CN107102758B - Scanning method and compensation method of touch panel - Google Patents
Scanning method and compensation method of touch panel Download PDFInfo
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- CN107102758B CN107102758B CN201610892844.0A CN201610892844A CN107102758B CN 107102758 B CN107102758 B CN 107102758B CN 201610892844 A CN201610892844 A CN 201610892844A CN 107102758 B CN107102758 B CN 107102758B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
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Abstract
The invention provides a scanning method and a compensation method of a touch panel, which are used for defining a matrix with an inverse matrix and dividing the touch panel into a plurality of scanning areas according to the defined matrix. By inputting an input signal including the defined matrix into each scanning area, output signals or compensation signals corresponding to different scanning areas are obtained. The scanning method and the compensation method provided by the invention can reduce the setting cost of the circuit, effectively know the position of the touch point and more effectively compensate the initial capacitance value or the voltage value of the touch panel.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to a scanning method and a compensation method for a touch panel, and more particularly, to a scanning method and a compensation method for a projection type touch panel.
[ background of the invention ]
The conventional Mutual Capacitance (Mutual Capacitance) scanning method for a projection touch panel uses a matrix signal as an input signal, wherein the order number of the selected matrix must be greater than or equal to the number of driving electrodes of the touch panel. When the number of the matrix is equal to the number of the driving electrodes of the touch panel, the scanning efficiency is optimal. However, considering the cost of IC placement, only a single set of matrices is typically built into the circuit. In addition, in order to make the selected matrix suitable for touch panels with different sizes, the matrix with a larger order is generally selected, so that the number of the driving electrodes of the touch panel is smaller than the order of the matrix.
Fig. 1 is a schematic diagram of a touch panel with a matrix set in the prior art. As shown in the figure, although the number of the selected matrices with larger orders is larger than that of the touch panel, and the number of the selected matrices is larger than that of the driving electrodes 111 of the touch panel 11, when the order of the matrix 12 is larger than that of the driving electrodes 111 of the touch panel 11, the matrix order 121 that is added is still inputted to the touch panel 11 as a part of the input signal, that is, the matrix order that is added still occupies the scanning time and causes the waste of time.
Therefore, the conventional mutual capacitance scanning method is not an economical method for the touch panel with a small number of electrodes, because the scanning time is fixed as long as the order of the matrix is fixed regardless of the number of electrodes of the touch panel.
[ summary of the invention ]
An objective of the present invention is to provide a scanning method for a touch panel, which mainly divides the touch panel into a plurality of scanning areas according to a defined matrix, wherein the defined matrix has an inverse matrix. During scanning, the input signals including the defined matrix can be respectively input into each scanning area to obtain a plurality of output signals, and the positions of the touch points can be obtained by analyzing the output signals. The scanning method of the invention can not only reduce the setting cost of the circuit, but also can effectively know the position of the touch point.
Another objective of the present invention is to provide another scanning method for a touch panel, which divides the touch panel into a plurality of scanning areas according to a defined matrix, wherein the defined matrix has an inverse matrix. When the touch control device is used, a first input signal can be respectively input into different scanning areas to generate a corresponding first output signal, and the scanning area where the touch control point is located is known through the first output signal. Then, a second output signal including the defined matrix is input into the scanning area where the touch point is located to obtain a corresponding second output signal, and the position of the touch point is known through the second output signal.
Another objective of the present invention is to provide a compensation method for a touch panel, which divides the touch panel into a plurality of scanning areas by a defined matrix, wherein the defined matrix has an inverse matrix. Then, the input signals including the defined matrix are respectively input into the scanning area to obtain a plurality of output signals. By analyzing the output signals, compensation signals corresponding to the output signals can be input, so that the difference of initial voltage or capacitance values of different areas of the touch panel can be reduced.
Another objective of the present invention is to provide another compensation method for a touch panel, which can effectively compensate the initial voltage or capacitance of the touch panel without an additional compensation circuit. The method includes inputting an input signal to at least one first electrode of the touch panel to generate a corresponding output signal, and inputting one or more compensation signals to one or more first electrodes of the touch panel, which are not inputted with the input signal, by analyzing the output signal, so as to reduce the initial voltage or capacitance difference in different areas of the touch panel.
To achieve the above object, the present invention provides a scanning method of a touch panel, wherein the touch panel includes a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are interlaced with each other, the scanning method includes the following steps: defining a matrix, wherein the matrix has an inverse matrix; dividing the touch panel into a plurality of scanning areas along the direction of the first electrodes according to the order of the matrix, wherein each scanning area comprises a plurality of first electrodes; inputting an input signal into a plurality of scanning areas respectively, wherein the input signal comprises a matrix; and each scanning area respectively generates a plurality of output signals corresponding to different second electrodes and respectively transmits the plurality of output signals to the corresponding second electrodes.
