JPH1011216A - Touch panel control device - Google Patents

Abstract

(57) [Summary] In a touch panel control device for an electronic device, a ratio at which sample data accompanying a touch input is effective is appropriately set irrespective of a habit of an input operation by a user or an influence of panel characteristics. To do. When a pen input setting screen is displayed on a touch panel liquid crystal display section and a “hard” icon is touched with a pen, a slider is set to “hard” for each touch of the pen.
In addition to moving to the d "side, the X sample error allowable value (XB) and the Y sample error allowable value (YB) are updated and set in a direction in which the allowable values become smaller, so that the sampling accuracy becomes higher. When the "icon 32" is touched with a pen, the slider 33 is moved and displayed to the "soft" side every time the pen is touched, and the allowable values of the X sample error allowable value (XB) and the Y sample error allowable value (YB) are increased. The direction is updated and pen input becomes easier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel control device provided for, for example, a display screen of an electronic device and controlling a touch panel for directly touching the display screen and inputting data.

[0002]

2. Description of the Related Art For example, an information device such as an electronic organizer having a pen input function is provided with a touch panel so as to be superimposed on a display screen. Sampling is performed in correspondence with the Y axis.

[0003] Thus, handwritten data corresponding to the pen touch position on the display screen is input and displayed, and the displayed data is designated or selected. Usually, a touch panel of a resistive film type is used.

In this resistive touch panel, a DC voltage is alternately applied in the X and Y directions between two resistive layers, an upper layer and a lower layer, and an output voltage in the X direction according to a touch position and a Y voltage in the Y direction. The output voltage is derived, and the output voltage in the X direction and the output voltage in the Y direction corresponding to the touch position derived by the touch panel are converted into digital data, and correspond to the X coordinate and the Y coordinate of the display screen area. By sampling as an attached value, when handwritten data is input, the lighting position of the display dot corresponding to the handwritten input position is determined, and when the display data is specified, the display position corresponding to the specified position is displayed. The contents of the data are determined.

Here, in order to increase the accuracy of detecting the touch input position by the touch panel, the coincidence of the touch position data sampled based on the applied voltage in the forward direction and the reverse direction in both the X direction and the Y direction is compared. Is within the preset error tolerance, the sample data is valid.

[0006]

However, as in the above-mentioned conventional touch panel, the match of each sample data based on the applied voltage in both the forward and reverse directions in both the X direction and the Y direction is compared, and the validity of the sample data is compared. For example, if the touch position moves quickly on the touch panel due to handwriting input, or if chattering occurs in the voltage output from the touch panel due to touch input, Since the error between the sample data when the forward voltage is applied and the sample data when the reverse voltage is applied becomes large, there is a problem that most of the sample data becomes invalid unless an allowable value of the error is set large in advance.

On the other hand, if the allowable value of the sample error accompanying the touch input is set to a large value in advance, although most of the sample data becomes effective, the detection accuracy of the input position is reduced, and therefore the input position is largely shifted from the actual touch position. There is a problem that sample data is also valid.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and it is possible to appropriately set a rate at which sample data accompanying a touch input becomes effective irrespective of a user's habit of input operation or an influence of panel characteristics. It is an object of the present invention to provide a touch panel control device that can set the touch panel.

[0009]

That is, a touch panel control device according to a first aspect of the present invention comprises: a touch panel; and input position detecting means for detecting an input position of the touch panel in accordance with a touch input from a plurality of directions. Comparing a plurality of detection values of the touch input position detected by the input position detection means to determine whether the detection value is valid / invalid based on a preset detection error allowable value.
An increase / decrease instruction means for instructing an increase or decrease of the detection error allowable value, and increasing or decreasing the detection error allowable value in accordance with an increase or decrease instruction by the increase / decrease instruction means. And an error allowable value changing means for changing the value.

That is, in the touch panel control device according to the first aspect of the present invention, the detection error allowable value increases or decreases in accordance with the increase or decrease instruction by the increase / decrease instruction means for instructing the increase or decrease of the detection error allowable value. Since it is changed, an arbitrary detection error allowable value can be set.

