JP2016066254A - Electronic device with touch detection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device with a touch detection apparatus, configured to prevent operation error due to an unintended touch error of a user.SOLUTION: An electronic device includes: a touch detection section 112 for detecting a point touched; and a CPU 102 which validates or invalidates the detected points, to determine a user touch operation, on the basis of the valid points out of the detected points. When the touch detection section 112 detects a second point while a first point is detected, the CPU 102 determines whether a distance between the first and second points is equal to or larger than a predetermined value, and invalidates the first or second point when the distance between the first and second points is equal to or larger than the predetermined value. User touch operation can be determined by use of valid touch points, without considering a touch error point, thereby preventing an operation error due to a touch error.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic device including a touch detection device that accepts a touch operation by a user such as a touch panel, and more particularly to a touch detection device that can prevent an erroneous operation caused by accidentally touching a touch surface of the touch detection device. Relates to the electronic device

  In recent years, touch operation devices (touch panels) have been used as user interfaces for operating electronic devices. There are various types of touch panels, such as an infrared blocking method, a capacitance method, a surface acoustic wave method, and a resistive film method. A resistive film type touch panel is adopted for a relatively inexpensive electronic device.

  In a touch panel employing an inexpensive resistive film method, a technique that enables advanced operations has been proposed. For example, Patent Document 1 below discloses a touch panel system that uses a resistive film type touch panel and can execute a plurality of events with a simple configuration and operation. Specifically, a technique for detecting a two-point press on a resistive film touch panel that detects that a midpoint has been pressed by pressing two points is disclosed. In this touch panel system, it is assumed that point A and point B on the panel are pressed with two pens and the two points are clearly separated. At this time, if the user operates “press point A with the first pen → press and release point B with the second pen → release the first pen from point A”, the touch position output is “no → point A → The midpoint C → point A → no point of the points A and B ”. At this time, if the distance between the point A and the middle point C is equal to or greater than a predetermined reference value, it is determined that the point A and the point B are pressed.

  Patent Document 2 below discloses a technique for determining whether a plurality of places are simultaneously pressed or a quick input operation is performed in a video game apparatus employing a resistive film type touch panel.

  Patent Document 3 below discloses a technique for improving collation accuracy by adding not only handwriting on the touch panel but also hand noise to the handwriting information as a technique for managing and collating handwriting for the purpose of personal authentication and the like. Has been. Patent Document 3 separates the trajectory of the pen touching the touch panel into “handwriting intended for writing” and “non-handwriting not intended for writing (hand-held noise, etc.)”. A handwriting management program that records as handwriting information is disclosed. Patent Document 3 also discloses a handwriting management program and a recording display device that collate handwriting and non-handwriting detected on a touch panel with pre-recorded handwriting and non-handwriting. Patent Document 3 exemplifies two methods for separating handwriting and non-handwriting. In the first example, by using a touch panel that detects the contact position of the pen by electromagnetic induction and detects the contact position by the pressure applied to the surface, the point at which both electromagnetic induction and pressure are detected is determined as the handwriting. The point where only the pressure is detected without detecting the electromagnetic induction is determined as non-handwriting (hand-held). In the second example, a capacitive multi-touch sensor is used, and the movement amount of the handwriting is larger than the movement amount of the non-handwriting (with hand). The handwriting and the non-handwriting are separated on the basis of the feature amount.

JP 2003-280816 A Japanese Patent No. 4518919 JP 2013-186698 A

  However, the methods described in Patent Document 1 and Patent Document 2 have a problem that a palm or the like that erroneously touches the operation surface of the touch detection device is also detected as a point B. Hereinafter, erroneously touching the operation surface of the touch detection device is also referred to as erroneous touch.

  In the first example in Patent Document 3, a device for detecting a dedicated pen is indispensable (the configuration of the pen and the panel is restricted), and the user is forced to use the dedicated pen (fingertip). Or the favorite pen of each user cannot be used).

  The second example in Patent Document 3 is suitable for handling handwriting, but it is not always necessary to detect a touch (false contact) that occurs when handling buttons, icons, scroll bars, etc. on a touch panel (touch screen). There is a problem that it is not suitable (it is difficult to discriminate erroneous contact due to the difference in movement amount).

  Therefore, an object of the present invention is to provide an electronic device including a touch detection device that can prevent a touch operation that is not intended by the user, in particular, an erroneous operation due to a touch (erroneous touch).

  An electronic device according to a first aspect of the present invention includes a touch detection unit that detects a point touched by a user, a setting unit that sets a point detected by the touch detection unit as valid or invalid, and a touch detection unit. An operation determination unit that determines a touch operation by the user based on a point that is set effectively by the setting unit among the detected points, and the setting unit detects the first point by the touch detection unit. A distance determination unit that determines whether the distance between the first point and the second point is equal to or greater than a predetermined value in response to detecting the second point in the The setting unit invalidates either the first point or the second point when the distance determination unit determines that the distance between the first point and the second point is equal to or greater than a predetermined value. Set to.

  As a result, it is possible to invalidate a point where the user unintentionally touches the touch detection unit, and the user can perform a touch operation based on a valid point without considering the invalid point. Can be determined.

  Preferably, in a state where the touch detection unit detects the first point and the first point is effectively set by the distance determination unit, the second point is detected by the touch detection unit, and the distance determination is performed. When the unit determines that the distance between the first point and the second point is equal to or greater than the predetermined value, the setting unit sets the second point to be invalid.

  Thereby, when the user touches the touch detection unit unintentionally while the touch point is set to be valid, the point touched later can be set to be invalid.

