Touch detection device and method, chip, display device, and electronic device

Abstract

The present disclosure relates to a touch detection device and method, a chip, a display device and an electronic device. The touch detection device includes a charge amplifying circuit connected to a sensing point of a touch panel, for receiving an excitation signal and a charge of the sensing point, amplifying the charge of the sensing point, and outputting a capacitance change signal of the sensing point, and a capacitance compensation circuit connected to the sensing point of the touch panel, for injecting a compensation charge, the polarity of which is related to the change direction of the level of the excitation signal, into the sensing point while the level of the excitation signal changes. In the embodiment of the present disclosure, the influence of the parasitic capacitance of the touch panel can be compensated for and thus eliminated, so as to improve the accuracy of touch detection and save the circuit area.

Description

Technical Field

[0001] The present disclosure relates to the technical field of touch, and in particular, to a touch detection device and method, a chip, a display device, and an electronic device.

Background Art

[0002] Touch screens have already been widely applied to many electronic products, and their sensing methods include electromagnetic, capacitive, ultrasonic, etc. Among them, the most common sensing method is capacitive. Also, in order to save the occupied area of the circuit, currently, the control circuits of many touch screens integrate a display driving circuit and a capacitive touch sensing circuit into a TDDI (touch and display driver integration) chip.

[0003] However, in the TDDI chip, since a touch sensing circuit and a display driving circuit are integrated, the area of the chip becomes large. In addition, when the touch sensing circuit adopts a self-capacitance detection method, it is necessary to provide a compensation capacitor inside to cancel the parasitic capacitance of the touch screen, further increasing the area of the TDDI chip.

Summary of the Invention

[0004] In view of this, the present disclosure provides a touch detection device, a charge amplification circuit connected to a sensing point of a touch panel, receiving an excitation signal and the charge of the sensing point, amplifying the charge of the sensing point, and outputting a capacitance change signal of the sensing point; a capacitance compensation circuit connected to a sensing point of a touch panel, and injecting a compensation charge whose polarity is associated with the change direction of the level of the excitation signal into the sensing point while the level of the excitation signal changes.

[0005] In a possible embodiment, when the excitation signal changes from a low level to a high level, the polarity of the compensation charge is positive, or when the excitation signal changes from a high level to a low level, the polarity of the compensation charge is negative.

[0006] In a possible embodiment, the capacitance compensation circuit When the excitation signal changes from a first level to a second level higher than the first level, initializes the voltage of the sensing point to the first level, and gradually injects positive charge into the sensing point, or When the excitation signal changes from the second level to the first level, it is used to initialize the voltage of the sensing point to the second level and gradually inject negative charge into the sensing point.

[0007] In a possible embodiment, the capacitance compensation circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a compensation capacitor, and a first operational amplifier. The first ends of the first switch, the second switch, and the fourth switch are all connected to the first end of the compensation capacitor, and the first ends of the first switch, the third switch, and the fifth switch are all connected to the second end of the compensation capacitor. The second ends of the first switch and the second switch are grounded, and the second ends of the first switch and the third switch are connected to the power supply voltage. The second end of the fifth switch is connected to the sensing point and the first end of the sixth switch. The positive input terminal of the first operational amplifier is connected to the second end of the sixth switch, and the negative input terminal, the output terminal of the first operational amplifier, and the second end of the fourth switch are connected to each other.

[0008] In a possible embodiment, the charge amplification circuit includes a seventh switch, an eighth switch, a ninth switch, a tenth switch, an integrating capacitor, and a second operational amplifier. The first end of the tenth switch is connected to the sensing point, and the second end of the tenth switch is connected to the first end of the eighth switch, the first end of the ninth switch, and the negative input end of the second operational amplifier. The second end of the eighth switch is connected to the first end of the integration capacitor, and the first end of the seventh switch is connected to the second end of the integration capacitor. The positive input end of the second operational amplifier is used to receive the excitation signal. The output end of the second operational amplifier is connected to the second ends of the seventh switch and the ninth switch, and is used to output the capacitance change signal.

[0009] In a possible embodiment, in a first time period when the excitation signal changes from a first level to a second level higher than the first level, the tenth switch and the ninth switch are turned on, the voltage of the sensing point is initialized to the first level, and the second switch, the third switch, and the sixth switch are turned on, and the zeroeth switch, the first switch, the fourth switch, the fifth switch, the seventh switch, and the eighth switch are turned off. In a second time period when the excitation signal changes from the first level to the second level, the seventh switch and the eighth switch are turned on, the ninth switch is turned off, and the second switch, the third switch, the fourth switch, and the fifth switch are cyclically switched according to a first switch mode and a second switch mode. In the first switch mode, the second switch and the third switch are turned off, and the fourth switch and the fifth switch are turned on. In the second switch mode, the second switch and the third switch are turned on, and the fourth switch and the fifth switch are turned off.

