CN102200851A - Touch panel and touch detection method - Google Patents

Abstract

The invention discloses a touch detection method, which comprises the step of providing a touch panel with a plurality of axial sensors which are arranged side by side in sequence, wherein each axial sensor outputs a sensing signal. The touch detection method is used for calculating judgment data according to the induction signals, wherein the judgment data sequentially corresponds to one of the axial inductors or one of a plurality of inductor pairs consisting of the axial inductors. When the two adjacent judgment data are respectively larger than and smaller than a reference value, the touch detection method determines a touch point according to the position of the axial sensor or the sensor pair corresponding to the judgment data.

Description

Touch panel and touch detection method

technical field

The invention relates to a touch panel and a touch detection method used therein; in particular, a capacitive touch panel and a touch detection method used therein.

Background technique

Touch display panels are currently very common electronic devices on the market, and are also widely used in mobile phones, monitors and notebook computers, so that electronic products can receive user feedback through touch while displaying images. instruction. In addition, the multi-touch panel with multi-touch detection function is gradually replacing the single-point touch panel, and through the multi-touch detection function, it provides to the application function.

FIG. 1A is a schematic diagram of a known touch panel 10 , wherein the known touch panel 10 of this embodiment is a capacitive touch panel. The known touch panel 10 includes a plurality of X-axis sensing chains X1, X2, X3, X4, X5, X6, X7, X8 and a plurality of Y-axis sensing chains Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8. FIG. 1A also shows X-axis sensing signals x1 , x2 , x3 , x4 , x5 , x6 , x7 , x8 and Y-axis sensing signals y1 , y2 , y3 , y4 , y5 , y6 , y7 , y8 . As shown in FIG. 1A , the user forms a first touch point 600 on the known touch panel 10 by touching. Since the user's touch changes the overall effective capacitance of the X-axis induction link X7 and the Y-axis induction link Y3, the signals x7 and y3 output by the X-axis induction link X7 and the Y-axis induction link Y3 are higher than those output by other induction links signal of. It is known that the signal processing module 430 of the touch panel 10 will determine the coordinates of the center point of the first touch point 600 on the X-axis according to the position of the X-axis induction chain corresponding to the maximum signal after receiving the signal from the X-axis processing bar. . Similarly, the coordinate calculation module will determine the coordinates of the center point of the first touch point on the Y-axis according to the position of the Y-axis induction chain corresponding to the maximum signal output by the Y-axis processing bar. Therefore, it is known that the signal processing module of the touch panel 10 will determine the coordinates of the first touch point 600 as (X7, Y3) according to the above determination conditions.

In addition, the known touch panel 10 shown in FIG. 1B further includes a second touch point 610, wherein the second touch point 610 will make the sensing signal y5 output by the Y-axis sensing link Y5 be greater than that of the Y-axis sensing link Y4. The external induction signal y4. The signal processing module of the touch panel will detect the sensing signals y3 and y5 with the largest amplitudes and the sensing signal y4 with the smaller amplitude between the two sensing signals, and determine the first touch point 600 and the second touch point 600 according to the magnitude relationship between the sensing signals. The existence and coordinates of the second touch point 610 .

It can be known from the above description that the above-mentioned known touch detection method is to determine the maximum value and the minimum value by detecting the sensing signal and comparing the sensing signal, and based on this, the existence of the touch point is determined and the coordinates of the touch point are defined. However, the above-mentioned known touch detection methods need to repeatedly perform signal detection and comparison, thus requiring relatively large computing resources and improving efficiency. In addition, the known touch detection method does not take the noise of the operating environment into consideration in the coordinate calculation, so the noise of the operating environment may affect the signal-to-noise-ratio (SNR) of the known touch panel. ratio) may even affect the accuracy of touch point detection.

Contents of the invention

One object of the present invention is to provide a touch panel and a touch detection method for providing multi-touch functions.

Another object of the present invention is to provide a touch panel and a touch detection method for improving the accuracy of touch points.

The present invention includes a touch panel and a touch detection method, wherein the touch detection method includes providing a touch panel with a plurality of axial sensing chains arranged side by side in sequence, wherein each axial sensing chain outputs a sensing signal . The touch detection method is to obtain judgment data according to the sensing signal, wherein the judgment data is sequentially corresponding to one of the axial sensors or one of the plurality of sensor pairs composed of two axial sensing chains. When two adjacent judging data are respectively greater than and smaller than a reference value, the touch detection method will determine a touch point according to the position of one of the judging data corresponding to the axial sensing link or sensor pair. In other words, when a touch point is generated on the touch panel, if the sensing signals output by two adjacent axial sensing chains are respectively higher than and lower than the above-mentioned reference value, the signal processing module of the touch panel will perform according to at least the above-mentioned The two sensing signals determine the position or coordinates of the touch point.

In different embodiments, the touch panel of the present invention includes a plurality of sensor pairs, wherein each sensor pair includes two adjacent axial sensing chains. The signal processing module of the touch panel will obtain the difference of the sensing signals output by each sensor to the included axial sensing chain and generate a differential value. When the touch point is generated, when two adjacent differential values are respectively greater than and less than the reference value, the signal processing module will obtain the coordinates of the touch point according to the position of the axial sensor corresponding to one of the differential values.