  More preferably, in a state where the touch detection unit detects a plurality of points including the first point and the plurality of points are effectively set by the distance determination unit, the second point is detected by the touch detection unit. The setting unit sets the second point to be invalid in response to the detection that the distance determination unit determines that the distance between the second point and each of the plurality of points is all equal to or greater than the predetermined value. .

  Thereby, when a user touches the touch detection unit unintentionally in a state where a plurality of touch points are set to be valid, it is possible to set a point touched later to be invalid.

  More preferably, the point detected by the touch detection unit is a point on the touch surface having a predetermined shape. The electronic device further includes a position determination unit that determines whether or not the point detected by the touch detection unit is located in the peripheral portion of the touch surface. In a state where the touch detection unit detects the first point and the first point is effectively set by the distance determination unit, the second point is detected by the touch detection unit, and the distance determination unit When the distance between the first point and the second point is determined to be greater than or equal to the predetermined value, and the position determination unit determines that the first point is located at the peripheral edge of the touch surface, the setting unit Sets the first point to invalid.

  Thereby, when the user touches the touch detection unit without intentionally touching the touch detection unit, such as holding the electronic device, the point touched first can be invalidated.

  Preferably, the point set to invalid by the setting unit is maintained in the invalid state while the point is detected by the touch detection unit.

  Thereby, while the user keeps touching the touch detection unit unintentionally, the erroneous touch point can be prevented from being taken into consideration in the determination of the touch operation by the user.

  More preferably, the electronic device presents a warning in response to the point detected by the touch detection unit being invalidated by the setting unit.

  As a result, the user can know that the touch detection unit has been unintentionally touched, and the erroneous touch can be resolved by separating the erroneously touched portion from the touch detection unit.

  More preferably, the touch detection unit is a resistive film type touch panel, and the touch detection unit receives the fact that the second point is touched while the first point is detected, and the first point is detected. A point and a second midpoint are detected. The electronic device receives the fact that the first point, the middle point, and the first point are sequentially detected by the touch detection unit, and that the first point and the middle point are effectively set by the setting unit. If the distance between the first point and the middle point is a predetermined distance or more, it is determined that the first point and the second point are touched simultaneously.

  Thereby, even in a resistive film type touch panel, erroneous touch points can be invalidated, and two simultaneous touches can be detected based on two valid touch points.

  Preferably, the predetermined value is set for each user.

  Thereby, it is possible to accurately set invalid touch points to invalid for users having different hand sizes.

  More preferably, the electronic device further includes a calculation unit that calculates a predetermined value based on a distance between two points touched by the user, which is detected by the touch detection unit. The predetermined value is calculated by the calculation unit before setting by the setting unit.

  Thereby, an appropriate predetermined value can be set according to the size of the user's hand.

  The electronic device according to the second aspect of the present invention includes a touch surface having a predetermined shape, and detects a point on the touch surface touched by the user, and the point detected by the touch detection unit is valid or A setting unit that is set to be invalid, and an operation determination unit that determines a touch operation by the user based on a point that is set to be valid by the setting unit among the points detected by the touch detection unit. The setting unit receives the fact that the touch detection unit has detected the second point in a state where the first point is being detected, and for each of the first point and the second point, A determination unit that determines whether or not the distance is equal to or greater than a predetermined value. The setting unit invalidates a point where the determination unit determines that the distance to the touch surface is equal to or greater than a predetermined value, and the determination unit does not determine that the distance to the touch surface is equal to or greater than the predetermined value. Set the point to valid.

  As a result, it is possible to invalidate a point where the user unintentionally touches the touch detection unit, and the user can perform a touch operation based on a valid point without considering the invalid point. Can be determined.

  According to the present invention, it is possible to invalidate a point where the user unintentionally touches the touch detection unit, and based on a valid point without considering the invalid point, Touch operation can be determined. For example, when the user touches the touch detection unit with his / her finger unintentionally while touching the touch detection unit with his / her finger, the erroneously touched point can be invalidated. Further, when the user unintentionally touches the touch detection unit when holding the electronic device, the erroneously touched point can be invalidated.

  Even if an inexpensive resistive touch panel is used as the touch detection unit, it is possible to invalidate the point where the user unintentionally touches the touch detection unit. This can be prevented.

It is a block diagram which shows the internal structure of the portable terminal device provided with the touch detection apparatus which concerns on the 1st Embodiment of this invention. It is a front view which shows the portable terminal device shown in FIG. It is a flowchart which shows the control structure of the touch detection program which can be prevented in the portable terminal device shown in FIG. It is a figure which shows the 1st type mistouch. It is a figure which shows the 2nd type mistouch. It is a figure which shows the 3rd type mistouch. It is a flowchart which shows the control structure of the touch detection program which can prevent the erroneous operation by incorrect touch performed in the portable terminal device provided with the touch detection apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the control structure of the touch detection program which can be prevented in the erroneous operation by the erroneous touch performed in the portable terminal device provided with the touch detection apparatus which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the reference value setting process of FIG. It is a figure which shows the portable terminal device with which the message was displayed.

  In the following description and drawings, the same parts are denoted by the same reference numerals. Therefore, detailed description thereof will not be repeated.

(First embodiment)
A mobile terminal device such as a tablet terminal or a smartphone will be described as an example of an electronic device including a touch detection device. Referring to FIG. 1, a portable terminal device 100 including a touch detection device according to a first embodiment of the present invention includes an arithmetic processing unit (hereinafter referred to as CPU) 102, a read-only memory (hereinafter referred to as ROM). ) 104, volatile rewritable memory (hereinafter referred to as RAM) 106, nonvolatile rewritable memory (hereinafter simply referred to as memory) 108, touch panel display 110, display control unit 116, video memory (hereinafter referred to as VRAM) 118, A timer 120 and a bus 122 are provided. The CPU 102 controls the entire mobile terminal device 100.