[0010] In a possible embodiment, in a first time period when the excitation signal changes from a second level higher than the first level to the first level, the tenth switch and the ninth switch are turned on, the voltage at the sensing point is initialized to the second level, and the zeroeth switch, the first switch, and the sixth switch are turned on, and the second switch, the third switch, the fourth switch, the fifth switch, the seventh switch, and the eighth switch are turned off. In a second time period when the excitation signal changes from the second level to the first level, the seventh switch and the eighth switch are turned on, the ninth switch is turned off, and the zeroeth switch, the first switch, the fourth switch, and the fifth switch are cyclically switched according to a third switch mode and a fourth switch mode. In the third switch mode, the zeroeth switch and the first switch are turned off, and the fourth switch and the fifth switch are turned on. In the fourth switch mode, the zeroeth switch and the first switch are turned on, and the fourth switch and the fifth switch are turned off.

[0011] According to one aspect of the present disclosure, a touch detection method includes: receiving an excitation signal and the charge at a sensing point in a touch panel, amplifying the charge at the sensing point, and outputting a capacitance change signal of the sensing point; injecting a compensation charge, the polarity of which is associated with the change direction of the level of the excitation signal, into the sensing point while the level of the excitation signal changes.

[0012] In a possible embodiment, in the touch detection method, when the excitation signal changes from a low level to a high level, the polarity of the compensation charge is positive, or when the excitation signal changes from a high level to a low level, the polarity of the compensation charge is negative.

[0013] In one possible embodiment, when the excitation signal changes from the first level to a second level higher than the first level, the voltage of the sensing point is initialized to the first level, and positive charges are gradually injected into the sensing point, or when the excitation signal changes from the second level to the first level, the voltage of the sensing point is initialized to the second level, and negative charges are gradually injected into the sensing point.

[0014] According to one aspect of the present disclosure, a chip including the touch detection device is provided.

[0015] According to one aspect of the present disclosure, a display device including a plurality of display units and the chip is provided.

[0016] In one possible embodiment, the display unit includes a display panel, and the display panel includes any one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electro-wetting display panel, and a narrow pitch display panel.

[0017] According to one aspect of the present disclosure, an electronic device including the display device is provided.

[0018] According to another aspect of the present disclosure, there is provided a touch detection device, a processor, a memory for storing instructions executable by the processor, and includes when the processor executes the instructions stored in the memory, a touch detection device configured to implement the touch detection method is provided.

[0019] According to another aspect of the present disclosure, there is provided a non-volatile computer-readable storage medium storing computer program instructions that, when executed by a processor, implement the touch detection method.

[0020] According to another aspect of the present disclosure, there is provided a computer program product including computer-readable code or a non-volatile computer-readable storage medium carrying the computer-readable code, wherein when the computer-readable code is executed by a processor of an electronic device, the processor in the electronic device executes the touch detection method.

[0021] In an embodiment of the present disclosure, a charge amplification circuit receives an excitation signal and the charge at the sensing point, amplifies the charge at the sensing point, and outputs a capacitance change signal of the sensing point. A capacitance compensation circuit injects a compensation charge into the sensing point while the level of the excitation signal changes, and is provided such that the polarity of the compensation charge is associated with the change direction of the level of the excitation signal, thereby compensating and then removing the influence of the parasitic capacitance of the touch panel, improving the accuracy of touch detection, and saving circuit area.

[0022] Other features and aspects of the present disclosure will become apparent by describing exemplary embodiments in detail with reference to the accompanying drawings.

Brief Description of the Drawings

[0023] The accompanying drawings, which are included in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the present disclosure and are used to explain the principles of the present disclosure together with the specification.

Figure 1

Figure 2

Figure 3

Figure 4

DETAILED DESCRIPTION OF THE INVENTION

[0024] Various exemplary embodiments, features, and aspects according to the present disclosure will be described in detail below with reference to the drawings. In the drawings, the same reference numerals indicate elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0025] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for facilitating the description of the present disclosure and simplifying the description, and does not indicate or imply that the device or element shown thereby must have a specific orientation and must be configured and operated in a specific orientation. Therefore, it should not be understood as limiting the present disclosure.

[0026] It should be noted that the terms "first" and "second" are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Thus, the features limited by "first" and "second" may include one or more of the corresponding features explicitly or implicitly. In the description of the present disclosure, "a plurality" means two or more unless otherwise specifically limited.

[0027] In this disclosure, unless there are specific and clear regulations and limitations, terms such as "attach", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral one. It may be a mechanical connection or an electrical connection. It may be directly connected, indirectly connected through an intermediate medium, or an internal communication between two elements or an interaction relationship between two elements. A person skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific situation.

[0028] In this specification, the term "and / or" is only used to describe the relationship of related objects and indicates that three relationships are possible. For example, A and / or B can indicate three cases: only A exists, A and B exist simultaneously, and only B exists. Also, in this specification, the term "at least one" indicates any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C can indicate including any one or more elements selected from the set consisting of A, B, and C.

[0029] Referring to FIG. 1, FIG. 1 shows a schematic diagram of a touch detection device according to an embodiment of the present disclosure.

[0030] As shown in FIG. 1, the touch detection device includes a charge amplification circuit 110 connected to the sensing point X of the touch panel, receiving the excitation signal VSTIM and the charge of the sensing point X, amplifying the charge of the sensing point X, and outputting a capacitance change signal Vo of the sensing point X; a capacitance compensation circuit 120 connected to the sensing point X of the touch panel, injecting a compensation charge whose polarity is associated with the change direction of the level of the excitation signal VSTIM into the sensing point X while the level of the excitation signal VSTIM changes.

