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 technology]

[0002] Touch screens have been widely applied in many electronic products, and their sensing methods include electromagnetic, capacitive, and ultrasonic, among which the most common sensing method is capacitive. In addition, in order to save circuit area, most of the current touch screen control circuits integrate the display driving circuit and the capacitive touch sensing circuit into a TDDI (touch and display driver integration) chip.

[0003] However, the TDDI chip has a large chip area because it integrates a touch sensing circuit and a display driver circuit. In addition, if the touch sensing circuit adopts a self-capacitance detection method, a compensation capacitor needs to be installed inside to offset the parasitic capacitance of the touch screen, which further increases the area of ​​the TDDI chip. Summary of the Invention

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

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

[0006] In one possible embodiment, the capacitance compensation circuit comprises: Initializing a voltage at the sensing point to the first level and gradually injecting a positive charge at the sensing point when the excitation signal changes from a first level to a second level higher than the first level; or It is used to initialize the voltage of the sensing point to the second level and gradually inject negative charges into the sensing point when the excitation signal changes from the second level to the first level.

[0007] In one possible embodiment, the capacitance compensation circuit includes a zeroth 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; a first end of the 0th switch, a first end of the second switch, and a first end of the fourth switch are all connected to a first end of the compensation capacitor, and a first end of the first switch, a first end of the third switch, and a first end of the fifth switch are all connected to a second end of the compensation capacitor; a second end of the first switch and a second end of the second switch are grounded, and a second end of the zero switch and a second end of the third switch are connected to a power supply voltage; a second terminal of the fifth switch is connected to the sensing point and a first terminal of the sixth switch; The positive input terminal of the first operational amplifier is connected to the second terminal of the sixth switch, and 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.

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

[0009] In one possible embodiment, during 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 zeroth switch, the first switch, the fourth switch, the fifth switch, the seventh switch and the eighth switch are turned off; During a second time period in which the excitation signal changes from a first level to a 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 a 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 one possible embodiment, during 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 of the sensing point is initialized to the second level, and the zeroth 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; During a second time period in which the excitation signal changes from a second level to a first level, the seventh switch and the eighth switch are turned on, the ninth switch is turned off, and the zeroth 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 a third switch mode, the 0 switch and the 1st switch are turned off, and the 4th switch and the 5th switch are turned on; In the fourth switch mode, the 0th switch and the 1st switch are turned on, and the 4th switch and the 5th switch are turned off.

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

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

[0013] In one possible embodiment, when the excitation signal changes from a first level to a second level higher than the first level, the voltage at the sensing point is initialized to the first level, and a positive charge is gradually injected at the sensing point, or When the excitation signal changes from a second level to a 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, there is provided a chip including the touch sensing device.

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

[0016] In one possible embodiment, the display unit includes a display panel, which 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 electrowetting display panel, and a narrow pitch display panel.

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

[0018] According to another aspect of the present disclosure, there is provided a touch detection device, comprising: A processor; a memory for storing instructions executable by a processor; The processor, when executing instructions stored in the memory, provides a touch detection apparatus configured to implement the touch detection method.

[0019] According to another aspect of the present disclosure, there is provided a non-volatile computer readable storage medium having stored thereon 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 having computer readable code carried thereon, the computer readable code being executed by a processor of an electronic device, causing a processor in the electronic device to perform the touch detection method.

[0021] In the embodiment of the present disclosure, a charge amplification circuit receives an excitation signal and a charge at the sensing point, amplifies the charge at the sensing point, and outputs a capacitance change signal at the sensing point; a capacitance compensation circuit injects a compensation charge into the sensing point while the level of the excitation signal changes, and the polarity of the compensation charge is associated with the change direction of the level of the excitation signal, thereby compensating for and even eliminating 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 from the following detailed description of illustrative embodiments which proceeds with reference to the accompanying drawings. [Brief description of the drawings]

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features and aspects of the present disclosure and, together with the specification, serve to explain the principles of the present disclosure. [Figure 1] 1 shows a schematic diagram of a touch detection device according to an embodiment of the present disclosure. [Diagram 2] 1 shows a schematic diagram of a touch detection device according to an embodiment of the present disclosure. [Diagram 3] 1 shows a flowchart of a touch detection method according to an embodiment of the present disclosure. [Figure 4]FIG. 1 shows a block diagram of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Various exemplary embodiments, features, and aspects according to the present disclosure are described in detail below with reference to the drawings, in which like reference numerals indicate functionally identical or similar elements, and in which various aspects of the embodiments are illustrated, but which are not necessarily drawn to scale unless otherwise indicated.

[0025] In describing the present disclosure, it should be understood that orientations or positional relationships indicated by terms such as "length," "width," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, are based on the orientations or positional relationships shown in the drawings, and are merely for ease and simplification of explanation of the present disclosure, and do not indicate or imply that the devices or elements depicted thereby must necessarily have a particular orientation, be configured and operate in a particular orientation, and should not be understood as limiting the present disclosure.

[0026] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply a relative importance or number of technical features represented therein. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this disclosure, "plurality" means two or more, unless otherwise specifically limited.

[0027] In the present disclosure, unless otherwise clearly specified and limited, the terms "attached", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or it may be integral. It may be a mechanical connection or an electrical connection. It may be a direct connection, an indirect connection through an intermediate medium, an internal communication between two elements, or an interactive relationship between two elements. A person skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific situation.

[0028] In this specification, the term "and / or" is merely used to describe the related relationship of related objects, and indicates that three relationships can exist. For example, A and / or B can indicate three cases: only A exists, A and B exist simultaneously, and only B exists. In addition, 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 amplifier circuit 110 connected to a sensing point X of the touch panel, for receiving an excitation signal VSTIM and a charge at the sensing point X, amplifying the charge at the sensing point X, and outputting a capacitance change signal Vo at the sensing point X; a capacitance compensation circuit 120 connected to a sensing point X of the touch panel for injecting a compensation charge, the polarity of which is associated with a direction of change in the level of the excitation signal VSTIM, into the sensing point X while the level of the excitation signal VSTIM is changing.

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

[0032] In the embodiments of the present disclosure, there is no limitation on the specific implementation manner of the charge amplifier circuit 110 and the capacitance compensation circuit 120. Those skilled in the art can adopt appropriate technical solutions to realize them according to the actual situation and needs, and the charge amplifier circuit 110 only needs to 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 at the sensing point X, and the capacitance compensation circuit 120 only needs to inject a compensation charge into the sensing point X while the level of the excitation signal VSTIM changes.

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

[0034] In the embodiment of the present disclosure, the form of the excitation signal VSTIM is not limited, and those skilled in the art can select it according to the actual situation and needs, 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 one 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, the embodiment of the present disclosure can inject a positive charge into the sensing point X, and when the excitation signal VSTIM changes from a high level to a low level, the embodiment of the present disclosure can inject a negative charge into the sensing point X. This reduces or even eliminates the effect of parasitic capacitance, improving the accuracy of touch detection. Of course, when the excitation signal VSTIM changes from a high level to a low level, the embodiment of the present disclosure can also be considered as reducing or even eliminating the effect of parasitic capacitance by charge transfer of the positive charge of the sensing point X to transfer the positive charge of the sensing point X to a charge compensation circuit.

[0036] In one possible embodiment, the capacitance compensation circuit 120 comprises: 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 positive charges into the sensing point X; or It is used to initialize the voltage of the sensing point X to the second level and gradually inject negative charges 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 a low level to a high level, in the embodiment of the present disclosure, the voltage of the sensing point X is first initialized to a low level, and then a positive charge is gradually injected into the sensing point X to perform charge compensation. When the excitation signal VSTIM falls from a high level to a low level, in the embodiment of the present disclosure, the voltage of the sensing point X is first 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 the embodiment of the present disclosure, the influence of the parasitic capacitance of the touch panel can be compensated for and even eliminated, the accuracy of touch detection can be improved, and the circuit area can be saved.

[0038] Of course, the embodiments of the present disclosure do not limit the specific manner of realizing "initializing the voltage of the sensing point X to the first level and gradually injecting positive charges into the sensing point X" and "initializing the voltage of the sensing point X to the second level and gradually injecting negative charges into the sensing point X". Those skilled in the art can select an appropriate manner according to the actual situation and needs. Possible implementation manners are exemplarily introduced below.

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

[0041] Here, a first terminal of the 0th switch S0, a first terminal of the second switch S2, and a first terminal of the fourth switch S4 are all connected to a first terminal of the compensation capacitor Ccomp, and a first terminal of the first switch S1, a first terminal of the third switch S3, and a first terminal of the fifth switch S5 are all connected to a second terminal of the compensation capacitor Ccomp; A second terminal of the first switch S1 and a second terminal of the second switch S2 are grounded, and a second terminal of the zero switch S0 and a second terminal of the third switch S3 are connected to a power supply voltage VSP. A second terminal of the fifth switch S5 is connected to the sensing point X and a first terminal of the sixth switch S6. The positive input terminal of the first operational amplifier AMP1 is connected to the second terminal of the sixth switch S6, and the negative input terminal of the first operational amplifier AMP1, the output terminal of the first operational amplifier AMP1, and the second terminal of the fourth switch S4 are connected to each other.

[0042] In one possible embodiment, as shown in FIG. 2, the charge amplifier circuit 110 may include a seventh switch S7, an eighth switch S8, a ninth switch S9, a tenth switch S10, an integration capacitor Cfb, and a second operational amplifier AMP2.

[0043] Here, a first terminal of the tenth switch S10 is connected to the sensing point X, and a second terminal of the tenth switch S10 is connected to a first terminal of the eighth switch S8, a first terminal of the ninth switch S9, and a negative input terminal of the second operational amplifier AMP2, A second terminal of the eighth switch S8 is connected to a first terminal of the integration capacitor Cfb, and a first terminal of the seventh switch S7 is connected to a second terminal of the integration capacitor Cfb; The positive input terminal of the second operational amplifier AMP2 is used to receive the excitation signal VSTIM; The output terminal of the second operational amplifier AMP2 is connected to the second terminal of the seventh switch S7 and the second terminal of the ninth switch S9, and is used to output the capacitance change signal Vo.

[0044] In one possible embodiment, as shown in FIG. 2, during 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 of 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 zeroth 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 a first level to a 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, 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 to supply a positive charge to the sensing point X through the second end of the compensation capacitor Ccomp.

[0046] Exemplarily, 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, so that the second end of the compensation capacitor Ccomp is charged using the power supply voltage VSP, and at this time, the second end of the compensation capacitor Ccomp is positively charged and the first end is negatively charged.

[0047] In the embodiment of the present disclosure, the number of cycles of the first switch mode and the second switch mode during 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 needs, and it should be understood that the more the number of cycles, the larger the amount of compensation charge.

[0048] By cyclically performing the first switch mode and the second switch mode, in the embodiment of the present disclosure, charge transfer can be cyclically performed to inject positive charges in the compensation capacitor Ccomp to the sensing point X, thereby compensating for the influence of parasitic capacitance and improving the accuracy of the touch signal.

[0049] In one possible embodiment, as shown in FIG. 2, during a first time period in which 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 zeroth 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 a second time period in which 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 zeroth switch S0, the first switch S1, the fourth switch S4 and the fifth switch S5 are cyclically switched according to a third switch mode and a fourth switch mode; In the third switch mode, the zero 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 switch mode, the 0th 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 zero switch S0 and the first switch S1 are turned off, and the fourth switch S4 and the fifth switch S5 are turned on, thereby supplying a negative charge to the sensing point X through the second end of the compensation capacitor Ccomp, or transferring a positive charge at the sensing point X to the second end of the compensation capacitor Ccomp.

[0051] Exemplarily, in the fourth switch mode, the zero switch S0 and the first switch S1 are turned on, and the fourth switch S4 and the fifth switch S5 are turned off, thereby charging the first end of the compensation capacitor Ccomp using the power supply voltage VSP, and at this time, the second end of the compensation capacitor Ccomp is negatively charged and the first end is positively charged.

[0052] In the embodiment of the present disclosure, the number of cycles of the third switch mode and the fourth switch mode during 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 needs, and it should be understood that the more 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 embodiment of the present disclosure, the charge transfer can be cyclically performed to inject the negative charge in the compensation capacitor Ccomp to the sensing point X (or referred to as transferring the positive charge at the sensing point X to the second end of the compensation capacitor Ccomp), thereby compensating for the effect of parasitic capacitance and improving the accuracy of the touch signal.

[0054] In the embodiment of the present disclosure, during the period when 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. Moreover, in the embodiment of the present disclosure, the capacitance compensation for the entire period can be realized with only at least one compensation capacitor Ccomp, and compared with the technical solution using the complicated compensation capacitor Ccomp in the related art, the embodiment of the present disclosure can significantly reduce the circuit complexity, reduce the circuit area, and save the cost.

[0055] In an embodiment of the present disclosure, the charge amplifier circuit 110 outputs a capacitance change signal Vo so that a subsequent module can determine whether a touch has occurred. For example, an embodiment of the present disclosure 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 during the period when the excitation signal VSTIM rises from a low level to a high level to determine whether a touch has occurred, or may use the capacitance change signal Vo during the period when the excitation signal VSTIM falls from a high level to a low level to determine whether a touch has occurred. In addition, the capacitance change signal Vo during the period when the excitation signal VSTIM rises from the low level to the high level may be a first output voltage signal, and the capacitance change signal Vo during the period when the excitation signal VSTIM falls from the high level to the low level may be a second output voltage signal, and it may be determined whether a touch has occurred based on a difference signal between the first output voltage signal and the second output voltage signal. In the embodiments of the present disclosure, a specific implementation method for determining whether a touch has occurred is not limited, and a person skilled in the art can adopt an appropriate technical solution according to actual circumstances and needs to implement the method.

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

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

[0058] In the embodiment of the present disclosure, an excitation signal VSTIM and a charge at the sensing point X are received, the charge at the sensing point X is amplified, and a capacitance change signal Vo at the sensing point X is output. During the change in the level of the excitation signal VSTIM, a compensation charge is injected into the sensing point X, and the polarity of the compensation charge is set to be related to the change direction of the level of the excitation signal VSTIM, thereby compensating for and even eliminating the influence of the parasitic capacitance of the touch panel, improving the accuracy of touch detection, and saving the circuit area.

[0059] In one possible embodiment, the touch detection method comprises the steps of: 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 one possible embodiment, the touch detection method comprises the steps of: 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 positive charges into the sensing point X; or When the excitation signal VSTIM changes from a second level to a first level, the voltage of the sensing point X is initialized to the second level, and a negative charge is gradually injected into the sensing point X.

[0061] The touch detection method according to the embodiment of the present disclosure may be implemented by a processing component. Exemplarily, the processing component may include, but is not limited to, a separate processor, or a discrete component, or a combination of a processor and a discrete component. The processor may include a controller capable of executing instructions in an electronic device. The processor may be implemented in any suitable manner, such as 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. Within the processor, the executable instructions may 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 is a method corresponding to the touch detection device, and the detailed description thereof is referred to the description of the device above, and will not be described further herein.

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

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

[0065] In one possible embodiment, the display unit includes a display panel, which 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 electrowetting display panel, and a narrow pitch display panel.

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

[0067] By way of example, the electronic devices in this embodiment include, but are not limited to, desktop computers, televisions, mobile devices with large screens, such as mobile phones, tablet computers, and other common electronic devices that can be driven by cascading multiple chips.

[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, and exemplarily, some examples of terminals include a display, a smartphone or a portable 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 Internet of Vehicles (IOV), 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 an application program. The application program stored in the memory 1932 may include one or more modules, each corresponding to a set of instructions. It is noted that the processing component 1922 is configured to perform the above method by executing the 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 may operate based on an operating system stored in memory 1932, such as Windows Server®, Mac OS X™, Unix®, Linux®, FreeBSD™, or the like.

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

[0073] The above is merely an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.

[0074] The word "exemplary" herein means "serving as an example, example, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or superior over other embodiments.

[0075] It should be explained that, in this specification, the terms "comprising" and "having" or any variation thereof are intended to cover a non-exclusive inclusive, and a process, method, article, or device that includes a set of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to those processes, methods, articles, or devices. Absent more limitations, an element qualified by the phrase "including a..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0076] The flowcharts and block diagrams in the drawings illustrate the system architecture, functionality, and operation of possible implementations of the system, method, and computer program product according to several embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, program segment, or part of instructions, which includes one or more executable instructions for implementing a specified logical function. In some alternative embodiments, the functions depicted in the blocks may be implemented in a different order from that depicted in the drawings. For example, two consecutive blocks may be substantially executed in parallel, or may be executed in reverse order depending on the functionality. 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 with hardware that executes the specified function or operation, or by a combination of dedicated hardware and computer instructions.

[0077] Although the embodiments of the present disclosure have been described above, the above description is merely illustrative and not exhaustive, and is not limited to the embodiments disclosed. Various modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the embodiments described. The terms selected in this specification are intended to appropriately interpret the principles, practical applications, or improvements to the technology in the marketplace of the embodiments, or to allow other skilled in the art to understand the embodiments disclosed in the text.

Claims

1. A touch detection device, a charge amplifying circuit connected to a sensing point of the touch panel, for receiving an excitation signal and a charge at the sensing point, amplifying the charge at the sensing point, and outputting a capacitance change signal at the sensing point; and a capacitive compensation circuit connected to a sensing point of the touch panel for injecting a compensation charge, the polarity of which is associated with a direction of change in the level of the excitation signal, into the sensing point while the level of the excitation signal changes.

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

3. The capacitance compensation circuit includes: Initializing a voltage at the sensing point to the first level and gradually injecting a positive charge at the sensing point when the excitation signal changes from a first level to a second level higher than the first level; or 2. The touch detection device according to claim 1, further comprising: a first excitation signal for initiating a voltage of the sensing point to the second level and gradually injecting negative charges into the sensing point when the excitation signal changes from a second level to a first level.

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; a first end of the 0th switch, a first end of the second switch, and a first end of the fourth switch are all connected to a first end of the compensation capacitor, and a first end of the first switch, a first end of the third switch, and a first end of the fifth switch are all connected to a second end of the compensation capacitor; a second end of the first switch and a second end of the second switch are grounded, and a second end of the zero switch and a second end of the third switch are connected to a power supply voltage; a second end of the fifth switch is connected to the sensing point and a first end of the sixth switch; a positive input terminal of the first operational amplifier is connected to a second terminal of the sixth switch; 4 . The touch detection device according to claim 1 , wherein 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.

5. the charge amplifier circuit includes a seventh switch, an eighth switch, a ninth switch, a tenth switch, an integrating capacitor, and a second operational amplifier; a first terminal of the tenth switch is connected to the sensing point, and a second terminal of the tenth switch is connected to a first terminal of the eighth switch, a first terminal of the ninth switch, and a negative input terminal of the second operational amplifier; a second end of the eighth switch is connected to a first end of the integrating capacitor, and a first end of the seventh switch is connected to a second end of the integrating capacitor; a positive input terminal of the second operational amplifier is used to receive the excitation signal; 5. The touch detection device of claim 4, wherein an output terminal of the second operational amplifier is connected to a second terminal of the seventh switch and a second terminal of the ninth switch and is used to output the capacitance change signal.

6. During 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, a voltage at 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 zeroth switch, the first switch, the fourth switch, the fifth switch, the seventh switch and the eighth switch are turned off; During a second time period in which the excitation signal changes from a first level to a 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 a 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 5 , 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.

7. During 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, a voltage at the sensing point is initialized to the second level, and the zeroth 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; During a second time period in which the excitation signal changes from a second level to a first level, the seventh switch and the eighth switch are turned on, the ninth switch is turned off, and the zeroth 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 a third switch mode, the 0th switch and the 1st switch are turned off, and the 4th switch and the 5th switch are turned on, The touch detection device according to claim 5 , wherein in a fourth switch mode, the 0th switch and the 1st switch are turned on, and the 4th switch and the 5th switch are turned off.

8. 1. A touch detection method, comprising: receiving an excitation signal and a charge at a sensing point on the touch panel, amplifying the charge at the sensing point, and outputting a capacitance change signal at the sensing point; and injecting a compensation charge at the sensing point while the level of the excitation signal is changing, the compensation charge having a polarity related to a direction of change in the level of the excitation signal.

9. 9. The touch detection method of claim 8, further comprising: 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.

10. Initializing a voltage at the sensing point to the first level and gradually injecting a positive charge at the sensing point when the excitation signal changes from a first level to a second level higher than the first level; or 9. The touch detection method of claim 8, further comprising: initializing a voltage of the sensing point to the second level and gradually injecting negative charges into the sensing point when the excitation signal changes from a second level to a first level.

11. A chip comprising the touch detection device according to any one of claims 1 to 7.

12. A display device comprising a plurality of display units and the chip according to claim 11.

13. The display device of claim 12, wherein the display unit includes a display panel, the display panel including 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 electrowetting display panel, and a narrow pitch display panel.

14. An electronic device comprising the display device according to claim 12 or 13.

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