CN111381729A - Touch point positioning method and device of capacitive touch screen - Google Patents
Touch point positioning method and device of capacitive touch screen Download PDFInfo
- Publication number
- CN111381729A CN111381729A CN202010227952.2A CN202010227952A CN111381729A CN 111381729 A CN111381729 A CN 111381729A CN 202010227952 A CN202010227952 A CN 202010227952A CN 111381729 A CN111381729 A CN 111381729A
- Authority
- CN
- China
- Prior art keywords
- capacitance
- node
- peak
- variation
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention provides a touch point positioning method of a capacitive touch screen, which comprises the following steps: detecting capacitance values of all capacitance nodes; calculating the capacitance value variation of all capacitance nodes, and determining a touch area; selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node; and calculating the coordinate of the touch point according to the capacitance value variation and the coordinate of the capacitance node group or the capacitance value variation and the coordinate of the peak capacitance node and the capacitance node group. The invention also provides a touch point positioning device of the capacitive touch screen. According to the method and the device for positioning the touch point of the capacitive touch screen, the coordinate of the touch point is obtained by calculation by utilizing the capacitance value variation and the coordinate of the selected capacitance node, so that the touch position can be calculated more accurately and efficiently, and various application requirements are met.
Description
Technical Field
The invention relates to the technical field of capacitive touch control, in particular to a method and a device for positioning a touch point of a capacitive touch screen.
Background
At present, capacitive touch is more and more commonly applied in the touch industry, and touch detection and application are realized by utilizing the principle that a conductor is contacted with a surface capacitor and the capacitance value is reduced. When the conductor contacts the surface of the capacitive screen, a part of capacitance can be absorbed, so that a signal conducted to a receiving end is weakened, and due to the fact that the distance between the capacitance nodes is large, capacitance value change of one area (multiple capacitances) can be formed after a finger or a capacitance pen touches the capacitance nodes. The existing method for positioning the touch points has the problem of inaccurate results.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for positioning a touch point of a capacitive touch screen, so as to solve the problem of inaccurate positioning of the touch point.
Based on the above purpose, the present invention provides a method for positioning a touch point of a capacitive touch screen, comprising:
detecting capacitance values of all capacitance nodes;
calculating the capacitance value variation of all capacitance nodes, and determining a touch area;
selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node;
and calculating the coordinates of the touch point according to the parameters of the capacitance node group, or calculating the coordinates of the touch point according to the parameters of the peak capacitance node and the capacitance node group, wherein the parameters comprise capacitance value variation and coordinates.
In one embodiment, the selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node includes:
selecting a first capacitor node, a second capacitor node, a third capacitor node and a fourth capacitor node as a first capacitor node group, wherein the first capacitor node group is adjacent to the peak capacitor node, and the second capacitor node and the fourth capacitor node are adjacent to the peak capacitor node in the X electrode direction; in one embodiment, the selecting the peak capacitance node with the largest capacitance value variation in the touch area and the capacitance node group adjacent to the peak capacitance node includes:
selecting a first capacitor node, a second capacitor node, a third capacitor node and a fourth capacitor node as a first capacitor node group; selecting a non-peak capacitance node adjacent to the first capacitance node group as a second capacitance node group; the first capacitor node group is adjacent to the peak capacitor node, wherein the second and fourth capacitor nodes are adjacent to the peak capacitor node in the X electrode direction; the first and third capacitive nodes are adjacent to a peak capacitive node in a Y electrode direction.
In one embodiment, the calculating the coordinates of the touch point according to the parameters of the peak capacitance node and the capacitance node group includes:
summing the change value of the second capacitance node, the change value of the fourth capacitance node and the product of the change value of the peak capacitance node and the weight coefficient to obtain a first total change amount, wherein the change value comprises the product of the capacitance value change amount and the abscissa;
summing the capacitance value variation of the second capacitance node, the capacitance value variation of the fourth capacitance node and the product of the capacitance value variation of the peak capacitance node and the weight coefficient to obtain a second total variation;
summing the change value of the first capacitance node, the change value of the third capacitance node and the product of the change value of the peak capacitance node and the weight coefficient to obtain a third total change amount, wherein the change value comprises the product of the capacitance value change amount and the ordinate;
summing the capacitance value variation of the first capacitance node, the capacitance value variation of the third capacitance node and the product of the capacitance value variation of the peak capacitance node and the weight coefficient to obtain a fourth total variation;
and dividing the first total variation by the second total variation and dividing the third total variation by the fourth total variation respectively to obtain the abscissa and the ordinate of the touch point.
In one embodiment, the weight coefficient of the peak capacitance node is 0.1-1.
In one embodiment, the calculating coordinates of the touch point according to the parameters of the peak capacitive node and the capacitive node group includes:
summing products of capacitance value variation of the peak capacitance node and each capacitance node in the capacitance node group and the abscissa to obtain a fifth total variation;
summing products of capacitance value variation of the peak capacitance node and each capacitance node in the capacitance node group and the ordinate to obtain a sixth total variation;
summing capacitance value variable quantities of the peak capacitance node and each capacitance node in the capacitance node group to obtain a seventh total variable quantity;
and dividing the fifth total variation by the seventh total variation and dividing the sixth total variation by the seventh total variation respectively to obtain the abscissa and the ordinate of the touch point.
In one embodiment, the calculating the coordinates of the touch point according to the parameters of the capacitance node group includes:
summing the change value of the second capacitance node and the change value of the fourth capacitance node to obtain an eighth total change amount, wherein the change value comprises the product of the capacitance value change amount and the abscissa;
summing the capacitance value variation of the second capacitance node and the capacitance value variation of the fourth capacitance node to obtain ninth total variation;
summing the change value of the first capacitance node and the change value of the third capacitance node to obtain a tenth total change amount, wherein the change value comprises the product of the capacitance value change amount and the ordinate;
summing the capacitance value variation of the first capacitance node and the capacitance value variation of the third capacitance node to obtain an eleventh total variation;
and dividing the eighth total variation by the ninth total variation and dividing the tenth total variation by the eleventh total variation respectively to obtain the abscissa and the ordinate of the touch point.