[0031] In an embodiment of the present disclosure, the charge amplification circuit 110 receives the excitation signal VSTIM and the charge at the sensing point X, amplifies the charge at the sensing point X, outputs the capacitance change signal Vo of the sensing point X, and the capacitance compensation circuit 120 injects compensation charge into the sensing point X while the level of the excitation signal VSTIM changes, and is provided such that the polarity of the compensation charge is associated with the change direction of the level of the excitation signal VSTIM, thereby compensating and even removing the influence of the parasitic capacitance of the touch panel, improving the accuracy rate of touch detection, and saving the circuit area.

[0032] In an embodiment of the present disclosure, the specific implementation manners of the charge amplification circuit 110 and the capacitance compensation circuit 120 are not limited. A person skilled in the art can adopt an appropriate technical solution to implement according to the actual situation and requirements. As long as the charge amplification circuit 110 can receive the excitation signal VSTIM and the charge at the sensing point X, amplify the charge at the sensing point X, and output the capacitance change signal Vo of the sensing point X, and as long as the capacitance compensation circuit 120 can inject compensation charge into the sensing point X while the level of the excitation signal VSTIM changes.

[0033] In an embodiment of the present disclosure, the type of the touch panel is not limited. Exemplarily, the touch panel may be a self-capacitance type touch panel. Correspondingly, the sensing point X may be one end of the equivalent capacitance Csense corresponding to the self-capacitance unit of the touch panel, and the self-capacitance unit may include at least one self-capacitance.

[0034] In an embodiment of the present disclosure, the form of the excitation signal VSTIM is not limited. A person skilled in the art can select according to the actual situation and requirements. For example, the excitation signal VSTIM may be a signal that changes between a high level and a low level, such as a periodic quasi-square wave signal (e.g., a trapezoidal wave).

[0035] In a possible embodiment, when the excitation signal VSTIM changes from a low level to a high level, the polarity of the compensation charge is positive, or when the excitation signal VSTIM changes from a high level to a low level, the polarity of the compensation charge is negative. Thus, when the excitation signal VSTIM changes from a low level to a high level, in the embodiments of the present disclosure, a positive charge can be injected into the sensing point X, and when the excitation signal VSTIM changes from a high level to a low level, in the embodiments of the present disclosure, a negative charge can be injected into the sensing point X. Thereby, the influence of the parasitic capacitance is reduced and even removed, and the accuracy rate of touch detection is improved. Of course, when the excitation signal VSTIM changes from a high level to a low level, in the embodiments of the present disclosure, it can also be considered that the influence of the parasitic capacitance is reduced and even removed by transferring the positive charge at the sensing point X to the charge compensation circuit by transferring the positive charge at the sensing point X.

[0036] In a possible embodiment, the capacitance compensation circuit 120 is used to initialize the voltage of the sensing point X to the first level and gradually inject a positive charge into the sensing point X when the excitation signal VSTIM changes from the first level to a second level higher than the first level, or used to initialize the voltage of the sensing point X to the second level and gradually inject a negative charge into the sensing point X when the excitation signal VSTIM changes from the second level to the first level.

[0037] For example, the first level is a low level (0), and the second level is a high level (1). When the excitation signal VSTIM rises from the low level to the high level, in an embodiment of the present disclosure, first, the voltage of the sensing point X is initialized to the low level, and then, a positive charge is gradually injected into the sensing point X to perform charge compensation. When the excitation signal VSTIM drops from the high level to the low level, in an embodiment of the present disclosure, first, the voltage of the sensing point X is initialized to the second level, and then, a negative charge is gradually injected into the sensing point X to perform charge compensation. In this way, in an embodiment of the present disclosure, the influence caused by the parasitic capacitance of the touch panel can be compensated and then removed, the accuracy rate of touch detection can be improved, and the circuit area can be saved.

[0038] Of course, in an embodiment of the present disclosure, the specific manner of realizing "initializing the voltage of the sensing point X to the first level and gradually injecting a positive charge into the sensing point X" and "initializing the voltage of the sensing point X to the second level and gradually injecting a negative charge into the sensing point X" is not limited. A person skilled in the art can select and perform an appropriate manner according to the actual situation and requirements. Hereinafter, possible implementation manners will be exemplarily introduced.

[0039] Referring to FIG. 2, FIG. 2 shows a schematic diagram of a touch detection device according to an embodiment of the present disclosure.

[0040] In a possible embodiment, as shown in FIG. 2, the capacitance compensation circuit 120 may include a first switch S0, a second switch S1, a third switch S2, a fourth switch S3, a fifth switch S4, a sixth switch S5, a seventh switch S6, a compensation capacitor Ccomp, and a first operational amplifier AMP1.

[0041] Here, the first ends of the 0th switch S0, the 2nd switch S2, and the 4th switch S4 are all connected to the first end of the compensation capacitor Ccomp, and the first ends of the 1st switch S1, the 3rd switch S3, and the 5th switch S5 are all connected to the second end of the compensation capacitor Ccomp. The second ends of the 1st switch S1 and the 2nd switch S2 are grounded, and the second ends of the 0th switch S0 and the 3rd switch S3 are connected to the power supply voltage VSP. The second end of the 5th switch S5 is connected to the sensing point X and the first end of the 6th switch S6. The positive input end of the first operational amplifier AMP1 is connected to the second end of the 6th switch S6, and the negative input end, the output end of the first operational amplifier AMP1, and the second end of the 4th switch S4 are connected to each other.

