Driving circuit and method capable of saving area and touch display driving chip

Abstract

The invention provides an area-saving driving circuit and method and a touch display driving chip, the driving circuit comprises a touch sensing circuit, a common electrode driving circuit and a plurality of compensation capacitors, in a touch sensing period, the compensation capacitors are used for compensating parasitic capacitance on a sensing path, and the compensation capacitors are used for compensating parasitic capacitance on a common electrode driving circuit. The compensation capacitor is driven by the compensation voltage output by the common electrode driving circuit to counteract the parasitic capacitance on the sensing path; and in a display driving period, the compensation capacitor is multiplexed into a storage capacitor for maintaining the common voltage to be stable. By multiplexing the compensation capacitor and the common electrode driving circuit, the occupied area of the driving circuit on a touch display driving chip is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of driving circuits, and in particular relates to an area-saving driving circuit, method and touch display driving chip. Background Art

[0002] Display panels are widely used in consumer electronics such as mobile phones, watches, and tablet computers. In order to reduce costs, touch display driver chips have developed rapidly, which integrate the common electrode drive circuit for display and the touch sensing circuit for touch control into the touch display driver chip, thereby realizing an integrated design of touch control and display.

[0003] Specifically, the common electrode in the display panel is driven by the common electrode driving circuit during the display period, and the common electrode driving circuit is connected to a large off-chip storage capacitor to maintain the stability of the common voltage. The sensing electrode in the display panel is driven by the touch sensing circuit during the touch sensing period, but due to the parasitic capacitance of the display panel and the signal routing in the chip, the sensing signal in the touch sensing circuit is easily saturated. Therefore, in the prior art, compensation capacitors are usually used to offset the additional sensing signals introduced by the parasitic capacitance, and corresponding driving circuits are added. It is precisely because of the presence of large off-chip storage capacitors and the added driving circuit for driving the compensation capacitors that the driving circuit on the touch display driver chip occupies an increased area. Summary of the invention

[0004] The object of the present invention is to provide an area-saving driving circuit, method and touch display driving chip, which can reduce the occupied area of ​​the driving circuit on the touch display driving chip by reusing the compensation capacitor and the common electrode driving circuit.

[0005] To achieve the above-mentioned purpose, the first aspect of the present invention provides a method for saving the area of ​​a driving circuit, wherein the driving circuit includes a plurality of compensation capacitors. During a touch sensing period, the compensation capacitors are used to compensate for the parasitic capacitance on the sensing path. During a display driving period, the compensation capacitors are reused as storage capacitors for maintaining the stability of a common voltage.

[0006] Optionally, the driving circuit includes a touch sensing circuit and a common electrode driving circuit. During a touch sensing period, the compensation voltage output by the common electrode driving circuit drives the compensation capacitor to offset the parasitic capacitance on the sensing path.

[0007] Optionally, a first end of the compensation capacitor is connected to a compensation node of the touch sensing circuit, and the first end is also grounded through a first switch; and a second end of the compensation capacitor is connected to a voltage output end of the common electrode driving circuit.

[0008] Optionally, during a touch sensing period, the first switch disconnects the ground connection of the compensation capacitor, and the common electrode driving circuit outputs a compensation voltage to drive the compensation capacitor, so that the compensation capacitor provides capacitance compensation for the sensing path; during a display driving period, the first switch turns on the ground connection of the compensation capacitor so that the compensation capacitor is reused as a storage capacitor for maintaining the stability of the common voltage output by the common electrode driving circuit.

[0009] Optionally, the first end of the compensation capacitor is connected to the compensation node of the touch sensing circuit through a second switch. During the display driving period, the second switch disconnects the compensation capacitor from the compensation node of the touch sensing circuit to prevent the compensation capacitor from affecting the voltage of the compensation node.

[0010] A second aspect of the present invention provides an area-saving driving circuit, which includes: a multiplexer for selecting to output a common voltage to drive a common electrode during a display driving period, and to select to output a touch voltage to drive a sensing electrode during a touch sensing period; a plurality of compensation capacitors, wherein during the touch sensing period, the compensation capacitors are used to compensate for parasitic capacitance on a sensing path, and during the display driving period, the compensation capacitors are reused as storage capacitors for maintaining the stability of the common voltage.

