JP2017182359A - Touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a touch panel capable of deriving the amount of coordinate shift while usual touch manipulation is being performed thereon.SOLUTION: A touch panel measures variation in capacitance on a touch sensor panel, and detects first coordinates representing a touched position from a measurement result. Second coordinates representing a touched position during a period of a stationary touch are extracted from the detected first coordinates. The amount of coordinate shift is derived from the extracted second coordinates.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a touch panel.

  The touch panel detects that a touch has been performed with an indicator such as a finger and outputs coordinates indicating the touch position where the touch has been performed. The touch panel is attached to a display device or the like provided in the information processing apparatus, and provides the information processing apparatus with an excellent user interface that replaces a mechanical keyboard, a mouse, and the like.

  In a touch panel provided as a product, it is detected that a touch is performed by an indicator by a resistance film method, a capacitance method, or the like.

  The capacitive method includes a projected capacitive touch screen (PCT) method. The technique described in Patent Document 1 is an example. In a PCT touch panel, even when the front surface of a touch sensor panel incorporating a plurality of sensor electrodes is covered with a glass plate having a thickness of about several millimeters, it can be detected that a touch has been performed by an indicator. . For this reason, the PCT touch panel can be provided with excellent robustness by disposing a protective plate on the front surface of the touch sensor panel. Further, the PCT touch panel has a long life because it does not have a movable portion. Due to these advantages, the PCT touch panel is mounted on a display device included in a mobile communication terminal, an automatic teller machine installed in a financial institution, a car navigation device, etc., and constitutes a touch input device. .

  The touch panel is affected by noise radiated from peripheral devices. When the touch panel is affected by noise, the coordinates output from the touch panel fluctuate, and coordinate blurring occurs. For this reason, in the touch panel, a technique for suppressing the shake of coordinates is adopted. The technique described in each of Patent Documents 2 and 3 is an example.

  In the technique described in Patent Document 2, an instruction is issued to the operator to continue touching one point on the touch screen for a predetermined time, the coordinates at the time of the DOWN event are set as a reference point, and a move event occurs. The operating frequency of the touch screen is changed when each of the coordinate difference from the reference point and the MOVE event occurrence frequency exceeds a predetermined value.

  In the technique described in Patent Document 3, a touch coordinate satisfying a predetermined condition is set as a base coordinate, and is calculated when the touch coordinate calculated thereafter is within a jitter suppression area centered on the base coordinate. Touch coordinates are replaced with base coordinates.

JP 2008-134836 A JP-A-9-101862 JP2015-118445A

  In order to appropriately suppress the blurring of coordinates in the conventional touch panel, it is desired to accurately obtain the amount of blurring of coordinates. For example, in the technique described in Patent Document 2, it is desirable to accurately determine the amount of coordinate blur that is the basis for changing the operating frequency of the touch screen. Further, in the technique described in Patent Document 3, as the size of the jitter suppression area is increased, the blurring of the coordinates is suppressed. However, the response of the touch panel is deteriorated as the size of the jitter suppression area is increased. For this reason, in the technique described in Patent Document 3, it is desired to set the size of the jitter suppression elisa to the minimum necessary size according to the amount of coordinate blur. It is desirable to accurately determine the amount of blurring of the coordinates.

  On the other hand, in the conventional touch panel, when the amount of coordinate blur is required, it is necessary to perform a static touch in which the touch position is kept constant. For this reason, a normal touch operation cannot be performed while the amount of coordinate blur is determined. Therefore, in a conventional touch panel, the amount of coordinate blur cannot always be obtained. When the amount of coordinate blur cannot always be obtained, the situation cannot be accurately grasped when the amount of coordinate blur varies depending on the time zone. Also, in the conventional touch panel, if the indicator is moved by mistake while the amount of coordinate blur is being calculated, the change in coordinates resulting from the movement of the indicator is recognized as the coordinate blur. Therefore, the amount of blurring of the coordinates cannot be obtained accurately.

  The present invention is made to solve this problem. The problem to be solved by the present invention is to obtain a blur amount of coordinates while a normal touch operation is being performed on a touch panel. In addition, a problem to be solved by the present invention is to cause the touch panel to output coordinates in which shaking is suppressed while maintaining a good response of the touch panel.

  In the touch panel, a plurality of time-sequential measurement results are acquired by repeatedly measuring a change in capacitance in the touch sensor panel and acquiring the measurement results. A first plurality of coordinates indicating a temporal change in the touch position are detected from the obtained plurality of measurement results. From the detected first plurality of coordinates, a second plurality of coordinates indicating a temporal change in the touch position during a period in which the static touch is performed is extracted. A blur amount of coordinates is calculated from the extracted second plurality of coordinates. The amount of shake of the calculated coordinates is output.

  The parameter value may be determined from the calculated coordinate blur amount, and the process of suppressing the coordinate blur based on the determined parameter value may be performed on the first plurality of coordinates. In this case, a plurality of coordinates in which blurring is suppressed are acquired, and the acquired coordinates are output.

  According to the present invention, on the touch panel, a plurality of coordinates detected in a period during which a stationary touch is performed are extracted from a plurality of coordinates detected when a normal touch operation is performed, and the extracted plurality of coordinates From this, the amount of coordinate blur is calculated. For this reason, in the touch panel, the amount of coordinate blur is determined while a normal touch operation is performed.

  According to some aspects of the present invention, the amount of coordinate blur is reflected in the process of suppressing coordinate blur, and the process of suppressing coordinate blur is performed based on the optimum parameter value corresponding to the amount of coordinate blur. Is called. For this reason, coordinates in which shaking is suppressed while the response of the touch panel is well maintained are output from the touch panel.