  The ROM 104 is a non-volatile storage device, and stores programs and data necessary for controlling the operation of the mobile terminal device 100. In the RAM 106, which is a volatile storage device, data is erased when power is cut off. In the memory 108 which is a non-volatile storage device, data is retained even when power is turned off. The memory 108 is, for example, a flash memory or a hard disk drive. The memory 108 may be configured to be detachable. The CPU 102 reads a program from the ROM 104 onto the RAM 106 via the bus 122 and executes the program using a part of the RAM 106 as a work area. CPU102 controls each part which comprises the portable terminal device 100 according to the program stored in ROM104.

  The touch panel display 110 includes a touch detection unit 112 and a display unit 114. The touch detection unit 112 is a touch panel, for example, and detects a touch operation by the user. The touch detection unit 112 is arranged so as to be superimposed on the display screen of the display unit 114. Therefore, the touch on the touch detection unit 112 is an operation of designating a point of the image displayed on the display screen corresponding to the touch position.

  The display unit 114 is a display panel (liquid crystal panel or the like) for displaying an image. The display control unit 116 includes a drive unit for driving the display unit 114, reads out image data stored in the VRAM 118 at a predetermined timing, generates a signal for display as an image on the display unit 114, and displays it. Output to the unit 114. The displayed image data is read from the memory 108 by the CPU 102 and transmitted to the VRAM 118.

  The timer 120 executes time measurement processing, and receives information from the CPU 102 and transmits information indicating the current time (hereinafter also simply referred to as the current time) to the CPU 102.

  The CPU 102, ROM 104, RAM 106, memory 108, touch detection unit 112, display control unit 116, VRAM 118, and timer 120 are connected to the bus 122. Data (including control information) is exchanged between the units via the bus 122.

  The mobile terminal device 100 may include a communication unit. The mobile terminal device 100 can transmit and receive data to and from a computer or the like connected to a network via a communication unit. The communication unit performs communication using a known wireless communication method such as Wi-Fi or Bluetooth (registered trademark).

  FIG. 2 shows the touch detection unit 112 (touch panel). There are various types of touch panels such as an infrared blocking method, a capacitance method, a surface acoustic wave method, and a resistive film method, but any type of touch panel may be used. The touch detection unit 112 outputs the position coordinates of the touched point with reference to the position coordinates set in advance with respect to the touch surface. In FIG. 2, with the upper left of the touch surface as the origin, the right direction is set as the positive direction of the X axis and the lower direction is set as the positive direction of the Y axis, and the coordinates (x, y) of the touched point 200 are output. Since the method for detecting the touched position is known according to the touch panel system, the description thereof will not be repeated.

  With reference to FIG. 3, a touch detection program that is executed in the mobile terminal device 100 and can prevent an erroneous operation due to an erroneous touch by the user will be described. This program is started when the power of the mobile terminal device 100 is turned on.

  In step 300, the CPU 102 performs initial setting. Specifically, the CPU 102 secures an area for storing the valid list and the invalid list on the RAM 106 and sets an initial value (for example, “0”). Further, the CPU 102 acquires the current time from the timer 120 and stores it in the RAM 106. In the effective list, information on contact points handled as effective contact points among the touched points is stored. In the invalid list, information on contact points handled as invalid contact points among the touched points is stored. For example, the valid list stores information as many as the number of contact points, with specific information for specifying contact points, position coordinates (x, y), and attribute information as one set. The same applies to the invalid list. The attribute information is information other than the position information of the contact point, and includes information such as a velocity vector, for example.

  In step 302, the CPU 102 acquires position information (coordinate data) of a point (contact point) currently touching the touch surface of the touch detection unit from the touch detection unit, and stores it in a predetermined area of the RAM 106. Further, the CPU 102 acquires the current time from the timer 120 and stores it in the RAM 106.

  As will be described later, since step 302 is repeatedly executed, an area different from the area for storing the previously detected contact point is used in the RAM 106 as the area for storing the currently detected contact point. Specifically, the information of the contact point detected last time is stored in the valid list and invalid list. As for the current time, the previous time and the current time are stored.

  In step 304, the CPU 102 determines the contact point acquired in step 302 (the contact point detected this time) and the contact point currently stored in the valid list and invalid list in the RAM 106 (contact point detected last time). Perform the association. A known method may be used for associating each point. For example, two points at the shortest distance can be associated as the same point under the restriction that the mutual distance is a predetermined value or less.

  In step 306, the CPU 102 updates the position coordinates with the position coordinates detected in step 302 for the contact points associated in step 304 out of the contact point information included in the valid list and invalid list. Further, the attribute information is updated. For example, if the attribute information is a velocity vector, the CPU 102 calculates the elapsed time (Δt) by subtracting the previous time from the current time stored in the RAM 106, and determines the contact point associated in step 304. The displacement amount (Δx, Δy) of the position is divided by the elapsed time, and the velocity vector is updated with the obtained values (Δx / Δt, Δy / Δt).

  In step 308, the CPU 102 determines whether or not a contact point that has not been associated in step 306 (hereinafter referred to as a non-corresponding point) exists in the valid list. If it is determined that there is a non-corresponding point, control proceeds to step 310. Otherwise control passes to step 312.

  In step 310, the CPU 102 deletes information on the non-corresponding points (specific information, position coordinates, and attribute information) from the valid list.

  In step 312, the CPU 102 determines whether there is a contact point that is not associated in step 306 in the invalid list. If it is determined that there is a non-corresponding point, control proceeds to step 314. Otherwise control passes to step 316.

  In step 314, the CPU 102 deletes information on the non-corresponding point (specific information, position coordinates, and attribute information) from the invalid list.

