JP2006106844A - Data-capturing control method of touch panel and device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove incorrect data from sampled coordinate data. <P>SOLUTION: Sampling data on the coordinates of a pressed part of a touch panel are captured. The captured sampling data are sorted to discard the data on the both sides. The first average values of the remaining data are computed, and the second average values are computed by averaging the first average values. The second average values are used as the coordinate data of the pressed part of the touch panel. However, when the difference between the first average value of this time and the first average value of previous time is over a prescribed threshold value, the first average value of this time is canceled. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a touch panel data capturing method and apparatus. More particularly, the present invention relates to a method and apparatus for capturing data by preventing erroneous data from being input on a touch panel.

A touch panel is used as a personal interface of a computer system such as a POS system. This touch panel is arranged on a CRT screen or a liquid crystal screen, and when a user guided by the display content on the screen presses the touch panel, an input corresponding to the display content is made.
Here, in the resistive film type touch panel, two resistive films are arranged with a space between them, and when the user presses down one resistive film, it comes into contact with the other resistive film. Thereby, it is possible to determine whether or not the two resistance films are in contact with each other by detecting the electric signal between the two resistance films and detecting the electrical signal, that is, whether or not the touch panel is in a pressed state. it can. Then, after the pressed state is confirmed, data processing for specifying the coordinates of the pressed position is performed.
Please refer to Patent Document 1 as a technology related to this case.
JP-A-6-324787

The touch panel is pressed by the user in various ways, and the touch panel is not always pressed with a constant force. Even if the pressed state is confirmed, the pressed state may become unstable when fetching coordinate data such as chattering. When data processing is performed based on the coordinate data acquired in the unstable state, there is a high possibility that erroneous data that does not indicate coordinates is included in the coordinate data. If such data is included, a phenomenon such as jumping to a point where the coordinates are separated during touch panel input occurs.
As a result of intensive studies to solve the above problems, the present inventors have noticed that there are the following problems in particular when taking in coordinate data using a touch panel.
Since the touch panel easily takes an unstable input state such as chattering, it is preferable to detect whether or not the touch panel is in a pressed state (the upper and lower resistive films are in a contact state) before taking in coordinate data. When the coordinate data is taken in after the detection, it is necessary to switch the switch. Therefore, it is easy to add noise to the data when the switch is on and off. In order to remove data that does not indicate coordinates, it is preferable to discard data that can be determined to be erroneous due to the characteristics of the data.
Furthermore, when processing data from different types of touch panels with a single control unit, the regularity of the error data contained in the sampled coordinate data will be different if the characteristics of the substrate to which the resistive film is applied differ. A treatment that can withstand such various conditions is preferable.

In view of the above problems, the present inventors have developed a method for removing error data suitable for touch panel data acquisition, and corresponded to the present invention.
That is,
A data capture step for capturing sampling data relating to the coordinates of the pressed part on the touch panel;
A first data processing step of sorting the captured sampling data and discarding data at both ends;
A second data processing step for calculating a first average value of the data obtained in the first data processing step;
A third data processing step of further averaging the first average value obtained in the second data processing step to calculate a second average value, the current first average value and the previous time A third data processing step in which the current first average value is canceled when the difference from the first average value exceeds a predetermined threshold;
The touch panel data capturing method, wherein the second average value is used as coordinate data of a pressed portion of the touch panel.

  According to the data capturing method of the present invention, sampling data relating to the coordinates of the pressed portion of the touch panel is processed by three data processing steps, and error data is removed from the sampling data. By performing data processing in this way, error data can be removed with high reliability. Therefore, according to the data acquisition method of the present invention, a highly reliable result can be obtained from the sampled coordinate data.

According to another aspect of the present invention, the method further includes a fourth data processing step of calculating a moving average of the second average value to obtain a third average value,
The third average value is used as the coordinate data of the pressed part of the touch panel.

Since the second average value is obtained by further averaging the first average values, a long time interval is generated between the adjacent second average values. In a touch panel in an unstable input state, the second average value varies due to this time interval and may not be suitable as an input mode of the touch panel. For example, there is a possibility that smooth line segments cannot be drawn when trying to draw line segments on the screen in response to input from the touch panel.
Therefore, the variation is smoothed by moving and averaging the second average value.

