TWI463366B - Hybrid floating compensation method of touch panel - Google Patents

Description

Hybrid uncommon compensation method for touch panel

The present invention relates to a method for non-common compensation of a touch panel, in particular to a hybrid type of a touch panel capable of effectively solving a capacitive touch panel due to a common occurrence of a sensing abnormality, and erroneously determining a touch object. Ground compensation method.

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 by the human body static electricity, and thereby identify the touch position of the user by the capacitance change value; The electrostatic signal is generally connected to the grounding signal of the capacitive touch panel by the metal casing of the capacitive touch panel to form a common electrical structure relationship, so that the user's hand must be in contact with the metal casing.

At present, smart phones with touch-type tablets or large-sized panels are becoming more and more popular, and users may only touch the touch panels of the electronic devices with their fingers or palms, and cannot share them with them; This will cause the capacitance change value to be abnormal in the uncommon 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. As can be seen from the figure, the mutual capacitive type The sensing frame 10 reflects the touch sensing group 200 of the single touch object 30, and the sensing value of the sensing point in the middle should be the maximum value for correctly identifying the coordinates of the touching object, but because of the common ground The measured values of 0, 15 (16-bit) will decrease, and the correct coordinates will not be correctly recognized. It can be seen that the sensing value of the mutual capacitive sensing frame 10 adopting the mutual capacitive scanning in the non-common mode is damaged and affects the coordinate interpretation. Correctness.

It can be seen from the above description that the current capacitive sensing frame is difficult to be touched by the touch panel in the uncommon mode, so the mutual capacitive sensing frame must be destroyed before the coordinate recognition. The sensed value is compensated to avoid false positive coordinates.

In view of the technical disadvantages of the high error rate of the non-co-pattern recognition technology of the capacitive touch panel, the main object of the present invention is to provide an uncommon compensation method for the touch panel to avoid touching objects that are not commonly caused. The coordinates were misjudged.

The main technical means used to achieve the above purpose is that the uncommon compensation method of the touch panel includes: obtaining a mutual capacitive sensing frame and a self-capacitive sensing frame; and touching the mutual sensing frame Touching the rows and columns of the sensing points in the sensing group to read the sensing values of the corresponding rows and columns in the self-capacitive sensing frame, and taking the average of the sensing values of the corresponding rows and columns in the self-capacitive sensing frame to obtain The average sensing value; and 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.

The above-mentioned invention mainly adopts the characteristic that the self-capacitive sensing frame is not susceptible to the common influence, and the sensing value of the row and column of the self-capacitance sensing frame is used as the sensing value of the sensing point in the mutual capacitive sensing frame. Compensation to avoid the error rate of subsequent coordinate judgment.

Referring to FIG. 1 , which is a flow chart of a first preferred embodiment of a method for compensating a touch panel of the present invention, the uncommon compensation method includes: obtaining a mutual capacitive sensing frame and Self-capacitance sensing frame, and preset a threshold value S10; reading the corresponding row and column of the self-capacitive sensing frame in the sensing point row and column of each touch sensing group of the mutual capacitive sensing frame Sensing value, and taking the average of the sensing values of the corresponding row and column in the self-capacitance sensing frame to obtain an average sensing value S11; using the average sensing value as the sensing point of the touch sensing group of the mutual capacitive sensing frame The sensed value is S12.

Please refer to FIG. 8 , which is a self-capacitance sensing frame 20 obtained by self-capacitance scanning in the common mode and the non-common mode respectively. It can be seen from the figure that in the common mode and the non-common mode. Scanning the same pair of Y4', Y4 and X4', X4 to obtain the difference of the sensing signal, only the sensing value of the uncommon mode is slightly lower than that of the common mode, but the peak value of the corresponding touching object 30 The positive value and the maximum value are still maintained, which does not hinder the correctness of the coordinate recognition of the touch object 30; therefore, the present invention uses the self-capacitive frame 20 as the sensing value of the sensing point of the compensation mutual-capacity frame 10, and indeed can The common sense points in the capacitive frame 10 are compensated.

