TW202134848A - Multi-mode operation method for capacitive touch panel - Google Patents

Abstract

A multi-mode operation method for a capacitive touch panel is disclosed. The panel has a plurality of touch cells, and detection values of the plurality of touch cells are obtained by mutual capacitance scan. A normal mode and an insulation mode are provided for situations in which the panel is touched by a finger and a glove, respectively. An insulation determination condition is established for automatically determining glove touch to make the panel enter the insulation mode. In the insulation mode, the criteria for determining touch events can be automatically adjusted, or the detection values around the cells touched can be processed to accurately determine the touch effect when the panel is touched by a glove. In the insulation mode, a condition for determining to leave the insulation mode is also established, so that the touch panel can be smoothly switched between the normal mode and the insulation mode. The panel can be further provided with other operation modes, such as waterproof mode and water mode, which can recognize normal finger touch, glove touch, finger touch when the panel is in contact with water, and finger touch when the panel is immersed in water.

Description

Multi-mode operation method of capacitive touch panel

The present invention relates to a multi-mode operation method of a capacitive touch panel, and particularly relates to a waterproof mode and an isolation mode operation method of a capacitive touch panel using mutual control scanning.

Capacitive touch panels have been widely used in various types of electronic or computing devices, especially Electronic devices such as mobile phones, tablet computers, and notebook computers. Capacitive touch panels often face very different operating environments. For example, in an outdoor low-temperature environment, users want to wear gloves to directly operate the touch panel, so the distance between the finger and the touch panel is more than the thickness of the glove. It is necessary to increase the sensitivity of the touch panel to operate normally like finger touch. In order to deal with the use status of wearing gloves, Taiwan Patent No. TWI511012 discloses setting a lower judgment standard and judging the signal value of the adjacent grid to identify the insulated touch input. Since gloves are non-conductive insulating materials, the touch method of insulating objects such as gloves between the fingers and the touch panel is called insulated touch.

US Patent No. US9,778,742 discloses setting different sensitivity parameters to scan the touch surface The sensing signal value of the board, in the state of increasing the sensitivity, if the continuous multiple data reaches the touch judgment standard of the glove mode, it will enter the glove operation mode, or called the insulation mode, to recognize the touch effect of the glove touch. The problem of the above prior art is that if the touch panel is stained with water droplets, it may be misjudged to enter the insulation mode. After the insulation mode is not actually touched by wearing gloves, it is easy to misjudge due to the increased sensitivity. For example, if you get rainwater outdoors, or the user wipes the screen with toilet paper, because the water also has a certain degree of conductivity, it will cause the touch panel to change the sensing signal value, and it may enter the glove mode, and it is easy to falsely report due to water droplets. point.

Therefore, a more complete identification method is needed to correctly judge the insulation mode and identify Recognize the touch effect of wearing gloves. Moreover, when the touch panel is wet, it can also enter the waterproof mode to avoid false alarms due to the water, and it can correctly recognize the effect of the finger touch, and realize the capacitive type that can effectively judge the touch effect in a variety of different modes. Touch panel technology.

According to the present invention, it is possible to accurately judge various operation modes and provide In the formula, the capacitive touch panel technology can effectively determine the touch effect.

According to the present invention, the capacitive touch panel has a plurality of touch grids to scan through mutual capacitance. The formula obtains the sensing values of the plurality of touch panels, and includes a normal mode and an insulation mode, and determines whether to enter the insulation mode according to the following insulation judgment conditions: the sensing values in all touch panels are less than one Normal touch threshold; there is a touch grid with a sensing value greater than an insulated touch threshold. At this time, the insulated touch threshold is the effective touch standard value, or after the sensing value is amplified, there is a touch greater than the normal touch threshold At this time, the normal touch threshold is the effective touch standard value, and the sensor values of the upper, lower, left, and right adjacent cells of the touch cell are all less than the sensor value of the touch cell. If it meets the above description, then An insulated touch point is formed; and the insulated touch point continues to exist, and the moving distance is greater than a predetermined distance, or does not move, but disappears within a short period of time and it is judged that another insulated touch point appears near the original place.

According to the present invention, when the insulation judgment condition is executed, it is further restricted that only There can be an insulated touch point, or the sensing value of all touch panels cannot be less than the lower threshold.

According to the insulation judgment condition of the present invention, the movement distance of the insulation touch point is judged to be If it is greater than the predetermined distance, it is further restricted that the movement track of the insulating touch point is a back and forth movement or a polygonal track.