The components of the present invention will be described below.
(Touch panel)
The resistive film drive type touch panel targeted by the present invention is roughly divided into a 4-wire resistive film system (hereinafter sometimes abbreviated as “4-wire type”) and a 5-wire resistive film system (hereinafter referred to as “ It may be abbreviated as “5-wire type”). The characteristic of the 4-wire resistive film type is the accuracy of the position accuracy. On the other hand, the characteristic of the 5-wire resistive film type is high durability. Therefore, the user can arbitrarily select the drive method in consideration of the characteristics. An 8-wire resistive film type is also known as one that uses the same operating principle as the 4-wire type. The 8-wire resistive film type is also treated in this specification as equivalent to the 4-wire type.

タッチパネル２４では最初にパネルの押下検出が行われる。そのため、表２の「パネル押下取り込み」のように制御信号線の各端子ＳＷ１〜ＳＷ０に接続されるスイッチユニットを制御し、Int1#の出力がＬｏのときタッチパネルに対する押下があったものとして入力点（図中矢印で示す）の座標検出を行う。 (Operation principle of the 4-wire touch panel 24)
First, the operation principle of the 4-wire touch panel 24 will be described with reference to FIG.
In FIG. 1, each terminal and its function are as shown in Table 1.

On the touch panel 24, the pressing of the panel is first detected. Therefore, the switch unit connected to each terminal SW1 to SW0 of the control signal line is controlled as shown in “Panel Press-Up” in Table 2, and it is assumed that the touch panel has been pressed when the output of Int1 # is Lo. Coordinate detection (indicated by an arrow in the figure) is performed.

上側のタッチパネルは入力点において下側のタッチパネルに接触しているため、ＡＮ０（又はＡＮ１）へ距離Ｘ１に比例した電圧（Ｘ１／Ｘ）×Ｖｃｃが出力される。ここにおいて、Ｘは上側の抵抗膜におけるＸ方向両端に取り付けられた電極間距離である。
同様に入力点のＹ方向座標を検出するには、表２の「Ｙ方向データ取り込み」のように制御信号線の端子ＳＷ１〜ＳＷ０に接続されるスイッチを制御し、検出用端子ＡＮ２又はＡＮ３の出力を解析する。上側のタッチパネルは入力点において下側のタッチパネルに接触しているため、ＡＮ２（又はＡＮ３）へ距離Ｙ１に比例した電圧（Ｙ１／Ｙ）×Ｖｃｃが出力される。ここにおいて、Ｙは上側の抵抗膜におけるＹ方向両端に取り付けられた電極間距離である。 The input point coordinates are detected as follows.
To detect the X-direction coordinates of the input point, the switch unit connected to the control signal line terminals SW1 to SW0 is controlled as shown in “X-direction data capture” in Table 2, and the output of the detection terminal AN0 or AN1 is output. Is analyzed.

Since the upper touch panel is in contact with the lower touch panel at the input point, a voltage (X1 / X) × Vcc proportional to the distance X1 is output to AN0 (or AN1). Here, X is the distance between the electrodes attached to both ends of the upper resistive film in the X direction.
Similarly, in order to detect the Y-direction coordinate of the input point, the switches connected to the control signal line terminals SW1 to SW0 are controlled as shown in “Y-direction data capture” in Table 2, and the detection terminal AN2 or AN3 is controlled. Parse the output. Since the upper touch panel is in contact with the lower touch panel at the input point, a voltage (Y1 / Y) × Vcc proportional to the distance Y1 is output to AN2 (or AN3). Here, Y is the distance between the electrodes attached to both ends of the upper resistive film in the Y direction.