According to a second aspect of the present invention, there is provided a touch panel control device, comprising: a touch panel; input position detecting means for detecting an input position of the touch panel in accordance with a touch input from a plurality of directions; And a validity / invalidity judging means for judging validity / invalidity of the detection value based on a preset detection error allowable value by comparing a plurality of detection values of the touch input position detected by the method. Valid / invalid frequency counting means for counting the number of times the detection value of the touch input position is determined to be valid and invalid by the valid / invalid determining means, and counting by the valid / invalid number counting means. Error allowable value changing means for changing the detection error allowable value by increasing or decreasing the detection error allowable value in accordance with the ratio between the number of times the detection value is valid and the number of times the detection value is invalid. Characterized in that it was.

That is, in the touch panel control device according to the second aspect, the number of times that the detection value of the touch input position is determined to be valid and the number of times that the detection value of the touch input position is determined to be invalid by the valid / invalid determination means are respectively determined by the valid / invalid number counting means. The detection error allowable value is increased or decreased according to the ratio of the number of valid detection values and the number of invalid detection values counted by the valid / invalid number counting means. Can be automatically corrected to a fixed ratio.

The touch panel control device according to a third aspect of the present invention is the touch panel control device according to the second aspect, wherein the error allowable value changing means is counted by the valid / invalid number counting means. The detection error allowable value is reduced when the ratio of the number of valid detection values is greater than the ratio of the invalid number of detection values, and the detection is performed when the ratio of the number of invalid detection values is greater than the ratio of the valid number of detection values. An error allowable value changing means for changing the error allowable value by increasing the error allowable value is provided.

That is, in the touch panel control device according to the third aspect of the present invention, when the ratio of the number of valid times of the detection value counted by the valid / invalid number counting means is larger than the ratio of the number of invalid times of the detection value, the detection error allowable value is set. If the ratio of the invalid number of detected values is greater than the ratio of the valid number of detected values, the detection error allowable value is increased and changed, so the detection accuracy of the touch input position is too low or the detected value becomes invalid. The ratio at which the detected value of the touch input position is determined to be valid can always be automatically corrected to a constant value.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an external configuration of a pen input type portable information device according to an embodiment of the touch panel control device of the present invention.

The main body 1 of the portable information device is, for example, large enough to be held by the user with one hand.
Is provided.

The touch panel liquid crystal display section 2 of the portable information device main body 1 in FIG. 1 shows a display state of a menu screen 3 on which a plurality of menu icons for selecting and setting an operation mode are arranged.

FIG. 2 is a block diagram showing a configuration of an electronic circuit of the pen-input type portable information device. The electronic circuit of this pen-input type portable information device includes an MPU (microminiature processing unit) 11.

The MPU 11 has a touch panel liquid crystal display 2
In response to sample data corresponding to a touch position input in response to a pen touch operation in the above, a system program stored in the ROM 12 is started in advance to execute operation control of each circuit.
In addition to the OM 12, the RAM 13 is connected, and the liquid crystal display unit 15 in the touch panel liquid crystal display unit 2 is connected via the segment driver 16 and the common driver 17.

The touch panel liquid crystal display section 2 has a transparent touch panel 14 superimposed on the display screen of the liquid crystal display section 15. A voltage signal accompanying a pen touch output from the touch panel 14 is transmitted to a touch panel controller 18. To the MPU 11 via the A / D converter 19 as sample data of the pen touch position.

The ROM 12 and the R
Each of the AM 13 and the control signal line has the address bus 2
0, and are connected via a data bus 11, and both the segment driver 16 and the common driver 17 are connected via a data bus together with their control signal lines.

FIG. 3 is a diagram showing a sampling state of a pen touch position on the touch panel 14 of the pen input type portable information device. FIG. 3A shows sampling in both the forward and reverse directions in the X and Y directions with respect to the pen touch position A. FIG. 7B is a diagram showing a state, and FIG. 7B is a diagram showing a voltage application state to the touch panel 14 at the time of sampling the pen touch position.

FIG. 4 is a circuit diagram showing a configuration of the touch panel controller 18 of the pen input type portable information device.
FIG. 5 is a table showing a switch ON / OFF state in the touch panel controller 18 of the pen input type portable information device in accordance with a sampling procedure of a pen touch position.

That is, the touch panel 14 and the A / D converter 19 are controlled by the touch panel controller 18.
Switching of the switches SW1 to SW11 in FIG.
This is executed by controlling the system according to the switch ON / OFF pattern shown in FIG. The switches SW1 to S in the touch panel controller 18
W11 is actually realized by switching of a transistor.

For example, in the display state of the menu screen 3 in the pen-input type portable information device as shown in FIG. 1, SW1, 3, and 9 correspond to "STATE2" in FIG.
It becomes N and becomes a state of "waiting for pen INT".

