JP2019128707A - Display input device - Google Patents

Abstract

To provide a display input device on which a reliable touch operation can be performed.SOLUTION: The display input device is configured to include: a touch panel 30 including a touch sensor 10 as a first detection unit that detects the operation state of an object to be detected on an operation surface 25 and including a display unit 20 that displays a display image 27 on the operation surface 25; a camera 40 as a second detection unit that detects an operation action performed on the operation surface 25; and a control unit 50 that controls actions of the touch sensor 10 and the display unit 20 and that is provided with an estimation unit for estimating a region, on the operation surface 25, to be operated by the object to be detected, on the basis of detection information detected by the camera 40, wherein the control unit 50 enlargedly displays the display image 27 in the region on the basis of the estimation result obtained by the estimation unit. Accordingly, before being touched, an icon, etc., to be operated becomes easy to see, whereby the operability is improved.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a display input device.

  2. Description of the Related Art Conventionally, there has been disclosed a display input device that provides a touch panel device with high operability by preventing erroneous operations and malfunctions in in-vehicle electronic devices (see, for example, Patent Document 1).

  This display input device detects separately the touch force given to each of the touch area in which a plurality of touch areas each displayed by a display mark are adjacently arranged, and the detection means which generates a detection signal Command generation means for generating an input command in response to the detection signal, and at least one of a positional relationship and a size relationship between at least one display range of the display mark and one existing range of the touch area corresponding thereto. Adjusting means for adjusting according to the condition setting.

JP 2003-344086 A

  However, the conventional technique detects the touch area by the detection means, and based on this, the positional relationship and the size relationship of the display marks are adjusted according to the condition setting, so that there is a problem that the operation before the touch cannot be handled. . In particular, when this display input device is mounted on a vehicle, there is a problem that a reliable touch operation is difficult due to vehicle vibration.

  Accordingly, an object of the present invention is to provide a display input device that enables a reliable touch operation.

[1] In order to achieve the above object, a touch panel including a first detection unit for detecting an operation state of an object to be detected on an operation surface, a display unit for displaying a display image on the operation surface, and the operation surface The control unit controls the operation of a second detection unit that detects an operation operation, the first detection unit, and the display unit, and operates the detection target based on detection information detected by the second detection unit. A control unit including an estimation unit that estimates the area on the operation surface, and the control unit enlarges and displays the display image in the region based on the estimation result of the estimation unit. A display input device is provided.
[2] The display input device according to [1], wherein the control unit changes an enlargement ratio of the enlarged display according to a distance between the operation surface and the detection target.
[3] The display input device according to [2], wherein the enlargement ratio is set to be larger as a distance between the operation surface and the detection object is smaller.
[4] The display according to any one of [1] to [3], wherein the first detection unit is a capacitive touch sensor, and the second detection unit is a camera device. It may be an input device.
[5] The display input device according to any one of [1] to [3], wherein the first detection unit and the second detection unit are capacitive touch sensors. Also good.

  According to the display input device of the present invention, a reliable touch operation can be performed.

FIG. 1 is an overall configuration diagram of a display input device according to a first embodiment of the present invention. FIG. 2 is a three-dimensional perspective view of a passenger compartment showing a configuration when the display input device according to the first embodiment of the present invention is mounted on a vehicle. FIG. 3A is a diagram illustrating an initial icon display state, FIG. 3B is a diagram illustrating an icon display state during an operation, and FIG. 3C is an icon during a touch operation. It is a figure which shows the display state of. FIG. 4 is a flowchart showing the operation of the display input device according to the first embodiment of the present invention. FIG. 5 is an overall configuration diagram of a display input device according to the second embodiment of the present invention. FIG. 6 (a) is a view showing the positional relationship between the finger and the touch sensor in the middle of the operation, and FIG. 6 (b) is a view showing the distribution of capacitance values of the touch sensor in FIG. 6 (a). .

(First embodiment of the present invention)
As shown in FIG. 1, the display input device 1 according to the embodiment of the present invention displays a touch sensor 10 as a first detection unit that detects an operation state of an object to be detected with respect to the operation surface 25 and a display on the operation surface 25. A touch panel 30 having a display unit 20 for displaying an image 27, a camera 40 as a second detection unit for detecting an operation on the operation surface 25, a touch sensor 10, and control of operations of the display unit 20. And a control unit 50 including an estimation unit that estimates an area on the operation surface 25 on which the detection target is to be operated based on detection information detected by the camera 40. The control unit 50 is configured to enlarge and display the display image 27 in the touch-estimated region before touching based on the estimation result of the estimation unit.

