CN109117014B - Pressure correction method and system for capacitive pressure sensing panel - Google Patents
Pressure correction method and system for capacitive pressure sensing panel Download PDFInfo
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- CN109117014B CN109117014B CN201710494330.4A CN201710494330A CN109117014B CN 109117014 B CN109117014 B CN 109117014B CN 201710494330 A CN201710494330 A CN 201710494330A CN 109117014 B CN109117014 B CN 109117014B
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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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
The application discloses a pressure correction method and a pressure correction system for a capacitive pressure sensing panel, wherein the method comprises the steps of marking on the surface of the capacitive pressure sensing panel by using first preset pressure, and collecting capacitance change data of a region marked by lines; restoring first capacitance change data of any point on the whole panel by using the capacitance change data of the line-drawn area; determining a first correction coefficient of any point on the panel according to the actual position of the point, wherein the first correction coefficient is used for enabling corrected pressure values output by any point of the whole panel under a first preset pressure to be equal; when any point of the panel is pressed by an external force smaller than a first preset pressure, a first correction coefficient corresponding to the point is extracted, and a pressure value corrected by the point is output by using the first correction coefficient. The method and the system can ensure the correction precision and reduce the correction error on the basis of high efficiency and high resolution, thereby ensuring the consistent sensitivity of each position of the panel.
Description
Technical Field
The invention belongs to the field of electronic equipment panels, and particularly relates to a pressure correction method and system for a capacitive pressure sensing panel.
Background
When the capacitive pressure sensing panel is stressed, the physical deformation is generated by pressure, the distance change is generated in the vertical direction of the parallel plate capacitor, and the distance change generated by the same pressure pressing at different positions is different, so that the capacitance variation actually output by each part has larger difference, as shown in fig. 1, fig. 1 is a schematic diagram of the distance change generated by the same force at different positions of the capacitive pressure sensing panel, it can be seen that the deformation generated at the central part is the largest, and the closer to the edge, the smaller the generated deformation is, and the higher the sensitivity of the edge of the panel relative to the pressure at the central part is, for example, when the pressure of the panel applied to a mobile phone is not corrected, the sensitivity in the middle of the panel is higher than the sensitivity of the edge.
The pressure correction method adopted in the prior art comprises the following steps: (1) partitioning the whole screen data, and partitioning and packaging all data sources of the panel into n × m data arrays; (2) collecting data from each packed data (hereinafter referred to as Group); (3) when the panel is pressed by an external force, distance calculation is carried out through the pressing position and each Group actual sampling position, an approximate coefficient needing to be compensated of the pressing point is calculated through weight, and a corrected pressure value is obtained.
The existing pressure correction method divides and packs original hundreds of data sources into n x m data arrays so as to cause precision loss; moreover, after data is packed, the characteristic points are fewer, the resolution is low, sampling needs to be carried out once per Group, the requirement on the acquisition position is high, the sampling flexibility is low, and the acquisition position needs to acquire the Group central point if necessary; if the data of other points are calculated by weighting the distances, and if the acquired positions have deviation, the correction result has errors, and the accuracy is about 50%.
Disclosure of Invention
In order to solve the above problems, the present invention provides a pressure calibration method and system for a capacitive pressure sensing panel, which can ensure calibration accuracy and reduce calibration errors on the basis of high efficiency and high resolution, thereby ensuring consistent sensitivity of each position of the panel.
The invention provides a pressure correction method of a capacitive pressure sensing panel, which comprises the following steps:
scribing with a first preset pressure on the surface of the capacitive pressure sensing panel, and collecting capacitance change data of a region scribed by the scribing lines;
restoring first capacitance change data of any point on the whole panel by using the capacitance change data of the line-drawn area;
determining a first correction coefficient of any point on the panel according to the actual position of the point, wherein the first correction coefficient is used for enabling the corrected pressure values output by any point of the whole panel under the first preset pressure to be equal;
when any point of the panel is pressed by an external force smaller than the first preset pressure, a first correction coefficient corresponding to the point is extracted, and the pressure value corrected by the point is output by using the first correction coefficient.