According to the present invention, it further includes that before the insulation judgment condition is executed, all touch controls The induction value of the grid is first processed as follows: at the initial stage of the panel, the induction value of each grid is obtained as the reference value of each grid; and each time the induction value of each grid is obtained, the induction value of each grid is subtracted The reference value, and then execute the insulation judgment condition based on the calculated new induction value; in addition, after subtracting the reference value of each grid from the induction value of each grid, a stable interval can be set. When there is no touch event, if After the calculated new induction value is higher than the upper limit of the stability interval, the new induction value will be subtracted by a compensation value, and the reference value of the grid will be added to the compensation value. If the calculated new induction value is lower than this If the stability interval is lower than the limit, the compensation value will be added to the new sensing value, and the reference value of the grid will be subtracted from the sensing value of the compensation value; in addition, when the insulation touch point exists when the insulation judgment condition is executed, The calculation of adding or subtracting the compensation value can be suspended.

According to the present invention, in the insulation mode, the sensing values of all touch cells are amplified and then based on the The normal touch threshold is used as the effective touch standard value to determine the effective touch, or the insulated touch threshold is directly used as the effective touch standard value to determine the effective touch; in addition, when judging whether the grid at the edge of the touch panel is effective for touch, You can enlarge the sensor value of the grid, or reduce the effective touch standard value to determine the effective touch; in addition, you can judge the effective touch based on the sensor value of the upper, lower, left, and right adjacent grids of the grid with the sensor value greater than the effective touch standard value. Whether the grid is effectively touched.

According to the content of the present invention, after determining the effective touch point in the insulation mode, according to The sensing grid with the sensing value greater than the effective touch standard value, find the area with sensing value greater than a sensing range standard value, and calculate the touch coordinates based on the sensing values of all sensing grids in the area; in addition, you can use enhanced filtering, Methods such as averaging, stabilizing or slowing down processing make the coordinates more stable.

According to the content of the present invention, in the insulation mode, if there is no If any touch event occurs, leave the isolation mode and return to the normal mode.

According to the present invention, in the insulation mode, if there are sensing values in all touch panels If it is greater than a normal sensing standard value, leave the insulation mode; in addition, it may further include that if you leave the insulation mode due to the aforementioned conditions, then when the touch event disappears or the sensing values of all touch cells are less than a restored insulation standard value, no The aforementioned touch judgment condition needs to be executed to directly enter the isolation mode.

According to the content of the present invention, other operation modes are further included, and the touch panel is initially In the normal mode, the insulation mode or other operation modes can be entered respectively according to the insulation judgment condition or the conditions of other operation modes.

According to the content of the present invention, an insulation switch is further included. When the insulation switch is closed, It is restricted to only enter the normal mode or the other operation mode. When the insulation switch is turned on, it can be set to enter the normal mode, the insulation mode or the other operation mode, or it can only enter the normal mode or the insulation mode; In addition, when you can only enter the normal mode or the insulation mode, you can directly use the operation method in the insulation mode to judge the touch effect without executing the insulation judgment condition mentioned above.

According to the content of the present invention, the other operation mode is a waterproof mode, and further includes a Underwater mode. The touch panel is initially in the normal mode. It can enter the insulation mode, the waterproof mode, or the underwater mode according to the insulation judgment condition, a waterproof judgment condition, or an underwater judgment condition respectively; and enter the insulation mode or In the waterproof mode, you can also enter the underwater mode according to the underwater judgment conditions; in addition, when you enter the underwater mode, you can restrict the entry into the waterproof mode when you leave the underwater mode.

The present invention discloses a computing device that includes a central processing unit, a touch panel for allowing users to operate in a touch mode, and a controller that communicates with the touch panel and the central processing unit, or has a The touch sensing value performs the function of judging the touch effect; wherein, the central processing unit and the controller cooperate to perform the operation method as in the present invention.

According to the present invention, it is possible to distinguish a touch panel with a finger, a gloved touch, and a liquid touch panel. Compared with the prior art, the touch effect when the body is attached to the touch panel has a relatively high effective touch recognition ability.

To help understand the spirit and principle of the present invention, the arrangement and sensing method of the capacitive touch panel will be briefly described. Referring to FIG. 1, the touch panel 100 is provided with N columns and M rows of scan lines. In this specification, the area between two adjacent rows and two adjacent columns is called a grid, and the entire touch panel is called a frame. Generally speaking, capacitive touch panels generate an induction electric field on the surface of the panel to obtain the equivalent capacitance value. When a finger touches, the intensity of the induction electric field changes and the equivalent capacitance value also changes. Generally speaking, the magnitude of the change is about pF (10 ^-12 farads), the signal obtained in this way is converted into a digital signal by devices such as analog-to-digital converters, and subjected to other processing to generate corresponding values for use in different processing or calculations. Generally speaking, there are mainly two scanning methods for scanning the touch panel to obtain the sensing value. One is self-capacitive scanning and the other is mutual-capacitive scanning. The present invention mainly uses mutual-capacitive scanning to obtain the sensing value.