  In the first embodiment, the finger 40 as a detection target is imaged by the camera 40 which is a camera device as a second detection unit, and a fingertip position before touch is detected based on the imaged detection information. Thus, the region on the operation surface 25 that the finger 100 intends to operate is estimated. Based on the estimation result, the display image 27 in the area on the operation surface 25 to be operated is enlarged, and in particular, a part of the display image 27 in the area to be operated is enlarged.

  In addition, as shown in FIG. 2, the display input device 1 according to the first embodiment is mounted on the vehicle 8, and the camera 40 as the second detection unit is mounted on the room mirror 82, and the touch panel 30 and its periphery are assumed to be imaged.

(Touch sensor 10)
The touch sensor 10 is, for example, a capacitive two-dimensional touch sensor that can detect a two-dimensional coordinate corresponding to the display unit 20. Capacitance (mutual capacitance) generated at the intersecting point of the drive electrode and the detection electrode that are arranged to intersect each other constituting the two-dimensional touch sensor is read out. As an example, a capacitance signal Sc is generated as a capacitance count value obtained by performing analog / digital conversion processing on the read capacitance, and is output to the control unit 50.

  In the display image 27 displayed on the display unit 20, the touch sensor 10 only needs to have a resolution enough to select and detect a selection target such as an icon, a button, or a mark. As an example, the distance between the intersections of the drive electrodes and the detection electrodes provided to intersect each other is approximately the resolution of the touch sensor.

  Further, the touch sensor 10 is not limited to the two-dimensional capacitive touch sensor, and may be another type such as a resistive film sensor, for example.

(Display unit 20)
As shown in FIG. 1, the display unit 20 displays a display image 27 including an icon 28, a menu display, a mark, and the like, and is operated by the touch sensor 10 to select an icon, select a menu, confirm an input, and input processing. Etc. are displayed. When the display unit 20 is attached to the vehicle, for example, as shown in FIG. 2, the display unit 20 is attached to the instrument panel 81 of the vehicle 8. The display unit 20 is, for example, a known liquid crystal display such as a TFT (Thin Film Transistor) type. The display unit 20 is connected to the control unit 50, and display control is performed based on the input display signal _SD .

(Touch panel 30)
The touch panel 30 includes the touch sensor 10 and the display unit 20 described above. The touch sensor 10 and the display unit 20 are stacked, and the touch sensor 10 can detect selection targets such as icons 28, buttons, and marks of the display image 27 displayed on the display unit 20.

  The touch panel 30 is mounted on, for example, the vehicle 8 and is used to operate and control various in-vehicle devices such as a car navigation device by a touch operation.

(Camera 40)
The camera 40 is disposed such that at least the operation surface 25 of the touch panel 30 is an imaging region. In the first embodiment, a three-dimensional camera (3D camera) is used as the camera 40 in order to obtain the distance between the finger 100 as the detection target and the operation surface 25 based on the image captured by the camera 40. . For example, the camera 40 is mounted on the room mirror 82 of the vehicle 8 and is arranged so as to image the operation surface 25 and its periphery.

  Moreover, when the display input device 1 is mounted in a vehicle, it is preferable to use a camera that can be imaged at night, and an image can be generated according to the brightness of light including near-infrared light It is good to use something. Further, an illuminator that irradiates near infrared rays may be provided in the vicinity of the camera 40.

  The camera image Sk captured by the camera 40 can be detected in the state where the background is removed by taking the difference from the background image stored in advance. In the camera image Sk, it is possible to specify a fingertip by a template matching method using image data of various fingers and the like stored in advance in the storage unit 55 as a template. Further, as described above, by using a three-dimensional camera as the camera 40, the distance dz between the operation surface 25 and the fingertip of the finger 100 can be calculated.