It is a block diagram which shows the touchscreen of Embodiment 1, 2, and 3. FIG. It is a flowchart which shows operation | movement of the touchscreen of Embodiment 1, 2, 3, and 4. FIG. 4 is a flowchart showing a single processing operation of the touch panel according to the first and second embodiments. 6 is a diagram illustrating an example of coordinates detected when a stationary touch is performed on the touch panel of Embodiment 1. FIG. 6 is a diagram illustrating an example of coordinates detected when an indicator is moved so as to draw an arc while a touch is being performed on the touch panel of Embodiment 1. FIG. It is a figure which shows the example of the coordinate detected when a stationary touch is performed in the touchscreen of Embodiment 2. FIG. 10 is a flowchart showing one processing operation of the touch panel according to the third embodiment. FIG. 10 is a block diagram illustrating a touch panel according to a fourth embodiment. 10 is a flowchart showing one processing operation of the touch panel according to the fourth embodiment.

1 Embodiment 1
1.1 Touch Panel FIG. 1 is a block diagram illustrating the touch panel according to the first embodiment.

  A touch panel 1000 shown in FIG. 1 includes a touch sensor panel 1012, a sensing unit 1014, a detection unit 1016, an extraction unit 1018, a calculation unit 1020, and an output unit 1022. The touch panel 1000 may include components other than these components.

  The touch panel 1000 outputs a shake amount of coordinates indicating a touch position where a touch with an indicator such as a finger is performed. The touch panel 1000 is preferably used in an information processing apparatus to which a touch input function is added.

  The touch sensor panel 1012 includes a plurality of sensors.

  The sensing unit 1014 measures changes in capacitance in a plurality of sensors provided in the touch sensor panel 1012 and acquires measurement results.

  The detection unit 1016 determines whether or not a touch with a pointer is performed from the acquired measurement result. Further, when the detection unit 1016 determines that the touch by the indicator is performed, the detection unit 1016 detects coordinates indicating the touch position on the touch sensor panel 1042 from the acquired measurement result. The touch position is expressed by a set of X coordinates and Y coordinates in a two-dimensional orthogonal coordinate system. The touch position may be expressed by a combination other than the set of the X coordinate and the Y coordinate in the two-dimensional orthogonal coordinate system. For example, the touch position may be expressed by a coordinate in a one-dimensional coordinate system, or may be expressed by a set of a radius r and a deviation angle θ in a two-dimensional polar coordinate system.

  The extraction unit 1018 stores the detected coordinates, and extracts a plurality of coordinates indicating a temporal change in the touch position during a period in which the stationary touch is performed from the plurality of stored coordinates at a predetermined timing.

  The static touch is a touch in which the touch position is maintained within a certain range, and is performed even during a normal touch operation. For example, when the touch panel 1000 is incorporated in a touch display, a static touch is performed when a displayed button is pressed with an indicator and a touch operation is performed to release the indicator from the displayed button.

  The calculation unit 1020 calculates a blur amount of coordinates from the extracted plurality of coordinates.

  The output unit 1022 outputs the calculated amount of coordinate shake.

1.2 Operation of Touch Panel FIG. 2 is a flowchart showing the operation of the touch panel according to the first embodiment.

  The touch panel 1000 repeatedly executes processing operations at a constant cycle. Therefore, as shown in FIG. 2, the touch panel 1000 executes the first processing operation in step S11, the second processing operation in step S12,..., The pth processing operation in step S13. In FIG. 2, the processing is terminated after the p-th processing operation is executed, but this may be repeated indefinitely until the power is turned off.

  FIG. 3 is a flowchart showing one processing operation of the touch panel according to the first embodiment.

  In step S101 shown in FIG. 3, the sensing unit 1014 measures changes in capacitance in a plurality of sensors provided in the touch sensor panel 1012 and acquires the measurement results. The measurement result includes a plurality of capacitance values each indicating a change in capacitance.

  In subsequent step S102, the detection unit 1016 detects a touch from a plurality of acquired capacitance values and acquires touch information. The touch information includes a result of determination as to whether or not a touch is performed, and includes coordinates detected when it is determined that a touch is performed. The coordinates indicate the touch position. The touch information may include other information. For example, the touch information may include an identification number that identifies two or more touches from each other.

  In the coordinate detection, the maximum capacitance value among the plurality of capacitance values is specified, and the coordinate corresponding to the sensor that has output the specified maximum capacitance value is detected. The coordinates may be corrected based on a capacitance value output from a sensor arranged around the sensor that has output the maximum capacitance value. Details of coordinate detection are described in, for example, Japanese Patent Application Laid-Open No. 2010-191778. Coordinate detection may be performed by other methods.

  In subsequent step S103, the extraction unit 1018 determines whether or not the touch has disappeared. If the touch has not disappeared, the process proceeds to step S104. If the touch has disappeared, the process proceeds to step S106. Proceed. The extraction unit 1018 has been determined by the detection unit 1016 that the touch has been performed in the previous processing operation, but the touch disappears when the detection unit 1016 determines that the touch has not been performed in the current processing operation. If it is not, it is determined that the touch has not disappeared.

  In step S104, the extraction unit 1018 determines whether or not the indicator is being touched. If it is determined that the indicator is being touched, the process proceeds to step S105, and the indicator is not being touched. If it is determined, the current processing operation is terminated. The extraction unit 1018 determines that the indicator is being touched when the detection unit 1016 determines that a touch is being performed in the current processing operation, and determines that the indicator is not being touched otherwise. To do.

  In step S105, the extraction unit 1018 stores the coordinates detected in the current processing operation, and ends the current processing operation.

By executing steps S101 to S105 in each of the plurality of processing operations, m coordinates (X ₁ , Y ₁ ) indicating the touch positions continuously detected during the period in which the touch continues. , (X ₂ , Y ₂ ),..., (X _m , Y _m ) are stored. m becomes larger as the duration of the touch becomes longer. The m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) constitute a plurality of coordinates detected by the detection unit 1016.

