TWI811927B - Touch signal processing method, touch chip, touch display device and information processing device - Google Patents

Abstract

A touch signal processing method, suitable for a touch module and implemented using a control circuit, the touch signal processing method includes: performing a row projection operation and a column projection operation on a frame of touch sensing data to obtain the frame of touch Control the maximum value of each row and the maximum value of each column of the sensing data; perform a comparison operation on the maximum value of each row and the maximum value of each column according to a threshold to generate at least one valid row projection value and at least one valid the column projection value; and performing a row and column intersection operation on the at least one valid row projection value and the at least one valid column projection value to find at least one valid touch point.

Description

Touch signal processing method, touch chip, touch display device and information processing device set

The present invention relates to touch detection, and in particular, to a method that can quickly obtain the touch peak position.

In existing touch screen systems, when a user clicks on the touch panel and forms a touch image on the touch panel, the touch panel sets a threshold and defines an area with a sensing value higher than the threshold as a touch screen. The effective area of the control image is quantified, and the sensing value in the effective area is quantified and the sensing peak value caused by the touch and the corresponding width range are defined to obtain a touch coordinate.

However, in the existing technology, the above-mentioned effective area must be arrayed across the touchable area of the entire touch panel, and each row and column must be scanned step by step to filter out the maximum value before the location of the sensing peak and the corresponding value can be determined. The wide range not only slows down the processing speed, but also makes it difficult to search effectively to integrate data and circuits into the hardware.

In order to solve the above problems, a novel touch signal processing method is urgently needed in this field.

One object of the present invention is to disclose a touch signal processing method, which can project the sensing value to the substrate direction, and obtain the sensing peak value and the corresponding substrate sensing width based on the substrate sensing value projected in the substrate direction.

Another object of the present invention is to disclose a touch recognition device that can project the sensing value to the substrate direction and obtain the sensing peak value and the corresponding substrate sensing width based on the substrate sensing value projected in the substrate direction.

To achieve the above purpose, a touch signal processing method is proposed, which is suitable for a touch module and is implemented using a control circuit. The touch signal processing method includes: performing a line projection operation on a frame of touch sensing data and A column projection operation is performed to obtain the maximum value of each row and the maximum value of each column of the touch sensing data of the frame; Perform a comparison operation on the maximum value of each row and the maximum value of each column according to a threshold to generate at least one valid row projection value and at least one valid column projection value; and perform a comparison operation on the at least one valid row projection The value and the at least one valid column projection value perform a row and column intersection operation to find at least one valid touch point.

In one embodiment, the row and column intersection operation includes: finding at least one row and column intersection point based on the row number of the at least one valid row projection value and the column number of the at least one valid column projection value, And at the intersection point of the at least one row and column, find the data corresponding to the touch sensing data of the frame that is greater than the threshold to obtain the at least one effective touch point.

To achieve the above object, the present invention further proposes a touch chip, which is used to drive a touch panel and has a functional module to perform a touch signal processing method. The method includes: touch sensing for one frame. The data is subjected to a row projection operation and a column projection operation to obtain the maximum value of each row and the maximum value of each column of the touch sensing data of the frame; the maximum value of each row and the maximum value of each column are compared according to a threshold. operate to generate at least one valid row projection value and at least one valid column projection value; and perform a row and column intersection operation on the at least one valid row projection value and the at least one valid column projection value to find at least A valid touch point.

In one embodiment, the row and column intersection operation includes: finding at least one row and column intersection point based on the row number of the at least one valid row projection value and the column number of the at least one valid column projection value, And at the intersection point of the at least one row and column, find the data corresponding to the touch sensing data of the frame that is greater than the threshold to obtain the at least one effective touch point.

In one embodiment, the touch panel is a capacitive touch panel.

To achieve the above object, the present invention further proposes a touch display device, which has a touch display panel and at least one touch chip for driving the touch display panel, wherein the touch chip has a functional module. To execute a touch signal processing method, the method includes: Perform a row projection operation and a column projection operation on a frame of touch sensing data to obtain the maximum value of each row and the maximum value of each column of the frame of touch sensing data; calculate the maximum value of each row and each column according to a threshold Perform a comparison operation on the maximum value to generate at least one valid row projection value and at least one valid column projection value; and perform a row and column operation on the at least one valid row projection value and the at least one valid column projection value. Intersection operation to find at least one valid touch point.

In one embodiment, the row and column intersection operation includes: finding at least one row and column intersection point based on the row number of the at least one valid row projection value and the column number of the at least one valid column projection value, And at the intersection point of the at least one row and column, find the data corresponding to the touch sensing data of the frame that is greater than the threshold to obtain the at least one effective touch point.

