JP2018156304A - Touch panel system, method for controlling touch panel system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably use a handwriting drawing function and an eraser function properly even when an electronic pen is used with substantially no inclination from a surface of a touch panel.SOLUTION: When a determination part determines that a position detection part (contact position detection part) detects a contact with a touch panel and a pen holding detection part detects that an electronic pen is held, a display control part (information display part) causes at least one of a handwriting display part (handwriting display part) that displays handwriting at the contact position detected by the position detection part and an information erasing part (information erasing part) that paints over the contact position detected by the position detection part with a background color of the touch panel to function, according to the contact area detected by the position detection part and the angle (inclination) of the electronic pen with respect to the touch panel detected by a pen attitude detection part (attitude detection part).SELECTED DRAWING: Figure 7

Description

  The present invention relates to a touch panel system, a touch panel system control method, and a program.

  Conventionally, an electronic blackboard has been used in which a background image is displayed on a large display in a meeting at a company, educational institution, governmental organization, or the like, and a user can draw stroke images such as letters, numbers, and figures on the background image. ing. In such an interactive whiteboard system, for example, a switch is mounted on the pen tip of the electronic pen, the display is only displayed when the pen tip of the electronic pen is pressed against the touch panel and the switch is turned on. The handwriting is displayed on the top. Furthermore, it is already known that when the interactive whiteboard system detects a contact area of a predetermined value or more, it provides an eraser function that erases information such as handwriting drawn on the display instead of displaying handwriting. It has been.

  However, in such an electronic pen, when writing is performed in a state where the electronic pen is not tilted, that is, in a state where the electronic pen is substantially parallel to the surface of the touch panel, the area where the electronic pen contacts the display increases. Therefore, there is a problem that the eraser function is provided despite the writing, and the writing on the display is erased. For such a problem, calculate the area of the plurality of regions in contact with the display (touch panel) and the distance between the regions, respectively, based on the calculated area of each region and the distance between the regions, There was a technique to use the handwriting drawing function and the eraser function properly.

  However, in this technology, when the electronic pen is brought into contact with the touch panel without being tilted, a region having a contact area exceeding the threshold is generated. That is, when the electronic pen is not tilted, the conventional problem that the eraser function is provided even though the writing operation is performed has not been solved yet.

  The present invention has been made in view of the above, and even when the electronic pen is used in a state where it is hardly tilted from the surface of the touch panel, the handwriting drawing function and the eraser function can be used properly. An object of the present invention is to provide a touch panel system, a touch panel system control method, and a program.

  In order to solve the above-described problems and achieve the object, the present invention provides a touch panel system that displays handwriting of an electronic pen, a grip detection unit that detects that the electronic pen is gripped, and the electronic A posture detection unit that detects the tilt of the pen with respect to the touch panel, a contact position detection unit that detects a contact position and a contact area of the electronic pen with respect to the touch panel, and the contact position detection unit detect contact with the touch panel. When the grip detection unit detects that the electronic pen is gripped, the contact area detected by the contact position detection unit and the tilt of the electronic pen detected by the posture detection unit with respect to the touch panel are detected. And, at least, a handwriting display unit that displays a handwriting at a contact position detected by the contact position detection unit, and the contact position detection unit Characterized in that it comprises an information display unit to function either with the information erasing section to fill the contact position known with the background color of the touch panel, the.

  According to the present invention, the handwriting drawing function and the eraser function can be used properly even when the electronic pen is used in a state where it is hardly tilted from the surface of the touch panel.

FIG. 1 is an external perspective view of an electronic information board system which is an example of a touch panel system. FIG. 2 is a schematic diagram illustrating an example of connection between the electronic information board system and peripheral devices. FIG. 3 is a block diagram showing a control system of the electronic information board system. FIG. 4 is a hardware configuration diagram illustrating an example of a hardware configuration of the electronic information board system. FIG. 5 is a block diagram showing the configuration of the controller of the electronic information board system and its periphery. FIG. 6 is a diagram showing a configuration of a light receiving sensor provided in the electronic information board system. FIG. 7 is a functional configuration diagram illustrating an example of a functional configuration provided for the controller to display information according to the posture of the electronic pen on the display surface. FIG. 8 is a schematic structural diagram showing the internal structure of the electronic pen. FIG. 9 is a diagram illustrating the configuration of the touch panel that detects the coordinate positions of the electronic pen and the shield. FIG. 10 is a diagram illustrating an operation example when the shielding object comes into contact with the display surface. FIG. 11 is a diagram illustrating the amount of light received by the light receiving sensor when the shielding object contacts the display surface. FIG. 12 is a diagram illustrating an operation example of the electronic information board system when the electronic pen is present in the blocking detection mode. FIG. 13 is a diagram illustrating a method in which the electronic information board system performs coordinate detection of the electronic pen in the light-emitting pen detection mode. FIG. 14 is a diagram illustrating the amount of light received by the light receiving sensor when the electronic pen contacts the display surface. FIG. 15 is a diagram illustrating an example of a state in which the electronic pen is brought into contact with the touch panel (display surface) in various postures. FIG. 16 is a diagram for explaining a spatula operation for filling a region through which a contact position of the electronic pen with the touch panel passes with the background color of the touch panel when the electronic pen is moved in a state of being laid sideways on the touch panel. FIG. 17 is a diagram illustrating an example of a determination table used when the electronic information board system determines information to be displayed on the display surface based on the posture of the electronic pen and the contact area of the electronic pen with the touch panel. FIG. 18 is a flowchart illustrating an example of the flow of processing performed by the controller.