  The appearance of a touch is considered to have occurred when the detection unit 1016 determines that a touch has not been performed in the previous processing operation, but has been determined by the detection unit 1016 that a touch has been performed in the current processing operation. It is. The disappearance of the touch is considered to have occurred when the detection unit 1016 determines that the touch has been performed in the previous processing operation, but has been determined by the detection unit 1016 that the touch has not been performed in the current processing operation. It is.

In step S106, the extraction unit 1018 acquires stationary touch information. When the extraction unit 1018 can acquire the static touch information, the acquired static touch information includes m coordinates (X ₁ , Y ₁ ), (X ₂ ) indicating the touch position in the period when the static touch is performed. , Y ₂ ),... (X _m , Y _m ).

The extraction unit 1018 obtains m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) when acquiring static touch information. All of them are subject to determination as to whether or not a static touch has been performed. m is an integer of 2 or more. A part of m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) may be determined.

In order to perform this determination, first, the extraction unit 1018 obtains an average X coordinate X _avg of m X coordinates X ₁ , X ₂ ,..., X _m to be determined, and m determination targets. Y coordinates Y ₁ , Y ₂ ,..., Y _m are obtained as average Y coordinates Y _avg .

The extraction unit 1018 also determines m distances | X ₁ −X _avg |, | from the m X coordinates X ₁ , X ₂ ,..., X _m to be determined to the average X coordinate X _avg. X ₂ −X _avg |,..., | X _m −X _avg |, from the m Y coordinates Y ₁ , Y ₂ ,..., Y _m to be determined to the average Y coordinate Y _{avg M} distances | Y ₁ −Y _avg |, | Y ₂ −Y _avg |,..., | Y _m −Y _avg | The distance from one coordinate to another coordinate is the absolute value of the difference between the one coordinate and the other coordinate.

Further, the extraction unit 1018 determines that the m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) to be determined satisfy the following conditions. In this case, the m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) to be determined are touch positions in a period during which the static touch is performed. Let m coordinates denote

Condition: m distances | X ₁ −X _avg |, | X ₂ −X _avg |,..., | X _m −X _avg | _M distances | X ₁ −X _avg |, | X ₂ −X _avg |,..., | X _m −X _avg |, and m distances | Y ₁ −Y _avg |, | Y ₂ −Y _avg |,..., | Y _m −Y _avg | ₁ −Y _avg |, | Y ₂ −Y _avg |,..., | Y _m −Y _avg |

When the m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) to be determined do not satisfy the above conditions, the extraction unit 1018 is stationary. Touch information cannot be obtained.

  FIG. 4 is a diagram illustrating an example of coordinates detected when a static touch is performed on the touch panel. FIG. 5 is a diagram illustrating an example of coordinates detected when the indicator is moved to draw an arc while a touch is being performed on the touch panel.

  In each of FIGS. 4 and 5, the X coordinate is taken on the horizontal axis, the Y coordinate is taken on the vertical axis, and the origin is on the upper left.

  Coordinates 1101, 1102, 1103, 1104, 1105 and 1106 shown in FIG. 4 are detected coordinates. Coordinates 1101, 1102, 1103, 1104, 1105 and 1106 are detected in the order described. A coordinate 1107 shown in FIG. 4 is an average coordinate of the coordinates 1101, 1102, 1103, 1104, 1105, and 1106. The rectangular frame 1108 shown in FIG. 4 is set so that half of its width becomes a threshold applied to the X coordinate and half of its height becomes a threshold applied to the Y coordinate. In the coordinates 1101, 1102, 1103, 1104, 1105 and 1106, only the coordinate 1104 is outside the rectangular frame 1108, and the above condition is satisfied. Therefore, when the coordinates 1101, 1102, 1103, 1104, 1105 and 1106 are detected, it is determined that the static touch has been performed, and the coordinates 1101, 1102, 1103, 1104, 1105 and 1106 are used to calculate the amount of blurring of the coordinates. Be the basis.

  Coordinates 1111, 1112, 1114, 1115 and 1116 shown in FIG. 5 are detected coordinates. Coordinates 1111, 1112, 1114, 1115 and 1116 are detected in the order listed. A coordinate 1117 shown in FIG. 5 is an average coordinate of the coordinates 1111, 1112, 1114, 1115, and 1116. The rectangular frame 1118 shown in FIG. 5 is set so that half of its width becomes a threshold applied to the X coordinate and half of its height becomes a threshold applied to the Y coordinate. At coordinates 1111, 1112, 1114, 1115 and 1116, coordinates 1111, 1112, 1114, 1115 and 1116 are outside the rectangular frame 1118, and the above conditions are not satisfied. Therefore, when the coordinates 1111, 1112, 1114, 1115 and 1116 are detected, it is determined that the static touch is not performed, and the coordinates 1111, 1112, 1114, 1115 and 1116 are used as the basis for calculating the blur amount of the coordinates. Don't be.

  Thus, when the continuity of the change in distance is evaluated, the influence of randomly generated noise is eliminated, and it is accurately determined whether or not the touch position has changed.