In one embodiment, the determining the touch area includes:
comparing the capacitance value variation of all the capacitance nodes with a preset threshold value point by point row by row or column by column, wherein the capacitance nodes marked as being larger are 1, and the capacitance nodes marked as being smaller are 0;
connecting adjacent capacitor nodes marked as 1 in the same row or column in the row or column direction to obtain a continuous change area, and marking peak capacitor nodes of the continuous change area;
and respectively calculating the coordinate difference of the peak capacitance nodes of the continuous change areas of the adjacent rows or columns, and merging the continuous change areas of the adjacent rows or columns in the row or row direction to obtain the touch area when the coordinate difference is less than or equal to a preset difference.
The embodiment of the present invention further provides a touch point positioning device of a capacitive touch screen, including: the capacitance detection module is used for detecting the capacitance of all the capacitance nodes;
the touch area determining module is used for calculating capacitance value variation of all capacitance nodes and determining a touch area;
the capacitance node selection module is used for selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node;
and the touch point coordinate calculation module is used for calculating the coordinates of the touch points according to the parameters of the capacitance node group, or calculating the coordinates of the touch points according to the parameters of the peak capacitance node and the capacitance node group, wherein the parameters comprise capacitance value variation and coordinates.
An embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the method described above is implemented.
As can be seen from the above, the touch point positioning method of the capacitive touch screen provided by the invention can determine the touch area according to the capacitance value variation of the capacitance node, select the peak capacitance node from the touch area, select the capacitance node group adjacent to the peak capacitance node in a matching manner, and calculate the coordinate of the touch point according to the capacitance value variation and the coordinate of the capacitance node group or according to the capacitance value variation and the coordinate of the peak capacitance node and the capacitance node group, can accurately and quickly calculate the coordinate of the touch point, and can meet various application requirements.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart of a touch point positioning method for a capacitive touch screen according to an embodiment of the present invention;
FIG. 2 is a flowchart of determining a touch area according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a position relationship between a first capacitor node group and a peak capacitor point according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a touch area according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware structure of the electronic device according to the embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The capacitive touch screen is provided with a plurality of first electrodes distributed transversely and a plurality of second electrodes distributed longitudinally, and a capacitance node is formed at the intersection of each first electrode and each second electrode. The inventor of the present application found that in a long-term touch point detection operation, when a capacitive touch screen receives a touch, a capacitance signal near a touch position is reduced, and the capacitance signal closer to the touch position is reduced more, but a method of determining the touch position only by a change in the capacitance signal has a problem of being inaccurate.
The inventor of the application provides a novel touch point positioning method of a capacitive touch screen, based on the strength and weight of a regional signal, a peak capacitance node with the largest capacitance variation in a touch region is obtained through analysis, a capacitance node adjacent and/or close to the peak capacitance node is selected, the capacitance variation and the coordinate of the selected capacitance node are utilized to calculate the coordinate of a touch point, and the touch position can be calculated more accurately and efficiently.
Referring to fig. 1, the present invention provides a method for positioning a touch point of a capacitive touch screen, including:
s100, detecting capacitance values of all capacitance nodes;
s200, calculating capacitance value variation of all capacitance nodes, and determining a touch area;
s300, selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node;
and S400, calculating the coordinates of the touch point according to the parameters of the capacitance node group, or calculating the coordinates of the touch point according to the parameters of the peak capacitance node and the capacitance node group, wherein the parameters comprise capacitance value variation and coordinates.
According to the touch point positioning method of the capacitive touch screen, provided by the embodiment of the invention, the touch area can be determined according to the capacitance value variation of the capacitance node, the peak capacitance node is selected from the touch area, the capacitance node group adjacent to the peak capacitance node is selected in a matching manner, and the coordinate of the touch point is calculated according to the capacitance value variation and the coordinate of the capacitance node group or the capacitance value variation and the coordinate of the peak capacitance node and the capacitance node group.
In step S100, each capacitive node has an initial capacitance value. When a touch occurs, capacitance values of the touch point and the capacitance nodes near the touch point change correspondingly. Specifically, the driving signal is generated and can be converted into an analog receiving signal and converted into a digital signal through an AD converter, i.e., a capacitance value.
In step S200, calculating the capacitance variation of all the capacitance nodes means that the capacitance variation is obtained by subtracting the initial capacitance of the capacitance node from the capacitance of the capacitance node detected in real time.
The touch area is a surface touch area and is obtained by combining the passing line touch areas. The line touch area is a continuous change area formed by connecting a plurality of continuous capacitance nodes with the capacitance signal variation larger than a preset threshold value from one capacitance node in the transverse direction (X direction) or the longitudinal direction (Y direction). The surface touch area refers to a surface touch area obtained by combining continuously changing areas on adjacent electrodes according to the condition that the coordinate difference value of the peak capacitance point is less than or equal to a preset difference value, and the surface touch area obtained by combining is the touch area.
As in fig. 2, determining the touch area includes:
s210, comparing the capacitance value variation of all capacitance nodes with a preset threshold value point by point row or column by column, wherein the capacitance nodes marked as being larger are 1, and the capacitance nodes marked as being smaller are 0;
s220, connecting adjacent capacitor nodes marked as 1 in the same row or column in the row or column direction to obtain a continuous change area, and marking peak capacitor nodes of the continuous change area;
and S230, respectively calculating coordinate difference values of peak capacitance nodes of continuous change areas of adjacent rows or columns, and merging the continuous change areas of the adjacent rows or columns in the row or row direction to obtain the touch area when the coordinate difference values are less than or equal to a preset difference value.
In step S210, the preset threshold may be set empirically, or may be set to different values according to different sensitivity requirements. Different thresholds may be set for different electrodes. The capacitance value of the capacitance node is fluctuated when no touch occurs, so that the capacitance value variation quantity is compared with the preset threshold value, when the capacitance value variation quantity exceeds the preset threshold value, the touch control is determined to occur, and the accuracy of touch point positioning can be improved.