Here, the capacitive sensing value of the capacitive touch panel under the sensing electric field is called the original resource. Material, the capacitance sensing value will be different under different environmental conditions such as the touch and attachment of foreign objects. The original data obtained under the initial conditions of not being touched or contacted by foreign objects is referred to as the reference value below. The original value is obtained when the finger touches the capacitive touch panel, and the difference value of the original value minus the reference value is the change value caused by the finger touch, that is, the difference value = the original value-the reference value. For example, FIG. 2A shows the change value of each grid when the finger is touched under normal circumstances, that is, the values shown in the figure are all difference values. As shown in FIG. 2A, the cell with a value of 1197 and its surrounding cells have significantly greater values than other cells, and thus are regarded as finger touches. In the following, the change value will be called the sensing value.

Figure 2B shows the sensing value of each grid when wearing gloves with a thickness of 3mm. Touch with gloves Compared with direct finger touch, the distance between the finger and the touch panel is greater than the thickness of the glove, and the intensity of the induced electric field is inversely proportional to the distance between the sensing objects. Therefore, the sensing value generated when the glove is touched will change The sensing value is smaller than that of direct finger touch. The cell with the largest sensing amount in FIG. 2B has a sensing value of only 138, which is 10 times faster than the maximum sensing value 1197 touched with a finger shown in FIG. 2A. If the sensor value of the finger touch is fixed as the judgment standard, then the sensor value when wearing gloves is too small, and the sensitivity is too low to be distinguished. If the sensor value of the finger touch is fixed as the judgment standard, the sensor value of the finger touch If it is too large and the sensitivity is too high, there will be a situation where the touch response occurs just when the finger is close to the touch panel, or it is easy to be interfered by noise and cause misjudgment. Therefore, the present invention designs two operating modes for the touch panel. The normal mode is when the finger is touched, and the insulation mode is entered when the glove is touched. There will be different touch judgment standards in these two modes to avoid too high or too high sensitivity. Low question.

Figure 3 is a flowchart of the first embodiment to illustrate the decision to enter the insulation according to the present invention Judgment condition of the mode. In the normal mode, the maximum sensing value of finger touch 1197 shown in FIG. 2A is used as a reference standard, and the normal touch threshold value is set to 400 in step S30, and the touch effect of the finger touch can be judged normally. Step S31 is for the case of wearing gloves. The first judgment condition is whether the sensing values of all touch cells are less than the normal touch threshold, which is set to 400 in this embodiment. If the determination in step S31 is negative, the flow proceeds to step S36, and the touch panel remains in the normal mode. Otherwise, the process goes to the next step S32 to execute the second judgment condition, that is, whether there is a touch cell with a sensing value greater than an insulating touch threshold, or after the sensing value is amplified, there is a touch cell with a sensing value greater than the normal touch threshold. In step S32, using the gloved touch maximum sensing value 138 shown in FIG. 2B as a reference standard, the insulated touch threshold is set to 90, as long as the insulated touch threshold is regarded as a valid touch standard value, it can be judged whether There is a situation of wearing gloves to touch the panel. Or first amplify the sensing value by a fixed magnification. In this embodiment, since the maximum sensing value of a gloved touch is only 138, which is 10 times faster than the maximum sensing value of 1197 touched by a finger, the sensing value is first amplified by 10 times, and then the sensing value is amplified. There is a touch grid with a value greater than the normal touch threshold. At this time, the normal touch threshold is the effective touch standard value, and it can also be used to determine whether there is a gloved touch panel. After finding a touch grid with a sensing value greater than the effective touch standard value, it is determined whether the sensing values of the upper, lower, left, and right adjacent grids of the touch grid are all less than the sensing value of the touch grid. If it complies with the above description, it is determined in step S33 that an insulating touch point is formed, otherwise, it proceeds to step S36, and the touch panel remains in the normal mode.

