CN103197811A - Hybrid type non-common ground compensation method of touch panel - Google Patents

Abstract

The present invention discloses a hybrid non-common ground compensation method for a touch panel. The method includes: obtaining a mutual capacitance sensing frame and a self-capacitance sensing frame, and using the sensing of the touch sensing group of the mutual capacitance sensing frame. Read the sensing values of the corresponding rows and columns of the self-capacitive sensing frame at the rows and columns of the point, and then average the sensing values of the corresponding rows and columns of the self-capacitive sensing frame, and use the average sensing value as the corresponding touch sensing The sensing value of the group is used for compensation; since the self-capacitive sensing frame is not easily affected by the common ground, the sensing values of the rows and columns of the self-capacitive sensing frame are used as the sensing values of the common ground in the mutual capacitive sensing frame. The sensing value of the point can effectively compensate for the sensing value that is destroyed due to the mutual capacitance sensing frame not being connected to the same ground.

Description

Hybrid Uncommon Ground Compensation Method for Touch Panel

technical field

The invention relates to a compensation method for uncommon ground of a touch panel, in particular to a touch panel hybrid that can effectively solve the abnormal sensing phenomenon of a capacitive touch panel due to uncommon ground and misjudgment of a touched object. The compensation method of non-common ground.

Background technique

The main touch principle of the capacitive touch panel is to change the capacitance change value of the touched position of the capacitive touch panel through the static electricity of the human body, and then identify the user's touch position through the capacitance change value; in order to effectively respond to the static signal of the human body Generally, the metal shell of the electronic device using the capacitive touch panel will be connected to the ground signal of the capacitive touch panel to form a common ground electrical structure relationship, so that the user's hand will definitely touch the metal shell.

At present, due to the increasing popularity of touch-sensitive tablet computers or smart phones with large-size panels, users may only touch the touch panels of these electronic devices with fingers or palms, and cannot share the same ground with them; , it will cause abnormal capacitance change value in the non-common ground mode.

Please refer to FIG. 8, which is a mutual capacitive sensing frame 10 obtained by mutual capacitive scanning of a capacitive touch panel in a floating mode. It can be seen from the figure that the mutual capacitive sensing Frame 10 reflects the touch sensing group of a single touch object 30, and the sensing value of the middle sensing point should be the maximum value originally, so as to correctly identify the coordinates of the touch object, but it does not share the same ground so that it can sense Values of 0 and 15 (hexadecimal) will decrease, and the correct coordinates cannot be correctly identified. It can be seen that the sensing value of the mutual-capacity sensing frame 10 using mutual-capacity scanning in the non-common-ground mode will be damaged, which will affect the correctness of coordinate interpretation.

From the above description, it can be seen that the current mutual capacitance sensor frame is indeed prone to errors when the touch panel is in the non-common ground mode for the coordinate recognition of the touched object. Therefore, the mutual capacity sensor frame must be destroyed before the coordinate recognition is performed. Compensate the sensing value to avoid false coordinates.

Contents of the invention

In view of the technical shortcomings of the high error rate of the uncommon ground pattern recognition technology of the above-mentioned capacitive touch panel, the main purpose of the present invention is to provide a hybrid uncommon ground compensation method to avoid the coordinates of the touched object caused by the uncommon ground Misjudgment.

The main technical means used to achieve the above purpose is to make the hybrid non-common ground compensation method of the touch panel include:

Obtain mutual-capacity sensor frame and self-capacity sensor frame;

Read the sensing value of the corresponding row and column in the self-capacity sensing frame with the row and column of the sensing point in the touch sensing group of the mutual-capacity sensing frame, and take the corresponding row, Averaging of the induction values of the columns to obtain the average induction value;

The average sensing value is used as the sensing value of the sensing point in the touch sensing group of the mutual capacitance sensing frame.

The above-mentioned present invention mainly uses the characteristics that the self-capacitance sensing frame is not easily affected by non-common ground, and uses the sensing values of the rows and columns of the self-capacitating sensing frame as the sensing values of the sensing points in the mutual-capacitance sensing frame to compensate , to avoid the error rate of subsequent coordinate judgment.