To achieve the above object, the present invention provides a scanning method, in which a touch panel includes a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are interlaced with each other, the scanning method including the steps of: defining a matrix, wherein the matrix has an inverse matrix; dividing the touch panel into a plurality of scanning areas along the direction of the first electrodes according to the order of the matrix, wherein each scanning area comprises a plurality of first electrodes; respectively inputting a first input signal into a plurality of first electrodes, forming at least one touch point on at least one scanning area, and generating at least one corresponding touch signal; mixing the touch signal on at least one first electrode with the first input signal to generate at least one first output signal; obtaining a scanning area forming a touch point according to the first output signal; inputting a second input signal into a scanning area forming a touch point, wherein the second input signal comprises a matrix; mixing a second input signal and a touch signal of a scanning area forming a touch point to generate at least one second output signal; and transmitting the second output signal to the corresponding second electrode.
To achieve the above object, the present invention provides a compensation method for a touch panel, wherein the touch panel comprises a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are interlaced with each other, the compensation method comprising the steps of: defining a matrix, wherein the matrix has an inverse matrix; dividing the touch panel into a plurality of scanning areas along the direction of the first electrodes according to the order of the matrix, wherein each scanning area comprises a plurality of first electrodes; respectively inputting an input signal into a plurality of scanning areas and generating a plurality of output signals respectively corresponding to different scanning areas and different second electrodes, wherein the input signal comprises a matrix; and generating a plurality of compensation signals according to the plurality of output signals, wherein the compensation signals correspond to the plurality of output signals respectively.
To achieve the above object, the present invention provides a compensation method for a touch panel, wherein the touch panel comprises a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are interlaced with each other, the compensation method comprising the steps of: inputting an input signal into at least one first electrode; generating one or more output signals, wherein the output signals correspond to the first electrodes; analyzing the output signal to generate one or more compensation signals; and one or more compensation signals are input into one or more first electrodes of the rest of the input signals.
In the scanning method according to an embodiment of the present invention, the method further includes the following steps: forming at least one touch point on at least one scanning area and generating at least one corresponding touch signal; mixing the touch signal and the input signal on at least one scanning area to generate at least one output signal; transmitting the output signal to the corresponding second electrode; and analyzing the output signal received by the second electrode to obtain the position of the touch point.
In the scanning method according to an embodiment of the present invention, the matrix is a hadamard matrix, a nonsingular square matrix, or a reversible square matrix.
In the scanning method according to an embodiment of the invention, the number of the first electrodes in the scanning area is equal to the number of orders of the matrix.
In the scanning method according to an embodiment of the invention, the number of orders of the matrix is smaller than the number of first electrodes of the touch panel.
In the scanning method according to an embodiment of the present invention, when the number of the first electrodes is not a multiple of the order of the matrix, two adjacent scanning regions include the shared first electrode.
In the scanning method according to an embodiment of the present invention, the method further includes the following steps: and analyzing a second output signal received by the second electrode to obtain the position of the touch point.
In the scanning method according to an embodiment of the present invention, the method further includes the following steps: the first output signal is transmitted to the first electrode, and the scanning area forming the touch point is obtained according to the first output signal.
In the compensation method according to an embodiment of the present invention, the number of the compensation signals is the number of the scanning areas multiplied by the number of the second electrodes.
In the compensation method according to an embodiment of the present invention, a sum of the compensation signal and the corresponding output signal is zero.
In the compensation method according to an embodiment of the present invention, the method further includes the following steps: the compensation circuit is electrically connected to the touch panel.
In the compensation method according to an embodiment of the present invention, the input signal includes a matrix, wherein the matrix has an inverse matrix, and the number of the first electrodes inputted by the input signal is equal to the order of the matrix.
In the compensation method according to an embodiment of the present invention, the matrix is a hadamard matrix, a nonsingular square matrix, or a reversible square matrix.
In the compensation method according to an embodiment of the present invention, a sum of the compensation signal and the corresponding output signal is zero.
In the compensation method according to an embodiment of the present invention, the method further includes the following steps: the output signals are plural and respectively correspond to different second electrodes, wherein the output signals are respectively transmitted to the corresponding second electrodes.
[ description of the drawings ]
Fig. 1 is a schematic diagram illustrating a matrix set applied to a touch panel in the prior art.
Fig. 2 is a schematic diagram of an equivalent circuit of a touch panel according to an embodiment of the invention.
Fig. 3A to 3B are schematic diagrams illustrating self-contained scanning signal transmission of a touch panel according to an embodiment of the invention.