The above conditions may be replaced with other conditions. For example, the average of the X-coordinate _{X avg} is, m-number of X-coordinate of the target of judgment _{X 1,} X 2, · · ·, n pieces of X coordinate early of _{X m X 1,} X 2, · · · , X _n may be replaced by the average X coordinate, and the average Y coordinate Y _avg is the initial n of the _m Y coordinates Y ₁ , Y ₂ ,. Y coordinates Y ₁ , Y ₂ ,..., Y _n may be replaced with average coordinates (n <m). Instead of determining whether the distance exceeds the threshold value twice or more continuously, it may be determined whether the distance exceeds the threshold value once or continuously three times or more. m Euclidean distances {(X ₁ −X _avg ) ² + (Y ₁ −Y _avg ) ² } ^1/2 , {(X ₂ −X _avg ) ² + (Y ₂ −Y _avg ) ² } ^1/2 ,..., {(X _m −X _avg ) ² + (Y _m −Y _avg ) ² } ^1/2 may be determined whether or not the threshold value is continuously exceeded twice or more. The Euclidean distance may be replaced with a distance other than the Euclidean distance.

  In subsequent step S107, the extraction unit 1018 deletes the stored coordinates.

  In the subsequent step S108, the extraction unit 1018 advances the process to step S109 if there is still touch information, and ends the current processing operation if there is no still touch information.

In step S109, the calculation unit 1020 calculates the coordinates from the m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) included in the stationary touch information. Calculate the amount of shake. The calculation unit 1020 obtains m distances | X ₁ −X _avg |, | X ₂ −X _avg |,..., | X _m −X _avg |, and m distances | Y ₁ −Y _avg | _{, | Y 2 -Y avg |,} ···, | Y m -Y avg | look, m-number of distance _{| X 1 -X avg |, |} X 2 -X avg |, ···, | X m The average value of −X _avg | is the amount of shake of the X coordinate, and the average value of m distances | Y ₁ −Y _avg |, | Y ₂ −Y _avg |,..., | Y _m −Y _avg | The amount of blur of the Y coordinate. In addition, you may obtain | require the blur amount of this coordinate with another method. For example, the standard deviation of _m X coordinates X ₁ , X ₂ ,..., X _m may be the amount of shake of the X coordinates, and m Y coordinates Y ₁ , Y ₂ ,. The standard deviation of _m may be the amount of shake of the Y coordinate.

  In the subsequent step S110, the output unit 1022 outputs the calculated amount of coordinate blur to an external microcomputer or the like.

  In touch panel 1000 according to Embodiment 1, stationary touch information is extracted from a plurality of coordinates detected when a normal touch operation is performed, and the amount of coordinate blur is calculated from the extracted stationary touch information. The touch operation includes a static touch and a touch that is not a static touch. In the touch panel 1000 according to the first embodiment, the amount of coordinate blur is obtained only for the static touch. For this reason, in touch panel 1000 according to the first embodiment, the amount of coordinate blur is obtained while a normal touch operation is performed without making the user aware of the amount of coordinate shake.

2 Embodiment 2
FIG. 1 is also a block diagram showing the touch panel of the second embodiment. FIG. 2 is also a flowchart showing the operation of the touch panel according to the second embodiment. FIG. 3 is also a flowchart showing one processing operation of the touch panel of the second embodiment.

  The second embodiment is different from the first embodiment in that the process for obtaining stationary touch information performed in step S106 of the second embodiment is different from that of the first embodiment. Therefore, in the following, the process for acquiring the static touch information performed in step S106 of the second embodiment will be described exclusively.

In the second embodiment, as in the first embodiment, when the extraction unit 1018 acquires stationary touch information, m coordinates (X ₁ , Y ₁ ), (X ₂ , Y) stored are acquired. ₂ ),..., (X _m , Y _m ) are all subject to determination as to whether or not a stationary touch has been performed. The m coordinates to be determined are from the first detected coordinate (X ₁ , Y ₁ ) to the mth detected coordinate (X _m , Y _m ). m is an integer of 2 or more.

The extraction unit 1018, for the case where i is 1, 2,..., M−1, the i + 1th detected coordinate (X _{i + 1} ) from the ith detected coordinate (X _i , Y _i ). , Y _{i + 1} ), the i-th direction Di, which is the direction toward Y _{i + 1} ), is obtained, and the distance from the i-th detected coordinate (X _i , Y _i ) to the i + 1-th detected coordinate (X _{i + 1} , Y _{i + 1} ) A certain i-th distance Li is obtained.

  In addition, the extraction unit 1018, when i is 1, 2,..., M−1, when the i−1th direction Di−1 and the ith direction Di have continuity. By selecting the i-th distance Li corresponding to the i-th direction Di, at least one distance is selected. The i-1th direction Di-1 and the ith direction Di are considered to have continuity because the change of the ith direction Di from the i-1th direction Di-1 is less than 90 °. Is the case. More generally, the i-1th direction Di-1 and the ith direction Di are determined to have continuity because the ith direction Di from the i-1th direction Di-1. This is a case where the amount of change to is smaller than the set amount of change.

Further, the extraction unit 1018 obtains an average distance of at least one selected distance, and determines that the average distance of the selected at least one distance is based on a criterion that the obtained average distance is equal to or less than the set distance. If the condition is satisfied, it is determined that m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) to be determined satisfy the condition, and the determination target M coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) are m coordinates indicating the touch position in the period when the stationary touch is performed, To do.

  When the coordinates change greatly due to suddenly generated noise, the coordinates greatly change between the direction where the greatly changed coordinates are the start point and the direction where the coordinates are the end point. For this reason, as described above, when a direction having continuity is selected and the distance from the start point coordinate to the end point coordinate in the selected direction is selected, the distance affected by noise is not selected. Then, it is accurately determined whether or not the stationary touch has been performed.

  FIG. 6 is a diagram illustrating an example of coordinates detected when a static touch is performed on the touch panel. In FIG. 6, the X coordinate is taken on the horizontal axis, the Y coordinate is taken on the vertical axis, and the origin is located on the upper left.

