Capacitive touch sensing device and touch sensing method

Abstract

The invention discloses a capacitive touch sensing device and a touch sensing method. The capacitive touch sensing device comprises a touch panel and a touch sensing control circuit. A touch electrode layer of the touch panel comprises a plurality of first electrodes extending in the first direction and a plurality of second electrodes extending in the second direction. At a first moment, the touch sensing control circuit provides a first driving signal to one part of the driving electrodes, provides a second driving signal to the other part of the driving electrodes, and receives sensing capacitance generated by the sensing electrodes. The first driving signal and the second driving signal are non-in-phase pulse signals. At the second moment, the touch sensing control circuit provides third driving signals of the same phase to all the driving electrodes, the capacitance change of the sensing capacitance of the same sensing electrode at the first moment and the capacitance change of the sensing capacitance of the same sensing electrode at the second moment are calculated, and when the capacitance change is larger than or equal to a preset value, the third driving signals are output. The touch sensing control circuit identifies a touch object at a position corresponding to the sensing electrode as a grounding conductor.

Description

Capacitive touch sensing device and touch sensing method Technical Field

[0001] The present invention relates to the field of touch sensing technology, and in particular to a capacitive touch sensing device and a touch sensing method. Background Art

[0002] Capacitive touch sensing devices include self-capacitive and mutual-capacitive types. Taking the mutual-capacitive touch sensing device as an example, it includes at least one driving electrode and at least one sensing electrode located under the cover plate. During touch sensing, the driving electrode is driven by a driving voltage and senses the sensing capacitance between the sensing electrode and the driving electrode. When a touch operation is performed on the cover plate using a finger or a grounded conductor, the capacitance value of the sensing capacitor will change. When there is a non-grounded conductor (such as water droplets, water mist, coins, etc.) on the cover plate, it will also cause the capacitance value of the sensing capacitor to change, which will cause the touch sensing device to identify the non-grounded conductor as a grounded conductor, thereby causing false sensing.

[0003] Summary of the Invention

[0004] The main purpose of the present invention is to provide a capacitive touch sensing device and a touch sensing method, which aim to solve the problem in the prior art of how to prevent non-grounded conductors from being mis-sensed.

[0005] A capacitive touch sensing device, comprising a touch panel and a touch sensing control circuit; the touch panel comprises a cover plate and a touch electrode layer stacked in sequence from top to bottom; the touch electrode layer is patterned to form a plurality of first electrodes extending in a first direction and a plurality of second electrodes extending in a second direction; the touch sensing control circuit is electrically connected to the first electrodes and the second electrodes; the touch sensing phase comprises at least one first moment and at least one second moment; during the first moment and the second moment, the first electrode serves as a driving electrode and the second electrode serves as a sensing electrode; at the first moment, the touch sensing control circuit provides a first driving signal to a portion of the driving electrodes and provides a second driving signal to another portion of the driving electrodes, and receives a sensing capacitance generated by each of the sensing electrodes; wherein the first driving signal and the second driving signal are non-in-phase pulses pulse signal; at the second moment, the touch sensing control circuit provides a third driving signal to each of the driving electrodes and receives the sensing capacitance generated by each of the sensing electrodes, wherein the third driving signal received by each of the driving electrodes is an in-phase pulse signal; the touch sensing control circuit further calculates a capacitance change between the sensing capacitance sensed by the same sensing electrode at the first moment and the sensing capacitance sensed by the same sensing electrode at the second moment, and compares the calculation with a preset value; when the capacitance change is greater than or equal to the preset value, the touch sensing control circuit identifies the touching object at the corresponding position of the sensing electrode as a grounded conductor; when the capacitance change is less than the preset value, the touch sensing control circuit identifies the touching object at the corresponding position of the sensing electrode as a non-grounded conductor; the non-in-phase pulse signal is a pulse signal having at least one of a different frequency, amplitude, and phase; the in-phase pulse signal is a pulse signal having the same frequency, amplitude, and phase.

