JP4446310B2 - Touch input device and display device - Google Patents

Description

  The present invention relates to a touch input device having a touch panel and a display device including the touch input device.

  In general, there are a plurality of ATMs (automatic (automatic) teller machine), railway ticket vending machines, information terminals such as a geographic guidance system (hereinafter simply referred to as “systems”). A touch panel is mounted on a display surface of a display device on which symbols, for example, buttons representing commands, character input keys, and the like (hereinafter collectively referred to as icons) are displayed. Generally, an instruction, an instruction, etc. are assigned to each icon, and an operator selects an icon corresponding to his / her instruction, instruction, etc., and directly touches a part of the touch panel corresponding to the selected icon with a finger ( When touched), the system identifies which icon is selected according to the touched position on the touch panel, and an operator's command, instruction, or the like is input to the system.

  In the system using the touch panel, the effective range of the icon is set based on the shape, size, position, etc. of each icon displayed on the display surface. The effective range of the icon is, for example, the display range of the icon. The same range is set. When the touch panel is touched, touch position data indicating the touched position (hereinafter sometimes referred to as “touch position”) is acquired, and the touch position indicated by the touch position data is within the effective range of each icon. It is determined whether or not there is. If it is determined that the touch position is within the effective range of the icon, the icon is specified.

  In Patent Document 1, a distance between each button and a position indicated by coordinate data input from a touch panel is calculated, and a distance value obtained for each button is compared. Thus, a direct input device that determines a button having the shortest distance as a designated button is disclosed.

Further, in Patent Document 2, when the touched position is out of any of the plurality of objects displayed on the display screen, the object closest to the touched position or the past tendency is used. A touch input device that extracts an object having the highest probability of being selected as a target candidate is disclosed. The touch input device determines whether the distance between the position of the target candidate and the touched position is within a preset allowable range, and if it is within the allowable range, the target candidate is selected. It is also possible to determine that the target has been performed and perform the necessary processing thereafter.
JP-A-6-266503 JP 2003-67135 A

  Touch position data indicating the touched position is acquired by touching the touch panel. However, due to the position detection accuracy of the touch panel itself and the influence of external noise, the touch position indicated by the touch position data may be different from the true touch position actually touched, and as a result, an incorrect icon is identified. There is.

  In any of the direct input device disclosed in Patent Document 1 and the touch panel input device disclosed in Patent Document 2, if the effective range of adjacent icons is sufficiently far away, there is a possibility that the icon is erroneously determined. rare. However, for example, when an effective range of adjacent icons is close and the distance between the icons cannot be sufficiently secured, such as when displaying a character input keyboard, the operator can touch the touch panel corresponding to the effective range of the predetermined icon. Even if you touch this part, due to the position detection accuracy of the touch panel itself and the influence of external noise, touch position data indicating the true touch position cannot be obtained, and if another icon adjacent to the predetermined icon is touched incorrectly There is a risk of being determined.

  Hereinafter, it will be described with reference to FIG. 7 that the touched icon is erroneously determined.

  FIG. 7 is a schematic diagram showing the relationship between the true touch position actually touched on the touch panel and the touch position indicated by the touch position data. FIG. 7A shows icons A and B arranged adjacent to each other.

  Here, the effective range of each of the icons A and B is the same range as the display range, and it is recognized that the icon A is touched by touching the part corresponding to the display range of the icon A, and the display range of the icon B It is recognized that the icon B is touched by touching the part corresponding to.

  FIG. 7B is a schematic diagram in which an adjacent portion between the icon A and the icon B in FIG. In FIG. 7B, a point C indicates a true touch position of the touch panel actually touched by the operator, and is referred to as a true touch position C in the following description.

  Even though the position touched by the operator is the true touch position C, the touch position indicated by the touch position data is different from the true touch position C. In this case, it may be the touch position D2.

  When the touch position data indicates the touch position D1, since the touch position D1 is within the effective range of the icon A, the system determines that the icon A has been touched (that is, has been identified), and performs the following process. On the other hand, when the touch position data indicates the touch position D2, since the touch position D2 is within the effective range of the icon B adjacent to the icon A, not the icon A, the system determines that the true touch position C is the effective of the icon A. Despite being within the range, it is erroneously determined that the icon B has been specified, and the next processing is performed.

  One way to prevent such erroneous icons from being identified is to widen the dead zone (invalid) range between the valid ranges of adjacent icons.

  As shown in FIG. 8, when the effective range E1 of the icon A is made narrower than the display range H1 of the icon A, and the effective range E2 of the icon B is made narrower than the display range H2 of the icon B, as shown in FIG. A wide dead zone range can be ensured between the range E1 and the effective range E2 of the icon B, thereby preventing an erroneous icon from being specified. Specifically, even when the touch position data indicates the touch position D2, since the touch position D2 is not within the effective range E2 of the icon B, it is possible to prevent the icon B from being erroneously specified.

  However, if the effective range of the icon is reduced in this way, even if the operator correctly touches the portion where the desired icon is displayed, the touch position indicated by the touch position data is not within the effective range of the icon. The desired icon is not specified. For example, when the touch position data acquired by touching the true touch position C indicates the same touch position D3 (see FIG. 8) as the true touch position C, the touch position D3 is within the effective range E1 of the icon A. Therefore, the icon A is not specified.

  In this case, the operator must repeat the touch on the touch panel until the touch position indicated by the touch position data falls within the effective range of the desired icon. In particular, when a plurality of icons are displayed at a narrow interval, if a wide dead zone range is secured, the effective range of each icon is narrowed, and as a result, operability is degraded.

  In addition, in order to reduce the influence of external noise and acquire highly accurate touch position data, an average of touch position data may be performed. However, since the touch panel is expected to be used in various external environments, if you try to ensure the required accuracy even in an external environment with a lot of external noise, the touch time data accuracy will be increased by increasing the integration time. Need to be high. In this case, the waiting time for the operator becomes long, and the response to the touch becomes slow (responsiveness decreases).

  The present invention has been made in view of the above-described viewpoints, and an object thereof is to provide a touch input device that can prevent a target from being erroneously specified and prevent deterioration in responsiveness and operability. To do.

  Another touch input device of the present invention acquires a touch panel used by being attached to a display surface of a display unit capable of displaying a plurality of objects, and touch position data indicating a position where the touch panel is directly or indirectly touched. A touch input device comprising touch position data acquisition means and control means, wherein the control means receives representative point position data indicating positions of representative points of the plurality of objects displayed on the display surface. Receiving and calculating at least the shortest distance among the distances between the position indicated by the touch position data and the representative point position indicated by the representative point position data of the plurality of objects, from the plurality of objects Obtained by a distance calculation means for extracting one object corresponding to the shortest distance, a discrimination threshold control means for setting a discrimination threshold, and the distance calculation means. A comparison means for comparing the shortest distance set with the discrimination threshold set by the discrimination threshold control means, and the comparison result by the comparison means is that the shortest distance is equal to or smaller than the discrimination threshold. A signal indicating that the extracted object has been identified, and if the comparison result by the comparison means indicates that the shortest distance is greater than the determination threshold, the touch position The touch position data is further acquired by the data means, the integrated average value of the already acquired touch position data is obtained, the discrimination threshold is increased by the threshold control means, and the position indicated by the integrated average value by the distance calculation means And re-calculating the distance between the representative point position indicated by the representative point position data of the one extracted object and Then, the value indicating the recalculated distance is recompared with the increased determination threshold value, and if the recomparison result is equal to or smaller than the increased determination threshold value, A signal indicating that the extracted object is specified is output.

  In one embodiment, when the control means does not output a signal indicating that the extracted object is specified by the re-comparison result, the control means further acquires touch position data by the touch position data means, and the touch The integrated average of the position data, the increase of the discrimination threshold, and the re-comparison are further repeated.

  In one embodiment, the determination threshold value control means increases the determination threshold value based on the number of times the integrated averaging is performed.

  In one embodiment, the touch panel includes a transparent conductive film and a plurality of terminal electrodes provided on the transparent conductive film, and the touch position data acquisition unit applies a voltage to the plurality of terminal electrodes, Measure the amount of change in the current flowing through each of the plurality of terminal electrodes changed by touching the transparent conductive film of the touch panel directly or indirectly, and acquire the touch position data based on the amount of change The discrimination threshold control means sets the discrimination threshold according to the sum of the amount of change in the current flowing through each of the plurality of terminal electrodes. For example, when the sum of the current change amounts is large, a relatively large value is set as the determination threshold value, and when the sum of the current change amounts is small, a relatively small value is set as the determination threshold value.

  In one embodiment, the determination threshold value varies depending on a direction connecting the position indicated by the touch position data and the position of the representative point of the one object.

  In one embodiment, the control means includes at least one of a distance between a position indicated by the integrated average value by the distance calculation means and a representative point position indicated by representative point position data of the plurality of objects. Recalculate the shortest distance, re-extract one object corresponding to the recalculated shortest distance from the plurality of objects, and the re-extracted object is the same as the already extracted object When the re-extracted object is the same as the already extracted object, the determination threshold value is provisionally set by the determination threshold value control means, and the temporarily set determination threshold value is already set. It is determined whether the threshold value is the same as the determination threshold value, and when the temporarily set determination threshold value is the same as the already set determination threshold value, the determination threshold value already set by the determination threshold value control unit And recompare the shortest distance recalculated by the comparison means with the increased discrimination threshold, and the recomparison result is equal to or smaller than the increased discrimination threshold with the recalculated shortest distance. A signal indicating that the extracted object has been specified is output.

  In one embodiment, when the re-extracted object is different from the already extracted object, the control means newly sets a discrimination threshold by the discrimination threshold control means, and is recalculated by the comparison means. The re-extracted when the comparison result indicates that the re-calculated shortest distance is equal to or smaller than the newly set determination threshold. A signal indicating that the specified object has been identified is output.

  In one embodiment, the control unit newly sets the temporarily set determination threshold by the determination threshold control unit when the temporarily set determination threshold is different from the already set determination threshold, or Another determination threshold value different from the temporarily set determination threshold value is newly set, the shortest distance recalculated by the comparison unit is compared with the newly set determination threshold value, and the comparison result is When the recalculated shortest distance indicates that it is equal to or smaller than the newly set discrimination threshold, a signal indicating that the extracted object is specified is output.