[0042] In a possible embodiment, as shown in FIG. 2, the charge amplification circuit 110 may include a 7th switch S7, an 8th switch S8, a 9th switch S9, a 10th switch S10, an integration capacitor Cfb, and a second operational amplifier AMP2.

[0043] Here, the first end of the 10th switch S10 is connected to the sensing point X, and the second end of the 10th switch S10 is connected to the first end of the 8th switch S8, the first end of the 9th switch S9, and the negative input end of the second operational amplifier AMP2. The second end of the 8th switch S8 is connected to the first end of the integration capacitor Cfb, and the first end of the 7th switch S7 is connected to the second end of the integration capacitor Cfb. The positive input end of the second operational amplifier AMP2 is used to receive the excitation signal VSTIM. The output end of the second operational amplifier AMP2 is connected to the second ends of the 7th switch S7 and the 9th switch S9, and is used to output the capacitance change signal Vo.

[0044] In a possible embodiment, as shown in FIG. 2, in a first time period in which the excitation signal VSTIM changes from a first level (low level 0) to a second level (high level 1) higher than the first level, the tenth switch S10 and the ninth switch S9 are turned on, the voltage at the sensing point X is initialized to the first level, and the second switch S2, the third switch S3, and the sixth switch S6 are turned on, and the zeroeth switch S0, the first switch S1, the fourth switch S4, the fifth switch S5, the seventh switch S7, and the eighth switch S8 are turned off. In a second time period in which the excitation signal VSTIM changes from the first level to the second level, the seventh switch S7 and the eighth switch S8 are turned on, the ninth switch S9 is turned off, and the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5 are cyclically switched according to a first switch mode and a second switch mode. In the first switch mode, the second switch S2 and the third switch S3 are turned off, and the fourth switch S4 and the fifth switch S5 are turned on. In the second switch mode, the second switch S2 and the third switch S3 are turned on, and the fourth switch S4 and the fifth switch S5 are turned off.

[0045] Exemplarily, in the first switch mode, by turning off the second switch S2 and the third switch S3 and turning on the fourth switch S4 and the fifth switch S5, a positive charge is supplied to the sensing point X through the second terminal of the compensation capacitor Ccomp.

[0046] Exemplarily, in the second switch mode, by turning on the second switch S2 and the third switch S3 and turning off the fourth switch S4 and the fifth switch S5, the second terminal of the compensation capacitor Ccomp is charged using the power supply voltage VSP. At this time, the second terminal of the compensation capacitor Ccomp is charged with a positive charge, and the first terminal is charged with a negative charge.

[0047] In an embodiment of the present disclosure, the number of cycles of the first switching mode and the second switching mode in the second time period when the excitation signal VSTIM changes from the first level to the second level is not limited. Those skilled in the art can set it according to the actual situation and requirements. It should be understood that the larger the number of cycles, the larger the amount of compensation charge.

[0048] By cyclically performing the first switching mode and the second switching mode, in an embodiment of the present disclosure, charge transfer can be cyclically performed to inject positive charge in the compensation capacitor Ccomp into the sensing point X, compensate for the influence of the parasitic capacitance, and improve the accuracy of the touch signal.

[0049] In a possible embodiment, as shown in FIG. 2, in the first time period when the excitation signal VSTIM changes from a second level higher than the first level to the first level, the tenth switch S10 and the ninth switch S9 are turned on, the voltage of the sensing point X is initialized to the second level, and the zeroeth switch S0, the first switch S1, and the sixth switch S6 are turned on, and the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the seventh switch S7, and the eighth switch S8 are turned off. In the second time period when the excitation signal VSTIM changes from the second level to the first level, the seventh switch S7 and the eighth switch S8 are turned on, the ninth switch S9 is turned off, and the zeroeth switch S0, the first switch S1, the fourth switch S4, and the fifth switch S5 are cyclically switched according to the third switching mode and the fourth switching mode. In the third switching mode, the zeroeth switch S0 and the first switch S1 are turned off, and the fourth switch S4 and the fifth switch S5 are turned on. In the fourth switching mode, the zeroeth switch S0 and the first switch S1 are turned on, and the fourth switch S4 and the fifth switch S5 are turned off.

[0050] Exemplarily, in the third switch mode, the first switch S0 and the second switch S1 are turned off, and the fourth switch S4 and the fifth switch S5 are turned on, so as to supply a negative charge to the sensing point X through the second terminal of the compensation capacitor Ccomp, or transfer the positive charge of the sensing point X to the second terminal of the compensation capacitor Ccomp.

[0051] Exemplarily, in the fourth switch mode, the first switch S0 and the second switch S1 are turned on, and the fourth switch S4 and the fifth switch S5 are turned off, so as to charge the first terminal of the compensation capacitor Ccomp using the power supply voltage VSP. At this time, the second terminal of the compensation capacitor Ccomp is charged with a negative charge, and the first terminal is charged with a positive charge.

[0052] In the embodiments of the present disclosure, the number of cycles of the third switch mode and the fourth switch mode in the second time period when the excitation signal VSTIM changes from the second level to the first level is not limited. Those skilled in the art can set it according to the actual situation and requirements. It should be understood that the larger the number of cycles, the larger the amount of compensation charge.