Fig. 4 is a schematic diagram illustrating transmission of mutual capacitance scanning signals of a touch panel according to an embodiment of the invention.
Fig. 5 is a flowchart illustrating a scanning method of a touch panel according to a first embodiment of the invention.
Fig. 6 is a schematic diagram of a hadamard matrix according to an embodiment of the invention.
Fig. 7 is a schematic view of a scanning area of a touch panel according to an embodiment of the invention.
FIG. 8 is a schematic diagram of a matrix according to an embodiment of the invention.
Fig. 9 is a flowchart illustrating a scanning method of a touch panel according to a second embodiment of the invention.
Fig. 10 is a schematic view of a scanning area of a touch panel according to another embodiment of the invention.
Fig. 11 is a flowchart illustrating a compensation method of a touch panel according to a first embodiment of the invention.
Fig. 12 is a flowchart illustrating a compensation method for a touch panel according to a second embodiment of the present invention.
[ main assembly symbol description ]:
11 touch panel 111 drive electrode
111 induction electrode 12 hadamard matrix
Matrix order 21 scanning area with more 121
211 first scanning area 212 second scanning area
213 third scanning zone 214 fourth scanning zone
215 fifth scanning zone 216 sixth scanning zone
217 seventh scan area 2175 overlap scan area
218 eighth scanning area 23 touch control point
[ detailed description ] embodiments
Fig. 2 is a schematic diagram of an equivalent circuit of a touch panel according to an embodiment of the invention. As shown in the figure, the touch panel includes a plurality of first electrodes Tx and a plurality of second electrodes Rx, and the first electrodes Rx and the second electrodes Ry are interlaced with each other. Each first electrode Tx and each second electrode Ry can be equivalent to a plurality of resistors connected in series, and an equivalent capacitance Cm is generated at the intersection of each first electrode Tx and each second electrode Ry.
When a conductive object, such as a finger, touches the touch panel, at least one touch point is formed on the touch panel, and a touch capacitor is formed between the touch panel and the conductive object, so that the capacitance of one or more capacitors Cm in the area where the touch point is located is changed by the touch capacitor. Therefore, the position of the touch panel touched by the finger can be obtained by detecting the capacitance or voltage change of each capacitor Cm of the touch panel.
Please refer to fig. 3A and fig. 3B, which are schematic diagrams illustrating self-contained scanning signal transmission of a touch panel according to an embodiment of the invention. Fig. 4 is a schematic diagram of mutual capacitance scanning signal transmission of the touch panel according to an embodiment of the present invention. As shown in the figure, the scanning method of the touch panel can be generally divided into Self Capacitance (Self Capacitance) and mutual Capacitance (mutual Capacitance).
In the self-capacitance scanning, an input signal is respectively input to each first electrode Tx, and then the returned sensing signal is respectively received by each first electrode Tx, so as to detect the change of the overall capacitance value of each first electrode Tx, and obtain the corresponding first electrode Tx of the touch point 23, as shown in fig. 3A. In addition, the self-contained scanning can also input an input signal to each second electrode Ry, and then receive the returned sensing signal through each second electrode Ry, so as to detect the change of the overall capacitance value of each second electrode Ry, and obtain the corresponding second electrode Ry of the touch point 23, as shown in fig. 3B. By obtaining the information of the first electrode Tx and the second electrode Ry corresponding to the touch point 23, the position of the touch point 23 can be obtained.
The mutual capacitance scanning is to input an input signal to each first electrode Tx, and then receive a sensing signal through each second electrode Rx to detect a capacitance change at an intersection of each first electrode Tx and each second electrode Ry, so as to obtain the position of the touch point 23, as shown in fig. 4.
Please refer to fig. 5, which is a flowchart illustrating a scanning method of a touch panel according to a first embodiment of the present invention. As shown, a matrix is first defined, wherein the defined matrix has an inverse matrix, as shown in step S301. In other words, the matrix defined in step S301 is a non-singular square matrix or a reversible square matrix. According to the number of the matrix, the touch panel is divided into a plurality of scanning areas along the direction of the first electrodes Tx, wherein each scanning area includes a plurality of first electrodes Tx and a part of the plurality of second electrodes Ry, for example, a part of each second electrode Ry, as shown in step S303.
In an embodiment of the invention, the order of the matrix is smaller than the number of the first electrodes Tx of the touch panel.
In a preferred embodiment of the present invention, the defined Matrix is a Hadamard Matrix (Hadamard Matrix).