Specifically, when the capacitance value variation of the capacitance node is compared with the preset threshold, the comparison may be performed line by line and point by point. And analyzing sequentially from the first capacitor node in the first row to the last capacitor node, marking all the capacitor nodes with the capacitance value variation larger than the preset threshold value as 1, and marking all the capacitor nodes with the capacitance value variation larger than the preset threshold value as 0.
In step S220, during the connection, the connection starts from the first capacitor node marked as 1 in the row or column, and the connection ends from the first capacitor node marked as 0, which is used as a continuous variation area. The touch may be a single point touch or two or more multi-point touches, and when the touch is a multi-point touch, the continuously changing areas in the same row or column are multiple, and the peak capacitance node of each continuously changing area is marked respectively. Correspondingly, in step S230, a plurality of continuously changing areas of adjacent rows/columns need to be combined to obtain a touch area. It can be understood that the coordinate difference values of the peak capacitance nodes of the multiple continuous change areas in the adjacent rows or columns are respectively calculated, and when the coordinate difference value is less than or equal to a preset difference value, the multiple continuous change areas in the adjacent rows or columns are combined in the column or row direction to obtain the touch area.
It should be noted that when there is no adjacent capacitive node marked as 1 on the same row or column, that is, there is only one or more capacitive nodes that are not adjacent to each other on the same row or column, it is considered that the capacitive touch screen has a fault, and an accurate touch point cannot be calculated.
In a specific embodiment, as shown in table 1, the capacitance value variation of each capacitance node is compared with the corresponding preset threshold point by point row by row, so as to obtain three rows of touched capacitance nodes. The touch area comprises a first row, a second row, a third row and a fourth row, wherein the first row to the third row are provided with two continuous change areas, the peak capacitance node in each continuous change area is a central point, the peak capacitance nodes in the second row are capacitance nodes with the largest change, and the coordinate difference values of the peak capacitance node in the second row and the peak capacitance nodes in the first row and the third row are respectively calculated and are not more than 2, so that all capacitance nodes marked as 1 in the three rows are combined in the column direction to be used as the touch area.
In step S300, selecting the peak capacitance node with the largest capacitance variation in the touch area and the capacitance node group adjacent to the peak capacitance node may include:
and selecting the first capacitor node, the second capacitor node, the third capacitor node and the fourth capacitor node as a first capacitor node group.
The selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node may further include:
selecting a first capacitor node, a second capacitor node, a third capacitor node and a fourth capacitor node as a first capacitor node group; and selecting a non-peak capacitance node adjacent to the first capacitance node group as a second capacitance node group.
That is, the capacitive node groups include a first capacitive node group or a first capacitive node group and a second capacitive node group. The first capacitor node group is adjacent to the peak capacitor node, the second capacitor node group is adjacent to the first capacitor node group, and the second capacitor node group does not include the peak capacitor node.
TABLE 1 capacitive node labeling results
Specifically, the second and fourth capacitance nodes are adjacent to a peak capacitance node in the X electrode direction; the first and third capacitance nodes are adjacent to the peak capacitance node in the Y electrode direction, see fig. 3.
The second capacitor node group comprises a fifth capacitor node and an nth capacitor node, n is larger than or equal to 6, the value range of n can be infinite, and the value range of n is not beyond the surface of the electrode where the peak capacitor point is located, which corresponds to the insulating substrate. Optionally, n is an integer multiple of 4. Specifically, in application, the value of n is determined according to the range of the touch area, which may be understood as n extending from the peak capacitance point to the periphery in four points, at least one of the four outermost capacitance nodes is the outermost capacitance node of the touch area, and the four outermost capacitance nodes may also include the capacitance node of the non-touch area. Preferably, n is 9, i.e. the number of second capacitance nodes is 4.
In step S400, the calculation of the coordinates of the touch point includes a plurality of calculation methods, and three different calculation methods, i.e., a four-point calculation method, a five-point calculation method, and an n-point calculation method, are shown below. In practical application, different settings can be performed according to specific identification requirements of the touch point, such as identification speed and identification accuracy, and a corresponding calculation method is selected to realize different identification requirements. Specifically, when the capacitor node group includes only the first capacitor node group, different calculations may be performed depending on whether the peak capacitor node is selected. When the peak capacitance node is selected, the coordinates of the touch point are calculated by a five-point calculation method. And when the peak capacitance node is not selected, calculating the coordinates of the touch point by a four-point calculation method.
For the five-point calculation method, the method can comprise the following steps:
summing the change value of the second capacitance node, the change value of the fourth capacitance node and the product of the change value of the peak capacitance node and the weight coefficient to obtain a first total change amount, wherein the change value comprises the product of the capacitance value change amount and the abscissa;
summing the capacitance value variation of the second capacitance node, the capacitance value variation of the fourth capacitance node and the product of the capacitance value variation of the peak capacitance node and the weight coefficient to obtain a second total variation;
summing the change value of the first capacitance node, the change value of the third capacitance node and the product of the change value of the peak capacitance node and the weight coefficient to obtain a third total change amount, wherein the change value comprises the product of the capacitance value change amount and the ordinate;
summing the capacitance value variation of the first capacitance node, the capacitance value variation of the third capacitance node and the product of the capacitance value variation of the peak capacitance node and the weight coefficient to obtain a fourth total variation;
and dividing the first total variation by the second total variation and dividing the third total variation by the fourth total variation respectively to obtain the abscissa and the ordinate of the touch point.