[0053] By cyclically performing the third switch mode and the fourth switch mode, in the embodiments of the present disclosure, charge transfer can be cyclically performed so as to inject the negative charge in the compensation capacitor Ccomp into the sensing point X (or transfer the positive charge of the sensing point X to the second terminal of the compensation capacitor Ccomp), compensate for the influence of the parasitic capacitance, and improve the accuracy of the touch signal.

[0054] In an embodiment of the present disclosure, while the excitation signal VSTIM changes periodically, a charge is injected into the sensing point X by one compensation capacitor Ccomp to compensate for the influence of the parasitic capacitance of the sensing point X, thereby improving the accuracy of touch detection. Further, in an embodiment of the present disclosure, only at least one compensation capacitor Ccomp can achieve capacitance compensation for the entire cycle. Compared with the technical solution using a complex compensation capacitor Ccomp in the related art, the embodiment of the present disclosure can significantly reduce the complexity of the circuit, reduce the circuit area, and save costs.

[0055] In an embodiment of the present disclosure, in order for a subsequent module to determine whether a touch has occurred, a charge amplification circuit 110 outputs a capacitance change signal Vo. For example, in an embodiment of the present disclosure, it may further include a touch determination component that receives the capacitance change signal Vo and uses the capacitance change signal Vo to determine whether a touch has occurred. Exemplarily, the touch determination component may use the capacitance change signal Vo while the excitation signal VSTIM rises from a low level to a high level to determine whether a touch has occurred, or use the capacitance change signal Vo while the excitation signal VSTIM falls from a high level to a low level to determine whether a touch has occurred. Also, the capacitance change signal Vo while the excitation signal VSTIM rises from the low level to the high level is used as a first output voltage signal, and the capacitance change signal Vo while the excitation signal VSTIM falls from the high level to the low level is used as a second output voltage signal, and it may be determined whether a touch has occurred based on the difference signal between the first output voltage signal and the second output voltage signal. In an embodiment of the present disclosure, the specific implementation method for determining whether a touch has occurred is not limited. A person skilled in the art can adopt an appropriate technical solution to implement it according to the actual situation and requirements.

[0056] Referring to FIG. 3, FIG. 3 shows a flowchart of a touch detection method according to an embodiment of the present disclosure.

[0057] As shown in FIG. 3, the touch detection method includes Receiving the excitation signal VSTIM and the charge of the sensing point X on the touch panel, amplifying the charge of the sensing point X, and outputting a capacitance change signal Vo of the sensing point X in step S11; Including step S12 of injecting a compensation charge whose polarity is associated with the change direction of the level of the excitation signal VSTIM into the sensing point X while the level of the excitation signal VSTIM changes.

[0058] In an embodiment of the present disclosure, by receiving the excitation signal VSTIM and the charge of the sensing point X, amplifying the charge of the sensing point X, outputting a capacitance change signal Vo of the sensing point X, and injecting a compensation charge into the sensing point X while the level of the excitation signal VSTIM changes, and providing the compensation charge so that its polarity is associated with the change direction of the level of the excitation signal VSTIM, the influence caused by the parasitic capacitance of the touch panel can be compensated and then removed, the accuracy rate of touch detection can be improved, and the circuit area can be saved.

[0059] In a possible embodiment, the touch detection method is When the excitation signal VSTIM changes from a low level to a high level, the polarity of the compensation charge is positive, or when the excitation signal VSTIM changes from a high level to a low level, the polarity of the compensation charge is negative.

[0060] In a possible embodiment, the touch detection method is When the excitation signal VSTIM changes from a first level to a second level higher than the first level, initializing the voltage of the sensing point X to the first level, and gradually injecting a positive charge into the sensing point X, or When the excitation signal VSTIM changes from the second level to the first level, initializing the voltage of the sensing point X to the second level, and gradually injecting a negative charge into the sensing point X.

[0061] The touch detection method according to an embodiment of the present disclosure may be implemented by a processing component. Exemplarily, the processing component includes, but is not limited to, an individual processor, or discrete components, or a combination of a processor and discrete components. The processor may include a controller having a function of executing instructions in an electronic device. The processor may be implemented in any suitable manner. For example, it may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components. In the processor, the executable instructions can be executed by hardware circuits such as logic gates, switches, application specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers.

[0062] It should be noted that the touch detection method corresponds to the touch detection device, and for a specific description thereof, reference may be made to the description of the above-mentioned device, and details are not described herein again.

[0063] According to one aspect of the present disclosure, a chip including the touch detection device is provided.

[0064] According to one aspect of the present disclosure, a display device including a plurality of display units and the chip is provided.

[0065] In a possible embodiment, the display unit includes a display panel, and the display panel includes any one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electro-wetting display panel, and a narrow pitch display panel.

[0066] According to one aspect of the present disclosure, an electronic device including the display device is provided.

[0067] Exemplarily, the electronic device in this embodiment includes, but is not limited to, a desktop personal computer, a television, a mobile device having a large screen, such as a mobile phone, a tablet personal computer, and other general electronic devices that can drive a plurality of chips in a cascade connection.