  The coordinates 2101, 2102, 2103, 2104, 2105 and 2106 shown in FIG. 6 are detected coordinates. Coordinates 2101, 1022, 2103, 2104, 2105 and 2106 are detected in the order described. The directions D1, D2, D3, D4 and D5 shown in FIG. 6 are respectively a direction from the coordinate 2101 to the coordinate 2102, a direction from the coordinate 2102 to the coordinate 2103, a direction from the coordinate 2103 to the coordinate 2104, and a coordinate from the coordinate 2104 to the coordinate 2104. The direction toward 2105 and the direction from coordinate 2105 toward coordinate 2106. At coordinates 2101, 2102, 2103, 2104, 2105 and 2106, the coordinate 2104 greatly changes from the coordinate 2103 due to suddenly generated noise, and the direction D3 in which the coordinate 2104 is the end point coordinate is 90 ° from the direction D2. As described above, the direction D4 in which the coordinates 2104 are the coordinates of the starting point changes by 90 ° or more from the direction D3. Therefore, when the coordinates 2101, 2102, 2103, 2104, 2105, and 2106 shown in FIG. 6 are detected, the distance L 1 from the coordinates 2101 to the coordinates 2102, the distance L 2 from the coordinates 2102 to the coordinates 2103, and the coordinates from the coordinates 2105 A distance L5 to 2106 is selected, and it is determined whether or not the average distance between the distances L1, L2, and L5 is equal to or less than the set distance.

  In touch panel 1000 of the second embodiment, stationary touch information is extracted from a plurality of coordinates detected when a normal touch operation is performed, and the amount of coordinate blur is calculated from the extracted stationary touch information. The touch operation includes a static touch and a touch that is not a static touch. In the touch panel 1000 according to the second embodiment, the amount of coordinate blur is obtained only for the static touch. For this reason, in the touch panel 1000 according to the second embodiment, the amount of coordinate blur is obtained while a normal touch operation is performed without making the user aware of the amount of coordinate blur.

  In addition, in the touch panel 1000 of the second embodiment, the distance affected by the noise is not selected, and it is accurately determined whether or not the stationary touch has been performed.

3 Embodiment 3
FIG. 1 is also a block diagram showing the touch panel of the third embodiment. FIG. 2 is also a flowchart showing the operation of the touch panel according to the third embodiment. FIG. 7 is a flowchart illustrating one processing operation of the touch panel according to the third embodiment.

In the first embodiment, m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) indicating the touch position for the period in which the touch is performed. Are all subject to determination as to whether or not a stationary touch has been performed. On the other hand, in the third embodiment, every time n coordinates are detected in the period in which the touch continues, the detected n coordinates are used to determine whether or not a stationary touch has been performed. Be targeted. In the following, the configuration employed in the third embodiment to bring about this difference will be described exclusively. For configurations not described, the configuration employed in the first embodiment is employed in the third embodiment. The configuration adopted in the second embodiment may be adopted in the third embodiment.

  In step S301 shown in FIG. 7, as in step S101 of the first embodiment, the sensing unit 1014 measures changes in capacitance in a plurality of sensors provided in the touch sensor panel 1012, and the measurement result is obtained. get. The measurement result includes a plurality of capacitance values each indicating a change in capacitance.

  In subsequent step S302, as in step S102 of the first embodiment, the detection unit 1016 detects a touch from a plurality of acquired capacitance values and acquires touch information. The touch information includes a result of determination as to whether or not a touch is performed, and includes coordinates detected when it is determined that a touch is performed. The coordinates indicate the touch position.

  In the subsequent step S303, the extraction unit 1018 determines whether or not the indicator is being touched as in step 104 of the first embodiment. If it is determined that the indicator is not being touched, the process is performed in step S304. If it is determined that the indicator is being touched, the process proceeds to step S305.

  In step S304, the extraction unit 1018 deletes the stored coordinates.

  In step S305, the extraction unit 1018 stores the coordinates detected in the current processing operation.

  In subsequent step S306, the extraction unit 1018 determines whether or not n coordinates are stored. If n coordinates are stored, the process proceeds to step S307, and the n coordinates are stored. If not, the current processing operation is terminated. n is the set number, for example, 50.

By executing steps S301 to S306 in each of the plurality of processing operations, n coordinates (X _j , Y _j ), (X _{j + 1} , Y _{j + 1} ),. , (X _{j + n−1} , Y _{j + n−1} ) are detected and stored, the stored n coordinates (X _j , Y _j ), (X _{j + 1} , Y _{j + 1} ),. _{j + n−1} , Y _{j + n−1} ) is a target for determining whether or not the stationary touch has been performed in step S307. The stored n coordinates (X _j , Y _j ), (X _{j + 1} , Y _{j + 1} ),..., (X _{j + n−1} , Y _{j + n−1} ) are continuously detected by the detection unit 1016. One of m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ),..., (X _m , Y _m ) that constitute a plurality of coordinates and indicate a touch position in a period where the touch continues. (N <m). In addition, after the n coordinates (X _j , Y _j ), (X _{j + 1} , Y _{j + 1} ),..., (X _{j + n−1} , Y _{j + n−1} ) are determined, n When coordinates (X _{j + n} , Y _{j + n} ), (X _{j + n + 1} , Y _{j + n + 1} ),..., (X _{j + 2n−1} , Y _{j + 2n−1} ) are detected, n newly detected coordinates (X _{j + n} , Y _{j + n} ), (X _{j + n + 1} , Y _{j + n + 1} ),..., (X _{j + 2n−1} , Y _{j + 2n−1} ) are newly stored, and the newly stored n coordinates (X _{j + n} , Y _{j + n} ), (X _{j + n + 1} , Y _{j + n + 1} ),..., (X _{j + 2n−1} , Y _{j + 2n−1} ) are newly determined.