(Control unit 50)
The control unit 50 is configured by, for example, a microcomputer including a first detection control unit 51, a display control unit 52, a second detection control unit 53, an estimation unit 54, a storage unit 55, and the like. The control unit 50 includes a CPU (Central Processing Unit) that performs operations and processing on the acquired data according to a stored program, a RAM (Random Access Memory) that is a semiconductor memory, a ROM (Read Only Memory), and the like. . As shown in FIG. 1, the control unit 50 does not need to be configured integrally with the first detection control unit 51, the display control unit 52, the second detection control unit 53, the estimation unit 54, and the storage unit 55. For example, the display control unit may be configured to use an external image processing chip, and the storage unit may be configured to use an external memory or the like. The storage unit 55 stores shape data of fingers for template matching, a touch threshold for touch detection, and the like.

  The first detection control unit 51 periodically switches the connection of the detection electrode (not shown) while the drive signal is supplied to one drive electrode (not shown) constituting the two-dimensional touch sensor, A capacitance (mutual capacitance) generated at a point where the drive electrode and the detection electrode that are arranged intersect is read out. As an example, a capacitance signal Sc is generated as a capacitance count value obtained by performing analog-to-digital conversion processing or the like on the read-out capacitance, and is output to the control unit 50. Thereby, the electrostatic capacitance in the two-dimensional position of the two-dimensional touch sensor can be detected, and the contact (touch) and proximity of the finger to the touch sensor 10 can be detected. The coordinates of the center or the center of gravity of the area that is equal to or greater than the touch threshold can be used as the touch point.

  The display control unit 52 uses the processing and calculation functions of the microcomputer to display the display image 27 and an estimated area on the operation surface 25 to be operated by a finger 100 described later (part of the display image 27). Controls the enlarged display of the image. The display control unit 52 enlarges and displays each icon prepared in advance and an enlarged image around the icon according to a distance dz between an operation surface 25 and a fingertip of the finger 100 described later. This enlarged display can be performed steplessly or in multiple steps depending on the distance dz between the operation surface 25 and the fingertip 101 of the finger 100. For example, as shown in FIGS. 3A, 3B, and 3C, the display can be enlarged in three stages.

  The second detection control unit 53 uses the image data of a finger or the like stored in advance in the storage unit 55 as a template in the camera image Sk to specify a fingertip by a template matching method. Further, as described above, by using a three-dimensional camera as the camera 40, the distance dz between the operation surface 25 and the fingertip of the finger 100 can be calculated. In addition, camera image Sk which the camera 40 imaged can be detected in the state which removed the background by taking the difference with the background image stored beforehand. Through these processes, the second detection control unit 53 can calculate and detect the distance dz between the operation surface 25 and the fingertip 101 of the finger 100. The distance dz is, for example, the distance of a perpendicular line drawn from the fingertip 101 to the operation surface 25.

  The estimation unit 54 estimates a region on the operation surface 25 that the finger 100 intends to operate based on the detection information of the camera 40, that is, the distance dz between the operation surface 25 and the fingertip 101. For example, in the case where the vehicle 8 is the right-hand steering wheel as shown in FIG. 2, it is assumed that the driver operates with the left hand, and the finger 100 tries to operate it as shown in FIG. It is possible to estimate the region 200 on the operation surface 25 to be performed. Further, the second detection control unit 53 detects the fingertip 101 and the back 102 of the hand by a template matching method, and tries to operate the finger 100 based on the three-dimensional coordinates of the fingertip 101 and the center (centroid) 103 of the back of the hand. It can also be estimated by calculating the area 200 on the operation surface 25 to be operated.

  The storage unit 55 stores image data such as a display image 27 and an icon 28 that are menu images as shown in FIGS. In addition, image data in an initial state of icons and image data 201 and 202 in a state of being enlarged step by step are stored. In addition, in order to enlarge and display the area estimated by the estimation unit 54, image data of each enlarged state of each icon area and each icon area including the peripheral area is stored. These pieces of image data can be referred to as needed at the request of the display control unit 52.

  The control unit 50 causes the display control unit 52 to read the display image 27 in the region 200 on the operation surface 25 to be operated on the basis of these estimation results while reading the necessary image data stored in the storage unit 55. Further, it is possible to enlarge and display a part of the display image 27 of the region 200 to be operated, particularly, enlarged display.