[0068] Exemplarily, the electronic device may be a user equipment (UE), a mobile device, a user terminal, a terminal, a handheld device, a computing device, or an in-vehicle device, etc. Exemplarily, as examples of some terminals, there may be a display, a smartphone or a mobile device, a mobile phone, a tablet, a notebook computer, a palmtop, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a wireless terminal in the internet of vehicles (IOV) of an automobile, etc. For example, the server may be a local server or a cloud server.

[0069] Referring to FIG. 4, FIG. 4 shows a block diagram of an electronic device according to an embodiment of the present disclosure.

[0070] For example, the electronic device 1900 may be provided as a server or a terminal device. Referring to FIG. 4, the electronic device 1900 includes a processing component 1922 including one or more processors and a memory resource represented by a memory 1932 for storing instructions executable by the processing component 1922, such as application programs. The application programs stored in the memory 1932 may each include one or more modules corresponding to one instruction group. It should be noted that the processing component 1922 is configured to execute the above method by executing instructions.

[0071] The electronic device 1900 may further include a power component 1926 configured to perform power management of the electronic device 1900, a wired or wireless network interface 1950 configured to connect the electronic device 1900 to a network, and an input / output (I / O) interface 1958. The electronic device 1900 can operate based on an operating system stored in the memory 1932, such as Windows Server®, Mac OS XTM, Unix®, Linux®, FreeBSDTM, or the like.

[0072] In an exemplary embodiment, there is further provided a non-volatile computer-readable storage medium, such as the memory 1932 including computer program instructions, and the computer program instructions can be executed by the processing component 1922 of the electronic device 1900 to implement the above method.

[0073] The above content is merely an exemplary embodiment of the present invention and does not limit the technical scope of the present invention. The technical scope of the present invention is determined by the appended claims.

[0074] As used herein, the term "exemplary" means "used as an example, an embodiment, or illustrative." It should not be construed that any embodiment described as "exemplary" is necessarily preferred or superior to other embodiments.

[0075] It should be noted that, in this specification, the terms "include" and "have" or any variation thereof are intended to cover non-exclusive inclusion. A process, method, article, or device that includes a series of elements includes not only these elements but also other elements not explicitly listed, or further includes elements specific to these processes, methods, articles, or devices. Without more limitations, the elements limited by the phrase "comprising one..." do not exclude the existence of other same elements in the process, method, article, or device comprising the said elements.

[0076] Flowcharts and block diagrams in the drawings illustrate the system architecture, functions, and operations of possible implementations of systems, methods, and computer program products according to multiple embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram can represent one module, program segment, or part of an instruction, and said module, program segment, or part of an instruction includes one or more executable instructions for implementing a specified logical function. In some alternative embodiments, the functions represented by the blocks may be implemented in a different order than that shown in the attached drawings. For example, two consecutive blocks may be executed substantially in parallel, or may sometimes be executed in the reverse order depending on such functions. It should be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, may be implemented by a dedicated system of hardware for executing the specified functions or operations, or may also be implemented by a combination of dedicated hardware and computer instructions.