If only the above two conditions are followed, it is directly determined that there is a condition of touching with gloves and then Entering the insulation mode to judge the touch effect is prone to misjudgment. For example, if the finger is still a little away from the touch panel, it will enter the insulation mode when a small change in the inductive value occurs, or it will enter the insulation mode when it is interfered by noise. Therefore, the third judgment condition is added in step S34 to judge whether the following two conditions are met. Condition 1: The insulated touch point continues to exist and the moving distance is greater than a predetermined distance, or Condition 2: The insulated touch point does not move, but disappears within a short period of time and another insulated touch point is judged to appear near the original place, as long as Satisfying one of these conditions means meeting the third judgment condition. In practical applications, these two conditions usually do not occur at the same time. Therefore, it is possible to judge only condition 1 or only condition 2, or both conditions can be judged. As long as one of the conditions is met, the third condition is met. After satisfying the judgment conditions of the first item to the third item, in step S35, the touch panel enters the insulation mode.

In step S34, the third judgment condition mentioned above, in which the effect of setting the predetermined distance Yes: When wearing gloves to touch, you must slide a predetermined distance to confirm the status of wearing gloves to avoid entering the insulation mode due to noise interference. As for the predetermined distance, the calculation does not have to be very accurate, for example, the moving distance is greater than The distance of the 6-cell touch panel can be determined to meet the predetermined distance. As for the description of "the insulated touch point did not move, but disappeared within a short period of time and another insulated touch point is judged to appear near the original place", the description refers to the situation described for two clicks on the original place. Among them, the "short time" can be set to less than 1 second. After touching the touch panel, lifting and pressing within 1 second is regarded as 2 consecutive clicks. As for the description of "near the spot", it can be that the positions of the two clicks are on the same grid, or an error in the distance of the touch grid of 1 or 2 grids is allowed. If the grid is used as the identification standard, at least 1 grid error must be allowed, because if the first click happens to be in the middle of the two grids, if the second click is a little bit off, it will be 1 grid off and cannot be judged.

According to the above-mentioned first embodiment, a judgment condition may be further included, and the execution When the insulation judgment condition is used, it is limited that only one insulated touch point can exist in all touch grids, or the induction value of all touch grids cannot be less than the lower limit threshold. Fig. 4 is a flowchart of the second embodiment integrating the above judgment conditions, so step S44 is added. If in the normal mode, two fingers wear gloves to touch, and two insulation touch points are generated, the insulation judgment condition will not be met, and the insulation mode will not be entered. In addition, if the touch panel is exposed to water or is disturbed by noise and produces a negative sense value, it will not meet the insulation judgment condition, so it will not enter the insulation mode. Instead, go to step S47 to leave the touch panel. In normal mode. As for the value of the lower limit threshold, it can be set according to the characteristics of the touch panel and the size of the noise. For example, the touch panel is interfered by general noise. When there is no contact, the sensor value will vary between plus and minus 20. In this way, the lower limit threshold can be set to minus 40. Under normal conditions, there is a chance to meet the insulation judgment condition. If the minimum inductance is lower than minus 40 under abnormal interference conditions such as water, the insulation judgment will not be met. condition.

According to the above-mentioned second embodiment, "the insulating touch point continues to exist and moves The judgment condition that the moving distance is greater than a predetermined distance" further restricts that the moving track of the insulated touch point is a back and forth movement or a polygonal track. If only the moving distance is used as the judgment condition, when a drop of water slides on the panel, or the user wipes the panel with toilet paper in water, it may also meet the insulation judgment condition and make a misjudgment. Therefore, the movement trajectory of the insulated touch point is further limited to avoid misjudgment. Among them, the description of "moving back and forth" does not need to accurately return to the original touch’s starting point coordinates. For example, continue to observe that the touch coordinates are more than 5 touch grids from the starting point, and then return to a distance less than 2 touch grids from the starting point. It can be regarded as moving back and forth, and the same concept can also be used to determine the movement trajectory of the polygon to avoid misjudgment.

According to the embodiment of the present invention, before the insulation judgment condition is executed, all touch screens The sensor value of the touch panel can be processed as follows: at the beginning of the touch panel, the sensor value of each cell is obtained as the reference value of each cell, and each time the sensor value of each cell is obtained, the sensor value is subtracted from each cell. According to the reference value of the grid, the insulation judgment condition is executed according to the calculated new induction value. For example, the initial reference value of a certain induction grid is 3000, and every time the induction value is taken, 3000 will be deducted for subsequent judgment processing. If the inductance value obtained later is 3100, the new inductance value is 3100-3000 = 100, and the insulation judgment condition is executed according to the calculated new inductance value.