Description of drawings

Fig. 1 is the flowchart of the first preferred embodiment of the hybrid non-common ground compensation method of the present invention;

Figure 2 is a mutual-capacitance sensing frame and a self-capacitance sensing frame obtained by mutual-capacitance and self-capacity scanning of a touch panel in the non-common ground mode, wherein the self-capacitance sensing frame only includes part of the row , column induction signal;

Fig. 3 is the mutual capacitance sensing frame after performing non-common ground compensation with the mutual capacitance sensing frame of Fig. 2;

Fig. 4 is a flow chart of the second preferred embodiment of the hybrid non-common ground compensation method of the present invention;

Fig. 5 is the mutual capacitive sensing frame after the non-common ground compensation is performed on the first sensing point to be compensated in the mutual capacitive sensing frame of Fig. 2;

6A to 6D are flow charts of a cross judgment program;

Fig. 7 is the mutual-capacitance sensing frame after the non-common ground compensation is performed on the second sensing point to be compensated in the mutual-capacitance sensing frame of Fig. 2;

Fig. 8 is a mutual-capacitance sensing frame and a self-capacitance scanning frame for a touch panel scanning and reading in a non-common ground mode, and a self-capacitance scanning frame for scanning and reading in a common ground mode, wherein the self-capacitance The type sensing frame only includes part of the row and column sensing signals.

Detailed ways

The technical means adopted by the present invention to achieve the intended invention purpose are further described below in conjunction with the drawings and preferred embodiments of the present invention.

First, please refer to FIG. 1 , which is a flow chart of a first preferred embodiment of a hybrid non-common ground compensation method for a touch panel of the present invention. The hybrid non-common ground compensation method includes:

Obtain the mutual-capacitance sensing frame and the self-capacitance sensing frame, and preset a counting threshold S10;

Read the sensing value of the corresponding row and column in the self-capacity sensing frame with the sensing point row and column of each touch sensing group of the mutual-capacity sensing frame, and take the corresponding row, Average the sensing values of the columns to obtain the average sensing value S11;

The average sensing value is taken as the sensing value S12 of the sensing point of the touch sensing group of the mutual capacitive sensing frame.

Please refer to FIG. 8 , the self-capacitance sensing frame 20 obtained by self-capacity scanning respectively under the common-ground mode and the non-common-ground mode, as can be seen from the figure, in the common-ground mode and the non-common-ground mode The difference in sensing signals obtained by scanning Y4' and Y4 in the same row and X4' and X4 in the same row is only that the sensing value of the non-common ground mode is slightly lower than the sensing value of the common ground mode as a whole, but the peak value sensed by the corresponding touching object 30 is still Maintaining the positive value and the maximum value does not hinder the correctness of the coordinate recognition of the touch object 30; therefore, the present invention uses the self-capacitance frame 20 as the sensing value of the sensing point of the compensation mutual-capacity frame 10, which can indeed correct the mutual capacitance Compensate for the non-common ground sensing point in frame 10 of the formula.

Please refer to FIG. 2, which is a mutual-capacity sensing frame 10 obtained under the non-communal ground mode, which includes a touch sensing group, which is composed of 13 sensing points, and the sensing values of the two middle sensing points (0 , 15) (hexadecimal) is affected by the non-common ground and the sensing value is lower than other sensing points, so it is the non-common ground sensing point 101. The process of compensating the touch sensing group will be described in detail below.

Since the self-capacitance sensing frame 20 includes the inductance values of all rows and columns of the touch panel, the self-capacitance can be read by each sensing point row and column of the touch sensing group through the compensation method of the present invention. The sensing value corresponding to the row and column in the self-capacity sensing frame 20 is averaged to obtain the average sensing value after averaging the sensing values corresponding to the row and column in the self-capacity sensing frame 20, so as to correspond to the sensing value as the sensing point; , as shown in Figure 2, read the corresponding row, column Y4, X4/ The induction value (100, 100) (100, 100) of Y5, X4 is taken from the induction value (100, 100) (100, 100) of the corresponding row and column Y4, X4/Y5, X4 of the capacitive frame 20 Average value, obtain the average induction value (100, 100), and then use the average induction value (100, 100) as the original induction value (0, 15) to compensate for the two non-common induction points 101, and after compensation The touch sensing group is shown in FIG. 3 .

Furthermore, in order to speed up the compensation of the sensing point 101 that is not grounded, the sensing point to be compensated can be further selected in the above step S11, and only the row and column of the sensing point to be compensated can be used to read the self-capacitance sensing frame 20 Inductive values corresponding to rows and columns. There are several ways to select the sensing point to be compensated:

1. Preset a critical count value, and count the number of sensing points whose peripheral sensing values are higher than that of each sensing point in the touch sensing group. If it is judged that the critical count value has been reached, select the sensing point to be compensated.