タッチパネル２５では最初にパネルの押下検出が行われる。そのため、表４の「パネル押下取り込み」のように制御信号線の各端子ＳＷ１〜ＳＷ０に接続されるスイッチユニットを制御し、ＡＮ１４及びＩＮＴ０＃の出力を解析してタッチパネルに対する押下判断を行う。押下があったとき、入力点（図中矢印で示す）の座標検出を行う。 (Operation principle of 5-wire touch panel)
Next, the operation principle of the 5-wire resistive touch panel 25 will be described with reference to FIG.
In FIG. 2, each terminal and its function are as shown in Table 3.

On the touch panel 25, a panel pressing detection is first performed. Therefore, the switch unit connected to each of the terminals SW1 to SW0 of the control signal line is controlled as shown in “Panel push-in” in Table 4, and the output of AN14 and INT0 # is analyzed to determine whether to touch the touch panel. When pressed, the coordinates of the input point (indicated by an arrow in the figure) are detected.

上側抵抗膜は入力点において下側抵抗膜に接触しているため、ＡＮ１４へ距離Ｘ１に比例した電圧（Ｘ１／Ｘ）×Ｖｃｃが出力される。ここにおいて、Ｘはフィルム側抵抗膜におけるＸ方向両端に取り付けられた電極間距離である。
同様に入力点のＹ方向座標を検出するには、表４の「Ｙ方向データ取り込み」のようにスイッチを制御し、検出用端子ＡＮ１４へ距離Ｙ１に比例した電圧（Ｙ１／Ｙ）×Ｖｃｃが出力される。ここにおいて、Ｙはフィルム側抵抗膜におけるＹ方向両端に取り付けられた電極間距離である。 The input point coordinates are detected as follows.
In order to detect the X-direction coordinates of the input point, the switch unit connected to each terminal SW1 to SW of the control signal line is controlled as shown in “X-direction data capture” in Table 4 and the output of the terminal AN14 is analyzed. .

Since the upper resistive film is in contact with the lower resistive film at the input point, a voltage (X1 / X) × Vcc proportional to the distance X1 is output to AN14. Here, X is a distance between electrodes attached to both ends in the X direction of the film side resistance film.
Similarly, in order to detect the Y-direction coordinate of the input point, the switch is controlled as in “Y-direction data capture” in Table 4, and the voltage (Y1 / Y) × Vcc proportional to the distance Y1 is applied to the detection terminal AN14. Is output. Here, Y is the distance between the electrodes attached to both ends in the Y direction of the film side resistance film.

The operation principle of the 5-wire touch panel 25 will be described in more detail with reference to FIGS.
As shown in FIG. 3, the 5-wire touch panel is composed of two resistive films, a glass screen, and a film, and the resistive films are attached to the insides of the glass screen and the film, respectively. Spacers with a uniform height are arranged at regular intervals between the glass screen with a resistive film and the resistive film, and are usually arranged so that the two resistive films do not contact each other. In a 5-wire touch panel, the upper resistive film is used as a voltage detection probe, and the lower resistive film is used to generate a partial pressure depending on the pressing point. Here, when the film side of the touch panel is pressed, the two resistance films come into contact with each other.

  FIG. 4 shows a position voltage detection method in the X direction. The resistive film has a uniform resistance value proportional to the distance. Therefore, when P1, P2, P3, and P4 are connected as shown in FIG. 4, current flows from the P1-P4 side to the P2-P3 side. In this state, since a voltage gradient is generated in the lower resistive film, the X-direction position voltage at an arbitrary point on the touch panel can be measured by a voltmeter or a device capable of measuring a voltage value.

  FIG. 5 shows a method of measuring the position voltage in the Y direction. When P1, P2, P3, and P4 are connected as shown in FIG. 5, current flows from the P3-P4 side to the P1-P2 side. In this state, the Y-direction position voltage at an arbitrary point on the touch panel can be measured with a voltmeter or a device capable of measuring a voltage value in the same manner as the X-direction position voltage.

FIG. 6 shows a pressing detection method. When P1, P2, P3, and P4 are connected as shown in FIG. 6, the lower resistance film becomes Lo level. Furthermore, since the upper resistance film is connected to the power supply by a pull-up resistor, it becomes Hi level. In this state, when the upper resistive film is pressed, the upper resistive film changes from the Hi level to the Lo level. Therefore, the pressing can be detected by measuring the voltage value with a voltmeter or a device that can measure the voltage value. I can do it.
As described above, in the 5-wire touch panel, by adjusting the voltage applied to the electrodes P1, P2, P3, and P4, functions equivalent to the opposing X electrode and Y electrode in the 4-wire touch panel are realized. Yes.