In addition, a threshold value can be set, wherein the threshold value represents the average amplitude of noise in the operating environment. Even if the sequentially adjacent sensing signals are greater than and smaller than the reference value at the same time, the difference between the amplitude of at least one of the sensing signals and the reference value needs to be larger than the threshold value. Therefore, the touch detection method of the present invention avoids false detection of non-existing touch points due to noise in the operating environment through the setting of the threshold.

Description of drawings

1A and 1B are schematic diagrams of known touch panels;

2A, 2B and 2C are schematic diagrams of the touch panel of the present invention;

Fig. 3 shows another embodiment of the touch panel shown in Fig. 2A, Fig. 2B and Fig. 2C;

FIG. 4A, FIG. 4B, FIG. 4C and FIG. 5 are variations of the touch panel shown in FIG. 2A;

FIG. 6 is a step diagram of the touch detection method of the present invention; and

FIG. 7 and FIG. 8 are variations of the touch detection method shown in FIG. 6 .

Description of main component symbols

100 touch panel

X1, X2, X3, X4, X5, X6, X7, X8: X-axis induction chain

210X axis sensor

220X axis connector

230X axis electrode

Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8: Y-axis induction chain

310Y axis sensor

320Y axis connector

330Y axis electrode

400 signal processing module

410 multiplexer

420 Analog to Digital Converter

430 coordinate calculation module

600 first touch points

610 second touch point

700 first reference value

710 second reference value

800 Threshold

x1, x2, x3, x4, x5, x6, x7, x8X axis sensing signal

Δx1, Δx2, Δx3, Δx4, Δx5, Δx6, Δx7, Δx8 X-axis differential value

y1, y2, y3, y4, y5, y6, y7, y8 Y-axis sensing signal

Δy1, Δy2, Δy3, Δy4, Δy5, Δy6, Δy7, Δy8 Y-axis differential value

Detailed ways

The invention discloses a touch panel and a touch detection method, especially a touch panel with multi-touch function. One of the objectives of the present invention is to provide a touch panel and a touch detection method to generate a plurality of corresponding determination data according to the sensing signals output by the plurality of axial sensing chains, wherein the determination data can be sequentially corresponding to the axes One of the induction chains or one of the sensor pairs formed by adjacent axial induction chains in sequence. At the same time, the touch detection method of the present invention will define a reference value and simultaneously detect whether the determination signal is greater than or less than the reference value at the same time, and judge whether there is a touch generated by the user on the touch panel according to the detection result. touch point.

FIG. 2A is a schematic diagram of a touch panel 100 , wherein the touch panel 100 of this embodiment is a capacitive touch panel. As shown in FIG. 2A, the touch panel 100 includes a plurality of X-axis sensing chains X1, X2, X3, X4, X5, X6, X7, X8, and a plurality of Y-axis sensing chains Y1, Y2, Y3, Y4, Y5, Y6, Y7. , Y8 and a signal processing module 400, wherein the signal processing module 400 includes a multiplexer (Multiplexer) 410, an analog-to-digital converter (Analogue-to-digital converter) 420 and a coordinate calculation module 430. The X-axis induction chains X1, X2, X3, X4, X5, X6, X7, and X8 of this embodiment are arranged side by side in order, wherein each X-axis induction chain includes a plurality of X-axis sensors 210 and a plurality of X-axis connectors 220, And each X-axis connector 220 is electrically connected to the adjacent X-axis sensor 210 at the same time so that the two X-axis sensors 210 are electrically connected to each other. Similarly, the Y-axis induction chains Y1, Y2, Y3, Y4, Y5, Y6, Y7, and Y8 are arranged side by side in order, wherein each Y-axis induction chain also includes a plurality of Y-axis sensors 310 and a plurality of Y-axis connectors 320, Each Y-axis connector 320 is simultaneously connected to adjacent Y-axis sensors 310 so that the two Y-axis sensors 310 are electrically connected to each other. In addition, in FIG. 2A , the X-axis connector 220 and the Y-axis connector 320 overlapped with each other are all insulated, so even if they are in contact with each other, they will not conduct with each other.

As shown in Figure 2A, the X-axis induction chain X1, X2, X3, X4, X5, X6, X7, X8 and the Y-axis induction chain Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8 respectively include multiple X-axis The electrodes 230 and a plurality of Y-axis electrodes 330 , wherein the X-axis electrodes 230 are electrically connected to the end of the X-axis induction chain to output induction signals. Likewise, the Y-axis electrode 330 is electrically connected to the Y-axis sensor 310 at the end of the Y-axis sensing chain to output a sensing signal. The X-axis electrode 230 and the Y-axis electrode 330 are electrically connected to the multiplexer 410 so that the signals output by the X-axis induction chain and the Y-axis induction chain are transmitted to the analog-to-digital converter 420 through the multiplexer 410, and then the analog-to-digital converter 420 then transmits the sensing signal in digital form to the coordinate calculation module 430 for further analysis and processing of the touch point. In this embodiment, the signals output by the X-axis induction chain and the Y-axis induction chain are voltages, but not limited thereto; The form of data that can be used to refine capacitance and can be calculated.