(Description of the outline of the electronic information board system)
Hereinafter, an outline of an electronic information board system 10 as an example of a usage pattern of a touch panel system according to an embodiment will be described with reference to the accompanying drawings. FIG. 1 is an external perspective view of an optical touch panel system using an electronic information board system 10 which is an example of a touch panel system. As shown in FIG. 1, the electronic information board system 10 includes a display unit 20, a stand 40, a device storage unit 50, and an electronic pen 100.

  The display unit 20 is formed of a flat panel such as a liquid crystal panel or a plasma panel. The display unit 20 includes a display surface 22 that displays an image on the front surface. A touch panel 24 is laminated on the front surface of the display surface 22. The electronic information board system 10 is written in the coordinate position detected by the touch panel 24 when one end of an electronic pen (light-emitting pen) 100 which is a pen-type input device or a shield 15 described later is brought into contact with the display surface 22. Display characters and figures. The shield 15 is, for example, a human finger. The touch panel 24 described in the present embodiment is described as being based on an optical method, but the touch panel 24 is based on any detection principle such as a capacitance detection method, an electromagnetic induction method, or a resistance change detection method. May be used.

  In the electronic information board system 10, when the pen tip of the electronic pen 100, which is a pen-type input device, contacts the display surface 22, the touch panel 24 detects the coordinate position where the pen tip has contacted. Then, the electronic information board system 10 displays information indicating that the pen tip of the electronic pen 100 is in contact with the detected coordinate position on the display surface 22. Then, when the pen tip of the electronic pen 100 is moved while being in contact with the display surface 22, the handwriting K along the movement locus is displayed on the display surface 22.

  Whether the touch panel 24 is in contact with the pen tip of the electronic pen 100 on the display surface 22, or is the finger of a person who is a shield blocking the light used to detect the contact position on the touch panel 24? Identify The electronic information board system 10 displays the handwriting K when the pen tip comes into contact, and displays predetermined information such as a marker when the finger tip comes into contact.

  Next, the connection between the electronic information board system 10 and peripheral devices will be described with reference to FIG. FIG. 2 is a schematic diagram illustrating an example of connection between the electronic information board system 10 according to the present embodiment and peripheral devices. As shown in FIG. 2, the electronic information board system 10 of the present embodiment is connected to a user PC (Personal Computer) 90 and a network 204 such as the Internet or a LAN (Local Area Network).

  The electronic information board system 10 includes a controller 60 that controls the entire electronic information board system 10, a USB (Universal Serial Bus) socket 72 that interfaces with an external device, and a VGA (Video Graphics Array) input socket 82. .

  The electronic information board system 10 is connected to the user PC 90 via the USB cable 70 connected to the USB socket 72 and the VGA cable 80 connected to the VGA input socket 82. The electronic information board system 10 and the user PC 90 may be connected by cables and connectors based on other communication standards, or by wireless communication.

  The electronic information board system 10 is connected to the network 204 by wireless communication or wired communication via a communication line 200 such as an optical fiber and a network socket 202.

  The user PC 90 includes a control device such as a CPU, a storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory), an external storage device such as an HDD (Hard Disk Drive) and a CD drive device, a display device, and the like. And a hardware configuration of a normal computer including an input device such as a keyboard and a mouse. The user PC 90 is an example of a computer connected to the outside, and may be configured to connect a tablet terminal or the like instead of the user PC 90.

  The user PC 90 has a storage 94 composed of a magnetic disk device or the like. The storage 94 stores programs such as various contents and application software for content display.

  The controller 60 of the electronic information board system 10 controls the entire electronic information board system 10 and controls transmission and reception of data between the user PC 90 connected to the electronic information board system 10 and the network 204. For example, the controller 60 transfers image data selected from the content stored in the storage 94 and displayed on the monitor 92 of the user PC 90 via the USB cable 70 or the VGA cable 80, and displayed on the display unit 20. Display on the surface 22. That is, the same image as the image data displayed on the monitor 92 is displayed on the display surface 22. The controller 60 uses the electronic information board system 10 for a conference between remote locations by connecting to a remote computer via the network 204, for example.

