CN115079867A - Input accuracy detection and correction method for capacitive touch screen - Google Patents
Input accuracy detection and correction method for capacitive touch screen Download PDFInfo
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- CN115079867A CN115079867A CN202210689638.5A CN202210689638A CN115079867A CN 115079867 A CN115079867 A CN 115079867A CN 202210689638 A CN202210689638 A CN 202210689638A CN 115079867 A CN115079867 A CN 115079867A
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- 238000012937 correction Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 230000002159 abnormal effect Effects 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims description 4
- 238000013075 data extraction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04186—Touch location disambiguation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0447—Position sensing using the local deformation of sensor cells
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Abstract
The invention discloses a detection and correction method for input accuracy of a capacitive touch screen, which relates to the technical field of mobile terminals and specifically comprises the following detection and correction steps: determining a to-be-detected correction position of the capacitive touch screen as a preset first touch coordinate, and storing the preset first touch coordinate in a correction database; controlling an input interface for displaying a touch object at the position to be corrected according to the operation of a user, wherein the touch object is correspondingly preset with a first touch coordinate; the method comprises the steps that a user carries out multi-frequency point touch operation on a touch screen to generate operation signals, and a plurality of second touch coordinates of the user are calculated based on the operation signals; judging whether a second touch coordinate of the user is the same as a preset first touch coordinate of a position to be corrected on the touch screen, and obtaining test data; and calculating the touch accuracy rate of each operation point of the to-be-detected correction position when the operation point touches based on the test data, and processing the obtained abnormal frequency point to realize the calibration of the detection point position of the touch screen.
Description
Technical Field
The invention relates to the technical field of mobile terminals, in particular to a detection and correction method for input accuracy of a capacitive touch screen.
Background
Capacitive touch screens are an important component of touch screen systems. Capacitive touch screens are typically constructed of two layers of material, one being a glass top layer and one being an ITO insulating layer, with X and Y axis components mounted in between. When a finger or an object with charges contacts the screen, the electric field of a touch point is changed, so that the capacitance is changed, and the change of the capacitance can be detected after the return signal is amplified, so that the touch is detected.
The capacitive touch screen realizes the display screen for positioning the touch point of the user by detecting the tiny change of the electrical parameter, and the detected tiny electrical parameter change is easily interfered by static electricity or radio frequency in the positioning process of the touch screen, so that the actual touch coordinate and the touch coordinate of the touch object on the touch screen have different errors, and the erroneous judgment is caused, thereby causing the input error.
Disclosure of Invention
The invention aims to provide a detection and correction method for input accuracy of a capacitive touch screen, which solves the following technical problems:
in the positioning process of the touch screen, the detected small electric parameter change is easily interfered by static electricity or radio frequency, so that different errors exist between an actual touch coordinate and a touch coordinate of a touch object on the touch screen, and the erroneous judgment is caused to cause input errors.
The purpose of the invention can be realized by the following technical scheme:
a detection and correction method for input accuracy of a capacitive touch screen specifically comprises the following detection and correction steps:
s101, determining a to-be-detected correction position of the capacitive touch screen as a preset first touch coordinate, and storing the preset first touch coordinate in a correction database;
step S102, controlling an input interface of a touch object to be displayed at the position to be corrected according to the operation of a user, wherein the touch object is correspondingly preset with a first touch coordinate;
step S103, performing multi-frequency point touch operation on the touch screen by a user to generate an operation signal, and calculating a plurality of second touch coordinates of the user based on the operation signal;
step S104, judging whether a second touch coordinate of the user is the same as a preset first touch coordinate of a to-be-detected correction position on the touch screen, and obtaining test data;
and S105, calculating the touch accuracy of each operation point of the to-be-detected correction position of the user when the operation point touches based on the test data, and processing the obtained abnormal frequency point.
Preferably, when the user starts the electronic device or performs the touch correction function, the information in the correction database prompts the user to perform touch correction according to the position to be corrected through the navigation interface, and stores touch correction data generated by performing finger touch correction on the user and the first touch coordinate information.
Preferably, the touch object includes at least one of a virtual key and a touch icon.
Preferably, the operating frequency band of the touch screen is 80-160kHz, and the operating frequency band is determined as the position to be detected and corrected of the capacitive touch screen.
Preferably, in step S104, the determining method specifically includes the following steps:
comparing the second touch coordinate with a touch area of a preset first touch coordinate on the touch screen;
when the touch area corresponding to the second touch coordinate is partially overlapped with the first touch coordinate area, judging that the second touch coordinate is positioned at a contact point in the first touch coordinate area in the to-be-detected correction position and marked as a first contact point m, and marking the rest contact points as second contact points n which are contact points not belonging to the first touch coordinate area;
uploading the second contact n execution to the execution database.