[0011] Optionally, the area-saving driving circuit further includes: a touch sensing circuit; a common electrode driving circuit; during a display driving period, the common electrode driving circuit is allowed by the multiplexer to output a common voltage to drive the common electrode, and during a touch sensing period, the touch sensing circuit is allowed by the multiplexer to output a touch voltage to drive the sensing electrode.

[0012] Optionally, the touch sensing circuit includes: a second sub-driving module, used for outputting a sensing waveform and converting the sensed capacitance into a current signal; and a third sub-driving module, used for converting the current signal into a voltage signal.

[0013] Optionally, a compensation node is provided at the input end of the third sub-driving module, and the first end of the compensation capacitor is connected to the touch sensing circuit through the compensation node.

[0014] Optionally, the common electrode driving circuit includes a first sub-driving module, and the first sub-driving module outputs a common voltage in a display driving period or outputs a compensation voltage in a touch sensing period.

[0015] Optionally, the second end of the compensation capacitor is connected to an output end of the common electrode driving circuit.

[0016] Optionally, the first end of the compensation capacitor is also connected to the ground through a first switch.

[0017] Optionally, the first end of the compensation capacitor is directly connected to the compensation node, or is connected to the compensation node via a second switch.

[0018] Optionally, the sensing electrode is reused as the common electrode.

[0019] A third aspect of the present invention provides an area-saving touch display driver chip, comprising the area-saving driver circuit.

[0020] Compared with the prior art, the area-saving driving circuit, method and touch display driving chip provided by the present invention have at least the following beneficial effects: by using the compensation capacitor as a compensation capacitor for compensating the parasitic capacitance on the sensing path during the touch sensing period and reusing it as a storage capacitor for maintaining the stability of the common voltage during the display driving period, the setting of the large off-chip storage capacitor is reduced; at the same time, by reusing the common electrode driving circuit as a driving circuit for driving the compensation capacitor during the touch sensing period, the additional driving circuit specifically used to drive the compensation capacitor is reduced, thereby saving the occupied area of ​​the driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a driving circuit of a touch display driving chip provided by an embodiment of the present invention;

[0022] Figure 2 A schematic structural diagram of a touch sensing circuit and a common electrode driving circuit of a touch display driving chip provided by an embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of a touch sensing circuit and a common electrode driving circuit of another touch display driving chip provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a specific structure of a driving circuit of another touch display driving chip provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the attached embodiment of the present invention Figure 1 ~Attached Figure 4 , the technical solutions, structural features, objectives achieved and effects in the embodiments of the present invention are described in detail.

[0026] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0027] It should be noted that, in the present invention, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment.

[0028] First, the working principle of the driving circuit for touch sensing and display in the prior art is introduced. In the display driving period, the common electrode is driven by the output of the common electrode driving circuit selected by the multiplexer. At the same time, in order to maintain the voltage stability of the common electrode, the common electrode driving circuit is connected to an external large storage capacitor. In the touch sensing period, the sensing electrode is driven by the output of the touch sensing circuit selected by the multiplexer. Due to the presence of parasitic capacitance (such as the display panel capacitance C sp and chip trace capacitance C sc ), the induction generated by the parasitic capacitance is not only irrelevant to whether a touch is applied, but also saturates the sensing signal in the touch sensing circuit. Therefore, the prior art uses compensation capacitors to offset the sensing signal introduced by the parasitic capacitance, and adds corresponding additional driving circuits. Since each touch sensing circuit requires compensation capacitors for compensation, the existing driving circuit occupies an increased area, and these compensation capacitors are idle during the display driving period.

[0029] In view of the above-mentioned defects, the present invention is based on the time-sharing operation characteristics of the touch display driver chip, and drives the common electrode and the compensation capacitor in a time-sharing manner by reusing the compensation capacitor in the drive circuit and the common electrode drive circuit, so as to reduce the setting of a large off-chip storage capacitor and an additional drive circuit for driving the compensation capacitor, thereby saving the floor space of the drive circuit.