Please refer to fig. 6 and fig. 7, which are a schematic diagram of a hadamard matrix according to an embodiment of the invention and a schematic diagram of a scanning area of a touch panel according to an embodiment of the invention. In an embodiment of the present invention, the defined matrix is a hadamard matrix, and the number of the first electrodes Tx of each scanning area 21 is equal to the order of the hadamard matrix. Hereinafter, an 8-step hadamard matrix and a touch panel including 60 first electrodes Tx and 36 second electrodes Ry will be described. The 8-step hadamard matrix divides the touch panel into eight scan areas, such as a first scan area 211, a second scan area 212, a third scan area 213, a fourth scan area 214, a fifth scan area 215, a sixth scan area 216, a seventh scan area 217, and an eighth scan area 218, wherein each scan area 21 includes 8 first electrodes Tx.
Since in the present embodiment the number of first electrodes Tx is not an integer multiple of the order of the selected matrix, for example 60 first electrodes Tx is not an integer multiple of 8. In order to make each scanning area 21 include 8 first electrodes Tx, two adjacent scanning areas 21 may overlap, for example, the seventh scanning area 217 and the eighth scanning area 218 include overlapping scanning areas 2175, in other words, the seventh scanning area 217 and the eighth scanning area 218 include overlapping first electrodes Tx.
The numbers of the hadamard matrix in fig. 6 and the first electrodes Tx and the second electrodes Ry in fig. 7 are only for convenience of describing the scanning method of the embodiment of the invention, and the embodiment is given by way of example and is not intended to limit the scope of the invention. In other embodiments of the present invention, any other matrix with inverse matrix may be used, and the hadamard matrix is not necessarily used, and the defined matrix may have other orders, such as 4 th order or 16 th order. In other embodiments of the present invention, the number of the first electrodes Tx and the second electrodes Ry may also be other numbers, for example, the number of the first electrodes Tx is 30, and the number of the second electrodes Ry is 18.
After the touch panel is divided into a plurality of scanning areas 21, an input signal is respectively inputted into each scanning area 21, wherein the input signal includes the matrix defined in step S301, as shown in step S305.
When the output signals of the present invention can be output in the form of voltages, for example, when the input signals include 8-level hadamard matrices, the values in the X1 th to X8 th rows of the matrix respectively correspond to the 8 first electrodes Tx of each scan area 21, and the values in the X1 th to X8 th rows are respectively input to the 8 first electrodes Tx, and the D1 th to D8 th rows of the matrix represent the input values at different time points, as shown in fig. 6.
In an embodiment of the invention, referring to fig. 2, the output voltage VoRy1 received by the first second electrode Ry1 of the first scanning region 211 at the first time point D1 can be calculated by the following formula (1):
VoRy1＝s Vi×[A11×Cmx1y1×F(RCx1y1)+A21×Cmx2y1×F(RCx2y1)
+…+A81×Cmx8y1×F(RCx8y1)]………(1)
where s is 2 pi times the frequency and Vi is the input voltage. Referring to fig. 8, which is a schematic diagram of a matrix according to an embodiment of the invention, and referring to fig. 2, Ann in the calculation formula (1) is a value in the matrix corresponding to different first electrodes Tx at different time points, Cmxnyn is a capacitance value of the touch panel at different positions, and f (rcxnyn) is an equivalent impedance value of the touch panel at different positions.
After the input signals are sequentially inputted into each scanning area 21, each scanning area 21 generates a plurality of output signals corresponding to different second electrodes Ry, and transmits the plurality of output signals to the corresponding second electrodes Ry, as shown in step S307. This step is similar to the concept of the mutual capacitance scanning described in fig. 4, except that the mutual capacitance scanning is performed in each scanning area 21 after the touch panel is divided into a plurality of scanning areas 21.
For example, in the embodiment of the invention, after the input signals including the matrix are input into the first scanning area 211, 36 output signals are generated, wherein the 36 output signals are respectively transmitted to the corresponding second electrodes Ry, and the second scanning area 212 to the eighth scanning area 218 also operate in the same manner. In other words, the output signal received by each second electrode Ry includes 8 matrices of 8 levels corresponding to different scanning regions 21.
In an embodiment of the invention, a conductive object, such as a finger, can form at least one touch point 23 on at least one scan area 21 and generate at least one corresponding touch signal, such as a change in capacitance or voltage. The touch signal is mixed with the input signal of the scanning area 21 and generates at least one output signal, which is transmitted to the corresponding second electrode Ry. By analyzing the output signals received by the second electrodes Ry, the position of the touch point 23 can be known, for example, the first electrode Tx and the second electrode Ry corresponding to the touch point 23 can be known.