Please refer to FIG. 2 , which is a mutual capacitive sensing frame 10 obtained in the un-common mode, which includes a touch sensing group 200, which is composed of 11 sensing points, wherein the sensing values of the two intermediate sensing points are (0, 15) (16-bit) is subject to The induction value is lower than the other sensing points due to the influence of the uncommon ground, so the sensing point 101 is not common. The process of compensating for a touch sensing group 200 will be described in detail below.

Since the self-capacitance sensing frame 20 includes the sensed values of all the rows and columns of the touch panel, the compensation method of the present invention can read the sensing points of the sensing group 200 and the columns. The sensing values of the corresponding rows and columns in the self-capacitance sensing frame 20 are averaged to obtain the average sensing value of the corresponding row and column in the self-capacitive sensing frame 20 to correspond to the sensing value as the sensing point; Therefore, as shown in FIG. 2, the row, column Y4, X4/Y5, and X4 of the two un-sensing sensing points 101 of the sensing value (0, 15) are read from the corresponding row and column Y4 of the self-contained frame. The induced values (100, 100) of X4/Y5 and X4 (100, 100) are taken from the corresponding values of the corresponding row, column Y4, X4/Y5, and X4 of the volume frame 20 (100, 100) (100, 100) Average value, obtain the average sensing value (100, 100), and then use the average sensing value (100, 100) as the original sensing value (0, 15) to compensate for the two un-sensing sensing points 101, and The compensated touch sensing group 200 is as shown in FIG.

In addition, in order to accelerate the compensation of the ground sensing point 101, the sensing point to be compensated may be further selected in the above step S11, and the self-capacitive sensing frame 20 is read only in the row and column of the sensing point to be compensated. The corresponding value of the corresponding row and column. There are several ways to select the sensing points to be compensated:

1. Presetting a critical count value, and counting the number of sensing points whose sensing values are higher than the sensing points of the sensing points in the touch sensing group, and determining that the critical counting value has been reached, then selecting the sensing point to be compensated.

2. Presetting a critical count value, and counting the number of sensing points of the sensing points of the sensing group in the touch sensing group is lower than the sensing point, and determining that the critical counting has been reached The value is selected as the sensing point to be compensated.

In addition, referring to FIG. 4 and FIG. 5, it is another preferred embodiment of the present invention, which includes: obtaining a mutual capacitive sensing frame 10 and a self-capacitive sensing frame 20, and presetting a sensing threshold. a value S10'; determining a first to-be-compensated sensing point 102, comparing the sensing values of the sensing points of the mutual-capacitive sensing frame 10, and determining a sensing point that is greater than the sensing threshold is the first compensation sensing point 102, S11'; wherein the sensing threshold is higher than a general noise value to avoid including noise in the first compensation sensing point; and reading the self-capacitive sensing image in rows and columns of each first sensing point 102 to be compensated The sensing value of the row and the column corresponding to the frame 20 is as shown in FIG. 2, and the average of the sensing values of the row and the column corresponding to the self-capacitive sensing frame 20 is taken, and the row and column of the self-capacitive sensing frame 20 are corresponding to the row and the column. The average sensing value corresponds to the sensing value S12' as the first to-be-compensated sensing point; the second to-be-compensated sensing point 103 is determined, and the sensing point S13' of the touch sensing group that has not been compensated is determined; and the second to-be-compensated The row and column of the sensing point 103 read the sensing values of the row and column of the self-capacitive sensing frame 20, As shown in FIG. 2, after the average value of the row and column of the self-capacitance sensing frame 20 is averaged, the average sensing value of the corresponding row and column of the self-capacitive sensing frame 20 is used as the second to-be-compensated sensing point. Inductive value S14' of 103.

The above-mentioned second sensing point 103 to be compensated adopts a cross judging program, which means that a critical number is preset, and the sensing values of all the sensing points of the touch sensing group are respectively compared with the sensing points of the upper, lower, left and right points. The sensing values are compared, and the sensing values of the sensing points above, below, left, and right of each sensing point are greater than At present, the number of sensing values of the sensing point determines whether the total number exceeds the critical number; if it exceeds, it indicates that the current sensing point has not been compensated and is regarded as the second to-be-compensated sensing point 103.

