TW201519057A - Touch sensor and operating method thereof - Google Patents

Abstract

A touch sensor and an operating method thereof are provided. The touch sensor includes driving lines, sensing lines intersected with the driving lines, a driving unit, a sensing unit, and a demodulating unit. The driving unit drives group driving lines at the same time in driving periods. The driving unit provides different intensity and/or different phase of the driving voltages respectively in each of the driving periods to the driving lines. The sensing unit receives total capacitances of each of the sensing lines. The demodulating unit calculates the capacitance of each of the capacitors based on the total capacitances and the driving voltages. So that, the external noises disperses to many capacitors. Therefore, one capacitor which is interfered by the external noises can be decreased so as to improve the accuracy of the capacitance of each of the capacitors.

Description

Touch sensing device and operating method thereof

The present invention provides a touch sensing device and a method for operating the same, and more particularly to a touch sensing device for improving touch accuracy and a method for operating the same.

In recent years, touch electronic devices have been used by more and more people. The utility model utilizes a touch panel on the electronic device, so that the user can control the electronic device by pressing the touch panel.

Generally, the touch electronic device includes a driving unit, a detecting circuit, a plurality of driving lines, and a plurality of sensing lines. The touch panel of the electronic device is provided with a plurality of driving lines and a plurality of sensing lines respectively disposed at intervals, and a mutual capacitance is disposed at an intersection of each of the driving lines and each of the sensing lines. The driving unit sequentially outputs the driving voltage to the plurality of driving lines, so that the corresponding capacitance generates the induced capacitance. The detection circuit will detect the induced capacitance on each sense line.

When the user presses a touch position of the touch panel, the capacitive capacity of the capacitor corresponding to the touch position will change. At this time, the detecting circuit detects that the sensing capacitance of the capacitor corresponding to the touch position is changed, so as to know the touch position pressed by the user.

However, in addition to detecting the induced capacitance, the detection circuit detects external noise (such as temperature, humidity, electromagnetic interference, static electricity, transformer noise, or display noise), so that the detection circuit detects The signal is unstable, resulting in poor touch performance, so how to improve the detected inductive capacitance and accuracy is very important.

An object of the present invention is to provide a touch sensing device and a method for operating the same, which simultaneously drive a plurality of driving lines through a driving unit in a plurality of driving cycles, and the driving unit respectively provides different intensities and/or different phases in each driving cycle. The driving voltage is to the above plurality of driving lines. The external noise that interferes with the sensing capacitor is dispersed into a plurality of sensing capacitors, thereby reducing the influence of the external signal on a single sensing capacitor, and improving the accuracy of the sensing capacitance of each sensing capacitor.

In one embodiment of the present invention, the touch sensing device includes a plurality of driving lines, a plurality of sensing lines, a driving unit, a sensing unit, and a demodulating unit. A plurality of drive lines are arranged in parallel in sequence. A plurality of drive lines are divided into at least one group. Each group has a plurality of group drive lines formed by dividing a plurality of drive lines. A plurality of sensing lines and a plurality of driving lines are sequentially arranged to cross each other. A sensing capacitor is disposed corresponding to the intersection of each driving line and each sensing line. One end of the sensing capacitor is electrically connected to the corresponding driving line, and the other end of the sensing capacitor is electrically connected to the corresponding sensing line. The driving unit is electrically connected to a plurality of driving lines. The driving unit simultaneously drives a plurality of group driving lines of the same group according to the order of the groups and drives a plurality of driving cycles in the same group. In addition, the driving unit provides driving voltages of different strengths to a plurality of group driving lines in each driving cycle of the same group, and respectively generates inductive capacitances in the corresponding sensing capacitors. The number of the plurality of group drive lines is the same as the number of the plurality of drive cycles. The sensing unit is electrically connected to a plurality of sensing lines. The sensing unit receives the total capacitance of the plurality of inductive capacitances generated by the plurality of sensing capacitors corresponding to each of the sensing lines. The demodulation unit is electrically connected to the sensing unit. The demodulation unit calculates the total capacitance and the driving voltage generated by each driving cycle of the same group sensed by each sensing line to calculate each group driving line of the same group on each sensing line. The inductive capacitance of the corresponding sensing capacitor. When the user presses a touch position of the touch surface of the touch sensing device, the demodulation unit detects that the sensing capacitance of the sensing capacitor corresponding to the touch position changes. So that the demodulation unit knows the user accordingly The touch position of the touch surface is pressed to further control the electronic device.