In step S306, it is determined whether the set time has elapsed, not the number of stored coordinates. If the set time has elapsed, the process proceeds to step S307, and if the set time has not elapsed, the current time The processing operation may be terminated. In this case, each time the set time elapses in the period in which the touch continues, a plurality of coordinates detected at the set time that has elapsed are stored, and whether or not the stored plurality of coordinates has been subjected to a stationary touch. It is an object of judgment. The plurality of stored coordinates constitute a plurality of coordinates detected by the detection unit 1016, and m coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ ) indicating a touch position in a period during which the touch continues. ),..., (X _m , Y _m ).

  In step S307, the extraction unit 1018 acquires stationary touch information.

The extraction unit 1018 uses n stored coordinates (X _j , Y _j ), (X _{j + 1} , Y _{j + 1} ),..., (X _{j + n−1} , Y _{j + n−1} ) as objects of determination. .

  In addition, the extraction unit 1018 divides the period during which the touch is performed from the first period to the qth period, and also divides the n coordinates stored in accordance with each period. q is an integer of 2 or more, for example, 5. In this case, for example, if n is 50, 50 coordinates are divided into 5 groups (periods).

  Further, the extraction unit 1018 obtains the average X coordinate X (i) in the i-th period for each of i from 1 to q, and obtains the average Y-coordinate Y (i) in the i-th period. Ask.

  In addition, the extraction unit 1018, for each of i from 1 to q−1, from the average X coordinate X (i) in the i-th period to the average X coordinate X (i + 1) in the i + 1-th period. The i-th distance DX (i) that is the distance of the i-th period is obtained, and the i-th distance DX (i) that is the distance from the average Y-coordinate Y (i) in the i-th period to the average Y-coordinate Y (i + 1) in the i + 1th period The distance DY (i) is obtained.

In addition, the extraction unit 1018 is configured such that each of the first distance DX (1) to the q−1th distance DX (q−1) is equal to or less than the threshold, and the q−1th distance from the first distance DY (1). The criterion that each of the distances DY (q−1) is equal to or less than the threshold is based on the first distance DX (1) to the q−1th distance DX (q−1) and the first distance DY (1). To the (q−1) th distance DY (q−1), the n coordinates (X _j , Y _j ), (X _{j + 1} , Y _{j + 1} ) _{,. −1} , Y _{j + n−1} ) satisfy the condition, and n coordinates (X _j , Y _j ), (X _{j + 1} , Y _{j + 1} ),..., (X _{j + n−1} , Y _{j + n−1} ) is n coordinates indicating the touch position in the period when the static touch is performed.

  The average coordinates are less susceptible to noise than each of the plurality of averaged coordinates. For this reason, when the distance from one average coordinate to another average coordinate is obtained, and it is determined whether or not a static touch has been performed based on the obtained distance, the determination is influenced by noise. It is hard to receive.

When the stationary touch information is acquired in step S307, as in the first or second embodiment, m coordinates (X ₁ , Y ₁ ), (X ₂ , All of Y ₂ ),..., (X _m , Y _m ) may be determined.

  In subsequent step S308, the extraction unit 1018 deletes the stored coordinates.

  In the subsequent step S309, if there is still touch information, the extraction unit 1018 advances the process to step S310, and if there is no still touch information, ends the current processing operation.

In step S310, as in step S109 of the first embodiment, the calculation unit 1020 includes n coordinates (X _j , Y _j ), (X _{j + 1} , Y _{j + 1} ),. , (X _{j + n−1} , Y _{j + n−1} ), the amount of coordinate blur is calculated.

  In subsequent step S311, the output unit 1022 outputs the calculated amount of coordinate blur to an external microcomputer or the like.

  In touch panel 1000 according to the third embodiment, stationary touch information is extracted from a plurality of coordinates detected when a normal touch operation is performed, and the amount of coordinate blur is calculated from the extracted stationary touch information. The touch operation includes a static touch and a touch that is not a static touch. In the touch panel 1000 according to the third embodiment, the amount of coordinate blur is obtained only for the static touch. For this reason, in the touch panel 1000 according to the third embodiment, the amount of coordinate blur is obtained while a normal touch operation is being performed without making the user aware of the amount of coordinate blur.

  In addition, in touch panel 1000 according to the third embodiment, coordinates detected during a part of the touch period are set as targets for determining whether or not a static touch has been performed, and are set as static touch information. The For this reason, even when the touch position moves during the period in which the touch is performed, if there is a period during which the touch position is kept constant, the amount of coordinate blur is obtained for the stationary touch during the period. .

  In addition, in the touch panel 1000 of Embodiment 3, the period during which the touch is performed is divided into q periods, and the average coordinates in each of the q periods are obtained from the n coordinates to be determined. Then, it is determined whether or not the stationary touch has been performed based on the average coordinates. Since the average coordinates are not easily affected by noise, the touch panel 1000 according to Embodiment 3 accurately determines whether or not a static touch has been performed even when the noise is strong.

4 Embodiment 4
4.1 Touch Panel FIG. 8 is a block diagram illustrating the touch panel according to the fourth embodiment.

  A touch panel 4000 illustrated in FIG. 8 includes a touch sensor panel 4012, a sensing unit 4014, a detection unit 4016, an extraction unit 4018, a calculation unit 4020, a determination unit 4022, and an output unit 4024. Touch panel 4000 may include components other than these components.

  Touch panel 4000 outputs touch information. The touch information includes coordinates indicating a touch position where a touch with an indicator such as a finger is performed. The coordinate is subjected to a process for suppressing the blur of the coordinate.

  The touch sensor panel 4012, the sensing unit 4014, the extraction unit 4018, and the calculation unit 4020 provided in the touch panel 4000 according to the fourth embodiment are the touch sensor panel 1012, sensing unit 1014, and extraction unit provided in the touch panel 1000 according to the first embodiment. 1018 and the calculation unit 1020 are the same.