For example, the touch point 23 in fig. 7 is generated on the sixth scanning area 216, and when the input signal is inputted into the sixth scanning area 216, the input signal is mixed with the touch signal generated by the touch point 23 on the sixth scanning area 216 to generate an output signal, and the output signal is transmitted to the corresponding second electrode Ry.
Please refer to fig. 9, which is a flowchart illustrating a scanning method of a touch panel according to a second embodiment of the present invention. The second embodiment is different from the first embodiment in that the scanning area 21 corresponding to the touch point 23 is first found out, and then the input signal is input into the scanning area where the touch point 23 is located, so as to shorten the scanning time and improve the scanning efficiency.
First, a matrix is defined, wherein the matrix moments defined have an inverse matrix, as shown in step S401. In other words, the matrix defined in step S401 is a non-singular square matrix or a reversible square matrix. In a preferred embodiment of the present invention, the defined matrix is a hadamard matrix. Then, the touch panel is divided into a plurality of scanning areas 21 along the direction of the first electrodes Tx according to the number of the matrix, wherein each scanning area 21 includes a plurality of first electrodes Tx, as shown in step S403.
In an embodiment of the invention, the order of the matrix is smaller than the number of the first electrodes Tx of the touch panel.
In an embodiment of the present invention, the number of the first electrodes Tx of the scan area is equal to the order of the matrix.
A first input signal is respectively input into the plurality of first electrodes Tx, and at least one touch point 23 is formed on at least one scan area to generate at least one corresponding touch signal, as shown in step S405. When a user touches the touch panel, the touch panel generates a touch signal, such as at least one touch point 23 formed on at least one scan area 21, and generates a corresponding at least one touch signal, such as a change in capacitance or voltage. Certainly, in practical applications, the first input signal may be input first and then the touch point 23 is formed, or the touch point 23 may be formed first and then the first input signal is input.
The touch signal on the at least one first electrode Tx is mixed with the first input signal to generate at least one first output signal, as shown in step S407. For example, in an embodiment of the present invention, the touch point 23 is formed in the sixth scanning area 216, and the touch panel includes 60 first electrodes Tx, at this time, the first input signals can be respectively input into the 60 first electrodes Tx, and then the generated 60 first output signals are respectively transmitted back to the corresponding first electrodes Tx, and the scanning area 21 corresponding to the touch point 23 is known to be the sixth scanning area 216 from the first output signals, as shown in step S409.
After the scanning area 21 where the touch point 23 is formed is known, a second input signal may be further input into the scanning area 21 where the touch point 23 is formed, wherein the second input signal includes the matrix defined in step S401, as shown in step S411. For example, in fig. 7, the position of the touch point 23 is the sixth scanning area 216, and the step S411 only needs to input the second input signal including the matrix defined in the step S401 into the sixth scanning area 216.
Fig. 10 is a schematic view of a scanning area of a touch panel according to another embodiment of the invention. As shown in the figure, in the embodiment of the present invention, the range of the touch point 23 is large, and may be generated between the two scanning areas 21, and includes the range of the plurality of first electrodes Tx. For example, the touch point 23 is generated between the fourth scanning area 214 and the fifth scanning area 215, in which case step S411 needs to input the second input signal comprising the matrix defined in step S401 into the fourth scanning area 214 and the fifth scanning area 215, respectively.
After the second input signal is input, the second input signal of the scanning area 21 forming the touch point 23 and the touch signal are mixed to generate at least one second output signal, as shown in step S413. Then, the second output signal is transmitted to the corresponding second electrode Ry, as shown in step S415. Finally, by analyzing the second output signal received by the second electrode Ry, the position of the touch point 23 can be obtained, for example, the first electrode Tx and the second electrode Ry corresponding to the touch point 23 can be obtained.
The scanning method of the touch panel according to the present invention mainly determines whether a touch point 23 is formed on the touch panel by analyzing and comparing the difference between the output signal (or the second output signal) received by the second electrode Ry and the initial output signal. The initial output Signal, which may also be referred to as a Baseline Signal (Baseline Signal) according to the present invention, refers to an initial capacitance or an initial voltage at the crossing point of each first electrode Tx and each second electrode Ry when no touch point 23 is formed on the touch panel.
Since the equivalent impedance of the touch panel is different at different positions, the initial output signals of the touch panel are different at different positions without forming the touch points 23. In addition, the number of the signals received by each sensing electrode Rx varies with the magnitude of the matrix. In other words, the larger the matrix selected, the larger the range of signal variation that the receiving device for receiving the signal has to accept. In order to cope with various signal variations and avoid signal over-saturation (overflow) conditions, the acceptable range (input range) of the receiving device must be increased, which also results in Increased Circuit (IC) cost. Therefore, it is necessary to compensate the initial signals at different positions on the touch panel to a same or close level to reduce the circuit cost.