  A touch input device according to the present invention includes a touch panel used by being attached to a display surface of a display unit capable of displaying a plurality of objects, and touch for acquiring touch position data indicating a position where the touch panel is directly or indirectly touched. A touch input device comprising position data acquisition means and control means, wherein the control means receives representative point position data indicating positions of representative points of the plurality of objects displayed on the display surface, A first distance that is the shortest distance and a second shortest distance between the positions indicated by the touch position data and the representative point positions indicated by the representative point position data of the plurality of objects. Calculating at least a second distance and calculating a distance difference between the first distance and the second distance, and corresponding to the first distance among the plurality of objects. Distance calculation means for extracting a first object and a second object corresponding to the second distance, determination threshold control means for setting a determination threshold, and the distance difference obtained by the distance calculation means and the determination Comparison means for comparing with the discrimination threshold set by the threshold control means, and when the comparison result by the comparison means indicates that the distance difference is equal to or greater than the discrimination threshold, the first When a signal indicating that the object has been specified is output and the comparison result by the comparison means indicates that the distance difference is smaller than the determination threshold value, the touch position data means further outputs touch position data. Obtaining and obtaining an integrated average value of the already acquired touch position data, reducing the discrimination threshold by the discrimination threshold control means, and calculating the integration by the distance calculation means Between the position indicated by the average value and the position of the representative point of the first object, and between the position indicated by the integrated average value and the position of the representative point of the second object Recalculate the distance difference between the second distance, the first distance and the second distance, re-compare the distance difference recalculated by the comparison means and the reduced discrimination threshold, and re-comparison If the result indicates that the recalculated distance difference is equal to or greater than the reduced discrimination threshold, a signal indicating that the extracted first object has been identified is output.

  In one embodiment, when the control means does not output a signal indicating that the extracted first object is specified by the recomparison result, the control means further acquires touch position data by the touch position data means, The integrated average of the touch position data, the decrease of the discrimination threshold, and the re-comparison are further repeated.

  In one embodiment, the control means decreases the discrimination threshold based on the number of times of performing the integration average.

  In one embodiment, the touch panel includes a transparent conductive film and a plurality of terminal electrodes provided on the transparent conductive film, and the touch position data acquisition unit applies a voltage to the plurality of terminal electrodes, Measure the amount of change in the current flowing through each of the plurality of terminal electrodes changed by touching the transparent conductive film of the touch panel directly or indirectly, and acquire the touch position data based on the amount of change The discrimination threshold control means sets the discrimination threshold according to the sum of the amount of change in the current flowing through each of the plurality of terminal electrodes. For example, when the sum of the current change amounts is large, a relatively small value is set as the determination threshold, and when the sum of the current change amounts is small, a relatively large value is set as the determination threshold.

  In one embodiment, the determination threshold value varies depending on a direction connecting the position indicated by the touch position data and the position of the representative point of the first object.

  In one embodiment, the control means is the largest of the distances between the position indicated by the integrated average value by the distance calculation means and the position of the representative point indicated by the representative point position data of the plurality of objects. Recalculate at least a first distance that is a short distance and a second distance that is a second shortest distance, and recalculate a distance difference between the recalculated first distance and the recalculated second distance; Re-extracting a first object corresponding to the recalculated first distance and a second object corresponding to the recalculated second distance from the plurality of objects; It is determined whether the second object is the same as the first and second objects that have already been extracted, and the first and second objects from which the re-extracted first and second objects have already been extracted If they are the same, the discrimination threshold control means Temporarily set another threshold, determine whether the temporarily set determination threshold is the same as the already set determination threshold, and if the temporarily set determination threshold is the same as the already set determination threshold, The discrimination threshold set by the discrimination threshold control unit is decreased, the distance difference recalculated by the comparison unit is recompared with the reduced discrimination threshold, and a recomparison result is recalculated. A signal indicating that the extracted first object is specified is output when the difference in distance is equal to or greater than the reduced determination threshold.

  In one embodiment, the control means newly sets a discrimination threshold by the discrimination threshold control means when the re-extracted first and second objects are different from the first and second objects already extracted. And comparing the recalculated distance difference with the newly set discrimination threshold by the comparing means, and whether the comparison result is equal to the newly set discrimination threshold. If it is larger, a signal indicating that the re-extracted first object is specified is output.

  In one embodiment, the control unit newly sets the temporarily set determination threshold by the determination threshold control unit when the temporarily set determination threshold is different from the already set determination threshold, or Another determination threshold value different from the temporarily set determination threshold value is newly set, and the distance difference recalculated by the comparison unit is compared with the newly set determination threshold value. When the recalculated distance difference indicates that it is equal to or larger than the newly set discrimination threshold, a signal indicating that the extracted first object is specified is output.

  According to the touch input device of the present invention, it is possible to prevent an object from being erroneously specified while preventing a decrease in responsiveness and operability.

(Embodiment 1)
Hereinafter, a touch input device according to a first embodiment of the present invention and a display device including the touch input device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic block diagram of a display device 300 of the present embodiment. The display device 300 includes a touch input device 100 and a display unit 200.

  The display unit 200 includes a display unit 210 that displays an object on a display surface, and a display control unit 220 that controls the display unit 210. The display unit 210 is a liquid crystal display element, for example, and has a display resolution of wide VGA (800 × 480 pixels) on the entire screen. The object is displayed on the display surface of the display unit 210 under the control of the display control unit 220. In this specification, the object includes a video, characters, icons, and the like. The icon includes a plurality of symbols, for example, buttons representing commands, character input keys, and the like.

 The touch input device 100 acquires the touch position data indicating the touched position of the touch panel 110 by touching the touch panel 110 directly or indirectly with the touch panel 110 attached to the display surface of the display unit 210. Touch position data acquisition unit 120 and a control unit 130 for controlling the touch position data acquisition unit 120.

  The position of the representative point of the object is set in advance within the display range of the object displayed on the display surface of the display unit 210, and the position of the representative point of the object is indicated by the representative point position data. The position of the representative point of the object is, for example, the center position of the object. The representative point may vary depending on the outer shape of the object. When the target has an isotropic outer shape, the representative point may be the center of the target, and when the target has an anisotropic outer shape, the representative point is It may be a point on the outer edge of the object. Further, when the object is an icon, the icon shape actually displayed on the display surface of the display unit 210 may be set by replacing it with a simple shape. For example, the icon is displayed on the desktop of a personal computer. Assuming a square or circle that is one size larger than the icon, such as an icon, the position of the representative point of the icon when treating the square or circle as the effective range of the icon regardless of the outline of the displayed icon Is not limited to the center position of the icon itself, and may be the position (center of gravity) of the effective range (for example, a square or a circle) of the icon.

  The representative point position data is stored in the display control unit 220, and the display control unit 220 touches the display unit 210 and the representative point position data of the displayed object (each object when a plurality of objects are displayed). The data is output to the control unit 130 of the input device 100. The representative point position data is given as coordinate data (X coordinate, Y coordinate) on the display surface of the display unit 210, for example.

  The touch panel 110 has a transparent area. In the display device 300, the touch panel 110 is attached to the display surface of the display unit 210. The operator can see the display surface of the display unit 210 through the transparent area of the touch panel 110 and touches the part of the touch panel corresponding to the object displayed on the display surface of the display unit 210. The touch panel 110 is, for example, a capacitive coupling type touch panel, and the capacitive coupling type touch panel is a transparent conductive film for position detection (not shown in FIG. 1, hereinafter simply referred to as a transparent conductive film). And terminal electrodes (not shown in FIG. 1) provided at the four corners of the transparent conductive film.

  When the touch panel 110 is touched, the touch position data acquisition unit 120 acquires touch position data indicating the touched position of the touch panel 110. The touch position data acquisition unit 120 applies the same voltage to a terminal electrode (not shown in FIG. 1) of the touch panel 110 and measures the current flowing through each of the terminal electrodes. When the touch panel 110 is touched (touched), the magnitude of the current flowing through the terminal electrode changes, and touch position data is generated and acquired based on the result of measuring the amount of change in the current. The touch position data is also given as coordinate data (X coordinate, Y coordinate) on the display surface of the display unit 210, for example, similarly to the position data of the displayed object.

  Although it is ideal that the touch position data acquired by the touch position data acquisition unit 120 indicates the true touch position that is actually touched, the touch position is affected by the position detection accuracy of the touch panel itself and the influence of external noise. The data may indicate a position that is different from the true touch position. In this specification, the accuracy of the position indicated by the touch position data may be referred to as the accuracy of the touch position data. The accuracy of the touch position data depends on the position acquisition principle of the touch panel 110, the circuit configuration, external noise, and the like, but is generally on the order of several percent with respect to the screen full scale of the display unit 210.

  The touch position data acquisition unit 120 acquires touch position data asynchronously with the synchronization signal of the display unit 210 or intermittently according to an external trigger. Alternatively, in order to reduce the influence of external noise, the touch position data acquisition unit 120 acquires touch position data in synchronization with a vertical synchronization signal or the like.

  As described above, the representative point position data indicating the position of the representative point of the object is transmitted to the control unit 130, and when the touch position data acquisition unit 120 acquires the touch position data, the control unit 130 The distance between the position indicated by the position data and the position of the representative point of the object is calculated. When a plurality of objects are displayed, the distance between the position indicated by the touch position data and the position of the representative point of each object indicated by the representative point position data is calculated, respectively. An object corresponding to the distance is extracted. In the following description, the distance between the position indicated by the touch position data calculated in this way and the position of the representative point of the object is referred to as a distance L. When a plurality of objects are displayed, the distance between the representative points of the extracted objects (that is, the shortest distance) is the distance L.

  In the touch input device 100 of the present embodiment, a discrimination threshold is set in the control unit 130 in advance. In the following description, this determination threshold is referred to as a determination threshold T. After calculating the distance L, the control unit 130 compares the value indicating the distance L with the discrimination threshold T. Note that the determination threshold value may vary depending on the object, and the determination threshold value may differ depending on the direction connecting the position indicated by the touch position data and the position of the representative point of the object.

  As a result of the comparison, when the value indicating the distance L is equal to or less than the determination threshold T, that is, when the distance between the position indicated by the touch position data and the position of the representative point of the object is shorter than the predetermined distance, the control is performed. Unit 130 outputs a signal indicating that the object has been identified. When the object is specified, the control unit 130 performs the following process. For example, the display control unit 220 causes the display unit 210 to display the next screen according to an instruction from the control unit 130.

  On the other hand, as a result of comparison, when the value indicating the distance L is larger than the discrimination threshold T, that is, when the distance between the position indicated by the touch position data and the position of the representative point of the object is longer than a predetermined distance The control unit 130 causes the touch position data acquisition unit 120 to further acquire touch position data and performs an average of the touch position data. The cumulative average of the touch position data is performed by averaging the sum of the previously acquired touch position data and the newly acquired touch position data. By performing integration averaging, the influence of external noise can be reduced and the accuracy of touch position data can be improved.

  Next, the control unit 130 calculates the distance between the position indicated by the touch position data obtained by the integration averaging and the position of the representative point of the object. In the following description, this distance is referred to as a distance L ′.

  The control unit 130 also increases the discrimination threshold T. In the following description, a discrimination threshold obtained by increasing the discrimination threshold T is referred to as a discrimination threshold T ′. The discrimination threshold is increased according to, for example, the number of integrations. That is, the discrimination threshold value is increased as the accuracy of the touch position data increases.