Here, when the user selects one of the menu icons by touching with a pen, the PE of the MPU 11 is selected.
The NINT terminal becomes "L" and a pen interrupt occurs. In this way, when the pen interrupt occurs to the MPU 11, the touch panel controller 18 and the A / D converter 19 are controlled in accordance with the pen touch position sampling procedure in FIG. 5 to detect which position of the touch panel liquid crystal display unit 2 has been inputted. , Data corresponding to the pen input position is sampled. Based on the sample data, the menu of the icon selected on the menu screen 3 is recognized, and actual menu processing is started.

The data sample processing accompanying the pen touch is repeatedly performed at a certain fixed cycle until the pen is turned off, that is, it is determined that the pen has left the touch panel 14. And when the pen touch is turned off,
The state returns to the state of "waiting for pen INT".

FIG. 6 shows the RA of the pen input type portable information device.
FIG. 9 is a diagram illustrating a configuration of a register in M13. RAM
13 includes a data register 13a in which various data for detecting a pen input position is stored, a work area 13b in which various data input / output along with the control operation of the MPU 11 are temporarily stored as necessary, A notebook data register 13c for storing memo data, schedule data, address data and the like is provided.

The pen input position detection data register 1
3a, sample values (xf, xr) in the X-axis forward and reverse directions, sample values (yf, yr) in the Y-axis forward and reverse directions sampled from the touch panel 14 via the touch panel controller 18, A / D converter 19
X-axis positive direction backward calculation value (xfber) obtained by subtracting the X-axis positive direction sample value (xf) from the maximum sample value (ADCMAX) of
) “In the drawing,“ − ”is drawn above“ xf ”.”
Maximum sample value of A / D converter 19 (ADCMAX)
Is calculated by subtracting the sample value (yf) in the positive direction of the Y-axis (yfber) from the equation ("-" is drawn above "yf" in the drawing) on the display screen of the liquid crystal display unit 15. The corresponding minimum effective sample value (XA) in the X-axis direction, the minimum effective sample value (YA) in the Y-axis direction corresponding to the display screen of the liquid crystal display unit 15, the X-axis positive direction sample value (xf), and the X-axis reverse direction Error allowable value (XB) of X forward / reverse sample value based on sample value (xr), Y-axis forward direction sample value (yf)
Error allowable value (YB) of the Y forward / reverse sample value based on the Y-axis reverse sample value (yr), the maximum sample value (ADCMAX) obtained by the A / D converter 19, and the minimum value obtained by the A / D converter 19. Sample value (ADCMI
N), an arbitrary fixed count value (α) for determining the X sample error tolerance (XB), and the Y sample error tolerance (YB)
Are stored respectively.

Next, a pen input operation in the pen input type portable information device having the above configuration will be described. FIG. 7 is a flowchart showing a pen sample data acquisition process in the pen input type portable information device.

That is, as shown in FIG. 3, when the point A on the touch panel 14 is touched by a pen, first,
X-axis and Y-axis sampling in the forward and reverse directions are sequentially and continuously performed, and the X-axis forward direction sample value (xf), the X-axis reverse direction sample value (xr), and the Y-axis forward direction sample value (y
f), the Y-axis reverse direction sample value (yr) is obtained, and RA
It is stored in M13 (step S1).

Here, as an example, a procedure for obtaining the X-axis positive direction sample value (xf) will be described. First, all switches SW1 to SW11 of the touch panel controller 18 are turned off corresponding to “STATE0” in FIG.
"Idle state" (terminals XL and X of touch panel 14)
R, YU, and YD are floating).

Next, the switches SW1, SW4, and SW10 are turned on in response to "STATE3", and the X input of the A / D converter 19 is set to "L" for tA (about 50 μs) seconds. The voltage is released (sample preprocessing for preventing the voltage remaining on the touch panel 14 from being an A / D value when the pen input is off).

Next, switches SW1 and SW4 are turned on corresponding to "STATE4", and panel preparation for data sampling is performed. That is, the A / D converter 19 is activated after tB seconds, which is the time when the output voltage of the panel 14 is stabilized by the pen input applied to the X input of the A / D converter 19, and the X-axis positive direction sampling is performed. , The sample value (xf) is obtained and stored in the RAM 13.