Specifically, the five-point calculation method may calculate coordinates of the touch point by equations (1) and (2). X ═ P (P)2*P2.x+N*P0*P0.x+P4*P4.x)/(P2+N*P0+P4) (1) wherein (P) is passed2*P2.x+N*P0*P0.x+P4*P4X) is the first total variation, (P)2+N*P0+P4) Is the second total variation, X is the abscissa of the touch point, P2Is the capacitance variation of the second capacitance node, P2.x is the x coordinate of the second capacitance node, N is the weight coefficient of the peak capacitance node, P0Is the capacitance variation of the peak capacitance node, P0.x is the x coordinate of the peak capacitance node, P4Is the capacitance variation of the fourth capacitance node, P4.And x is the x coordinate of the fourth capacitive node.
Y＝(P1*P1.y+N*P0*P0.y+P3*P3.y)/(P1+N*P0+P3) (2) wherein (P)1*P1.y+N*P0*P0.y+P3*P3.y) Is the third total variation amount, (P)1+N*P0+P3) Is the fourth total variation, Y is the abscissa of the touch point, P1Is the capacitance variation of the first capacitance node, P1.y is the y coordinate of the first capacitance node, N is the weight coefficient of the peak capacitance node, P0Is the capacitance variation of the peak capacitance node，P0.yIs the y coordinate, P, of the peak capacitance node3Is the capacitance variation of the third capacitance node, P3.yThe y-coordinate of the third capacitive node.
The weight coefficient N can be an empirical value obtained according to batch debugging, and the value range is 0.1-1. The weight coefficient can play a role in inhibiting interference, can filter noise signals and improves the accuracy of calculation. The debugging principle of the weight coefficient is as follows: if the hardware signal is stable and the signal variation quantity difference of multiple sampling of a single point is not large, the value of N can be large. If the hardware signal is unstable and is easily interfered by the outside, the variation difference of a plurality of sampling signals of one point is large, and the value of N is required to be small, so that the weight of a peak capacitance node is reduced as much as possible, the weight of capacitance nodes around the peak capacitance node is improved, and the influence caused by the interference is inhibited.
For the four-point calculation method, it may include:
summing the change value of the second capacitance node and the change value of the fourth capacitance node to obtain an eighth total change amount, wherein the change value comprises the product of the capacitance value change amount and the abscissa;
summing the capacitance value variation of the second capacitance node and the capacitance value variation of the fourth capacitance node to obtain ninth total variation;
summing the change value of the first capacitance node and the change value of the third capacitance node to obtain a tenth total change amount, wherein the change value comprises the product of the capacitance value change amount and the ordinate;
summing the capacitance value variation of the first capacitance node and the capacitance value variation of the third capacitance node to obtain an eleventh total variation;
and dividing the eighth total variation by the ninth total variation and dividing the tenth total variation by the eleventh total variation respectively to obtain the abscissa and the ordinate of the touch point.
Specifically, the four-point calculation method may calculate coordinates of the touch point by equations (3) and (4). X ═ P (P)2*P2.x+P4*P4.x)/(P2+P4) (3) wherein (P)2*P2.x+P4*P4X) is the eighth total variation, (P)2+P4) Is the ninth total variation, X is the abscissa of the touch point, P2Is the capacitance variation of the second capacitance node, P2.x is the x coordinate of the second capacitor node, P4Is the capacitance variation of the fourth capacitance node, P4.x is the x coordinate of the fourth capacitance node;
Y＝(P1*P1.y+P3*P3.y)/(P1+P3) (4) wherein (P)1*P1.y+P3*P3.y) Is the tenth total variation amount, (P)1+P3) Is the eleventh total variation, Y is the abscissa of the touch point, P1Is the capacitance variation of the first capacitance node, P1.y is the y coordinate of the first capacitive node, P3Is the capacitance variation of the third capacitance node, P3.yThe y-coordinate of the third capacitive node.
As shown in fig. 4 and table 2, in a specific embodiment, 2, 3, 4 are receive line numbers, 7, 8, 9 are drive line numbers, point a is a peak capacitance node, coordinates are (8, 3), point b is a first capacitance node, coordinates are (8, 4), point c is a second capacitance node, coordinates are (8, 2), point d is a third capacitance node, coordinates are (7, 3), point e is a fourth capacitance node, coordinates are (9, 3), an actual touch position is a position pointed by an arrow, and is near the peak capacitance node (8, 3). P2Is 37, P2.x is 7, P0Is 48, P2.x is 8, P4Is 25, P4.x is 9, P1Is 35, P1.y is 4, P0.yIs 3, P3Is 26, P3.yIs 2.
Table 2 coordinate values and capacitance variation amounts of peak capacitance node and first capacitance node group
By using a 4-point counting algorithm and substituting equations 3 and 4, X ═ 7+25 ═ 9)/(37+25 ═ 7.81 and Y ═ 35 × 4+26 × (2)/(35 +26) ═ 3.15, that is, the coordinates of the touched point are (7.81, 3.15), and the accuracy is higher compared with the case where the touched point is closer to the actual touched position.
And (3) adopting a 5-point counting algorithm, taking a weight N as 0.5, substituting the capacitance value variation and corresponding coordinate values of each capacitance node into formula 1 and formula 2, wherein X is (37 × 7+0.5 × 48 + 8+25 × 9)/(37+48 × 0.5+25) ═ 7.86, Y is (35 × 4+0.5 × 48 + 3+26 × 2)/(35+48 +0.5 +26) ═ 3.10, namely the coordinates of the touch point are (7.86, 3.10), and the touch point is closer to the actual touch position and has higher accuracy.
And when the capacitance node group comprises a first capacitance node group and a second capacitance node group, calculating the coordinates of the touch point by an n-point calculation method.
The n-point calculation method may include:
summing products of capacitance value variation of the peak capacitance node and each capacitance node in the capacitance node group and the abscissa to obtain a fifth total variation;
summing products of capacitance value variation of the peak capacitance node and each capacitance node in the capacitance node group and the ordinate to obtain a sixth total variation;
summing capacitance value variable quantities of the peak capacitance node and each capacitance node in the capacitance node group to obtain a seventh total variable quantity;
and dividing the fifth total variation by the seventh total variation and dividing the sixth total variation by the seventh total variation respectively to obtain the abscissa and the ordinate of the touch point.