On the other hand, in the conventional baseline signal compensation method, initial capacitances or voltage values corresponding to the crossing points of each driving electrode 111 and each sensing electrode 112 need to be recorded, and then the initial capacitances or voltage values of all the crossing points are compensated. That is, if a touch panel has 60 driving electrodes and 36 sensing electrodes, it is necessary to perform 2160(60 × 36) sets of compensation. This method not only has a large number of compensation sets and a complicated operation, but also needs to be implemented by an additional compensation circuit.
Therefore, the compensation method of the touch panel provided by the invention can use a smaller matrix for compensation, thereby reducing the setting cost of the circuit, reducing the number of compensation groups and more efficiently compensating the initial capacitance value or the voltage value of the touch panel.
Please refer to fig. 11, which is a flowchart illustrating a compensation method of a touch panel according to a first embodiment of the present invention. First, a matrix is defined, wherein the defined matrix has an inverse matrix, as shown in step S501. In other words, the matrix defined in step S501 is a non-singular square matrix or a reversible square matrix. In a preferred embodiment of the present invention, the defined matrix is a hadamard matrix. Then, the touch panel is divided into a plurality of scanning areas along the direction of the first electrodes Tx according to the number of the matrix, wherein each scanning area includes a plurality of first electrodes Tx, as shown in step S503. An input signal is respectively input into the plurality of scanning regions 21, and a plurality of output signals respectively corresponding to the different scanning regions 21 and the different second electrodes Ry are generated, wherein the input signal includes the matrix defined in step S501, as shown in step S505. Steps S501 to S505 are similar to steps S301 to S305 of the scanning method, and will not be described in detail here.
After the output signals are generated, a plurality of compensation signals are generated according to the plurality of output signals, wherein the compensation signals correspond to the plurality of output signals, respectively, as shown in step S507. In an embodiment of the present invention, the sum of the compensation signal and the corresponding output signal is zero. For example, if the output voltage VoRy1 received by the first second electrode Ry1 of the first scanning area 211 at the first time point D1 is 2, the step S507 generates a voltage with a value of-2 as the compensation signal.
In an embodiment of the invention, the compensation signal can be generated by at least one compensation circuit (not shown), wherein the compensation circuit is electrically connected to the touch panel. For example, the output signals corresponding to different scanning regions 21 and different second electrodes Ry may be stored in a memory (not shown). The compensation circuit can be connected to the storage and the first electrode Tx, and reads each output signal from the storage, and generates a corresponding compensation signal according to each read output signal to input into the first electrode Tx.
In an embodiment of the invention, the number of the compensation signals is the number of the scanning regions 21 multiplied by the number of the second electrodes Ry. For example, the matrix defined in step S501 is an 8-step hadamard matrix, and the touch panel used includes 60 first electrodes Tx and 36 second electrodes Ry, the touch panel will be divided into 8 scanning areas 21, and the number of compensation signals generated at the same time point in step S507 is 288.
For example, the foregoing formula (1) can output an output signal VoRy1, wherein VoRy1 is an output signal received by the first second electrode Ry1 of the first scanning region 211 at the first time point D1, and VoRy1 corresponds to 8 first electrodes Tx of the first scanning region 211, step S507 generates 1 compensation signal according to the output signal VoRy1, and so on, each scanning region 21 generates 36 compensation signals at the same time point.
The first embodiment of the compensation method of the touch panel can effectively reduce the compensation number of the compensation signals, improve the compensation efficiency of the touch panel and reduce the complexity and the cost of the compensation circuit.
Please refer to fig. 12, which is a flowchart illustrating a compensation method of a touch panel according to a second embodiment of the present invention. The difference between the first embodiment and the second embodiment is that the compensation signal is input through the electrode without input signal, so that the compensation circuit is not required to be additionally built, thereby achieving the purpose of compensation and saving the cost of the whole circuit.
First, an input signal is input into at least one first electrode Tx, as shown in step S601. An output signal corresponding to the first electrode Tx is generated as shown in step S603. The output signals are analyzed to generate one or more compensation signals, as shown in step S605. One or more compensation signals are input to one or more first electrodes Tx to which the rest of the input signals are not input, as shown in step S607.
In an embodiment of the present invention, a mutual capacitance scanning concept may be applied, in step S603, a plurality of output signals respectively corresponding to the first electrode Tx and the different second electrodes Ry may be generated, and the plurality of output signals are respectively transmitted to the corresponding plurality of second electrodes Ry, and then step S605 is performed to analyze each output signal received by the different second electrodes Ry and generate the corresponding compensation signal.