  Further, the controller 60 controls the display surface 22 and the touch panel 24 of the display unit 20. Specifically, the controller 60 acquires the position coordinates of the contact point of the electronic pen 100 detected by the touch panel 24, and displays the handwriting K (FIG. 1) drawn by the user on the display surface 22. Further, when the user performs a screen operation such as pressing each screen operation unit 26 on the display surface 22 with the electronic pen 100, the controller 60 displays the display surface based on the screen operation performed on the touch panel 24 by the user. 22 display is changed.

  The screen operation unit 26 is an operation button displayed on the display surface 22 of the display unit 20. The screen operation unit 26 displays processing that can be executed by the user. The user causes the electronic information board system 10 to perform an operation corresponding to the pressed screen operation unit 26 by pressing the screen operation unit 26 with the electronic pen 100.

  Next, the relationship between the electronic information board system 10 and the electronic pen 100 will be described with reference to FIG. FIG. 3 is a block diagram showing a control system of the electronic information board system 10.

  As shown in FIG. 3, the display unit 20 is controlled by a controller 60, and an image captured from each screen operation unit 26 (FIG. 2) or user PC 90 to be input is displayed on the display surface 22 (FIG. 2). indicate.

  The electronic information board system 10 includes a pen signal receiving unit 210 that transmits and receives signals to and from the electronic pen 100. The electronic pen 100 also includes a communication control unit 102 for transmitting and receiving signals to and from the electronic information board system 10. In addition, in order to improve the usability of the electronic pen 100, it is desirable to perform communication between the communication control unit 102 and the pen signal receiving unit 210 by wireless communication. Therefore, in the present embodiment, communication between the communication control unit 102 and the pen signal receiving unit 210 is performed using Bluetooth (registered trademark), which is a well-known wireless communication standard.

  The controller 60 acquires the position coordinates of the contact point on the touch panel 24 with which the electronic pen 100 has contacted from the touch panel 24.

  In addition, the controller 60 is configured to output the position of a line drawn by the user on the touch panel 24 based on the output of various sensors included in the electronic pen 100 and the position coordinates of the contact point of the electronic pen 100 acquired from the touch panel 24. Etc. are detected. Then, the controller 60 displays a point on the position coordinate on the display surface 22 where the electronic pen 100 is in contact. Further, when the user draws a character or a figure while keeping the electronic pen 100 in contact with the touch panel 24, the controller 60 displays the movement locus of the pen tip of the electronic pen 100 on the display surface 22. Therefore, the handwriting K shown in FIG. 1 is displayed on the display image 22.

(Description of hardware configuration of electronic information board system)
Next, the hardware configuration of the electronic information board system 10 in the present embodiment will be described. FIG. 4 is a hardware configuration diagram illustrating an example of a hardware configuration of the electronic information board system 10.

  As shown in FIG. 4, the controller 60 of the electronic information board system 10 includes a CPU 61, a ROM 63, a RAM 64, and an HDD 65. In the electronic information board system 10, the CPU 61, ROM 63, RAM 64, HDD 65, VGA input socket 82, USB socket 72, pen signal receiving unit 210, display surface 22, and touch panel 24 are connected by a bus 111.

  The CPU 61 of the controller 60 controls processing of the electronic information board system 10 according to a control program stored in the ROM 63.

  The ROM 63 stores a control program executed by the CPU 61. The RAM 64 is used as a working memory when the CPU 61 executes processes.

  The HDD 65 stores various setting values of the electronic information board system 10.

(Description of functional configuration of electronic information board system)
Next, the functional configuration of the electronic information board system 10 will be described with reference to FIG. FIG. 5 is a block diagram showing the configuration of the controller 60 of the electronic information board system 10 and its periphery. As shown in FIG. 5, the controller 60 of the electronic information board system 10 includes a pen signal receiving unit 210, a controller operating system unit 220, an application unit 230, a video input device unit 240, and a touch panel driver unit 250. The application unit 230 includes an event signal determination unit 231, a video input processing unit 232, a screen drawing processing unit 234, a screen erasing processing unit 236, and a screen operation processing unit 238.

  The controller operating system unit 220 is a main control unit that manages and executes control processing performed by the controller 60. The application unit 230 detects a control process for generating an image to be displayed on the display surface 22 (FIG. 2) of the display unit 20, a control process for displaying the screen of the user PC 90, a light emission signal of the electronic pen 100, and finger contact information. In the case of a touch, control processing such as display of written figures and characters, finger touch operation, and the like is performed.

  The event signal determination unit 231 monitors the event signal input from the controller operating system unit 220 and performs control processing according to the input event signal. The video input processing unit 232 performs control processing for displaying an image input from the user PC 90 and displayed on the screen of the user PC 90 on the display surface 22.