Specifically, the n-point calculation method may calculate the X-coordinate and the Y-coordinate of the touch point by equations (5) and (6), respectively.
X＝sum(Pn*Pn.x)/sum(Pn)＝(P0*P0.x+...+Pn*Pn.x)/(P0+…+Pn) (5) wherein, sum (P)n*Pn.x)＝(P0*P0.x+...+Pn*PnX) is the fifth total variation, sum (P)n)＝(P0+…+Pn) Is the seventh total variation, X is the abscissa of the touch point, P0Is the capacitance variation of the peak capacitance node, PnIs the capacitance variation of the nth capacitance node, P0.x is peak powerX coordinate of a capacitance node, Pn.x is the x coordinate of the nth capacitor node, sum (P)n*PnX) represents the sum of the products of the peak capacitance node and the change in capacitance value of the capacitance node in the set of capacitance nodes, sum (P)n) The method comprises the steps of summing capacitance value variation quantities of a peak capacitance node and capacitance nodes in a capacitance node group;
Y＝sum(Pn*Pn.y)/sum(Pn)＝(P0*P0.y+...+Pn*Pn.y)/(P0+…+Pn) (6) wherein, sum (P)n*Pn.y)＝(P0*P0.y+...+Pn*PnY) is the sixth total variation, sum (P)n)＝(P0+…+Pn) Is the seventh total variation, Y is the ordinate of the touch point, P0Is the capacitance variation of the peak capacitance node, P0.y is the y coordinate of the peak capacitance node, Pn.y is the y coordinate of the nth capacitor node, sum (P)n*PnY) represents summing the products of the capacitance values of the peak capacitive node and the capacitive nodes in the capacitive node group by the y coordinate.
In the n-point calculation method, when n is 9, the accuracy and the calculation speed are both preferable.
The coordinates of the touch point with better calculation speed and calculation accuracy can be obtained by a five-point calculation mode, and the method is suitable for the condition that certain requirements are met on the identification accuracy and the identification speed; through a four-point calculation mode, the calculation speed is fastest, the accuracy is good, and the method is suitable for the condition with high requirement on the identification speed; through the n-point calculation mode, the calculation accuracy is also better, and the method is suitable for the condition with higher requirement on the identification speed.
In one or more embodiments of the present disclosure, coordinates of a touch point with high accuracy can be obtained through different calculation methods. The capacitance value variation of each capacitance node is compared with a preset threshold value point by point line by line, the capacitance node exceeding the preset threshold value is marked as 1, adjacent capacitance nodes marked as 1 in the same row or column are connected according to the electrode length to obtain a continuous variation area, the continuous variation areas of adjacent electrodes with the coordinate difference of the peak capacitance point being less than or equal to 2 are combined in the row or column direction to obtain a touch area, and the touch area can be accurately determined. And selecting a peak capacitance node from the touch area in a matching manner, respectively selecting four capacitance nodes adjacent to the peak capacitance node on the X electrode and the Y electrode and 5-n capacitance nodes adjacent to the four capacitance nodes, and selecting a corresponding formula for calculation according to specific identification requirements. According to the capacitance value variation of the capacitance node, the coordinate or the capacitance value variation of the capacitance node, the coordinate and the weight, the coordinate position close to the touch point is obtained, the accurate positioning of the touch point position is improved, and meanwhile, various application requirements can be met.
It should be noted that the method of the embodiment of the present invention may be executed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene and completed by the mutual cooperation of a plurality of devices. In the case of such a distributed scenario, one of the multiple devices may only perform one or more steps of the method according to the embodiment of the present invention, and the multiple devices interact with each other to complete the method.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiment of the present invention further provides a device for positioning a touch point of a capacitive touch screen, including:
the capacitance detection module is used for detecting the capacitance of all the capacitance nodes;
the touch area determining module is used for calculating capacitance value variation of all capacitance nodes and determining a touch area;
the capacitance node selection module is used for selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node;
and the touch point coordinate calculation module is used for calculating the coordinates of the touch points according to the parameters of the capacitance node group, or calculating the coordinates of the touch points according to the parameters of the peak capacitance node and the capacitance node group, wherein the parameters comprise capacitance value variation and coordinates.
The touch point positioning device of the capacitive touch screen provided by the embodiment of the invention can determine the touch area through the touch area determining module, select the peak capacitance node and the capacitance node group adjacent to the peak capacitance node from the touch area through the capacitance node selecting module, and calculate the coordinate of the touch point according to the capacitance value variation and the coordinate of the capacitance node group or according to the capacitance value variation and the coordinate of the peak capacitance node and the capacitance node group, so that the coordinate of the touch point can be accurately and quickly calculated, and various application requirements can be met.
The capacitance node selection module is used for selecting a first capacitance node, a second capacitance node, a third capacitance node and a fourth capacitance node as a first capacitance node group, wherein the first capacitance node group is adjacent to the peak capacitance node, and the second capacitance node and the fourth capacitance node are adjacent to the peak capacitance node in the X electrode direction; the first and third capacitance nodes are adjacent to a peak capacitance node in a Y electrode direction.
The capacitance node selection module is further used for selecting a first capacitance node, a second capacitance node, a third capacitance node and a fourth capacitance node as a first capacitance node group; selecting a non-peak capacitance node adjacent to the first capacitance node group as a second capacitance node group; the first capacitor node group is adjacent to the peak capacitor node, wherein the second and fourth capacitor nodes are adjacent to the peak capacitor node in the X electrode direction; the first and third capacitive nodes are adjacent to a peak capacitive node in a Y electrode direction.