FIG. 2B is another schematic diagram of the touch panel shown in FIG. 2A, wherein the X-axis sensing chains X1, X2, X3, X4, X5, X6, X7, X8 and the Y-axis sensing chains Y1, Y2, Y3, Y4, Y5, Y6, Y7, and Y8 respectively output complex X-axis sensing signals x1, x2, x3, x4, x5, x6, x7, x8 and complex Y-axis sensing signals through the X-axis electrodes 230 and Y-axis electrodes 330 in the first period. The signals y1, y2, y3, y4, y5, y6, y7, y8 are sent to the signal processing module 400. In a preferred embodiment, all the X-axis sensing signals can be output at the same time point in the first time period; however, in different embodiments, the X-axis sensing signals can also be output at different time points in the first time period. In this embodiment, the user forms a first touch point 600 on the touch panel by touching, wherein the first touch point 600 changes the overall effective capacitance of the X-axis sensing link X7 and the Y-axis sensing link Y3 , so the signal output by the above inductive chain is higher than the signal output by other inductive chains. In addition, the area of the first touch point 600 covering the induction chain is positively correlated with the signal amplitude output by the induction chain, but it is not limited thereto; in different embodiments, the area of the first touch point 600 can be related to The output signal amplitude of the induction chain is negatively correlated.

In the embodiment shown in FIG. 2B , the touch panel 100 is set with a first reference value 700 and a second reference value 710 . As shown in FIG. 2B , the first touch point 600 covers the largest area of the X-axis sensing chain X7 , so the amplitude of the X-axis sensing signal x7 is larger than the X-axis sensing signals output by other X-axis sensing chains. In addition, the X-axis sensing signals x6 and x7 are respectively smaller than and larger than the first reference value 700 at the same time, and the X-axis sensing signals x7 and x8 are respectively larger than and smaller than the first reference value 700 at the same time. The coordinate calculation module 430 will detect the above relationship after receiving the X-axis sensing signals x6 , x7 and x8 from the analog-to-digital converter 420 . According to the comparison relationship between the above-mentioned X-axis sensing signals x6 and x7 and the first reference value 700, or according to the comparison relationship between the X-axis sensing signals x7 and x8 and the first reference value 700, the coordinate calculation module 430 will determine that the amplitude of the X-axis is higher The position of the X-axis sensor X7 corresponding to the sensing signal x7 is the X-axis coordinate of the first touch point 600 . Similarly, the coordinate calculation module 430 detects the Y-axis sensor chain Y3 corresponding to the Y-axis sensor signal y3 according to the second reference value 710 as the Y-axis coordinate of the first touch point 600 . It can be seen from this that each X-axis sensing signal and each Y-axis sensing signal in this embodiment is determination data for detecting the coordinate of the first touch point 600 .

In addition, as shown in FIG. 2B , in order to take the noise in the use environment into the consideration of touch detection and judgment, the touch panel 100 of this embodiment can further set a threshold 800, which represents that the touch panel may The value of the disturbance received. In this embodiment, one of the conditions for determining coordinates is that when two sequentially adjacent X-axis sensing signals are respectively greater than and smaller than the first reference value 700, at least one of the two X-axis sensing signals is consistent with the first reference value The difference of 700 is greater than the threshold of 800. In this way, even if the noise in the use environment is higher than the first reference value 700, the touch panel 100 can reduce the chance of detecting a wrong touch point due to noise. For example, as shown in FIG. 2B , even if the X-axis sensing signal x7 is greater than the first reference value 700, the coordinate calculation module 430 must still confirm that the difference between the X-axis sensing signal x7 and the first reference value 700 is greater than the threshold value 800 , it can be determined that the position of the X-axis induction chain X7 is the X-axis coordinate of the first touch point 600 . In the embodiment shown in FIG. 2B , the difference between at least one of the two X-axis sensing signals and the first reference value 700 is greater than the threshold value 800, but it is not limited thereto; in different embodiments, the touch panel 100 is also It may be required that the difference between the two X-axis sensing signals and the first reference value 700 must be greater than the threshold 800 at the same time.

FIG. 2C shows a modified embodiment of the touch panel 100 shown in FIG. 2A and FIG. 2B . In this embodiment, the area of the first touch point 600 is larger than that shown in FIG. 2A and FIG. 2B and simultaneously covers the X-axis sensing links X6 and X7. The X-axis sensing signals x6 and x7 output by the X-axis sensing chains X6 and X7 are higher than the first reference value 700 at the same time. As shown in FIG. 2C, the X-axis sensing signal x7 is higher than the X-axis sensing signal x6, so the coordinate calculation module 430 initially determines that the position of the X-axis sensing chain X7 is the center point of the first touch point 600, but not only In this way, the coordinate calculation module 430 will calculate the numerical difference between the X-axis sensing signals x6 and x7 and adjust the X-axis coordinate of the center point of the first touch point 600 according to the calculation result. In other words, the X-axis coordinate of the center point of the first touch point 600 finally calculated by the calculation module 430 will be between the center positions of the X-axis induction links X6 and X7 . Similarly, the Y-axis coordinate of the center point of the first touch point 600 finally calculated by the calculation module 430 will be between the center positions of the Y-axis sensor links Y2 and Y3 .