  The screen drawing processing unit 234 generates a handwritten graphic based on the coordinate position data input from the touch panel 24 via the event signal determination unit 231 and superimposes the handwritten graphic on the already displayed image. This is displayed on the display surface 22 of the unit 20. By this processing, a so-called handwriting display function is realized. The screen erasure processing unit 236 generates a graphic with the background color of the currently displayed image based on the coordinate position data input from the touch panel 24 via the event signal determination unit 231, and creates an already displayed image. The background color graphic is superimposed and displayed on the display surface 22 of the display unit 20. By this process, the background color graphic is superimposed on the handwritten graphic displayed on the display unit 20, so that a so-called eraser function in which the handwritten graphic is apparently erased from the display surface 22 is realized.

  The screen operation processing unit 238 converts the coordinate position information (signal) input from the touch panel 24 into a pointing device signal such as a mouse event and is displayed on the display surface 22 of the display unit 20 (see FIG. The processing by the on / off operation of 2) is performed. In addition, the screen operation processing unit 238 uses the controller operating system as a mouse down event together with the coordinate value information of the coordinate position of the touch panel 24 touched by the electronic pen 100 detected by the light receiving sensors 300 and 310 (FIG. 6) described later. To the unit 220. Further, when the electronic pen 100 is moved while being in contact with the display surface 22 of the touch panel 24, it is transmitted to the controller operating system unit 220 together with the coordinate value as a mouse up event.

  The video input device unit 240 transfers the image data displayed on the monitor 92 of the user PC 90 via, for example, the VGA cable 80 (FIG. 3) and displays it on the display surface 22 of the display unit 20.

  The touch panel driver unit 250 converts the coordinate position signal and the writing detection signal or the erasure detection signal input from the electronic pen 100 and the touch panel 24 into predetermined event signals and transmits them to the controller operating system unit 220. Further, when the pen signal receiving unit 210 receives a writing detection signal or an erasure detection signal from the electronic pen 100, the touch panel driver unit 250 transmits the writing detection signal or the erasure detection signal together with the coordinate position signal to the controller operating system unit 220. To do.

(Explanation of operation summary of touch panel)
Next, an outline of the operation of the touch panel 24 will be described with reference to the drawings. FIG. 6 is a diagram illustrating a configuration of the light receiving sensor 300 provided in the electronic information board system 10. The light receiving sensor 300 includes, for example, a light receiving lens 350 that transmits infrared light and an image sensor substrate 352. The light receiving sensor 300 receives light (for example, infrared light) emitted from an illumination light source 410 described later. In addition, the light receiving sensor 310 (not shown in FIG. 6) is configured similarly to the light receiving sensor 300. The operation of the light receiving sensor 300 (light receiving sensor 310) will be described later.

  FIG. 7 is a block diagram showing an outline of functions provided for the controller 60 to display an image on the display surface 22 in accordance with the posture of the electronic pen 100 (and the shielding object 15). As shown in FIG. 7, the controller 60 displays a signal on the display surface 22 in accordance with the posture of the electronic pen 100 (and the shield 15), a signal detection unit 600, a pen posture detection unit 602, a pen grip detection. A unit 603, a position detection unit 604, a determination unit 606, and a display control unit 608.

  The signal detection unit 600 detects an optical signal via the electronic pen 100 or the shielding object 15 via the light receiving sensor 300. The pen posture detection unit 602 is an example of a posture detection unit, and detects the posture of the electronic pen 100 with respect to the touch panel 24. In the present embodiment, the posture sensor 108 (FIG. 8) described later cooperates with the controller 60 to realize the pen posture detection unit 602. The pen grip detection unit 603 is an example of a grip detection unit, and detects whether the user is gripping the electronic pen 100. In the present embodiment, the grip sensor 106 described later cooperates with the controller 60 to realize the pen grip detection unit 603. The position detection unit 604 is an example of a contact position detection unit, and detects the position and contact area on the touch panel 24 of the electronic pen 100 or the shielding object 15. In the present embodiment, the touch panel 24 cooperates with the controller 60 to realize the position detection unit 604.

  The determination unit 606 determines whether the optical signal detected by the signal detection unit 600 is an optical signal through the electronic pen 100 or the shield 15. Further, the determination unit 606 determines the order in which the optical signal detected by the signal detection unit 600 is an optical signal via the electronic pen 100 or the shielding object 15, and the posture signal detected by the pen posture detection unit 602. And the grip signal detected by the pen grip detection unit 603, the state of the electronic pen 100, that is, whether the electronic pen 100 is gripped and a writing operation is performed, or the electronic pen 100 is gripped and the writing operation is performed. It is determined whether or not the erasing operation is performed or whether the electronic pen 100 is held and the erasing operation is performed by the spatula operation.

  Based on the determination result of the determination unit 606, the display control unit 608 displays a handwriting K, a marker, or the like at a predetermined position based on the position of the electronic pen 100 or the shield 15 detected by the position detection unit 604. The display control unit 608 further includes a handwriting display unit 610 and an information erasing unit 611.