  Specifically, the storage unit 55 is estimated during the operation shown in FIG. 3 (b) from the display of the initial state shown in FIG. 3 (a) as shown in FIGS. 3 (a) to 3 (c). Display control is performed as in the case of the enlarged display of the area 200 (image data 201) and the enlarged display of the area 200 when the icon shown in FIG. 3C is touched (image data 202).

(Operation of display input device 1)
FIG. 4 is a flowchart showing the operation of the display input device according to the first embodiment of the present invention. In the display input device 1 according to the first embodiment, the second detection control unit 53 detects a fingertip based on the camera image Sk by capturing the finger 100 with the camera 40, for example, the operation surface 25 and the finger 100 The distance dz with the fingertip is calculated. Based on this, the estimation unit 54 estimates the area 200 on the operation surface 25 that the finger 100 tries to operate. The display control unit 52 magnifies and displays the display image 27 in the area 200 steplessly or in multiple steps. In the following description, it is assumed that the display of the icons is performed stepwise, and as an example, the enlarged display is performed in three stages. The first detection control unit 51 detects the touched position (coordinates) and detects an icon at this position (coordinates). The control unit 50 can execute the process assigned to this icon.

(Step 1)
A camera image Sk is acquired by the camera 40. By taking the difference with the background image stored in advance, it is possible to obtain the camera image Sk from which the background has been removed. This improves finger detection and area estimation accuracy in the next step.

(Step 2)
The second detection control unit 53 calculates the distance dz between the operation surface 25 and the fingertip of the finger 100. In the camera image Sk, the fingertip is specified by a template matching method using image data such as fingers stored in the storage unit 55 in advance as a template. By using a three-dimensional camera (3D camera) as the camera 40, the coordinates of the specified fingertip can be detected, and the distance dz can be calculated.

(Step 3)
Based on the distance dz between the operation surface 25 and the fingertip 101, the estimation unit 54 estimates an area on the operation surface 25 that the finger 100 intends to operate. Various estimation methods can be used. For example, in the case where the vehicle 8 is the right-hand steering wheel as shown in FIG. 2, it is assumed that the driver operates with the left hand, and the finger 100 tries to operate it as shown in FIG. It is possible to estimate the region 200 on the operation surface 25 to be performed. The second detection control unit 53 detects the fingertip 101 and the back of the hand 102 by a template matching method, and the finger 100 tries to operate based on the three-dimensional coordinates between the fingertip 101 and the center (center of gravity) 103 of the back of the hand. It can also be estimated by calculating the area 200 on the operation surface 25 to be operated. Even a simple estimation method can be used practically by setting a wide enlarged display area in the next step.

(Step 4)
The display control unit 52 enlarges and displays the display image 27 in the area 200 on the operation surface 25 to be operated based on the estimation result in the previous step while reading necessary image data stored in the storage unit 55. To do. In particular, as shown in FIG. 3B, a part of the display image 27 in the region 200 to be operated is enlarged and displayed with the image data 201 in an enlarged state. For example, the enlargement ratio of the enlarged display is changed according to the distance between the operation surface 25 and the fingertip 101 as the detection target. Alternatively, the enlargement ratio is set to be larger as the distance between the operation surface 25 and the fingertip 101 is smaller.

(Step 5)
The first detection control unit 51 acquires the capacitance signal Sc, and determines whether or not a touch operation has been performed based on the acquired capacitance signal Sc. When the touch operation is performed, the process proceeds to Step 6 (Step 5: Yes), and when the touch operation is not performed, the process returns to Step 1 (Step 5: No). The first detection control unit 51 can detect touch (touch) or proximity of a finger on the touch sensor 10 based on a capacitance signal Sc that is a capacitance at a two-dimensional position of the two-dimensional touch sensor. . As shown in FIG. 3C, the first detection control unit 51 can set the coordinates of the center or the center of gravity of the area equal to or greater than the touch threshold as the touch point 210, and the touch point 210, that is, the touch point 210 is It can be determined that the icon to which the user belongs has been touched. Further, the display color of the area to which the touch point 210 belongs can be changed.

(Step 6)
The control unit 50 can execute processing assigned to the touch-operated icon. Thereby, for example, numbers and characters can be input, and in-vehicle devices such as a car navigation device can be operated.

  The above operation can be repeatedly executed as necessary.