2. Preset a critical count value, and count the number of sensing points whose peripheral sensing value is lower than that of each sensing point in the touch sensing group, and if it is judged that the critical count value has been reached, select as the sensing point to be compensated.

In addition, please refer to Figure 4 and Figure 5, which is another preferred embodiment of the present invention, which includes:

Obtain the mutual-capacity sensing frame 10 and the self-capacity sensing frame 20, and preset a sensing threshold S10';

Determine the first sensing point 102 to be compensated, compare the sensing values of the sensing points of the mutual capacitance sensing frame 10, and determine the sensing point whose sensing value is greater than the sensing critical value is the first sensing point 102, S11'; wherein the The sensing threshold is higher than the general noise value to avoid including noise in the first compensation sensing point;

Read the sensing value of the corresponding row and column of the self-capacity sensing frame 20 with the row and column of each first sensing point 102 to be compensated, as shown in Figure 2, and take the corresponding row, column of the self-capacity sensing frame 20 After the average sensing value of the column, the average sensing value corresponding to the row and column of the self-capacitance sensing frame 20 corresponds to the sensing value S12' of the first sensing point to be compensated;

Determine the second sensing point 103 to be compensated, and determine the sensing point S13' that has not been compensated in the touch sensing group;

Read the sensing value of the corresponding row and column of the self-capacity sensing frame 20 with the row and column of each second sensing point 103 to be compensated, as shown in Figure 2, and take the corresponding row, column and column of the self-capacity sensing frame 20 After the sensing values of the columns are averaged, the average sensing values corresponding to the rows and columns of the self-capacitance sensing frame 20 are correspondingly used as the sensing value S14 ′ of the second sensing point 103 to be compensated.

The above-mentioned second to-be-compensated sensing point 103 adopts a cross judgment procedure, which means that a critical number is preset first, and the sensing values of all sensing points of the touch sensing group are respectively compared with the sensing values of the upper, lower, left, and right sensing points. Values are compared, and the number of sensing values of the upper, lower, left, and right sensing points of each sensing point is greater than the sensing value of the current sensing point is counted, and it is judged whether the total number exceeds the critical number; if it exceeds, it means The current sensing point has not been compensated and is regarded as the second sensing point to be compensated 103 .

In the following, I will further illustrate the detailed compensation process of the above-mentioned embodiment with examples. First, please refer to FIG. 5 and FIG. The sensing values 0 and 15 (hexadecimal) of the two intermediate sensing points are lower than the sensing values of other sensing points, so they are sensing points without a common ground.

Assuming that the preset sensing critical value is 10, all the sensing values of the touch sensing group except the sensing points with a sensing value of 0 are the first sensing points to be compensated 102, after determining the first sensing points to be compensated 102 , that is, read the corresponding row Y4 and column X4 sensing values from the self-contained sensing frame 20 according to each of the first sensing points 102 to be compensated, as shown in Figure 2, and after averaging them, the average sensing value The value corresponds to the original sensing value of the first sensing point 102 to be compensated. As shown in Figure 5, the first sensing point 102 to be compensated of the mutual capacitance sensing frame 10 is compensated, except for the sensing point with a sensing value of 0; All the sensing points of the sensing group are inspected, as shown in FIG. 6A to FIG. 6D , there are 12 sensing points in this example, so 12 detections are performed. Assuming that the critical number is 4, it is judged that the sensing values of the four sensing points above, below, left, and right of the sensing point with a sensing value of 0 are larger than the sensing point, that is, the critical count is satisfied, and the sensing value is set to be 0 The sensing point is the second sensing point 103 to be compensated, and compensation is performed, so that compensation can be avoided for the sensing points of the non-touch sensing group in the mutual capacitance sensing frame 10, such as the noise sensing point 104 in FIG. 5 . Therefore, read the sensing values of the corresponding row, column Y4, and X4 from the self-capacitance sensing frame 20 with the row, column Y4, and X4 of the sensing point whose sensing value is 0, and take the average and divide the original sensing value 0 is rewritten as 100, as shown in Figure 7, all the sensing points of the touch sensing group of the mutual-capacity sensing frame 10 are compensated with the sensing value of the self-capacitance sensing frame 20, since the self-capacitance sensing The frame 20 is less affected by the uncommon ground, so the compensated mutual-capacity sensing frame 10 can correctly identify the coordinates of the touched object.