Preferably, in the pressure correction method for the capacitive pressure sensing panel, the surface of the capacitive pressure sensing panel is scribed with a first preset pressure, and the acquiring of the capacitance change data of the region scribed with the line is as follows:
the capacitance change data of the area marked by the lines is collected on the surface of the capacitance type pressure sensing panel in a one-stroke marking mode under the first preset pressure.
Preferably, in the pressure correction method for a capacitive pressure sensing panel, the restoring, by using the capacitance change data of the area marked by the line, first capacitance change data of any point on the entire panel is:
and restoring the first capacitance change data of any point on the whole panel by utilizing the capacitance change data of the area crossed by the line by utilizing a polynomial interpolation fitting algorithm.
Preferably, in the pressure correction method of the capacitive pressure sensitive panel, when any one point of the panel is pressed by an external force smaller than the first preset pressure, the first correction coefficient corresponding to the point is extracted, and the pressure value corrected at the point is output by using the first correction coefficient:
outputting the pressure value corrected by the point by using a formula ForceData (SRC TAG1/TAB 1), wherein ForceData is the corrected pressure value, TAG1 is a preset correction normalization value corresponding to the first preset pressure, SRC is a stress value generated by the panel when the panel is pressed by the external force, and TAB1 is the first correction coefficient corresponding to the point.
Preferably, in the pressure correction method of the capacitive pressure sensing panel, after determining the first correction coefficient of any point on the panel according to the actual position of the point, the method further includes:
scribing a line on the surface of the capacitive pressure sensing panel at a second preset pressure which is greater than the first preset pressure, and collecting capacitance change data of a region where the second preset pressure scribing line passes;
the collected capacitance change data of the passing area of the second preset pressure scribing line is utilized to restore the second capacitance change data of any point on the whole panel;
determining a second correction coefficient of any point on the panel according to the actual position of the point, wherein the second correction coefficient is used for enabling the corrected pressure values output by any point of the whole panel under the second preset pressure to be equal;
when any point of the panel is pressed by an external force between the first preset pressure and the second preset pressure, the first correction coefficient and the second correction coefficient corresponding to the point are extracted, and the pressure value corrected by the point is output by using the first correction coefficient and the second correction coefficient.
Preferably, in the pressure correction method of the capacitive pressure sensing panel, the outputting of the pressure value corrected at the point by using the first correction coefficient and the second correction coefficient is:
outputting the corrected pressure value of the point by using a formula ForceData (TAG 1+ (SRC-TAB 1) × TAG1/(TAB 2-TAB 1), wherein ForceData is the corrected pressure value, TAG1 is a preset correction normalization value corresponding to the first preset pressure, SRC is a stress value generated by the panel when the panel is pressed by the external force, TAB1 is the first correction coefficient corresponding to the point, and TAB2 is the second correction coefficient corresponding to the point.
Preferably, in the pressure correction method of the capacitive pressure sensing panel, when any point of the panel is pressed by an external force greater than the second preset pressure, a pressure value corrected by the point is set as a preset correction normalization value corresponding to the second preset pressure.
The invention provides a pressure correction system of a capacitive pressure sensing panel, which comprises:
the acquisition unit is used for scribing on the surface of the capacitive pressure sensing panel by first preset pressure and acquiring capacitance change data of a region scribed by the lines;
the restoring unit is used for restoring first capacitance change data of any point on the whole panel by using the capacitance change data of the area crossed by the lines;
the correction coefficient determining unit is used for determining a first correction coefficient of any point on the panel according to the actual position of the point, wherein the first correction coefficient is used for enabling corrected pressure values output by any point of the whole panel under the first preset pressure to be equal;
and the correcting unit is used for extracting a first correction coefficient corresponding to any point when the panel is pressed by an external force smaller than the first preset pressure, and outputting a pressure value corrected by the point by using the first correction coefficient.
Preferably, in the pressure correction system of the capacitive pressure sensing panel, the acquisition unit is configured to acquire capacitance change data of an area marked by a line on the surface of the capacitive pressure sensing panel by using a first preset pressure in a one-stroke marking manner.