  Next, the control unit 130 re-compares the value indicating the distance L ′ with the determination threshold T ′. As a result of the re-comparison, when the value indicating the distance L ′ is equal to or smaller than the determination threshold T ′, the control unit 130 outputs a signal indicating that the object has been specified. When the object is specified, the control unit 130 performs the following process. For example, the display control unit 220 causes the display unit 210 to display the next screen according to an instruction from the control unit 130.

  Hereinafter, with reference to FIG. 1 and FIG. 2, an operation procedure of the display device 300 of the present embodiment will be described.

  In the activated display device 300, an initial screen or a standby screen is displayed on the display unit 210. Under the control of the display controller 220, the object is displayed such that the position of the representative point of the object is the position indicated by the representative point position data on the display surface of the display unit 210. The control unit 130 of the touch input device 100 receives the representative point position data from the display control unit 220 (S410 in FIG. 2).

  The touch panel 110 is in a standby state, and when the operator touches the touch panel 110, the touch position data acquisition unit 120 acquires touch position data indicating the touched position of the touch panel 110. For example, the touch position data acquisition unit 120 acquires the touch position data based on the result of measuring the current flowing through the terminal electrode of the touch panel 110 during 16.7 msec in accordance with the vertical synchronization period of the display unit 200. This time is shorter than a general time (0.1 second to 1 second) from when the operator touches the touch panel 110 with a finger and releases the finger from the touch panel 110. That is, the touch position data is acquired while the operator touches the touch panel once. The control unit 130 determines whether or not the touch position data acquisition unit 120 has acquired touch position data (S420 in FIG. 2). If it is determined that the touch position data acquisition unit 120 has not acquired the touch position data, the control unit 130 waits until the touch position data is acquired.

  A discrimination threshold T is preset in the control unit 130. The discrimination threshold T may be different for each object, and a plurality of discrimination thresholds may be set for one object. For example, when the object has an anisotropic shape, or when the object is arranged adjacent to one direction and the object is not arranged adjacent to the other direction, The determination threshold value in one direction from the representative point of the target object and the determination threshold value in another direction may be set to different values. Here, for the purpose of preventing the description from being overly complicated, the description will be made assuming that the determination threshold values of a plurality of objects are constant.

  When the touch position data is acquired, the control unit 130 calculates a distance L between the position indicated by the touch position data and the position of the representative point of the target object indicated by the representative point position data. Is compared with the discrimination threshold T (S430 in FIG. 2). Note that the discrimination threshold T is initially set to a sufficiently small value so that erroneous identification is not performed.

  As a result of the comparison in (S430 in FIG. 2), when the value indicating the distance L is equal to or less than the determination threshold T, the target object is specified (S470 in FIG. 2). For example, when the position indicated by the touch position data is near the position of the representative point of the object, the value indicating the distance L is small, and the value indicating the distance L is equal to or less than the determination threshold T.

  When the object is specified (S470 in FIG. 2), the control unit 130 performs the following process. For example, the display control unit 220 causes the display unit 210 to display the next screen according to an instruction from the control unit 130.

  In this case, since it is determined in a short time that the object is touched, the display device 300 can immediately respond to the touch of the operator.

  On the other hand, as a result of the comparison (S430 in FIG. 2), when the value indicating the distance L is larger than the determination threshold T, that is, the position indicated by the touch position data is away from the position of the representative point of the object, When the distance L between the position indicated by the touch position data and the position of the representative point of the object is relatively long, the object is not specified. Therefore, it is possible to prevent an erroneous object from being specified from a plurality of objects. In addition, even when only one target object is displayed, it is effective that an erroneous determination is made that the target object is specified when the operator accidentally touches the touch panel without intention of touching the target object. Can be prevented.

  At this time, the control unit 130 may output to the display control unit 220 a signal indicating that the object has not been specified or a signal indicating that the specification of the object has been reserved.

  When the signal indicating that the object is specified by the comparison of (S430 in FIG. 2) is not output, the control unit 130 further acquires the touch position data by the touch position data acquisition unit 120, and the integrated average of the touch position data (S440 in FIG. 2). By performing the integration averaging of the touch position data, the influence of external noise is reduced and the accuracy of the touch position data is improved.

  Next, the control unit 130 recalculates the distance L ′ between the position indicated by the touch position data subjected to the integration average and the position of the representative point indicated by the representative point position data.

  The control unit 130 obtains a discrimination threshold T ′ obtained by increasing the discrimination threshold T (S450 in FIG. 2).

  Next, the control unit 130 re-compares the value indicating the distance L ′ with the discrimination threshold T ′ (S460 in FIG. 2).

  As a result of the re-comparison (S460 in FIG. 2), when the value indicating the distance L ′ is equal to or smaller than the determination threshold T ′, the control unit 130 outputs a signal indicating that the object has been identified (in FIG. 2). S470). In the re-comparison in (S460 in FIG. 2), since the discrimination threshold T ′ increased from the discrimination threshold T used in the comparison in (S430 in FIG. 2) is used, for example, the comparison in (S430 in FIG. 2) Even when the value indicating the distance L is larger than the discrimination threshold T and the position indicated by the touch position data does not change even if the integration averaging is performed (that is, the distance L is equal to the distance L ′), the distance The value indicating L ′ may be equal to or less than the discrimination threshold T ′. In this case, even if it is not determined that the object has been touched in the comparison in (S430 in FIG. 2), the object is identified in the re-comparison in (S460 in FIG. 2), so the operator repeats the touch. It does not have to be.

  As described above, in the re-comparison (S460 in FIG. 2), since the highly accurate touch position data and the discrimination threshold T ′ obtained by increasing the discrimination threshold T are used, the operability of the touch input device 100 is deteriorated. It is possible to suppress erroneous identification while preventing the occurrence of the problem.

  When the object is specified (S470 in FIG. 2), the control unit 130 performs the following processing. For example, the display control unit 220 causes the display unit 210 to display the next screen according to an instruction from the control unit 130. When the display unit 210 displays a screen including a new object under the control of the display control unit 220, the previous determination threshold value is reset and a new object determination threshold value is initialized.

  As a result of the re-comparison (S460 in FIG. 2), when the value indicating the distance L ′ is larger than the determination threshold T ′, the integrated average of touch position data (S440 in FIG. 2) and the increase in the determination threshold (S450 in FIG. 2). ) And re-comparison (S460 in FIG. 2) are repeated. Also in this case, the distance between the position indicated by the touch position data subjected to the cumulative average and the position of the representative point of the object is increased in the re-comparison when the repetition is performed (S460 in FIG. 2). If it is less than or equal to the determined discrimination threshold, the object is specified (S470 in FIG. 2). The accuracy of the touch position data increases as the integration average is performed.

  Note that once the operator's finger has left the touch panel 110, it may be set to return to (S420 in FIG. 2).

  As described above, in the touch input device 100 according to the present embodiment, when the accuracy of the touch position data is low, the comparison is performed using the determination threshold T, and the target is when the value indicating the distance L is equal to or less than the determination threshold T. If the accuracy of the touch position data is high while outputting a signal indicating that an object has been specified, re-comparison is performed using the discrimination threshold T ′ obtained by increasing the discrimination threshold T to indicate the distance L ′. When the value is equal to or less than the discrimination threshold T ′, it is determined that the object is touched.

  In other words, if the accuracy of the touch position data is low, it indicates that the object has been identified in order to prevent making an incorrect decision due to a position shift indicated by the touch position data with respect to the touch position. Strictly set the conditions for outputting the signal, and only when it can be said that the object has been touched reliably, it is determined in a short time that the object has been touched, otherwise the object is identified It is reserved to output a signal indicating that this has been done. On the other hand, when the accuracy of the touch position data is improved, erroneous determination is less likely to occur. Therefore, the conditions for outputting a signal indicating that the object has been specified are relaxed. Therefore, according to the touch input device 100 of the present embodiment, it is possible to prevent an object from being erroneously specified while preventing a decrease in responsiveness and operability.

  Hereinafter, a more specific configuration of the display device 300 according to the present embodiment will be described with reference to FIG.

  The control unit 130 of the touch input device 100 includes an integration average unit 131 that performs integration averaging of the touch position data acquired by the touch position data acquisition unit 120, and the position indicated by the touch position data and the position of the representative point of the object. A distance calculation unit 132 that calculates a distance between the comparison unit 133 that compares a value indicating the distance calculated by the distance calculation unit 132 with a determination threshold value, a determination threshold value control unit 134 that controls the determination threshold value, An integration counter 135 that counts the number of times that the integration average is performed by the integration average unit 131 and an object specifying signal transmission unit 136 that transmits a signal indicating that the object has been touched are included.

  The display control unit 220 of the display unit 200 includes a display screen drawing unit 221, an object data storage unit 222, and a main system control unit 223. The display screen drawing unit 221 causes the display unit 210 to display a screen including the object. The object data storage unit 222 stores data related to the object, specifically, representative point position data of the object, data indicating the display range of the object, and the like. The main system control unit 223 controls the object data storage unit 222 and the display screen drawing unit 221. Under the control of the main system control unit 223, the target object data storage unit 222 calculates data about the target object displayed on the display unit 210 (for example, representative point position data) between the display screen drawing unit 221 and the touch input device 100. Output to the unit 132.

  The object specifying signal sending unit 136 outputs a specifying signal to the main system control unit 223 of the display unit 200 when the object is specified. If the object specifying signal sending unit 136 does not output a signal indicating that the object has been specified by comparison, the signal indicating that the object has not been determined or the specifying of the object is reserved. A signal indicating this may be output to the main system control unit 223.

  Here, with reference to FIG. 3 and FIG. 4, an operation procedure of components of the control unit 130 and the display control unit 220 in the touch input device 100 of the present embodiment will be described. Here, a case where a plurality of objects are displayed will be described.

  Under the control of the main system control unit 223, the display screen drawing unit 221 causes each of the objects so that the positions of the representative points of the plurality of objects are the positions indicated by the representative point position data on the display surface of the display unit 210. Is displayed. The distance calculation unit 132 receives the representative point position data from the object data storage unit 222 (S410 in FIG. 4). The operator views a plurality of objects displayed on the display surface of the display unit 210 via the touch panel 110, selects one of the plurality of objects, and the touch panel 110 corresponding to the object. Touch the part.

  When the touch panel 110 is touched, the touch position data acquisition unit 120 acquires touch position data indicating the touched position of the touch panel 110 (S420 in FIG. 4). On the other hand, if the touch panel 110 is not touched, the touch position data acquisition unit 120 cannot acquire the touch position data and waits until the touch panel 110 is touched.

