TWI622921B - Capacitance value detecting method of touch device - Google Patents

Abstract

The present invention relates to a method for detecting a capacitance value of a touch device, comprising the steps of: providing a touch device; detecting an initial capacitance value of at least one detected point of the touch device, and setting a starting capacitance value as a basic capacitance Value; detecting the instantaneous capacitance value of the detected point, subtracting the instantaneous capacitance value from the basic capacitance value to obtain a difference, and determining whether the difference is greater than the threshold value; calculating the coordinate value of the detected point and recording; determining the difference Whether the value is less than the threshold value; waiting for a set time, stopping calculating the difference between the instantaneous capacitance value and the base capacitance value within the set time; and updating the base capacitance value according to the instantaneous capacitance value. In this way, it is possible to prevent the touch device from being misjudged as being touched due to the micro-deformation of the mechanism, thereby improving the accuracy of the touch device determining whether the touch is or not.

Description

Capacitance value detection method of touch device

The present invention relates to a method for detecting a capacitance value of a touch device, and more particularly to a method for detecting a capacitance value based on a value of a transient capacitance value.

With the advancement of technology, various touch devices have also developed. Compared with the traditional mouse or button operation mode, the touch operation mode has the advantages of being simpler and more user-friendly. According to the principle, the touch device can be divided into a resistive type, a capacitive type, an acoustic wave type, and an infrared type. The capacitive touch device is widely used in electronic devices such as smart phones and tablet computers.

In general, a capacitive touch device detects whether a device is touched by detecting a change in a capacitance value of the touch device. That is, when the capacitance value detected by the touch device exceeds a certain size, the touch device determines that the touch device is touched and performs a corresponding action.

However, since the capacitance value also changes due to environmental factors, the touch device generates an erroneous determination when it is not touched, and performs an action that is not expected by the operator. Or, due to the micro-deformation of the mechanism of the touch device, the detected capacitance value is too high, and the error is judged to be touched.

Therefore, how to develop a capacitance value detection method different from the touch device to improve the problems and shortcomings in the prior art, so as to avoid the change of the capacitance value caused by environmental factors, and the touch device is erroneously determined to be subject to Touching, while avoiding the micro-deformation of the touch device, the false detection of the detected capacitance value is subject to touch, thereby improving the accuracy of the touch device determining whether the touch is or not, which is currently the technical field. Key topics in the process.

The main purpose of the present invention is to provide a method for detecting a capacitance value of a touch device, which solves and improves the problems and disadvantages of the foregoing prior art.

Another object of the present invention is to provide a method for detecting a capacitance value of a touch device. After determining that the touch device is touched, it waits for a set time, and stops calculating the difference between the instantaneous capacitance value and the basic capacitance value within the set time. In order to prevent the touch device from being misjudged as being touched due to the micro-deformation of the mechanism, the accuracy of the touch device determining whether the touch is controlled or not is improved.

Another object of the present invention is to provide a capacitance detecting method for a touch device, which is to update the basic capacitance value according to the instantaneous capacitance value when the difference between the instantaneous capacitance value and the basic capacitance value is less than the threshold value, so as to cause environmental factors The change in capacitance value does not cause the touch device to be determined to be touched.

Another object of the present invention is to provide a method for detecting a capacitance value of a touch device. When a difference between a instantaneous capacitance value of a plurality of detected points and a base capacitance value is a negative value, the method is based on a plurality of detected points. The instantaneous capacitance value updates the base capacitance value to avoid the misjudgment of the touch caused by the abnormality of the large area negative value.

Another object of the present invention is to provide a method for detecting a capacitance value of a touch device. When determining that a difference between a plurality of detected points is a negative value, waiting for a set time, stopping calculating the instantaneous capacitance within the set time. The difference between the value and the value of the base capacitor is to avoid the occurrence of a misjudgment due to an abnormal situation, thereby improving the accuracy of the touch device determining whether the touch is or not.

In order to achieve the above object, a preferred embodiment of the present invention provides a method for detecting a capacitance value of a touch device, comprising the steps of: (a) providing a touch device; and (b) detecting at least one of the touch device. The starting capacitance value is set by one of the detected points, and the initial capacitance value is set to a basic capacitance value; (c) detecting a transient capacitance value of the detected point, the instantaneous capacitance value and the basic capacitance value Subtracting to obtain a difference, and determining whether the difference is greater than a threshold; (d) calculating the coordinate value of the detected point and recording; (e) determining whether the difference is less than the threshold; (f) waiting a set time, stopping to calculate a difference between the instantaneous capacitance value and the base capacitance value within the set time; and (g) updating the base capacitance value according to the instantaneous capacitance value; wherein, the judgment result of the step (c) If yes, the step (d) and the step (e) are performed after the step (c); if the result of the step (c) is no, the step (c) is performed after the step (c) And re-executing the steps after the step (b); and when the judgment result of the step (e) is YES, after the step (e) Performing the step (f) and re-executing the step after the step (b); when the judgment result of the step (e) is no, the step (d) is executed after the step (e), and the step is re-executed Step (e).

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in various aspects, and is not intended to limit the scope of the invention.

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , wherein FIG. 1 is a flow chart showing a method for detecting a capacitance value of a touch device according to a preferred embodiment of the present invention, and FIG. 2 is a view showing a preferred embodiment of the present invention. The block diagram of the touch device used for the capacitance value detection method, and the third figure show the time-instantaneous capacitance value relationship diagram of the touch device of the present invention. As shown in FIG. 1 , FIG. 2 and FIG. 3 , the method for detecting the capacitance value of the touch device according to the preferred embodiment of the present invention includes the following steps. First, as shown in step S10 , the touch device 1 is provided. The touch device 1 is, for example but not limited to, a touch mobile phone. Next, as shown in step S20, the initial capacitance value of at least one detected point of the touch device 1 is detected, and the initial capacitance value is set as the basic capacitance value.

Then, as shown in step S30, detecting the instantaneous capacitance value of the detected point, subtracting the instantaneous capacitance value from the basic capacitance value to obtain a difference, and determining whether the difference is greater than a threshold value. If the result of the determination in step S30 is YES, that is, the touch device 1 is touched, step S30 is followed by step S40 and step S50. Step S40 is to calculate the coordinate value of the detected point and record it to make the touch. The device 1 performs a corresponding action according to the coordinate value, and step S50 determines whether the difference is less than the threshold value. If the result of the determination in step S50 is YES, that is, the touch device 1 is no longer touched, the step S60 is performed after the step S50, and the step after the step S20 is re-executed, wherein the step S60 waits for a set time. The calculation of the difference between the instantaneous capacitance value and the base capacitance value is stopped within the set time. In some embodiments, if the result of the determination in step S50 is no, that is, the touch device 1 is still touched, step S40 is performed to perform the step S40 to calculate the coordinate value of the detected point and record, and then re- Step S50 is performed.

In some embodiments, when the result of the determination in step S30 is no, step S70 is performed after step S30, and the step after step S20 is re-executed, wherein step S70 updates the base capacitance value according to the instantaneous capacitance value. In other embodiments, when the determination result in step S30 is no, and the difference is not less than the negative noise threshold and not greater than the positive noise threshold, the instantaneous capacitance value may be an environment such as temperature and humidity. The factor is caused by performing step S70 after step S30, and updating the basic capacitance value according to the instantaneous capacitance value, so that the change of the capacitance value caused by the environmental factor does not cause the touch device to determine that it is touched.

According to the concept of the present invention, the touch device 1 includes a plurality of sensing elements 10, a control element 11 and a storage element 12, wherein the sensing element 10 is a capacitive touch sensor, such as an In-cell in-cell touch. The control unit 11 is, for example, a control chip, a microprocessor or a central processing unit, and the storage unit 12 is, for example, a flash memory or a hard disk, but is not limited thereto. The plurality of sensing elements 10 are used to detect the initial capacitance value and the instantaneous capacitance value of each of the plurality of detected points of the touch device 1 . The control element 11 is connected to the plurality of sensing elements 10, and receives the initial capacitance value and the instantaneous capacitance value to implement step S20, step S30, step S40, step S50, step S60, and step S70. The storage element 12 is coupled to the control element 11 to store initial capacitance values and instantaneous capacitance values.

In some embodiments, the detected point of the touch device 1 is subjected to a recovery time when the external force generating mechanism is slightly deformed, and the set time is greater than or equal to the recovery time to avoid the touch device 1 due to its mechanism. Micro-deformation, which is a case of misjudgment as being touched. In other embodiments, the set time is, for example, no less than 1 second and no more than 2 seconds. In still other embodiments, the control component 11 analyzes the instantaneous capacitance value and the base capacitance value stored in the storage component 12 to obtain a recovery time required for each detected point to be restored by the micro-deformation of the external force generating mechanism. The set time of each detected point is dynamically adjusted and/or dynamically compensated so that the set time is greater than or equal to the recovery time, but not limited thereto.

For example, as shown in FIG. 3, at time t1 to t2, the difference between the instantaneous capacitance value of the detected point of the touch device 1 and the base capacitance value is greater than the threshold value, that is, the touch device 1 is touched. Calculate the coordinate value of the detected point and record it so that the touch device 1 performs a corresponding action according to the coordinate value. After the time t2, the difference is less than the threshold value, that is, the touch device 1 is no longer touched. At time t2 to t3, the detected point is slightly deformed by the external force generating mechanism, and must be restored by a recovery time, and the set time is greater than or equal to the recovery time.

In other words, the method for detecting the capacitance value of the touch device of the present invention is to wait for a set time after the touch device is touched, and stop calculating the difference between the instantaneous capacitance value and the basic capacitance value within the set time to avoid touching. Due to the micro-deformation of the mechanism, the control device is misjudged as being touched, thereby improving the accuracy of the touch device determining whether the touch is or not. Moreover, when the difference between the instantaneous capacitance value and the basic capacitance value is less than the threshold value, the basic capacitance value is updated according to the instantaneous capacitance value, so that the change of the capacitance value caused by the environmental factor does not cause the touch device to be determined to be touched.

Please refer to FIG. 4, which is a flow chart showing a method for detecting a capacitance value of a touch device according to another preferred embodiment of the present invention. As shown in FIG. 4, step S20 of the method for detecting the capacitance value of the touch device according to another preferred embodiment of the present invention detects a plurality of initial capacitance values of the plurality of detected points of the touch device 1 and The plurality of starting capacitor values are set to a plurality of base capacitor values. In some embodiments, step S20 includes steps S201 and S202, wherein step S201 detects the plurality of instantaneous capacitance values of the plurality of detected points, and the plurality of detected points are plural. The instantaneous capacitance value is subtracted from the plurality of basic capacitance values to obtain a plurality of difference values, and the plurality of difference values are determined to be negative values. Step S202 is to update the plurality of the plurality of instantaneous capacitance values of the plurality of detected points. Base capacitance value. When the result of the determination in step S201 is YES, step S202 is executed after step S201, and step S201 is re-executed; if the result of the determination in step S201 is no, step S30 is performed after step S201.

In other words, the capacitance value detection method of the touch device in the present case is based on the instantaneous capacitance value of the plurality of detected points when the difference between the instantaneous capacitance value and the basic capacitance value of the plurality of detected points is a negative value. Update the base capacitance value to avoid the misjudgment of touch caused by abnormal conditions of large area negative values.

Please refer to FIG. 5A and FIG. 5B . FIG. 5A and FIG. 5B are flowcharts showing a method for detecting a capacitance value of a touch device according to another preferred embodiment of the present invention. It is represented by two figures, wherein A and B of Fig. 5A are connected to A and B of Fig. 5B, respectively. As shown in FIG. 5A and FIG. 5B, step S201 includes step S2010, and step S2010 waits for the set time, and stops calculating a plurality of differences between the plurality of instantaneous capacitance values and the plurality of basic capacitance values within the set time. And detecting a plurality of instantaneous capacitance values of the plurality of detected points, subtracting the instantaneous capacitance values of the plurality of detected points from the plurality of basic capacitance values to obtain a plurality of differences, and determining the plurality of differences Whether the value is negative. If the result of the determination in step S201 is YES, step S2010 is performed after step S201; if the result of the determination in step S201 is no, step S30 is performed after step S201; and when the result of step S2010 is YES, it is in the step After S2010, step S202 is performed, and step S201 is re-executed; if the result of step S2010 is no, step S30 is performed after step S2010.

Therefore, the capacitance value detecting method of the touch device of the present invention waits for a set time when determining that the difference between the plurality of detected points is a negative value, and stops calculating the instantaneous capacitance value and the basis within the set time. The difference between the capacitance values to avoid the misjudgment of being touched due to abnormal conditions, thereby improving the accuracy of the touch device determining whether the touch is or not.

In summary, the present invention provides a method for detecting a capacitance value of a touch device. After determining that the touch device is touched, it waits for a set time to stop calculating the instantaneous capacitance value and the basic capacitance value within the set time. The difference is to prevent the touch device from being misjudged as being touched due to the micro-deformation of the mechanism, thereby improving the accuracy of the touch device determining whether the touch is or not. Moreover, when the difference between the instantaneous capacitance value and the basic capacitance value is less than the threshold value, the basic capacitance value is updated according to the instantaneous capacitance value, so that the change of the capacitance value caused by the environmental factor does not cause the touch device to be determined to be touched. At the same time, when the difference between the instantaneous capacitance value of the plurality of detected points and the basic capacitance value is a negative value, the basic capacitance value is updated according to the instantaneous capacitance values of the plurality of detected points to avoid a large area negative value. The normal situation causes the touch to be misjudged. And when determining that the difference between the plurality of detected points is a negative value, waiting for a set time, stopping calculating the difference between the instantaneous capacitance value and the basic capacitance value within the set time to avoid an abnormal situation. A misjudgment is caused by the touch, thereby improving the accuracy of the touch device determining whether the touch is or not.

The present invention has been described in detail by the above-described embodiments, and may be modified by those skilled in the art, without departing from the scope of the appended claims.

S10, S20, S30, S40, S50, S60, S70, S201, S202, S2010‧‧
1‧‧‧ touch device
10‧‧‧Sensor components
11‧‧‧Control elements
12‧‧‧Storage components
T1, t2, t3‧‧‧ time

FIG. 1 is a flow chart showing a method for detecting a capacitance value of a touch device according to a preferred embodiment of the present invention. FIG. 2 is a block diagram showing the structure of a touch device to which the capacitance value detecting method of the preferred embodiment of the present invention is applied. Figure 3 is a graph showing the time-instantaneous capacitance value of the touch device of the present invention. FIG. 4 is a flow chart showing a method for detecting a capacitance value of a touch device according to another preferred embodiment of the present invention. 5A and 5B are flowcharts showing a method for detecting a capacitance value of a touch device according to still another preferred embodiment of the present invention.

Claims (10)

A method for detecting a capacitance value of a touch device includes the steps of: (a) providing a touch device; (b) detecting an initial capacitance value of at least one detected point of the touch device, and detecting the start The capacitance value is set to a basic capacitance value; (c) detecting a transient capacitance value of the detected point, subtracting the instantaneous capacitance value from the basic capacitance value to obtain a difference, and determining whether the difference is greater than one (d) Calculate the coordinate value of the detected point and record it; (e) Determine whether the difference is less than the threshold value; (f) Wait for a set time, stop calculating the instantaneous capacitance value within the set time And the difference between the base capacitance value; and (g) updating the base capacitance value according to the instantaneous capacitance value; wherein, when the determination result of the step (c) is YES, the step is performed after the step (c) ( d) and the step (e); when the judgment result of the step (c) is no, the step (g) is performed after the step (c), and the step after the step (b) is re-executed; The judgment result of the step (e) is YES, after the step (e) is performed, and after the step (b) is re-executed Step; if the determination in step (e) the result is NO, execution of the step (d) to the system after the step (e), and re-executing the step (e). The method for detecting a capacitance value of a touch device according to the first aspect of the invention, wherein the step (b) detects a plurality of initial capacitance values of the plurality of detected points of the touch device, and The plurality of starting capacitance values are set to a plurality of base capacitance values. The method for detecting a capacitance value of a touch device according to claim 2, wherein the step (b) comprises the following steps: (b1) detecting the plurality of instantaneous capacitance values of the plurality of detected points And subtracting the plurality of instantaneous capacitance values of the plurality of detected points from the plurality of basic capacitance values to obtain a plurality of differences, determining whether the plurality of differences are negative values; and (b2) determining, according to the plurality of The plurality of instantaneous capacitance values of the detection point update the plurality of base capacitance values. The method for detecting a capacitance value of a touch device according to claim 3, wherein when the determination result of the step (b1) is YES, the step (b2) is performed after the step (b1), and This step (b1) is performed; when the judgment result of the step (b1) is NO, the step (c) is executed after the step (b1). The method for detecting a capacitance value of the touch device according to the fourth aspect of the invention, wherein the step (b1) further comprises the step (b10): waiting for the set time, stopping calculating the plurality of instantaneous capacitors within the set time. a plurality of differences between the value and the plurality of base capacitance values, and detecting a plurality of instantaneous capacitance values of the plurality of detected points, and comparing the instantaneous capacitance values of the plurality of detected points with the plurality of basic capacitance values Subtracting a plurality of differences and determining whether the plurality of differences are negative. The method for detecting a capacitance value of a touch device according to claim 5, wherein when the result of the step (b1) is YES, the step (b10) is performed after the step (b1); If the judgment result of (b1) is no, the step (c) is performed after the step (b1); and when the judgment result of the step (b10) is YES, the step (b2) is performed after the step (b10). And re-executing the step (b1); when the judgment result of the step (b10) is NO, the step (c) is executed after the step (b10). The method for detecting the capacitance value of the touch device according to the first aspect of the invention, wherein the detected point of the touch device is subjected to a recovery time by the external force generating mechanism, and the set time is greater than Or equal to the recovery time. The method for detecting a capacitance value of a touch device according to claim 1, wherein the set time is not less than 1 second and not more than 2 seconds. The method for detecting a capacitance value of a touch device according to the first aspect of the invention, wherein the determination result of the step (c) is no, and the difference is not less than a negative noise threshold and not greater than one. When the noise threshold is positive, the step (g) is performed after the step (c). The method of detecting a capacitance value of a touch device according to the first aspect of the invention, wherein the touch device comprises: a plurality of sensing elements for detecting the plurality of detected points of the touch device The starting capacitance value and the instantaneous capacitance value of each of the detection points; a control component is connected to the plurality of sensing elements, and receives the initial capacitance value and the instantaneous capacitance value to implement the step ( b), step (c), step (d), step (e), step (f), and step (g); and a storage element coupled to the control element to store the initial capacitance value and the Instantaneous capacitance value.