Hereinafter, the present invention will be described in more detail with reference to the embodiment of the four-wire touch panel shown in FIG.
An object of the present invention is to obtain highly reliable data. Therefore, in this embodiment, first, the touch panel pressing state is determined with high reliability.
In the 4-wire touch panel, the pressed state is determined in a state where the signal line SW0 # and the signal line SW4 are asserted (a state where the signal is valid, hereinafter referred to as “assert”). That is, when the touch panel is pressed, the X-coordinate resistive film and the Y-coordinate resistive film come into contact with each other, so that the digital signal output terminal INT0 # and the analog signal input terminal AN0 pulled up by the resistor R are both grounded. Leads to a low signal. On the other hand, when the touch panel is not pressed, the X coordinate resistance film and the Y coordinate resistance film are separated from each other, so that a high signal is generated.
The signal output to the input terminal INT0 # for the digital signal is a low-level digital signal when a voltage lower than a certain threshold is input by the gate element, and a voltage higher than the certain threshold is input. In this case, a high level digital signal is output. However, when the gate element is inside the microcontroller, an analog signal may be inputted as it is and converted into a digital signal in the microcontroller.
The analog signal output to the analog signal input terminal AN0 has an output corresponding to the pressing force because the contact resistance between the X coordinate resistance film and the Y coordinate resistance film differs according to the pressing force.

  In the 5-wire touch panel shown in FIG. 2, the pressed state is determined with the signal line SW0 # and the signal line SW2 turned on. Since the analog signal is output to the terminal AN14, the description is omitted because it is the same as that of the four-wire touch panel.

Next, a pressing state determination method using outputs of the digital signal terminal INT0 # and the analog signal terminal AN0 will be described.
FIG. 7 shows the pressed state determination device 1. The pressed state determination device 1 includes a determination unit 2 and an A / D converter 9. The determination unit 2 includes a first pressed state determination unit 3, a second pressed state determination unit 4, and a third pressed state determination unit 5. The A / D converter 9 converts the analog signal SA from the analog signal terminal AN0 into a binary number indicated by the number of bits unique to the A / D converter and allows the third pressed state determination unit 5 to process it.
The determination device 1 is realized by a microcontroller reading a predetermined control program.

Using this pressed state determination device 1, the pressed state is determined by the procedure shown in the flowchart of FIG.
In step 1, it is determined whether or not the digital signal SD input to the digital signal terminal INT0 # is low. When the digital signal SD input to the first pressed state determination unit 3 is low, the first pressed state determination unit 3 is in the contact state between the X coordinate resistance film and the Y coordinate resistance film, that is, the touch panel is in the pressed state. .
When the digital signal SD is high, the touch panel is determined to be in a non-pressed state and returns to a press waiting state.
The determination in step 1 is a pressed state determination interrupt process using a digital signal.

When the pressed state is confirmed in step 1, the digital signal SD is input to the second pressed state determination unit 4 and step 2 is executed. In step 2, the duration of the digital signal SD (low) is measured, and it is determined whether or not the duration corresponds to the next pattern (rule).
(1) The digital signal SD (low) is continued for the first time. In this embodiment, the first time is 2 ms or more.
(2) The digital signal SD (low) is interrupted twice during the second time. In this embodiment, 100 ms is adopted as the second time, and the interruption time is less than 2 ms.
The patterns (1) and (2) are determined in this order. That is, in the pattern (1), it is a requirement that the pressing duration is equal to or longer than the first time (2 ms). Therefore, if the pressing duration is less than the first time (2 ms), the requirement of the pattern (1) Shifts to the determination of pattern (2) as not satisfying. In the pattern (2), a determination time of at least the second time (100 ms) or more is required. Further, the interruption time of the digital signal SD in the pattern (2) is set to be less than the first time (2 ms) in order to avoid confusion with the first time (2 ms).
In step 2, it is determined whether or not the touch panel has been pressed. Although it is possible to make a final determination as to whether or not the touch panel is pressed according to the determination in step 2, in this embodiment, in order to confirm that the touch panel is in a stable pressed state, an analog signal is used to explain below. The pressed state is determined.