  The handwriting display unit 610 displays the handwriting K at the contact position on the touch panel 24 (display surface 22) when the determination unit 606 determines that the user is performing a writing operation using the handwriting display function. The handwriting display unit 610 displays a marker or the like at a position corresponding to the coordinate position on the display surface 22 detected by the position detection unit 604 when a finger event has occurred. When the determining unit 606 determines that the user is performing an erasing operation using the eraser function, the information erasing unit 611 fills the contact position of the touch panel 24 (display surface 22) with the background color. In addition, the information erasing unit 611 uses the background color to indicate the area through which the electronic pen 100 has passed on the touch panel 24 (display surface 22) when the determining unit 606 determines that the user is performing an erasing operation with a spatula operation. Fill.

  Next, the internal structure of the electronic pen 100 will be described with reference to FIG. FIG. 8 is a schematic structural diagram showing the internal structure of the electronic pen 100. As shown in FIG. 8, the electronic pen 100 has a cylindrical shape and has a tip that is squeezed into a convex shape toward the pen tip 101. The tip of the electronic pen 100 is formed of a light-transmitting member and includes a light emitting unit 103 inside. Furthermore, the electronic pen 100 includes a grip sensor 106 that detects that the user has gripped the electronic pen 100 and a posture sensor 108 that detects the posture of the electronic pen 100 with respect to the touch panel 24. In addition, the electronic pen 100 includes a signal processing circuit 105 that processes detection signals output from the sensors, a light emitting unit 103, a battery 107 that supplies power to the sensors and the signal processing circuit 105, and an electronic information board. The communication control part 102 which transmits / receives a signal between the pen signal receiving parts 210 (FIG. 5) with which the system 10 is provided is provided.

  The light emitting unit 103 is provided at the tip of the electronic pen 100 and emits light having a wavelength that can be detected by the light receiving sensors 300 and 310.

  The grip sensor 106 is constituted by a pressure sensor using pressure-sensitive conductive rubber, for example. Specifically, the grip sensor 106 is configured by winding pressure-sensitive conductive rubber along the side surface of the electronic pen 100. When the user grips the electronic pen 100, the fingertip contacts the grip sensor 106, so that the resistance value of the grip sensor 106 changes according to the grip force, and an electric signal (grip signal) corresponding to the resistance value is output. More specifically, the electrical resistance decreases as the gripping force increases. Therefore, when the user grips the electronic pen 100, the current flowing through the grip sensor 106 increases. By detecting this change in current value, it is possible to detect that the electronic pen 100 has been gripped. The configuration of the grip sensor 106 is not limited to a pressure sensor using pressure-sensitive conductive rubber, and may be, for example, a sensor that detects a change in capacitance due to gripping. The grip signal output from the grip sensor 106 is subjected to signal processing such as amplification in the signal processing circuit 105 and transmitted to the controller 60 via the communication control unit 102 and the pen signal receiving unit 210.

  It is assumed that the electronic pen 100 is left on the desk without being gripped. Even in such a case, since the grip sensor 106 is in contact with the desk, the electrical resistance is reduced and an electrical signal is output. Here, it is assumed that the resolution of the output signal of the grip sensor 106 is 256 steps (8 bits). At this time, for example, a substantially constant value of about 30 is output from the grip sensor 106 of the electronic pen 100 left on the desk while lying down. Therefore, in the electronic information board system 10 of the present embodiment, when the grip sensor 106 continues to output a value of 20 to 40 for a predetermined time (for example, 2 seconds), the electronic pen 100 is gripped by the user's hand. Judge that it is not. For example, when the grip sensor 106 continues to output a value of 20 to 40 for a predetermined time, the controller 60 temporarily outputs a value corresponding to that during writing. Even so, it is determined that the electronic pen 100 is left in the posture indicated by the value of the posture sensor 108.

  The posture sensor 108 is constituted by, for example, a gyro sensor that is well known as a sensor that detects angular velocity. The posture sensor 108 detects the posture of the electronic pen 100 when the user holds the electronic pen 100 and performs a writing operation. In the present embodiment, the posture sensor 108 outputs an electrical signal (posture signal) corresponding to an angle θ corresponding to the inclination that the electronic pen 100 makes with the surface of the touch panel 24, as shown in FIG. Output. The configuration of the attitude sensor 108 is not limited to the gyro sensor, and may be configured using an acceleration sensor, for example. The posture signal output from the posture sensor 108 is subjected to signal processing such as amplification in the signal processing circuit 105, and is transmitted to the controller 60 via the communication control unit 102 and the pen signal receiving unit 210. The posture sensor 108 detects the posture of the electronic pen 100 and outputs a posture signal even when the electronic pen 100 is not held by the user. Therefore, the controller 60 of the electronic information board system 10 combines the optical signal that is the output of the light receiving sensors 300 and 310, the grip signal that is the output of the grip sensor 106, and the posture signal that is the output of the posture sensor 108, The state of the electronic pen 100 and the finger (shield) is determined. Details will be described later (FIG. 18).