For example, when the touch panel includes 60 first electrodes Tx and 36 second electrodes Ry, each first electrode Tx generates 36 output signals corresponding to different second electrodes Ry, and each second electrode Ry receives 60 output signals corresponding to different first electrodes Tx. When the touch panel is divided into eight scanning areas 21 along the direction of the first electrode Tx and includes 36 second electrodes Ry, each scanning area 21 generates 36 output signals corresponding to different second electrodes Ry, and each second electrode Ry receives 8 output signals corresponding to different scanning areas 21.
In the embodiment of the invention, the values of the input signals may be different no matter whether the touch panel is divided into a plurality of scanning areas, and the values of the input signals are analyzed respectively and corresponding compensation signals are generated according to the input signals.
In an embodiment of the present invention, the sum of the compensation signal and the corresponding output signal is zero. For example, if the input signal is inputted only to the first electrode Tx1 and the output voltage received by the first second electrode Ry1 is 2, the compensation signals can be inputted to the second first electrode Tx2 to the fifth first electrode Tx5 as-1, 0, -1, and 0, respectively, such that the sum of the compensation signal and the corresponding output signal is zero. In another embodiment, the compensation signals may be respectively input to-1, 0, -1, and 0 from the second first electrode Tx2, the fourth first electrode Tx4, the seventh first electrode Tx7, and the ninth first electrode Tx9, so that the sum of the compensation signals and the corresponding output signals is zero.
If the input signal is inputted only to the first electrode Tx1 and the output voltage received by the first second electrode Ry1 is 1, a-1 signal can be inputted to the third first electrode Tx3 as a compensation signal.
In an embodiment of the invention, the input signal may include a matrix with inverse matrix, for example, the input signal may include a hadamard matrix, a non-singular square matrix or a reversible square matrix, and the touch panel is divided into a plurality of scanning areas 21 along the direction of the first electrodes Tx according to the order of the matrix, and the number of the first electrodes Tx inputted by the input signal each time is equal to the order of the matrix used.
The words used in the specification, for the purposes of describing the invention, are not intended to be limiting. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification, singular values (e.g., one and the same) may be plural unless the context clearly dictates otherwise. For example, a device referred to in this specification may comprise a combination of two or more devices, and a substance referred to in this specification may comprise a mixture of substances.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, i.e., the present invention is intended to include all equivalent variations and modifications in the shape, structure, characteristics and spirit of the present invention as described in the claims of the present invention.
Claims (23)
1. A scanning method of a touch panel, wherein the touch panel comprises a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are interlaced with each other, the scanning method of the touch panel comprising the steps of:
defining a matrix, wherein the matrix has an inverse matrix;
dividing the touch panel into a plurality of scanning areas along the direction of the first electrodes according to the number of orders of the matrix, wherein each scanning area comprises a plurality of first electrodes;
inputting an input signal into a plurality of the scanning areas respectively, wherein the input signal comprises the matrix; and
each scanning area respectively generates a plurality of output signals corresponding to different second electrodes, and respectively transmits the plurality of output signals to the corresponding second electrodes.
2. The method for scanning a touch panel according to claim 1, further comprising the steps of:
forming at least one touch point on at least one scanning area and generating at least one corresponding touch signal;
mixing the touch signal and the input signal on at least one scanning area to generate at least one output signal;
transmitting the output signal to the corresponding second electrode; and
and analyzing the output signal received by the second electrode to obtain the position of the touch point.
3. The method of claim 1, wherein the matrix is a hadamard matrix, a nonsingular square matrix, or a reversible square matrix.
4. The method according to claim 1, wherein the number of the first electrodes in the scanning area is equal to the number of stages of the matrix.
5. The method according to claim 1, wherein the matrix has a smaller number of stages than the number of first electrodes of the touch panel.
6. The method according to claim 4, wherein when the number of the first electrodes is not a multiple of the order of the matrix, two adjacent scanning areas include the shared first electrode.
7. A scanning method of a touch panel, wherein the touch panel comprises a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are interlaced with each other, the scanning method of the touch panel comprising the steps of:
defining a matrix, wherein the matrix has an inverse matrix;
dividing the touch panel into a plurality of scanning areas along the direction of the first electrodes according to the number of orders of the matrix, wherein each scanning area comprises a plurality of first electrodes;
respectively inputting a first input signal into the plurality of first electrodes, forming at least one touch point on at least one scanning area, and generating at least one corresponding touch signal;
mixing the touch signal on at least one first electrode with the first input signal to generate at least one first output signal;
obtaining the scanning area forming the touch point according to the first output signal;
inputting a second input signal into the scanning area forming the touch point, wherein the second input signal comprises the matrix;
mixing the second input signal and the touch signal of the scanning area forming the touch point to generate at least one second output signal; and
and transmitting the second output signal to the corresponding second electrode.