According to the embodiment of the present invention, after subtracting the reference value of each grid from the induction value of each grid, Set a stable interval. When there is no touch event, if the calculated new sensor value is higher than the upper limit of the stable interval, the new sensor value will be subtracted by a compensation value, and the reference value of the grid will be added Above the compensation value, if the calculated new induction value is lower than the lower limit of the stability interval, the new induction value will be added to the compensation value, and the reference value of the grid will be subtracted from the compensation value induction value. As for the upper limit and lower limit of the stable interval, it can be set according to the characteristics of the touch panel and the size of the noise. For example, when the touch panel is not touched and interfered by basic noise, the sensing value is between plus and minus 20. In this way, the upper limit and lower limit of the stable interval can be set to 30 and minus 30, and the compensation value is set to 6. When there is no touch event, if the calculated new sensor value is 35, which is greater than this If the upper limit of the stable interval is 30, the new sensing value will subtract the compensation value of 6, leaving 29, and the reference value of the grid will be added to the compensation value, so that the new sensing value after the reference value is deducted next time It will be 29, keeping the new sensing value within the stable interval.

According to the embodiment of the present invention, when the insulation judgment condition is executed, there is an insulation touch When you click, you can suspend the calculation of adding or subtracting the compensation value. This is because when you touch with a glove, the sensing value is already much smaller than when you touch it with a finger. When the insulation judgment condition is executed, if the calculation of adding or subtracting the compensation value is maintained, the sensing value may be maintained within the stable interval. Even if you wear gloves to touch, the sensing value cannot be greater than the effective touch standard value, and the insulation judgment condition cannot be met, and the insulation mode cannot be entered. Therefore, when performing the insulation judgment condition, when there is an insulation touch point, the calculation of adding or subtracting the compensation value can be suspended, so as to avoid the situation that the insulation judgment condition cannot be met.

According to the embodiment of the present invention, the above-mentioned insulation judgment condition functions as a touch surface When the board is in the normal mode, the basis for judging whether to enter the insulation mode, the following describes the method of judging the touch effect when the touch panel is in the insulation mode. In the insulation mode, you can first amplify the sensing values of all touch cells, and then judge the effective touch based on the normal touch threshold as the effective touch standard value, or directly judge the effective touch based on the insulated touch threshold as the effective touch standard value. control. For example, according to the above data, the sensory value of a finger touch is 10 times the sensory value of a gloved touch. Therefore, in the insulation mode, the sensor value is amplified by 10 times, and then the normal touch threshold 400 mentioned above is used as the effective touch standard value. Determine the effective touch, or directly determine the effective touch based on the aforementioned insulated touch threshold of 90 as the effective touch standard value.

The method for judging the touch effect in the above-mentioned insulation mode, in addition, when judging the touch panel When the edge sensor grid is valid for touch, you can also enlarge the sensor value of the grid, or reduce the effective touch standard value to determine the effective touch. This is to consider the characteristics of the touch panel. The sensing value of the sensing grid at the edge of the panel is usually smaller than the sensing value of the sensing grid at the center of the panel. Therefore, the touch judgment standard is relaxed for the edge of the panel to avoid the inability to respond when wearing gloves to touch the edge of the panel. .

According to an embodiment of the present invention, the above-mentioned method for judging the touch effect in the isolation mode, In addition, it can be determined whether the grid is effectively touched according to the sensing values of the upper, lower, left, and right adjacent grids of the grid whose sensing value is greater than the effective touch standard value. This is to consider that when wearing gloves to touch, there is usually a certain enough contact area, so you can set the judgment standard for the sensing value of the upper, lower, left and right adjacent cells of the cell whose sensing value is greater than the effective touch standard value, for example The sensing value of the adjacent grids must be greater than a certain standard value, or the sum of the sensing values of the neighboring grids must be greater than another standard value to be considered as an effective touch.

According to the embodiment of the present invention, after determining the effective touch point in the insulation mode, according to The sensor grid with the sensing value greater than the effective touch standard value is found to find an area with a sensing value greater than the standard value of a sensing range, and the touch coordinates are calculated according to the sensing values of all the sensing grids in the area. As shown in Figure 5A, in general finger touch conditions, it is sufficient to calculate the touch coordinates by taking the sensing value within the nine-square grid of the touch center; The calculation of the induction value of the nine-square grid is not enough, and there will be many grids close to the maximum value, and the range of the nine-square grid is also easy to be unstable. For example, the maximum induction value in Figure 5B is 138, and the induction value of the right induction grid is 132. If there is noise Changing 132 to 139 will replace 138 as the new maximum value. Take the range of the nine-square grid and move it one grid to the right. The calculation result of the touch coordinate is prone to jitter. Therefore, it is better to draw the sensing range and then calculate the coordinates. For example, find the area with a sensing value greater than 60 (the standard value of the sensing range). In this area, the sensing values of a total of 14 sensing grids are used to calculate the coordinates, and the calculation of touch coordinates The result is relatively stable.