  When the touch position data acquisition unit 120 acquires the touch position data (S420 in FIG. 4), the distance calculation unit 132 calculates the position indicated by the touch position data and the position of the representative point indicated by the representative point position data. The distance between them is calculated, and based on the calculation result, one object corresponding to the representative point position data indicating the position of the representative point closest to the position indicated by the touch position data is extracted from the plurality of objects. (S422 in FIG. 4). In the following description, one extracted object is also referred to as a nearest object, and a distance (shortest distance) between the position indicated by the touch position data and the position of the representative point of the nearest object is referred to as a distance L. .

  Note that the distance calculation unit 132 does not necessarily need to calculate the distances between the positions indicated by the touch position data and the positions of the representative points of all objects in order to calculate the shortest distance. For example, the display surface of the display unit 210 is assigned to a plurality of blocks, and only the distance between the block including the position indicated by the touch position data and the object existing in the block adjacent to the block is calculated, and the remaining blocks You may abbreviate | omit the calculation of the distance about the target object which exists in.

  The discrimination threshold control unit 134 sets the discrimination threshold T (S424 in FIG. 4). Here, the discrimination threshold T is set in advance to a relatively small value. Due to the influence of external noise, the position indicated by the touch position data may deviate greatly from the touch position that is actually touched. However, if the discrimination threshold T is set to a small value, It is possible to prevent an erroneous determination that an object not touched by the person is touched.

  The discrimination threshold value may be set by a function of the count value of the integrated average and the parameter. For example, the function is (ab− (n + 1)) (where a and b are parameters (a> b> 0), n Is the number of counts over which the cumulative average was performed). Note that the value of “a” is set so as to cover a range in which an object is considered to be selected in an ideal case where there is no error due to external noise or the like, and the effective ranges of a plurality of objects do not overlap. The value of “b” may be set so as to be within an error range of detected coordinates due to realistically assumed noise. Of course, other functions may be used. If random noises according to the normal distribution are integrated and averaged n times, the standard deviation decreases in proportion to 1 / √ (n + 1). Therefore, the above function may be set to (ab−√ (n + 1)).

  The parameters a and b are parameters determined by the discrimination threshold control unit 134 according to the position indicated by the touch position data. The values of the parameters a and b may be different depending on, for example, the nearest object, or may be different depending on the position indicated by the touch position data even if the object is the same nearest object. For example, when the object has an anisotropic shape, or when the object is arranged adjacent to one direction and the object is not arranged adjacent to the other direction, The parameter value when the position indicated by the touch position data exists in a certain direction from the representative point of the object may be different from the parameter value when the position exists in another direction.

  Here, if the parameters are a1 and b1, the count number is “0”, and the discrimination threshold T = a1−b1.

  The comparison unit 133 compares the value indicating the distance L with the discrimination threshold T (S430 in FIG. 4). As a result of the comparison by the comparison unit 133 (S430 in FIG. 4), when the value indicating the distance L is equal to or less than the determination threshold T, that is, between the position indicated by the touch position data and the position of the representative point of the nearest object. Is shorter than the predetermined distance, the target object is identified recently (S470 in FIG. 4). For example, when the position indicated by the touch position data is near the center of the nearest object, the value indicating the distance L is smaller than the determination threshold T, and the nearest object is specified in a short time.

  The specific signal is set in advance for each object, and when the latest object is specified, the object specifying signal sending unit 136 sends the specific signal corresponding to the latest object to the main system control unit 223 of the display unit 200. Output. The main system control unit 223 performs predetermined processing according to the specific signal.

  On the other hand, as a result of the comparison by the comparison unit 133 (S430 in FIG. 4), when the value indicating the distance L is larger than the determination threshold T, that is, the position indicated by the touch position data and the position of the representative point of the nearest object If the distance between is longer than a predetermined distance, the object is not identified recently. At this time, the target object specifying signal sending unit 136 may output a signal indicating that the target object has not been determined or a signal indicating that the target object has been reserved to the main system control unit 223. .

  When a signal indicating that an object has been identified recently is not output by the comparison, the touch position data acquisition unit 120 further acquires touch position data, and the integration average unit 131 performs integration average of the touch position data (FIG. 4). S440). By performing the integration averaging in this way, highly accurate touch position data is acquired. When the integration averaging is performed (S440 in FIG. 4), the integration counter 135 updates the count number from “0” to “1”. However, the count value updated to the function in the discrimination threshold control unit 134 is substituted into the function when a discrimination threshold is newly set in S424 described later and when the discrimination threshold is reset in S450. .

  As described above, the nearest object has already been extracted by calculating the shortest distance in (S422 in FIG. 4). For example, the objects are arranged relatively adjacent to each other, and two or three or more objects are extracted. When the middle point of the target object is touched, the already extracted recent target object may be different from the target object closest to the position indicated by the integrated average touch position data due to the influence of external noise. . In this case, the object closest to the second and subsequent objects in (S422 in FIG. 4) is the object closest to the position indicated by the integrated average value.

  Therefore, after the integration average unit 131 performs the integration average of the touch position data, the distance calculation unit 132 includes at least the distance between the position indicated by the integration average value and the positions of the representative points of the plurality of objects. The shortest distance is recalculated, and the object corresponding to the recalculated shortest distance is re-extracted from a plurality of objects (S442 in FIG. 4). In the following description, the recalculated shortest distance is also referred to as a distance L ′, and an object corresponding to the distance L ′ is also referred to as a re-extracted nearest object.

  The distance calculation unit 132 may perform recalculation of distances for all objects, or, as described above, objects existing in a block including the position indicated by the integrated average value and a block adjacent to the block. The distance may be recalculated only for objects. Alternatively, when the display unit 210 displays a keyboard, it is highly likely that one of the objects that are close to the fourth in the first calculation will be the closest object after the integration average. The distance calculation unit 132 may recalculate only the distance for the object that is considered to be close to the fourth.

  Next, it is determined whether the re-extracted recent object is the same as the already extracted recent object (S442 in FIG. 4).

  Since the discrimination threshold may vary depending on the object, if the re-extracted recent object is different from the already extracted recent object, it is necessary to use the discrimination threshold according to the re-extracted recent object It becomes.

  Therefore, if the re-extracted recent object is different from the extracted recent object as a result of the determination in (S442 in FIG. 4), the determination threshold control unit 134 determines the determination threshold based on the re-extracted recent object. T ″ is newly set (S424 in FIG. 4), and the comparison unit 133 compares the recalculated L ′ with the discrimination threshold T ″ (S430 in FIG. 4). At this time, if the parameters determined by the position indicated by the integrated average value are a2 and b2, the count number is “1”, so the discrimination threshold is T ″ = a2−b2 / 2.

  As a result of the comparison by the comparison unit 133 (S430 in FIG. 4), when the recalculated distance L ′ is equal to or smaller than the determination threshold T ″, the closest object is identified (S470 in FIG. 4). In this case, the object specifying signal sending unit 136 outputs a signal indicating that the re-extracted object has been specified to the main system control unit 223.

  When the recalculated distance L ′ is larger than the determination threshold T ″ as a result of the comparison by the comparison unit 133 (S430 in FIG. 4), the touch position data is further acquired and integrated average (S440 in FIG. 4) again. ) And the recent object re-extraction and determination (S442 in FIG. 4).

  On the other hand, as a result of the determination in (S442 in FIG. 4), when the re-extracted nearest object is the same as the already-extracted nearest object, the discrimination threshold control unit 134 determines the discrimination threshold T ″ for the same object. 'Is temporarily set (S444 in FIG. 4). The discrimination threshold is provisionally set based on a parameter determined by the position indicated by the re-extracted recent object and the integrated average value. When the function is used, the count number is “1” as described above, but the updated count number is not yet assigned to the function.

  Next, it is determined whether or not the temporarily set discrimination threshold T ′ ″ is the same as the already set discrimination threshold T (S444 in FIG. 4).

  As described above, the determination threshold value is, for example, when the target object has an anisotropic shape, or when the target object is adjacently arranged in one direction and the target object is adjacent in another direction. If the position indicated by the touch position data is in a certain direction from the representative point of the object, the determination threshold may be different from the determination threshold in the other direction. If the temporarily set discrimination threshold is different from the already set discrimination threshold, it is necessary to set a discrimination threshold corresponding to the position indicated by the integrated average value.

  Accordingly, when the determination threshold value T ′ ″ temporarily set is different from the already set determination threshold value T as a result of the determination in (S444 in FIG. 4), the parameter after the integration averaging is performed before the integration averaging is performed. If the parameters determined by the position indicated by the integrated average value are a3 and b3, which are different from the parameters, the temporarily set discrimination threshold is T ′ ″ = a3−b3.

  Next, the discrimination threshold control unit 134 newly sets a discrimination threshold T ′ ″ based on a function of the parameter determined by the position indicated by the accumulated average value and the number of times of performing the accumulated average (FIG. 4). S424). Here, in the discrimination threshold control unit 134, the updated count number “1” is substituted into the function, and the discrimination threshold becomes T ″ ″ = a3−b3 / 2.

  As a result of the comparison by the comparison unit 133 (S430 in FIG. 4), if the recalculated distance L ′ is less than or equal to the newly set discrimination threshold T ″ ′, the target object is identified recently (S470 in FIG. 4). ). In this case, the object specifying signal sending unit 136 outputs a signal indicating that the re-extracted object has been specified to the main system control unit 223.

  In addition, when the recalculated distance L ′ is larger than the newly set discrimination threshold T ′ ″ as a result of the comparison by the comparison unit 133 (S430 in FIG. 4), the touch position data is further acquired and integrated again. An average (S440 in FIG. 4), re-extraction and determination of a recent object (S442 in FIG. 4), and provisional setting and determination of a determination threshold (S444 in FIG. 4) are performed.

  Here, when the determination threshold value T ′ ″ temporarily set is different from the already set determination threshold value T as a result of the determination of (S444 in FIG. 4), the temporarily set determination threshold value (a3-b3) Although a different discrimination threshold (a3-b3 / 2) is newly set in (S424 in FIG. 4), the present embodiment is not limited to this. The temporarily set discrimination threshold (a3-b3) may be newly set in (S424 in FIG. 4).

  On the other hand, as a result of the determination in (S444 of FIG. 4), when the temporarily set determination threshold is the same as the already set determination threshold, the parameter after performing the integrated average is the same as the parameter before performing the integrated average. Since they are the same, the discrimination threshold T ′ ″ = a1-b1.

  Next, the discrimination threshold control unit 134 increases the discrimination threshold T (= T ′ ″) to obtain the discrimination threshold T ′, and resets the threshold T ′ (S450 in FIG. 4). Here, in the discrimination threshold control unit 134, the updated count number “1” is substituted into the function, and the discrimination threshold set by the discrimination threshold control unit 134 is changed according to the count number of the integration counter 135. Therefore, when the count number is “1”, the determination threshold T ′ = a1−b1 / 2. Note that the discrimination threshold increases as n (the number of counts) increases, and the discrimination threshold finally converges to a1.