  In order to reduce the consumption of the battery 107, the electronic pen 100 may be provided with a power switch (not shown in FIG. 8) so that the user can turn on the power switch when using the electronic pen 100. Good. Alternatively, for example, only the posture sensor 108 and the signal processing circuit 105 may be energized at all times, and the grip sensor 106 and the like may be energized only when the output of the posture sensor 108 exceeds a predetermined value.

  FIG. 9 is a diagram illustrating the configuration of the touch panel 24 that detects the coordinate positions of the electronic pen 100 and the shield 15. As shown in FIG. 9, the touch panel 24 has a pair of light receiving sensors 300 and 310 arranged at the left and right corners on the upper side of the display surface 22. The light receiving sensors 300 and 310 are respectively provided with illumination light sources 410 and 420 that irradiate light having a wavelength that can be detected by the light receiving sensors 300 and 310 (for example, infrared light). In addition, a retroreflective portion 430 is disposed on the side surface side and below the display surface 22.

  A light beam is emitted from the illumination light source 410 onto the display surface 22. A portion of the light beam is shown as light beam 440. The light beam emitted from the illumination light source 410 is reflected by the retroreflecting unit 430 and reaches the light receiving sensor 300. A part of the light beam reflected from the retroreflecting unit is shown as a light beam 450. Similarly, a light beam is emitted from the illumination light source 420 onto the display surface 22. A portion of the light beam is shown as light beam 460. The light beam emitted from the illumination light source 420 is reflected by the retroreflecting unit 430 and reaches the light receiving sensor 310. A part of the light beam reflected from the retroreflecting unit 430 is shown as a light beam 470.

  Since the tip of the electronic pen 100 has translucency as described above, it transmits the light rays from the illumination light sources 410 and 420 and the retroreflecting unit 430. Further, the light emitting unit 103 installed at the tip of the electronic pen 100 emits light according to an instruction from the control circuit 62. Light rays emitted from the light emitting unit 103 are received by the light receiving sensors 300 and 310, and the wavelength, intensity, and the like are detected. The communication control unit 102 communicates with a communication unit included in the control circuit 62. The control circuit 62 is included in the controller 60 described above.

  The touch panel 24 includes a blocking detection mode for detecting the coordinate position where the shielding object 15 such as a finger is in contact, and a light emitting pen detection mode for detecting the coordinate position where the electronic pen 100 is in contact. In the blocking detection mode, the illumination light sources 410 and 420 are turned on, and the light emitting unit 103 of the electronic pen 100 is turned off. Then, the light receiving sensors 300 and 310 detect the position where the amount of received light is minimized, and calculate inclination angles α and β (FIG. 10) described later based on the detection result. In the light emitting pen detection mode, the illumination light sources 410 and 420 are turned off, and the light emitting unit 103 of the electronic pen 100 is turned on. Then, the light receiving sensors 300 and 310 detect the position where the amount of received light becomes maximum, and calculate inclination angles α and β (FIG. 13) described later based on the detection result. When the operation of the touch panel 24 starts, it is uncertain which mode to operate. For example, by switching the both modes at a predetermined timing according to an instruction from the control circuit 62, it is specified which mode should be operated. Then, the operation may be performed in the specified mode. Hereinafter, an outline of the operation in each mode will be described.

  Next, the principle that the electronic information board system 10 detects the position coordinates of the shield (non-light emitting body) 15 will be described. FIG. 10 is a diagram illustrating an operation example when the shielding object 15 comes into contact with the display surface 22. The electronic information board system 10 turns on the illumination light sources 410 and 420 according to an instruction from the control circuit 62.

  When the tip of the shield 15 comes into contact with the display surface 22, the light rays 440 and 460 are blocked by the shield 15. Therefore, the light beams 450 and 470 shown in FIG. 10 are not detected by the light receiving sensors 300 and 310. Therefore, the control circuit 62 detects the inclination angle (α, β) with respect to the horizontal direction of the portion where the infrared light is not detected based on the optical signals from the light receiving sensors 300 and 310, and the coordinate position is expressed by a triangulation formula. Is converted into XY coordinates. Then, the electronic information board system 10 displays characters, figures, and the like written on the basis of the coordinate position obtained by the control circuit 62 on the display unit 20. FIG. 11 shows an example of the received light amount I of the light receiving sensors 300 and 310 when the shield 15 comes into contact with the display surface 22 in the method shown in FIG.

  FIG. 12 is a diagram illustrating an operation example of the electronic information board system 10 when the electronic pen 100 is present in the blocking detection mode. In this case, the light emitting unit 103 is turned off from the control circuit 62 via the communication control unit 102. In addition, since the tip of the electronic pen 100 has translucency, the light emitted from the illumination light sources 410 and 420 is transmitted. Therefore, the electronic pen 100 is not detected by the light receiving sensors 300 and 310, and does not affect the detection of the coordinate position of the shielding object 15. As described above, in the blocking detection mode, it is possible to detect contact of only the shielding object 15 with the display surface 22.