(Second embodiment of the present invention)
In the second embodiment, the first detection unit is also used as the second detection unit, and the finger position before the touch is detected by the touch sensor 10 as the first detection unit, and the finger 100 tries to operate it. An area on the operation surface 25 is estimated. Based on this estimation result, the display image 27 in the region on the operation surface 25 to be operated is enlarged and, in particular, a part of the display image 27 in the region to be operated is enlarged and displayed.

  FIG. 5 is an overall configuration diagram of a display input device according to the second embodiment of the present invention. The camera used in the first embodiment is omitted, and the fingertip position before the touch is detected by the touch sensor 10. Hereinafter, a different part from 1st Embodiment is demonstrated.

  FIG. 6A is a diagram showing the positional relationship between the finger and the touch sensor during the operation with the horizontal axis X and the vertical axis Y, and FIG. 6B is the capacitance of the touch sensor in FIG. It is a figure which shows distribution of a value. In FIG. 6B, numerical values are assumed to be the above-mentioned electrostatic capacitance count value normalized with, for example, the maximum value (at the time of touch) as 100, and the area where the numerical value is not described has electrostatic capacitance value of zero. To do.

  The touch sensor 10 is, for example, a capacitive two-dimensional touch sensor that can detect a two-dimensional coordinate corresponding to the display unit 20. Capacitance (mutual capacitance) generated at the intersecting point of the drive electrode and the detection electrode that are arranged to intersect each other constituting the two-dimensional touch sensor is read out. As an example, a capacitance signal Sc is generated as a capacitance count value obtained by performing analog-to-digital conversion processing or the like on the read-out capacitance, and is output to the control unit 50.

  The touch sensor 10 has a resolution capable of selecting and detecting a selection target such as an icon, a button, or a mark in the display image 27 displayed on the display unit 20. In the second embodiment, since the position of the fingertip before touch is detected by the touch sensor 10, the shape of the finger 100 shown in FIG. 6A, the resolution such that the fingertip 101 and the like can be detected are provided. Further, it is preferable to set the detection sensitivity high in order to detect the capacitance when the finger 100 is close to the operation surface 25 without touching it. Although the detection sensitivity can be increased by using the self-capacitance type two-dimensional touch sensor, the touch sensor 10 will be described as a mutual capacitance type two-dimensional touch sensor as in the first embodiment. To do.

  The first detection control unit 51 periodically switches the connection of the detection electrode (not shown) while the drive signal is supplied to one drive electrode (not shown) constituting the two-dimensional touch sensor, A capacitance (mutual capacitance) generated at a point where the drive electrode and the detection electrode that are arranged intersect is read out. As an example, a capacitance signal Sc is generated as a capacitance count value obtained by performing analog / digital conversion processing on the read capacitance, and is output to the control unit 50. Thereby, the electrostatic capacitance in the two-dimensional position of the two-dimensional touch sensor can be detected, and the contact (touch) and proximity of the finger to the touch sensor 10 can be detected. The coordinates of the center or the center of gravity of the area that is equal to or greater than the touch threshold can be used as the touch point.

  In addition, the first detection control unit 51 detects the position of the fingertip 101 before the touch from the distribution of the capacitance signal Sc for the shape of the nearby finger 100. As shown in FIG. 6B, the capacitance is detected according to the shape of the nearby finger 100, and the capacitance closer to the operation surface 25 is detected. In the case shown in FIG. 6 (b), the capacitance is detected large at the coordinates corresponding to the position of the finger 100 shown in FIG. 6 (a), and the capacitances of the other fingers and palm are detected small. The capacitance is zero in the region where 100 is not close.

  The first detection control unit 51 detects coordinates (Xa, Ya) with the largest capacitance as the fingertip position from the detection result shown in FIG. 6B. Further, in FIG. 6B, since the numerical value is the capacitance count value described above normalized with, for example, the maximum value (at the time of touch) being 100, for example, the capacitance value at coordinates (Xa, Ya) From (60), the distance dz between the fingertip 101 and the operation surface 25 can be calculated. In addition, the relationship between the distance dz between the fingertip 101 and the operation surface 25 and the capacitance value is obtained in advance. As described above, the first detection control unit 51 can detect the fingertip position and the distance dz between the fingertip 101 and the operation surface 25 using the touch panel 30.