The detailed compensation process of the above embodiment is further illustrated by way of example. Referring first to FIG. 2, FIG. 5 and FIG. 6A, the mutual capacitive sensing frame 10 obtained in an uncommon mode includes a touch. In the sensing group 200, the sensing values of the two intermediate sensing points 0, 15 (16-bit) are lower than those of the other sensing points, so the sensing points are not common.

Assuming that the preset sensing threshold is 10, all the sensing values of the touch sensing group 200 are the first to-be-compensated sensing points 102 except for the sensing points with the sensing value of 0, and the first to-be-compensated sensing points 102 are determined. After that, according to each of the first to-be-compensated sensing points 102, the column reads the corresponding row Y4 and column X4 sensing values from the self-contained sensing frame 20, as shown in FIG. 2, and after averaging, averages The sensing value corresponds to the original sensing value of the first to-be-compensated sensing point 102. As shown in FIG. 5, the first to-be-compensated sensing point 102 of the mutual-capacitive sensing frame 10 is compensated, except that the sensing point with a sensing value of 0 is excluded; All the sensing points of the sensing group are inspected, as shown in FIGS. 6A to 6D. In this example, the touch sensing group 200 includes 12 sensing points, so that 12 detections are performed. Assuming that the critical number is 4, it is determined that the sensing values of the four sensing points of the sensing points with the sensing value of 0 are larger than the sensing points, that is, the critical number is satisfied, and the sensing value is 0. The sensing point is the second to-be-compensated sensing point 103, and is compensated, so as to avoid compensation of the sensing point of the non-touching sensing group in the mutual capacitive sensing frame 10, for example, the noise sensing point in FIG. 104. Therefore, the row, column Y4, and X4 of the sensing point with the sensing value of 0 are read from the self-capacitive sensing frame 20 to the corresponding row and column. The sensing values of Y4 and X4 are averaged and then the original sensing value 0 is overwritten as 100. As shown in FIG. 7, all the sensing points of the touch sensing group of the mutual capacitive sensing frame 10 are self-capacitive sensing. The sensing value of the frame 20 is compensated. Since the self-capacitance sensing frame 20 is less affected by the common ground, the compensated mutual capacitive sensing frame 10 can correctly identify the touch object coordinates.

In summary, the present invention can compensate the touch sensing group read in the uncommon mode, and the induced value of the touched sensing group is returned to the sensing value in the grounding mode for subsequent operation. The coordinate judgment step of the touch position; this also means that the vertical user does not have to touch the electronic device (common mode) using the capacitive touch panel, and can correctly determine the touch position of the user's finger, thereby avoiding restriction of the user. Usage habits.

10‧‧‧ Mutual Sensing Frame

100‧‧‧Feeling points

101‧‧‧not common ground sensing points

102‧‧‧First compensation point to be compensated

103‧‧‧First compensation point to be compensated

104‧‧‧ Noise induction points

20‧‧‧Self-sensitive sensor frame

30‧‧‧Touch objects

200‧‧‧Touch sensing group

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing a first preferred embodiment of the method of co-compensation of the present invention.

Figure 2: A capacitive sensing frame and a self-contained sensing frame obtained by mutual-capacitance and self-capacitance scanning of a touch panel in a non-common mode, wherein the self-capacitive sensing frame only contains a part Line and column sensing signals.

Figure 3: The mutual capacitive sensing frame after the common compensation is performed by the mutual capacitive sensing frame of Fig. 2.

Figure 4 is a flow chart showing a second preferred embodiment of the method of co-compensation of the present invention.

FIG. 5 is a mutual capacitive sensing frame after the first compensation point to be compensated in the mutual capacitive sensing frame of FIG. 2 is not compensated.

6A to 6D are flowcharts showing a cross determination procedure.