  Next, the principle that the electronic information board system 10 detects the position coordinates of the electronic pen 100 will be described. FIG. 13 is a diagram illustrating a method in which the electronic information board system 10 detects the coordinates of the electronic pen 100 in the light emitting pen detection mode. In the light emitting pen detection mode, the illumination light sources 410 and 420 are turned off according to an instruction from the control circuit 62 and the light emitting unit 103 of the electronic pen 100 is turned on only when the pen tip 101 contacts the display surface 22. Therefore, only the light beams 480 and 490 irradiated by the light emitting unit 103 enter the light receiving sensors 300 and 310 and are detected.

  Therefore, the control circuit 62 detects the inclination angle (α, β) with respect to the horizontal direction of the location where the infrared light is detected based on the optical signals from the light receiving sensors 300 and 310, and calculates the coordinate position using a triangulation formula. And converted to XY coordinates. Then, the electronic information board system 10 displays characters, figures, and the like written on the basis of the coordinate position obtained by the control circuit 62 on the display unit 20.

  FIG. 14 shows an example of the received light amount I of the light receiving sensors 300 and 310 when the electronic pen 100 contacts the display surface 22 in the method shown in FIG. When the shielding object 15 is present in the light emitting pen detection mode, the illumination light sources 410 and 420 are turned off and are not irradiated with light, and thus are not detected by the light receiving sensors 300 and 310. As described above, in the light emitting pen detection mode, it is possible to detect contact of only the electronic pen 100 with the display surface 22.

(Description of posture of electronic pen)
Next, the posture of the electronic pen 100 will be described with reference to FIG. FIG. 15 is a diagram illustrating an example of a state in which the electronic pen 100 is brought into contact with the touch panel 24 (display surface 22) in various postures. FIG. 15A shows a state where the axis S of the electronic pen 100 is in a state (θ = 90 °) perpendicular to the surface of the touch panel 24 and the pen tip 101 is in contact with the touch panel 24. FIG. 15B shows the state in which the axis S of the electronic pen 100 is inclined by an angle θ = θ1 with respect to the surface of the touch panel 24 and contacts the touch panel 24 from the pen tip 101 of the electronic pen 100 to the abdomen. It shows how it is. FIG. 15C shows a state in which the axis S of the electronic pen 100 is inclined with respect to the surface of the touch panel 24 by an angle θ = θ2. In FIG. 15C, the pen tip 101 is in contact with the touch panel 24, but when the electronic pen 100 is further tilted, the pen tip 101 is in a critical state where it is separated from the surface of the touch panel 24. FIG. 15D shows a state in which the electronic pen 100 is in a laid-down state on the touch panel 24. At this time, the axis S of the electronic pen 100 is parallel to the surface of the touch panel 24. That is, the angle θ = 0 °. The pen tip 101 and the abdomen of the pen tip 101 do not contact the touch panel 24, and the side surface portion of the electronic pen 100 contacts the touch panel 24.

  15, the contact area P between the electronic pen 100 and the touch panel 24 is P = x1 in the case of FIG. 15A, P = x2 in the case of FIG. 15B, and FIG. 15C. P = x3, and in the case of FIG. 15D, P = x4.

  When the contact areas P described above are compared, generally, x1 <x2 <x3 <x4. That is, if the angle θ of the electronic pen 100 is known, the contact area P when the electronic pen 100 is brought into contact with the touch panel 24 at that time can be estimated.

  The value of the angle θ is measured by the attitude sensor 108 (FIG. 8). The electronic information board system 10 according to the present embodiment can maintain the contact of the pen tip 101 with the touch panel 24 when the angle θ is changed in a state where the pen tip 101 of the electronic pen 100 is in contact with the touch panel 24. Display detected by the touch panel 24 when the posture of the electronic pen 100 is within an angle range of 20 ° ≦ θ ≦ 160 ° (180 ° −20 °) with the critical angle θ2 (for example, 20 °) as a threshold. A handwriting drawing function for drawing the handwriting K shown in FIG. 1 is realized at the coordinate position on the surface 22 where the electronic pen 100 is in contact. That is, even when the pen tip 101 of the electronic pen 100 is not in contact with the touch panel 24 as shown in FIG.

  Based on the attitude of the electronic pen 100 described above, the electronic information board system 10 according to the present embodiment draws the handwriting K on the display surface 22 when all of the following conditions are satisfied. The first condition is that the grip sensor 106 determines that the electronic pen 100 is gripped. The second condition is that the posture sensor 108 detects that the angle θ of the electronic pen 100 is within a range of 20 ° ≦ θ ≦ 160 °. The third condition is when the touch panel 24 detects the contact of the electronic pen 100 with the display surface 22. When all three conditions are satisfied, the electronic information board system 10 draws the handwriting K at a position corresponding to the coordinate position on the display surface 22 detected by the touch panel 24.