[0030] Based on the above-mentioned inventive concept, the present invention provides a method for saving the area of ​​a driving circuit, wherein the driving circuit includes a plurality of compensation capacitors, and the method includes: in a touch sensing period, the compensation capacitor is used to compensate for the parasitic capacitance on the sensing path, and in a display driving period, the compensation capacitor is reused as a storage capacitor for maintaining the stability of a common voltage. By reusing the compensation capacitor as a storage capacitor in the display driving period, the driving circuit does not need to be additionally provided with an off-chip large storage capacitor, which saves a large number of off-chip large storage capacitors in the prior art that are specifically used to maintain the stability of the common voltage, while effectively maintaining the stability of the common voltage, thereby ensuring the stability of the display effect, and also saving the occupied area of ​​the driving circuit.

[0031] Furthermore, the driving circuit includes a touch sensing circuit and a common electrode driving circuit. During the touch sensing period, the compensation voltage output by the common electrode driving circuit drives the compensation capacitor to offset the parasitic capacitance on the sensing path. By reusing the common electrode driving circuit to output the compensation voltage during the touch sensing period, the additional driving circuit corresponding to each compensation capacitor in the prior art is reduced, thereby saving the area occupied by the driving circuit.

[0032] Among them, the first end of the compensation capacitor is connected to the compensation node of the touch sensing circuit, and the first end of the compensation capacitor is also grounded through the first switch; the second end of the compensation capacitor is connected to the voltage output end of the common electrode driving circuit. Specifically, during the touch sensing period, the first switch disconnects the ground connection of the compensation capacitor, and the common electrode driving circuit outputs a compensation voltage to drive the compensation capacitor, so that the compensation capacitor provides capacitance compensation for the sensing path; by disconnecting the first switch, the compensation capacitor is prevented from being grounded and causing the charge to be released through the ground line, so that the compensation capacitor is at ground potential (0V) and cannot provide compensation voltage to the touch sensing circuit; during the display driving period, the first switch turns on the ground connection of the compensation capacitor so that the compensation capacitor is reused as a storage capacitor to maintain the stability of the common voltage output by the common electrode driving circuit, so that the common electrode driving circuit can provide a more stable voltage maintenance, thereby ensuring the stability and quality of the displayed image.

[0033] Furthermore, the first end of the compensation capacitor is connected to the compensation node of the touch sensing circuit through the second switch. During the display driving period, the second switch disconnects the compensation capacitor from the compensation node of the touch sensing circuit to avoid the compensation capacitor being grounded and lowering the voltage of the compensation node, thereby reducing the impact on the touch sensing circuit entering a preparation state before sensing, so that the input and output of the touch sensing circuit can be reset to the corresponding common mode level before sensing begins, thereby improving touch sensing efficiency.

[0034] Based on the above method for saving the area of ​​the driving circuit, the present invention also provides an area-saving driving circuit, such as Figure 1 As shown, the driving circuit includes: a multiplexer 100, which is connected to a common electrode 101 and a sensing electrode 102, and is used to select the output common voltage to drive the common electrode 101 during the display driving period, and to select the output touch voltage to drive the sensing electrode 102 during the touch sensing period; a plurality of compensation capacitors 200, which are used to compensate for the parasitic capacitance on the sensing path during the touch sensing period, and are reused as storage capacitors to maintain the stability of the common voltage during the display driving period. In this embodiment, by reusing the compensation capacitor 200 as a storage capacitor during the display driving period, the driving circuit does not need to set up an additional large off-chip storage capacitor, which saves a large number of off-chip large storage capacitors in the prior art that are specifically used to maintain the stability of the common voltage, and effectively maintains the stability of the common voltage, thereby ensuring the stability of the display effect and saving the occupied area of ​​the driving circuit.

[0035] Among them, Figure 1 As shown, the area-saving driving circuit also includes a touch sensing circuit 300 and a common electrode driving circuit 400. The first input terminal A1 of the touch sensing circuit 300 is connected to the touch voltage, and the second input terminal A2 of the touch sensing circuit 300 is connected to the compensation capacitor 200; the first input terminal B1 of the common electrode driving circuit 400 is connected to the common voltage, and the first output terminal B2 of the common electrode driving circuit 400 is connected to the compensation capacitor.

[0036] Specifically, during the display driving period, the common electrode driving circuit 400 is allowed by the multiplexer 100 to output the common voltage to drive the common electrode 101, and during the touch sensing period, the touch sensing circuit 300 is allowed by the multiplexer 100 to output the touch voltage to drive the sensing electrode 102. Further, during the touch sensing period, the common electrode driving circuit 400 is also allowed by the multiplexer 100 to output the compensation voltage to drive the compensation capacitor 200, so that the compensation capacitor 200 can provide capacitance compensation to the sensing path, thereby offsetting the sensing signal introduced by the parasitic capacitance on the sensing path. In this embodiment, the common voltage is a fixed level to drive the common electrode 101 to be in a voltage stable state, and during the display driving period, the touch sensing circuit 300 is in a non-working state.

[0037] Among them, Figure 2As shown, the common electrode driving circuit 400 includes a first sub-driving module 401, which outputs a common voltage during a display driving period or a compensation voltage during a touch sensing period to achieve time-sharing multiplexing of the first sub-driving module 401, thereby reducing the additional driving circuit used to drive the compensation capacitor and saving the area occupied by the driving circuit.

[0038] Among them, Figure 2 As shown, the touch sensing circuit 300 includes a second sub-driving module 301 and a third sub-driving module 302 connected in circuit, the second sub-driving module 301 is connected to the sensing electrode 101 through the multiplexer 100, and is used to output a sensing waveform and convert the sensed capacitance into a current signal; the third sub-driving module 302 is connected to the output end of the second sub-driving module 301, and is used to convert the current signal into a voltage signal, thereby realizing the measurement of the sensing capacitance. Further, the input end of the third sub-driving module 302 (i.e., the second input end A2 of the touch sensing circuit 300) is provided with a compensation node, and the first end of the compensation capacitor 200 is directly connected to the compensation node, so that the compensation capacitor 200 is connected to the touch sensing circuit 300, and then a compensation voltage can be provided to offset the parasitic capacitance on the sensing path.

[0039] Further, if Figure 2 As shown, the second end of the compensation capacitor 200 is connected to the first output end B2 of the common electrode driving circuit 400 (i.e., the output end of the first sub-driving module 401), so that the common electrode driving circuit 400 can output a compensation voltage during the touch sensing period to drive the compensation capacitor 200 to provide capacitance compensation for the sensing path. In this embodiment, when in the touch sensing period, the touch sensing circuit 300 outputs a sensing waveform, and the compensation voltage output by the common electrode driving circuit 400 has a voltage waveform opposite to the sensing waveform, thereby offsetting the parasitic capacitance on the sensing path.

[0040] Among them, in this embodiment, if Figure 2As shown, the first end of the compensation capacitor 200 is also connected to the ground through the first switch 201, and the first switch 201 is controlled to be opened and closed, so that the compensation capacitor 200 is used to compensate the parasitic capacitance on the sensing path and to be used as a storage capacitor to maintain the stability of the common voltage. Specifically, in the touch sensing period, the first switch 201 is opened, and the common electrode driving circuit 400 outputs a compensation voltage to drive the compensation capacitor 200 to provide capacitance compensation for the sensing path, so as to avoid the compensation capacitor 200 being grounded and causing the charge to be released through the ground line, so that the compensation capacitor 200 is at the ground potential (0V) and cannot provide the compensation voltage to the touch sensing circuit 300; in the display driving period, the first switch 201 is closed, so that the compensation capacitor 200 is connected to the ground, and at this time, the compensation capacitor 200 is reused as a storage capacitor to maintain the stability of the common voltage output by the common electrode driving circuit 400, so that the common electrode driving circuit 400 can provide a more stable voltage maintenance, thereby ensuring the stability and quality of the displayed image.

[0041] In another embodiment, if Figure 3 As shown, the first end of the compensation capacitor 200 can also be connected to the compensation node through the second switch 202, and the second switch 202 is located between the connection point C between the first switch 201 and the first end of the compensation capacitor 200 and the compensation node. During the display driving period, the second switch 202 is controlled to be disconnected to avoid the compensation capacitor 200 being grounded and pulling down the voltage of the compensation node (that is, the voltage of the compensation node is 0V), thereby affecting the touch sensing circuit 300 to enter the pre-sensing preparation state, so that the input and output of the touch sensing circuit 300 can be reset to the corresponding common mode level before the sensing starts. When the input and output are reset to the common mode level, the signal baseline used for sensing signal comparison can be stabilized at the common mode level, and the subsequent signal processing unit can more accurately quantify and process the change amount between the sensing signal and the signal baseline, reduce the error caused by the signal baseline fluctuation, improve the processing accuracy of the sensing signal, and improve the touch sensing efficiency.

[0042] It should be noted that the voltage values ​​of the common voltage, the sensing voltage and the compensation voltage can be selected according to actual conditions, and this application does not impose any restrictions on this.

[0043] Now combined Figure 4 An area-saving driving circuit provided by another embodiment of the present invention is described in detail.

[0044] Figure 4 FIG. 1 is a schematic diagram of a specific structure of an area-saving driving circuit provided by another embodiment of the present invention. Figure 4 As shown, the sensing electrode SX <k>For example, the sensing electrode SX <k>The first sub-driver module is connected to the second sub-driver module through a multiplexer MUX. The first sub-driver module includes a common operational amplifier VCOM_OP, the positive phase input terminal of the common operational amplifier VCOM_OP is connected to the common voltage reference voltage VCOM_REF, and the voltage value of the common voltage reference voltage is adjusted to achieve output voltages of different sizes; the negative phase input terminal of the common operational amplifier VCOM_OP is coupled to the output terminal of the common operational amplifier VCOM_OP, and the output terminal of the common operational amplifier VCOM_OP is connected to the compensation capacitor C comp The second sub-driving module includes a first operational amplifier OP1, and the non-inverting input terminal of the first operational amplifier OP1 is connected to the sensing reference voltage V sx The negative phase input terminal of the first operational amplifier OP1 is coupled to the output terminal of the first operational amplifier OP1. The third sub-driving module includes a second operational amplifier OP2, and the positive phase input terminal of the second operational amplifier OP2 is respectively connected to the compensation capacitor C comp The first end of the first operational amplifier OP1 is connected to the output end of the first operational amplifier OP1 through a mirror circuit, and the negative input end of the second operational amplifier OP2 is connected to the reference voltage V ref The output end of the second operational amplifier OP2 is connected to an ADC module (analog-to-digital converter, not shown in the figure).

[0045] In a specific embodiment, Figure 4 As shown, during the touch sensing period, the first operational amplifier OP1 generates a sensing voltage to drive the capacitor (including the touch capacitor C T , Display panel capacitance C sp and chip trace capacitance C sc ) generates current and copies it in a certain proportion to obtain the current signal I sense , and the current signal I sense At the same time, the first switch S1 is disconnected from the ground and the second switch S2 is in a closed state, and the output terminal of the common operational amplifier VCOM_OP outputs a compensation voltage to drive the compensation capacitor C comp Provides reverse current I comp To offset the display panel capacitance C sp and chip trace capacitance C sc Further, the second operational amplifier OP2 converts the offset current into a voltage and compares it with the reference voltage V ref After comparison, two differential voltage signals VOP are obtained. <k>and VON <k>The output terminal of the second operational amplifier OP2 generates the differential voltage signal VOP <k>and VON <k>The signal is sent to the ADC module for subsequent signal processing to complete the driving process of the touch sensing period.

[0046] During the display driving period, the first operational amplifier OP1 and the second operational amplifier OP2 are in a non-operating state, and the sensing electrode SX <k>The first switch S1 is closed and the second switch S2 is open. The common operational amplifier VCOM_OP outputs a common voltage to drive the common electrode. At this time, the compensation capacitor C comp The first switch S1 is grounded and reused as a storage capacitor to maintain a stable common voltage, thereby ensuring a stable display effect.

[0047] An embodiment of the present invention further discloses an area-saving touch display driver chip, wherein the touch display driver chip includes the area-saving driver circuit described in any one of the above embodiments.

[0048] In summary, the present invention provides an area-saving driving circuit, method and touch display driver chip, which reduces the setting of large off-chip storage capacitors by using the compensation capacitor 200 as a compensation capacitor for compensating the parasitic capacitance on the sensing path during the touch sensing period and reusing it as a storage capacitor for maintaining the stability of the common voltage during the display driving period; at the same time, by reusing the common electrode driving circuit 400 as a driving circuit for driving the compensation capacitor 200 during the touch sensing period, the additional driving circuit specifically used to drive the compensation capacitor 200 is reduced, thereby saving the area occupied by the driving circuit.

[0049] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.< / k> < / k> < / k> < / k> < / k> < / k> < / k>

Claims

1. A method for saving driving circuit area, characterized in that: The driving circuit includes a plurality of compensation capacitors. During a touch sensing period, the compensation capacitors are used to compensate for parasitic capacitance on a sensing path. During a display driving period, the compensation capacitors are reused as storage capacitors for maintaining a stable common voltage.

2. The method according to claim 1, characterized in that The driving circuit includes a touch sensing circuit and a common electrode driving circuit. During a touch sensing period, the compensation voltage output by the common electrode driving circuit drives the compensation capacitor to offset the parasitic capacitance on the sensing path.

3. The method according to claim 2, characterized in that The first end of the compensation capacitor is connected to the compensation node of the touch sensing circuit, and the first end is also grounded through a first switch; the second end of the compensation capacitor is connected to the voltage output end of the common electrode driving circuit.

4. The method according to claim 3, characterized in that During a touch sensing period, the first switch disconnects the ground connection of the compensation capacitor, and the common electrode driving circuit outputs a compensation voltage to drive the compensation capacitor, so that the compensation capacitor provides capacitance compensation for the sensing path; During the display driving period, the first switch turns on the ground connection of the compensation capacitor so that the compensation capacitor is reused as a storage capacitor to maintain the stability of the common voltage output by the common electrode driving circuit.

5. The method according to any one of claims 2 to 4, characterized in that: The first end of the compensation capacitor is connected to the compensation node of the touch sensing circuit through a second switch. During the display driving period, the second switch disconnects the compensation capacitor from the compensation node of the touch sensing circuit to prevent the compensation capacitor from affecting the voltage of the compensation node.

6. An area-saving driving circuit, characterized in that: include: A multiplexer, used for selecting to output a common voltage to drive the common electrode during a display driving period, and for selecting to output a touch voltage to drive the sensing electrode during a touch sensing period; A plurality of compensation capacitors are used to compensate for parasitic capacitance on the sensing path during the touch sensing period, and are reused as storage capacitors for maintaining a stable common voltage during the display driving period.

7. The area-saving driving circuit according to claim 6, characterized in that: Also included is a touch sensing circuit; Common electrode driving circuit; In the display driving period, the common electrode driving circuit is allowed by the multiplexer to output a common voltage to drive the common electrode, and in the touch sensing period, the touch sensing circuit is allowed by the multiplexer to output a touch voltage to drive the sensing electrode.

8. The area-saving driving circuit according to claim 7, characterized in that: The touch sensing circuit comprises: A second sub-driving module, used for outputting a sensing waveform and converting the sensed capacitance into a current signal; The third sub-driving module is used to convert the current signal into a voltage signal.

9. The area-saving driving circuit according to claim 8, characterized in that: A compensation node is provided at the input end of the third sub-driving module, and the first end of the compensation capacitor is connected to the touch sensing circuit through the compensation node.

10. The area-saving driving circuit according to any one of claims 7 to 9, characterized in that: The common electrode driving circuit includes a first sub-driving module, which outputs a common voltage in a display driving period or a compensation voltage in a touch sensing period.

11. The area-saving driving circuit according to claim 10, characterized in that: The second end of the compensation capacitor is connected to the output end of the common electrode driving circuit.

12. The area-saving driving circuit according to claim 9, characterized in that: The first end of the compensation capacitor is also connected to the ground through a first switch.

13. The area-saving driving circuit according to claim 9, characterized in that: The first end of the compensation capacitor is directly connected to the compensation node, or is connected to the compensation node through a second switch.

14. The area-saving driving circuit according to claim 6, characterized in that: The sensing electrode is reused as the common electrode.

15. An area-saving touch display driver chip, comprising the area-saving driver circuit according to any one of claims 6 to 14.

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