FIG. 7 is a mutual capacitive sensing frame after the second compensation point to be compensated for the second capacitive sensing point of the mutual capacitive sensing frame of FIG. 2 .

FIG. 8 is a self-capacitive scan frame and a self-capacitance scan frame read by a touch panel in a common mode scan, and a self-capacitance scan frame read in a common mode scan, wherein The capacitive sensing frame contains only some of the row and column sensing signals.

Claims (8)

A non-common compensation method for a touch panel includes: obtaining a mutual capacitive sensing frame and a self-capacitive sensing frame; and touching a row of at least one sensing point in the sensing group by the mutual sensing sensing frame And reading the sensing values of the corresponding rows and columns in the self-contained sensing frame, and taking the average of the sensing values of the corresponding rows and columns in the self-capacitive sensing frame to obtain an average sensing value; and The sensing value is used as the sensing value of the corresponding sensing point in the touch sensing group of the mutual capacitive sensing frame. The non-common compensation method of the touch panel of claim 1, wherein the self-capacitive sensing frame is read by the row and column of at least one sensing point in the touch sensing group of the mutual capacitive sensing frame In the step of corresponding to the sensing values of the rows and columns, the sensing values of the corresponding rows and columns in the self-capacitive sensing frame are further read by the rows and columns of all the sensing points in each touch sensing group. The non-common compensation method of the touch panel of claim 1, wherein the self-capacitive sensing frame is read by the row and column of at least one sensing point of each touch sensing group of the mutual capacitive sensing frame. Corresponding to the sensing value of the row and the column, the method further includes: presetting a threshold value; and selecting the sensing point to be compensated, determining that the sensing value of each sensing point of each touch sensing group is higher than the sensing value If the number of points has reached the threshold value, it is selected as the sensing point to be compensated; and the row and column of the sensing point to be compensated are used to read the sensing values of the corresponding row and column of the self-capacitance sensing frame. The uncommon compensation method of the touch panel according to claim 1, wherein In the step of reading the sensing value of the corresponding row and column in the self-capacitive sensing frame by the row and column of the at least one sensing point in the touch sensing group of the mutual sensing frame, the system further includes: a preset There is a counting threshold; selecting the sensing point to be compensated, determining that the number of sensing points of each sensing point of each touch sensing group is lower than the number of sensing points that have reached the counting threshold, then selecting the sensing point to be compensated; And sensing the sensed values of the row and column of the self-capacitance sensing frame in the row and column of the sensing point to be compensated. A non-common compensation method for a touch panel includes: obtaining a mutual capacitive sensing frame and a self-capacitive sensing frame, and presetting a sensing threshold; determining a first sensing point to be compensated, comparing each other The sensing value of each sensing point of the capacitive sensing frame is the first compensation sensing point when determining that the sensing value is greater than the sensing threshold; the self-capacitive sensing is read by the row and column of each first sensing point to be compensated The frame corresponds to the sensed value of the row and the column, and the average value of the corresponding row and column of the self-capacitance sensor frame is taken as the first waiting after the average value of the corresponding row and column of the self-capacitance sensor frame is averaged. Compensating the sensing value of the sensing point; determining the second sensing point to be compensated, determining the sensing point in the sensing group that has not been compensated; and reading the self-capacitive sensing pattern in the row and column of each of the second sensing points to be compensated The frame corresponds to the sensed value of the row and the column, and the average value of the corresponding row and column of the self-capacitance sensing frame is averaged as the second to be compensated. The sensed value of the sensing point. The method for determining the second to-be-compensated sensing point includes: presetting a critical number; and counting the sensing points in the touch sensing group, as described in claim 5, The number of sensing points of the surrounding sensing points of the lower, left, and right sides is greater than the number of sensing values of the sensing points; and determining whether the number of sensing points of the sensing group in the touch sensing group exceeds the critical number, and if it exceeds The sensing point is a second sensing point to be compensated. For the uncommon compensation method of the touch panel described in claim 6, the sensing threshold is 10. For the uncommon compensation method of the touch panel in claim 6 or 7, the critical number is 4.