  Next, the comparison unit 133 re-compares the value indicating the distance L ′ with the discrimination threshold T ′ (S460 in FIG. 4).

  As a result of the re-comparison by the comparison unit 133 (S460 in FIG. 4), if the value indicating the distance L ′ is equal to or smaller than the determination threshold T ′, the closest object is identified (S470 in FIG. 4). When the object is specified recently, the object specifying signal sending unit 136 outputs a specifying signal to the main system control unit 223 of the display unit 200. The main system control unit 223 performs predetermined processing according to the specific signal.

  As a result of the re-comparison by the comparison unit 133 (S460 in FIG. 4), when the value indicating the distance L ′ is larger than the discrimination threshold T ′, further acquisition of touch position data and integration average (S440 in FIG. 4), Re-extraction and determination (S442 in FIG. 4), provisional setting and determination of the discrimination threshold (S444 in FIG. 4), increase and reset of the discrimination threshold (S450 in FIG. 4), and re-comparison (S460 in FIG. 4) are repeated. . In the integration counter 135, the integration average unit 131 performs integration averaging and updates the count number one by one. As the count number increases, that is, as the averaging is repeated, the influence of external noise is reduced, and the position indicated by the touch position data converges to a predetermined position.

  In the re-comparison when such repetition is performed (S460 in FIG. 4), the distance between the position indicated by the touch position data obtained by the integration averaging and the position of the representative point of the nearest object increases. If the value is equal to or lower than the determined threshold value, the target object is identified recently (S470 in FIG. 4). Here, when the discrimination threshold is set by the function described above, the discrimination threshold converges to a1 after a time of about 0.1 seconds to 1 second has elapsed after the operator touches the touch panel 110 with a finger. In this manner, the time for performing one integration average and the repetition cycle may be set. When the object is recently identified (S470 in FIG. 4), the count number and the discrimination threshold are reset.

  Further, once the operator's finger is released from the touch panel 110, the count number and the discrimination threshold may be reset and set so as to return to (S420 in FIG. 4).

  In the comparison (S430 in FIG. 4) or re-comparison (S460 in FIG. 4), a value indicating the distance L or L ′ between the position indicated by the touch position data and the position of the representative point of the closest object When the value indicating the distance L or L ′ is larger than the determination threshold value T1 by comparing with another determination threshold value T1, that is, the position indicated by the touch position data is greatly separated from the position of the representative point of the object. In this case, the touch position data may be ignored as unnecessary data, and the process may return to (S420 in FIG. 2). In this case, it is possible to prevent unnecessary processing from being performed.

  As described above, according to the touch input device 100 of the present embodiment, when the accuracy of the touch position data is low, a signal indicating that an object has been specified recently is output in order to prevent erroneous determination. If the condition is set to be relatively strict and it can be said that the object has been touched reliably recently, it is determined in a short time that the object has been touched recently, preventing a decrease in responsiveness. Does not determine that the object has been touched recently, and prevents an erroneous determination that the object has been touched recently. In addition, when the accuracy of the touch position data is high, the condition is relaxed to prevent an erroneous determination while preventing a decrease in operability.

  In the above description, until the value indicating the distance between “the position indicated by the touch position data subjected to integration averaging” and “the position of the representative point of the target object” is equal to or less than the determination threshold T ′. (I.e., until an object is specified), integrated average of touch position data (S440 in FIGS. 2 and 4), re-extraction and determination of recent object (S442 in FIG. 4), provisional setting and determination of determination threshold (S444 in FIG. 4), increase and resetting of the discrimination threshold (S450 in FIGS. 2 and 4), and re-comparison (S460 in FIGS. 2 and 4) were repeated, but this embodiment is not limited to this. The upper limit of the number of times (that is, the count number n) at which the integration average (S440) of the touch position data is performed may be determined in advance. Alternatively, in the first recomparison (S460), when the value indicating the distance L ′ is greater than the determination threshold value T, it is determined that the object has not been touched and waits until the operator touches the touch panel 110 again. May be.

  In the above description, the latest object is re-extracted after the integration average (S442 in FIG. 4), but the re-extraction of the latest object after the integration average may be omitted. For example, if the icons are located relatively far apart, the nearest object after the running average will not be different from the nearest object before the running average without re-extracting the nearest object after the running average. The re-extraction of the recent object after the integration average can be omitted.

  In the above description, the determination threshold is temporarily set after the integration average (S444 in FIG. 4), but the determination threshold temporary setting after the integration average may be omitted. For example, if the parameters are the same for the same object, that is, if the discrimination threshold is the same, the discrimination threshold after the integration average does not change from the discrimination threshold before the integration average even if the discrimination threshold is temporarily set. Therefore, provisional setting of the discrimination threshold after the integration average can be omitted.

  When the recent object re-extraction (S442 in FIG. 4) and the temporary setting of the discrimination threshold (S444 in FIG. 4) are omitted, the integration averaging unit 131 calculates the distance after the integration averaging of the touch position data. The unit 132 recalculates the distance L ′ between the position indicated by the touch position data subjected to the integration average and the position of the representative point of the nearest object already extracted (S440 in FIG. 4). The subsequent operation procedure is the same as that described above.

  In the above description, the display unit 210 has a display resolution of wide VGA (800 × 480 pixels), but the present embodiment is not limited to this. The display unit 210 has a resolution of general-purpose QVGA (320 × 240 pixels), wide QVGA (400 × 240 pixels), VGA (640 × 480 pixels), SVGA (800 × 600 pixels), XGA (1024 × 768 pixels), etc. Resolution may be used.

  In the above description, a capacitively coupled touch panel is used as the touch panel 110, but the present embodiment is not limited to this. As the touch panel 110, another type of touch panel such as a resistive film type, an optical type, an electromagnetic induction type, or an ultrasonic surface acoustic wave (SAW) type may be used. For example, when an optical or electromagnetic induction type touch panel is used as the touch panel 110, the touch position data acquisition unit 120 can acquire touch position data by being indirectly touched even if the touch panel 110 is not directly touched. it can.

  In the above description, the display unit 210 is a liquid crystal display element, but the display unit 210 may be an arbitrary display element. In the above description, the touch panel 110 is touched with a finger, but the touch panel 110 may be touched with something other than a finger, for example, a stylus.

  Further, in the above description, based on the result of measuring the current flowing through the terminal electrode (not shown) of the touch panel 110 for the same time as the time previously required to acquire the touch position data when performing the integration averaging. Although the touch position data is acquired, the present embodiment is not limited to this.

  In the above description, the discrimination threshold T ′ is a function of the count number “n”, that is, the number of times of integration averaging, but the present embodiment is not limited to this.

  In the above description, the display control unit 220 that controls the display unit 210 is a component of the display unit 200, but the present embodiment is not limited to this. The display control unit 220 that controls the display unit 210 may be a component of the touch input device 100.

  As described above, according to the touch input device 100 of the present embodiment, it is possible to prevent an object from being specified erroneously while preventing a decrease in responsiveness and operability.

(Embodiment 2)
Hereinafter, a touch input device according to a second embodiment of the present invention and a display device including the touch input device will be described.

  The display device 300 of the present embodiment has the same configuration as the display device of the first embodiment described with reference to FIGS. 1 and 3, and redundant description is omitted to avoid redundancy.

  In the touch input device 100 of the present embodiment, the control unit 130 calculates the distance between the position indicated by the touch position data and the position of the representative point of each object, and the shortest distance (shortest distance) among the distances. Distance) and the second shortest distance are specified, and the object corresponding to the shortest distance (the closest object) and the object corresponding to the second closest distance are specified from the plurality of objects. In the following description, the shortest distance is referred to as a distance L1, the second shortest distance is referred to as a distance L2, and an object corresponding to the shortest distance (most recent object) is referred to as a first object, with the second closest distance. The corresponding object is referred to as a second object. The control unit 130 also calculates a distance difference between the distance L2 and the distance L1. In the following description, this distance difference is referred to as a difference D.

  A discrimination threshold T is preset in the control unit 130, and the control unit 130 compares the discrimination threshold T with a value indicating the difference D between the distance L2 and the distance L1. The first object is specified based on the comparison result.

  Specifically, when the value indicating the difference D is equal to or greater than the determination threshold T as a result of the comparison, the first object is specified.

  On the other hand, as a result of the comparison, when the value indicating the difference D is smaller than the determination threshold value T, no target object is specified. In this case, the touch position data acquisition unit 120 further acquires touch position data, and the control unit 130 performs an average of the touch position data. Accurate touch position data is acquired by performing the averaging. Next, the control unit 130 determines the distance (referred to as distance L1 ′ in the following description) between the position indicated by the touch position data subjected to the integration average and the position of the representative point of the first object. The distance (referred to as distance L2 ′ in the following description) between the position indicated by the touch position data subjected to the integration average and the position of the representative point of the second object is recalculated, and the distance L2 ′ and the distance are calculated. Recalculate the difference from L1 ′. In the following description, this difference is referred to as a difference D '.

  The control unit 130 also decreases the determination threshold value T. In the following description, the discrimination threshold obtained by decreasing the discrimination threshold T is referred to as a discrimination threshold T ′.

  Next, the control unit 130 re-compares the value indicating the difference D ′ with the determination threshold T ′. As a result of the re-comparison, when the value indicating the difference D ′ is greater than or equal to the determination threshold T ′, the first object is specified. When the first object is specified, the control unit 130 performs the following process. For example, the display control unit 220 causes the display unit 210 to display the next screen according to an instruction from the control unit 130.

  Hereinafter, an operation procedure of the display device 300 according to the present embodiment will be described with reference to FIGS. 3 and 5.

  Under the control of the main system control unit 223, the display screen drawing unit 221 displays the target object such that the position of the representative point of the target object is the position indicated by the representative point position data on the display surface of the display unit 210.

  The representative point position data indicating the position of the representative point of each object is stored in the object data storage unit 222, and the distance calculation unit 132 receives the representative point position data from the object data storage unit 222 (FIG. 5). S410).

  When the touch panel 110 is touched, the touch position data acquisition unit 120 acquires touch position data indicating the touched position of the touch panel 110 (S420 in FIG. 5). On the other hand, if the touch panel 110 is not touched, the touch position data acquisition unit 120 cannot acquire the touch position data and waits until the touch panel 110 is touched.

  When the touch position data is acquired (S420 in FIG. 5), the distance calculation unit 132 calculates the distance between the position indicated by the touch position data and the position of the representative point of each object, and each distance. The shortest distance L1 (shortest distance) and the second shortest distance L2 are obtained, and a first object corresponding to the distance L1 and a second object corresponding to the distance L2 are extracted from a plurality of objects ( S422 in FIG. Next, the distance calculation unit 132 calculates a difference D between the distance L2 and the distance L1.