The touch point coordinate calculation module comprises a first calculation submodule. The first computation submodule is used for:
summing the change value of the second capacitance node, the change value of the fourth capacitance node and the product of the change value of the peak capacitance node and the weight coefficient to obtain a first total change amount, wherein the change value comprises the product of the capacitance value change amount and the abscissa;
summing the capacitance value variation of the second capacitance node, the capacitance value variation of the fourth capacitance node and the product of the capacitance value variation of the peak capacitance node and the weight coefficient to obtain a second total variation;
summing the change value of the first capacitance node, the change value of the third capacitance node and the product of the change value of the peak capacitance node and the weight coefficient to obtain a third total change amount, wherein the change value comprises the product of the capacitance value change amount and the ordinate;
summing the capacitance value variation of the first capacitance node, the capacitance value variation of the third capacitance node and the product of the capacitance value variation of the peak capacitance node and the weight coefficient to obtain a fourth total variation;
and dividing the first total variation by the second total variation and dividing the third total variation by the fourth total variation respectively to obtain the abscissa and the ordinate of the touch point.
Wherein the weight coefficient of the peak capacitance node is 0.1-1.
The touch point coordinate calculation module comprises a second calculation submodule. The second computation submodule is used for:
summing products of capacitance value variation of the peak capacitance node and each capacitance node in the capacitance node group and the abscissa to obtain a fifth total variation;
summing products of capacitance value variation of the peak capacitance node and each capacitance node in the capacitance node group and the ordinate to obtain a sixth total variation;
summing capacitance value variable quantities of the peak capacitance node and each capacitance node in the capacitance node group to obtain a seventh total variable quantity;
and dividing the fifth total variation by the seventh total variation and dividing the sixth total variation by the seventh total variation respectively to obtain the abscissa and the ordinate of the touch point.
The touch point coordinate calculation module includes a third calculation sub-module. The third computation submodule is used for:
summing the change value of the second capacitance node and the change value of the fourth capacitance node to obtain an eighth total change amount, wherein the change value comprises the product of the capacitance value change amount and the abscissa;
summing the capacitance value variation of the second capacitance node and the capacitance value variation of the fourth capacitance node to obtain ninth total variation;
summing the change value of the first capacitance node and the change value of the third capacitance node to obtain a tenth total change amount, wherein the change value comprises the product of the capacitance value change amount and the ordinate;
summing the capacitance value variation of the first capacitance node and the capacitance value variation of the third capacitance node to obtain an eleventh total variation;
and dividing the eighth total variation by the ninth total variation and dividing the tenth total variation by the eleventh total variation respectively to obtain the abscissa and the ordinate of the touch point.
The touch area determination module includes:
the capacitance value variation comparison submodule is used for comparing the capacitance value variation of all the capacitance nodes with the preset threshold value point by point row or column by column, the capacitance node marked with the result that the capacitance node is larger than the preset threshold value is 1, and the capacitance node marked with the result that the capacitance node is smaller than the preset threshold value is 0;
the continuous change area marking submodule is used for connecting adjacent capacitance nodes marked as 1 on the same row or column in the row or column direction to obtain a continuous change area and marking peak capacitance nodes of the continuous change area;
and the continuous change area merging submodule is used for respectively calculating the coordinate difference of the peak value capacitance nodes of the continuous change areas of the adjacent rows or columns, and when the coordinate difference is smaller than or equal to a preset difference, merging the continuous change areas of the adjacent rows or columns in the row or row direction to obtain the touch area.
The apparatus of the foregoing embodiment is used to implement the corresponding method in the foregoing embodiment, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
An embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the method described above is implemented.
Fig. 5 is a schematic diagram illustrating a more specific hardware structure of an electronic device according to this embodiment, where the electronic device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein the processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 are communicatively coupled to each other within the device via bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random access Memory), a static storage device, a dynamic storage device, or the like. The memory 1020 may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory 1020 and called to be executed by the processor 1010.
The input/output interface 1030 is used for connecting an input/output module to input and output information. The i/o module may be configured as a component in a device (not shown) or may be external to the device to provide a corresponding function. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.
The communication interface 1040 is used for connecting a communication module (not shown in the drawings) to implement communication interaction between the present apparatus and other apparatuses. The communication module can realize communication in a wired mode (such as USB, network cable and the like) and also can realize communication in a wireless mode (such as mobile network, WIFI, Bluetooth and the like).
It should be noted that although the above-mentioned device only shows the processor 1010, the memory 1020, the input/output interface 1030, the communication interface 1040 and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only those components necessary to implement the embodiments of the present description, and not necessarily all of the components shown in the figures.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A method for locating a touch point of a capacitive touch screen, comprising:
detecting capacitance values of all capacitance nodes;
calculating the capacitance value variation of all capacitance nodes, and determining a touch area;
selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node;
and calculating the coordinates of the touch point according to the parameters of the capacitance node group, or calculating the coordinates of the touch point according to the parameters of the peak capacitance node and the capacitance node group, wherein the parameters comprise capacitance value variation and coordinates.
2. The touch point positioning method of a capacitive touch screen according to claim 1,
the selecting of the peak capacitance node with the largest capacitance value variation in the touch area and the capacitance node group adjacent to the peak capacitance node includes:
selecting a first capacitor node, a second capacitor node, a third capacitor node and a fourth capacitor node as a first capacitor node group, wherein the first capacitor node group is adjacent to the peak capacitor node, and the second capacitor node and the fourth capacitor node are adjacent to the peak capacitor node in the X electrode direction; the first and third capacitance nodes are adjacent to a peak capacitance node in a Y electrode direction.
3. The method as claimed in claim 1, wherein the selecting the peak capacitance node with the largest capacitance variation and the capacitance node group adjacent to the peak capacitance node in the touch area comprises:
selecting a first capacitor node, a second capacitor node, a third capacitor node and a fourth capacitor node as a first capacitor node group; selecting a non-peak capacitance node adjacent to the first capacitance node group as a second capacitance node group; the first capacitor node group is adjacent to the peak capacitor node, wherein the second and fourth capacitor nodes are adjacent to the peak capacitor node in the X electrode direction; the first and third capacitive nodes are adjacent to a peak capacitive node in a Y electrode direction.