  The touch sensor panel 4012 includes a plurality of sensors.

  The sensing unit 4014 measures changes in capacitance in a plurality of sensors provided in the touch sensor panel 4012 and acquires measurement results.

  The detection unit 4016 determines whether or not the touch with the indicator is performed from the acquired results of the plurality of measurements. Moreover, the detection part 4016 detects the coordinate which shows a touch position from the acquired measurement result, when it determines with the touch by the indicator being performed.

  In addition, the detection unit 4016 performs a process for suppressing the blurring of the detected coordinates based on the parameter values. Thereby, the coordinate by which blurring was suppressed is acquired.

  The extraction unit 4018 extracts a plurality of coordinates indicating the temporal change of the touch position during the period in which the stationary touch is performed, from the detected coordinates that are not subjected to the process of suppressing the blur of the coordinates.

  The calculation unit 4020 calculates a blur amount of coordinates from the extracted plurality of coordinates.

  The determination unit 4022 determines the parameter value described above from the calculated amount of coordinate blur.

  The output unit 4024 outputs a plurality of coordinates in which the shake described above is suppressed.

4.2 Operation of Touch Panel FIG. 2 is also a flowchart showing the operation of the touch panel according to the fourth embodiment. FIG. 9 is a flowchart showing one processing operation of the touch panel according to the fourth embodiment.

  In step S401 illustrated in FIG. 9, the sensing unit 4014 measures changes in capacitance in a plurality of sensors provided in the touch sensor panel 4012 and acquires the measurement results. The measurement result includes a plurality of capacitance values each indicating a change in capacitance.

  In subsequent step S402, the detection unit 4016 detects a touch from a plurality of acquired capacitance values and acquires touch information. The touch information includes a result of determination as to whether or not a touch is performed, and includes coordinates detected when it is determined that a touch is performed.

  In subsequent step S <b> 403, the detection unit 4016 performs processing for suppressing the shake of the coordinates with respect to the detected coordinates, and acquires the coordinates in which the shake is suppressed.

  In subsequent step S404, output unit 4016 outputs touch information to an external microcomputer or the like. The output touch information includes coordinates in which shaking is suppressed.

  By executing steps S401 to S404 in each of a plurality of processing operations, coordinates are detected, and processing for suppressing the blurring of the coordinates is performed on the detected plurality of coordinates, and the blurring is suppressed. Coordinates are acquired and output.

  In the process of suppressing the blur of coordinates in step S403, the coordinates output to the outside are held as base coordinates, and a jitter suppression area centered on the base coordinates is set. If the newly detected coordinates are inside the jitter suppression area, the base coordinates are newly output coordinates. If the newly detected coordinate is not inside the jitter suppression area, the newly detected coordinate is set as a newly output coordinate and a new base coordinate. Details of the processing for suppressing the blurring of coordinates are described in, for example, Japanese Patent Application Laid-Open No. 2015-118445. Coordinate blur may be suppressed by other methods.

  In subsequent step S405, the extraction unit 4018 determines whether or not the indicator is being touched. If it is determined that the indicator is not being touched, the process proceeds to step S406, and the indicator is being touched. If it is determined, the process proceeds to step S407. The extraction unit 4018 determines that the indicator is being touched when the detection unit 4016 determines that a touch is being performed in the current processing operation, and otherwise determines that the indicator is not being touched. To do.

  In step S406, the extraction unit 4018 deletes the stored coordinates and ends the current processing operation.

  In step S407, the extraction unit 4018 stores the coordinates detected in the current processing operation.

  In subsequent steps S408 to S412, the same processing as in the third embodiment is performed. Instead of the same processing as in the third embodiment, the same processing as in the first or second embodiment may be performed.

  In step S408, the extraction unit 4018 determines whether or not n coordinates are stored. If n coordinates are stored, the process proceeds to step S409, and the n coordinates are stored. If not, the current processing operation is terminated.

  In step S409, the extraction unit 4018 acquires stationary touch information.

  In subsequent step S410, extraction unit 4018 deletes the stored coordinates.

  In subsequent step S411, if there is still touch information, the extraction unit 4018 advances the process to step S412. If there is no still touch information, the current processing operation is terminated.

  In step S412, the calculation unit 4020 calculates the amount of blurring of the coordinates from n coordinates included in the stationary touch information.

  In the subsequent step S413, the determination unit 4022 determines a parameter value that is a basis of the process of suppressing the coordinate blur from the calculated coordinate blur amount. The determined parameter value is used by the detection unit 4016 in the next processing operation.

  The parameter values are the width and height of the jitter suppression area. The width of the jitter suppression area is obtained by multiplying the shake amount of the X coordinate by a set value. The height of the jitter suppression area is obtained by multiplying the shake amount of the Y coordinate by a set value. Alternatively, instead of obtaining the parameter value from the amount of blurring of the coordinates obtained in the current processing operation, the amount of blurring of the coordinates obtained in the past processing operation is stored and obtained in the current and past processing operations. The parameter value may be obtained from the shake amount of a plurality of coordinates. For example, a parameter value may be obtained by multiplying an intermediate value of blur amounts of a plurality of coordinates obtained in the current and past processing operations by a set value. An intermediate value of n values is a value that appears n ÷ 2nd when n values are arranged in ascending order.

  In touch panel 4000 of the fourth embodiment, stationary touch information is extracted from a plurality of coordinates detected when a normal touch operation is performed, and the amount of coordinate blur is calculated from the extracted stationary touch information. The touch operation includes a static touch and a touch that is not a static touch. In the touch panel 4000 according to the fourth embodiment, the amount of coordinate blur is determined only for the static touch. For this reason, in touch panel 4000 according to the fourth embodiment, the amount of coordinate blur is obtained while a normal touch operation is performed without making the user aware of the amount of coordinate blur.