When the second pressed state determination unit 4 determines that the duration of the digital signal SD corresponds to the predetermined pattern, the second pressed state determination unit 5 sends a signal to the third pressed state determination unit 5. Is input, and the third pressed state determination unit 5 operates to process the analog signal SA.
The analog signal AS at the terminal AN0 is AD converted by the A / D converter 9 and input to the third pressed state determination unit 5. The third pressed state determination unit 5 determines whether or not the value of the analog signal SA is equal to or less than a preset threshold value (step 3). When it is confirmed in step 3 that the value of the analog signal SA is equal to or less than the threshold value m times (steps 5, 6, and 8), it is determined that the pressed state is stable, and data can be captured ( Step 11). In this embodiment, the continuous number m = 6 is adopted. The continuous number m can be arbitrarily set. In this embodiment, under the control of the S / W controller, the signal line SW0 # and the signal line SW4 are asserted at a predetermined timing to enter the press determination state. In other words, the analog signal SA is input at various predetermined timings. In this embodiment, the time for generating the analog signal SA six times at a predetermined timing is about 10 ms. That is, it is determined whether or not the touch panel is kept pressed during that time. If the analog signal SA is equal to or greater than a preset threshold value (ie, not pressed), retry (n = 24) is executed up to 24 times (steps 7 and 9).

Here, the analog signal SA is targeted as the final determination in order to determine whether the touch panel is pressed or not based on a reference different from the determination based on the digital signal SD. In this embodiment, the depression of the analog signal SA is determined using a voltage value higher than a threshold value for determining whether the digital signal SD is high or low as a threshold value. Since it is possible to make an approximate press determination until step 2, if the determination of the pressed state is performed for a predetermined time with a gentler threshold than this, even if the contact state due to the press is unstable, it is possible to accurately confirm the press / non-press. Because. On the other hand, if the pressed state is determined with the same or higher severity than the case of the digital signal SD, it is determined that the pressed state is not pressed even with a small noise or an extremely short-time half-contact state, and the transition to the data acquisition process is performed smoothly. There is a risk that it will not be broken.
When the non-pressed state is detected by the analog signal SA, the process returns to step 3 without waiting for the pressed state detection immediately, thereby achieving a smooth transition to the data fetching process.
When the touch panel types are different, it is preferable to change the reference (threshold value) for classifying whether the analog signal SA is pressed or not. For example, when a 4-wire touch panel and a 5-wire touch panel are controlled by a single control unit, the reference (threshold value) can be changed according to the type of touch panel connected. It is preferable that the change of the reference (threshold value) is automatically changed when the type of the connected touch panel is specified.

  FIG. 9 shows waveforms of the digital signal SD and the analog signal SA when the touch panel is pressed with a finger. In the chart of FIG. 9, the digital signal SD is represented by the waveform at the bottom. Then, when the digital signal SD falls, it is determined that there is an interrupt signal (step 1), and the pressing determination of step 2 is made. In the case of pressing with a finger, the pressing time continues for a certain time, so that the condition of the pattern (1) is satisfied. As a result, the analog signal SA is fetched and checked for pressing confirmation (step 3). In the example of FIG. 9, since the analog signal SA below the preset threshold value has been captured six times in succession (step 6), data capture is executed (step 11).