In one embodiment of the present invention, the touch sensing device includes a plurality of driving lines and a plurality of sensing lines. A plurality of drive lines are arranged in parallel in sequence. A plurality of drive lines are divided into at least one group. Each group has a plurality of group drive lines formed by dividing a plurality of drive lines. A plurality of sensing lines and a plurality of driving lines are sequentially arranged to cross each other. A sensing capacitor is disposed corresponding to an intersection of each driving line and each sensing line. One end of the sensing capacitor is electrically connected to the corresponding driving line. The other end of the sensing capacitor is electrically connected to the corresponding sensing line. The method for improving the touch accuracy of the touch sensing device includes the following steps: step (A) simultaneously driving a plurality of group driving lines of the same group according to the group order and driving the plurality of drivers in the same group The driving voltages of different intensities are respectively supplied to the plurality of group driving lines in each driving cycle of the same group, and the inductive capacitances are respectively generated in the corresponding sensing capacitors. The number of the plurality of group drive lines is the same as the number of the plurality of drive cycles. Step (B) receiving, according to each sensing line, a total of a plurality of inductive capacitances generated by the corresponding plurality of sensing capacitors. Step (C) calculating, according to the driving voltage and the total capacitance of each driving cycle of the same group sensed by each sensing line, respectively corresponding to each group driving line of the same group on each sensing line Inductive capacitance of the sensing capacitor. Step (D) determines whether the inductive capacitance of each of the sensing capacitors is changed, and transmits the touch position corresponding to the sensing capacitor whose inductive capacitance is changed to the back end processing unit for analysis. Therefore, when the user presses a touch position of the touch surface of the touch sensing device, the demodulation unit detects that the induced capacitance of the sensing capacitor corresponding to the touch position changes. The demodulation unit is configured to learn the touch position of the user pressing the touch surface, and transmit the touch position to the back end processing unit for analysis to further control the electronic device.

In order to further understand the features and technical contents of this creation, please refer to the following detailed description and drawings of this creation, but these descriptions and drawings are only used to illustrate this creation, not the right to this creation. The scope is subject to any restrictions.

50‧‧‧Touch surface

100‧‧‧Touch sensing device

110‧‧‧ drive unit

120‧‧‧Sensor unit

122‧‧‧ analog front end components

124‧‧‧ analog digital conversion components

130‧‧‧Demodulation unit

C1-C16‧‧‧Induction Capacitor

C36, C37, C38, C46, C47, C48, C56, C57, C58‧‧‧ induction capacitors

GP1-GP4‧‧‧Group

Rx1-Rx18‧‧‧Sensing line

T1-T4‧‧‧ drive cycle

Tch‧‧‧Touch position

Tx1-Tx16‧‧‧ drive line

Txg1-Txg16‧‧‧ group drive line

V11, V12, V13, V14, V21, V22, V23, V24, V31, V32, V33, V34, V41, V42, V43, V44‧‧‧ drive voltage

S410, S420, S430, S440‧‧ steps

FIG. 1 is a schematic diagram of a touch sensing device according to an embodiment of the invention.

2 is a schematic view of a portion of the touch sensing device of FIG. 1.

3 is a timing diagram of driving a plurality of group driving lines of the same group by a driving unit according to an embodiment of the present invention.

4 is a flow chart of a method for operating a touch sensing device according to an embodiment of the invention.

FIG. 5 is a schematic diagram of a touch surface of a user pressing a touch sensing device according to an embodiment of the invention.

First, please refer to Figure 1. FIG. 1 is a schematic diagram of a touch sensing device according to an embodiment of the invention. As shown in FIG. 1 , the touch sensing device 100 includes driving lines Tx1 - Tx16 , sensing lines Rx1 - Rx18 , a driving unit 110 , a sensing unit 120 , and a demodulating unit 130 . The drive lines Tx1-Tx16 and the sense lines Rx1-Rx18 are disposed on the touch surface 50. When the user presses a certain touch position of the touch surface 50, the demodulation unit 130 can know the touch position of the user pressing the touch surface 50.

The drive lines Tx1-Tx16 are sequentially arranged in parallel and are equally divided into groups GP1-GP4. Each group GP1-GP4 has a plurality of group driving lines formed by dividing the driving lines Tx1-Tx16. Here, the group GP1 corresponds to the group drive line Txg1-Txg4. The group GP2 corresponds to the group drive line Txg5-Txg8. The group GP3 corresponds to the group drive line Txg9-Txg12. The group GP4 corresponds to the group drive line Txg13-Txg16. In this embodiment, there are 16 drive lines, 4 groups in total, and 4 group drive lines. However, in practice, the drive lines, groups, and group drive lines can also be other quantities. For example, there are 30 drive lines, 10 groups, and 3 group drive lines. The number of driving lines, groups, and group driving lines only needs to be divided into a plurality of groups, and each group has a plurality of grouping lines formed by dividing a plurality of driving lines. However, the invention is not limited thereto.

The sensing lines Rx1-Rx18 and the driving lines Tx1-Tx16 are arranged in series. A sensing capacitor (not shown in FIG. 1 ) is disposed corresponding to the intersection of each of the driving lines Tx1 - Tx16 and each of the sensing lines Rx1 - Rx18 . One end of the sensing capacitor is electrically connected to the corresponding driving line, and the other end of the sensing capacitor is electrically connected to the corresponding sensing line. In order to further explain the connection relationship between the sensing line, the driving line, and the sensing capacitance, the following will explain the connection relationship between the driving lines Tx1-Tx16, the sensing line Rx1, and the sensing capacitors C1-C16. As shown in FIG. 2, the intersections of the driving lines Tx1-Tx16 and the sensing lines Rx1 are correspondingly provided with sensing capacitors C1-C16. One ends of the sensing capacitors C1-C16 are electrically connected to the corresponding driving lines Tx1-Tx16, and the other ends of the sensing capacitors C1-C16 are electrically connected to the corresponding sensing lines Rx1. In the present embodiment, the sensing lines Rx1 - Rx18 and the driving lines Tx1 - Tx16 are arranged in a vertical direction. In practice, the sensing lines Rx1-Rx18 and the driving lines Tx1-Tx16 may also be in a cross-setting relationship of other angles. The cross-setting relationship between each of the sensing lines Rx1 - Rx18 and each of the driving lines Tx1 - Tx16 is uniform, and the present invention is not limited thereto. In addition, there are a total of 18 sensing lines in this embodiment. However, in practice, the sensing line can also be other numbers, for example, there are 32 sensing lines, which are not limited by the present invention.

The driving unit 110 is electrically connected to the driving lines Tx1-Tx16, and the sensing unit 120 is electrically connected to the sensing lines Rx1-Rx18. The driving unit 110 simultaneously drives the group driving lines of the same group according to the order of the groups GP1-GP4, that is, the driving unit 110 sequentially drives the group driving lines Txg1-Txg4 of the group GP1 and the group driving of the driving group GP2. Lines Txg5-Txg8, group drive lines Txg9-Txg12 driving group GP3, and group drive lines Txg13-Txg16 driving group GP4, and driving multiple drive cycles in the same group (such as the drive cycle of FIG. 3) T1-T4). The driving unit 110 respectively supplies driving voltages of different strengths to the group driving lines in each driving cycle of the same group (such as the driving voltages V11, V12, V13, V14, V21, V22, V23, V24, V31 of FIG. 3). , V32, V33, V34, V41, V42, V43, V44). In this embodiment, the driving voltage has an intensity voltage value between 5 and 20 volts and a driving period of between 100 and 500 microseconds (μs). In addition, the driving unit 110 is in each driving cycle of the same group. The driving voltages of different phases and the driving voltages of different phases and different phases may be separately provided to the group driving lines (not shown in FIG. 3 ), which is not limited by the present invention. Then, the sensing capacitors corresponding to the group driving lines respectively generate inductive capacitances (such as the sensing capacitors C1-C4 of FIG. 2). Here, the number of group drive lines is the same as the number of drive cycles, and the number of group drive lines Txg1-Txg4 of FIG. 2 and the drive period T1-T4 of FIG. 3 are both four. The driving circuit Tx1-Tx16 is driven by the driving unit 110, so that external noise (such as temperature, humidity, electromagnetic interference, static electricity, etc.) that interferes with the sensing capacitor can be dispersed into a plurality of sensing capacitors, such as external noise dispersed to FIG. The sensing capacitors C1-C4 prevent the external noise from directly affecting a single sensing capacitor, thereby improving the accuracy of the sensing capacitance of each sensing capacitor.