Then, the touch panel 14 is returned to the idle state, and then the X-axis reverse direction sample value (x
r), the Y-axis positive direction sample value (yf), and the Y-axis reverse direction sample value (yr) are sequentially acquired by the same processing as described above and stored in the RAM 13.

In this way, the sample values (xf, xr) of the X-axis forward / reverse and the sample values (y / y) of the Y-axis forward / reverse
When (f, yr) is acquired and stored in the RAM 13, it is determined whether or not the pen input is turned off (step S).
2).

The sample data when the pen input is off basically indicates “0” or a value close to “0”.
Since the touch panel 14 is larger than the display screen of the liquid crystal display unit 15, when indicating data outside the range of the display screen,
It is determined that the pen input has been turned off.

That is, the sample values (xf, xr) of the X-axis normal and reverse stored in the RAM 13 are equal to or less than the minimum effective sample value (XA) of the X-axis, or the sample values of the Y-axis normal and reverse, respectively. If (yf, yr) is equal to or less than the minimum effective sample value (YA) on the Y axis, it is determined that the pen input has been turned off (step S2).

If it is determined in step S2 that the pen input has not been turned off, it is determined whether or not the sample values for the X and Y axes are valid (step S3).

That is, each sample value (xf) (yf) in the positive direction of each of the X axis and the Y axis is subtracted from the A / D maximum sample value (ADCMAX), and this is respectively calculated in the X direction inversely calculated value (xfber) and Y value. The X-direction back calculation value (xfber) and the Y-direction back calculation value (yfbe)
r) and sample values (x
r) and (yr) are subtracted and compared. If the difference is within the allowable X-sample error (XB) in the X-axis direction and within the allowable Y-sample error (YB) in the Y-axis direction, the respective sample values are compared. (Xf, xr) (yf, yr) is determined to be valid (step S3).

Here, the X sample error allowable value (XB
) And the Y sample error tolerance (YB) are shown in FIGS.
The user sets an arbitrary allowable value by a pen input setting function described later with reference to FIG.

If it is determined in step S3 that the sample values (xf, xr) of the X-axis forward / reverse and the sample values (yf, yr) of the Y-axis forward / reverse are valid, the process proceeds to step S3. The X-direction back calculated value (xfber) and the Y-direction back calculated value (yfber) obtained by subtraction and comparison with X
The axis reverse direction sample value (xr) and the Y axis reverse direction sample value (yr) are respectively added and averaged, and this is averaged. This is the XY sample data (x,
y) (step S4).

The X sample error allowable value (XB) and Y
As the sample error allowable value (YB) becomes smaller, the conditions under which the sample values of the X-axis and the Y-axis are determined as valid data become stricter. As a result, pen input becomes more difficult. However, if the error tolerances (XB) and (YB) are made extremely small, pen input may not be possible. Therefore, it is necessary to set the minimum value for pen input.

The X sample error allowable value (XB)
As the Y sample error allowable value (YB) increases, the condition under which each sample value on the X-axis and the Y-axis is determined as valid data is relaxed, and consequently pen input easily occurs. In this case, there is a possibility that points gradually separated from the position where the pen is actually touched may be acquired as sample values.In this case as well, the sampling accuracy of pen input is adversely affected. It is necessary to set the maximum value that does not appear.

FIG. 8 is a diagram showing a display state of a pen input setting screen for setting an X sample error allowable value (XB) and a Y sample error allowable value (YB) in the pen input type portable information device.

On the pen input setting screen displayed on the touch panel display section 2 of the portable information device main body 1, "ha"
By touching the “rd” icon 31 with a pen, the “har”
Each time the d ″ icon 31 is touched by the pen, the slider 3
3 is moved and displayed in the "hard" direction, and the X sample error allowable value (XB) and the Y sample error allowable value (Y
The value of B) is reduced, and the state is set so that pen input becomes difficult.

When the "soft" icon 32 is touched with a pen, the slider 33 is moved and displayed in the "soft" direction each time the "soft" icon 32 is touched with a pen, and the X sample error allowable value (XB) and The value of the Y sample error tolerance (YB) is increased, and the state is set so that pen input is easy to enter.

When the "setting end" icon 34 is touched with a pen, the error allowable set value (XB, YB
) Is enabled and stored in the RAM 13, and the pen input setting mode ends.

FIG. 9 is a flowchart showing a pen input setting process for setting an X sample error allowable value (XB) and a Y sample error allowable value (YB) in the pen input type portable information device.