  FIG. 10 shows a waveform chart of the digital signal SD and the analog signal SA when the touch panel is pressed with the pen. When the digital signal SD falls, it is determined that there is an interrupt signal (step 1), and the pressing determination in step 2 is made. When the pen is pressed, the duration of the pressing time is short, so the condition of a duration of 2 ms or more is not satisfied. For this reason, the determination of pattern (1) is canceled and the determination of pattern (2) is executed. In the example of FIG. 11, since two interrupt signals are detected, it is determined that the requirement of the pattern (2) is satisfied (step 2). It should be noted that since a time of about 100 ms is preset in the pressing determination of the pattern (2), it is not treated as non-pressing during that time even if the condition of the pattern (1) is not satisfied. After that, an analog signal SA is taken in and checked for confirmation of pressing (step 3). In the example of FIG. 11, since the analog signal SA below the preset threshold value has been captured six times in succession (step 6), data capture is executed (step 11).

  As described above, according to the pressed state determination method of this embodiment, the pressed state is determined using a digital signal, and the stability of the pressed state is confirmed using an analog signal. Therefore, the reliability of the pressed state determination is improved. Therefore, the reliability of the data taken in after being determined to be in the pressed state is improved.

Next, a data capturing method in this embodiment will be described.
FIG. 11 shows a data capturing device 11 of this embodiment.
The data capturing device 1 includes a control unit 13, an AD converter 19, and a data processing unit 20.
The control unit 13 controls each component of the data capturing device 11 according to a predetermined control program. The analog signal of the input terminal AN0, AN0 or AN1, AN2, or AN3 of the 4-wire touch panel shown in FIG. 1 is input to the AD converter 19, and this is converted into a digital signal and input to the data processing unit 20.

The data processing unit 20 includes a pressing determination unit 21, first to fourth data processing units 23 to 26 that process coordinate data in the X direction of the touch panel, and first to fourth data processing that processes coordinate data in the Y direction. The units 33 to 36 are provided.
The pressed state determination unit 21 determines the pressed state of the touch panel based on whether the analog signal SA from AN0 is high or low. The analog signal SA is the same as the analog signal SA in FIG. 7, and the pressed state determination unit 21 also performs the same operation as the third pressed state determination unit 5.

An analog signal SAX representing coordinates in the X direction of the touch panel is an output of the terminal AN0 or AN1 when each switch of the touch panel is set to the “X direction data capture” state shown in Table 2. This analog signal is digitized by an AD converter and input to the first data processing unit 23.
As shown in FIG. 12A, the first data processing unit 23 takes in data in the X direction. In this embodiment, 16 data are taken in 5 ms. Thereafter, this data is sorted in descending order (FIG. 12B), and the four data at both ends are discarded. In the case of the embodiment, 16 data sets are captured five times.

The second data processing unit 24 calculates the average of the central data to obtain the first average value (see FIGS. 12 and 13).
The third data processing unit 25 compares the first average value obtained in this way with the first average value obtained last time. Since the first data has no previous comparison target, it is used as a reference value for comparison, and the data itself is not used. As a result of comparison, if the difference between the two exceeds a predetermined threshold, the first average value is invalidated and the data is cancelled. By repeating this four times, data with small variations can be obtained. The data finally obtained is averaged to obtain a second average value. This second average value is generated every 20 ms.
It should be noted that if no data that is the basis for the second average value is obtained, it is determined that there has been no pressing.

  In the fourth data processing unit 26, a plurality of second average values obtained continuously are used, and a moving average of these is calculated to obtain a third average value. Then, the result is transmitted as data. This is because if the data interval obtained by the fourth data processing unit 26 is set to be larger than 20 ms, if the average value is transmitted as it is, the data transmission interval becomes large, so that the moving distance between each point becomes large. This is in order to avoid that arcs and the like cannot be accurately reproduced. By taking a moving average, it is possible to suppress variations in data and reproduce more natural results.

