JP2007122522A - Input device, touch panel input accepting method and operation indicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely detect two-point push in an input device provided with a touch panel. <P>SOLUTION: The input device which is provided with a panel having two conductive films and accepts an input by getting a touch to the panel is provided with a coordinate detection means for detecting coordinates in the panel corresponding to a touch, a coordinate movement distance detection means for detecting the movement distance of the coordinate per unit time, a resistance variable amount detection means for detecting a resistance variable amount by a touch on at least one conductive film, and an input decision part for deciding input contents accepted from a comparison result between the resistance variable amount and a threshold of the variable amount and a comparison result between the coordinate movement distance and a threshold of the movement distance. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an input device including a touch panel (for example, an analog touch panel).

  An input device (analog touch panel type input device) including a touch panel made of two transparent conductive films (resistive films) has an advantage that it can be narrowed at low cost because of its simple configuration. The configuration of this touch panel is shown in FIG. As shown in the figure, the analog touch panel 101 includes a lower conductive film wy and an upper conductive film wx. The upper conductive film wx is provided with electrodes xa and xb at both ends in the X-axis direction. Are provided with electrodes ya and yb at both ends in the Y-axis direction.

  When detecting the x coordinate, as shown in FIG. 4B, a voltage is applied between the electrodes xa and xb of the upper conductive film wx, and the distance from the electrode xa (x coordinate) is applied to the upper conductive film wx. ) Is formed. Here, if the upper conductive film wx and the lower conductive film wy come into contact with each other at the touch position P, the potential at the touch position P of the upper conductive film wx (the partial pressure value by the upper conductive film wx) is passed through the lower conductive film wy. The x coordinate of the touch position is detected from this potential. Note that since the measurement circuit that measures the potential at the touch position P has a sufficiently larger resistance value than each conductive film, the resistance value of the lower conductive film wy does not affect the potential at the touch position P.

  When detecting the Y coordinate, a voltage is applied between the electrodes ya and yb of the lower conductive film wy, and a potential distribution according to the distance (y coordinate) from the electrode ya is formed in the lower conductive film wy. . Here, if the lower conductive film wy and the upper conductive film wx come into contact with each other at the touch position P, the potential at the touch position P of the lower conductive film wy (the partial pressure value by the lower conductive film wy) is passed through the upper conductive film wx. The y coordinate of the touch position is detected from this potential. Also in this case, since the measurement circuit for measuring the potential at the touch position P has a sufficiently larger resistance value than each conductive film, the resistance value of the upper conductive film wx does not affect the potential at the touch position P.

  However, the analog touch panel has a problem that erroneous detection of the touch position occurs when two points are touched at the same time (so-called two-point press). For example, even if P1 and P2 are pressed at the same time and the potential at P1 of the upper conductive film wx is V1, and the potential at P1 of the lower conductive film wy is V2, the analog touch panel performs potential measurement in a state where they are short-circuited. Therefore, the measurement result is (V1 + V2) / 2. That is, it is erroneously detected that the middle point of P1 and P2 is touched (pressed by one point).

  In particular, in a touch panel used as an operation indicator of the target device, such erroneous detection of the touch position is directly connected to an erroneous operation of the target device, so it is necessary to reliably detect a two-point press and invalidate it. For example, in the example of FIG. 5, the switch Q and the switch R are pressed by two points, and the unintended switch Q is turned on. In addition, SW2 is turned on by unintentionally touching SW3 in an attempt to press SW1.

  Conventional methods 1 and 2 can be cited as a method for detecting a two-point press.

  In the conventional configuration 1 (see Patent Document 1), the two-point press intended by the user is detected by monitoring the inter-electrode resistance value of each conductive film (R0 · r0 in FIG. 4A). That is, when P1 and P2 are pressed at two points, the resistances between P1 and P2 are connected in parallel in each conductive film (therefore, the resistance between P1 and P2 is almost halved), and the resistance value between the electrodes Take advantage of the decline.