  In step 316, the CPU 102 determines whether or not the contact point detected in step 302 includes a new contact point. Specifically, the CPU 102 determines whether there is a point that could not be associated in step 304 among the points whose position coordinates were acquired in step 302. When there is a non-corresponding point, it is determined that there is a new contact point, and when there is no non-corresponding point, it is determined that there is no new contact point. If there is a new contact point, control passes to step 318. Otherwise control passes to step 332.

  In step 318, the CPU 102 determines whether or not the valid list is empty (that is, information on contact points is not included). If it is determined to be empty, control proceeds to step 330. Otherwise (if the valid list contains at least one set of contact point information), control passes to step 320.

  In step 320, the CPU 102 calculates the distance between the contact point determined as a new point in step 316 and each contact point in the valid list, and calculates the shortest distance d1.

  In step 322, the CPU 102 determines whether or not the shortest distance d1 calculated in step 320 is greater than a predetermined value d0. The predetermined value d0 is about 10 cm, for example. With this setting, when a touch operation is performed with the index finger, for example, when the thumb ball, the little finger ball, or the wrist touches the touch surface, the touch may be erroneously touched as described later. it can.

  If d1> d0, control proceeds to step 324. Otherwise (d1 ≦ d0), control proceeds to step 330. The processing in step 322 is processing for determining whether or not a new contact point should be validated. If the determination result is NO, the new contact point is validated (see step 330), as will be described later.

  In step 324, the CPU 102 determines whether or not the contact point in the valid list satisfies a predetermined condition. Specifically, the CPU 102 determines that the contact point in the valid list is located on the peripheral portion of the touch surface of the touch detection unit 112 (within a predetermined distance from any one of the four sides) and on the display unit 114. It is determined whether or not it is located outside an operable element (such as a button) on the displayed screen. This is a process for determining whether or not the contact point in the valid list should be invalidated. If the contact point that satisfies the condition is in the valid list, control passes to step 326. If the contact point that satisfies the condition is not in the valid list, control passes to step 328.

  In step 326, the CPU 102 moves the information on the contact points in the valid list determined to satisfy the predetermined condition in step 324 to the invalid list. That is, some or all of the contact points detected before a new contact point is detected are invalidated. Thereafter, control proceeds to step 330.

  In step 328, the CPU 102 adds new contact point information to the invalid list. At this time, the initial value is stored in the attribute information. For example, (0, 0) is stored as the velocity vector. Thereafter, control proceeds to step 332.

  In step 330, the CPU 102 adds new contact point information to the valid list. At this time, the initial value is stored in the attribute information.

  In step 332, the CPU 102 determines an operation according to the information on the contact point in the valid list, and executes the corresponding process. Thereafter, control returns to step 302.

  For example, if the position coordinates of the contact point in the valid list are located on a button on the screen displayed on the display unit 114 and the speed is less than a predetermined value (the speed is almost zero), the button The selection operation is determined. For example, if the number of contact points in the valid list is one and the speed is equal to or higher than a predetermined value (high speed), the flick operation in the direction indicated by the speed vector is determined. For example, if there is one contact point in the valid list and the speed is within a predetermined range (medium speed), it is determined that the drag operation is in the direction indicated by the speed vector. For example, if there are two contact points in the valid list and each velocity vector is in the opposite direction, the pinch operation is determined. If the velocity vector of one point in the pinch operation is in the direction toward the other point, it is determined as a pinch-in operation (an operation to narrow the distance of the touched finger). If the velocity vector at one point is away from the other point, it is determined as a pinch-out operation (an operation to increase the distance of the touched finger). And the process according to the touch operation determined in this way is performed.

  Steps 302 to 332 are repeated until the power of the mobile terminal device 100 is turned off. When the power is turned off, the program ends.

  Hereinafter, it will be described with a specific example that an erroneous touch by a user can be detected by the above-described program and an erroneous operation caused by the user can be prevented.

  Referring to FIG. 4, after touching touch detection unit 112 with a finger (touching point 402), user 400 erroneously touches with a palm or the like while maintaining the touch (touching point 406). At this time, the erroneous touch may occur in a state where the point 402 touched first is not moving or in a state where the point 402 is moved. Hereinafter, such an erroneous touch is referred to as a first type erroneous touch. In FIG. 4, the user 400 when touching the point 402 is indicated by a broken line.

  When the point 402 is first touched, the position coordinates are detected in step 302. At that time, since the valid list and the invalid list are empty, the determination results in step 308 and step 312 are NO, the determination results in step 316 and step 318 are YES, and in step 330, the information at point 402 is changed to the valid list. Added. Thus, in step 332, if a process corresponding to the touch of the point 402 that is valid is determined, the process is executed. For example, if the point 402 is on a button, the process assigned to that button is executed.

  Subsequently, when the point 406 is touched in a state where the touch is maintained (a state where only the information of the point 402 is included in the valid list), in step 302, the point 404 (the point where the point 402 has moved) and the point 406 are displayed. The position coordinates are detected. In step 304 and step 306, the point 404 is associated with the previous contact point (point 402) and the information is updated, but the point 406 is not associated. At this time, only the information of point 404 is included in the valid list, and the determination result of step 308 is NO. The invalid list is empty, and the determination result in step 312 is also NO. Thereafter, the determination result of step 316 is YES, step 318 is executed, the determination result is NO, and step 320 is executed.

  In step 320, the distance d1 between the points 404 and 406 is calculated, the determination result in step 322 is YES, and step 324 is executed. Since the point 404 in the valid list is not located at the periphery of the touch surface, the determination result in step 324 is NO, and step 328 is executed, and the information on the point 406 is added to the invalid list. As a result, in step 332, a touch operation is determined based only on the information of the valid point 404, and if a corresponding process is determined, it is executed.