4. The method of claim 2, wherein the calculating coordinates of the touch point according to the parameters of the peak capacitive node and the set of capacitive nodes comprises:
summing the change value of the second capacitance node, the change value of the fourth capacitance node and the product of the change value of the peak capacitance node and the weight coefficient to obtain a first total change amount, wherein the change value comprises the product of the capacitance value change amount and the abscissa;
summing the capacitance value variation of the second capacitance node, the capacitance value variation of the fourth capacitance node and the product of the capacitance value variation of the peak capacitance node and the weight coefficient to obtain a second total variation;
summing the change value of the first capacitance node, the change value of the third capacitance node and the product of the change value of the peak capacitance node and the weight coefficient to obtain a third total change amount, wherein the change value comprises the product of the capacitance value change amount and the ordinate;
summing the capacitance value variation of the first capacitance node, the capacitance value variation of the third capacitance node and the product of the capacitance value variation of the peak capacitance node and the weight coefficient to obtain a fourth total variation;
and dividing the first total variation by the second total variation and dividing the third total variation by the fourth total variation respectively to obtain the abscissa and the ordinate of the touch point.
5. The method of claim 4, wherein a weight coefficient of the peak capacitance node is 0.1-1.
6. The method of claim 3, wherein the calculating coordinates of the touch point according to the parameters of the peak capacitive node and the set of capacitive nodes comprises:
summing products of capacitance value variation of the peak capacitance node and each capacitance node in the capacitance node group and the abscissa to obtain a fifth total variation;
summing products of capacitance value variation of the peak capacitance node and each capacitance node in the capacitance node group and the ordinate to obtain a sixth total variation;
summing capacitance value variable quantities of the peak capacitance node and each capacitance node in the capacitance node group to obtain a seventh total variable quantity;
and dividing the fifth total variation by the seventh total variation and dividing the sixth total variation by the seventh total variation respectively to obtain the abscissa and the ordinate of the touch point.
7. The method of claim 2, wherein the calculating coordinates of the touch point according to the parameters of the capacitance node group comprises:
summing the change value of the second capacitance node and the change value of the fourth capacitance node to obtain an eighth total change amount, wherein the change value comprises the product of the capacitance value change amount and the abscissa;
summing the capacitance value variation of the second capacitance node and the capacitance value variation of the fourth capacitance node to obtain ninth total variation;
summing the change value of the first capacitance node and the change value of the third capacitance node to obtain a tenth total change amount, wherein the change value comprises the product of the capacitance value change amount and the ordinate;
summing the capacitance value variation of the first capacitance node and the capacitance value variation of the third capacitance node to obtain an eleventh total variation;
and dividing the eighth total variation by the ninth total variation and dividing the tenth total variation by the eleventh total variation respectively to obtain the abscissa and the ordinate of the touch point.
8. The method of claim 1, wherein the determining the touch area comprises:
comparing the capacitance value variation of all the capacitance nodes with a preset threshold value point by point row by row or column by column, wherein the capacitance nodes marked as being larger are 1, and the capacitance nodes marked as being smaller are 0;
connecting adjacent capacitor nodes marked as 1 in the same row or column in the row or column direction to obtain a continuous change area, and marking peak capacitor nodes of the continuous change area;
and respectively calculating the coordinate difference of the peak capacitance nodes of the continuous change areas of the adjacent rows or columns, and merging the continuous change areas of the adjacent rows or columns in the row or row direction to obtain the touch area when the coordinate difference is less than or equal to a preset difference.
9. A touch point positioning device of a capacitive touch screen, comprising: the capacitance detection module is used for detecting the capacitance of all the capacitance nodes;
the touch area determining module is used for calculating capacitance value variation of all capacitance nodes and determining a touch area;
the capacitance node selection module is used for selecting a peak capacitance node with the largest capacitance value variation in the touch area and a capacitance node group adjacent to the peak capacitance node;
and the touch point coordinate calculation module is used for calculating the coordinates of the touch points according to the parameters of the capacitance node group, or calculating the coordinates of the touch points according to the parameters of the peak capacitance node and the capacitance node group, wherein the parameters comprise capacitance value variation and coordinates.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 8 when executing the program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010227952.2A CN111381729B (en) | 2020-03-27 | 2020-03-27 | Touch point positioning method and device for capacitive touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010227952.2A CN111381729B (en) | 2020-03-27 | 2020-03-27 | Touch point positioning method and device for capacitive touch screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111381729A true CN111381729A (en) | 2020-07-07 |
| CN111381729B CN111381729B (en) | 2023-04-25 |
Family
ID=71215711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010227952.2A Active CN111381729B (en) | 2020-03-27 | 2020-03-27 | Touch point positioning method and device for capacitive touch screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111381729B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112799533A (en) * | 2021-01-15 | 2021-05-14 | 青岛海信商用显示股份有限公司 | Touch point determination method and touch equipment |