In addition, after calculating the center point of the first touch point 600 on the X-axis for the first time, the coordinate calculation module 430 extracts one or several X-axis sensing signals adjacent to the X-axis sensing signal x7 and uses the inner difference method , dispersion method or other calculation methods to further calculate the precise position and coordinates of the center point of the first touch point 600 on the X-axis. Likewise, the Y-axis sensing signal adjacent to the Y-axis sensing signal y3 will be used to further calculate the precise position of the center point of the first touch point 600 on the Y-axis. In this embodiment, the coordinate calculation module 430 uses the X-axis sensing signals x6 and x8 adjacent to the X-axis sensing signal x7 to confirm the position of the first touch point 600 on the X-axis, but is not limited thereto; the coordinates The calculation module 430 may also add the difference between other X-axis sensing signals and x7 to further confirm the position of the first touch point 600 on the X-axis. Likewise, the Y-axis sensing signals other than the Y-axis sensing signals y2, y3, and y4 can be used to calculate the position of the first touch point 600 on the Y-axis. From the above description, it can be seen that even if the first touch point 600 has an unfixed area, the calculation module 430 can obtain the center of the first touch point 600 according to the amplitude of the continuous sensing signal and repeated calculation and correction of the position of the center point. point.

FIG. 3 shows another embodiment of the touch panel shown in FIG. 2A . As shown in FIG. 3 , the user of the touch panel 100 forms a first touch point 600 and a second touch point 610 on the touch panel 100 by touching. In this embodiment, the touch panel 100 includes a first reference value 700 and a second reference value 710 corresponding to the X-axis sensing signal of the X-axis sensing chain and the Y-axis sensing signal of the Y-axis sensing chain, respectively. The first touch point 600 and the second touch point 610 are substantially arranged along the X-axis sensing chain X7 , so the X-axis sensing signal x7 corresponding to the X-axis sensing chain X7 is higher than the first reference value 700 . In addition, since the X-axis sensing signals x7 and x8 corresponding to the X-axis sensing chains X7 and X8 are respectively higher and lower than the first reference value 700, the coordinate calculation module 430 therefore determines that X7 is the X-axis position of the touch point. At this time, since the coordinate calculation module 430 has not yet calculated all the Y-axis information, it is impossible to determine whether there is a single or multiple touch points on the touch panel 100 .

In addition, the first touch point 600 and the second touch point 610 are located above the Y-axis sensing links Y3 and Y5 respectively, so the Y-axis sensing signals y3 and y5 corresponding to the Y-axis sensing links Y3 and Y5 are higher than the second The base value is 710. Since the Y-axis sensing link Y4 is not covered by the first touch point 600 and the second touch point 610 , the Y-axis sensing signal y4 corresponding to the Y-axis sensing link Y4 is lower than the second reference value 710 . After calculating all the X-axis sensing signals and Y-axis sensing signals, the coordinate calculation module 430 will know that the Y-axis sensing signals y3 and y4 corresponding to the Y-axis sensing chains Y3 and Y4 are respectively greater than and less than the second reference value 710 , Therefore, the position of the Y-axis inductive link Y3 is determined as the Y-axis position of the first touch point 600 at the same time. Similarly, the position of the Y-axis inductive link Y5 is also determined as the Y-axis position of the second touch point 610 . At this time, after obtaining the Y-axis position, the coordinate calculation module 430 will determine that the center positions of the first touch point 600 and the second touch point 610 are respectively (X7, Y3) and (X7, Y5) and thus Achieve multi-touch function. In addition, after extracting the X-axis sensing signal adjacent to the X-axis sensing signal x7 and the Y-axis sensing signals adjacent to the Y-axis sensing signals y3 and y5, the inner difference method, dispersion method or other methods can be used to further calculate the first The precise positions of the first touch point 600 and the second touch point 610 on the X-axis and the Y-axis. In this embodiment, the touch panel 100 is used to detect the central coordinates of the first touch point 600 and the second touch point 610, but it is not limited thereto; in different embodiments, the touch panel 100 can also be used for Detect other number of touch point center coordinates.

FIG. 4A shows a modified embodiment of the touch panel shown in FIG. 2A . The touch panel includes complex X-axis differential values Δx2, Δx3, Δx4, Δx5, Δx6, Δx7, Δx8 and complex Y-axis differential values Δy2, Δy3, Δy4, Δy5, Δy6, Δy7, Δy8. In a preferred embodiment, all the X-axis differential values and Y-axis differential values can be output at the same time point in the first time period at the same time. Please refer to FIG. 2B and FIG. 4A at the same time. In this embodiment, every two adjacent X-axis inductive chains will be assigned to a sensor pair, wherein the X-axis generated by the X-axis inductive chain in each sensor pair The induction signal will be used to calculate the X-axis differential value; and the above-mentioned X-axis differential value is the difference between the X-axis induction signals output by two adjacent X-axis induction chains at the same time point; in other words, the X-axis differential value Represents the signal gap between two adjacent X-axis sensing chains at the same time point of the X-axis sensing signal. For example, the X-axis differential value Δx2 corresponding to the X-axis sensing link X2 is the difference between the X-axis sensing signals x2 and x1 between the X-axis sensing links X2 and X1. Similarly, the Y-axis sensing link forms a plurality of sensing pairs, wherein, for example, the Y-axis differential value Δy2 corresponding to the Y-axis sensing link Y2 is the difference between the Y-axis sensing signals y2 and y1 between the Y-axis sensing link Y2 and Y1.