Preferably, in the pressure correction system of the capacitive pressure sensing panel, the reduction unit is configured to reduce the first capacitance change data of any point on the entire panel by using a polynomial interpolation fitting algorithm and using the capacitance change data of the area marked by the line.
As can be seen from the above description, according to the pressure correction method and system for the capacitive pressure sensing panel provided by the present invention, the method includes marking a line on the surface of the capacitive pressure sensing panel with a first preset pressure, and acquiring capacitance change data of a region marked by the line; restoring first capacitance change data of any point on the whole panel by using the capacitance change data of the line-drawn area; determining a first correction coefficient of any point on the panel according to the actual position of the point, wherein the first correction coefficient is used for enabling the corrected pressure values output by any point of the whole panel under the first preset pressure to be equal; when any point of the panel is pressed by an external force smaller than the first preset pressure, a first correction coefficient corresponding to the point is extracted, and a pressure value corrected by the point is output by using the first correction coefficient, so that the correction precision can be ensured on the basis of high efficiency and high resolution, the correction error is reduced, and the consistency of the sensitivity of each position of the panel is ensured.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of distance variation of capacitive pressure sensing panel at different positions under the same force;
fig. 2 is a schematic diagram illustrating a pressure calibration method for a capacitive pressure sensing panel according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a first stroke method for acquiring capacitance variation data;
FIG. 4 is a schematic diagram of a second one-stroke method for acquiring capacitance variation data;
FIG. 5 is a schematic diagram of first capacitance change data on a panel recovered using a polynomial difference fitting algorithm;
FIG. 6 is a schematic diagram showing a comparison of pressure values before and after correction;
fig. 7 is a schematic diagram of a pressure calibration system of a first capacitive pressure sensing panel according to an embodiment of the present disclosure;
FIG. 8 is a schematic view of a first case of panel pressure correction;
FIG. 9 is a diagram illustrating a second case of panel pressure correction.
Detailed Description
The core idea of the invention is to provide a pressure correction method and system for a capacitive pressure sensing panel, which can ensure correction precision and reduce correction errors on the basis of high efficiency and high resolution, thereby ensuring that the sensitivities of all the positions of the panel are consistent.
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.
Fig. 2 shows a first pressure calibration method for a capacitive pressure sensing panel provided in an embodiment of the present application, where fig. 2 is a schematic diagram of the first pressure calibration method for the capacitive pressure sensing panel provided in the embodiment of the present application, and the method includes the following steps:
s1: scribing with a first preset pressure on the surface of the capacitive pressure sensing panel, and collecting capacitance change data of a region scribed by the scribing lines;
it is emphasized here that this step does not use the dotting data acquisition method of the prior art, but uses the line marking method, which avoids the pressing and lifting movement of the acquisition part, thereby saving the data acquisition time. However, the sampling time and the calibration accuracy are mutually restricted, when the calibration accuracy is actually required to be higher, more data needs to be collected, which may cause efficiency reduction, and when the rapid test is actually required, some calibration accuracy needs to be reduced, so that specific parameters for sampling may be determined according to the actual needs, which is not limited herein.
A specific example of scribing sampling may be as shown in fig. 3, where fig. 3 is a schematic diagram of a first one-stroke scribing method for acquiring capacitance change data, it can be seen that a spiral scribing is performed from a center of a panel until the panel is scribed to an edge, and the whole scribing process does not need to leave the panel, so that a large part of data acquisition time is saved, which can improve data acquisition efficiency, of course, this is only one example, a one-stroke scribing method may also be as shown in fig. 4, fig. 4 is a schematic diagram of a second one-stroke scribing method for acquiring capacitance change data, which is not described herein again, and certainly, other methods besides one-stroke scribing may be employed here, which are not limited here, and a test machine required for the whole acquisition process may use an existing machine, without adding new equipment, and it should be noted that capacitance change data here may be the most direct data change after pressing the panel, collecting such raw data can be more advantageous for subsequent steps. However, it is not excluded that the capacitance change data acquired by scribing here may also be a value obtained by processing the original capacitance change data, but the capacitance change data and the actual capacitance change data are necessarily in a corresponding relationship.