  The discrimination threshold control unit 134 sets the discrimination threshold T (S424 in FIG. 5). The discrimination threshold T is set to a relatively large value in order to prevent an erroneous determination that the first object has been specified.

  Similar to the touch input device of the first embodiment described above, the determination threshold value may be set by a function of a count value of integrated average and a parameter. The function is, for example, (a + b / (n + 1)) or (a + b / √ (n + 1)) (where n is the count number of the integrated average). Of course, other functions may be used. Note that the values of the parameters a and b are set similarly to the case of the first embodiment described above.

  The parameter is a parameter determined by the discrimination threshold control unit 134 according to the position indicated by the touch position data. The value of the parameter may be different depending on the first and second objects, for example, and may be different depending on the position indicated by the touch position data even if the first and second objects are the same. May be. For example, when the first and second objects have anisotropic shapes, or when the arrangement directions of the first and second objects with respect to the position indicated by the touch position data are different, the parameter The values may be different.

  The comparison unit 133 compares the value indicating the difference D with the discrimination threshold T (S430 in FIG. 5).

  As a result of the comparison by the comparison unit 133 (S430 in FIG. 5), when the value indicating the difference D is equal to or greater than the determination threshold T, that is, when the difference D between the distance L2 and the distance L1 is relatively large, the first object is It is specified (S470 in FIG. 5).

  Thus, if the value indicating the difference D between the distance L2 and the distance L1 is equal to or greater than the determination threshold T, the position indicated by the touch position data is surely closer to the first object than the second object. In addition, since it can be said that the first object is touched instead of the second object, the first object can be specified in a short time while preventing erroneous specification.

  A specific signal corresponding to the target is set in the target specific signal sending unit 136, and when the first target is specified (S470 in FIG. 5), the target specific signal sending unit 136 displays the display unit 200. A specific signal corresponding to the first object is output to the main system control unit 223. The main system control unit 223 performs predetermined processing according to the specific signal.

  On the other hand, as a result of the comparison by the comparison unit 133 (S430 in FIG. 5), when the value indicating the difference D is smaller than the discrimination threshold T, that is, when the difference D between the distance L2 and the distance L1 is relatively small, any target Things are not specified. This is because the operator may have selected (touched) the second object in consideration of the influence of external noise. In this case, the object identification signal sending unit 136 may output a signal indicating that the object has not been determined or a signal indicating that the identification of the object has been reserved to the main system control unit 223. .

  If no target object is specified, the touch position data acquisition unit 120 further acquires touch position data, and the integration average unit 131 performs integration average of the touch position data (S440 in FIG. 5). By performing the integration averaging of the touch position data in this way, the influence of external noise is reduced and the accuracy of the touch position data is improved. When the integration averaging is performed (S440 in FIG. 5), the integration counter 135 updates the count number from “0” to “1”. However, the updated count value is substituted into the function in the discrimination threshold control unit 134 when a discrimination threshold is newly set in S424 described later and when the discrimination threshold is reset in S450.

  As described above, the first and second objects are already extracted by calculating the first and second distances in (S422 in FIG. 5). For example, the objects are arranged relatively adjacent to each other. When the middle point of two or three or more objects is touched, the first and second objects already extracted due to the influence of external noise are indicated by the touch-averaged data of the integrated average. The first object closest to the position to be moved and the second object closest to the second position may be different. At this time, the order of proximity of the objects ordered in (S422 in FIG. 5) is switched.

  Therefore, after the integration average unit 131 performs the integration average of the touch position data, the distance calculation unit 132 is the most of the distances between the position indicated by the integration average value and the positions of the representative points of the plurality of objects. The first distance that is a short distance and the second distance that is the second shortest distance are recalculated, and the distance difference between the recalculated second distance and the first distance is recalculated. In addition, first and second objects corresponding to the recalculated first and second distances are extracted from the plurality of objects. In the following description, the recalculated first distance is also referred to as distance L1 ′, the recalculated second distance is also referred to as distance L2 ′, and the recalculated distance difference is also referred to as difference D ′. The distances L1 ′ and L2 The object corresponding to 'is also referred to as a re-extracted first and second object.

  The distance calculation unit 132 may perform recalculation of distances for all objects, or, as described above, objects existing in a block including the position indicated by the integrated average value and a block adjacent to the block. The distance may be recalculated only for objects. Alternatively, when the display unit 210 displays a keyboard, two of the objects that are considered to be close to the fourth in the first calculation can be the first and second objects after integration averaging. Since the performance is high, the distance calculation unit 132 may recalculate only the distance for the object that is considered to be close to the fourth.

  Next, it is determined whether the re-extracted first and second objects are the same as the extracted first and second objects (S442 in FIG. 5).

  As described above, since the discrimination threshold may differ depending on the object, the re-extracted first and second objects are re-extracted if they are different from the first and second objects already extracted. It is necessary to use a discrimination threshold corresponding to the first and second objects.

  Therefore, as a result of the determination in (S442 in FIG. 5), when the re-extracted first and second objects are different from the extracted first and second objects, the discrimination threshold control unit 134 is re-extracted. The discrimination threshold T ″ is newly set based on the first and second objects (S424 in FIG. 5), and the comparison unit 133 compares the recalculated difference D ′ with the discrimination threshold T ″ ( S430 in FIG.

  As a result of the comparison by the comparison unit 133 (S530 in FIG. 5), if the recalculated difference D ′ is greater than or equal to the discrimination threshold T ″, the re-extracted first object is specified (S470 in FIG. 5). . In this case, the object specifying signal sending unit 136 outputs a signal indicating that the first object is re-extracted and specified to the main system control unit 223.

  Note that, as a result of the comparison by the comparison unit 133 (S430 in FIG. 5), if the recalculated difference D ′ is smaller than the determination threshold T ″, further acquisition of touch position data and an integrated average (S440 in FIG. 5) again. ) And re-extraction and determination of the first and second objects (S442 in FIG. 5).

  On the other hand, as a result of the determination in (S442 in FIG. 5), when the re-extracted first and second objects are the same as the first and second objects already extracted, the determination threshold value control unit 134 is the same. A discrimination threshold T ′ ″ is provisionally set for the first and second objects (S444 in FIG. 5). The discrimination threshold is provisionally set based on a parameter determined by the position indicated by the re-extracted first and second objects and the integrated average value. When the function is used, the count number is “1” as described above, but the updated count number is not yet assigned to the function.

  Next, it is determined whether or not the temporarily set determination threshold value T ′ ″ is the same as the already set determination threshold value T (S444 in FIG. 5).

  As described above, the determination threshold is, for example, when at least one of the first and second objects has an anisotropic shape, or adjacent only in the direction in which the first and second objects are present. In the case of being arranged, the determination threshold when the position indicated by the touch position data is in the direction connecting the representative points of the two objects may be different from the determination threshold when the position is in another direction. When the temporarily set discrimination threshold is different from the already set discrimination threshold, it is necessary to set the discrimination threshold corresponding to the position indicated by the integrated average value.

  Therefore, if the temporarily determined discrimination threshold T ′ ″ is different from the already set discrimination threshold T as a result of the determination of (S444 in FIG. 5), the parameters after the integration averaging are the same as those before the integration averaging is performed. It is different from the parameter.

  Next, the discrimination threshold control unit 134 newly sets a discrimination threshold T ′ ″ based on a function of the parameter determined by the position indicated by the cumulative average value and the number of times of performing the cumulative average (FIG. 5). S424).

  As a result of the comparison by the comparison unit 133 (S430 in FIG. 5), when the recalculated difference D ′ is equal to or larger than the newly set discrimination threshold T ″ ′, the extracted first object is specified ( S470 in FIG. In this case, the object specifying signal sending unit 136 outputs a signal indicating that the re-extracted first object is specified to the main system control unit 223.

  In addition, when the recalculated difference D ′ is smaller than the newly set discrimination threshold T ′ ″ as a result of the comparison by the comparison unit 133 (S430 in FIG. 5), the touch position data is further acquired and integrated again. Average (S440 in FIG. 5), re-extraction and determination of the first and second objects (S442 in FIG. 5), and provisional setting and determination of the determination threshold (S444 in FIG. 5) are performed.

  Here, when the determination threshold value T ′ ″ provisionally set is different from the already set determination threshold value T as a result of the determination in (S444 in FIG. 5), a determination threshold value different from the temporarily set determination threshold value is obtained. Although newly set in (S424 in FIG. 5), the present embodiment is not limited to this. The temporarily set discrimination threshold value may be newly set in (S424 in FIG. 5).

  On the other hand, as a result of the determination of (S444 in FIG. 5), when the temporarily set determination threshold is the same as the already set determination threshold, the parameter after the integration average is the same as the parameter before the integration average. The same. In this way, when the temporarily set discrimination threshold is the same as the already set discrimination threshold, the discrimination threshold control unit 134 decreases the discrimination threshold T to obtain the discrimination threshold T ′, and resets the threshold T ′. This is set (S450 in FIG. 5). The discrimination threshold set by the discrimination threshold control unit 134 may be changed according to the count number of the integration counter 135.

  Next, the comparison unit 133 re-compares the value indicating the difference D ′ with the determination threshold T ′ (S460 in FIG. 5).

  As a result of the recomparison by the comparison unit 133 (S460 in FIG. 5), when the value indicating the difference D ′ is greater than or equal to the discrimination threshold T ′, that is, when the difference D ′ between the distance L2 ′ and the distance L1 ′ is relatively large. The first object is specified (S470 in FIG. 5).

  As described above, by using the highly accurate touch position data and the decreased determination threshold value T ′, it is possible to prevent the operability from being deteriorated while preventing erroneous determination.

  When the first object is specified (S470 in FIG. 5), the object specifying signal sending unit 136 outputs a specifying signal corresponding to the first object to the main system control unit 223 of the display unit 200. The main system control unit 223 performs predetermined processing according to the specific signal.

  On the other hand, as a result of the recomparison by the comparison unit 133 (S460 in FIG. 5), when the value indicating the difference D ′ is smaller than the discrimination threshold T ′, that is, the difference D ′ between the distance L2 ′ and the distance L1 ′ is relatively small. If it is small, no object is identified. Accumulated average of touch position data (S440 in FIG. 5), re-extraction and determination of the first and second objects (S442 in FIG. 5), provisional setting and determination of a discrimination threshold (S444 in FIG. 5), and reduction of the discrimination threshold And resetting (S450 in FIG. 5) and re-comparison (S460 in FIG. 5) are repeated. In the integration counter 135, the integration average unit 131 performs integration averaging and updates the count number one by one. In the re-comparison when the repetition is performed (S460 in FIG. 5), “the distance between the position indicated by the touch position data subjected to the integrated averaging and the position of the representative point of the second object” and “ If the difference between the “distance between the position indicated by the touch position data subjected to the integrated average and the position of the representative point of the first object” is equal to or greater than the reduced determination threshold T ′, the first object Is identified (S470 in FIG. 5). When the first object is specified (S470 in FIG. 5), the count number and the discrimination threshold T ′ are reset.