That is, the X sample error allowable value (XB)
When the pen input setting process for setting the Y sample error allowable value (YB) is started, the pen input setting screen (see FIG. 8) is displayed on the touch panel liquid crystal display unit 2 and the pen input wait state is set. When there is a pen input, it is determined whether or not the pen touch position is the display position of the "hard" icon 31 (steps A1 and A2).

In step A2, if it is determined that the value is "N", that is, if it is determined that the pen touch position is other than the display position of the "hard" icon 31, the process proceeds to step A5 and subsequent steps (step A2). → A
5).

On the other hand, in step A2, "Y"
Is determined, that is, the pen touch position is “har
If it is determined that the position is the display position of the d "icon 31, the variable (ADC) variably set between the A / D maximum sample value (ADCMAX) and the A / D minimum sample value (ADCMIN) is: The A / D minimum sample value (ADCMIN
) Is determined (step A2 → A).
3).

Here, when (ADC) = (ADCMIN), since (ADC) does not decrease any more, the processing shifts to the processing after step A5 (step A3 → A).
5). In this case, the slider 33 of the pen input setting screen displayed on the touch panel liquid crystal display unit 2 indicates “har”
It is displayed at the maximum position on the d ″ side.

In step A3, "Y"
Is determined, that is, the variable (ADC) is A /
If it is determined that the value is larger than the D minimum sample value (ADCMIN), the value of the variable (ADC) is decreased by (−1) and updated, and the updated variable (ADC) and XB are updated.
Fixed coefficient value for determination (α), Fixed coefficient value for YB determination (β)
According to the following formulas (1) and (2), the X sample error allowable value (XB) and the Y sample error allowable value (YB
) Are updated and set in the direction in which the permissible value becomes smaller (step A3 → A4).

XB = α × ADC (Equation (1)) YB = β × ADC (Equation (2)) Here, the fixed coefficient value (α) for determining XB and the fixed coefficient value (β) for determining YB are both given. The X sample error allowable value (XB) and Y sample error allowable value (YB), which are arbitrary fixed values and correspond to the value "1" of the variable (ADC), are calculated using the coefficient values (α) and (β). Defined by

Next, in step A5, when it is determined to be "Y", that is, when the pen touch position is "soft"
When it is determined that the position is the display position of the icon 32,
The variable (ADC) is the A / D maximum sample value (A
DCMAX) is determined (step A).
5 → A6).

Here, when (ADC) = (ADCMAX), since (ADC) does not increase any more, the processing shifts to step A8 (step A6 → A8).
In this case, the slider 33 of the pen input setting screen displayed on the touch panel display unit 2 is displayed at the maximum position on the “soft” side.

In step A6, "Y"
Is determined, that is, the variable (ADC) is A /
If it is determined that the value is smaller than the D maximum sample value (ADCMAX), the value of the variable (ADC) is incremented by (+1) and updated, and the updated variable (ADC) and XB are updated.
Fixed coefficient value for determination (α), Fixed coefficient value for YB determination (β)
According to the above equations (1) and (2), the X sample error allowable value (XB) and the Y sample error allowable value (YB
) Are updated and set in the direction in which the permissible values increase (steps A6 → A7).

When the "setting end" icon 34 displayed on the pen input setting screen is touched with the pen, the X sample error allowable value (XB) and the Y sample error allowable value updated and set in step A4 or A7 are set. The value (YB) is stored in the RAM 13, and a series of pen input setting modes is ended (step A8 → setting end).

If the "setting end" icon 34 is not touched by the pen, the process returns to the state of waiting for pen input (step A8 → A1). Therefore, according to the pen input type portable information device having the above configuration, the pen input setting screen is displayed on the touch panel liquid crystal display unit 2 and “hard” is displayed.
When the icon 31 is touched with a pen, the slider 33 is moved to the "hard" side for each touch of the pen, and the X sample error allowable value (XB) and the Y sample error allowable value (YB) become smaller. Is updated and the pen input is difficult to enter, but the sampling accuracy of the pen input position is increased, and “sof
When the "t" icon 32 is touched with a pen, the slider 33 is moved to the "soft" side and displayed for each touch of the pen, and the allowable values of the X sample error (XB) and the Y sample error (YB) are increased. This setting is updated in a certain direction, and the sampling accuracy of the pen input position is lowered.On the other hand, pen input is easy to enter, so the optimal sample error allowable value is set according to the pen input habit of each user and the input characteristics of the touch panel etc. Thus, a sample value associated with pen input can be obtained without excessively lowering sampling accuracy and without making pen input difficult.