S2: restoring first capacitance change data of any point on the whole panel by using the capacitance change data of the line-drawn area;
due to the limited scribe area, data cannot be collected for the entire area, for example: only 9 x 15 data can be collected, so this step can obtain more data by a reduction method including a fitting method, that is, obtain the first capacitance variation data of any point on the panel.
S3: determining a first correction coefficient of any point on the panel according to the actual position of the point, wherein the first correction coefficient is used for enabling the corrected pressure values output by any point of the whole panel under the first preset pressure to be equal;
the first correction factors determined in this step form a table in which any point on the panel has a corresponding first correction factor.
S4: when any point of the panel is pressed by an external force smaller than the first preset pressure, a first correction coefficient corresponding to the point is extracted, and the pressure value corrected by the point is output by using the first correction coefficient.
For example, if the third row and the tenth column are pressed, the first correction coefficient corresponding to the position is found from the table, so that the output pressure value can be corrected, and the sensitivity of any position of the panel is the same.
As can be seen from the above description, in the pressure correction method for a capacitive pressure sensing panel provided in the embodiment of the present application, since the line is drawn at the first preset pressure on the surface of the capacitive pressure sensing panel, the capacitance change data of the area drawn by the line is collected; restoring first capacitance change data of any point on the whole panel by using the capacitance change data of the line-drawn area; determining a first correction coefficient of any point on the panel according to the actual position of the point, wherein the first correction coefficient is used for enabling the corrected pressure values output by any point of the whole panel under the first preset pressure to be equal; when any point of the panel is pressed by an external force smaller than the first preset pressure, a first correction coefficient corresponding to the point is extracted, and a pressure value corrected by the point is output by using the first correction coefficient, so that the correction precision can be ensured on the basis of high efficiency and high resolution, the correction error is reduced, and the consistency of the sensitivity of each position of the panel is ensured.
The second pressure correction method for the capacitive pressure sensing panel provided by the embodiment of the application is based on the pressure correction method for the capacitive pressure sensing panel, and further includes the following technical features:
the surface of the capacitive pressure sensing panel is scribed by first preset pressure, and the capacitance change data of the region scribed by the lines is acquired as follows:
the capacitance change data of the area marked by the lines is collected on the surface of the capacitance type pressure sensing panel in a one-stroke marking mode under the first preset pressure.
The third pressure correction method for the capacitive pressure sensing panel provided by the embodiment of the application is based on the pressure correction method for the capacitive pressure sensing panel, and further includes the following technical features:
the method for restoring the capacitance change data of any point on the whole panel by using the capacitance change data of the line-drawn area comprises the following steps:
and restoring the first capacitance change data of any point on the whole panel by utilizing the capacitance change data of the area crossed by the line by utilizing a polynomial interpolation fitting algorithm.
The optimal reduction effect can be achieved by using the algorithm, the data of the part which is not collected on the panel can be reduced by about 1% of channel data, the reduction effect of the polynomial difference fitting algorithm is smoother, the effect is shown in fig. 5, and fig. 5 is a schematic diagram of the first capacitance change data on the panel reduced by using the polynomial difference fitting algorithm.
A fourth pressure correction method for a capacitive pressure sensing panel provided in the embodiment of the present application is based on any one of the pressure correction methods for the capacitive pressure sensing panels of the first to third types, and further includes the following technical features:
when any point of the panel is pressed by an external force smaller than the first preset pressure, extracting the first correction coefficient corresponding to the point, and outputting a pressure value corrected by the point by using the first correction coefficient as follows:
outputting the pressure value corrected by the point by using a formula ForceData (SRC TAG1/TAB 1), wherein ForceData is the corrected pressure value, TAG1 is a preset correction normalization value corresponding to the first preset pressure, SRC is a stress value generated by the panel when the panel is pressed by the external force, and TAB1 is the first correction coefficient corresponding to the point.