In the conventional configuration 2 (see Patent Document 2), the movement distance of the touch position per unit time is obtained. Even if the user intentionally presses two points, the two points are unlikely to be pressed completely at the same time, and usually P2 is pressed immediately after pressing P1 (while pressing P1). In this case, the detected touch point moves directly from P1 to the midpoint of P1 and P2, but this moving distance is a value per unit time, and if this is greater than or equal to the threshold value, it is determined that the user intends the two-point press. . If the moving speed is equal to or lower than the threshold value, it is determined that the finger is not touched when the user does not intend to touch.
JP-A-9-34625 (Publication date: February 7, 1997) JP 2000-105645 (release date: April 11, 2000) JP 2000-105645 (release date: April 11, 2000)

  However, the conventional configuration 1 uses the fact that the resistance between P1 and P2 of each conductive film is connected in parallel when P1 and P2 are pressed at two points, so that P1 and P2 are close to each other. There is a problem that it is difficult to detect the point press. This is because, when P1 and P2 are close to each other, the portion to be connected in parallel is shortened, and the decrease in the interelectrode resistance value cannot be detected with high accuracy. In this regard, in Patent Document 1, it is assumed that the user intentionally presses two points (presses the “shift” key and another key on the virtual keyboard), and it is considered that the two points have a constant interval. However, if the user does not intend to do so (due to an erroneous operation), the two points are often close.

  On the other hand, in the conventional configuration 2, since the two-point press is determined based on the movement distance of the touch point per unit time, there is a problem that it is not possible to detect a two-point press that has been pressed (unintentionally) at the same time. .

  The present invention has been made in view of the above problems, and an object thereof is to reliably detect a two-point press in an input device including a touch panel.

  An input device according to the present invention is an input device that includes a panel having two conductive films and receives an input by touching the panel, the coordinate detecting means for detecting coordinates in the panel corresponding to the touch, and the above A coordinate movement distance detection means for detecting a movement distance (movement amount) per unit time of coordinates, and a resistance value change detection means for detecting a resistance value change amount (resistance value change rate) due to a touch in at least one conductive film; And an input determination means for determining input contents received from a comparison result between the resistance value change amount and the change amount threshold value and a comparison result between the coordinate movement distance and the movement distance threshold value.

  According to the above configuration, by comparing the resistance value change amount and the change amount threshold value, two points are touched at a certain distance and at a certain pressure at the same time (that is, the change amount threshold value is exceeded). In this case, it can be determined that the two points are pressed. Further, even when the two touched points are close to each other or pressed at a low pressure and the resistance value change amount does not exceed the change amount threshold value (cannot be determined as two-point press), the coordinate movement distance and the movement distance threshold value described above. This can be determined as a two-point press. Thereby, in an input device provided with a touch panel, it is possible to reliably detect a two-point press unintended by the user.

  In the present input device, it is preferable that the input determination means is an invalid input if the resistance value change amount is equal to or greater than the change amount threshold value. Even if the resistance value change amount is less than the change amount threshold value, it is preferable that the input is invalid if the coordinate movement distance is equal to or greater than the movement distance threshold value. In this way, it is possible to prevent an erroneous touch position from being detected as a single point press due to an unintended two point press.

  Further, the input acceptance method for the touch panel of the present invention is an input acceptance method for a touch panel having two conductive films, a coordinate detection step for detecting coordinates in the panel corresponding to the touch, and a unit time of the coordinates. A coordinate movement distance detection step for detecting the movement distance of the sensor, a resistance value change amount detection step for detecting a resistance value change amount due to a touch in at least one of the conductive films, a comparison result between the resistance value change amount and the change amount threshold value, and And an input determination step of determining input contents received from a comparison result between the coordinate movement distance and the movement distance threshold value.

  The operation indicator of the present invention is characterized in that the target device is controlled (operated) by the input device. Therefore, according to the present operation indicator, it is possible to reliably prevent the target device from being erroneously operated by two-point pressing unintended by the user.

  As described above, according to the input device of the present invention, by comparing the resistance value change amount and the change amount threshold value, two points are simultaneously touched at a certain distance and with a certain pressure (that is, If the change amount threshold value is exceeded), it can be determined that the two points are pressed. Further, even when the two touched points are close to each other or pressed at a low pressure and the resistance value change amount does not exceed the change amount threshold value (cannot be determined as two-point press), the coordinate movement distance and the movement distance threshold value described above. This can be determined as a two-point press. Thereby, in an input device provided with a touch panel, it becomes possible to reliably detect a two-point press unintended by the user. That is, when this input device is used as an operation indicator for operating the target device, it is possible to reliably prevent the target device from being erroneously controlled by two-point pressing unintended by the user.

  An embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 is a block diagram showing the configuration of the input device according to this embodiment. As shown in the figure, the input device 10 includes a touch panel 1, a touch panel interface 4, a control unit 3, and a memory 13.