In addition, the calculation of the differential signal in this embodiment can be used to eliminate environmental noise. Please refer to FIG. 2B, FIG. 4A and the following formula (1), where N is environmental noise:

(x2+N)-(x1+N)＝x2-x1＝Δx2 (1)

It can be seen from the formula (1) that through differential signal calculation, the touch panel 100 can effectively eliminate common-mode noise components (Common-mode Noise) that may be included in the two sensing signals, so as to improve the signal of the touch panel Processed signal-to-clutter ratio.

In addition, in the embodiment shown in FIG. 4A, the touch panel 100 sets a first reference value 700, which is defined as when the X-axis sensing chain included in the sensing pair is not covered by the first touch point 600, The difference of the X-axis induction value between the above-mentioned adjacent X-axis induction chains. In this embodiment, when the X-axis sensing chain in the sensing pair is not covered by the first touch point 600, the X-axis sensing values output by the two X-axis sensing chains are substantially equal, and therefore the sensing pair The corresponding X-axis differential value and the first reference value 700 are substantially zero, but not limited thereto; in different embodiments, the first reference value 700 may also include other suitable values.

Please refer to FIG. 2A and FIG. 4A at the same time. Since the X-axis sensing link X8 is not covered by the first touch point 600, the corresponding X-axis sensing value x8 is smaller than the X-axis sensing value of the X-axis sensing link X7. x7, therefore, the X-axis differential value Δx8 corresponding to the X-axis induction link X8 is a negative value. When the coordinate calculation module 430 receives the X-axis differential value transmitted from the analog-to-digital converter 420, it will find that the X-axis differential values Δx7 and Δx8 corresponding to the X-axis induction links X7 and X8 are respectively greater than and less than the first The base value is 700. The X-axis differential values Δx7 and Δx8 are respectively the X-axis induction values x6, x7 and x8 generated by the X-axis induction pair X6 and X7 and the X-axis induction pair X7 and X8, wherein the X-axis induction pair X7 is repeated in The above two pairs of X-axis induction chains are therefore selected as the position of the first touch point 600 on the X-axis. According to the above relationship of the X-axis induction chain, the coordinate calculation module 430 determines the position of the X-axis induction chain X7 corresponding to the larger one Δx7 of the two X-axis differential values as the X-axis of the center point of the first touch point 600 Location. Similarly, the coordinate calculation module 430 of the embodiment shown in FIG. 4A will also be based on the Y-axis differential value Δy3 corresponding to the Y-axis induction chain Y3 and Y4, and the position of the Y-axis induction chain Y3 corresponding to the higher value Δy3 of Δy4. The Y-axis coordinate of the first touch point 600 is selected, so the position of the Y-axis induction chain Y3 is defined as the Y-axis coordinate of the center point of the first touch point 600 . Finally, the coordinate calculation module 430 will determine the coordinates of the first touch point as (X7, Y3) according to the above-mentioned X-axis differential value and Y-axis differential value, thereby realizing the single-touch function. It can be known from the above description that in this embodiment, the X-axis differential value and the Y-axis differential value obtained according to two adjacent X-axis sensing signals are used as the X-axis coordinates for detecting the first touch point 600 and Y-axis coordinates, rather than a single sensing signal. In other words, the determination data used to detect the first touch point 600 and its acquisition method will vary due to different implementations.

In addition, in the embodiment shown in FIG. 4A , the selection of the induction chain in the sensor pair and the calculation of the differential value are performed according to the formula (X _n −X _n−1 ). For example, the X-axis differential value Δx2 is obtained by subtracting the X-axis sensing signal x2 output by the X-axis sensing link X2 from the X-axis sensing signal x1 output by the X-axis sensing link X1 , but it is not limited thereto. In addition, in the embodiment shown in FIG. 4A , the touch panel 100 sets a threshold value 800, wherein the threshold value 800 is used to prevent the touch panel 100 from affecting the detection of the touch point due to noise in the operating environment. . In this embodiment, even if the X-axis differential values Δx7 and Δx8 are respectively greater than and smaller than the first reference value 700, the difference between at least one of the two differential values and the first reference value 700 must be greater than the threshold. Only when the above two conditions are satisfied, the coordinate calculation module 430 will determine the position of the X-axis sensor chain X7 as the X-axis coordinate of the first touch point 600 . By setting the condition that the difference must be greater than the threshold 800, the touch panel 100 can avoid misjudgment of the touch point caused by environmental noise or quantization error. In this way, the noise of the usage environment is higher than the first reference value 700, and the coordinate calculation module 430 can also reduce the chance of detecting wrong touch points due to noise.