According to the above method of calculating touch coordinates, you can also use enhanced filtering, averaging, Methods such as stabilization or deceleration processing make the coordinates more stable. The filtering can be based on the sensing value of each touch grid, storing the data of the previous sensing values, and filtering the current sensing value, or for the value of the touch coordinate, storing the value of the first few touch coordinates, and the current The value of the touch coordinate is filtered. The average is directly averaged with the values of the previous data, which can be averaged for the sensor value of each touch grid or the value of the touch coordinate. As for the stability processing, please refer to the stable processor of Taiwan Patent Application No. 108117369. The basic principle is that when the value suddenly changes drastically, the concept of reducing the amount of change to stabilize the output value can be based on the sensing value of each touch grid or touch The coordinate values are processed stably. Speed reduction processing is to reduce the reporting rate. For example, in the normal mode, 100 touch coordinates can be calculated and output per second. In the isolation mode, because it is more susceptible to noise interference, it is changed to calculate and output 50 strokes per second. Control coordinates to reduce noise interference.

As described above, when the touch panel of the present invention is in the normal mode, it is judged whether to enter the insulation The method of the mode, and the method of judging the touch effect in the insulation mode. Next, in the insulation mode, a method for judging whether it is necessary to return to the normal mode is described. In the insulation mode, if no touch event occurs within a reserved time, leave the insulation mode. The retention time can be set to 3 seconds, so that in the insulation mode, if you do not touch the touch panel with your fingers or wearing gloves within 3 seconds, it will automatically leave the insulation mode and return to the normal mode.

The touch panel of the present invention is in the insulation mode, if there is a sensor in all the touch panels If the value is greater than a normal induction standard value, leave the insulation mode. Insulation mode is an operation mode designed for the user to wear gloves to touch, so the sensing value is smaller than finger touch, as shown in Figure 5B, the maximum sensing value is only 138, if it is greater than the normal sensing standard value of 400, it will be judged to use The user directly touches the touch panel with a finger, so it will automatically leave the insulation mode and return to the normal mode.

The touch panel of the present invention is in the insulation mode, if the When the sensing value is greater than a normal sensing standard value" and leaving the insulation mode, then when the touch event disappears or the sensing values of all touch cells are less than a restored insulation standard value, the aforementioned touch judgment conditions are not required, and the insulation mode is directly entered . The effect of this design is: when entering the insulation mode, if it returns to the normal mode due to the judgment of the finger touch, it can automatically return to the insulation mode at the moment the finger is lifted. At this time, whether it is a finger or a glove on the touch panel, it can be directly operated . If you do not return to the insulation mode at this time, you must pass the insulation judgment condition every time you wear gloves to enter the glove mode, which is more inconvenient for the user. In addition, it is also possible to set the recovery insulation standard value as the judgment standard. The recovery insulation standard value can be equal to the normal induction standard value of 400, or less than the normal induction standard value, creating a buffer zone to avoid frequent switching between the normal mode and the insulation mode. Switch, but at least greater than the insulation touch threshold of 90.

The aforementioned touch panel includes normal mode and isolation mode, and can also include other operations. In the operation mode, the touch panel is initially in the normal mode, and can enter the insulation mode or other operation modes respectively according to the insulation judgment condition or the conditions of other operation modes. The present invention may further include a waterproof mode, so that the touch panel can switch between normal mode, insulation mode and waterproof mode, as shown in FIG. 6. As for the judgment method of entering and leaving the waterproof mode, and the method of judging the touch effect in the waterproof mode, please refer to the content of Taiwan Patent Application No. 108141417.

The aforementioned touch panel that includes other operation modes, and also includes an insulation switch, when the When the insulation switch is turned off, it is restricted to only enter the normal mode or the other operation mode, and will not enter the insulation mode, so there is no need to perform the aforementioned insulation judgment conditions. When the insulation switch is turned on, it can be set to enter the normal mode, the insulation mode or the waterproof mode, or it can only enter the normal mode or the insulation mode, as shown in Figure 7. This includes three options for users, which are described below. The first selection and use method of the above-mentioned insulation switch is: when the insulation switch remains open, the touch panel remains in a state where it can enter the three modes of normal mode, insulation mode or waterproof mode. The second option for the above-mentioned insulation switch is: when the insulation switch is turned on, the touch panel can enter the three modes of normal mode, insulation mode or waterproof mode. When the insulation switch is turned off, the touch panel can only Enter two modes, normal mode or waterproof mode. The third option for the above-mentioned insulation switch is: when the insulation switch is turned on, the touch panel can only enter the normal mode or the insulation mode. When the insulation switch is turned off, the touch panel can only enter the normal mode. Mode or waterproof mode.