Data in the Y direction is processed in the same manner as data in the X direction.
That is, the first data processing unit 33 takes in data in the Y direction as shown in FIG. In this embodiment, 16 data are taken in 5 ms. Thereafter, this data is sorted in descending order (FIG. 12B), and the four data at both ends are discarded. In the case of the embodiment, 16 data sets are captured five times.
The second data processing unit 34 calculates the average of the central data to obtain a first average value (see FIGS. 12 and 13).
The third data processing unit 35 compares the first average value obtained in this way with the first average value obtained last time. Since the first data has no previous comparison target, it is used as a reference value for comparison, and the data itself is not used. As a result of comparison, if the difference between the two exceeds a predetermined threshold, the first average value is invalidated and the data is cancelled. By repeating this four times, data with small variations can be obtained. The data finally obtained is averaged to obtain a second average value. This second average value is generated every 20 ms.
It should be noted that if no data that is the basis for the second average value is obtained, it is determined that there has been no pressing.
In the fourth data processing unit 36, a plurality of second average values obtained continuously are used, and a moving average of these is calculated to obtain a third average value. Then, the result is transmitted as data. This is because when the data interval obtained by the fourth data processing unit 36 is set to be larger than 20 ms, if the average value is transmitted as it is, the data transmission interval becomes large, and the moving distance between the respective points becomes large. This is for avoiding that the arc or the like cannot be accurately reproduced. By taking a moving average, it is possible to suppress variations in data and reproduce more natural results.
In this way, stable data can be generated as coordinate data processing of the touch panel by processing the sampling data in a plurality of stages and removing the sampling data according to a predetermined rule.

FIG. 14 shows a series of flow of data acquisition in the embodiment.
The processing of states A-1 to A-3 relating to the pressing determination has been described with reference to FIGS.
FIG. 15 shows details of the state B relating to data acquisition.
In FIG. 15, when the stability of the press determination of state A-3 is confirmed, the process proceeds to state B, and the first press determination B-1 is made. This pressing determination B-1 is performed when the pressing determination unit 21 shown in FIG. 11 determines whether the analog signal from the terminal AN0 is high or low.

Next, X coordinate acquisition B-2 is executed. The X coordinate acquisition has been described with reference to FIGS.
Thereafter, the press determination B-3 is performed again.
Subsequently, Y coordinate capture B-4 is executed. The acquisition of the Y coordinate has been described with reference to FIGS.
The reason why the press determination B-3 is performed between the X coordinate capture B-2 and the Y coordinate capture B-4 is about 1 ms for the X coordinate capture B-2. This is because there is a risk of change. In other words, the reliability of the acquired coordinate data is improved by performing the pressing determination before and after acquiring the coordinate data.

The press determination standby B-5 is provided for adjusting the execution time of the entire routine of FIG.
When pressing determination B-6 is determined that both the first pressing determination B-1 and the next pressing determination B-3 are in the pressed state, the coordinate data is transmitted to the host side of the touch panel system, and the necessary data Provide for processing. However, in the embodiment, the data generated here is not transmitted as it is, but is transmitted after the above-described averaging process.
When it is determined that at least one of the first press determination B-1 and the next press determination B-3 is in the non-press state, the process proceeds to the non-press determination state C without transmitting the coordinate data (see FIG. 15). ).
This sampling process is repeated while the touch panel is pressed.

Next, the non-pressing determination state C is executed when it is determined in the pressing determination B-6 that the button is not pressed.
In the non-pressing determination state C, the pressing determination unit 21 in FIG. 11 operates as follows (see FIG. 16).
In step 21, it is determined whether or not the touch panel is in a pressed state. When the analog signal SA of AN0 is low, that is, when it is determined twice consecutively that the touch panel is in the pressed state, the touched state of the touch panel is stabilized and the process returns to the data capture state B and the routine shown in FIG. 14 is resumed. (Steps 22 and 23).
In this embodiment, the pressed state stability determination criterion is a pressed state that is continuously pressed twice, but this criterion can be arbitrarily set. That is, when the pressed state is confirmed within a predetermined time (third time) after the non-pressed state is detected, the data capture is resumed.

  On the other hand, when the non-pressed state continues for a predetermined number of times, that is, when the non-pressed state continues for a predetermined time (steps 25 and 27), or when the pressed state and the non-pressed state are repeated a predetermined number of times (step 22, 25, 26, 27), it returns to the initial state of waiting for pressing, assuming that the pressed state of the touch panel is released or unstable (see FIG. 14). In this embodiment, the threshold value for the number of continuous non-pressed states (corresponding to the first time) and the threshold value for the number of times the pressed state / non-pressed state is repeated (corresponding to the second time) are both 6 times. However, the number of thresholds can be set arbitrarily. That is, the first time as the threshold value for the duration time of the non-pressed state and the second time value as the threshold value for the repetition time of the non-pressed state and the pressed state can be arbitrarily set.