FIG. 4B shows a variant embodiment shown in FIG. 4A , wherein the differential values of the embodiments shown in FIG. 4A and FIG. 4B are calculated by different formulas. In this embodiment, the calculation of the differential value is carried out according to the formula (Xn _-1 - _Xn ); in other words, the calculation method and sampling direction of the differential value shown in Figure 4B are opposite to those shown in Figure 4A Therefore, the manner of determining the coordinates of the touch point is also opposite to that of the embodiment shown in FIG. 4A . As shown in FIG. 4B , the touch panel includes complex X-axis differential values Δx1, Δx2, Δx3, Δx4, Δx5, Δx6, Δx7 and complex Y-axis differential values Δy1, Δy2, Δy3, Δy4, Δy5, Δy6, Δy7. For example, when the X-axis differential signals Δx6 and Δx7 are respectively less than and greater than the first reference value 700, the coordinate calculation module 430 will measure the relationship between the X-axis differential signals Δx6 and Δx7 and the first reference value It is determined that the position of the X-axis induction chain X7 is the X-axis coordinate of the first touch point 600 . Except for the calculation method of the differential value, the touch panel 100 shown in FIG. 4B is substantially the same as the touch panel 100 shown in FIG. 4A , so details will not be repeated here.

In addition, in the embodiment shown in FIG. 4A and FIG. 4B , the way to obtain the X-axis differential signal is to input the X-axis induction signals generated by all X-axis induction chains into the analog-to-digital converter 420 for the analog-to-digital converter 420 senses the signal according to the X axis and automatically outputs the X axis differential signal. For example, the X-axis sensing signals x1 and x2 are input to the analog-to-digital converter 420 at the same time point in the first period for the analog-to-digital converter 420 to generate the X-axis differential value Δx2. Likewise, the Y-axis sensing signals y4 and y5 are input to the analog-to-digital converter 420 at the same time point in the first period to generate the Y-axis differential value Δy5. In this embodiment, the analog-to-digital converter 420 can selectively output all the X-axis differential signals at the first time point of the first period or output the X-axis differential signals at different time points of the first period.

FIG. 4C shows another embodiment of the touch panel shown in FIG. 4A and FIG. 4B . In this embodiment, the X-axis differential value and the Y-axis differential value are calculated according to the formula (X _n -X _n-1 ). As shown in Figure 4C, the area of the first touch point 600 is larger than that of Figure 4A and Figure 4B and covers the X-axis induction links X6 and X7 at the same time, so the X-axis differential values Δx6 and Δx7 are also higher than the first reference Value 700. As shown in FIG. 2C , the X-axis differential value Δx7 is higher than the X-axis differential value Δx6, so the coordinate calculation module 430 initially determines that the position of the X-axis induction chain X7 is the position of the center point of the first touch point 600 , but then the coordinate calculation module 430 will extract the X-axis differential value adjacent to the X-axis differential value Δx7 and use the interpolation method, dispersion method or other calculation methods to further calculate the center point of the first touch point 600 at Exact position on the X axis. Likewise, the Y-axis differential value adjacent to the Y-axis differential value Δy3 will be used to further calculate the precise position of the first touch point 600 on the Y-axis. From the above description, it can be seen that even if the first touch point 600 has an unfixed area, the calculation module 430 can calculate the precise position of the center point of the first touch point 600 according to continuous and adjacent differential values.

FIG. 5 shows another embodiment of the touch panel shown in FIG. 4A , wherein the user forms a first touch point 600 and a second touch point 610 on the touch panel 100 by touching. As shown in FIG. 5, the touch panel 100 includes a first reference value 700 and a second reference value 710, corresponding to the X-axis differential values Δx2, Δx3, Δx4, Δx5, Δx6, Δx7, Δx8 and the Y-axis differential values Δy2, Δy3, Δy4, Δy5, Δy6, Δy7, Δy8. The first touch point 600 and the second touch point 610 are substantially arranged along the X-axis sensing link X7 , so the X-axis differential value Δx7 corresponding to the X-axis sensing link X7 is higher than the first reference value 700 . In addition, since the X-axis differential values corresponding to the X-axis induction chains X7 and X8 are Δx7, Δx8 are respectively higher and lower than the first reference value 700, the coordinate calculation module 430 thus determines that X7 is the X-axis position of the touch point . At this time, since the coordinate calculation module 430 has not yet calculated all the Y-axis differential values, it is impossible to determine whether there are multiple touch points on the touch panel 100 .

In addition, the first touch point 600 and the second touch point 610 are respectively located on the Y-axis induction links Y3 and Y5, so the Y-axis differential values Δy3 and Δy5 corresponding to the Y-axis induction links Y3 and Y5 are higher than the first The second benchmark value is 710. Since the Y-axis induction links Y4 and Y6 are not covered by the first touch point 600 and the second touch point 610, the Y-axis differential values Δy4 and Δy6 corresponding to the Y-axis induction links Y4 and Y6 are lower than the second reference Value 710. Using the X-axis differential value and the Y-axis differential value, the coordinate calculation module 430 will know that the Y-axis differential values Δy3 and Δy4 corresponding to the Y-axis induction links Y3 and Y4 are respectively greater than and less than the second reference value 710, and Therefore, at the same time, the position of the Y-axis induction chain Y3 is determined as the Y-axis position of the first touch point 600. Similarly, the position of the Y-axis inductive link Y5 is also determined as the Y-axis position of the second touch point 610 . At this time, after obtaining the Y-axis coordinates, the coordinate calculation module 430 will determine the positions of the first touch point 600 and the second touch point 610 as (X7, Y3) and (X7, Y5) respectively, and thus obtain Know multi-touch. In addition, the inner difference method, dispersion method or other methods can be used after extracting the X-axis differential value adjacent to the X-axis differential value Δx7 and the Y-axis differential values adjacent to the Y-axis differential values Δy3 and Δy5 In order to further calculate the precise positions of the first touch point 600 and the second touch point 610 on the X-axis and the Y-axis. In this embodiment, the touch panel 100 is used to detect the center coordinates of the first touch point 600 and the second touch point 610, but it is not limited thereto; in different embodiments, the touch panel 100 can also be used for Detect other number of touch point center coordinates.