In one embodiment, the touch display panel is a capacitive touch display panel.

To achieve the above object, the present invention further proposes an information processing device, which has a central processing unit and the aforementioned touch display device, and the central processing unit is used to communicate with the touch display device.

In possible embodiments, the information processing device may be a smart phone, a tablet computer, a notebook computer, a smart watch or an access control device.

In order to enable the review committee to further understand the structure, characteristics and purpose of the present invention, drawings and detailed descriptions of preferred embodiments are attached as follows.

Step a: Perform a row projection operation and a column projection operation on a frame of touch sensing data to obtain the maximum value of each row and the maximum value of each column of the touch sensing data of the frame

Step b: Perform a comparison operation on the maximum value of each row and the maximum value of each column according to a threshold to generate at least one valid row projection value and at least one valid column projection value.

Step c: Perform a row and column intersection operation on the at least one valid row projection value and the at least one valid column projection value to find at least one valid touch point

100:Information processing device

110: Central processing unit

120:Touch display device

121:Touch display panel

122:Control circuit

200:Touch area

210: Induction value

212: Induction peak

220: first array

220a: First array sensing value

222: First array local peak

230:Second array

230a: Second array sensing value

232: Second array local peak

XP1, XP2, XP3, XP4: first substrate sensing width

YP1, YP2, YP3, YP4, YP5: Second substrate sensing width

R: Sensing true point

G: Induction ghost point

GP1, GP2, GP3, GP4, GP5: sensing range

FIG. 1 illustrates a flow chart of an embodiment of a touch signal processing method of the present invention.

FIG. 2 is a block diagram of an embodiment of the information processing device of the present invention.

FIG. 3 is a schematic diagram of a plurality of sensing values formed by a touch image on the touch display panel in FIG. 2 in a touch area of the touch panel.

FIG. 4 is a schematic diagram of the sensing peak value and the substrate sensing width obtained based on the sensing values in FIG. 3 .

FIG. 5 is a schematic diagram after removing the sensing ghost points from the sensing peak value obtained in FIG. 4 .

FIG. 6 is a schematic diagram after improving the edge of the touch range corresponding to the substrate sensing width obtained in FIG. 5 .

Please refer to FIGS. 1 and 2 , wherein FIG. 1 illustrates a flow chart of an embodiment of a touch signal processing method of the present invention; and FIG. 2 illustrates a block diagram of an embodiment of an information processing device of the present invention. As shown in Figure 2, an information processing device 100 can be a smart phone, a tablet computer, a notebook computer, a smart watch or an access control device, and has a central processing unit 110 and a touch display device 120 , wherein the central processing unit 110 is used to communicate with the touch display device 120 .

The touch display device 120 has a touch display panel 121 and a control circuit 122 for driving the touch display panel 121. The control circuit 122 includes at least one touch chip, wherein the touch chip has a functional module to Execute the touch signal processing method as shown in Figure 1, which includes: performing a row projection operation and a column projection operation on a frame of touch sensing data to obtain the maximum value of each row and the maximum value of each column of the touch sensing data of the frame (Step a); perform a comparison operation on the maximum value of each row and the maximum value of each column according to a threshold to generate at least one valid row projection value and at least one valid column projection value (step b); and Perform a row and column intersection operation on the at least one valid row projection value and the at least one valid column projection value to find at least one valid touch point (step c).

In step c, the row and column intersection operation includes: finding at least one row and column intersection point from the row number of the at least one valid row projection value and the column number of the at least one valid column projection value, and At the at least one row and column intersection point, find the data corresponding to the frame of touch sensing data that is greater than the threshold to obtain the at least one effective touch point.

In addition, the touch display panel 121 may be a capacitive touch display panel.

Please refer to FIG. 3 , which is a schematic diagram of a plurality of sensing values formed in a touch area of the touch display panel 121 by a touch image on the touch display panel 121 in FIG. 2 . Specifically, the touch display panel 121 can define a touch area 200 , where the touch area 200 is, for example, an area formed by a range in which the touch display panel 121 can sense a user's click or touch operations. When the user clicks or touches the touch display panel 121 , the part where the finger contacts the touch display panel 121 will form a touch image, and the touch image will form a plurality of sensing values on the touch area 200 210. In this embodiment, the touch area 200 is, for example, a two-dimensional plane and includes a plurality of base directions. These base directions The base directions are linearly independent of each other and include, for example, a first base direction (X direction) and a second base direction (Y direction), and these base directions are preferably orthogonal to each other.