Preferably, in the step S105, a touch accuracy threshold is preset, the touch accuracy when each operation point of the to-be-detected correction position is touched is compared with the threshold, and when the touch accuracy is lower than the threshold, the operation point is determined as an abnormal frequency point.
Preferably, the obtained abnormal frequency points are processed;
wherein the treatment process is as follows:
recognizing the touch shape of the finger of the user according to the operation signal, and calculating the touch area of the user;
acquiring a touch offset direction and an offset distance corresponding to the finger from a correction database based on the finger touched by the user;
and performing touch compensation processing on the touch coordinate of the user according to the touch offset direction and the offset distance of the finger of the user, and determining the touch object.
Preferably, when the finger touch correction data extraction test is performed on the user, the user is prompted to complete the extraction test on a commonly used finger according to a common usage habit.
Preferably, when data obtained by the test when the same finger touches a touch object at different positions is deviated, the average value of the various types of touch correction data of the finger is calculated and stored after the test is completed
The invention has the beneficial effects that:
(1) according to the capacitive touch screen, data of touch detection points comprise original values and difference values, the difference values are offset of the original values relative to reference values, in the working process of the capacitive touch screen, when a user performs point touch on a position to be detected and corrected, capacitance of the point positions changes, the original values output by the point positions change, the difference values change, when the difference value of one point position of the capacitive touch screen is larger than a preset difference threshold value, a touch event occurs on the touch detection point, coordinate information of the point position can be obtained through an algorithm, and based on the obtained coordinate information and a correction database, touch accuracy of the position of one detection point can be accurately obtained, so that an area with low touch accuracy can be conveniently processed;
(2) according to the method, the touch area of the user is calculated according to the touch shape of the finger of the user, the resolution on the touch screen and the size of the touch screen; based on the acquired touch coordinate point of the to-be-detected correction position of the touch screen, the touch coordinate of the user is respectively compensated for corresponding unit lengths in the horizontal direction and the vertical direction, so that an accurate touch point position can be obtained, and the calibration of the detection point position of the touch screen is realized.
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The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a method for detecting and correcting input accuracy of a capacitive touch screen according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a method for detecting and correcting input accuracy of a capacitive touch screen, specifically including the following steps:
s101, determining a to-be-detected correction position of the capacitive touch screen as a preset first touch coordinate, and storing the preset first touch coordinate in a correction database;
for a capacitive touch screen, data of touch detection points of the capacitive touch screen comprises an original value and a difference value, wherein the difference value is an offset of the original value relative to a reference value, in the working process of the capacitive touch screen, when a user performs point contact on a position to be detected and corrected, capacitance of a point location changes, so that the original value output by the point location changes, and the difference value changes, when the difference value of a certain point location of the capacitive touch screen is greater than a preset difference threshold value, a touch event occurs at the touch detection point, and then coordinate information of the point location can be obtained through an algorithm;
when the user starts the electronic equipment or performs a touch correction function, the information in the correction database prompts the user to perform touch correction according to the position to be corrected through the navigation interface, and stores touch correction data generated by finger touch correction of the user and first touch coordinate information;
the same user usually only uses one or a plurality of fingers to perform touch input, and when the same finger of the same user touches each touch object on the touch screen, the touch area, the touch shape, the touch offset direction and the offset distance are all approximately the same, so that when the user performs the finger touch correction data extraction test, the user is prompted to complete the extraction test on the commonly used fingers according to the common use habit;
if the data obtained by testing when the same finger touches the touch objects at different positions have deviation, respectively calculating and storing the average value of various touch correction data of the finger after the test is finished;
the correction bits to be detected of the touch screen can be determined according to the experience of technicians, for example, when the related technicians summarize that the working frequency band of the capacitive touch screen is between 80 and 160kHz in the working process, the 80 to 160kHz can be determined as the correction bits to be detected of the capacitive touch screen;
step S102, controlling an input interface of a touch object to be displayed at the position to be corrected according to the operation of a user, wherein the touch object is correspondingly preset with a first touch coordinate;
the touch object comprises at least one of a virtual key and a touch icon; for example, the user's operation includes operations of starting, performing, and ending a touch correction function, starting, performing, and ending a finger touch feature extraction test with a touch object displayed on the touch screen to input a signal;
step S103, performing multi-frequency point touch operation on the touch screen by a user to generate an operation signal, and calculating a plurality of second touch coordinates of the user based on the operation signal;
step S104, judging whether a second touch coordinate of a user is the same as a preset first touch coordinate of a to-be-detected correction position on the touch screen, and obtaining test data;
specifically, the judging method in step S104 includes the following steps:
s1041, comparing the second touch coordinate with a touch area of a preset first touch coordinate on the touch screen;