Referring to fig. 8, fig. 8 is a schematic diagram of a first case of the panel pressure correction, and the above formula is illustrated by way of example:
(1) assuming that the stress value generated after the panel is subjected to the first preset pressure is 85, the system indexes that the corresponding TAB1 value (the first correction coefficient) is 85 according to the position of the pressing point, and the normalized value (the TAG1 value) preset for the pressing point is 100, then the pressure value after the point is corrected is obtained by using the above formula: ForceData 85 × 100/85 100 (refer to line L1 and point a).
(2) Assuming that the panel is subjected to a first predetermined pressure with a resulting stress value of 85, the system indexes a corresponding TAB1 value of 150 based on the location of the pressed point, and if the previously defined normalized value (TAG1 value) is 120, then the point is corrected to a pressure value of 150 using the above equation: ForceData 85 × 120/150 is 68 (refer to line L2 and point B).
(3) Assuming that the stress value generated after the panel is subjected to the first preset pressure is 78, the system will extract the index of the position of the pressed point to the corresponding TAB1 value of 85, and if the normalized value (TAG value) previously defined in TAB1 is 100, then using the above formula, the corrected pressure value of the point is ForceData 78 × 100/85 or 91.7 (refer to line L1 and point C).
It should be noted that, in the above formula, the normalization value (TAG1 value) is completely self-defined, that is, the TAG1 value can be normalized to any suitable value, which is not limited herein. Hundreds of channels are uniformly distributed on the panel, under a first preset pressure, an IC can acquire a pressure matrix consisting of hundreds of channels on the panel, X, Y and Z data sources of each point of the panel can form a three-dimensional curved surface, the conventional channels can be counted, and first capacitance change data can be obtained through steps of data whole surface counting, partial data counting, noise filtering and the like, wherein TAG1 is a user-defined normalization target value. If a panel is placed with a 100g weight (equivalent to the first preset pressure mentioned in this embodiment) and the stress value SRC of the pressed point of the panel to the 100g weight is 120(SRC statistics can add all or part of the surrounding channels), if TAG1 is set to 100, the final result of the point ForceData obtained by the above formula is 100 after having been stored in the chip Flash calculation.
After the fourth calibration method, the system can not only recognize the existence of pressure, but also enlarge or reduce the Forcedata value, and when it is desired to provide TAB with only one calibration force, the four calibration methods can be used. The overflow processing is performed at the pressure value exceeding the first pressing degree, the maximum Forcedata is directly corrected (refer to fig. 8), the current system bandwidth is usually set to 1Byte, the maximum Forcedata of 255 can be identified, and the Forcedata exceeding 255 is uniformly displayed as 255. In view of the foregoing, the present application provides a fifth method for pressure correction of a capacitive pressure sensing panel. When only one preset pressure is corrected, the accuracy of each part before the overflow processing of the corrected pressure value is consistent, the force difference between the common pressing strength and the common maximum pressing strength of the user is usually not large, the lower embodiment balances the interval smaller than the common pressing strength, and the reaction sensitivity of the panel in the interval between the common pressing strength and the common maximum pressing strength is balanced, and the embodiment further comprises the following technical characteristics on the basis of the pressure correction method of the fourth capacitive pressure sensing panel:
after determining the first correction coefficient of any point on the panel according to the actual position of the point, the method further comprises:
and scribing a line with a second preset pressure greater than the first preset pressure on the surface of the capacitive pressure sensing panel, and acquiring capacitance change data of a region where the second preset pressure scribing line passes through, wherein the two preset pressures can be determined according to actual needs, for example, the commonly used pressing degree of a user is taken as the first preset pressure, and the commonly used maximum pressing degree of the user is taken as the second preset pressure.
The collected capacitance change data of the passing area of the second preset pressure scribing line is utilized to restore the second capacitance change data of any point on the whole panel;
determining a second correction coefficient of any point on the panel according to the actual position of the point, wherein the second correction coefficient is used for enabling the corrected pressure values output by any point of the whole panel under the second preset pressure to be equal;
when any point of the panel is pressed by an external force between the first preset pressure and the second preset pressure, the first correction coefficient and the second correction coefficient corresponding to the point are extracted, and the pressure value corrected by the point is output by using the first correction coefficient and the second correction coefficient.