  FIG. 3A is a schematic diagram showing the configuration of the touch panel. As shown in the figure, the touch panel 1 includes a lower conductive film Wy and an upper conductive film Wx. The upper conductive film Wx is provided with electrodes Xa and Xb at both ends in the x-axis direction. Electrodes Ya and Yb are provided at both ends in the y-axis direction. When the x coordinate is detected, as shown in FIG. 3B, a voltage is applied between the electrodes Xa and Xb of the upper conductive film Wx, and the distance from the electrode (x coordinate) to the upper conductive film Wx. A potential distribution according to is formed. If the upper conductive film Wx and the lower conductive film Wy are in contact with each other at the touch position P, the potential at the touch position P of the upper conductive film Wx (the partial pressure value by the upper conductive film Wx) is passed through the lower conductive film Wy. The x coordinate of the touch position is detected from this potential. Note that the measurement circuit in the touch panel interface 4 that measures the potential at the touch position P has a sufficiently larger resistance value than each conductive film, and therefore the resistance value of the lower conductive film Wy does not affect the potential at the touch position P. . When detecting the y coordinate, a voltage is applied between the electrodes Ya and Yb of the lower conductive film Wy, and a potential distribution corresponding to the distance (y coordinate) from the electrode is formed in the lower conductive film Wy. Here, if the lower conductive film Wy and the upper conductive film Wx come into contact with each other at the touch position P, the potential at the touch position P of the lower conductive film Wy (a partial pressure value by the lower conductive film Wy) is passed through the upper conductive film Wx. The y coordinate of the touch position is detected from this potential. Also in this case, since the measurement circuit in the touch panel interface 4 that measures the potential at the touch position P has a sufficiently larger resistance value than each conductive film, the resistance value of the upper conductive film Wx affects the potential at the touch position P. do not do.

  The touch panel interface 4 is an interface between the touch panel 1 and the control unit 3. For example, a circuit that measures the potential (voltage division value) of each conductive film Wx / Wy or an inter-electrode resistance value of each conductive film Wx / Wy (for example, In the figure, a circuit for measuring R0 · r0) is provided.

The control unit 3 includes a coordinate calculation unit 9, a resistance value change amount calculation unit 8, a coordinate movement distance calculation unit 11, a first determination unit 14,
A second determination unit 15 and a determination processing unit 7 are provided. Here, the coordinate calculation unit 9 detects coordinates in the panel corresponding to the touch in cooperation with the potential measurement circuit of the touch panel interface 4. In addition, the resistance value change amount calculation unit 8 detects the change amount of the interelectrode resistance value in cooperation with the interelectrode resistance measurement circuit of the touch panel interface 4. The memory 13 is used for storing various data used in the control unit 3.

  Below, the function (processing process) of the control part 3 is demonstrated in detail using the flowchart of FIG.

  First, as step 1 (S1), for example, when the power is turned on, the control unit 3 causes the coordinate movement distance threshold d0 (movement distance threshold) and the inter-electrode resistance value change amount (change rate) threshold α (change) in the conductive film Wx. Amount threshold) and the threshold value β (change amount threshold value) of the interelectrode resistance value change amount (change rate) of the conductive film Wy are stored in the memory 13. Next, the resistance value change amount calculation unit 8 is connected via the touch panel interface 4 between the electrodes of the conductive film Wx (between Xa and Xb) R0 and the electrodes of the conductive film Wy (when touch is not performed). The resistance value r0 is acquired and stored in the memory 13 (S2). After S1 and S2, the touch standby state is entered.

  When the touch is performed, the coordinate calculation unit 9 calculates the coordinates (X0, Y0) corresponding to the touch via the touch panel interface 4 and stores them in the memory 13 (S3). Further, the resistance value change amount calculation unit 8 detects the interelectrode resistance value R1 of the conductive film Wx and the interelectrode film resistance value r1 of the conductive film Wy when the touch is performed via the touch panel interface 4. (S4), (R1-R0) / R0 and (r1-r0) / r0 are calculated using this. Further, these are stored in the memory 13.

  Next, the first determination unit 14 compares (R1−R0) / R0 with the threshold value α and compares the (r1−r0) / r0 with the threshold value β (S5). By the way, when the two-point pressing is performed, the resistance is connected in parallel between the two points of each conductive film, and the resistance value between the electrodes decreases. Using this, the first determination unit 14 has been pressed twice if at least one of the interelectrode resistance value variation (R1-R0) / R0 and (r1-r0) / r0 is equal to or greater than the threshold value. And the determination processing unit 7 is notified of this. In response to this, the determination processing unit 7 outputs a touch invalid signal (two-point press prohibiting process, S9).

  If (R1-R0) / R0 and (r1-r0) / r0 are both equal to or smaller than the threshold value in S5, the process proceeds to S6, and the coordinate calculation unit 9 re-coordinates (X1, Y1) again after a predetermined time has elapsed from S3. Are stored in the memory 13 (S7). In response to this, the coordinate movement distance calculation unit 11 obtains the coordinate movement distance d1 from (X0, Y0) and (X1, Y1), and the second determination unit 15 reads the coordinate movement distance d1 from the memory 13. The threshold value d0 is compared (S8).