In the above embodiment, by touching the "hard" icon 31 or the "soft" icon 32 on the pen input setting screen with the pen, the X sample error allowable value (XB) and the Y sample error allowable value (YB) are set. Although the configuration is changed and set, the slider 33 itself may be moved and displayed by touching with a pen, so that the sample error allowable value may be similarly changed and set.

In the above embodiment, the X sample error allowable value (XB) and the Y sample error allowable value (YB) are
Although the user is allowed to change and set the error tolerance to an arbitrary value through the pen input setting process, in the pen sample data acquisition process in FIG. A configuration may be adopted in which the error tolerance (XB, YB) is automatically corrected and set.

FIG. 10 shows the allowable sample error (XB, YB) associated with pen input in the pen-input type portable information device.
FIG. 4 is a diagram showing a configuration of a register in the RAM 13 when the correction is automatically set.

In this case, the RAM 13 stores various data for detecting the pen input position in the RAM 13 in the same manner as in the above-described embodiment, and various data input and output along with the control operation of the MPU 11. A work area 13b for temporarily storing data as needed, a notebook data register 13c for storing memo data, schedule data, address data, and the like.

The pen input position detection data register 1
3a ', sample values (xf, xr) in the X-axis forward and reverse directions, sample values (yf, yr) in the Y-axis forward and reverse directions sampled from the touch panel 14 via the touch panel controller 18, A / D converter 1
9 minus the sample value (xf) in the X-axis positive direction from the maximum sample value (ADCMAX) of X9.
r) "In the drawing,"-"is drawn above" xf "",
Maximum sample value of A / D converter 19 (ADCMAX)
Is calculated by subtracting the sample value (yf) in the positive direction of the Y-axis (yfber) from the equation ("-" is drawn above "yf" in the drawing) on the display screen of the liquid crystal display unit 15. The corresponding minimum effective sample value (XA) in the X-axis direction, the minimum effective sample value (YA) in the Y-axis direction corresponding to the display screen of the liquid crystal display unit 15, the X-axis positive direction sample value (xf), and the X-axis reverse direction Error allowable value (XB) of X forward / reverse sample value based on sample value (xr), Y-axis forward direction sample value (yf)
Error allowable value (YB) of the Y forward / reverse sample value based on and the Y axis reverse direction sample value (yr), the maximum sample value (ADCMAX) obtained by the A / D converter 19, the number of valid determinations of the pen sample value (valid) ), The number of invalid judgments (invalid), the X-direction sample error allowable range (XB MAX, MIN) including the X-axis sample value error allowable maximum value and the error allowable minimum value, and the Y-direction sample value error allowable maximum value and error allowable value. The sample error allowable range in the Y direction consisting of the minimum value (YB MAX, MIN), the number of valid samples (va
lid) and the maximum number of invalid times (invalid) (DMAX) and the minimum number of times (DMIN), the coefficient value (J) for setting the validity of the pen sample and the coefficient value (K) for setting the invalidity of the pen sample, Sample error tolerance (XB,
An XB correction value (ax) and a YB correction value (ay), which are increase / decrease values associated with one correction for each of YB), are stored.

The maximum permissible error (XB MAX), the minimum permissible error (XBMIN) of the X-direction samples, and the maximum permissible error of the Y-direction samples stored in the pen input position detecting data register 13 a ′ in the RAM 13. Maximum value (YBM
AX), the minimum allowable error value (YBMIN), the validity setting coefficient (J), and the invalidity setting coefficient (K) are appropriate in advance in consideration of the relationship between the sampling accuracy of the pen input position and the ease of pen input. Is set to an appropriate value.

FIG. 11 is a flowchart showing the automatic correction process of the pen sample error allowable value (XB, YB) in the pen input type portable information device. This automatic correction of the pen sample error allowable value (XB, YB) is combined between the step S2 and the step S4 of the pen sample data acquisition processing in FIG.

First, when it is determined in step S2 of the pen sample data acquisition processing in FIG. 7 that the pen input is not turned off, the number of valid samples (v
(A2) or the number of invalid samples (invalid) exceeds the maximum valid / invalid number (DMAX) (step S2 → B1).

In step B1, "Y", that is, the value of the number of valid samples (valid) or the number of invalid samples (invalid) is the maximum valid / invalid number (D
MAX), it is determined that the number of valid samples (valid) and the invalid number of samples (inva
lid) are both cleared to “0” and initialized, and the process proceeds to the validity / invalidity determination process of step S3 (steps B1 → B2, S3).