The pressure correction method for the capacitive pressure sensing panel provided by the embodiment of the application is based on the pressure correction method for the fifth capacitive pressure sensing panel, and further includes the following technical features:
the outputting the pressure value corrected by the point by using the first correction coefficient and the second correction coefficient is as follows:
outputting the corrected pressure value of the point by using a formula ForceData (TAG 1+ (SRC-TAB 1) × TAG1/(TAB 2-TAB 1), wherein ForceData is the corrected pressure value, TAG1 is a preset correction normalization value corresponding to the first preset pressure, SRC is a stress value generated by the panel when the panel is pressed by the external force, TAB1 is the first correction coefficient corresponding to the point, and TAB2 is the second correction coefficient corresponding to the point.
Referring to fig. 9, fig. 9 is a schematic diagram of a second case of panel pressure correction, and the following describes the above steps by way of specific example:
let TAB1 be the matrix formed by data collected and fitted by the panel at the first preset pressure value of 200g, and TAB2 be the matrix formed by data collected and fitted by the panel at the second preset pressure value of 500 g.
Assuming that the TAB1 value mapped by the pressed point with an external force of 200g is 150, the TAG1 value is set 255/2, which in this embodiment is equal to 125 (point a in fig. 9), the TAB2 value mapped by the pressed point with an external force of 500g is 200, and the TAG2 value is set 255 (point B in fig. 9).
Assuming that the external force is 300g (500g >300g >200g) and the stress value SRC is 170, the data are entered:
ForceData＝(255/2)+(170-150)*(255/2)/(200-150)＝178.5
assuming that the given external force value is exactly 500g, the normalized value of the panel at the moment is 200 in the ideal state, and ForceData is (255/2) + (200-.
This example equalizes the panel response sensitivity in the region of less than the usual degree of pressure (origin-point a), the force between the usual degree of pressure and the usual maximum degree of pressure (point a-point B).
The effect obtained by the correction process of each example is shown in fig. 6, fig. 6 is a comparison schematic diagram of pressure values before and after correction, in this case, we capture data of 15 points uniformly distributed on the panel, the lower part is data before correction, the upper part is data after correction, and it can be seen that the consistency under the same pressure after correction is more than 95%.
The seventh pressure correction method for a capacitive pressure sensing panel provided in the embodiment of the present application is based on the pressure correction method for the fifth capacitive pressure sensing panel, and further includes the following technical features:
and when any point of the panel is pressed by an external force larger than the second preset pressure, setting the pressure value corrected by the point as a preset correction normalization value corresponding to the second preset pressure.
This is an over-limit condition, if the panel can withstand 1000g, but if the application uses 500g, then the calibration is set such that the 200g correction is normalized to 150, and the 500g correction to 255, since 255 is a limit, the greater force is directly attributed to 255.
Fig. 7 shows a pressure calibration system of a first capacitive pressure sensing panel provided in an embodiment of the present application, where fig. 7 is a schematic diagram of the pressure calibration system of the first capacitive pressure sensing panel provided in the embodiment of the present application, and the system includes:
the acquisition unit 701 is used for scribing on the surface of the capacitive pressure sensing panel by using first preset pressure and acquiring capacitance change data of a region which is scribed by lines, the scheme abandons a dotting data acquisition mode in the prior art and adopts a scribing mode, so that the pressing and lifting movement of an acquisition part is avoided, the data acquisition time is saved, the sampling time and the correction precision are mutually restricted, when the actual requirement is higher in correction precision, more data need to be acquired, the efficiency is reduced, and when the actual requirement is fast tested, some correction precisions need to be reduced, so that the concrete sampling parameters can be determined according to the actual requirement, and the situation is not limited;
the restoring unit 702 is configured to restore the first capacitance change data at any point on the whole panel by using the capacitance change data of the area scribed by the line, where it should be noted that the actual capacitance change data acquired by scribing here may also be a value processed by the capacitance change data, but the actual capacitance change data and the actual capacitance change data are necessarily in a corresponding relationship, and because the scribing area is limited, data of all areas cannot be acquired, for example: only 9 x 15 data can be collected, so that more data need to be recovered, for example, 18 x 30 data are generated, and 18 x 30 data are formed into a matrix, that is, the first capacitance change data;
a correction coefficient determining unit 703, configured to determine a first correction coefficient of any point on the panel according to an actual position of the point, where the first correction coefficient is used to equalize corrected pressure values output by the point under the first preset pressure, and the determined first correction coefficient forms a table, where each point in the table has a corresponding first correction coefficient, and the link is generally placed in a factory for panel production to perform data acquisition and is recorded in an IC, so that after each panel leaves a factory, the table with the first correction coefficient is already in the interior of the panel;
a correcting unit 704, configured to, when any point of the panel is pressed with an external force smaller than the first preset pressure, extract a first correction coefficient corresponding to the point, output a pressure value corrected by the point using the first correction coefficient, and if the tenth column in the third row is pressed, find out the first correction coefficient corresponding to the point from the table, so as to correct the pressure value, so that any position of the panel has a sensitivity of the same magnitude.
