touch event of the touch panel 110 is caused by water. Therefore, the large-area touch event caused by the wet finger 30 is not misidentified as a large-area touch event caused by a false touch.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

20‧‧‧Large objects

30‧‧‧ Wet fingers

31‧‧‧ water

100‧‧‧ touch device

110‧‧‧Touch panel

111, 111_1, 111_2, 111_3, 111_4, 111_5, 111_6‧‧‧ sensing electrodes

112‧‧‧ Coverage

120‧‧‧Touch sensing circuit

121‧‧‧ analog front end circuit

121_1‧‧‧Operational Amplifier

121_2‧‧‧ capacitor

122‧‧‧ analog digital converter

123‧‧‧Switch circuit

130‧‧‧Processor

S410, S420, S430, S440‧‧ steps

V _ref ‧‧‧reference voltage

FIG. 1 is a schematic diagram of a circuit block of a touch device according to an embodiment of the invention. FIG. 2 is a schematic diagram showing a situation of a touch event of the touch panel shown in FIG. 1 according to an embodiment of the invention. FIG. 3 is a schematic diagram showing another scenario of a touch event of the touch panel shown in FIG. 1 according to an embodiment of the invention. FIG. 4 is a schematic flow chart of a sensing method of a touch device according to an embodiment of the invention. FIG. 5 is a schematic diagram showing a situation in which the touch panel of FIG. 1 performs self-capacitive touch detection according to an embodiment of the invention. FIG. 6 is a schematic diagram of a situation in which the touch panel of FIG. 1 performs mutual capacitive touch detection according to an embodiment of the invention. FIG. 7 is a schematic diagram showing another scenario in which the touch panel of FIG. 1 performs self-capacitive touch detection according to an embodiment of the invention. FIG. 8 is a block diagram showing the circuit of the touch sensing circuit of FIG. 1 according to an embodiment of the invention.

Claims (17)