When the process shifts to the pressing wait state in step 27, the coordinate data is not transmitted and the pressing waits again (see FIG. 15).
Thus, even after the data capture is started, the captured data can be stabilized by determining the pressed state. In addition, as in this embodiment, when the non-pressed state is detected, the state is not immediately shifted to the press waiting state (initial state), but when the pressed state is resumed in a short time, the data capture state is restored. The resumption of import will be made promptly. Therefore, it is possible to improve the reliability of data capture while suppressing as much as possible the degradation in performance of data capture on the touch panel.
Although the description has been made taking the 4-wire touch panel as an example, the data processing method is the same for the 5-wire touch panel.

  The present invention is not limited to the description of the embodiments and examples of the invention described above. Various modifications may be included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.

FIG. 1 shows the driving principle of a 4-wire touch panel. FIG. 2 shows the driving principle of a 5-wire touch panel. FIG. 3 also illustrates the basic configuration of the 5-wire touch panel. FIG. 4 also illustrates X-direction driving of a 5-wire touch panel. FIG. 5 also illustrates Y-direction driving of a 5-wire touch panel. FIG. 6 also illustrates the pressing detection principle of the 5-wire touch panel. FIG. 7 is a block diagram illustrating the configuration of the pressed state determination device according to the embodiment. FIG. 8 is a flowchart for explaining the operation of the pressed state determination apparatus according to the embodiment. FIG. 9 is a chart showing output signals from the touch panel (when pressed by a finger). FIG. 10 is a chart showing output signals from the touch panel (when pressed with a pen). FIG. 11 is a block diagram showing the configuration of the data fetching apparatus of the embodiment. FIG. 12 is a diagram for explaining a first processing step of sampling data. FIG. 13 is a diagram for explaining data processing in the data acquisition device. FIG. 14 is a chart showing a series of data processing in the touch panel of the embodiment. FIG. 15 shows details of the data acquisition state B. FIG. 16 is a flowchart showing the operation of the non-pressing determination state C.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressed state determination apparatus 2 Determination part 3 1st pressed state determination part 4 2nd pressed state determination part 5 3rd pressed state determination part 11 Data acquisition apparatus 13 Control part 20 Data processing part

Claims (5)

A data capture step for capturing sampling data relating to the coordinates of the pressed part on the touch panel;
A first data processing step of sorting the captured sampling data and discarding data at both ends;
A second data processing step for calculating a first average value of the data obtained in the first data processing step;
A third data processing step of further averaging the first average value obtained in the second data processing step to calculate a second average value, the current first average value and the previous time A third data processing step in which the current first average value is canceled when the difference from the first average value exceeds a predetermined threshold;
The touch panel data capturing method, wherein the second average value is used as coordinate data of a pressed portion of the touch panel. A fourth data processing step of calculating a moving average of the second average value to obtain a third average value;
The method according to claim 1, wherein the third average value is used as coordinate data of a pressed portion of the touch panel.   The data acquisition method according to claim 1, wherein the data acquisition step is performed after a touch panel pressing determination is made. The data capturing method according to claim 1 is executed for the coordinate data in the first direction of the touch panel.
After that, the touch panel pressing determination is performed,
Thereafter, the data capturing method according to claim 1 is executed for the coordinate data in the second direction of the touch panel.
A data input method for a touch panel. Data fetching means for fetching sampling data relating to the coordinates of the pressed part on the touch panel;
First data processing means for sorting the captured sampling data and discarding data at both ends;
Second data processing means for calculating a first average value of data obtained by the first data processing means;
Third data processing means for further averaging the first average value obtained by the second data processing means to calculate a second average value, the first average value of this time and the previous time A third data processing means for canceling the first average value this time when the difference from the first average value exceeds a predetermined threshold;
The touch panel data capturing device, wherein the second average value is used as coordinate data of a pressed portion of the touch panel.

Images