The pressure correction system of the second capacitive pressure sensing panel provided by the embodiment of the application is based on the pressure correction system of the first capacitive pressure sensing panel, and further comprises the following technical characteristics:
the acquisition unit is used for acquiring capacitance change data of an area marked by lines on the surface of the capacitive pressure sensing panel in a one-stroke marking mode at a first preset pressure.
In this case, the whole scribing process does not need to leave the panel, so a large part of time is saved, and the data acquisition efficiency is improved.
The third pressure correction system for a capacitive pressure sensing panel provided in the embodiment of the present application is based on the pressure correction system for a capacitive pressure sensing panel, and further includes the following technical features:
the reduction unit is used for reducing the first capacitance change data of any point on the whole panel by using a polynomial interpolation fitting algorithm and using the capacitance change data of the area crossed by the line.
The optimal reduction effect can be achieved by using the algorithm, the part which is not collected is reduced by about 1% of channel data, and the polynomial difference fitting algorithm is more smooth compared with a linear interpolation algorithm.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A pressure correction method of a capacitive pressure sensing panel is characterized by comprising the following steps:
scribing with a first preset pressure on the surface of the capacitive pressure sensing panel, and collecting capacitance change data of a region scribed by the scribing lines;
restoring first capacitance change data of any point on the whole panel by using the capacitance change data of the line-drawn area;
determining a first correction coefficient of any point on the panel according to the actual position of the point, wherein the first correction coefficient is used for enabling the corrected pressure values output by any point of the whole panel under the first preset pressure to be equal;
when any point of the panel is pressed by an external force smaller than the first preset pressure, extracting a first correction coefficient corresponding to the point, and outputting a pressure value corrected by the point by using the first correction coefficient;
when any point of the panel is pressed by an external force smaller than the first preset pressure, extracting the first correction coefficient corresponding to the point, and outputting a pressure value corrected by the point by using the first correction coefficient as follows:
outputting the pressure value corrected by the point by using a formula ForceData (SRC TAG1/TAB 1), wherein ForceData is the corrected pressure value, TAG1 is a preset correction normalization value corresponding to the first preset pressure, SRC is a stress value generated by the panel when the panel is pressed by the external force, and TAB1 is the first correction coefficient corresponding to the point.
2. The pressure calibration method of the capacitive pressure sensing panel according to claim 1, wherein the surface of the capacitive pressure sensing panel is scribed with a first preset pressure, and the capacitance variation data of the area scribed by the scribe lines is collected as:
the capacitance change data of the area marked by the lines is collected on the surface of the capacitance type pressure sensing panel in a one-stroke marking mode under the first preset pressure.
3. The pressure calibration method of the capacitive pressure sensing panel according to claim 1, wherein the step of restoring the first capacitance variation data of any point on the whole panel by using the capacitance variation data of the area marked by the line is as follows:
and restoring the first capacitance change data of any point on the whole panel by utilizing the capacitance change data of the area crossed by the line by utilizing a polynomial interpolation fitting algorithm.