A touch device includes: a touch panel having a plurality of sensing electrodes for sensing a touch event; and a touch sensing circuit coupled to the touch panel to read the sensing Sensing information of the electrodes, wherein in a first period, the touch sensing circuit simultaneously applies a same driving signal to the sensing electrodes, and the touch sensing circuit performs a self-contained sensing on the sensing electrodes The touch detection system obtains a self-capacitance detection result. In a second period, the touch sensing circuit performs a mutual capacitive touch detection on at least one of the sensing electrodes to obtain a The mutual capacitance detection result, and the touch sensing circuit determines whether the touch event is triggered by a water according to the mutual capacitance detection result and the self-detection detection result. The touch device of claim 1 , wherein the touch panel is an in-cell touch display panel, and the sensing electrodes are a plurality of common electrodes in the in-cell touch display panel. The touch device of claim 1, wherein the mutual capacitance detection result indicates that the touch panel generates the touch event, but the self-capacity detection result indicates that the touch panel does not touch the touch panel. In the event, the touch sensing circuit determines that the touch event is caused by the water. The touch device of claim 3, wherein when the touch sensing circuit determines that the touch event is caused by the water, the touch sense is during a period in which the user contacts the water The measuring circuit simultaneously applies the same driving signal to the sensing electrodes, and performs the self-capacitive touch detection on the sensing electrodes to obtain the position of the water, and returns the position of the water to a processor. The touch device of claim 1, wherein the touch sensing circuit comprises: an analog front end circuit; and a switch circuit coupled to an input end of the analog front end circuit and coupled to the a plurality of peer electrodes belonging to a same row of the sensing electrodes, wherein during the first period, the switching circuit alternately couples the plurality of peer electrodes to the input end of the analog front end circuit to make the analog front end circuit pair The self-capacitive touch detection is performed in a time sharing manner, and during the second period, the switch circuit simultaneously couples the pair of peer electrodes to the input end of the analog front end circuit to make the analogy The front end circuit performs the mutual capacitive touch detection on the pair of peer electrodes. The touch device of claim 5, wherein the analog front end circuit comprises: an operational amplifier having an inverting input terminal, a non-inverting input terminal, and an output terminal, wherein the inverting input terminal is coupled The non-inverting input terminal is coupled to a reference voltage; and a capacitor has a first end and a second end coupled to the inverting input terminal and the output end of the operational amplifier, respectively. The touch device of claim 6, wherein the reference voltage is a clock signal during the first period, and the reference voltage is a fixed voltage during the second period. A sensing method of a touch device includes: providing a touch panel to sense a touch event; and applying a plurality of sensing electrodes of the touch panel simultaneously by a touch sensing circuit during a first period a same driving signal, and performing a self-capacitive touch detection on the sensing electrodes to obtain a self-detecting detection result; in the second period, the sensing electrodes are used by the touch sensing circuit The at least one sensing electrode performs a mutual capacitive touch detection to obtain a mutual capacitance detection result; and the touch sensing circuit determines the mutual capacitance detection result and the self-capacity detection result Whether the touch event is triggered by a water. The sensing method of the eighth aspect of the invention, wherein the touch panel is an in-cell touch display panel, and the sensing electrodes are a plurality of common electrodes in the in-cell touch display panel. The sensing method of claim 8, wherein the mutual capacitance detection result indicates that the touch panel generates the touch event, but the self-capacity detection result indicates that the touch panel does not have the touch In the event, the touch sensing circuit determines that the touch event is caused by the water. The sensing method of claim 10, wherein the touch sensing circuit determines that the touch event is caused by the water, and during a period in which the user contacts the water, the touch The sensing circuit simultaneously applies the same driving signal to the sensing electrodes, and performs the self-capacitive touch detection on the sensing electrodes to obtain the position of the water, and returns the position of the water to a processor. . A touch sensing circuit is configured to read sensing information of a plurality of sensing electrodes of a touch panel, wherein: during a first period, the touch sensing circuit simultaneously applies the same to the sensing electrodes Driving a signal, and performing a self-capacitive touch detection on the sensing electrodes to obtain a self-detecting detection result. In a second period, the touch sensing circuit is at least one of the sensing electrodes A sensing electrode performs a mutual capacitive touch detection to obtain a mutual capacitance detection result, and the touch sensing circuit determines the touch panel according to the mutual capacitance detection result and the self-capacity detection result. Whether a touch event is triggered by a water. The touch sensing circuit of claim 12, wherein the mutual capacitance detection result indicates that the touch panel generates the touch event, but the self-capacity detection result indicates that the touch panel does not occur. When the touch event occurs, the touch sensing circuit determines that the touch event is caused by the water. The touch sensing circuit of claim 13, wherein the touch sensing circuit determines that the touch event is caused by the water, and during a period in which the user contacts the water, The touch sensing circuit simultaneously applies the same driving signal to the sensing electrodes, and performs the self-capacitive touch detection on the sensing electrodes to obtain the position of the water and report the position of the water to A processor. The touch sensing circuit of claim 12, comprising: an analog front end circuit; and a switch circuit coupled to an input end of the analog front end circuit and coupled to the sensing electrodes a plurality of peer electrodes belonging to a same row, wherein during the first period, the switch circuit alternately couples the plurality of peer electrodes to the input end of the analog front end circuit, so that the analog front end circuit The self-capacitive touch detection is performed in a time sharing manner, and during the second period, the switch circuit simultaneously couples the pair of peer electrodes to the input end of the analog front end circuit, so that the analog front end circuit is The mutual electrode performs the mutual capacitive touch detection. The touch sensing circuit of claim 15, wherein the analog front end circuit comprises: an operational amplifier having an inverting input terminal, a non-inverting input terminal, and an output terminal, wherein the inverting input The non-inverting input terminal is coupled to a reference voltage, and the capacitor has a first end and a second end coupled to the inverting input terminal and the output end of the operational amplifier . The touch sensing circuit of claim 16, wherein the reference voltage is a clock signal during the first period, and the reference voltage is a fixed voltage during the second period.