FIG. 6 is a step diagram of the touch detection method of the present invention. As shown in FIG. 6 , the touch detection method includes step S900 , providing a touch panel including a plurality of axial sensors arranged in sequence, wherein each of the axial sensors outputs a sensing signal. In this embodiment, the touch panel is a capacitive touch panel including a plurality of axial sensing chains, wherein each axial sensing chain includes a plurality of independent but interconnected axial sensors. The user's touch will change the overall capacitance of the axial sensor and the corresponding axial sensing chain, and at the same time change the sensing signal output by the axial sensing chain, but it is not limited thereto; in different embodiments, the touch sensor of the present invention The panel also includes a resistive touch panel, an acoustic wave touch panel or other types of touch panels.

The touch detection method further includes S910, which generates complex determination data according to the sensing signal output by the axial sensor. In this embodiment, the sensing signal output by the above-mentioned axial sensing chain is converted from analog form to digital form for processing by the coordinate calculation module, wherein the sensing signal is sequentially corresponding to one of the plurality of axial sensing chains. As shown in FIG. 6 , step S920 includes determining a touch point according to the position of the axial sensor corresponding to the determination data when two adjacent determination data are respectively greater than and less than a reference value. When two adjacent sensing signals in sequence are respectively greater than and less than a reference value, it means that at least one of the axial sensing chains corresponding to the sensing signal has sensed a touch. In this embodiment, the position of the axial sensing link corresponding to the higher amplitude of the two sensing signals will be determined as the position of the touch point, wherein other sensing signals adjacent to the sensing signal can be selectively captured And at the same time use interpolation method, dispersion method or other methods to further calculate the position of the touch point. The more accurate touch coordinates will be calculated according to the continuous determination data near the central axis, but not limited thereto; in different embodiments, under different components and structures, the one with the lower amplitude of the above two sensing signals The position of a corresponding axis sensing chain can also be used as a basis for judging the position of the touch axis.

In addition, the plurality of axial sensing chains are respectively arranged into an X-axis direction group and a Y-axis direction group and are respectively used to obtain at least one touch coordinate to determine a touch point. In this embodiment, the axial sensing chain is divided into a plurality of intersecting X-axis sensing chains and Y-axis sensing chains, which respectively output a plurality of X-axis sensing signals and Y-axis sensing signals. When the user touches the axis sensor chain, the coordinate calculation module will obtain at least one X-axis coordinate and one Y-axis coordinate from the X-axis sensor signal and the Y-axis sensor signal respectively, and determine the touch point according to the above coordinates where it happened. In addition, in this embodiment, the X-axis induction chain and the Y-axis induction chain intersect each other in a mutually perpendicular manner, but not limited thereto; in different embodiments, the X-axis induction chain and the Y-axis induction chain can also be at other angles Intersect with each other.

FIG. 7 shows another embodiment of the touch detection method shown in FIG. 6 . In this embodiment, the touch detection method further includes step S1000, setting a threshold and step S1010, when the difference between at least one of the two adjacent determination data and the reference value is greater than the threshold, according to the two adjacent The position of the axial sensor corresponding to the judgment data determines the touch point. The threshold in step S1000 is generally set to be greater than the average amplitude of noise in the operating environment. In this embodiment, even if the sequentially adjacent sensing signals are greater than and smaller than the reference value at the same time, the difference between the amplitude of at least one of the sensing signals and the reference value needs to be greater than the threshold. Therefore, the touch detection method of the present invention avoids false detection of non-existing touch points due to noise in the operating environment through the setting of the threshold.

FIG. 8 shows a variant embodiment of the touch detection method shown in FIG. 6, wherein the touch detection method of this embodiment includes step S1100, sequentially assigning two adjacent axial sensors into a plurality of sensor pairs . In this embodiment, every two adjacent axial induction chains form an induction pair. For example, if the touch panel of this embodiment has 8 axial sensing links arranged side by side in sequence, the step S1100 will distribute the above 8 axial sensing links into 7 sensing pairs. Step S1110 includes obtaining the difference of sensing signals of each sensor pair included in the axial sensing chain. In this embodiment, the axial induction signals generated by the axial induction chains of each induction pair will be input into the analog-to-digital converter at the same time, and the analog-to-digital converter will output a difference according to the difference between the received axial induction signals. The differential value is the difference between the axial induction signals output by the above two axial induction chains at the same time point. In step S920 in this embodiment, the differential value is used as the basis for determining the coordinates of the touch point, wherein when two adjacent differential values are respectively greater than and less than a reference value, according to one of the differential values The position of a corresponding axial sensor determines a touch point. In this embodiment, the aforementioned reference value is 0, but it is not limited thereto.