  By the way, when the two-point press is performed, unlike the case of finger misalignment or the like, the coordinates are instantaneously moved from the first point to the first point and the second middle point. That is, the coordinate movement distance (amount) per unit time becomes very large. In view of this, if the coordinate movement distance d1 is equal to or greater than the threshold value d0, the second determination unit 15 determines that two points have been pressed, and notifies the determination processing unit 7 to that effect. In response to this, the determination processing unit 7 outputs a touch invalid signal (two-point press prohibiting process, S9). On the other hand, if the coordinate movement distance d1 is less than the threshold value d0, it is determined that the point is normally pressed (including normal finger displacement), and the determination processing unit 7 is notified of this. In response to this, the determination processing unit 7 outputs a touch valid signal (S10). Here, when the touch is made, the process returns to S3, and when the touch is not made, the process returns to S2.

  In addition, at least a part of the functions of the respective units of the control unit 3 described above is performed by a processor such as a microcomputer or a CPU.

  As described above, according to the input device 10, the two points are simultaneously touched at a certain distance and with a certain pressure by comparing the amount of change in the resistance value between the electrodes and the threshold value (α · β). In the case (that is, when the threshold value is exceeded), it can be determined that the two-point press. Further, even when the two touched points are close to each other or pressed at a low pressure, the change in inter-electrode resistance value does not exceed the threshold value (cannot be determined as two-point pressing), and the coordinate movement distance and the threshold value (d0). ) Can be determined as a two-point press. Thereby, in an input device provided with a touch panel, it becomes possible to reliably detect a two-point press unintended by the user. That is, when the input device 10 is used as an operation indicator for operating the target device, it is possible to reliably prevent the target device from being erroneously operated due to unintended two-point pressing by the user as shown in FIG. .

  In addition, although the input to the touch panel 1 is normally performed with a user's finger | toe, you may input using a touch pen.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope shown in the claims, and the embodiment can be obtained by appropriately combining technical means disclosed in the embodiment. Is also included in the technical scope of the present invention.

  The touch panel according to the present invention is particularly suitable for an operation indicator that controls a target device.

It is a block diagram which shows the structure of the input device which concerns on this Embodiment. It is a flowchart which shows the function (processing process) of the control part of the input device of FIG. . (A) is a schematic diagram which shows the structure of the touchscreen of the input device of FIG. 1, (b) (c) is a schematic diagram which shows the coordinate (touch position) detection principle in this input device. (A) is a schematic diagram which shows the structure of the conventional input device, (b) (c) is a schematic diagram which shows the coordinate (touch position) detection principle in this input device. It is a schematic diagram which shows the example of 2 point presses which are not intended in a touch panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Touch panel 4 Touch panel interface 7 Judgment processing part 8 Resistance value variation | change_quantity calculation part 9 Coordinate calculation part 10 Input apparatus 11 Coordinate movement distance calculation part 14 1st determination part 15 2nd determination part Wx * Wy electrically conductive film

Claims (5)

An input device comprising a panel having two conductive films and receiving an input by touching the panel,
Coordinate detection means for detecting coordinates in the panel corresponding to the touch;
Coordinate movement distance detecting means for detecting a movement distance per unit time of the coordinates;
Resistance value change amount detecting means for detecting a resistance value change amount due to touch in at least one of the conductive films;
An input determination means for determining input contents received from a comparison result between the resistance value change amount and the change amount threshold value and a comparison result between the coordinate movement distance and the movement distance threshold value;
An input device comprising:   The input device according to claim 1, wherein the input determination unit makes an invalid input when the resistance value variation is equal to or greater than a variation threshold.   3. The input device according to claim 2, wherein the input determination means makes an invalid input if the coordinate movement distance is equal to or greater than the movement distance threshold even if the resistance value variation is less than the variation threshold. An input receiving method for a touch panel having two conductive films,
A coordinate detection process for detecting coordinates in the panel corresponding to the touch;
A coordinate movement distance detection step of detecting a movement distance per unit time of the coordinates;
A resistance value change amount detecting step of detecting a resistance value change amount due to touch in at least one of the conductive films;
An input determination step for determining an input content received from a comparison result between the resistance value change amount and the change amount threshold value and a comparison result between the coordinate movement distance and the movement distance threshold value;
A method for accepting input from a touch panel.   An operation indicator for controlling a target device by the input device according to claim 1.

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