  In this way, when the first type of erroneous touch occurs, the erroneously touched point (point 406) is invalidated, so that the touch operation by the user can be performed based on the information of only the valid point (point 404). It is possible to determine the touch operation, and the touched point is not considered. Therefore, erroneous operation can be prevented.

  Further, even if the user 400 further moves the touch position (point 404) and the erroneous touch point (point 406) moves while maintaining the erroneous touch, the erroneous touch point detected by the movement is Corresponding at 304 and updated while being maintained in the invalid list. Therefore, once it is recognized as an erroneous touch and the erroneous touch is maintained, an erroneous operation due to the erroneous touch point does not occur. Contact points once added to the invalid list are maintained in the invalid list. Therefore, even if the user touches the touch detection unit 112 after touching it erroneously and then touches with the finger again, the touch point is maintained in the invalid list, which affects the determination of the touch operation of the user. There is no.

  Referring to FIG. 5, after touching touch detection unit 112 with two fingers (touching points 410 and 412), user 400 erroneously touches with a palm or the like while maintaining the touch (see FIG. 5). Touch point 418). At this time, the erroneous touch is a state in which the two points 410 and 412 touched first do not move even when the two points 410 and 412 touched first move to points 414 and 416, respectively. But it can happen. Hereinafter, this type of erroneous touch is referred to as a second type of erroneous touch. In FIG. 5, the user 400 when the point 410 and the point 412 are touched is indicated by a broken line.

  In this case, when the two points 410 and 412 are first touched, their position coordinates are detected in step 302. At this time, since the valid list and invalid list are empty, the determination results in step 308 and step 312 are NO, the determination results in step 316 and step 318 are YES, and in step 330, the information of points 410 and 412 is displayed. Added to the valid list. Thus, in step 332, if a process corresponding to the touch of the points 410 and 412 that are valid is determined, the process is executed.

  Subsequently, when the point 418 is touched in a state where the touch is maintained (a state where the information of the points 410 and 412 is included in the valid list), in step 302, the points 414 and 416 (points 410 and 412). ) And the position coordinates of the point 418 are detected. In step 304 and step 306, the point 414 and the point 416 are associated with the previously detected contact points (the point 410 and the point 412) and the information is updated, but the point 418 is not associated. . At this time, the information of the points 414 and 416 is included in the valid list, and the determination result of step 308 is NO. The invalid list is empty, and the determination result in step 312 is also NO. The determination result in step 316 is YES, step 318 is executed, the determination result is NO, and step 320 is executed.

  In step 320, the distance between the point 418 and the points 414 and 416 is calculated, the shortest distance d1 is determined among these distances, the determination result in step 322 is YES, and step 324 is executed. Since the point 414 and the point 416 in the valid list are not located at the peripheral edge of the touch surface of the touch detection unit 112, the determination result in step 324 is NO, step 328 is executed, and the information of the point 418 is invalid. Added to the list. Thereby, in step 332, the touch operation is determined based only on the information of the valid points 414 and 416, and if a process corresponding to the touch operation is determined, it is executed.

  In this way, even when the second type of erroneous touch occurs, the erroneously touched point (point 418) is invalidated, so that only information on valid points (point 414 and point 416) The touch operation by the user can be determined, and the erroneous touch point is not considered in determining the touch operation. Therefore, erroneous operation can be prevented.

  Further, even if the user 400 further moves the touch position (point 414 and point 416) and the erroneous touch point (point 418) moves while maintaining the erroneous touch, the first type of erroneous touch is detected. Similarly, erroneous touch points detected by movement are updated while being maintained in the invalid list. Therefore, once it is recognized as an erroneous touch and the erroneous touch is maintained, an erroneous operation due to the erroneous touch point does not occur.

  In addition, although FIG. 5 demonstrated the case where 2 points | pieces were touched simultaneously, even if 3 or more points | pieces were touched simultaneously, the point touched erroneously is invalidated similarly.

  Referring to FIG. 6, when user 400 grips portable terminal device 100 with one hand, user 400 erroneously touches touch detection unit 112 (touches point 420). While the erroneous touch is maintained, the user 400 performs an operation by touching the touch detection unit 112 with a finger (touching the point 422). Hereinafter, such an erroneous touch is referred to as a third type of erroneous touch.

  In this case, when the point 420 is first touched, the position coordinates are detected in step 302. Since the valid list and the invalid list are empty, the determination result of step 308 and step 312 is NO, the determination result of step 316 and step 318 is YES, and in step 330, information on point 420 is added to the valid list. Accordingly, in step 332, if a process corresponding to the touch of the point 420 that is valid is determined, the process is executed. Here, it is assumed that the erroneously touched point 420 is located outside an operable element (such as a button), and the process is not executed.

  Subsequently, when the point 424 is touched in a state in which the touch is maintained (a state in which only the information of the point 420 is included in the valid list), in step 302, the point 422 (moved from the point 420 due to a change in the gripping state) And the position coordinates of the point 424 are detected. Through steps 304 and 306, the point 422 is associated with the previous contact point (point 420) and the information is updated, but the point 424 is not associated. At this time, only the information of the point 422 is included in the valid list, and the determination result of step 308 is NO. The invalid list is empty, and the determination result in step 312 is also NO. The determination result in step 316 is YES, step 318 is executed, the determination result is NO, and step 320 is executed.

  In step 320, the distance d1 between the point 422 and the point 424 is calculated, the determination result in step 322 is YES, and step 324 is executed. Since the point 424 in the valid list is located at the periphery of the touch surface of the touch detection unit 112 and outside the operable element on the screen displayed on the display unit 114, the determination result of step 324 is YES, step 326 is executed, and the information at point 422 is added to the invalid list. Thereafter, step 330 adds point 424 to the valid list. Thereby, in step 332, the touch operation is determined based only on the information of the valid point 424, and if a corresponding process is determined, it is executed.