  The estimation unit 54 may estimate a region on the operation surface 25 that the finger 100 tries to operate, based on the fingertip position and the distance dz between the operation surface 25 and the fingertip 101 obtained as described above. it can. As in the first embodiment, for example, in the case where the vehicle 8 has the right steering wheel as shown in FIG. 2, it is assumed that the driver operates with the left hand, based on the distance dz in FIG. As shown, the region 200 on the operation surface 25 that the finger 100 intends to operate can be estimated.

(Effect of the embodiment)
The embodiment of the present invention has the following effects.
(1) The display input device 1 according to the first embodiment of the present invention includes a touch sensor 10 as a first detection unit that detects an operation state of an object to be detected with respect to the operation surface 25, and a display image on the operation surface 25. 27 controls the operation of the touch sensor 30, the touch sensor 10, and the display unit 20, and the camera 40 as a second detection unit that detects an operation on the operation surface 25. And a control unit 50 including an estimation unit that estimates an area on the operation surface 25 to be operated by the detection target on the basis of the detection information detected by the detection target 40. The control unit 50 includes: Based on the estimation result, the display image 27 in the region is enlarged and displayed. The finger 40 as an object to be detected is imaged by the camera 40 which is a camera device as a second detection unit, and the finger position before the touch is detected based on the imaged detection information, and the finger 100 operates An area on the operation surface 25 to be estimated is estimated. Based on this estimation result, the display image 27 in the region on the operation surface 25 to be operated is enlarged and, in particular, a part of the display image 27 in the region to be operated is enlarged and displayed. This makes it easy to view the icon or the like to be operated before the touch, and the operability can be improved.
(2) In the second embodiment, the first detection unit is also used as the second detection unit, the finger sensor position before the touch is detected by the touch sensor 10 as the first detection unit, and the finger 100 is operated. A region on the operation surface 25 to be estimated is estimated. As a result, the estimation operation and the enlarged display operation can be performed with a simple configuration without using a camera.
(3) Further, the enlarged display can be performed steplessly or steplessly in multiple steps. Thereby, further improvement in operability can be expected.
(4) By applying the display input device 1 according to the present embodiment to a vehicle, it is possible to perform a reliable touch panel operation as intended while operating the handle even in an environment where there is vehicle vibration during driving. .
(5) Also, if you keep your hand close to the touch panel to make continuous touches, it will be partly enlarged and it will be difficult to check the entire drawing. It is possible to prevent long-time operations and driving postures from being broken.

  Although some embodiments of the present invention have been described above, these embodiments are merely examples and do not limit the invention according to the claims. Moreover, these novel embodiments can be implemented in other various forms, and various omissions, replacements, changes, and the like can be made without departing from the scope of the present invention. In addition, not all the combinations of features described in these embodiments are essential to the means for solving the problems of the invention. Furthermore, these embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Display input apparatus, 8 ... Vehicle, 10 ... Touch sensor, 20 ... Display part, 25 ... Operation surface, 27 ... Display image, 28 ... Icon, 30 ... Touch panel, 40 ... Camera, 50 ... Control part, 51 ... Detection Control unit 52: Display control unit 53: Detection control unit 54: Estimation unit 55: Storage unit 81: Instrument panel 82: Room mirror 100: fingers 101: fingertips 102: back of hands 200: 200 Area, 201, 202 ... image data, 210 ... touch point

Claims (5)

A touch panel including a first detection unit that detects an operation state of a detection object on the operation surface, and a display unit that displays a display image on the operation surface;
A second detection unit for detecting an operation operation on the operation surface;
The control unit controls an operation of the first detection unit and the display unit, and estimates an area on the operation surface on which the detection target tends to operate, based on detection information detected by the second detection unit. A control unit including an estimation unit,
The display input device, wherein the control unit enlarges and displays the display image in the area based on the estimation result of the estimation unit.   The display input device according to claim 1, wherein the control unit changes an enlargement ratio of the enlarged display according to a distance between the operation surface and the detection target.   The display input device according to claim 2, wherein the enlargement ratio is set to be larger as the distance between the operation surface and the detection target object is smaller.   4. The display input device according to claim 1, wherein the first detection unit is a capacitive touch sensor, and the second detection unit is a camera device. 5.   The display input device according to any one of claims 1 to 3, wherein the first detection unit and the second detection unit are capacitive touch sensors.

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