Then, each of the sensing lines Rx1 - Rx18 respectively receives the total capacitance of the plurality of inductive capacitances generated by the corresponding plurality of sensing capacitors, and the sensing lines Rx1 of FIG. 2 are respectively in the driving period T1 - T4 of FIG. 3 . The total capacitance of the induced capacitance generated by the sensing capacitors C1-C16 is added.

In addition, please refer to FIG. 2 at the same time, the sensing unit 120 includes a plurality of analog front end elements (AFEs) and a plurality of analog to digital conversion elements 124 (analog to digital, ADC). Each analog front end component 122 is connected to each of the sensing lines Rx1 - Rx18 to receive a total of a plurality of inductive capacitances generated by the corresponding plurality of inductive capacitors, respectively, and the analog front end component 122 is electrically connected as shown in FIG. 2 . The sensing line Rx1, and the analog front end element 122 respectively receives the total capacitance of the inductive capacitance generated by the sensing capacitors C1-C16 in the driving period T1-T4 of FIG. The plurality of analog front end components 122 are respectively connected to the plurality of analog digital conversion elements 124 to respectively convert the received total capacitance into a digital signal type, and transmit the total capacitance of the digital type to the demodulation unit 130.

The demodulation unit 130 is electrically connected to the sensing unit 120. The demodulation unit 130 calculates the total capacitance and the driving voltage generated for each driving cycle of the same group sensed according to each sensing line to calculate each group of the same group on each sensing line. The induced capacitance of the sensing capacitor corresponding to the group driving line, as shown in the demodulation list of FIG. The element 130 calculates the induced capacitance of the sensing capacitors C1-C4 corresponding to the group driving lines Txg1-Txg4 of the group GP1 on the sensing line Rx1. Therefore, when a user presses a touch position of the touch surface, the demodulation unit 130 detects that the induced capacitance of the sensing capacitor corresponding to the touch position changes and the other position corresponding to the touch surface The inductive capacitance of the capacitor does not change. The demodulation unit 130 can be made aware of the touch position of the user pressing the touch surface.

Next, please refer to Figure 4 at the same time. 4 is a flow chart of a method for operating a touch sensing device according to an embodiment of the invention. First, the driving unit 110 simultaneously drives a plurality of group driving lines of the same group according to the order of the groups GP1-GP4, that is, the driving unit 110 sequentially drives the group driving lines Txg1-Txg4 and the driving group GP2 of the group GP1. The group drive lines Txg5-Txg8, the group drive lines Txg9-Txg12 of the drive group GP3, and the group drive lines Txg13-Txg16 of the drive group GP4. And the driving unit 110 drives a plurality of driving cycles in the same group, for example, the driving unit 110 drives the four driving periods T1-T4 of FIG. 3 in the group GP1. And the driving unit 110 respectively supplies driving voltages of different strengths to a plurality of group driving lines in each driving cycle of the same group. For example, the driving unit 110 provides the driving voltages V11, V12, V13, and V14 of FIG. 3 to the group driving lines Txg1-Txg4 and the driving period T2 of the group GP1 to respectively provide the driving voltage of FIG. 3 in the driving period T1 of the group GP1. V21, V22, V23, V24 to the group drive line Txg1-Txg4, and the driving period T3 of the group GP1 respectively provide the driving voltages V31, V32, V33, V34 of FIG. 3 to the group driving lines Txg1-Txg4, and the group The driving period T4 of the group GP1 provides the driving voltages V41, V42, V43, and V44 of FIG. 3 to the group driving lines Txg1-Txg4, respectively. The number of the plurality of group driving lines is the same as the number of the plurality of driving cycles, and the number of the group driving lines Txg1-Txg4 of FIG. 2 and the driving period T1-T4 of FIG. 3 are both 4, respectively, and corresponding to the sensing The capacitor generates an induced capacitance (step S410). The driving circuit 110 drives the driving lines Tx1-Tx16. The external noise that interferes with the sensing capacitor is dispersed into a plurality of sensing capacitors (for example, the external noise is dispersed to the sensing capacitors C1-C4 of FIG. 2) to avoid external noise. Direct influence The sensing capacitance, in turn, increases the accuracy of the inductive capacitance of each of the sensing capacitors.