  In this way, when the third type of erroneous touch occurs, the erroneously touched point (point 422) is invalidated, so that the touch operation by the user can be performed based on the information of only the valid point (point 424). It is possible to determine the touch operation, and the erroneous touch point is not considered in determining the touch operation. Therefore, erroneous operation can be prevented.

  Further, even when the user 400 further moves the touch position (point 424) and the erroneous touch point (point 422) moves while the erroneous touch is maintained, as in the first and second types of erroneous touches, The erroneous touch point detected by the movement is updated while being maintained in the invalid list. Therefore, once it is recognized as an erroneous touch and the erroneous touch is maintained, an erroneous operation due to the erroneous touch point does not occur.

  The program shown in FIG. 3 can be executed with various modifications. For example, in the above description, the case where the shortest distance d1 between the new contact point and the contact point in the valid list is calculated as the value used in the determination in step 322 in step 320 has been described, but the present invention is not limited to this. . For example, the average value of the X coordinate and the average value of the Y coordinate are calculated for a plurality of contact points in the valid list, and the distance between the point (center of gravity) having these as the X coordinate and the Y coordinate and the new contact point is calculated. May be. The calculated distance is used in step 322 instead of the shortest distance d1.

  Further, in step 324, in addition to determining whether or not the contact point in the valid list is located at the peripheral edge of the touch surface of the touch detection unit 112, the screen displayed on the display unit 114 can be operated. Although the case where it was determined whether it is located outside a simple element was demonstrated, it is not limited to this. Usually, since the operable element is not disposed on the peripheral portion of the touch surface of the touch detection unit 112, the latter determination may not be performed. That is, in step 324, it may be determined only whether the contact point in the valid list is located at the peripheral edge of the touch surface of the touch detection unit.

  If it is determined in step 316 that there are a plurality of new contact points, steps 318 to 330 may be repeated for each new contact point.

  Further, in the process of determining whether the new contact point detected in step 316 is added to the valid list or the invalid list (steps 318 to 330), further processing may be added. For example, between step 318 and step 320, it is determined whether or not a plurality of contact points in the effective list are close (whether they are located within a predetermined distance). If the distance between these contact points and the new contact point is equal to or greater than a predetermined value, a process of adding the new contact point to the invalid list may be added.

  In step 326, when the contact point in the valid list is moved to the invalid list, a warning that an erroneous touch has occurred may be displayed on the display unit 114. Similarly, in step 328, when a new contact point is added to the invalid list, a warning that an erroneous touch has occurred may be displayed on the display unit 114. If the mobile terminal device 100 includes an acoustic device such as a speaker, a warning sound may be emitted. When receiving the warning, the user knows that he / she is touching the touch surface unintentionally, so that the erroneous touch can be resolved by separating the erroneous touch portion from the touch surface.

  Although the case where the finger touches the touch detection unit 112 has been described above, the present invention is not limited to this. The touch detection unit 112 may be touched with a pen. Even in that case, an erroneous touch by a wrist or the like may occur.

  In the above description, the mobile terminal device has been described, but the present invention is not limited to this. Any electronic device including a touch detection device that accepts a touch operation by a user may be used. For example, the image forming apparatus may employ a touch panel display as the operation unit.

  In addition, the present embodiment is applied to a technique of detecting a two-point press in a resistive touch panel that is disclosed in Patent Document 1 and detects that a middle point is pressed by pressing two points. Incorrect operation can be prevented.

  In this technique, when point A and point B on the panel that are clearly separated are pressed with two pens, that is, “point A is pressed with the first pen → point B is pressed with the second pen and released → When the operation of “release the first pen from the point A” is performed, the touch position output becomes “no → point A → point A and midpoint C → point A → no” of the point B. At this time, if the distance between the point A and the middle point C is equal to or greater than a predetermined reference value, it is determined that the point A and the point B are pressed.

  When this embodiment is applied to this, the points A and B are touched, and the points A and C detected by the steps 302 to 330 in FIG. Added to the valid list or invalid list. Thereafter, in step 322, if the information of the points A and C is included in the valid list, if the distance between the points A and C is equal to or larger than a predetermined reference by the above technique, the points A and B It is determined that is pressed. If either one of the points A and C is an erroneous touch and has been added to the invalid list, the valid list includes only the other of the points A and C. It is not determined that B is pressed. That is, an erroneous operation due to an erroneous touch can be prevented.

  In the resistive touch panel, even if the point B is touched while the point A is touched, the point B is not detected, but the point C is detected. In step 322, the distance between the point A and the point C is detected. The predetermined value d0 to be compared is preferably set to a value (for example, about 5 cm) that is about a half of the value set above (for example, about 10 cm).

(Second Embodiment)
In the first embodiment, the contact points are set to be valid or invalid in consideration of the order in which the contact points are detected. In the second embodiment, the contact point detection order is not considered. , Set the contact point to valid or invalid.

  Also in the present embodiment, as in the first embodiment, a portable terminal device will be described as an electronic device including a touch detection device. The portable terminal device according to the present embodiment is configured in the same manner as in FIG. In the following, reference numerals in FIG. 1 are referred to.

  In the mobile terminal device according to the present embodiment, the program shown in FIG. 7 is executed instead of FIG. The program of FIG. 7 differs from the program of FIG. 3 only in that steps 320 to 328 of FIG. 3 are replaced by steps 500 to 508. In FIG. 7, steps denoted by the same reference numerals as those in FIG. 3 are the same as those in FIG.