| CN112882604A (en) * | 2021-03-01 | 2021-06-01 | 科世达(上海)机电有限公司 | Touch gesture recognition device and touch gesture recognition method |
| CN113625455A (en) * | 2021-10-11 | 2021-11-09 | 上海影创信息科技有限公司 | Pupil distance adjusting system and method based on capacitive touch and wearable system |
| CN115268758A (en) * | 2021-04-30 | 2022-11-01 | 惠州华阳通用电子有限公司 | Multi-system multi-display-area touch data distribution method and device |
| CN115562560A (en) * | 2021-07-02 | 2023-01-03 | 荣耀终端有限公司 | Handwriting drawing method and device, electronic equipment and readable storage medium |
| CN115617192A (en) * | 2022-06-20 | 2023-01-17 | 荣耀终端有限公司 | Touch positioning method and electronic equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120319994A1 (en) * | 2011-06-20 | 2012-12-20 | Naoyuki Hatano | Coordinate detecting device and coordinate detecting program |
| US20130057493A1 (en) * | 2011-09-01 | 2013-03-07 | Jonghee Hwang | Display having touch sensor and method for improving touch performance thereof |
| JP2013080344A (en) * | 2011-10-03 | 2013-05-02 | Rohm Co Ltd | Touch-type input device, controller thereof, control method, and electronic apparatus |
| US20130162593A1 (en) * | 2011-12-21 | 2013-06-27 | Futaba Corporation | Projected capacitive touch panel and coordinate detecting method thereof |
| US8692795B1 (en) * | 2010-08-24 | 2014-04-08 | Cypress Semiconductor Corporation | Contact identification and tracking on a capacitance sensing array |
| CN103902127A (en) * | 2014-04-09 | 2014-07-02 | 泰凌微电子（上海）有限公司 | Capacitive touch screen and touch position locating method thereof |
| CN104679373A (en) * | 2015-02-11 | 2015-06-03 | 广州中国科学院先进技术研究所 | Touch point positioning method for self capacitance touch screen |
| JP2016224834A (en) * | 2015-06-03 | 2016-12-28 | キヤノン株式会社 | Electronic device and control method thereof |
-
2020
- 2020-03-27 CN CN202010227952.2A patent/CN111381729B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8692795B1 (en) * | 2010-08-24 | 2014-04-08 | Cypress Semiconductor Corporation | Contact identification and tracking on a capacitance sensing array |
| US20120319994A1 (en) * | 2011-06-20 | 2012-12-20 | Naoyuki Hatano | Coordinate detecting device and coordinate detecting program |
| US20130057493A1 (en) * | 2011-09-01 | 2013-03-07 | Jonghee Hwang | Display having touch sensor and method for improving touch performance thereof |
| JP2013080344A (en) * | 2011-10-03 | 2013-05-02 | Rohm Co Ltd | Touch-type input device, controller thereof, control method, and electronic apparatus |
| US20130162593A1 (en) * | 2011-12-21 | 2013-06-27 | Futaba Corporation | Projected capacitive touch panel and coordinate detecting method thereof |
| CN103902127A (en) * | 2014-04-09 | 2014-07-02 | 泰凌微电子（上海）有限公司 | Capacitive touch screen and touch position locating method thereof |
| CN104679373A (en) * | 2015-02-11 | 2015-06-03 | 广州中国科学院先进技术研究所 | Touch point positioning method for self capacitance touch screen |
| JP2016224834A (en) * | 2015-06-03 | 2016-12-28 | キヤノン株式会社 | Electronic device and control method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112799533A (en) * | 2021-01-15 | 2021-05-14 | 青岛海信商用显示股份有限公司 | Touch point determination method and touch equipment |
| CN112882604A (en) * | 2021-03-01 | 2021-06-01 | 科世达(上海)机电有限公司 | Touch gesture recognition device and touch gesture recognition method |
| CN115268758A (en) * | 2021-04-30 | 2022-11-01 | 惠州华阳通用电子有限公司 | Multi-system multi-display-area touch data distribution method and device |
| CN115268758B (en) * | 2021-04-30 | 2024-05-07 | 惠州华阳通用电子有限公司 | Multi-system multi-display-area touch data distribution method and device |
| CN115562560A (en) * | 2021-07-02 | 2023-01-03 | 荣耀终端有限公司 | Handwriting drawing method and device, electronic equipment and readable storage medium |
| CN115562560B (en) * | 2021-07-02 | 2023-11-21 | 荣耀终端有限公司 | Handwriting drawing method and device, electronic equipment and readable storage medium |
| CN113625455A (en) * | 2021-10-11 | 2021-11-09 | 上海影创信息科技有限公司 | Pupil distance adjusting system and method based on capacitive touch and wearable system |
| CN115617192A (en) * | 2022-06-20 | 2023-01-17 | 荣耀终端有限公司 | Touch positioning method and electronic equipment |
| CN115617192B (en) * | 2022-06-20 | 2023-11-10 | 荣耀终端有限公司 | Touch positioning method and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111381729B (en) | 2023-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111381729B (en) | Touch point positioning method and device for capacitive touch screen | |
| US8982097B1 (en) | Water rejection and wet finger tracking algorithms for truetouch panels and self capacitance touch sensors | |
| US9684409B2 (en) | Hover position calculation in a touchscreen device | |
| US8797280B2 (en) | Systems and methods for improved touch screen response | |
| US9043183B1 (en) | Hard press rejection | |
| US8917257B2 (en) | Coordinate detecting device and coordinate detecting program | |
| US9207822B1 (en) | Contact identification and tracking on a capacitance sensing array | |
| US9164640B2 (en) | Barrier electrode driven by an excitation signal | |
| US9983738B2 (en) | Contact detection mode switching in a touchscreen device | |
| KR101493494B1 (en) | User device including fingerprint sensing region in touch screen | |
| KR101939103B1 (en) | Methods and apparatus to detect a presence of a conductive object | |
| US20120007832A1 (en) | Touch sensor device | |
| US9395853B2 (en) | Reducing common mode noise in touch applications | |
| WO2015016957A1 (en) | Method and apparatus for calculating coordinates with high noise immunity in touch applications | |
| US8902174B1 (en) | Resolving multiple presences over a touch sensor array | |
| CN103616972A (en) | Touch screen control method and terminal device | |
| US20160147373A1 (en) | Input device, and control method and program therefor | |
| US20140218333A1 (en) | Coordinate calculating method and touch module for single-layer capacitive touch device | |
| CN110036302A (en) | Using the capacitive sensing of multiple mode scanning | |
| CN109101127B (en) | Palm touch detection in a touch screen device with a floating ground or thin touch panel | |
| US8654089B2 (en) | Touch sensing circuit and touch sensing method | |
| CN108958565B (en) | Coordinate calculation method for multi-point capacitive touch, touch device and mobile terminal | |
| US20110050615A1 (en) | Processing circuit for determining touch points of touch event on touch panel and related method | |
| US20140028605A1 (en) | Touch Profiling on Capacitive-Touch Screens | |
| US9507454B1 (en) | Enhanced linearity of gestures on a touch-sensitive surface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |