TW201015412A - A method for automatically adjusting capacitance baseline of touch button - Google Patents

Abstract

A method for automatically adjusting capacitance baseline of touch button is applying to a touch button system. The touch button system contains a background capacitance and a finger capacitance. The method includes the steps of: acquiring the capacitance baseline according to a first scan count produced by the background capacitance and the finger capacitance, and setting a relative low threshold according to the capacitance baseline, and then acquiring a second scan count produced by the background capacitance and the finger capacitance. When the second scan count is smaller than the low threshold, the method updates the capacitance baseline based on the second scan count and previous scan counts. Thereof, the present invention can achieve the purpose of ensuring the touch button system can work correctly and judge if the touch buttons pressed accurately.

Description

201015412 IX. Description of the invention: [Technical field of the invention] The present invention relates to a method for automatically adjusting the capacitance (B-) of a button, in particular to a capacitive green of a touch button, for adaptability Adjustment (Adaptive Adju coffee em) automatic adjustment method Jun [previous technology]

Due to the rapid development of technology, computers have gradually become the tools that people use every day. And whether it is a desktop computer, notes =, 疋 personal digital assistant (PDA) 'the host itself has a ^ button or function button (such as: multimedia playback control) for use;: for more direct control The operation of the computer. Γ Tradition in the design of these buttons, most of them are designed with mechanical keys. The mechanical switch button is relatively simple in design. The basin is #^ - a switch principle' to allow the user to press different buttons and release the button (4) to generate different signals (such as logic and logic 1). Related work ^ Open and close control. However, the cost of the mechanical switch button is higher, the life is shorter, and the occupied area is larger. Therefore, under the current trend of increasing cost, beautiful appearance and small product volume, such mechanical buttons have become increasingly incapable of meeting design requirements. Sweat So, there are touch-button design and its application, among which capacitive touch is the most common. Please refer to the first figure for a flow chart of the operation method of the conventional touch button device. The touch button device is, for example, matched with at least one capacitive touch button 埠, and we all know that each capacitive touch button 具有 has a background capacitance (Backgr〇und

Capacitance) and Finger capacitance. 6 201015412 As shown in the first figure, the steps of the operation method of the touch button device include: first, performing an initialization process (S101) to initialize all the capacitive touch buttons on the touch button device to Confirming that the operation is normal, and based on a first scan capacitance value of the capacitive touch button 作为 as a capacitance baseline (S103), thereby serving as a reference for determining whether the capacitive touch button 触发 is triggered, and at this time Since the capacitive touch button 没有 does not receive the touch sensing of the user's finger, the first scan capacitance value (capacitance baseline value) is equal to the capacitance value provided by the background capacitor.紧 Next, it enters an operational state (S105) to detect a second scan capacitance value (sl〇7) generated by the capacitive touch button 随时 at any time. Further, it can be judged whether or not the second scan capacitance value is greater than the capacitance baseline value by a preset value (S109). The preset value varies according to the actual application environment or design requirements. If the determination result in the step (S109) is YES, it means that the capacitive touch button 埠 does receive the touch sensing of the user (the second scanning capacitance value is equal to the sum of the capacitance value of the background capacitance and the capacitance value of the finger capacitance), Therefore, an interrupt signal is generated to the backend system (S109), so that the backend system can perform the function represented by the capacitive touch button. On the other hand, if the result of the step (si〇9) is NO, it means that the capacitive touch button 埠 has not received the touch sensing of the user's finger, so the step (S1〇7) is repeated. At present, if the touch button device is designed in this way, the following disadvantages will occur: Stomach 1. When the user's finger is touch-sensed at the stage of the initialization process, an error will be obtained. The baseline value of the capacitor, which in turn does not function properly. 7 201015412 2. In the state, the capacitance of the background capacitor and the finger capacitor can be changed dynamically due to changes in the system's power supply, ambient temperature, etc. (4). If the baseline value of the capacitor is kept constant, then the delay will not be correct. _ Capacitive touch button 埠 Whether there is a trigger. SUMMARY OF THE INVENTION In view of the above, the technical problem to be solved by the present invention is to provide a method for adjusting the capacitance baseline value of the touch button, in order to enter the galaxing process or enter the operation state of the touch button. The electric valley baseline value can be automatically adjusted to avoid the normal operation of the touch button system or the malfunction during operation. In order to solve the above problem, according to one aspect of the present invention, a method for automatically adjusting a capacitance baseline value of a touch button is provided, which is applied to a button touch system, wherein the touch button includes a background electric ^ and ❿ a finger capacitor, and the method steps include: first, according to a first scan capacitance value generated by the background capacitance and the finger capacitance to obtain a capacitance baseline value, and then set a low limit according to the capacitance baseline value Threshold value. Then, a second scan capacitance value generated by the background capacitance and the finger capacitance is obtained, and when it is determined that the second scan capacitance value is less than the low limit threshold value, the second scan capacitance value and the previous scan capacitance value are used to calculate The new capacitor base value. Therefore, through the above embodiment, the method for automatically adjusting the capacitance baseline value of the touch button of the present invention can instantly adjust the capacitance baseline value regardless of whether the touch button system is in an initialization procedure or a normal operation state. '(4) Due to the time shape and environment of the key to the job, it is necessary to achieve the purpose of normal operation and fine sales. The above summary, the following detailed description and the accompanying drawings are to be taken to illustrate the manner in which the present invention is to achieve the intended purpose. The other objects and advantages of the present invention will be described in the following. Explain in the formula. [Embodiment]

The method for automatically adjusting the capacitance baseline value of the touch button is to first obtain a capacitance-based capacitance (Capadtanee Baseli and the line value to set a low limit threshold value, and then when the obtained scan is at the low limit threshold value) The obtained scan capacitance value is used to calculate a new capacitance baseline value as a reference for the touch button triggering. The present invention is applied to a capacitive touch button system, and those skilled in the art should be able to understand 'touch. The button system can be applied to various electronic devices, and includes at least a touch button, a capacitance detecting unit and a control unit, wherein the touch button further has a background capacitance (capacitance) and a finger capacitance. When the user touches the touch button with the finger, the user can receive the background capacitance and the finger capacitance induced by the operation of the capacitance detecting unit - Scan c〇unt, $ Then adjust the adjustment with the operation of the control unit. Wherein, when a user touches the touch sensor button B, the scan capacitance value is the sum of the capacitance value of the background capacitor and the capacitance value of the finger capacitor; 阙 'If no finger is connected to the thief, the touch button should be touched. The scan capacitance value is only the capacitance value of the background capacitor. 201015412 May refers to the second figure, which is a flow chart of a method for automatically adjusting the capacitance baseline value of the touch button according to the present invention. As shown in the figure, the embodiment provides a method for automatically adjusting the capacitance baseline value of the touch button, and the steps include: first, when the electric device and the sub-device start to operate, start the touch button system (S2^1), At this time, the touch button system is obtained according to the background capacitance and the value of the first-scanning capacitance generated by the finger H. The capacitance baseline value (IS203) 〇❹ ❹ Next, the embodiment will set according to the obtained capacitance baseline value. One

ThreshGld)(S2G5)° Further, the standby finger is used to receive the button. *When the moneyer has the hand touch button, the background capacitance and the finger-to-second scan capacitance value (S2G7) are further obtained. Then, a judgment is made as to whether the value of the capacitance is less than the lower limit value (S209). If the result of the determination in the step (S209) is YES, then the table * is currently based on the judgment criterion of the current actual situation f, that is, the original abnormality is generated when the wire value is obtained. Yu Yu conveniently uses the second scan capacitance value and the previous j electric valley value to calculate the latest capacitance baseline value, and the progression table is reversed. If the determination result of the step (s2G9) is no, the reference second ^ the capacitance baseline value For the triggering of the touch button 201015412 Finally, after the step (S213), the method for automatically adjusting the capacitance baseline value of the touch button provided by the embodiment is completed. Then, the steps (82〇7) can be repeated according to the actual application conditions, or other design actions can be performed, and there is no limitation here. The above embodiment is merely an overall conceptual concept of the method for automatically adjusting the baseline value of the touch button of the present invention, and we all know that the operation of the entire touch key system is too rich, including the initial initialization.

The red sequence and the normal operating state after the initialization program. Therefore, please refer to the following description to further describe the detailed operation of the present invention in the difficult button system when starting the process and entering the normal operation state. The present invention refers to the second figure, which is a flowchart of the automatic adjustment of the initialization procedure of the present invention. As shown in the figure, the first detail is used to describe the method of automatically adjusting the base value of the method key in the touch key to start the initial sequence (S30D operation situation. It is to first sample a plurality of sample capacitance values. Perform an averaging operation to generate a so-called first scan power and then obtain a capacitance baseline according to the first scan capacitance value. 5. When the touch button system performs an initialization process, the most =: ΐί has no user finger The contact inductance, and the capacitance value of the background capacitance of the first-scan capacitor, so the baseline value of the 4-scan capacitor is the correct capacitance baseline value. However, if the contact sensing is performed when the initialization process is performed, Then, the first-scan capacitance value of the finger power π is the sum of the capacitance value of the background capacitor and the capacitance: the value of the :: or the value of the background capacitance due to misjudgment. Therefore, in order to adapt to various possible conditions, 201015412 The design of the scan capacitance value and the average operation of the sampled sample designed in this embodiment is (4) setting the first scan time of the average operation_money as the capacitance baseline value. Incidentally, the sampling method and the number of the sample scanning capacitance values can be, for example, designed to obtain a flip-flop value every other set time in the initialization procedure of the initialization program, and the money can be obtained in the specific Xiangzhong. The value of the scan capacitor is used as the sample scan capacitance value.

^者's actual_input (four) capacitor baseline value is set to the low limit threshold (S307)' and the acquisition of the so-called second, the second scan capacitance value represents the above-mentioned special Then obtain the obtained scan capacitance value. Thus, it can be judged whether the second scan capacitance value is smaller than the low limit threshold (S3U). If the result of the step (S311) is YES, it means that the first temple is obtained, and the contact sensitivity of the user's finger is detected, and the user is not detected when the second scan capacitance value is paid. Contact sensing of the finger. Thus, the updated capacitance baseline value (S313) is updated to adjust the current valley value by adaptively adjusting the currently obtained second scan capacitance value. Then continue with the step (S3G7) and its subsequent steps until the initialization process is completed. #7 If the result of the step (S311) is No, that is, the second woman's electric valley is greater than or specific to the lower limit threshold, and this means that there are the following cases. The first case is originally obtained. The first-scanning capacitance value is that there is no contact sensing to the user's finger, and the current finger is in contact with the touch sensor; the second case is that the contact sensor of the user's finger is not detected when sweeping the heart value, and 12 201015412 At present, when the second scan value is obtained, there is no contact sensing of the user's finger; in the third case, when the first scan capacitance value is obtained, the contact sensor of the money user's finger is obtained, and the second scan is obtained. The capacitance value is also the contact sensing of the user's finger. For the above three cases, it is confirmed that the baseline value of the capacitance originally obtained according to the first scan capacitance value is the touch button_sending reference (S315), and after the step _5) is executed, the step (S309) is repeated. And then follow the steps until the initialization process is completed. ° • In this way, when the touch button system is initialized, it can be operated smoothly by adaptive adjustment regardless of the influence of the text on the user's finger contact. Please refer to the fourth figure again for a flow chart of an embodiment of the automatic adjustment method in the normal operation state of the present invention. As shown in the figure, the first method for explaining the method of automatically adjusting the capacitance baseline value of the touch button is performed when the touch button system is started to enter the normal operation state (S401). The same is based on the first scan capacitance value generated by the background electric valley and the finger capacitance to obtain the capacitance base φ line value (S403). However, since this embodiment is for explaining the operation situation in which the normal operation state has been entered, the capacitance baseline value therein may be, for example, taken from the last obtained capacitance baseline value in the initialization procedure. In the normal operation state of the touch button system, the capacitance value of the background capacitor and the capacitance value of the finger capacitor are relatively changed in order to avoid the change of the external factors such as the power supply change of the touch button system and the ambient temperature. The touch button system cannot correctly determine whether the current touch button has a trigger. Therefore, in this embodiment, a low threshold value and a high limit threshold value are further set according to the baseline value of the capacitor (twist 13 201015412)

Threshold) (S405). For the sake of convenience of explanation, please refer to FIG. 4 together with reference to FIG. 4', which is a schematic diagram of an embodiment of the high limit threshold and the low limit threshold in the normal operation state of the present invention. The high threshold value Η is, for example, designed as a sum of a capacitance baseline value and a predetermined capacitance value X (H = Baseline + X); and the low limit threshold L is, for example, designed as a capacitance baseline value and a preset capacitance value. The sum of the half X/2 (L == Basdine + X/2), and the preset capacitance value is a rated minimum effective capacitance value of at least the finger valley of the touch button. Of course, this formula design is only one of the embodiments of φ, and is not intended to limit the present invention. Immediately thereafter, the touch button system can wait for the user's finger contact sensing at any time during normal operation to obtain the second scan capacitance value (S407). If it is detected that the user's finger performs the contact sensing, it is judged whether the second scanning capacitance value is greater than the high limit threshold h (S409). If the result of the step (S409) is YES, it indicates that the second scan capacitance value generated is greater than the high limit threshold Η, and the capacitance value of the background capacitance and the capacitance value of the finger capacitance are not changed by external factors. Therefore, it is confirmed that the current capacitance baseline value is the trigger reference of the touch button, and an interrupt signal is output to the back end electronic device (S411), so that the electronic device performs the corresponding touch button function. If the judgment of step (S4〇9), =, is no, it means that the second scan capacitance value generated is less than or equal to 咼, the critical value Η, that is, the current capacitance of the background capacitor and the power of the finger capacitor. Each value may vary due to an external factor, and therefore, it is determined whether the second scan capacitance value is less than the low limit threshold L (S413). If the result of the determination in step (S413) is YES, it indicates that the second scan capacitance value is indeed less than the low limit threshold L, that is, the current capacitance value of the background capacitor 14 201015412 and the finger power (10) capacitance value may be due to changes in external factors. Confirmation will result in a large error, so the capacitor baseline value (S4i5) is updated to proceed. The monthly adaptation m is based on the current second scan capacitance value to repair the capacitor base. And the steps (lake) and its subsequent steps are continued to be adaptively adjusted at any time. w ί中本=&amp The correction of the electric value according to the third scan capacitance value in the example is to make the second scan capacitance value and the first scan ❹ ❹ to be the original 7-capacitance baseline value in the case of 5 and 6 in the case, as shown in the following formula. t two " update the electricity valley baseline value. If the actual situation is mandatory, the current example will be averaged with all the scan capacitance values obtained.

Baseline

If the judgment result of Z1 η 朗(S413) is NO, it means that the second field electric valley value is less than or equal to the high limit threshold value Η, and is greater than or equal to the low limit £a threshold value L·. At this time, in the case of setting the bucket μ, it is determined that it is impossible to clearly confirm whether or not the sputum phase (n) capacity baseline = ?, but the interrupt generator library is not output: the execution step (_). The familiarity with the behavior of the technology is not to obtain the above-mentioned value, but to refer to the second---fourth capacitor-off judgment wire, and to update the capacitor. Baseline value. (4) By repeating the step flow of this embodiment, the touch can be changed according to the external factors at any time by pressing ===: The adaptive adjustment of the baseline value of the electric valley is ordered. 201015412 In summary, the method for automatically adjusting the capacitance f-line value of the touch button provided by the present invention is mainly for automatically performing the capacitance baseline value under the touch control (4) Osaki initialization program or 2 entering the operating state. The adaptive adjustment can achieve the purpose of ensuring the normal operation and accurate judgment of the touch button system in response to the use of the touch button system and the environmental conditions. However, the above description is only for the detailed description and drawings of the specific embodiments of the present invention, and is not intended to limit the scope of the invention. Any change or modification that can be easily conceived in the field of the invention can be covered by the scope of the patent defined by the document. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a flow chart of a method for operating a touch button device of the prior art; FIG. 1 is a flow chart of a method for automatically adjusting a capacitance baseline value of a touch button according to the present invention;

The figure is a flow chart of the automatic adjustment method of the initialization program of the present invention; <L fourth figure is a flowchart of an embodiment of the automatic adjustment method of the present invention in a normal operation state; and 第五 ^ The fifth figure is the normal operation state of the present invention A schematic diagram of an embodiment of the lower limit threshold and the lower limit threshold. 〃 _ [Main component symbol description] [Practical technology]

Sl〇i~sill Conventional Technology Flowchart Step Description 16 201015412 [Invention] Η High limit threshold L Low limit threshold S201~S213 Flowchart step description S301~S315 Flowchart step description S401~S417 Flowchart step description

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Claims (1)

201015412 X. Patent application scope: 1. A method for automatically adjusting the capacitance baseline value of a touch button is applied to a button touch system, the touch button system includes a background capacitor and a finger capacitor, and the method steps The method includes: obtaining a capacitance baseline value according to the background capacitance and a “first scan capacitance value” generated by the finger capacitance; setting a low limit threshold according to the capacitance baseline value; obtaining the background capacitance and the finger capacitance - the capacitance value; and when the two-two scan capacitance value is less than the low limit threshold value, the first scan capacitance value is used to correct the capacitance baseline value. 2 电 The electric method for automatically adjusting the touch button described in the first item of the patent range, wherein when the button touch system performs the initialization process, the method further comprises: taking a scan capacitance value to perform an averaging operation to generate 5 a scan capacitor value; and the capacitor base shape becomes the low limit threshold. For example, if the method of applying the patented range baseline value is adopted, the power of the touch button is automatically adjusted: the off: the value of the second or second scan capacitor is greater than or equal to the threshold value. The baseline value of the quasi-capacitance is a trigger of the touch button. For example, if the method of applying the baseline value of the first item of the patent scope is to adjust the normal operation state of the touch button, the second touch system is entered into - positive 4 201015412, according to the baseline value of the capacitor, the setting is advanced. Limit threshold. The method of automatically adjusting the baseline values of the touch buttons according to the fourth patent of the patent, the method further includes: after obtaining the _ two-scan capacitance value, the second scanning capacitance is less than or equal to the secret When the gg boundary value is determined, it is determined whether the second scan capacitance value is less than the low limit threshold value; and after the second scan capacitance value is obtained, determining that the second display capacitance is greater than the high limit threshold value, The baseline value of the capacitor is an output-interrupt signal of a trigger reference of the touch button. 6. The method for automatically adjusting the capacitance baseline value of the touch button according to the fifth item of the patent scope further includes: when determining that the 4th sweep & capacitance value is greater than or equal to the low limit threshold value, the capacitor is confirmed The baseline value is the trigger reference for the touch button. The method of automatically adjusting the baseline value of the touch button of the touch button according to the sixth aspect of the claim, wherein the second scan capacitor value is further subjected to an average operation with the first scan capacitor value to correct Update the baseline value of this capacitor. = The method of automatically adjusting the touch button's power ☆ baseline value as described in item 4 of the patent scope of the patent, the high limit threshold of the towel is designed as the sum of the capacitance baseline value and the preset capacitance value, and the low The limit threshold is the sum of the capacitance of the capacitor and the set value of the capacitor. = The method for automatically adjusting the voltage of the touch button, the line value, as described in item 8 of the patent scope, wherein the predetermined capacitance value is at least a rated minimum effective capacitance value of the finger valley. 19