4. The pressure correction method of the capacitive pressure sensing panel according to claim 1,
after determining the first correction coefficient of any point on the panel according to the actual position of the point, the method further comprises:
scribing a line on the surface of the capacitive pressure sensing panel at a second preset pressure which is greater than the first preset pressure, and collecting capacitance change data of a region where the second preset pressure scribing line passes;
the collected capacitance change data of the passing area of the second preset pressure scribing line is utilized to restore the second capacitance change data of any point on the whole panel;
determining a second correction coefficient of any point on the panel according to the actual position of the point, wherein the second correction coefficient is used for enabling the corrected pressure values output by any point of the whole panel under the second preset pressure to be equal;
when any point of the panel is pressed by an external force between the first preset pressure and the second preset pressure, the first correction coefficient and the second correction coefficient corresponding to the point are extracted, and the pressure value corrected by the point is output by using the first correction coefficient and the second correction coefficient.
5. The pressure correction method of the capacitive pressure sensing panel according to claim 4,
the step of outputting the pressure value after the point correction by using the first correction coefficient and the second correction coefficient is as follows:
outputting the corrected pressure value of the point by using a formula ForceData (TAG 1+ (SRC-TAB 1) × TAG1/(TAB 2-TAB 1), wherein ForceData is the corrected pressure value, TAG1 is a preset correction normalization value corresponding to the first preset pressure, SRC is a stress value generated by the panel when the panel is pressed by the external force, TAB1 is the first correction coefficient corresponding to the point, and TAB2 is the second correction coefficient corresponding to the point.
6. The pressure correction method of the capacitive pressure sensing panel according to claim 4,
and when any point of the panel is pressed by an external force larger than the second preset pressure, setting the pressure value corrected by the point as a preset correction normalization value corresponding to the second preset pressure.
7. A pressure correction system for a capacitive pressure sensitive panel, comprising:
the acquisition unit is used for scribing on the surface of the capacitive pressure sensing panel by first preset pressure and acquiring capacitance change data of a region scribed by the lines;
the restoring unit is used for restoring first capacitance change data of any point on the whole panel by using the capacitance change data of the area crossed by the lines;
the correction coefficient determining unit is used for determining a first correction coefficient of any point on the panel according to the actual position of the point, wherein the first correction coefficient is used for enabling corrected pressure values output by any point of the whole panel under the first preset pressure to be equal;
the correction unit is used for extracting a first correction coefficient corresponding to any point when the panel is pressed by an external force smaller than the first preset pressure, and outputting a pressure value corrected by the point by using the first correction coefficient;
the correction unit outputs the corrected pressure value of the point by using a formula ForceData SRC TAG1/TAB1, wherein ForceData is the corrected pressure value, TAG1 is a preset correction normalization value corresponding to the first preset pressure, SRC is a stress value generated by the panel when the panel is pressed by the external force, and TAB1 is the first correction coefficient corresponding to the point.
8. The pressure calibration system of the capacitive pressure sensing panel according to claim 7, wherein the collecting unit is configured to collect capacitance variation data of an area marked by a line on the surface of the capacitive pressure sensing panel by a stroke at a first preset pressure.
9. The system of claim 7, wherein the recovery unit is configured to recover the first capacitance variation data at any point of the entire panel by using a polynomial interpolation fitting algorithm and using the capacitance variation data of the area crossed by the line.
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| CN201710494330.4A CN109117014B (en) | 2017-06-26 | 2017-06-26 | Pressure correction method and system for capacitive pressure sensing panel |
| TW106136266A TWI639109B (en) | 2017-06-26 | 2017-10-20 | A pressure correction method and a pressure correction system for a capacitive pressure sensing panel |
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| CN110427126B (en) * | 2019-08-07 | 2020-11-03 | 北京航空航天大学 | Pressure signal correction method and device |
| CN113419646B (en) * | 2021-06-03 | 2023-05-16 | 维沃移动通信有限公司 | Calibration method and device of pressure sensing channel and electronic equipment |
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