To sum up, the present invention can indeed compensate the touch sensing group read in the non-grounding mode, so that the sense value of the damaged touch sensing group returns to the sensing value close to the grounding mode, so as to facilitate subsequent The step of determining the coordinates of the touch position; this also means that the user does not need to touch the electronic device (common ground mode) using the capacitive touch panel, and can correctly determine the touch position of the user's finger, so as to avoid restricting the user usage habits.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this professional technology Personnel, without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or modifications to equivalent embodiments with equivalent changes, but all the content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solution of the present invention.

Claims (8)

1. A hybrid non-common ground compensation method for a touch panel, characterized in that, the method comprises: Obtain mutual-capacity sensor frame and self-capacity sensor frame; Read the sensing values of the corresponding rows and columns in the self-capacity sensing frame with the rows and columns of the sensing points in the touch sensing group of the mutual-capacity sensing frame, and take the corresponding values in the self-capacity sensing frame. The average of the induction values of rows and columns to obtain the average induction value; The average sensing value is used as the sensing value of the sensing point in the touch sensing group of the mutual capacitive sensing frame. 2. The hybrid non-common ground compensation method of the touch panel according to claim 1, characterized in that, the row and column of the sensing points in the touch sensing group of the mutual capacitance sensing frame are used to read the In the step of sensing values corresponding to rows and columns in the self-capacity sensing frame, further read the sensing values corresponding to rows and columns in the self-capacity sensing frame with the rows and columns of all sensing points of each touch sensing group value. 3. The hybrid non-common ground compensation method for touch panel according to claim 1, characterized in that, the plurality of rows and columns corresponding to each touch sensing group of the mutual capacitance sensing frame are read out. The step of describing the sensing values corresponding to rows and columns in the self-capacity sensing frame further includes: A counting threshold is preset; Selecting the sensing point to be compensated is to judge that the number of sensing points whose peripheral sensing value is higher than that of each sensing point of each touch sensing group has reached the counting critical value, then it is selected as the sensing point to be compensated; The sensing values corresponding to the rows and columns of the self-capacity sensing frame are read by the rows and columns of the sensing points to be compensated. 4. The hybrid non-common-ground compensation method for a touch panel according to claim 1, wherein the multiple rows and columns corresponding to each touch-sensing group of the mutual-capacitance sensing frame are read out. The step of describing the sensing values corresponding to rows and columns in the self-capacity sensing frame further includes: A counting threshold is preset; Select the sensing point to be compensated, and judge that the number of sensing points whose peripheral sensing value is lower than that of each sensing point of each touch sensing group has reached the counting critical value, then select it as the sensing point to be compensated; The sensing values corresponding to the rows and columns of the self-capacity sensing frame are read by the rows and columns of the sensing points to be compensated. 5. A hybrid non-common ground compensation method for a touch panel, characterized in that the method comprises: Obtain the mutual-capacitance sensing frame and the self-capacitance sensing frame, and preset a sensing threshold; Determine the first sensing point to be compensated, compare the sensing values of each sensing point in the mutual capacitance sensing frame, and determine that the sensing point whose sensing value is greater than the sensing critical value is the first sensing point for compensation; Reading the sensing values corresponding to the rows and columns of the self-capacity sensing frame with the rows and columns of the first sensing points to be compensated, and taking the average of the sensing values corresponding to the rows and columns of the self-capacitance sensing frame, Taking the average sensing value of the corresponding row and column of the self-capacitance sensing frame as the sensing value of the first sensing point to be compensated; Determine the second sensing point to be compensated, and determine the sensing point that has not been compensated in the touch sensing group; Read the sensing values corresponding to the rows and columns of the self-capacity sensing frame with the rows and columns of the second sensing points to be compensated, and take the average of the sensing values corresponding to the rows and columns of the self-capacitance sensing frame, The average sensing value corresponding to the row and column of the self-capacitance sensing frame is used as the sensing value of the second sensing point to be compensated. 6. The hybrid non-common ground compensation method for a touch panel according to claim 5, wherein the step of determining the second sensing point to be compensated comprises: Preset a critical number; Count the number of sensing values of the upper, lower, left and right sensing points of each sensing point greater than the sensing value of the current sensing point; It is judged whether the number of sensing values greater than the current sensing point exceeds the critical number, and if so, it is regarded as the second sensing point to be compensated. 7 . The hybrid non-common ground compensation method for a touch panel according to claim 6 , wherein the sensing threshold is 10. 8 . 8 . The hybrid non-common ground compensation method for touch panels according to claim 6 or 7 , wherein the critical number is four. 9 .

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