  The program of FIG. 7 is started when the power of the mobile terminal device 100 is turned on. After the initial setting at step 300 is executed, a contact point is detected at step 302. Thereafter, the presence / absence of a new contact point is determined in step 326. If there is a new contact point and the valid list includes the contact point (the determination result in step 318 is NO), in step 500, the CPU 102 The distance d3 from the center of the touch surface of the touch detection unit 112 is calculated for the new contact point and the contact point currently included in the valid list. The calculated distance d3 is stored in the RAM 106 in association with information for specifying the contact point.

  In step 502, the CPU 102 reads one distance d3 stored in step 500 from the RAM 106, and determines whether or not the value is larger than a predetermined value d2. The predetermined value d2 is, for example, 10 cm as in the first embodiment. If d3> d2, control proceeds to step 504. Otherwise (d3 ≦ d2), control proceeds to step 506.

  In step 504, the CPU 102 adds the contact point determined in step 502 to the invalid list. At this time, if the contact point determined in step 502 is a new contact point, the specific information, position coordinates, and attribute information are added to the invalid list. An initial value is added to the attribute information. On the other hand, if the contact point determined in step 502 is a contact point included in the valid list, the corresponding contact point information is moved from the valid list to the invalid list, and the corresponding contact point information is valid. Removed from the list.

  In step 506, the CPU 102 adds the contact point determined in step 502 to the valid list. At this time, if the contact point determined in step 502 is a new contact point, the specific information, position coordinates, and attribute information are added to the valid list. An initial value is added to the attribute information. On the other hand, if the contact point determined in step 502 is a contact point included in the valid list, information on the corresponding contact point is maintained.

  In step 508, the CPU 102 determines whether or not the processing in steps 502 to 506 has been executed for all the distances calculated in step 500. If it is determined that all have been completed, control proceeds to step 332. Otherwise, control returns to step 502 and steps 502 to 506 are executed for the distance d3 that has not yet been processed.

  Thereafter, in the same manner as in the first embodiment, in step 332, a touch operation is determined based on contact point information in the valid list, and the corresponding processing is executed. When the mobile terminal device 100 is turned off, this program ends.

  As described above, it is possible to add a contact point that is a predetermined value or more away from the center of the touch surface to the invalid list and determine the user's touch operation without using information on the contact point included in the invalid list. Therefore, it is possible to prevent an erroneous operation due to a user's erroneous touch.

(Third embodiment)
In the first embodiment, a case has been described in which the shortest distance between a new contact point and a contact point in the effective list is compared with one reference value. In the third embodiment, each user is compared. Use the reference value.

  Also in the present embodiment, as in the first embodiment, a portable terminal device will be described as an electronic device including a touch detection device. The portable terminal device according to the present embodiment is configured in the same manner as in FIG. In the following, reference numerals in FIG. 1 are referred to.

  In the mobile terminal device according to the present embodiment, the program shown in FIG. 8 is executed instead of FIG. The program of FIG. 8 is different from the program of FIG. 3 only in that step 600 is added. In FIG. 8, steps denoted by the same reference numerals as those in FIG. 3 are the same as those in FIG.

  The program of FIG. 8 is started when the power of the mobile terminal device 100 is turned on. After the initial setting in step 300 is executed, in step 600, the CPU 102 executes a reference value setting process. The reference value setting process is a process for determining a reference value (predetermined value) used in the determination at step 322.

  The reference value setting process is specifically shown in FIG. In step 620, the CPU 102 displays a message prompting a touch for setting a reference value on the display unit 114 of the touch panel display 110. For example, a message 640 as shown in FIG. 10 is displayed.

  In step 622, the CPU 102 determines whether or not two position coordinate data are received from the touch detection unit 112. If it is determined that it has been received, control proceeds to step 624. Otherwise, step 622 is repeated.

  In step 624, the CPU 102 deletes the displayed message, and calculates the distance L between the two points from the position coordinates of the two points received in step 622.

  In step 626, the CPU 102 calculates the reference value d0 from the distance L calculated in step 624. Specifically, the CPU 102 determines the reference value d0 by multiplying the distance L by a predetermined coefficient a (d0 = L × a). The coefficient a is, for example, 0.7. In this case, if the distance L calculated by the user's touch is 17 cm, for example, the reference value d0 is determined to be 11.9 cm. The calculated reference value d0 is stored in the RAM 106.

  For example, when a touch operation is performed with the index finger, it is assumed that the finger ball, the little finger ball, or the wrist touches the touch surface as an erroneous touch, and the coefficient a is added to the invalid list for the point of erroneous touch. Can be determined.

  The coefficient a is preferably set to an appropriate value according to the two touched points. The coefficient a in the case of determining the reference value from the distance by touching the tip of the thumb and middle finger is smaller than the coefficient used when the reference value is determined from the distance by touching the tip of the thumb and index finger. Can be set. In the case of a normal person, the distance between the tip of the thumb and the middle finger is longer than the distance between the tip of the thumb and the index finger, so that a smaller coefficient a is used to determine the same reference value d0. Multiply by.

  After step 626, control returns to the flow of FIG. 8, and steps 302 to 332 are executed. In the determination process at step 322, the CPU 102 reads the reference value d0 determined at step 626 from the RAM 106 and uses it.

  As described above, similarly to the first embodiment, an erroneous touch by the user can be detected, and an erroneous operation due to the touch can be prevented. If the portable terminal device 100 is used by a plurality of users, an appropriate reference value d0 can be used for each user, and the detection accuracy of erroneous touch can be increased.

  The reference value d0 calculated in step 626 may be stored in the memory 108 that is a nonvolatile memory. By doing so, since the reference value d0 is maintained even when the power of the mobile terminal device 100 is turned off, it is necessary to execute the reference value setting process (step 600) again when the power is turned on next time. There is no. If the mobile terminal device 100 is owned by the user, it is complicated for the user to execute the reference value setting process every time the power is turned on.