8. The method for scanning a touch panel according to claim 7, further comprising the steps of:
and analyzing the second output signal received by the second electrode to obtain the position of the touch point.
9. The method of claim 7, wherein the matrix is a Hadamard matrix, a nonsingular square matrix, or a reversible square matrix.
10. The method according to claim 7, wherein the number of the first electrodes in the scanning area is equal to the number of stages of the matrix.
11. The method according to claim 7, wherein the matrix has a smaller number of stages than the number of driving electrodes of the touch panel.
12. The method according to claim 10, wherein when the number of the first electrodes is not a multiple of the order of the matrix, two adjacent scanning areas include the shared first electrode.
13. The method for scanning a touch panel according to claim 7, further comprising the steps of:
and transmitting the first output signal to the first electrode, and obtaining the scanning area forming the touch point according to the first output signal.
14. A compensation method of a touch panel, wherein the touch panel comprises a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are interlaced with each other, the compensation method of the touch panel comprises the following steps:
defining a matrix, wherein the matrix has an inverse matrix;
dividing the touch panel into a plurality of scanning areas along the direction of the first electrodes according to the number of orders of the matrix, wherein each scanning area comprises a plurality of first electrodes;
respectively inputting an input signal into a plurality of scanning areas and generating a plurality of output signals respectively corresponding to different scanning areas and different second electrodes, wherein the input signal comprises the matrix; and
generating a plurality of compensation signals according to the plurality of output signals, wherein the compensation signals correspond to the plurality of output signals respectively.
15. The compensation method for a touch panel according to claim 14, wherein the matrix is a hadamard matrix, a nonsingular square matrix, or a reversible square matrix.
16. The compensation method of claim 14, wherein the number of compensation signals is the number of scanning areas multiplied by the number of second electrodes.
17. The compensation method of claim 14, wherein the sum of the compensation signal and the corresponding output signal is zero.
18. The compensation method for a touch panel according to claim 14, further comprising the steps of:
the compensation signal is generated by at least one compensation circuit, wherein the compensation circuit is electrically connected with the touch panel.
19. A compensation method of a touch panel, wherein the touch panel comprises a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are interlaced with each other, the compensation method of the touch panel comprises the following steps:
inputting an input signal into at least one of the first electrodes;
generating one or more output signals, wherein the output signals correspond to the first electrodes;
analyzing the output signal to generate one or more compensation signals; and
one or more of the compensation signals are input to the remaining one or more of the first electrodes to which the input signal is not input.
20. The compensation method for a touch panel according to claim 19, wherein the input signal comprises a matrix, wherein the matrix has an inverse matrix, and the number of the first electrodes inputted by the input signal is equal to the order of the matrix.
21. The compensation method for a touch panel according to claim 20, wherein the matrix is a hadamard matrix, a nonsingular square matrix, or a reversible square matrix.
22. The compensation method of claim 19, wherein the sum of the compensation signal and the corresponding output signal is zero.
23. The compensation method for a touch panel according to claim 19, wherein the output signals are plural and respectively correspond to different second electrodes, and the output signals are respectively transmitted to the corresponding second electrodes.
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| CN101387927A (en) * | 2008-11-04 | 2009-03-18 | 友达光电股份有限公司 | Touch control detecting method of touch control panel |
| CN102203707A (en) * | 2009-03-31 | 2011-09-28 | 国际商业机器公司 | Multi-touch optical touch panel |
| CN105094413A (en) * | 2014-05-22 | 2015-11-25 | 联咏科技股份有限公司 | Touch apparatus, touch controller, and noise detection method for touch panel |
| CN205193766U (en) * | 2015-12-08 | 2016-04-27 | 上海中航光电子有限公司 | Touch display panel and touch display device |
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| KR101281018B1 (en) * | 2012-07-20 | 2013-07-08 | (주)실리콘화일 | Separated scan method of touch panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387927A (en) * | 2008-11-04 | 2009-03-18 | 友达光电股份有限公司 | Touch control detecting method of touch control panel |
| CN102203707A (en) * | 2009-03-31 | 2011-09-28 | 国际商业机器公司 | Multi-touch optical touch panel |
| CN105094413A (en) * | 2014-05-22 | 2015-11-25 | 联咏科技股份有限公司 | Touch apparatus, touch controller, and noise detection method for touch panel |
| CN205193766U (en) * | 2015-12-08 | 2016-04-27 | 上海中航光电子有限公司 | Touch display panel and touch display device |
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