  Further, once the operator's finger is released from the touch panel 110, the count number and the discrimination threshold T ′ may be reset and returned to (S420 in FIG. 5).

  Note that another discrimination threshold T2 may be set in advance in the discrimination threshold control unit 134, and the distance calculation unit 132 may compare a value indicating the distance L1 with another discrimination threshold T2. As a result of the comparison, when the value indicating the distance L1 is larger than the determination threshold value T2, even the first object closest to the position indicated by the touch position data is relatively far from the position indicated by the touch position data. Therefore, the identification of the object may be stopped.

  Similarly, the value indicating the distance L1 ′ may be re-compared with the determination threshold value T2, and the determination of which of the plurality of objects is touched based on the result of the re-comparison may be stopped. Good. Alternatively, the value indicating the distance L1 'may be re-compared with the discrimination threshold T2' obtained by increasing the discrimination threshold T2, and the identification of the object may be stopped based on the result of the re-comparison.

  In the above description, “the distance between the position indicated by the touch position data and the position of the representative point of the second object” and “the position indicated by the touch position data and the representative point of the first object”. Until the difference from the “distance between the first position and the second position” becomes equal to or greater than the decreased determination threshold T ′, S440 in FIG. 5, re-extraction and determination of the first and second objects (S442 in FIG. 5). ), Provisional setting and determination of the discrimination threshold (S444 in FIG. 5), reduction and resetting of the discrimination threshold (S450 in FIG. 5), and re-comparison (S460 in FIG. 5) were repeated. It is not limited to. The number of times of performing the integration average (S440 in FIG. 5), that is, the upper limit of the count number of the integration counter 135 may be determined in advance.

  Alternatively, in the first recomparison (S460 in FIG. 5), when the difference D ′ is smaller than the determination threshold T ′, it is determined that no object is touched, and the operator touches the touch panel 110 again. You may wait until you touch.

  In the above description, the first and second objects are re-extracted after the integration average (S442 in FIG. 5), but the re-extraction of the first and second objects after the integration average is omitted. May be.

  For example, the distance L3 ′ between the position indicated by the touch position data and the position of the representative point of the third object is clearly larger than the distance L2 ′ described above, for example, (L2′−L1 ′) <( L3′−L2 ′), and if the current third object is very unlikely to be finally determined as the first object, the first and second objects may be Even if it is not extracted, the first and second objects after the integration average do not change from the first and second objects before the integration average, so that the first and second objects after the integration average are not Extraction can be omitted.

  In the above description, the determination threshold is provisionally set after the integration average (S444 in FIG. 5), but the determination threshold provisional after the integration average may be omitted. For example, if the parameters are the same if the first and second objects are the same, that is, if the discrimination threshold is the same, the discrimination threshold after the integration average is the Since it is not different from the discrimination threshold, provisional setting of the discrimination threshold after the integration average can be omitted.

  When the re-extraction of the first and second objects (S442 in FIG. 5) and the temporary setting of the discrimination threshold (S444 in FIG. 5) are omitted, the integration average unit 131 performs the integration average of the touch position data. After that, the distance calculation unit 132 has the distance L2 ′ between the position indicated by the integrated average value and the position of the representative point of the second object already extracted, and the first position already extracted from the position indicated by the integrated average value. The distance L1 ′ from the position of the representative point of the object and the difference D ′ between the distance L2 ′ and the distance L1 ′ are recalculated (S440 in FIG. 5). The subsequent operation procedure is the same as that described above.

(Determination threshold setting method)
In the touch input devices according to the first and second embodiments described above, the discrimination threshold (initial value) T is set in advance for the object to be displayed, and the discrimination threshold is changed every time the touch position data is integrated and averaged. Although an example is shown, the present invention is not limited to this.

  Hereinafter, another example of the determination threshold setting method in the touch input device according to the present invention will be described.

  As the touch panel 110, a capacitive coupling type touch panel is used. An example of a preferred capacitive coupling type touch panel is disclosed in Japanese Patent Application Nos. 2004-308533 and 2004-308534 by the present applicant, but other capacitive coupling type touch panels can also be used. .

  As illustrated in FIG. 6, the touch panel 110 includes a position-detecting transparent conductive film (hereinafter simply referred to as a transparent conductive film) 111 and terminal electrodes 112 provided at four corners of the transparent conductive film 111. The touch panel 110 may further include a protective layer (not shown) that protects the transparent conductive film. The touch position data acquisition unit 120 applies an alternating voltage of the same homogenous amplitude to the terminal electrode, and the in-plane of the transparent conductive film 111 is kept substantially equipotential.

  When the operator directly or indirectly touches the transparent conductive film 111 with a finger or a pen, the transparent conductive film 111 is capacitively coupled to the ground (ground plane). The capacitance is a combination of the capacitance between the protective layer and the transparent conductive film 111 and the impedance existing between the operator and the ground.

  The electrical resistance value of the transparent conductive film 111 between the capacitively coupled contact portion and each terminal electrode 112 is approximately proportional to the distance between the contact portion and each terminal electrode 112. Therefore, a current approximately inversely proportional to the distance between the contact portion and each terminal electrode 112 flows through the electrodes at the four corners of the transparent conductive film 111.

When the transparent conductive film 111 is directly touched, currents flowing through the terminal electrodes 112 are i ₁ , i ₂ , i ₃ , and i ₄ (see FIG. 6). Here, for the sake of simplicity, it is assumed that no current flows when no contact point is formed on the transparent conductive film 111. However, as will be described later, when the transparent conductive film 111 is not actually touched, as will be described later. Since the current flows through the stray capacitance, in order to acquire the touch position data, it is necessary to obtain the change amount (increase amount) of the current due to the touch of the transparent conductive film 111.

  The position indicated by the touch position data is represented by two-dimensional coordinates, and the X coordinate and the Y coordinate can be determined based on, for example, the following equations.

X = k ₁ + k ₂ · (i ₂ + i ₃ ) / (i ₁ + i ₂ + i ₃ + i ₄ ) (Formula 1)
Y = k ₁ + k ₂ · (i ₁ + i ₂ ) / (i ₁ + i ₂ + i ₃ + i ₄ ) (Formula 2)

  Further, the following calculation formula may be used.

X = k ₁ + k ₂ · [i ₂ / (i ₂ + i ₄ ) + i ₃ / (i ₁ + i ₃ )] (Formula 3)
Y = k ₁ + k _2. [I ₁ / (i ₁ + i ₃ ) + i ₂ / (i ₂ + i ₄ )] (Formula 4)

Here, X is the X coordinate of the position indicated by the touch position data, and Y is the Y coordinate of the position indicated by the touch position data. K ₁ is an offset (0 when the output coordinate is the origin), and k ₂ is a magnification. k ₁ and k ₂ are constants that do not depend on the impedance of the operator.

  The touch position data acquisition unit 120 acquires the touch position data indicating the touch position by measuring the magnitudes of these currents and obtaining the relative ratio of the current magnitudes. Actually, since the current flows through the stray capacitance even when the transparent conductive film 111 is not touched, strictly speaking, the terminal electrode 112 that changes according to the touch of the transparent conductive film 111 is provided. Touch position data is acquired according to the amount of change (increase) in the flowing current.

  Note that, in general, when a resistive film type touch panel is used as the touch panel 110, the position detection accuracy does not change if the touch panel 110 is touched with a certain pressure or more, but a capacitive coupling type touch panel is used as the touch panel 110. When touching with a finger, particularly with a finger, the capacitance, that is, the sum of the amount of change in the current flowing through the terminal electrode 112 (signal intensity) changes according to the contact area. The larger the contact area, the larger the sum of changes in current (the influence of external noise is reduced), and the accuracy of touch position data is improved.

  Therefore, in the capacitively coupled touch panel 110, the sum of the amount of change in the current flowing through the terminal electrode 112 can be used as an index of the accuracy of the touch position data. That is, when the sum of the amount of change in the current flowing through the terminal electrode 112 is large, the signal-to-noise ratio of the signal indicating the current flowing through the terminal electrode 112 is good, thereby obtaining highly accurate touch position data.

  On the other hand, when the sum of the amount of change in the current flowing through the terminal electrode 112 is small, the signal-to-noise ratio of the signal indicating the current flowing through the terminal electrode 112 is poor and is easily affected by external noise. To be acquired.

  In the touch input device 100 of this embodiment, the discrimination threshold control unit 134 sets the discrimination threshold (initial value) T according to the sum of the amount of change in the current flowing through each of the terminal electrodes 112. Specifically, in the case of the touch input device according to the first embodiment, the discrimination threshold control unit 134 sets a larger value as the discrimination threshold (initial value) T as the sum of the current change amounts is larger. On the other hand, in the case of the touch input device according to the second embodiment, the discrimination threshold control unit 134 sets a smaller value as the discrimination threshold (initial value) T as the sum of the current change amounts is larger. Of course, the magnitude (change amount) of the discrimination threshold that is increased or decreased according to the number of times of integration averaging may also be changed according to the sum of the current change amounts.

  By setting the discrimination threshold T in this way, when the amount of change in current is large, that is, when the position detection accuracy is high, the target is specified earlier, and when the detection accuracy is low, the integrated average is obtained until a sufficient detection system is obtained. Is repeated. Accordingly, the operability of the touch input device 100 can be improved by setting and changing the discrimination threshold T in this way.

  As described above, according to the touch input device of the embodiment of the present invention, it is possible to prevent an erroneous determination from being made while preventing the operability of the touch input device from being deteriorated.

  Note that the components included in the control unit 130 of the touch input device 100 according to the first and second embodiments described above, that is, the integration average unit 131, the distance calculation unit 132, the comparison unit 133, the discrimination threshold control unit 134, and the integration counter 135 are included. The object specifying signal transmission unit 136 can be realized by hardware, and a part or all of these can also be realized by software.

  When these components are realized by software, they may be configured using a computer. This computer includes a CPU (central processing unit) for executing various programs and a work area for executing these programs. RAM (random access memory) functioning as And the program for implement | achieving the function of each component is run in a computer, and this computer is operated as each component.

  Further, the program may be supplied from the recording medium to the computer, or may be supplied to the computer via a communication network.

The recording medium may be configured to be separable from the computer or may be incorporated in the computer. Even if this recording medium is mounted on the computer so that the recorded program code can be directly read by the computer, it can be read via a program reading device connected to the computer as an external storage device. It may be attached to.

  Examples of the recording medium include tapes such as magnetic tapes and cassette tapes: magnetic disks such as flexible disks / hard disks, magneto-optical disks such as MO and MD, and disks including optical disks such as CD-ROM, DVD and CD-R: IC cards (including memory cards), optical cards and other cards: or semiconductors such as mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), semiconductors such as flash ROM it can.