  Further, the user may be allowed to select whether or not to save the reference value d0 calculated in step 626. For example, after step 626, a screen for confirming whether or not the calculated reference value needs to be stored is displayed. If the user does not select saving, the reference value d0 is stored in the RAM 106, and the user If saving is selected, the reference value d0 is stored in the RAM 106 and the memory 108.

  In the above description, the case is described in which the user touches two points with two predetermined fingers and the reference value is calculated from the distance between the contact points. However, the present invention is not limited to this. The touch detection unit 112 may be touched by the user with predetermined three or more fingers. Moreover, it does not need to be touched simultaneously. If a resistive film type touch panel is used, touches at a plurality of points cannot be detected at the same time.

  Further, instead of step 620 to step 626, the user may be able to input from the touch panel display 110 using the reference value d0 as a numerical value.

  In the above description, in step 626, the reference value is calculated by multiplying the distance L calculated in step 624 by the predetermined coefficient a. However, the present invention is not limited to this. A table in which the distance L and the reference value d0 are associated with each other may be stored in advance. The reference value d0 can be determined by referring to the table using the distance L.

  Further, when the user performs login authentication, if the reference value d0 is stored in advance for each user (user ID), the corresponding reference value d0 is used when detecting the touch of the user who has passed the login authentication. can do. At this time, physical information (hand size, etc.) may be held for each user, and the reference value d0 may be calculated from the value.

  In the first to third embodiments, the electronic apparatus including the touch panel display in which the touch detection unit is disposed on the display unit has been described. However, the present invention is not limited to this. The display unit and the touch detection unit may be separated and disposed in the electronic device.

  The embodiment disclosed herein is merely an example, and the present invention is not limited to the above-described embodiment. The scope of the present invention is indicated by each claim of the claims after taking into account the description of the detailed description of the invention, and all modifications within the meaning and scope equivalent to the wording described therein are included. Including.

100 Mobile terminal device 102 CPU
104 ROM
106 RAM
108 Memory 110 Touch Panel Display 112 Touch Detection Unit 114 Display Unit 116 Display Control Unit 118 VRAM
120 Timer 122 Bus

Claims (10)

Touch detection means for detecting a point touched by the user;
Setting means for setting the point detected by the touch detection means to be valid or invalid;
An operation determining unit that determines a touch operation by the user based on a point that is effectively set by the setting unit among the points detected by the touch detecting unit;
The setting means has a predetermined distance between the first point and the second point when the touch detection means detects the second point while detecting the first point. A distance determination means for determining whether or not the value is greater than or equal to a value;
The setting means receives the fact that the distance determination means determines that the distance between the first point and the second point is equal to or greater than a predetermined value. An electronic device that invalidates any of the points.   The second point is detected by the touch detection means in a state where the touch detection means detects the first point and the distance determination means sets the first point effectively. When the distance determination means determines that the distance between the first point and the second point is greater than or equal to the predetermined value, the setting means invalidates the second point. The electronic device according to claim 1, wherein the electronic device is set.   In a state where the touch detection unit detects a plurality of points including the first point and the distance determination unit sets the plurality of points effectively, the touch detection unit detects the second point. When the point is detected and the distance determining unit determines that all the distances between the second point and each of the plurality of points are equal to or greater than the predetermined value, the setting unit includes The electronic device according to claim 1, wherein the two points are set to be invalid. The point detected by the touch detection means is a point on the touch surface of a predetermined shape,
A position determination unit that determines whether or not the point detected by the touch detection unit is located in a peripheral portion of the touch surface;
The second point is detected by the touch detection means in a state where the touch detection means detects the first point and the distance determination means sets the first point effectively. The distance determination unit determines that the distance between the first point and the second point is equal to or greater than the predetermined value, and the position determination unit determines that the first point is the peripheral edge of the touch surface. 4. The electronic device according to claim 1, wherein the setting unit sets the first point to invalid in response to being determined to be located in a portion. 5.   5. The point set to invalid by the setting unit is maintained invalid while the point is detected by the touch detection unit. 6. Electronic equipment.   6. The electronic device according to claim 1, further comprising means for presenting a warning in response to the point detected by the touch detection means being set to be invalid by the setting means. The touch detection means is a resistive touch panel,
The touch detection means detects the first point and the second middle point in response to the touch of the second point in a state where the first point is detected,
The first point, the middle point, and the first point are sequentially detected by the touch detection unit, and the first point and the middle point are set to be effective by the setting unit. And further comprising means for determining that the first point and the second point are touched at the same time if the distance between the first point and the middle point is greater than or equal to a predetermined distance. The electronic device according to any one of the above.   The electronic device according to claim 1, wherein the predetermined value is set for each user. A calculation unit that calculates the predetermined value based on a distance between two points touched by the user, detected by the touch detection unit;
The electronic device according to claim 8, wherein the predetermined value is calculated by the calculation unit before the setting by the setting unit is performed. A touch detection unit that includes a touch surface of a predetermined shape and detects a point on the touch surface touched by a user;
Setting means for setting the point detected by the touch detection means to be valid or invalid;
An operation determining unit that determines a touch operation by the user based on a point that is effectively set by the setting unit among the points detected by the touch detecting unit;
In response to the detection of the second point in the state in which the touch detection unit is detecting the first point, the setting unit is configured to perform the operation with respect to each of the first point and the second point. Determining means for determining whether the distance from the center of the touch surface is a predetermined value or more;
The setting means includes
The determination unit sets the point where the distance to the touch surface is determined to be greater than or equal to the predetermined value as invalid,
An electronic device that effectively sets a point at which the distance from the touch surface is not determined to be greater than or equal to the predetermined value by the determination unit.

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