On the other hand, in step B1, "N",
That is, if it is determined that the value of each of the valid sample count (valid) or the invalid sample count (invalid) is equal to or less than the maximum valid / invalid number (DMAX), the valid sample count (valid) and the invalid sample count (inv) are determined.
valid), the minimum value of valid and invalid numbers (DMIN)
It is determined whether or not this is the case (steps B1 → B3).

If "Y" is determined in step B3, that is, if the values of the valid sample count (valid) and the invalid sample count (invalid) are both equal to or greater than the minimum valid / invalid number (DMIN), the process proceeds to step B3. B4
The processing shifts to the subsequent allowable value correction processing (step B3 → B
4).

That is, the invalid number (invalid) of the sample value accompanying the pen input is the valid number (valid).
Is larger than the value obtained by multiplying the value by the validity setting coefficient (J), and the current sample error allowable value (XB,
YB) is the maximum permissible error (XB MAX, YB
MAX) or less, the permissible sample error value (XB, YB) corresponds to the corresponding correction value (ax, aB).
The value is increased by y), and the correction is set in a direction in which the sample value accompanying the pen input is likely to be valid. At this time, the number of valid samples (valid) and the number of invalid samples (in
valid) are both cleared to “0” and initialized (steps B4 → B5).

On the other hand, when the valid number of times (valid) of the sample value accompanying the pen input is larger than the value obtained by multiplying the invalid number (invalid) by the invalidity setting coefficient (K), Sample error tolerance (XB, YB
) Is the minimum allowable error (XB MIN, YB MIN)
), The sample error tolerance (XB
, YB) are reduced by the corresponding correction values (ax, ay), and the validity of the sample value accompanying the pen input becomes stricter, that is, the sampling accuracy accompanying the pen input becomes higher. Correction is set. At this time, the valid sample count (valid) and the invalid sample count (invalid) are both cleared to “0” and initialized (steps B6 → B7).

As in the validity / invalidity determination process in step S3 in FIG. 7, when the sample value accompanying the pen input is determined to be valid, the sample validity count (v
alid) is incremented by (+1), and the process proceeds to the averaging acquisition processing of the sample values (x, y) in step S4 in FIG. 7 (step S3 → B8, S
4).

As in the validity / invalidity determination processing in step S3 in FIG. 7, when it is determined that the sample value accompanying the pen input is invalid, the sample invalidation count (in
valid) is incremented by (+1) (step S3 → B9).

The X sample error allowable value (XB)
The Y sample error allowable value (YB) has an initial value, and is set to the initial value at the time of reset. Therefore, according to the pen sample error allowable value (XB, YB) automatic correction processing in the pen input type portable information device, statistics of the valid number (valid) and invalid number (invalid) of the pen sample value are obtained, and the validity is calculated. When the number of invalid samples (invalid) increases due to deterioration of the touch panel 14 or the like,
By greatly correcting each sample error allowable value (XB, YB), an invalid pen sample value can be easily made valid, and when the number of valid samples (valid) increases, each sample error can be increased. Allowable value (XB, Y
By correcting B) to a small value, the conditions under which the pen sample value is valid can be strict.

Therefore, the pen sample error allowable value (X
By performing automatic correction of B, YB), the rate at which the sample value is always valid is kept constant even if the pen sample value varies due to the user's habit of the pen input device or the deterioration of the touch panel 14. be able to.

[0078]

As described above, according to the touch panel control apparatus according to the first aspect of the present invention, detection is performed in response to an increase or decrease instruction by the increase / decrease instruction means for instructing an increase or decrease of the detection error allowable value. Since the error allowable value is increased or decreased, an arbitrary detection error allowable value can be set.

According to the touch panel control device of the second aspect of the present invention, the number of times that the detection value of the touch input position is determined to be valid and the number of times that the detection value of the touch input position is determined to be invalid by the valid / invalid determination means are respectively valid / invalid. The detection error allowable value is increased or decreased according to the ratio between the number of valid detection values and the number of invalid detection values counted by the invalid / invalid frequency counting means. This makes it possible to automatically correct the rate at which the detected value of the input position is determined to be valid.