[0077] Although each embodiment of the present disclosure has been described above, the above description is merely exemplary, not exhaustive, and not limited to each disclosed embodiment. For those skilled in the art, various modifications and changes are obvious without departing from the scope and spirit of the described embodiments. The terms chosen in this specification are for the purpose of preferably interpreting the principles of each embodiment, actual applications, or improvements to technologies in the market, or for enabling other skilled persons to understand each embodiment disclosed in this text. [Configuration 1] A touch detection device, A charge amplification circuit connected to a sensing point of a touch panel, receiving an excitation signal and the charge of the sensing point, amplifying the charge of the sensing point, and outputting a capacitance change signal of the sensing point; A touch detection device, characterized in that it includes a capacitance compensation circuit connected to a sensing point of a touch panel, and injecting a compensation charge whose polarity is associated with the change direction of the level of the excitation signal into the sensing point while the level of the excitation signal changes. [Configuration 2] The touch detection device according to Configuration 1, characterized in that when the excitation signal changes from a low level to a high level, the polarity of the compensation charge is positive, or when the excitation signal changes from a high level to a low level, the polarity of the compensation charge is negative. [Configuration 3] The capacitance compensation circuit is When the excitation signal changes from a first level to a second level higher than the first level, initializing the voltage of the sensing point to the first level, and gradually injecting a positive charge into the sensing point, or The touch detection device according to Configuration 1, characterized in that it is used to initialize the voltage of the sensing point to the second level and gradually inject a negative charge into the sensing point when the excitation signal changes from the second level to the first level. [Configuration 4] The capacitance compensation circuit includes a 0th switch, a 1st switch, a 2nd switch, a 3rd switch, a 4th switch, a 5th switch, a 6th switch, a compensation capacitor, and a 1st operational amplifier. The first ends of the 0th switch, the 2nd switch, and the 4th switch are all connected to the first end of the compensation capacitor, and the first ends of the 1st switch, the 3rd switch, and the 5th switch are all connected to the second end of the compensation capacitor. The second ends of the 1st switch and the 2nd switch are grounded, and the second ends of the 0th switch and the 3rd switch are connected to a power supply voltage. The second end of the 5th switch is connected to the sensing point and the first end of the 6th switch. The positive input terminal of the 1st operational amplifier is connected to the second end of the 6th switch. The touch detection device according to any one of Configurations 1 to 3, characterized in that the negative input terminal of the first operational amplifier, the output terminal of the first operational amplifier, and the second terminal of the fourth switch are connected to each other. [Configuration 5] The charge amplification circuit includes a seventh switch, an eighth switch, a ninth switch, a tenth switch, an integrating capacitor, and a second operational amplifier. The first terminal of the tenth switch is connected to the sensing point, and the second terminal of the tenth switch is connected to the first terminal of the eighth switch, the first terminal of the ninth switch, and the negative input terminal of the second operational amplifier. The second terminal of the eighth switch is connected to the first terminal of the integrating capacitor, and the first terminal of the seventh switch is connected to the second terminal of the integrating capacitor. The positive input terminal of the second operational amplifier is used to receive the excitation signal. The touch detection device according to Configuration 4, characterized in that the output terminal of the second operational amplifier is connected to the second terminals of the seventh switch and the ninth switch and is used to output the capacitance change signal. [Configuration 6] In a first time period in which the excitation signal changes from a first level to a second level higher than the first level, the tenth switch and the ninth switch are turned on, the voltage of the sensing point is initialized to the first level, and the second switch, the third switch, and the sixth switch are turned on, and the zero switch, the first switch, the fourth switch, the fifth switch, the seventh switch, and the eighth switch are turned off. In a second time period in which the excitation signal changes from the first level to the second level, the seventh switch and the eighth switch are turned on, the ninth switch is turned off, and the second switch, the third switch, the fourth switch, and the fifth switch are cyclically switched according to a first switch mode and a second switch mode. In the first switch mode, the second switch and the third switch are turned off, and the fourth switch and the fifth switch are turned on. The touch detection device according to Configuration 5, characterized in that in the second switch mode, the second switch and the third switch are turned on, and the fourth switch and the fifth switch are turned off. [Configuration 7] In a first time period in which the excitation signal changes from a second level higher than the first level to the first level, the tenth switch and the ninth switch are turned on, the voltage at the sensing point is initialized to the second level, and the zeroeth switch, the first switch, and the sixth switch are turned on, while the second switch, the third switch, the fourth switch, the fifth switch, the seventh switch, and the eighth switch are turned off. In a second time period in which the excitation signal changes from the second level to the first level, the seventh switch and the eighth switch are turned on, the ninth switch is turned off, and the zeroeth switch, the first switch, the fourth switch, and the fifth switch are cyclically switched according to a third switch mode and a fourth switch mode. In the third switch mode, the zeroeth switch and the first switch are turned off, and the fourth switch and the fifth switch are turned on. The touch detection device according to Configuration 5, wherein in the fourth switch mode, the zeroeth switch and the first switch are turned on, and the fourth switch and the fifth switch are turned off. [Configuration 8] A touch detection method, comprising: receiving an excitation signal and charges at a sensing point in a touch panel, amplifying the charges at the sensing point, and outputting a capacitance change signal of the sensing point; injecting a compensation charge, whose polarity is associated with a change direction of the level of the excitation signal, into the sensing point while the level of the excitation signal changes. [Configuration 9] The touch detection method according to Configuration 8, wherein when the excitation signal changes from a low level to a high level, the polarity of the compensation charge is positive, or when the excitation signal changes from a high level to a low level, the polarity of the compensation charge is negative. [Configuration 10] When the excitation signal changes from the first level to a second level higher than the first level, initializing the voltage at the sensing point to the first level and gradually injecting a positive charge into the sensing point, or When the excitation signal changes from the second level to the first level, initializing the voltage at the sensing point to the second level and gradually injecting a negative charge into the sensing point. [Configuration 11] A chip comprising the touch detection device according to any one of Configurations 1 to 7. [Configuration 12] A display device comprising a plurality of display units and the chip according to Configuration 11. [Configuration 13] The display unit includes a display panel, and the display panel includes any one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electro-wetting display panel, and a narrow pitch display panel. The display device according to Configuration 12 is characterized by this. [Configuration 14] An electronic device including the display device according to Configuration 12 or 13.

Claims

1. A touch detection device, comprising: a charge amplification circuit connected to a sensing point of a touch panel, receiving an excitation signal and the charge of the sensing point, amplifying the charge of the sensing point, and outputting a capacitance change signal of the sensing point; a capacitance compensation circuit connected to a sensing point of a touch panel, and injecting a compensation charge whose polarity is associated with a change direction of the level of the excitation signal into the sensing point while the level of the excitation signal changes; the capacitance compensation circuit includes a 0th switch, a 1st switch, a 2nd switch, a 3rd switch, a 4th switch, a 5th switch, a 6th switch, a compensation capacitor, and a 1st operational amplifier; a first end of the 0th switch, a first end of the 2nd switch, and a first end of the 4th switch are all connected to a first end of the compensation capacitor, and a first end of the 1st switch, a first end of the 3rd switch, and a first end of the 5th switch are all connected to a second end of the compensation capacitor; a second end of the 1st switch and the 2nd switch is grounded, and a second end of the 0th switch and the 3rd switch is connected to a power supply voltage; a second end of the 5th switch is connected to the sensing point and a first end of the 6th switch; a plus input terminal of the 1st operational amplifier is connected to a second end of the 6th switch; a touch detection device, characterized in that a minus input terminal of the 1st operational amplifier, an output terminal of the 1st operational amplifier, and a second end of the 4th switch are connected to each other.