The above-mentioned insulation switch is additionally set when it can only enter normal mode or insulation mode At the same time, it is not necessary to perform the aforementioned insulation judgment condition, and directly use the aforementioned operation method in the insulation mode to judge the touch effect.

The aforementioned touch panel includes other operation modes, and also includes an underwater mode, as shown in Figure 8. Shown. The touch panel is initially in the normal mode, and can enter the insulation mode, the waterproof mode, or the underwater mode according to the insulation judgment condition, a waterproof judgment condition, or an underwater judgment condition, respectively. In addition, when entering the insulation mode or the waterproof mode, you can also enter the underwater mode according to the underwater judgment conditions; in addition, when entering the underwater mode, you can restrict entering the waterproof mode when leaving the underwater mode. For the description of the underwater mode, the underwater judgment conditions, and the judgment method for leaving the underwater mode, please refer to Taiwan Patent Application No. 108141417.

When a device including a processing unit, memory, and touch panel implements the above technology, They can be implemented with firmware, software, or a combination of the two.

FIG. 9 is a block diagram showing a computing device 500 according to an embodiment. As shown in the figure, the meter The computing device 500 includes a touch panel 502, a controller 504, and a central processing unit 506. The touch panel 502 is used for displaying and allowing the user to operate in a touch mode. The controller 504 can obtain an input signal from the touch panel 502, and can perform at least one of the above-mentioned multiple modes according to the present invention in cooperation with the central processing unit 506 according to the input signal. The computing device 500 can execute the waterproof mode processing and/or the insulation mode processing according to the present invention, and has a high touch point accuracy rate.

Although the preferred embodiments of the present invention have been described above, these are merely illustrative It is used and should not be interpreted as limiting the scope of the present invention. Without departing from the spirit of the present invention, those who are accustomed to this skill can perform many modifications. The appended patent scope covers all those falling within the scope of the invention. And changes within the spirit.

500: Computing equipment 502: Touch Panel 504: Controller 506: Central Processing Unit

Figure 1 is a schematic view showing a mutual capacitive touch panel;

Figures 2A and 2B respectively show an example of the sensor values of each cell when a normal finger touches the panel and the sensor values of each cell when the center of the touch panel is touched with gloves;

Fig. 3 is a flowchart for explaining the insulation judgment condition according to the first embodiment of the present invention;

Fig. 4 is a flowchart for explaining the insulation judgment condition according to the second embodiment of the present invention;

5A and 5B respectively show examples of the sensing value sampling range used to calculate the touch coordinates in the normal mode, and the sensing value sampling range used to calculate the touch coordinates in the isolation mode;

FIG. 6 is used to illustrate a state diagram of the touch panel including a normal mode, an insulation mode, and a waterproof mode;

Figure 7 is used to illustrate the state diagram of the touch panel including the normal mode, the insulation mode and the waterproof mode, and the use mode that can be selected when the setting of the insulation switch is also included;

FIG. 8 is used to illustrate a state diagram of the touch panel including a normal mode, an insulation mode, a waterproof mode, and an underwater mode; and

Fig. 9 is a block diagram showing a computing device according to an embodiment.

Claims (12)