According to the touch panel control device of the third aspect of the present invention, when the ratio of the number of valid times of the detection value counted by the valid / invalid number counting means is larger than the ratio of the number of invalid times of the detection value, a detection error occurs. The permissible value is decreased, and if the ratio of the invalid number of detection values is greater than the ratio of the valid number of detection values, the detection error allowable value is increased and changed. It is possible to automatically correct the rate at which the detected value of the touch input position is determined to be valid without being too invalid.

Thus, according to the present invention, it is possible to appropriately set the ratio at which the sample data associated with the touch input is effective, regardless of the user's input operation habits and the effects of the panel characteristics. .

[Brief description of the drawings]

FIG. 1 is a front view showing an external configuration of a pen input type portable information device according to an embodiment of a touch panel control device of the present invention.

FIG. 2 is a block diagram showing a configuration of an electronic circuit of the pen input type portable information device.

FIG. 3 is a diagram showing a sampling state of a pen touch position on the touch panel of the pen-input type portable information device, and FIG. 3A shows a sampling state of the pen touch position A in both the forward and reverse directions in the X and Y directions; FIG. 4B is a diagram showing a voltage application state to the touch panel at the time of pen touch position sampling.

FIG. 4 is a circuit diagram showing a configuration of a touch panel controller of the pen input type portable information device.

FIG. 5 is a table showing a switch ON / OFF state accompanying a sampling procedure of a pen touch position in the touch panel controller of the pen input type portable information device.

FIG. 6 is a view showing a configuration of a register in a RAM of the pen input type portable information device.

FIG. 7 is a flowchart showing pen sample data acquisition processing in the pen input type portable information device.

FIG. 8 shows an X sample error allowable value (XB) and a Y sample error allowable value (YB) in the pen input type portable information device.
FIG. 6 is a diagram showing a display state of a pen input setting screen for setting the above (1).

FIG. 9 shows an X sample error allowable value (XB) and a Y sample error allowable value (YB) in the pen input type portable information device.
9 is a flowchart showing a pen input setting process for setting ()).

FIG. 10 is a diagram showing a configuration of a register in a RAM when the sample error allowable value (XB, YB) associated with pen input is automatically corrected and set in the pen input type portable information device.

FIG. 11 is a flowchart showing an automatic correction process of a pen sample error allowable value (XB, YB) in the pen input type portable information device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pen input type portable information device main body, 2 ... Touch panel liquid crystal display part, 3 ... Menu screen, 11 ... MPU (microcomputer processing unit), 12 ... ROM, 13 ... RAM, 13a ... Pen input position detection data register , 13b: Work area, 13c: Notebook data register, 14: Touch panel, 15: Liquid crystal display, 16: Segment driver, 17: Common driver, 18: Touch panel controller, 19: A / D converter, 20: Address bus, 21 ... data bus, 31 ... "hard" icon, 32 ... "soft" icon, 33 ... slider, 34 ... "setting completed" icon.

Claims (3)

[Claims] A touch panel; input position detecting means for detecting an input position of the touch panel in response to a touch input from a plurality of directions; and a plurality of detected values of the touch input position detected by the input position detecting means. A touch panel control device comprising: validity / invalidity determining means for determining validity / invalidity of the detection value based on a detection error tolerance value set in advance and instructing an increase or decrease of the detection error tolerance value. A touch panel control device comprising: an increase / decrease instructing unit; and an error allowable value changing unit that changes the detection error allowable value by increasing or decreasing in accordance with an increase or decrease instruction by the increase / decrease instructing unit. 2. A touch panel, input position detecting means for detecting an input position of the touch panel in response to a touch input from a plurality of directions, and a plurality of detected values of the touch input position detected by the input position detecting means. A touch panel control device comprising: validity / invalidity determining means for determining validity / invalidity of the detected value based on a preset detection error allowable value, wherein the validity / invalidity determining means determines the touch input position. Valid / invalid frequency counting means for counting the number of times that the detected value is determined to be valid and the number of times that the detected value is determined to be invalid; A touch panel system comprising: an error allowable value changing unit that changes the detection error allowable value by increasing or decreasing the detection error allowable value in accordance with the ratio. Apparatus. 3. The method according to claim 2, wherein the error allowable value changing means is configured to output the valid / invalid value.
If the ratio of the number of valid detection value counts counted by the invalid number counting means is greater than the ratio of the number of invalid detection values, the detection error allowable value is reduced. 3. The touch panel control device according to claim 2, further comprising an error allowable value changing unit that increases and changes the detection error allowable value when the number is larger than the threshold value.