After that, a first array 220 and a second array 230 can be established according to the length of the touch area 200 in the first substrate direction and the second substrate direction. In this embodiment, the touch area 200 is in The length in the first base direction is, for example, 18 units, and the length in the second base direction is, for example, 32 units. Then, the plurality of sensing values 210 formed on the touch area 200 can be projected onto the first array 220 and the second array 230 to obtain a plurality of first array sensing values 220a and a plurality of second array sensing values. 230a.

Specifically, the first array sensing values 220a are respectively the maximum values of the sensing values 210 corresponding to the positions of the first array sensing values 220a and in the second substrate direction, and the second array sensing values are The values 230a are respectively the maximum values of the sensing values 210 corresponding to the positions of the second array sensing values 230a and in the first substrate direction. Taking the leftmost first array sensing value 220a in Figure 3 as an example, the sensing values 210 corresponding to the position of the leftmost first array sensing value 220a and along the second substrate direction are: 2, -3, -7, ......, 4, -1 and -2, and the maximum value among them is 34 in the 27th column, so the sensing value 210 corresponding to 34 is projected to the first array 220 and becomes the leftmost first array sensing Value 220a, and other first array sensing values 220a in the first array 220 are also obtained in the same manner, which will not be described again. Similarly, the uppermost sensing value 210 in Figure 3 is 2, -5, 0,..., 3, 2 and 2 along the first base direction, and the maximum value is 14 in the 5th row, so It is projected to the second array 230 and becomes the uppermost second array sensing value 230a. The other second array sensing values 230a in the second array 230 are also obtained in the same way, which will not be described again here.

When implemented in a programmatic manner, mutually coupled loops can be established according to the sizes of the first array 220 and the second array 230, and each first array sensing value 220a and each second array can be recorded through a conditional judgment expression. Induction value 230a, the details are as follows:

Furthermore, the above code can be implemented using an arithmetic logic unit (ALU) accelerator, and the original 18×32 comparisons can be simplified to only 18+32 ALU calculations. Specifically, As follows:

Among these first array sensing values 220a, the first array sensing value 220a that is larger than the two adjacent first array sensing values 220a is defined as the first array local peak value 222. Specifically, in order to prevent the sensing value 210 caused by noise or external interference in the untouched area from being judged as a touch, the touch chip can preset or define a sensing threshold, and the sensing value smaller than the above sensing threshold can be A value of 210 will not be considered a valid touch. In other words, the first array local peak value 222 needs to meet the following two conditions: (1) its sensing value 210 is greater than the sensing threshold; (2) for any first array local peak value P _n , satisfy P _n >P _n-1 and P _n >P _n+1 , where P _n-1 and P _n+1 are the two adjacent first array sensing values 220a of the first array local peak P _n . In this embodiment, if the sensing threshold is set to [150], then the local peaks 222 of the first array that satisfy the above two conditions are [807] in the 5th row, [767] in the 10th row, and [767] in the 12th row. [879] and [800] on line 14.

On the other hand, the second array sensing value 230a that is larger than the two adjacent second array sensing values 230a is defined as the second array local peak value 232, and is the same as the first array local peak value 222, and is smaller than the above sensing threshold. The sensing value 210 will not be regarded as a valid touch. In this embodiment, the second array local peak 232 that is greater than the sensing threshold [150] and greater than the two adjacent second array sensing values 230a is the 11th [737] in column, [767] in column 13, [800] in column 15, [879] in column 23, and [807] in column 28.

After obtaining the first array local peak value 222 and the second array local peak value 232 , these first array local peak values 222 and the second array local peak value 232 can be further coupled to restore the composite touch image in the touch area 200 The resulting induction peak 212. In this embodiment, [767], [800], [879] and [807] in the second array local peak value 232 can all correspond to the first array local peak value 222, so the above four values can be quickly obtained The synthesized induction peaks 212 are located at (10,13), (14,15), (12,23) and (5,28) respectively. As for [737] which does not correspond to the first array local peak 222, it is in the first The position in the substrate direction must be the same as one of the above four values, so it can be quickly confirmed that the position of the synthesized induction peak 212 is (5,11). In other words, compared with the past need to scan and compare each sensing value 210 on the touch area 200 one by one, by coupling the first array local peak value 222 with the second array local peak value 232, the value of the sensing peak value 212 in the touch area can be quickly obtained. By touching the position on the area 200, the processing speed is greatly improved.