  In addition, according to the fourth embodiment, the actual coordinate blur amount is reflected in the processing for suppressing the coordinate blur, and the coordinate blur is suppressed based on the optimum parameter value corresponding to the coordinate blur amount. Processing is performed. For this reason, coordinates in which shaking is suppressed while the response of the touch panel 4000 is well maintained are output from the touch panel 4000. In addition, even when the degree of coordinate blur changes, the process for suppressing coordinate blur can easily follow the change.

5 Simultaneous Multipoint Touch In the first to fourth embodiments, the operation of the touch panel has been described as an example where one touch is performed. However, two or more touches may be performed at the same time. If two or more touches are detected when touch detection is performed, the touch information includes an identification number that identifies the touch, and thus two or more touches are handled independently using the identification number. And the above operations can be performed for each of two or more touches.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  1000, 4000 touch panel, 1012 and 4012 touch sensor panel, 1014 and 4014 sensing unit, 1016 and 4016 detection unit, 1018 and 4018 extraction unit, 1020 and 4020 calculation unit, 1022 and 4024 output unit, and 4022 determination unit.

Claims (8)

A touch sensor panel;
A sensing unit that measures a change in capacitance in the touch sensor panel and obtains a measurement result; and
A detection unit for detecting a first coordinate indicating a touch position from the measurement result;
An extraction unit that extracts a second coordinate indicating a touch position in a period in which a static touch is performed from the first coordinate;
A calculation unit that calculates a blur amount of coordinates from the second coordinates;
An output unit for outputting a blur amount of the coordinates;
Touch panel equipped with. The detector is
It is determined whether or not a touch is performed from the result of the measurement,
The extraction unit includes:
The first coordinate obtained during the period from the touch until it disappears is detected as the third coordinate, and all the third coordinates are used as the coordinates to be determined.
The touch panel according to claim 1, wherein when it is determined that the coordinates of the determination target satisfy a condition, the coordinates of the determination target are the second coordinates. The detector is
It is determined whether or not a touch is performed from the result of the measurement,
The extraction unit includes:
Detecting the first coordinate of the period from the touch until it disappears as the third coordinate,
Each time the set number of the third coordinates is detected in the period, the set number of coordinates is set as a determination target coordinate,
The touch panel according to claim 1, wherein when it is determined that the coordinates of the determination target satisfy a condition, the coordinates of the determination target are the second plurality of coordinates. The detector is
It is determined whether or not a touch is performed from the result of the measurement,
The extraction unit includes:
Detecting the first coordinate of the period from the touch until it disappears as the third coordinate,
Each time the set time elapses in the period, the obtained third coordinates are set as the coordinates to be determined,
The touch panel according to claim 1, wherein when it is determined that the coordinates of the determination target satisfy a condition, the coordinates of the determination target are the second coordinates. The detector is
It is determined whether or not a touch is performed from the result of the measurement,
The extraction unit includes:
Detecting the first coordinate of the period from the touch until it disappears as the third coordinate,
All or a part of the third coordinates are determined as coordinates to be determined,
Obtain an average coordinate of the coordinates of the determination target,
Find a plurality of distances from the coordinates of the determination target to the average coordinates,
The touch panel according to any one of claims 1 to 4, wherein, when the plurality of distances satisfy a reference, the coordinates of the determination target are the second coordinates. The detector is
It is determined whether or not a touch is performed from the result of the measurement,
The extraction unit includes:
Detecting the first coordinate of the period from the touch until it disappears as the third coordinate,
All or a part of the third coordinates are determined as coordinates to be determined,
When i is each of 1 to m-1 when the coordinates of the determination target are from the first detected coordinate to the mth detected coordinate and m is an integer of 2 or more. , The i-th direction that is the direction from the i-th detected coordinate to the i + 1-th detected coordinate, and the i-th direction that is the distance from the i-th detected coordinate to the i + 1-th detected coordinate Determining the distance, and selecting at least one distance by selecting the i-th distance when the change amount in the i-th direction from the i-1th direction is smaller than the set change amount;
The touch panel according to any one of claims 1 to 4, wherein, when the selected at least one distance satisfies a criterion, the determination target coordinate is set as the second coordinate. The detector is
It is determined whether or not a touch is performed from the result of the measurement,
The extraction unit includes:
Detecting the first coordinate of the period from the touch until it disappears as the third coordinate,
All or a part of the third coordinates are determined as coordinates to be determined,
Dividing each period from a first period in which q is an integer of 2 or more to a qth period;
In the case where i is 1 to q, the average coordinates in the i-th period are obtained from the coordinates of the determination target, and the average coordinates in the i-th period to the average coordinates in the i + 1-th period. Find the i-th distance, which is the distance,
In the case where i is 1 to q−1, the average coordinates in the i-th period are obtained, and the i-th distance from the average coordinates in the i-th period to the average coordinates in the i + 1-th period Find the distance of
The touch panel according to any one of claims 1 to 4, wherein when the first distance to the q-1th distance satisfy a reference, the coordinates of the determination target are the second plurality of coordinates. A touch sensor panel;
A sensing unit that measures a change in capacitance in the touch sensor panel and obtains a measurement result; and
The first coordinate indicating the touch position is detected from the measurement result, and the coordinate in which the blur is suppressed is obtained by performing the process of suppressing the blur of the coordinate on the first coordinate based on the parameter value. A detection unit;
An extraction unit that extracts a second coordinate indicating a touch position in a period in which a static touch is performed from the first coordinate;
A calculation unit that calculates a blur amount of coordinates from the second coordinates;
A determination unit that determines the parameter value from the amount of blurring of the coordinates;
An output unit for outputting coordinates in which the blur is suppressed;
Touch panel equipped with.

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