A multi-mode operation method for a capacitive touch panel. The touch panel has a plurality of touch grids, and obtains the sensing values of the plurality of touch grids by mutual capacitance scanning, and includes a normal mode and an insulation Mode, and decide whether to enter the insulation mode according to the following insulation judgment conditions: The sensing values in all touch grids are less than a normal touch threshold; There is a touch grid with a sensing value greater than an insulating touch threshold. At this time, the insulating touch threshold is the effective touch standard value, or after the sensing value is amplified, there is a touch grid with a greater than the normal touch threshold. The normal touch threshold is the effective touch standard value, and the sensing values of the upper, lower, left and right adjacent cells of the touch grid are all less than the sensing value of the touch grid. If the above description is met, an insulated touch point is formed ； The insulated touch point continues to exist, and the moving distance is greater than a predetermined distance, or does not move, but disappears within a short period of time and it is determined that another insulated touch point appears near the original place. For example, the method of item 1 in the scope of the patent application further includes that when the insulation judgment condition is executed, only one insulated touch point can exist in all touch grids, or the sensing value of all touch grids cannot be less than the lower limit threshold. . For example, the method of item 1 of the scope of patent application further includes determining whether the moving distance of the insulating touch point is greater than the predetermined distance, and further restricting the moving trajectory of the insulating touch point to move back and forth or be a polygonal trajectory. For example, the method of item 1 in the scope of the patent application further includes the following processing steps for the sensing values of all touch panels before executing the insulation judgment condition: In the initial stage of the panel, the induction value of each grid is obtained as the reference value of each grid; and every time after that, For the induction value of each grid, subtract the induction value from the reference value of each grid, and then execute the insulation judgment condition based on the calculated new induction value; In addition, after subtracting the reference value of each grid from the sensor value of each grid, a stable interval can be set. When there is no touch event, if the calculated new sensor value is higher than the upper limit of the stable interval, then The new sensing value will be subtracted by a compensation value, and the reference value of the grid will be added to the compensation value. If the calculated new sensing value is lower than the lower limit of the stable interval, the new sensing value will be added to the compensation value , And the reference value of the grid will subtract the compensation value induction value; In addition, during the execution of the insulation judgment condition, when there is an insulation touch point, the calculation of adding or subtracting the compensation value can be suspended. For example, in the method of item 1 of the scope of patent application, in the insulation mode, the sensing values of all touch cells are amplified and then the normal touch threshold is used as the effective touch standard value to determine the effective touch, or the insulation touch threshold is directly used as the effective touch threshold. The effective touch standard value judges the effective touch; in addition, when judging whether the grid at the edge of the touch panel is effectively touched, the sensed value of the grid can be enlarged, or the effective touch standard value can be reduced to judge the effective touch; in addition, the effective touch can be judged according to If the sensing value is greater than the sensing value of the upper, lower, left, and right adjacent grids of a grid with a valid touch standard value, it is determined whether the grid is effectively touched. For example, in the method of item 1 in the scope of patent application, after determining the effective touch point in the insulation mode, find out the area where the sensing value is greater than the standard value of a sensing range based on the sensing grid whose sensing value is greater than the effective touch standard value , And calculate the touch coordinates based on the sensing values of all the sensing cells in the area; in addition, you can use methods such as enhanced filtering, averaging, stabilization, or speed reduction to make the coordinates more stable. For example, in the method described in item 1 of the scope of patent application, in the insulation mode, if no touch event occurs within a reserved period of time, leave the insulation mode. For example, in the method described in item 1 of the scope of the patent application, in the insulation mode, if there is an induction value greater than a normal induction standard value in all touch panels, leave the insulation mode; in addition, it can also include if you leave the insulation mode due to the aforementioned conditions In the insulation mode, when the touch event disappears or the sensing values of all touch cells are less than a restored insulation standard value, the touch judgment condition described in item 1 is not required, and the insulation mode is directly entered. For example, the method in item 1 of the scope of the patent application includes other operation modes. The touch panel is initially in the normal mode, and can enter the insulation mode or other operation modes according to the insulation judgment condition or the conditions of other operation modes. For example, the method of item 9 of the scope of patent application includes an insulation switch. When the insulation switch is closed, it can only enter the normal mode or the other operation mode. When the insulation switch is opened, it can be set to enter the normal mode. , The insulation mode or the other operation mode, or the limit can only enter the normal mode or the insulation mode; in addition, when it is set to only enter the normal mode or the insulation mode, the insulation described in item 1 may not be executed For the judgment condition, directly use the method described in item 5 to judge the touch effect. For example, in the method of item 9 of the scope of patent application, the other operation mode is a waterproof mode, and it also includes an underwater mode. The touch panel is initially a normal mode, which can be based on the insulation judgment condition, a waterproof judgment condition, or an underwater mode. Judgment conditions, enter the insulation mode, the waterproof mode or the underwater mode respectively; when entering the insulation mode or the waterproof mode, you can also enter the underwater mode according to the underwater judgment conditions; when entering the underwater mode, you can restrict entry when leaving the underwater mode Waterproof mode. A computing device that includes: A central processing unit; A touch panel for allowing users to operate in a touch mode; and A controller, which communicates with the touch panel and the central processing unit, or has a function of judging the touch effect according to the touch sensing value; Wherein, the central processing unit and the controller work together to execute the method according to any one of items 1 to 11 in the scope of the patent application.

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