Please refer to FIG. 4 , which is a schematic diagram of the sensing peak value and the substrate sensing width obtained based on the sensing values in FIG. 3 . After obtaining the positions of the above-mentioned sensing peaks 212 on the touch area 200, the adjacent first array sensing values 220a and the second adjacent array sensing values 220a can be scanned from the positions of the sensing peaks 212 along the first substrate direction and the second substrate direction. Array sensing value 230a, and the base sensing value greater than the sensing threshold among these base sensing values is defined as the width sensing value, and the width of these width sensing values in the first base direction and the second base direction is further calculated to obtain a plurality of bases Sensing width. Taking this embodiment as an example, four first array local peak values 222 and five second array local peak values 232 can respectively be calculated to obtain four first substrate sensing widths XP1, XP2, XP3, XP4 and five second substrate sensing widths. Widths YP1, YP2, YP3, YP4, YP5, among which the four first substrate sensing widths XP1, XP2, XP3, and XP4 are [5], [3], [3], [3] respectively, and the five first base The two substrate sensing widths YP1, YP2, YP3, YP4, and YP5 are [3], [3], [3], [3], and [3] respectively. In this way, the sensing peak 212 formed by the touch image in the touch area 200 and the corresponding base sensing width can be quickly obtained, allowing the touch module 12 to effectively search and integrate data and circuits into the hardware. middle.

Please refer to FIG. 5 , which is a schematic diagram after removing the sensing ghost points from the sensing peak value obtained in FIG. 4 . According to the above calculation steps, it can be found that when the number of first array local peaks 222 and the number of second array local peaks 232 are different, the extra first array local peaks 222/second array local peaks 232 need to be compared with the completed ones. The specific position of the coupled second array local peak 232/first array local peak 222 can be determined by comparing them in the second substrate direction/the first substrate direction. In the execution of the program, the user can directly perform cross-coupling comparison on all the first array local peaks 222 and the second array local peaks 232 at one time, and eliminate the induction ghost point (ghost point) G to obtain the real Induction true point R. Specifically, when the sensing threshold is set to [150], the user can correspond these first array local peaks 222 to a plurality of first array local peak positions (5, 10, 12, 14) Couple with the plurality of second array local peak positions (11, 13, 15, 23, 28) corresponding to the second array local peaks 232 of the second array 230 and obtain 20 peak positions to be determined: (5, 11), (5,13), (5,15), ..., (14,23), (14,28), these 20 peak positions to be determined can correspond to the sensing value 210 on the touch area 200 And obtain a plurality of sensing values to be determined. However, only the sensing value to be determined that is greater than the sensing threshold is the sensing true point R, and the rest are sensing ghost points G. Taking Figure 5 as an example, the first base square The sensing value R(1,1) coupled to the first group of positions in the direction and the first group of positions in the second substrate direction is [737]>[150], so it is the sensing true point R, and the sensing value R(1,1) in the first substrate direction The sensing values G(1,2), G(1,3) and G(1,4) of the second group of positions, the third group of positions and the fourth group of positions coupled with the first group of positions in the second substrate direction are respectively [39], [19] and [2] are all smaller than the sensing threshold [150], so these sensing values are sensing ghost points G and should be eliminated from the effective sensing values. Through the detection of the sensing true point R and the sensing ghost point G, it can be verified whether the sensing peak 212 and the corresponding base sensing width obtained through the touch signal processing method of the present invention include area points that are not actually touched, thereby Reduce the chance of touch signal distortion or error.

Please refer to FIG. 6 , which is a schematic diagram after improving the edge of the touch range corresponding to the substrate sensing width obtained in FIG. 5 . Similar to detecting the sensing true point R and the sensing ghost point G, the above-mentioned width sensing value can be corresponded to a plurality of first array width positions of the first array 220 and the width sensing value can be corresponding to the first array 220 in one go. A plurality of second array width positions of the two arrays 230 are coupled to obtain a plurality of width positions to be determined. Taking this embodiment as an example, the first base sensing width XP1[5] of the first group and the second base sensing width YP1[3] of the first group can be directly coupled to 5*3=15 width positions to be determined, These width positions to be determined can correspond to the sensing values 210 on the touch area 200 and a plurality of width sensing values to be determined are obtained. However, only the width sensing values to be determined that are greater than the sensing threshold are valid touch values. Therefore, by comparing these width sensing values to be determined with the sensing threshold, as shown in Figure 6, a complex set of sensing ranges GP1, GP2, GP3, GP4, GP5, and correspond to a plurality of first array sensing widths and second array sensing widths.