[0006] Furthermore, to achieve the above-mentioned objectives, the present invention further provides a touch sensing method, which is applied to a capacitive touch sensing device, wherein the capacitive touch sensing device includes a touch panel and a touch sensing control circuit; the touch panel includes a cover plate and a touch electrode layer stacked sequentially from top to bottom; the touch electrode layer is patterned to form a plurality of first electrodes extending along a first direction and a plurality of second electrodes extending along a second direction; wherein, at any time during a touch sensing phase, one of the first electrode and the second electrode serves as a driving electrode, and the other serves as a sensing electrode; the touch sensing control circuit is electrically connected to the first electrode and the second electrode; and the touch sensing method comprises:

[0007] Setting the first electrode as the driving electrode and setting the second electrode as the sensing electrode;

[0008] providing a first driving signal to a portion of the driving electrodes and a second driving signal to another portion of the driving electrodes at a first moment, and receiving a sensing capacitance generated by each of the sensing electrodes; wherein the first driving signal and the second driving signal are non-in-phase pulse signals;

[0009] providing a third driving signal to each driving electrode at a second moment, and receiving a sensing capacitance generated by each sensing electrode, wherein the third driving signal received by each driving electrode is an in-phase pulse signal;

[0010] calculating a capacitance change between the sensing capacitance sensed by the same sensing electrode at the first moment and the sensing capacitance sensed by the same sensing electrode at the second moment;

[0011] Determining whether the capacitance change is greater than or equal to a preset value;

[0012] When the capacitance change is less than the preset value, identifying that the touch object corresponding to the sensing electrode position is a non-ground conductor;

[0013] When the capacitance change is greater than or equal to the preset value, identifying the touch object corresponding to the sensing electrode position as a ground conductor;

[0014] The non-in-phase pulse signal is a pulse signal having at least one of different frequency, amplitude and phase; the in-phase pulse signal is a pulse signal having the same frequency, amplitude and phase.

[0015] The capacitive touch sensing device and touch sensing method provide non-in-phase drive signals to the drive electrodes at one time point in the touch sensing phase, and provide in-phase drive signals to each of the drive electrodes at another time point in the touch sensing phase. The method detects the degree of change in the sensed capacitance received by the same sensing electrode at two different times. When the degree of change in the sensed capacitance is small, the device identifies the conductor as a non-grounded conductor, thereby eliminating false sensing caused by the non-grounded conductor and preventing false sensing by the capacitive touch sensing device. This improves the touch detection accuracy of the capacitive touch sensing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0017] FIG1 is a schematic diagram of a capacitive touch sensing device according to a preferred embodiment of the present invention.

[0018] FIG. 2 is a schematic diagram of a module of the touch electrode layer shown in FIG. 1 .

[0019] FIG. 3 is a schematic diagram of the touch electrode layer and its loading signal at the first moment t1 in FIG. 2 .

[0020] FIG. 4 is a schematic diagram of the touch electrode layer and its loading signal at the first moment t2 in FIG. 2 .

[0021] FIG. 5 is a schematic diagram showing changes in the sensing capacitance of the sensing electrode at the first moment t1 and the first moment t2 in FIG. 2 .

[0022] FIG6 is a flow chart of a touch sensing method according to a preferred embodiment of the present invention.

[0023] FIG. 7 is a flow chart of the touch sensing method shown in FIG. 6 .

[0024] Key Component Symbols Capacitive Touch Sensing Device 1 Touch Panel 10 Display Panel 20 Cover 11 Touch Electrode Layer 12 First Electrodes 121_1-121_m Second Electrodes 123_1-123_n Driving Electrodes Tx1-Txm, Tx1-Txn Sensing Electrodes Rx1-Rxn, Rx1-Rxm Touch Display Area 101 Non-Display Area 103 Touch Sensing Control Circuit 30 Touch Sensing Lines 31 Steps S600-S614

[0025] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0027] The terms "first," "second," and "third" in the specification of the present invention and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "include" and any variations thereof are intended to cover non-exclusive inclusions.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Specific implementations of the capacitive touch sensing device and the touch sensing method of the present invention are described below with reference to the accompanying drawings.

[0030] Please refer to Figure 1, which is a schematic diagram of a capacitive touch sensing device 1. The capacitive touch sensing device 1 can be a portable device such as a personal computer, tablet computer, smartphone, personal digital assistant (PDA), game console, interactive Internet Protocol Television (IPTV), smart wearable device, navigation device, etc., or a fixed device such as a desktop computer, server, digital television, etc. The capacitive touch sensing device 1 can further include a fingerprint recognition function, a display function, and a camera function, or a combination thereof.

[0031] The capacitive touch sensing device 1 includes a touch panel 10 and a display panel 20. The touch panel 10 is used to sense a user's touch operation. The touch panel 10 includes a cover plate 11 and a touch electrode layer 12 stacked sequentially from top to bottom.

[0032] The cover plate 11 may be a glass substrate or other transparent substrate with high strength and hardness. In at least one embodiment of the present invention, the cover plate 11 may be made of a material such as polycarbonate (PC), polyester (PET), polymethylmethacrylate (PMMA), cycloolefin copolymer (COC), or polyether sulfone (PES).

[0033] Please also refer to Figure 2, which is a schematic diagram of the touch electrode layer 12 module. The touch electrode layer 12 is made of a conductive material and can be patterned to form a plurality of first electrodes 121_1 to 121_m and a plurality of second electrodes 123_1 to 123_n. m and n are positive integers and can be the same or different. The plurality of first electrodes 121_1 to 121_m extend along a first direction X and are arranged parallel to each other, and the plurality of second electrodes 123_1 to 123_n extend along a second direction Y and are arranged parallel to each other. In at least one embodiment of the present invention, the first direction X is perpendicular to the second direction Y. In other embodiments, the first direction X and the second direction Y can intersect at other angles. At any time during the touch sensing phase T1, one of the first electrodes 121_1 to 121_m and the second electrodes 123_1 to 123_n serves as the drive electrodes Tx1 to Txm (as shown in Figure 3), and the other serves as the sensing electrodes Rx1 to Rxn (as shown in Figure 3). When a ground conductor (such as a finger or stylus) is placed on the cover 11, the capacitance generated between the sensing electrode Rx and the driving electrode is reduced. In this embodiment, the touch electrode layer 12 is a two-layer conductive structure to form a mutual capacitance touch sensing structure.

[0034] In other embodiments of the present invention, the touch electrode layer 12 may be a single-layer conductive structure to form a self-capacitive touch sensing structure.

[0035] The display panel 20 is located below the touch panel 10 and is used to display images. In at least one embodiment of the present invention, the display panel 20 is an OLED display structure, which may include a first electrode layer, a second electrode layer, a hole injection layer, a hole transport layer, a light-emitting layer, and an electron injection layer. In other embodiments, the display panel 20 may also be a liquid crystal display structure or other display structure.

[0036] 1 , the capacitive touch sensing device 1 defines a touch display area 101 and a non-display area 103 surrounding the touch display area 101. A plurality of first electrodes 121_1 to 121_m and a plurality of second electrodes 123_1 to 123_n are located within the touch display area 101 and may extend into the non-display area 103.

[0037] Referring to Figure 2, the capacitive touch sensing device 1 also includes a touch sensing control circuit 30. The touch sensing control circuit 30 can be disposed in the non-display area 103 and electrically connected to the plurality of first electrodes 121_1 to 121_m and the plurality of second electrodes 123_1 to 123_n via touch sensing lines 31. The touch sensing control circuit 30 is configured to provide a driving signal to the plurality of driving electrodes Tx1 to Txm during the touch sensing phase T1 and receive a sensing capacitance generated by each of the sensing electrodes Rx1 to Rxn. In at least one embodiment of the present invention, the touch sensing control circuit 30 uses the driving electrodes Tx1 to Txm as the first electrodes 121_1 to 121_m and the sensing electrodes Rx1 to Rxn as the second electrodes 123_1 to 123_n.

[0038] The specific working principle of the capacitive touch sensing device 1 is as follows:

[0039] The touch sensing phase T1 includes at least one first moment t1 and at least one second moment t2, wherein the first moment t1 and the second moment t2 are alternately arranged.

[0040] Please also refer to Figure 3, which is a schematic diagram of the touch electrode layer 12 and its applied signals at the first moment t1. At the first moment t1, the touch sensing control circuit 30 provides a first drive signal DR1 to a portion of the drive electrodes Tx1-Txm and a second drive signal DR2 to another portion of the drive electrodes Tx1-Txm, receiving the sensing capacitance S1-Sn generated by each of the sensing electrodes Rx1-Rxn. The first drive signal DR1 and the second drive signal DR2 are non-in-phase pulse signals. In at least one embodiment of the present invention, the non-in-phase pulse signals are pulse signals that differ in at least one of frequency, amplitude, and phase; the in-phase pulse signals are pulse signals that have the same frequency, amplitude, and phase. It is understood that the amplitude and phase of the in-phase pulse signals may have slight deviations due to other reasons such as signal loss, but the frequency of the in-phase pulse signals must remain consistent. Taking Figure 3 as an example, the first drive signal DR1 and the second drive signal DR2 have different frequencies, amplitudes, or phases.

[0041] In at least one embodiment of the present invention, at the first moment t1, the touch sensing control circuit 30 provides the first drive signal DR1 to the odd-numbered electrodes of the drive electrodes Tx1 to Txm, and provides the second drive signal DR2 to the even-numbered electrodes of the drive electrodes Tx1 to Txm. In other embodiments, at the first moment t1, the touch sensing control circuit 30 may also provide the first drive signal DR1 or the second drive signal DR2 to the drive electrodes Tx1 to Txm at specific locations. For example, at the first moment t1, the touch sensing control circuit 30 may provide the first drive signal DR1 to the drive electrodes Tx2 to Tx(m-1) located in the middle of the touch display area 101, and provide the second drive signal DR2 to the drive electrode Tx1 and the drive electrode Txm located at the edge of the touch display area 101.

[0042] In at least one embodiment of the present invention, at the first moment t1, the touch sensing control circuit 30 simultaneously receives the sensing capacitance S1 to Sn generated by each of the sensing electrodes Rx1 to Rxn. In this mode, the cost of the capacitive touch sensing device 1 is relatively high, but the signal sensing time is relatively fast. In other embodiments, the touch sensing control circuit 30 may also receive the sensing capacitance S1 to Sn generated by each of the sensing electrodes Rx1 to Rxn in a time-sharing manner. For example, at the first moment t1, the touch sensing control circuit 30 receives the sensing capacitance S1 to Si generated by the sensing electrodes Rx1 to Rxi, and receives the sensing capacitance S(i+1) to Sn generated by the sensing electrodes Rx(i+1) to Rxn at other moments between the first moment t1 and the second moment t2. Wherein, i is a positive integer greater than 1 and less than n. In this mode, the cost of the capacitive touch sensing device 1 is relatively low, but the signal sensing time is relatively slow.

[0043] Please also refer to Figure 4, which is a schematic diagram of the touch electrode layer 12 and its applied signals at the second time t2. At the second time t2, the touch sensing control circuit 30 provides a third driving signal DR3 to each of the driving electrodes Tx1-Txm and receives the sensing capacitance generated by each of the sensing electrodes Rx1-Rxn. The third driving signal DR3 received by each of the driving electrodes Tx1-Txm is an in-phase pulse signal.

[0044] In at least one embodiment of the present invention, the third drive signal DR3 is in phase with the first drive signal DR1. In other embodiments, the third drive signal DR3 may be in phase with the second drive signal DR2. Alternatively, the third drive signal DR3 may be a drive signal different from the first drive signal DR1 and the second drive signal DR2.

[0045] The touch sensing control circuit 30 calculates a capacitance change between the sensing capacitances Si_t1-Si_t1 sensed by the same sensing electrode Rxi among the sensing electrodes Rx1-Rxn at the first time t1 and the sensing capacitances Si_t2-Si_t2 sensed by the same sensing electrode Rxi at the second time t2. When the capacitance change is greater than or equal to a preset value, the touch sensing control circuit 30 identifies the touched object at the position corresponding to the sensing electrode Rxi as a non-grounded conductor (e.g., a water droplet, water mist, a coin, etc.). When the capacitance change is less than the preset value, the touch sensing control circuit 30 identifies the touched object at the position corresponding to the sensing electrode Rxi as a grounded conductor.

[0046] Please also refer to FIG. 5 , which is a schematic diagram illustrating the change in the sensed capacitance of the sensing electrodes Rx1 to Rx36 at the first moment t1 and the first moment t2. Assuming a preset value of 500 units, the sensed capacitance of the sensing electrode Rx11 at the first moment t1 is 1506 units, and the sensed capacitance at the second moment t2 is 572 units; the sensed capacitance of the sensing electrode Rx12 at the first moment t1 is 2108 units, and the sensed capacitance at the second moment t2 is 952 units; the sensed capacitance of the sensing electrode Rx13 at the first moment t1 is 1244 units, and the sensed capacitance at the second moment t2 is 464 units. The change in the sensed capacitance of the sensing electrode Rx11 between the first moment t1 and the second moment t2 is 934 units, which is greater than or equal to the preset value. Therefore, the touch sensing control circuit 30 identifies the touch object corresponding to the position of the sensing electrode Rx11 as a grounded conductor. Similarly, the touch sensing control circuit 30 identifies that the touch object corresponding to the position of the sensing electrode Rx12 and the sensing electrode Rx13 is a ground conductor.

[0047] At the same time, the sensing capacitance value of the sensing electrode Rx23 at the first moment t1 is 214, and the sensing capacitance value at the second moment t2 is -8; the sensing capacitance value of the sensing electrode Rx24 at the first moment t1 is 348, and the sensing capacitance value at the second moment t2 is -16; the sensing capacitance value of the sensing electrode Rx25 at the first moment t1 is 406, and the sensing capacitance value at the second moment t2 is -12; the sensing capacitance value of the sensing electrode Rx26 at the first moment t1 is 316, and the sensing capacitance value at the second moment t2 is -16; the sensing capacitance value of the sensing electrode Rx27 at the first moment t1 is 292, and the sensing capacitance value at the second moment t2 is -8; the sensing capacitance value of the sensing electrode Rx28 at the first moment t1 is 210, and the sensing capacitance value at the second moment t2 is -4. The change in the sensed capacitance of sensing electrode Rx23 between the first time t1 and the second time t2 is 222, which is less than the preset value. Therefore, the touch sensing control circuit 30 identifies the touch object corresponding to the position of sensing electrode Rx23 as a non-grounded conductor. Similarly, the touch sensing control circuit 30 identifies the touch object corresponding to the positions of sensing electrodes Rx24 to Rx28 as a grounded conductor.

[0048] In other embodiments, the touch sensing control circuit 30 may also provide a third drive signal DR3 to each of the drive electrodes Tx1-Txm at the first time t1 and receive a sensing signal generated by each of the sensing electrodes Rx1-Rxn. The third drive signal DR3 received by each of the drive electrodes Tx1-Txm is an in-phase pulse signal. At the second time t2, the touch sensing control circuit 30 provides the first drive signal DR1 to a portion of the drive electrodes Tx1-Txm, provides the second drive signal DR2 to another portion of the drive electrodes Tx1-Txm, and receives the sensing signals S1-Sn generated by each of the sensing electrodes Rx1-Rxn.

[0049] In another embodiment, the touch sensing phase T1 further includes at least one third moment t3 and at least one fourth moment t4. The touch sensing control circuit 30 sequentially passes through the first to fourth moments t1-t4. At the third moment t3 and the fourth moment t4, the first electrodes 121_1-121_m function as the sensing electrodes Rx1-Rxm, and the second electrodes 123_1-123_n function as the driving electrodes Tx1-Txn. At the third moment t3, the touch sensing control circuit 30 repeats the operations described above for the first moment t1; at the fourth moment t4, the touch sensing control circuit 30 repeats the operations described above for the second moment t2. The touch sensing control circuit 30 further determines the two-dimensional position of the ground conductor on the capacitive touch sensing device 1 based on the position of the sensing electrode Rxi corresponding to the ground conductor identified at the first moment t1 and the second moment t2, i.e., the position in the first dimension. Furthermore, the position of the sensing electrode Rxk corresponding to the ground conductor identified at the third moment t3 and the fourth moment t4, i.e., the position in the second dimension.

[0050] The capacitive touch sensing device 1 provides non-in-phase drive signals to the drive electrodes at one time point in the touch sensing phase T1, and provides in-phase drive signals to each of the drive electrodes at another time point in the touch sensing phase T1. The device compares the changes in the sensed capacitance received by the same sensing electrode at the two different times. When the change in the sensed capacitance is small, the device identifies the electrode as a non-grounded conductor, thereby eliminating false sensing caused by the non-grounded conductor. This prevents false sensing by the capacitive touch sensing device 1, thereby improving the touch detection accuracy of the capacitive touch sensing device 1.

[0051] Please refer to FIG6 , which is a flow chart of a touch sensing method. In at least one embodiment of the present invention, the touch sensing method is applied to the capacitive touch sensing device 1. The touch sensing method comprises the following steps:

[0052] Step S600 : setting the first electrodes 121_1 ˜ 121_m as the driving electrodes Tx1 ˜Txm, and setting the second electrodes 123_1 ˜ 123_n as the sensing electrodes Rx1 ˜Rxn.

[0053] In step S601 , at a first moment t1 , a first driving signal DR1 is provided to a portion of the driving electrodes Tx1 to Txm, and a second driving signal DR2 is provided to another portion of the driving electrodes Tx1 to Txm, to receive sensing capacitance S1 to Sn generated by each sensing electrode Rx1 to Rxn.

[0054] Among them, the first drive signal DR1 and the second drive signal DR2 are non-in-phase pulse signals. In at least one embodiment of the present invention, the non-in-phase pulse signals are pulse signals that differ in at least one of frequency, amplitude, and phase; the in-phase pulse signals are pulse signals that have the same frequency, amplitude, and phase. It is understandable that the amplitude and phase of the in-phase pulse signals may have slight deviations due to other reasons such as signal loss, but the frequency of the in-phase pulse signals must remain consistent. Taking Figure 3 as an example, the first drive signal DR1 and the second drive signal DR2 have different frequencies, amplitudes, or phases.

[0055] In at least one embodiment of the present invention, at the first moment t1, the touch sensing control circuit 30 provides the first drive signal DR1 to the odd-numbered electrodes of the drive electrodes Tx1 to Txm, and provides the second drive signal DR2 to the even-numbered electrodes of the drive electrodes Tx1 to Txm. In other embodiments, at the first moment t1, the touch sensing control circuit 30 may also provide the first drive signal DR1 or the second drive signal DR2 to the drive electrodes Tx1 to Txm at specific locations. For example, at the first moment t1, the touch sensing control circuit 30 may provide the first drive signal DR1 to the drive electrodes Tx2 to Tx(m-1) located in the center of the touch display area 101, and provide the second drive signal DR2 to the drive electrodes Tx1 and the drive electrodes Txm at the edges of the touch display area 101.

[0056] In at least one embodiment of the present invention, at the first moment t1, the touch sensing control circuit 30 simultaneously receives the sensing capacitance S1 to Sn generated by each of the sensing electrodes Rx1 to Rxn. In this mode, the cost of the capacitive touch sensing device 1 is relatively high, but the signal sensing time is relatively fast. In other embodiments, the touch sensing control circuit 30 may also receive the sensing capacitance S1 to Sn generated by each of the sensing electrodes Rx1 to Rxn in a time-sharing manner. For example, at the first moment t1, the touch sensing control circuit 30 receives the sensing capacitance S1 to Si generated by the sensing electrodes Rx1 to Rxi, and receives the sensing capacitance S(i+1) to Sn generated by the sensing electrodes Rx(i+1) to Rxn at other moments between the first moment t1 and the second moment t2. Wherein, i is a positive integer greater than 1 and less than n. In this mode, the cost of the capacitive touch sensing device 1 is relatively low, but the signal sensing time is relatively slow.

[0057] Step S602 : providing a third driving signal DR3 to each of the driving electrodes Tx1 ˜Txm at a second time t2 , and receiving a sensing capacitance generated by each of the sensing electrodes Rx1 ˜Rxn.

[0058] The third drive signal DR3 received by each of the drive electrodes Tx1 to Txm is an in-phase pulse signal. In at least one embodiment of the present invention, the third drive signal DR3 may be in-phase with the first drive signal DR1. In other embodiments, the third drive signal DR3 may be in-phase with the second drive signal DR2. Alternatively, the third drive signal DR3 may be a drive signal different from the first drive signal DR1 and the second drive signal DR2.

[0059] Step S603 : calculating a capacitance change between the sensing capacitance Si_t1 sensed by the same sensing electrode Rxi at the first time t1 and the sensing capacitance Si_t2 sensed by the same sensing electrode Rxi at the second time t2 .

[0060] Step S604: determine whether the capacitance change is greater than or equal to a preset value.

[0061] In step S605 , when the capacitance change is greater than or equal to the preset value, the touch sensing control circuit 30 identifies that the touch object corresponding to the position of the sensing electrode Rxi is a ground conductor.

[0062] Step S606 : When the capacitance change is less than the preset value, the touch sensing control circuit 30 identifies that the touch object corresponding to the position of the sensing electrode Rxi is a non-ground conductor.

[0063] Please also refer to FIG7 , which is a flow chart of the touch sensing method. The touch sensing method may further include the following steps:

[0064] S607 , setting the second electrodes 123_1 ˜ 123_n as the driving electrodes Tx1 ˜Txn, and setting the first electrodes 121_1 ˜ 121_m as the sensing electrodes Rx1 ˜Rxm.

[0065] S608, at a third moment t3, providing the first drive signal DR1 to a portion of the drive electrodes Tx1~Txn, and providing the second drive signal DR2 to another portion of the drive electrodes Tx1~Txn, receiving the sensing capacitance S1~Sm generated by each of the sensing electrodes Rx1~Rxm.

[0066] S609 , providing a third driving signal DR3 to each of the driving electrodes Tx1 ˜Txn at a fourth time t3 , and receiving a sensing capacitance generated by each of the sensing electrodes Rx1 ˜Rxm.

[0067] In at least one embodiment of the present invention, the touch sensing control circuit 30 sequentially passes through the first to the fourth time points t1 to t4.

[0068] S610 , calculating a capacitance change between the sensing capacitor Sk_t3 sensed by the same sensing electrode Rxk at the third time t3 and the sensing capacitor Sk_t4 sensed by the same sensing electrode Rxk at the fourth time t4 .

[0069] In at least one embodiment of the present invention, k is a positive integer greater than 1 and less than m.

[0070] S611, determining whether the capacitance change is greater than or equal to the preset value.

[0071] S612 : When the capacitance change is greater than or equal to the preset value, the touch sensing control circuit 30 identifies that the touch object corresponding to the position of the sensing electrode Rxk is a ground conductor.

[0072] S613 : When the capacitance change is less than the preset value, the touch sensing control circuit 30 identifies that the touch object corresponding to the position of the sensing electrode Rxk is a non-ground conductor.

[0073] S614: Locate the two-dimensional position of the ground conductor on the capacitive touch sensing device 1 according to the positions of the sensing electrodes Rxi corresponding to the ground conductor identified at the first time t1 and the second time t2, and the positions of the sensing electrodes Rxk corresponding to the ground conductor identified at the third time t3 and the fourth time t4.

[0074] The above-mentioned touch sensing method provides non-in-phase drive signals to the drive electrodes at one time point in the touch sensing phase T1, and provides in-phase drive signals to each of the drive electrodes at another time point in the touch sensing phase T1. The method compares the degree of change in the sensed capacitance received by the same sensing electrode at the two different times. When the degree of change in the sensed capacitance is small, the method identifies the conductor as a non-grounded conductor, thereby eliminating false sensing caused by the non-grounded conductor. This avoids false sensing by the capacitive touch sensing device 1, thereby improving the touch detection accuracy of the capacitive touch sensing device 1.

[0075] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A capacitive touch sensing device, comprising a touch panel and a touch sensing control circuit; the touch panel comprises a cover plate and a touch electrode layer stacked in sequence from top to bottom; the touch electrode layer is patterned to form a plurality of first electrodes extending along a first direction and a plurality of second electrodes extending along a second direction; the touch sensing control circuit is electrically connected to the first electrodes and the second electrodes; Features: The touch sensing phase includes at least one first moment and at least one second moment; during the first moment and the second moment, the first electrode is used as a driving electrode, and the second electrode is used as a sensing electrode; At the first moment, the touch sensing control circuit provides a first driving signal to a part of the driving electrodes, and provides a second driving signal to another part of the driving electrodes, and receives the sensing capacitance generated by each of the sensing electrodes; wherein the first driving signal and the second driving signal are non-in-phase pulse signals; at the second moment, the touch sensing control circuit provides a third driving signal to each of the driving electrodes, and receives the sensing capacitance generated by each of the sensing electrodes, and the third driving signal received by each of the driving electrodes is an in-phase pulse signal; the touch sensing control circuit further calculates the capacitance change of the sensing capacitance sensed by the same sensing electrode at the first moment and the sensing capacitance sensed by the same sensing electrode at the second moment, and compares it with a preset value; when the capacitance change is greater than or equal to the preset value, the touch sensing control circuit identifies that the touch object at the corresponding position of the sensing electrode is a grounded conductor; when the capacitance change is less than the preset value, the touch sensing control circuit identifies that the touch object at the corresponding position of the sensing electrode is a non-grounded conductor; the non-in-phase pulse signal is a pulse signal with different frequency, amplitude and phase at least; the in-phase pulse signal is a pulse signal with the same frequency, amplitude and phase.

2. The capacitive touch sensing device according to claim 1, It is characterized in that The touch sensing stage also includes at least one third moment and at least one fourth moment; the touch sensing control circuit sequentially passes through the first to the fourth moments; during the third moment and the fourth moment, the first electrode serves as the sensing electrode, and the second electrode serves as the driving electrode; At the third moment, the touch sensing control circuit provides a first driving signal to a portion of the driving electrodes and provides a second driving signal to another portion of the driving electrodes, and receives a sensing capacitance generated by each of the sensing electrodes; At the fourth moment, the touch sensing control circuit provides a third driving signal to each of the driving electrodes; The touch sensing control circuit further calculates the capacitance change of the sensing capacitance sensed by the same sensing electrode at the third moment and the sensing capacitance sensed by the same sensing electrode at the fourth moment and compares the calculation with a preset value; when the capacitance change is greater than or equal to the preset value, the touch sensing control circuit identifies the touch object at the corresponding position of the sensing electrode as a grounded conductor; when the capacitance change is less than the preset value, the touch sensing control circuit identifies the touch object at the corresponding position of the sensing electrode as a non-grounded conductor; The touch sensing control circuit further locates the two-dimensional position of the grounding conductor on the capacitive touch sensing device according to the position of the sensing electrode corresponding to the grounding conductor identified at the first moment and the second moment and the position of the sensing electrode corresponding to the grounding conductor identified at the third moment and the fourth moment.

3. The capacitive touch sensing device according to claim 1, It is characterized in that At the first moment, the touch sensing control circuit provides the first driving signal to odd-numbered electrodes among the driving electrodes, and provides the second driving signal to even-numbered electrodes among the driving electrodes.

4. The capacitive touch sensing device according to claim 1, It is characterized in that At the first moment, the touch sensing control circuit provides the first driving signal to the driving electrode located in the middle of the touch display area; and provides the second driving signal to the driving electrode located at the edge of the touch display area.

5. The capacitive touch sensing device according to claim 1, It is characterized in that At the first moment or the second moment, the touch sensing control circuit receives the sensing capacitance generated by the sensing electrode in a time-sharing manner.

6. A touch sensing method, applied to a capacitive touch sensing device, the capacitive touch sensing device comprising a touch panel and a touch sensing control circuit; the touch panel comprising a cover plate and a touch electrode layer stacked in sequence from top to bottom; the touch electrode layer is patterned to form a plurality of first electrodes extending in a first direction and a plurality of second electrodes extending in a second direction; in, At any time in the touch sensing stage, one of the first electrode and the second electrode is used as a driving electrode, and the other is used as a sensing electrode; The touch sensing control circuit is electrically connected to the first electrode and the second electrode; the touch sensing method includes: Setting the first electrode as the driving electrode and setting the second electrode as the sensing electrode; Provide a first driving signal to a portion of the driving electrodes at a first moment, and provide a second driving signal to another portion of the driving electrodes, and receive a sensing capacitance generated by each of the sensing electrodes; wherein the first driving signal and the second driving signal are non-in-phase pulse signals; providing a third driving signal to each driving electrode at a second moment, and receiving a sensing capacitance generated by each sensing electrode, wherein the third driving signal received by each driving electrode is an in-phase pulse signal; Calculating a capacitance change between the sensing capacitance sensed by the same sensing electrode at the first moment and the sensing capacitance sensed by the same sensing electrode at the second moment; Determining whether the capacitance change is greater than or equal to a preset value; When the capacitance change is less than the preset value, identifying that the touch object corresponding to the sensing electrode position is a non-ground conductor; When the capacitance change is greater than or equal to the preset value, identifying that the touch object corresponding to the sensing electrode position is a ground conductor; The non-in-phase pulse signal is a pulse signal with different frequency, amplitude and phase; the in-phase pulse signal is a pulse signal with the same frequency, amplitude and phase.

7. The touch sensing method according to claim 6, It is characterized in that The touch sensing method further includes: Setting the second electrode as the driving electrode and setting the first electrode as the sensing electrode; At a third moment, the first driving signal is provided to a portion of the driving electrodes, and the second driving signal is provided to another portion of the driving electrodes, and the sensing signal generated by each of the sensing electrodes is received. Allow; providing a third driving signal to each of the driving electrodes at a fourth moment, and receiving a sensing capacitance generated by each of the sensing electrodes; Calculating a capacitance change between the sensing capacitance sensed by the same sensing electrode at the third moment and the sensing capacitance sensed by the same sensing electrode at the fourth moment; Determining whether the capacitance change is greater than or equal to the preset value; When the capacitance change is less than the preset value, identifying that the touch object corresponding to the sensing electrode position is a non-ground conductor; When the capacitance change is greater than or equal to the preset value, identifying that the touch object corresponding to the sensing electrode position is a ground conductor; The two-dimensional position of the ground conductor on the capacitive touch sensing device is located according to the positions of the sensing electrodes corresponding to the ground conductor identified at the first moment and the second moment and the positions of the sensing electrodes corresponding to the ground conductor identified at the third moment and the fourth moment.

8. The touch sensing method according to claim 6, It is characterized in that At the first moment, the first driving signal is provided to odd-numbered electrodes among the driving electrodes, and the second driving signal is provided to even-numbered electrodes among the driving electrodes.

9. The touch sensing method according to claim 6, It is characterized in that At the first moment, the first driving signal and the second driving signal are respectively provided to the driving electrodes located in the middle of the touch display area; the driving electrodes located at the edge of the touch display area do not receive the first driving signal or the second driving signal.

10. The touch sensing method according to claim 6, It is characterized in that At the first moment or the second moment, the touch sensing control circuit receives the sensing capacitance generated by the sensing electrode in a time-sharing manner.

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