Next, each sensing line 遂 receives the total capacitance of the induced capacitance generated by the corresponding plurality of sensing capacitors. The sensing lines Rx1 - Rx18 of FIG. 1 receive the total capacitance of the induced capacitance generated by the corresponding plurality of sensing capacitors in each driving cycle. Each sense line then filters out the total capacitance noise and converts the total capacitance into a digital signal pattern to transfer the digital type of total capacitance to the demodulation unit 130 for further analysis (step S420).

Then, the demodulation unit 130 respectively calculates each group drive of the same group on each sensing line according to the driving voltage and the total capacitance of each driving cycle of the same group sensed by each sensing line. The inductive capacitance of the sense capacitor corresponding to the line (step S430). For example, the demodulation unit 130 drives the voltages V11, V12, V13, V14, V21, V22, V23, V24, V31, V32, V33, V34, V41, V42, V43, V44 and the sensing according to the driving period T1-T4 of FIG. The capacitances C1-C4 are summed to the total capacitance of the induced capacitances generated during the driving periods T1-T4, respectively, and the inductive capacitances of the sensing capacitors C1-C4 are calculated.

Here, the demodulation unit 130 calculates the inductive capacitance of the sensing capacitor corresponding to each group driving line of the same group on each sensing line by Cramer's Rule. The Kramer expression is as follows:

Wherein, S _{T 1} ... S _Tn are the total capacitance generated by the same group of sensing capacitors sensed by the same sensing line in each driving cycle, and the sensing capacitance of group GP1 is sensed by the sensing line Rx1 of FIG. 2 The total capacitance generated by C1-C4 in the driving period T1-T4 of FIG. [ V ₁₁ ~ V _{1 n} ], [ V ₂₁ ~ V _{2 n} ]...[ V _{n 1} ~ V _nn ] are driving units 110 respectively supplied to a plurality of group driving lines in each driving cycle of the same group Drive voltage. The driving unit 110 of FIG. 2 respectively supplies driving voltages V11, V12, V13, and V14 of different intensities to the group driving lines Txg1 - Txg4 in the driving period T1 of the group GP1, respectively, in the driving period T2 of the group GP1. Driving voltages V21, V22, V23, and V24 of different intensities to the group driving lines Txg1-Txg4, and driving voltages V31, V32, V33, and V34 of different intensities to the group driving line Txg1 are respectively provided in the driving period T3 of the group GP1. -Txg4, and drive voltages V41, V42, V43, V44 of different intensities are respectively supplied to the group drive lines Txg1-Txg4 in the drive period T4 of the group GP1. C ₁ ... C _n are the sensing capacitances of the plurality of group driving lines of the same group sensed by the same sensing line, and the sensing line Rx1 of FIG. 2 senses the sensing power of the sensing capacitors C1-C4 of the group GP1. capacity.

Further, in the present embodiment, the driving voltage is composed of a plurality of identical pulse voltages, and the driving voltage of the group driving line Txg1 of the driving period T1 of FIG. 3 is composed of four pulse voltages. Therefore, each sensing line can select a preferred pulse voltage as the driving voltage among the plurality of pulse voltages. For example, the sensing line Rx1 selects the second pulse voltage as the driving voltage of the driving period T1 in the driving period T1 of FIG. 3, It is provided to the demodulation unit 130 for analysis. Again or each sense line will be able to sense a sum of multiple capacitances in the same drive cycle, and then demodulation unit 130 averages the sum of the multiple capacitances to produce the total capacitance. If the sensing line Rx1 senses the sum of 4 capacitances in the driving period T1 of FIG. 3, then the demodulating unit 130 averages the sum of 4 capacitances to generate the total capacitance. Therefore, the driving voltage is composed of a plurality of identical pulse voltages, which can further reduce the problem that the driving unit 110 provides an unstable driving voltage, so that the demodulating unit 130 can obtain a more accurate total capacitance. Of course, the driving voltage may also be composed of a pulse voltage or continuously output the driving voltage, which is not limited in the present invention. In addition, the pulse voltage of this embodiment may be a square wave, a sine wave, a triangular wave, or other types of waveforms, and the present invention is not limited thereto.