It is worth mentioning that when determining the relationship between the width sensing value and the sensing threshold to be determined, the self-sensing peak 212 can be selected to spread along both sides of the first substrate direction and the second substrate direction until a value smaller than the sensing threshold is scanned. The width sensing value to be determined (scanning from the inside to the outside in terms of the sensing range GP1); or the width sensing value to be determined can be scanned from the width sensing value at the boundary to the local maximum value among these width sensing values to be determined, which is what should theoretically exist Sensing peak value 212 compares the size of each width sensing value to be determined with the sensing threshold value one by one, and obtains the at least one first array sensing width and the at least one second array sensing width ( For the sensing range GP3 (scanning from outside to inside), the same result can be obtained, thereby improving the edge detection signal of the touch image.

What is disclosed in this case is a preferred embodiment. Any partial changes or modifications derived from the technical ideas of this case and easily inferred by those familiar with the art will not deviate from the scope of the patent rights of this case.

To sum up, regardless of the purpose, means and effects of this case, it shows that it is completely different from the conventional technology, and that the invention is practical first, and indeed meets the patent requirements for inventions. I sincerely ask the review committee to take a clear look and grant the patent as soon as possible for your benefit. Society is a prayer for the Supreme Being.

Step a: Perform a row projection operation and a column projection operation on a frame of touch sensing data to obtain the maximum value of each row and the maximum value of each column of the touch sensing data of the frame

Step b: Perform a comparison operation on the maximum value of each row and the maximum value of each column according to a threshold to generate at least one valid row projection value and at least one valid column projection value.

Step c: Perform a row and column intersection operation on the at least one valid row projection value and the at least one valid column projection value to find at least one valid touch point

Claims (7)

A touch signal processing method, suitable for a touch module and implemented using a control circuit, the touch signal processing method includes: performing a row projection operation and a column projection operation on a frame of touch sensing data to obtain the frame of touch Control the maximum value of each row and the maximum value of each column of the sensing data; perform a comparison operation on the maximum value of each row and the maximum value of each column according to a threshold to generate at least one valid row projection value and at least one valid The column projection value; and performing a row and column intersection operation on the at least one valid row projection value and the at least one valid column projection value to find at least one valid touch point; wherein the row and column intersection operation includes: Find at least one row and column intersection point from the row number of the at least one valid row projection value and the column number of the at least one valid column projection value, and at the at least one row and column intersection point in the frame Find the data corresponding to the touch sensing data that is greater than the threshold to obtain the at least one effective touch point. A touch chip is used to drive a touch panel and has a functional module to perform a touch signal processing method. The method includes: performing a row projection operation and a column projection operation on a frame of touch sensing data to obtain the frame. The maximum value of each row and the maximum value of each column of the touch sensing data; a comparison operation is performed on the maximum value of each row and the maximum value of each column according to a threshold to generate at least one valid row projection value and at least one Valid column projection values; and performing a row and column intersection operation on the at least one valid row projection value and the at least one valid column projection value to find at least one valid touch point; wherein the row and column intersection operation includes : Find at least one row and column intersection point from the row number of the at least one valid row projection value and the column number of the at least one valid column projection value, and at the at least one row and column intersection point at the Find the data corresponding to the frame of touch sensing data that is greater than the threshold to obtain the at least one effective touch point. The touch chip according to claim 2, wherein the touch panel is a capacitive touch panel. A touch display device has a touch display panel and at least one touch chip used to drive the touch display panel, wherein the touch chip has a functional module to execute a touch signal processing method, the The method includes: performing a row projection operation and a column projection operation on a frame of touch sensing data to obtain the maximum value of each row and the maximum value of each column of the touch sensing data of the frame; and calculating the maximum value of each row and the maximum value of each column according to a threshold. performing a comparison operation on the maximum values of each column to generate at least one valid row projection value and at least one valid column projection value; and performing a comparison operation on the at least one valid row projection value and the at least one valid column projection value. A row and column intersection operation to find at least one valid touch point; wherein the row and column intersection operation includes: finding the row number of the at least one valid row projection value and the column number of the at least one valid column projection value. Find at least one row and column intersection point, and find at the at least one row and column intersection point among the data corresponding to the frame of touch sensing data that is greater than the threshold to obtain the at least one effective touch point. The touch display device according to claim 4, wherein the touch display panel is a capacitive touch display panel. An information processing device has a central processing unit and the touch display device as described in any one of claims 4 to 5, and the central processing unit is used to communicate with the touch display device. The information processing device described in claim 6 is an electronic device selected from the group consisting of smartphones, tablet computers, notebook computers, smart watches and access control devices.