  When a program is supplied via a communication network, the program takes the form of a data signal in which the program code is embodied by electronic transmission.

  The touch input device of the present invention is suitable for a system for inputting data at an ATM (automatic cash dispenser) of a bank, a ticket vending machine of public transport such as a railroad, an information terminal such as a geographic guidance system, etc. Used for.

It is a block diagram which shows the structure of 1st Embodiment of the display apparatus by this invention. It is a flowchart for demonstrating 1st Embodiment of the operation | movement procedure of the display apparatus by this invention. It is a block diagram which shows the more concrete structure of embodiment of the display apparatus by this invention. It is a flowchart for demonstrating the operation | movement procedure of 1st Embodiment of the display apparatus by this invention. It is a flowchart for demonstrating the operation | movement procedure of 2nd Embodiment of the display apparatus by this invention. It is a schematic diagram which shows the electrostatic capacitance type touch panel in embodiment of the touch input device by this invention. In the conventional display apparatus, it is a schematic diagram which shows the relationship between the touch position which is the position actually touched of the touch panel, and the position shown by the touch position data, (a) shows the icon arrange | positioned adjacently. It is a schematic diagram, (b) is the schematic diagram which expanded (a). In the conventional display apparatus, it is a schematic diagram which shows the relationship between the touch position which is the position where the touch panel was actually touched, and the position shown by the touch position data.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Touch input device 110 Touch panel 111 Transparent conductive film 112 Terminal electrode 120 Touch position data acquisition part 130 Control part 131 Accumulation average part 132 Distance calculation part 133 Discrimination threshold value determination part 134 Integration counter part 135 Discrimination threshold value control part 136 Target object specific signal transmission Unit 200 display unit 210 display unit 220 display control unit 221 display screen drawing unit 222 object data storage unit 223 main system control unit

Claims (16)

A touch panel used by being attached to a display surface of a display unit capable of displaying a plurality of objects, touch position data acquisition means for acquiring touch position data indicating a position where the touch panel is touched directly or indirectly, and control means A touch input device comprising:
The control means includes
Representative point position data indicating the positions of representative points of the plurality of objects displayed on the display surface is received, and indicated by the position indicated by the touch position data and the representative point position data of the plurality of objects. Distance calculation means for calculating at least the shortest distance among the distances to the positions of the representative points, and extracting one object corresponding to the shortest distance from the plurality of objects;
A discrimination threshold control means for setting a discrimination threshold;
Comparing means for comparing the shortest distance obtained by the distance calculating means with the discrimination threshold set by the discrimination threshold control means,
When the comparison result by the comparison means indicates that the shortest distance is equal to or smaller than the determination threshold, a signal indicating that the extracted object is specified is output;
When the comparison result by the comparison means indicates that the shortest distance is larger than the determination threshold value, the touch position data means further acquires touch position data, and obtains an integrated average value of the already acquired touch position data. The threshold control means increases the discrimination threshold, and the distance calculation means indicates the position indicated by the integrated average value and the representative point position indicated by the representative point position data of the one extracted object. And re-compare the value indicating the distance recalculated by the comparison means with the increased discrimination threshold, and the re-comparison result is obtained by increasing the re-calculated distance. A touch input device that outputs a signal indicating that the extracted object has been identified when it is equal to or smaller than the discrimination threshold.   When the control means does not output a signal indicating that the extracted object is specified by the re-comparison result, the touch position data means further obtains touch position data, and an integrated average of the touch position data The touch input device according to claim 1, wherein the increase of the discrimination threshold and the re-comparison are further repeated.   The touch input device according to claim 1, wherein the discrimination threshold control unit increases the discrimination threshold based on the number of times of performing the integration average. The touch panel has a transparent conductive film and a plurality of terminal electrodes provided on the transparent conductive film,
The touch position data acquisition means applies a voltage to the plurality of terminal electrodes, and the current flowing through each of the plurality of terminal electrodes changed by directly or indirectly touching the transparent conductive film of the touch panel. Measure the amount of change, obtain the touch position data based on the amount of change,
4. The touch input device according to claim 1, wherein the discrimination threshold control unit sets the discrimination threshold according to a sum of change amounts of currents flowing through the plurality of terminal electrodes. 5.   5. The touch input device according to claim 1, wherein the determination threshold value is different according to a direction connecting a position indicated by the touch position data and a position of a representative point of the one object. The control means includes
Recalculating at least the shortest distance among the distances between the position indicated by the integrated average value and the representative point position indicated by the representative point position data of the plurality of objects by the distance calculating means; Re-extract one object corresponding to the recalculated shortest distance from the object, determine whether the re-extracted object is the same as the already extracted object;
When the re-extracted object is the same as the already extracted object, a determination threshold value is provisionally set by the determination threshold value control means, and the temporarily set determination threshold value is the same as the already set determination threshold value. Determine if there is
When the temporarily set discrimination threshold is the same as the already set discrimination threshold, the discrimination threshold control unit increases the already set discrimination threshold, and the shortest distance recalculated by the comparison unit and the Re-comparison with the increased discrimination threshold and if the re-comparison result indicates that the recalculated shortest distance is less than or equal to the increased discrimination threshold, the extracted object is identified The touch input device according to claim 1, which outputs a signal indicating that. The control means includes
When the re-extracted object is different from the already-extracted object, a new determination threshold is set by the determination threshold control means, and the recalculated shortest distance and the new setting are set by the comparison means. Compared with a discrimination threshold, and if the comparison result indicates that the recalculated shortest distance is equal to or smaller than the newly set discrimination threshold, the re-extracted object is identified. The touch input device according to claim 6, wherein a touch signal is output. The control means includes
When the temporarily set determination threshold is different from the already set determination threshold, the determination threshold control means newly sets the temporarily set determination threshold or is different from the temporarily set determination threshold. Another determination threshold value is newly set, the recalculated shortest distance is compared with the newly set determination threshold value by the comparison means, and the comparison result indicates that the recalculated shortest distance is The touch input device according to claim 6, wherein a signal indicating that the extracted object is specified is output when it is equal to or smaller than a set determination threshold value. A touch panel used by being attached to a display surface of a display unit capable of displaying a plurality of objects, touch position data acquiring means for acquiring touch position data indicating a position where the touch panel is directly or indirectly touched, and control means A touch input device comprising:
The control means includes
Representative point position data indicating the positions of representative points of the plurality of objects displayed on the display surface is received, and indicated by the position indicated by the touch position data and the representative point position data of the plurality of objects. Calculating at least a first distance that is the shortest distance and a second distance that is the second shortest distance between the positions of the representative points and calculating a distance difference between the first distance and the second distance; A distance calculating means for calculating and extracting a first object corresponding to the first distance and a second object corresponding to the second distance among the plurality of objects;
A discrimination threshold control means for setting a discrimination threshold;
Comparing means for comparing the distance difference obtained by the distance calculating means with the discrimination threshold set by the discrimination threshold control means,
If the comparison result by the comparison means indicates that the distance difference is equal to or greater than the determination threshold value, a signal indicating that the first object has been specified is output;
When the comparison result by the comparison means indicates that the distance difference is smaller than the determination threshold, touch position data is further acquired by the touch position data means, and an integrated average value of the already acquired touch position data is obtained. And obtaining the first distance between the position indicated by the integrated average value by the distance calculating means and the position of the representative point of the first object; Recalculating the second distance between the position indicated by the integrated average value and the position of the representative point of the second object, and the distance difference between the first distance and the second distance; Re-compare the recalculated distance difference with the reduced discrimination threshold, and the re-comparison result indicates that the re-calculated distance difference is equal to or greater than the reduced discrimination threshold. And it outputs a signal indicating that the first object is the extracted is identified, the touch input device.   When the control means does not output a signal indicating that the extracted first object is specified by the re-comparison result, the control means further acquires touch position data by the touch position data means, The touch input device according to claim 9, wherein the integration average, the decrease of the determination threshold value, and the re-comparison are further repeated.   The touch input device according to claim 9, wherein the control unit decreases the determination threshold based on the number of times of performing the integration average. The touch panel has a transparent conductive film and a plurality of terminal electrodes provided on the transparent conductive film,
The touch position data acquisition means applies a voltage to the plurality of terminal electrodes, and the current flowing through each of the plurality of terminal electrodes changed by directly or indirectly touching the transparent conductive film of the touch panel. Measure the amount of change, obtain the touch position data based on the amount of change,
The touch input device according to claim 9, wherein the determination threshold value control unit sets the determination threshold value according to a sum of change amounts of currents flowing through the plurality of terminal electrodes.   The touch input device according to claim 9, wherein the determination threshold value varies depending on a direction connecting the position indicated by the touch position data and the position of the representative point of the first object. The control means includes
The first distance and the second distance, which are the shortest distances among the distances between the position indicated by the integrated average value by the distance calculation means and the representative point positions indicated by the representative point position data of the plurality of objects. And recalculating at least the second distance, which is a short distance, and recalculating the distance difference between the recalculated first distance and the recalculated second distance, and recalculating the plurality of objects. The first object corresponding to the first distance and the second object corresponding to the recalculated second distance are re-extracted, and the re-extracted first and second objects are already extracted. 1. Determine if it is the same as the second object,
When the re-extracted first and second objects are the same as the first and second objects already extracted, a discrimination threshold is temporarily set by the discrimination threshold control means, and the temporarily set discrimination threshold Is the same as the threshold value already set,
When the temporarily set discrimination threshold is the same as the already set discrimination threshold, the discrimination threshold control unit decreases the already set discrimination threshold, and the distance difference recalculated by the comparison unit and the Re-comparison with the reduced discrimination threshold and if the re-comparison result indicates that the recalculated distance difference is equal to or greater than the reduced discrimination threshold, the extracted first object is identified The touch input device according to claim 9, which outputs a signal indicating that the operation has been performed. The control means includes
When the re-extracted first and second objects are different from the first and second objects already extracted, a discrimination threshold is newly set by the discrimination threshold control means, and the re-calculation is performed by the comparison means. And the newly set discrimination threshold is compared, and if the comparison result indicates that the recalculated distance difference is equal to or greater than the newly set discrimination threshold, the re-extraction The touch input device according to claim 14, wherein the touch input device outputs a signal indicating that the specified first object has been identified. The control means includes
When the temporarily set determination threshold is different from the already set determination threshold, the determination threshold control means newly sets the temporarily set determination threshold or is different from the temporarily set determination threshold. Another determination threshold value is newly set, the recalculated distance difference is compared with the newly set determination threshold value by the comparison unit, and the comparison result indicates that the recalculated distance difference is the newly calculated distance difference. The touch input device according to claim 14, wherein a signal indicating that the extracted first object is specified is output when it is equal to or greater than a set determination threshold value.

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