2. The touch detection device according to claim 1, characterized in that when the excitation signal changes from a low level to a high level, the polarity of the compensation charge is positive, or when the excitation signal changes from a high level to a low level, the polarity of the compensation charge is negative.

3. The capacitance compensation circuit is used for: when the excitation signal changes from a first level to a second level higher than the first level, initializing the voltage of the sensing point to the first level, and gradually injecting positive charge into the sensing point; or when the excitation signal changes from the second level to the first level, initializing the voltage of the sensing point to the second level, and gradually injecting negative charge into the sensing point.

4. The charge amplification circuit includes a seventh switch, an eighth switch, a ninth switch, a tenth switch, an integration capacitor, and a second operational amplifier. A first end of the tenth switch is connected to the sensing point, and a second end of the tenth switch is connected to a first end of the eighth switch, a first end of the ninth switch, and a minus input end of the second operational amplifier. A second end of the eighth switch is connected to a first end of the integration capacitor, and a first end of the seventh switch is connected to a second end of the integration capacitor. The plus input end of the second operational amplifier is used to receive the excitation signal. The touch detection device according to claim 1, wherein an output end of the second operational amplifier is connected to a second end of the seventh switch and a second end of the ninth switch, and is used to output the capacitance change signal.

5. In a first time period when the excitation signal changes from a first level to a second level higher than the first level, the tenth switch and the ninth switch are turned on, the voltage of the sensing point is initialized to the first level, and the second switch, the third switch, and the sixth switch are turned on, and the zero switch, the first switch, the fourth switch, the fifth switch, the seventh switch, and the eighth switch are turned off. In a second time period when the excitation signal changes from the first level to the second level, the seventh switch and the eighth switch are turned on, the ninth switch is turned off, and the second switch, the third switch, the fourth switch, and the fifth switch are cyclically switched according to a first switch mode and a second switch mode. In the first switch mode, the second switch and the third switch are turned off, and the fourth switch and the fifth switch are turned on. The touch detection device according to claim 4, wherein in the second switch mode, the second switch and the third switch are turned on, and the fourth switch and the fifth switch are turned off.

6. In a first time period in which the excitation signal changes from a second level higher than the first level to the first level, the tenth switch and the ninth switch are turned on, the voltage at the sensing point is initialized to the second level, and the zeroeth switch, the first switch, and the sixth switch are turned on, while the second switch, the third switch, the fourth switch, the fifth switch, the seventh switch, and the eighth switch are turned off. In a second time period in which the excitation signal changes from the second level to the first level, the seventh switch and the eighth switch are turned on, the ninth switch is turned off, and the zeroeth switch, the first switch, the fourth switch, and the fifth switch are cyclically switched according to a third switch mode and a fourth switch mode. In the third switch mode, the zeroeth switch and the first switch are turned off, and the fourth switch and the fifth switch are turned on. The touch detection device according to claim 4, wherein in the fourth switch mode, the zeroeth switch and the first switch are turned on, and the fourth switch and the fifth switch are turned off. **Claim 7**: A touch detection method by a touch detection device, comprising: a step in which a charge amplification circuit receives an excitation signal and the charge at a sensing point in a touch panel, amplifies the charge at the sensing point, and outputs a capacitance change signal at the sensing point; a step in which a capacitance compensation circuit injects a compensation charge whose polarity is associated with the change direction of the level of the excitation signal into the sensing point while the level of the excitation signal changes. The capacitance compensation circuit includes a zeroeth switch, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a compensation capacitor, and a first operational amplifier. The first ends of the zeroeth switch, the second switch, and the fourth switch are all connected to the first end of the compensation capacitor, and the first ends of the first switch, the third switch, and the fifth switch are all connected to the second end of the compensation capacitor. The second ends of the first switch and the second switch are grounded, and the second ends of the zeroeth switch and the third switch are connected to a power supply voltage. The second end of the fifth switch is connected to the sensing point and the first end of the sixth switch. The positive input terminal of the first operational amplifier is connected to the second terminal of the sixth switch. A touch detection method, characterized in that the negative input terminal of the first operational amplifier, the output terminal of the first operational amplifier, and the second terminal of the fourth switch are connected to each other. **Claim 8** The touch detection method according to claim 7, characterized in that when the excitation signal changes from a low level to a high level, the polarity of the compensation charge is positive, or when the excitation signal changes from a high level to a low level, the polarity of the compensation charge is negative. **Claim 9** When the excitation signal changes from a first level to a second level higher than the first level, the voltage of the sensing point is initialized to the first level, and positive charges are gradually injected into the sensing point, or The touch detection method according to claim 7, characterized in that when the excitation signal changes from the second level to the first level, the voltage of the sensing point is initialized to the second level, and negative charges are gradually injected into the sensing point. **Claim 10** A chip, characterized in that it includes the touch detection device according to claim 1. **Claim 11** A display device, characterized in that it includes a plurality of display units and the chip according to claim 10. **Claim 12** The display unit includes a display panel, and the display panel includes any one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electro-wetting display panel, and a narrow pitch display panel. The display device according to claim 11 is characterized by this. **Claim 13** An electronic device including the display device according to claim 11 or 12.

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