s1042, when a touch area corresponding to the second touch coordinate is partially overlapped with the first touch coordinate area, judging that the second touch coordinate is located at a contact point in the first touch coordinate area in the to-be-detected correction position and marked as a first contact point m, and marking the rest contact points as second contact points n which are not contact points in the first touch coordinate area;
s1043, uploading the execution of the second contact n to an execution database;
step S105, calculating the touch accuracy rate of each operation point of the to-be-detected correction position of the user when the operation point touches based on the test data, and processing the obtained abnormal frequency point;
in the step S105, a touch accuracy threshold is preset, the touch accuracy when each operation point of the calibration position to be detected touches is compared with the threshold, and when the touch accuracy is lower than the threshold, it is determined as an abnormal frequency point;
processing the obtained abnormal frequency points;
wherein the treatment process is as follows:
s1051, identifying the touch shape of the user finger according to the operation signal, and calculating the touch area of the user;
s1052, acquiring a touch offset direction and an offset distance corresponding to the finger from a correction database based on the finger touched by the user;
s1053, performing touch compensation processing on the touch coordinate of the user according to the touch offset direction and the offset distance of the finger of the user, and determining the touch object;
specifically, the touch area of the user is calculated according to the touch shape of the finger of the user, the resolution on the touch screen and the size of the touch screen; assuming that the touch coordinate of the user is (x0, y0), the obtained touch offset direction of the finger of the user is 45 degrees at the lower left corner, the offset distance is offset by 1 unit length in the horizontal direction, and the offset distance is offset by 1 unit length in the vertical direction, the touch coordinate of the user is respectively compensated by one unit in the horizontal direction and the vertical direction, namely (x0+1, y0+1), and thus the accurate touch point position can be obtained.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. A capacitive touch screen input accuracy detection and correction method is characterized by specifically comprising the following detection and correction steps:
s101, determining a to-be-detected correction position of the capacitive touch screen as a preset first touch coordinate, and storing the preset first touch coordinate in a correction database;
step S102, controlling an input interface of a touch object to be displayed at the position to be corrected according to the operation of a user, wherein the touch object is correspondingly preset with a first touch coordinate;
step S103, performing multi-frequency point touch operation on the touch screen by a user to generate an operation signal, and calculating a plurality of second touch coordinates of the user based on the operation signal;
step S104, judging whether a second touch coordinate of a user is the same as a preset first touch coordinate of a to-be-detected correction position on the touch screen, and obtaining test data;
and S105, calculating the touch accuracy of each operation point of the to-be-detected correction position of the user when the operation point touches based on the test data, and processing the obtained abnormal frequency point.
2. The method as claimed in claim 1, wherein the information in the correction database is obtained by prompting a user to perform touch correction according to a position to be corrected through a navigation interface when the user turns on the electronic device or performs a touch correction function, and storing touch correction data generated by performing finger touch correction on the user and the first touch coordinate information.
3. The method of claim 2, wherein the touch object comprises at least one of a virtual key and a touch icon.
4. The method for detecting and correcting the input accuracy of the capacitive touch screen as recited in claim 3, wherein an operating frequency band of the touch screen is 80-160kHz to determine the position to be corrected of the capacitive touch screen.
5. The method for detecting and correcting the input accuracy of the capacitive touch screen according to claim 1, wherein in step S104, the determining method specifically comprises the following steps:
comparing the second touch coordinate with a touch area of a preset first touch coordinate on the touch screen;
when the touch area corresponding to the second touch coordinate is partially overlapped with the first touch coordinate area, judging that the second touch coordinate is positioned at a contact point in the first touch coordinate area in the to-be-detected correction position and marked as a first contact point m, and marking the rest contact points as second contact points n which are contact points not belonging to the first touch coordinate area;
uploading the second contact n execution to the execution database.
6. The method as claimed in claim 1, wherein in step S105, a touch accuracy threshold is preset, the touch accuracy of each operation point at the position to be corrected is compared with the threshold, and when the touch accuracy is lower than the threshold, the operation point is determined as an abnormal frequency point.
7. The method for detecting and correcting the input accuracy of the capacitive touch screen according to claim 6, wherein the obtained abnormal frequency points are processed;
wherein the treatment process is as follows:
recognizing the touch shape of the finger of the user according to the operation signal, and calculating the touch area of the user;
acquiring a touch offset direction and an offset distance corresponding to the finger from a correction database based on the finger touched by the user;
and performing touch compensation processing on the touch coordinate of the user according to the touch offset direction and the offset distance of the finger of the user, and determining the touch object.
8. The method for detecting and correcting the input accuracy of the capacitive touch screen according to claim 1, wherein when a finger touch correction data extraction test is performed on a user, the user is prompted to complete the extraction test for a commonly used finger according to a common usage habit.
9. The method as claimed in claim 8, wherein if there is a deviation in the data obtained when the same finger touches different touch objects at different positions, the average value of the touch correction data of the finger is calculated and stored after the test is completed.
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