After the step S430, the demodulation unit 130 can further detect whether the inductive capacitance of each of the sensing capacitors disposed on the driving lines Tx1-Tx16 and the sensing lines Rx1-Rx18 is changed, and the sensing capacitance is changed. The touch position corresponding to the capacitor is transmitted to the back end processing unit (not shown) for analysis (step S440). because Therefore, when a user presses a touch position of the touch surface, the demodulation unit 130 detects that the induced capacitance of the sensing capacitor corresponding to the touch position is changed and the other positions of the touch surface correspond to the sensing. The inductive capacitance of the capacitor is unchanged, and then the demodulation unit 130 transmits the touch position to the back end processing unit for further analysis, so that the back end processing unit can know the touch position of the user pressing the touch surface, and further control The electronic device at the end.

To further illustrate that the driving unit 110 drives the driving lines Tx1-Tx16, the sensing unit 120 senses the total capacitance received by each of the sensing lines Rx1-Rx18 in each driving period, and the demodulating unit 130 calculates each of the sensing capacitors. The case of inductive capacitance. Referring to FIG. 2 and FIG. 3 simultaneously, the driving unit 110 drives the group driving lines Txg1-Txg4 of the group GP1 at the same time, and the driving unit 110 outputs driving of different strengths in the driving periods T1-T4 of the group GP1. Voltages V11, V12, V13, V14, V21, V22, V23, V24, V31, V32, V33, V34, V41, V42, V43, V44 to the drive line Tx1-Tx4, and the sense line Rx1 are in the drive period T1-T4, respectively The total capacitance of the induced capacitances corresponding to the induced capacitances C1-C4 is received, and the demodulation unit 130 calculates the induced capacitances of the sensing capacitors C1-C4, respectively.

Please refer to Figure 2 and Figure 3 at the same time. The drive unit 110 simultaneously drives the group drive lines Txg1-Txg4 in the group GP1. Since the group driving lines of the embodiment are four, the driving period will be set to four time periods, that is, the driving period of FIG. 3 is T1-T4. Next, the driving unit 110 drives the group driving lines Txg1-Txg4 of the group GP1 for four driving periods T1-T4, and each driving period provides driving voltages of different strengths to the group driving lines Txg1-Txg4, as shown in the figure. 3 is shown. That is, the driving unit 110 outputs the driving voltages V11, V12, V13, and V14 to the group driving lines Txg1-Txg4 in the driving period T1, and outputs the driving voltages V21, V22, V23, and V24 to the group in the driving period T2, respectively. The driving lines Txg1-Txg4 respectively output driving voltages V31, V32, V33, and V34 to the group driving lines Txg1-Txg4 in the driving period T3, and respectively output driving voltages in the driving period T4. V41, V42, V43, V44 to the group drive line Txg1-Txg4.

The sensing capacitors C1-C4 will also generate inductive capacitances in the four drive periods T1-T4, respectively. At this time, the sensing line Rx1 will receive the total capacitances S _T1 , S _T2 , S _T3 , and S _T4 corresponding to the induced capacitances generated by the sensing capacitors C1 - C16 of each driving cycle. At this time, since the driving unit 110 does not output the driving voltage to each group driving line of the group GP2-GP4, the sensing capacitance C5-C16 does not generate the sensing capacitance, so the total capacitance at this time is the sensing capacitance C1-C4. Corresponding to the sum of the induced capacitances produced. That is, when the driving period T1 is driven, the total capacitance S _T1 received by the sensing line Rx1 is V11×C1+V12×C2+V13×C3+V14×C4. At the driving period T2, the total capacitance S _T2 received by the sensing line Rx1 is V21 × C1 + V22 × C2 + V23 × C3 + V24 × C4. At the driving period T3, the total capacitance S _T3 received by the sensing line Rx1 is V31 × C1 + V32 × C2 + V33 × C3 + V34 × C4. At the driving period T4, the total capacitance S _T4 received by the sensing line Rx1 is V41 × C1 + V42 × C2 + V43 × C3 + V44 × C4.

The total capacitance S _T1 , S _T2 , S _T3 , and S _T4 are sorted to obtain the Kramer algorithm as follows:

Then, the demodulation unit 130 calculates the induced capacitance of the sensing capacitor C1-C4 on the sensing line Rx1 according to the above-described Kramer expression, that is, C1 is calculated by det(V1)/det(V), C2 Calculated by det(V2)/det(V), C3 is calculated by det(V3)/det(V), and C4 is calculated by det(V4)/det(V). In the same driving period T1-T4, the demodulating unit 130 calculates the inductive capacitance of the sensing capacitor corresponding to the group driving lines Txg1-Txg4 of the group GP1 in the same manner in the same manner. After the demodulation unit 130 is subjected to the driving period T1-T4 (ie, the first to fourth driving periods), the group can be calculated. The inductive capacitance of each of the sensing capacitors at the intersection of the group drive lines Txg1-Txg4 and the sense lines Rx1-Rx18.

Similarly, after the demodulation unit 130 passes through four driving cycles (ie, the fifth to eighth driving cycles), the sensing capacitance of the intersection of the group driving lines Txg5-Txg8 and the sensing lines Rx1-Rx18 can be calculated. capacitance. The demodulation unit 130 can also obtain the induced capacitance of the sensing capacitance at the intersection of the group driving lines Txg9-Txg12 and the sensing lines Rx1-Rx18 after the 9th-12th driving period, and the demodulating unit 130 at the 13th After 16 driving cycles, the inductive capacitance of the sensing capacitance at the intersection of the group driving lines Txg13-Txg16 and the sensing lines Rx1-Rx18 is obtained. Therefore, as described above, the demodulation unit 130 of the present embodiment can obtain the inductive capacitance of each of the sensing capacitors disposed on the driving lines Tx1 - Tx16 and the sensing lines Rx1 - Rx18 after 16 driving cycles.

Referring to FIG. 5 at the same time, when the user presses the touch position Tch of the touch surface 50 with a finger, the sensing capacitors C36, C37, C38, C46, C47 at the intersection of the driving lines TX3-Tx5 and the sensing lines Rx6-Rx8. The inductive capacitance of C48, C56, C57, and C58 changes due to the finger touching the touch position Tch. In the present embodiment, the induced capacitance is increased by the finger touching the touch position Tch. At this time, the demodulation unit 130 will calculate the induced capacitance of each of the sensing capacitors, and know the inductive capacitance of the sensing capacitors C36, C37, C38, C46, C47, C48, C56, C57, C58 on the touch position Tch. There is a change, and the inductive capacitance of the sensing capacitor other than the touch position Tch is unchanged. Then, the demodulation unit 130 transmits the touch position Tch to the back-end processing unit (such as a micro-controller (MCU) in the mobile phone) for analysis, so that the back-end processing unit can learn that the user presses the touch The touch position Tch of the surface 50 is touched, and the electronic device (such as a mobile phone) at the rear end is further controlled.

In summary, the touch sensing device and the method for operating the same according to the embodiments of the present invention drive a plurality of driving lines simultaneously through the driving unit 110 in multiple driving cycles, and the driving unit 110 respectively provides each driving cycle. Driving voltages of different intensities and/or different phases are applied to the plurality of driving lines. External noise that interferes with the sensing capacitor Disperse into multiple sensing capacitors, which reduces the influence of external signals on a single sensing capacitor, and improves the accuracy of the sensing capacitance of each sensing capacitor.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

50‧‧‧Touch surface

100‧‧‧Touch sensing device

110‧‧‧ drive unit

120‧‧‧Sensor unit

130‧‧‧Demodulation unit

GP1-GP4‧‧‧Group

Rx1-Rx18‧‧‧Sensing line

Tx1-Tx16‧‧‧ drive line

Txg1-Txg16‧‧‧ group drive line

Claims (12)

A touch sensing device includes: a plurality of driving lines arranged in parallel, the driving lines are divided into at least one group, and each group has a plurality of group driving lines formed by dividing the driving lines a plurality of sensing lines are disposed in sequence with the driving lines, and a sensing capacitor is disposed corresponding to an intersection of each of the driving lines and each of the sensing lines, and one end of the sensing capacitor is electrically connected to the corresponding driving line, The other end of the sensing capacitor is electrically connected to the corresponding sensing line; a driving unit is electrically connected to the driving lines, and the driving unit simultaneously drives the group driving lines of the same group according to the order of the groups. Driving a plurality of driving cycles in a group, and the driving unit respectively provides driving voltages of different intensities to the group driving lines in each driving cycle of the same group, wherein the number of the group driving lines The sensing unit is electrically connected to the sensing lines, and the sensing unit receives the senses generated by the sensing capacitors corresponding to each of the sensing lines. a total capacitance after summing the capacitance; and a demodulation unit electrically connected to the sensing unit, the demodulation unit generating the generated according to each driving period of the same group sensed by each sensing line The total capacitance and the driving voltage are respectively calculated to calculate the inductive capacitance of the sensing capacitor corresponding to each group driving line of the same group on each sensing line. The touch sensing device of claim 1, wherein the demodulation unit calculates the inductive capacitance of each of the sensing capacitors on each of the sensing lines by a Cramer's Rule, the carat The Ma expression is: Wherein, S _{T 1} ... S _Tn are the total capacitance generated by the sensing capacitors of the same group sensed by the same sensing line in each driving cycle, [ V ₁₁ ~ V _{1 n} ], [ V ₂₁ ~ V _{2 n} ]...[ Vn ₁ ~ V _nn ] for each driving cycle of the same group, the driving unit respectively supplies the driving voltage to the group driving lines, C ₁ ... C _n are the same The inductive capacitance of the group drive lines of the same group sensed by one sense line. The touch sensing device of claim 1, wherein the driving voltage is composed of the same plurality of pulse voltages in each driving cycle. The touch sensing device of claim 1, wherein the driving unit simultaneously drives the group driving lines of the same group according to the order of the groups and drives the plurality of driving cycles in the same group. And the driving unit respectively supplies the driving voltages of different phases to the group driving lines in each driving cycle of the same group. The touch sensing device of claim 1, wherein the sensing unit comprises a plurality of analog front end (AFE) and a plurality of analog to digital (ADC), each analogy The front end component is connected to the sensing line to receive the total capacitance respectively, and each analog front end component is connected to the analog digital conversion component to convert the total capacitance into a digital signal type and transmit the digital signal type. The total capacitance is to the demodulation unit. The touch sensing device of claim 1, wherein the driving lines and the sensing lines are disposed on a touch surface, and when a user touches a touch position of the touch surface, the The demodulation unit detects that the inductive capacitance of the sensing capacitor corresponding to the touch position changes, and transmits the touch position to a back end processing unit for analysis. A method for operating a touch sensing device, the touch sensing device comprising a plurality of drives a moving line and a plurality of sensing lines, wherein the driving lines are sequentially arranged in parallel, and the driving lines are divided into at least one group, and each group has a plurality of group driving lines formed by dividing the driving lines. The sensing lines and the driving lines are arranged in series, and a sensing capacitor is disposed corresponding to an intersection of each of the driving lines and each of the sensing lines, and one end of the sensing capacitor is electrically connected to the corresponding driving line, and the sensing capacitor is The other end electrically connects the corresponding sensing line, comprising the steps of: driving the group driving lines of the same group at the same time according to the order of the groups, and driving the plurality of driving cycles in the same group, and A driving voltage of different strengths is respectively supplied to the group driving lines in each driving period of a group, wherein the number of the group driving lines is the same as the number of the driving periods, and respectively corresponding to the sensing The capacitor generates an inductive capacitance; and each of the sensing lines receives the total capacitance of the inductive capacitances generated by the corresponding sensing capacitors; and according to each Calculating the driving voltage and the total capacitance of each driving cycle of the same group sensed by the line, respectively calculating the sensing capacitance corresponding to each group driving line of the same group on each sensing line The induced capacitance. The method of claim 7, wherein calculating the inductive capacitance of each of the sensing capacitors on each of the sensing lines is calculated by a Cramer's Rule, which is : Wherein, S _{T 1} ... S _Tn are the total capacitance generated by the sensing capacitors of the same group sensed by the same sensing line in each driving cycle, [ V ₁₁ ~ V _{1 n} ], [ V ₂₁ ~ V _{2 n} ]...[ V _{n 1} ~ V _nn ] is the driving voltage supplied to the group driving lines in each driving cycle of the same group, and C ₁ ... C _n are the same sense The inductive capacitance of the group drive lines of the same group sensed by the line. The method of claim 7, wherein the driving voltage is composed of the same plurality of pulse voltages in each driving cycle. The method of claim 7, wherein the driving voltages of different phases are respectively supplied to the group driving lines in each driving cycle of the same group. The method of claim 7, wherein after each of the sensing lines receives the total capacitance, the method further comprises the step of: converting the total capacitance into a digital signal pattern. The method of claim 7, wherein after calculating the inductive capacitance of each of the sensing capacitors on each of the sensing lines, further comprising the step of: determining whether the inductive capacitance of each of the sensing capacitors has changed, And transmitting a touch position corresponding to the sensing capacitor whose inductive capacitance is changed to a back end processing unit for analysis.