Although the foregoing description and illustrations have disclosed the preferred embodiments of the present invention, it must be understood that various additions, modifications and substitutions may be applied to the preferred embodiments of the present invention without departing from the scope of the attached patent application. spirit and scope of the principles of the invention. Those skilled in the art will appreciate that the invention is possible with many modifications in form, structure, arrangement, proportion, material, element and assembly. Therefore, the embodiments disclosed herein should be regarded as illustrating the present invention rather than limiting the present invention from all viewpoints. The scope of the present invention should be defined by the claims of the appended claims and cover their legal equivalents, not limited by the foregoing description.

Claims (12)

1. touch detection method comprises the following step:

One contact panel is provided, comprises plural number side by side axial induction device in regular turn, wherein each this axial induction device is exported an induced signal;

These induced signals of exporting in one first period according to these axial induction devices produce plural judgement data, in regular turn corresponding to these axial induction devices one of them or in regular turn corresponding to the plural inductor that constitutes by adjacent these axial induction devices to one of them;

When two these adjacent judgement data be respectively greater than and during less than a reference value, according to these judgement data institute these axial induction devices of correspondence or right determining positions one touch points of these inductors.

2. touch detection method as claimed in claim 1, wherein this touch points deciding step comprises

Two these adjacent judgement data be respectively greater than and during less than this reference value, determine a touching coordinate of this touch points at least according at least two these judgement data.

3. touch detection method as claimed in claim 1, wherein should judgement data calculation procedure be contained in one first time point of this first period and obtain the difference of each this inductor comprise of these induced signals of these axial induction devices, as in regular turn to should plural inductor to one of them these judgement data.

4. touch detection method as claimed in claim 1, wherein this contact panel provides step to comprise according to a first direction and a second direction these axial induction devices is arranged in a first direction group and a second direction group respectively, and wherein this first direction is to intersect at this second direction; And

This touch points obtains step and comprises from this first direction group and this second direction group and obtain at least one touching coordinate respectively to determine this touch points.

5. touch detection method as claimed in claim 1, wherein this touch points obtains step and further comprises the following step:

Set a threshold values;

When these two these adjacent judgement data be respectively greater than and during less than this reference value, judge these two adjacent these judgement data at least the difference of one of them and this reference value whether greater than this threshold values; And

When these two adjacent these judgement data at least the difference of one of them and this reference value be during greater than this threshold values, according to these two adjacent these judgement data corresponding these axial induction devices or right this touch points of determining positions of these inductors.

6. touch detection method as claimed in claim 1, wherein this touch points obtains step and further comprises the following step:

Set a threshold values;

When these two these adjacent judgement data be respectively greater than and during less than this reference value, whether the difference of judging these two adjacent these judgement data and this reference value respectively all greater than this threshold values; And

The variation value of judging data when these two adjacent these is with the difference of this reference value during all greater than this threshold values, according to these two adjacent these judgement data these axial induction devices of correspondence or right this touch points of location determination of these inductors.

7. contact panel comprises:

One axial induction group comprises plural number side by side axial induction device in regular turn, and wherein each this axial induction device is exported an induced signal; And

One signal processing module, be electrically connected at this axial induction group to receive these induced signals of these axial induction devices, these induced signals that this signal processing module is exported in one first period according to these axial induction devices produce plural judgement data, in regular turn corresponding to these axial induction devices one of them or in regular turn corresponding to the plural inductor that constitutes by adjacent these axial induction devices to one of them;

When two these adjacent judgement data be respectively greater than and during less than a reference value, this signal processing module will according to these judgement data to should axial induction device or right determining positions one touch points of these inductors.

8. contact panel as claimed in claim 7, wherein when two these adjacent judgement data be respectively greater than and during less than this reference value, this signal processing module is a touching coordinate that determines this touch points according at least two these judgement data.

9. contact panel as claimed in claim 7, wherein these induced signals of these axial induction devices in the difference of one first time point of this first period be as in regular turn to should plural inductor to one of them these judgement data.

10. contact panel as claimed in claim 7, wherein these axial induction devices are arranged in a first direction group and a second direction group with a first direction and a second direction respectively, wherein this first direction is to intersect at this second direction, and this signal processing module is obtained at least one touching coordinate respectively to determine this touch points from this first direction group and this second direction group.

11. contact panel as claimed in claim 7, wherein this signal processing module comprises a threshold values, when these two these adjacent judgement data are respectively greater than reaching less than this reference value, and these two adjacent these judgement data are when the difference of one of them and this reference value is greater than this threshold values at least, this signal processing module will according to these two adjacent these judgement data this touch points of determining positions of corresponding these axial induction devices.

12. contact panel as claimed in claim 7, wherein this signal processing module comprises a threshold values, when these two these adjacent judgement data are respectively greater than reaching less than this reference value, and the difference of these two adjacent these judgement data and this reference value is during all greater than this threshold values, this signal processing module will according to these two adjacent these judgement data this touch points of determining positions of corresponding these axial induction devices.

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