  Therefore, in the electronic information board system 10, for example, when the electronic pen 100 is stored in a predetermined pen holder stored in an attitude θ = 0 °, and the touch panel 24 is touched with a finger, the electronic pen 100 The pen 100 is not used, it is determined that a finger event has occurred, and information corresponding to the finger input (for example, a predetermined marker or the like) is displayed on the display surface 22.

(Explanation of spatula operation with electronic pen)
Next, the spatula operation by the electronic pen 100 will be described with reference to FIG. FIG. 16A shows a contact position of the electronic pen 100 with respect to the touch panel 24 when the electronic pen 100 is moved on the touch panel 24 in a state where the electronic pen 100 is brought into contact with the touch panel 24 in a sideways state (angle θ = 0 °). It is a figure explaining the spatula operation | movement which fills the area | region which passed through with the background color of the touch panel 24 (display surface 22). FIG. 16B is a diagram illustrating that the side surface (outer peripheral surface) of the electronic pen 100 is in contact with the touch panel 24.

  As shown in FIGS. 16A and 16B, when the electronic pen 100 is laid down and brought into contact with the touch panel 24, the attitude sensor 108 (FIG. 8) sets the angle θ of the electronic pen 100 to θ = 0 °. It is calculated that The grip sensor 106 determines that the electronic pen 100 is gripped. Then, the touch panel 24 detects that the electronic pen 100 is in contact with the touch panel 24 with a contact area P = x4 (FIG. 15D). Based on these pieces of information, the controller 60 (FIG. 5) determines that the electronic pen 100 is gripped and is in contact with the touch panel 24 while lying down. Then, when the electronic pen 100 is moved sideways along the arrow E shown in FIG. 16A, the controller 60 is an area formed by the outer peripheral surface of the electronic pen 100 contacting the touch panel 24. 110 is filled with the background color of the touch panel 24 (display surface 22). By this filling process, the information drawn on the display surface 22 is erased as if it were erased with an eraser. In other words, the electronic pen 100 realizes an eraser function (a spatula function) by a spatula operation.

(Explanation of operation content judgment process based on electronic pen posture and contact area)
Next, an operation content determination process performed by the electronic information board system 10 based on the posture of the electronic pen 100 and the contact area with the touch panel 24 will be described with reference to FIG. FIG. 17 is used when the electronic information board system 10 determines information to be displayed on the display surface 22 based on the posture (angle θ) of the electronic pen 100 and the contact area P of the electronic pen 100 with respect to the touch panel 24. 4 is a diagram illustrating an example of a determination table T. FIG. Note that the determination table T illustrated in FIG. 17 is for the case where the grip sensor 106 determines that the electronic pen 100 is being gripped.

  The horizontal axis in FIG. 17 indicates the angle θ that is the posture of the electronic pen 100 with respect to the touch panel 24. 17 indicates the contact area P of the electronic pen 100 with respect to the touch panel 24.

  As described above, the relationship between the angle θ, which is the posture of the electronic pen 100, and the contact area P with respect to the touch panel 24 is as shown in FIG. 17 in the range of θ ≦ 90 ° according to the decrease of the angle θ. The area P increases monotonously. On the other hand, in the range of θ ≧ 90 °, the contact area P increases monotonously as the angle θ increases. Note that a point Q1 illustrated in FIG. 17 indicates that the electronic pen 100 is in the state illustrated in FIG. Further, the point Q2 indicates that the electronic pen 100 is in the state of FIG. 15B, and the point Q3 indicates that the electronic pen 100 is in the state of FIG. The point Q4 indicates that the electronic pen 100 is in the state shown in FIG.

  The shape of the curve C1 connecting the points Q1, Q2, and Q3 in the range of θ ≦ 90 ° and the shape of the curve C2 in the range of θ ≧ 90 ° are symmetrical with respect to the position of θ = 90 °. . The shapes of the curves C1 and C2 are determined by the cross-sectional shape of the pen tip 101 of the electronic pen 100 and the abdomen of the pen tip 101.

  In FIG. 17, a curve C1, a straight line L1 indicating an angle θ2, and a straight line L2 indicating a contact area P = x1 form a region R1a. Further, the curve C2, the straight line L3 indicating the angle 180 ° −θ2, and the straight line L2 form a region R1b. When the electronic pen 100 is in these regions R1a and R1b, the controller 60 writes the handwriting K by the pen tip 101 of the electronic pen 100 or the abdomen of the pen tip 101 being pressed against the touch panel 24. Is determined to have been performed. The electronic information board system 10 implements a handwriting display function.

  In FIG. 17, a curve C1, a curve C2, a straight line L1, and a straight line L3 form a region R2. When the electronic pen 100 is in the region R <b> 2, the controller 60 performs a writing operation on the display surface of the electronic pen 100 pressed against the touch panel 24 or the region where the abdomen of the pen tip 101 is in contact with the display surface. It is determined that the information displayed on 22 has been erased. And the electronic information board system 10 implement | achieves the eraser function by writing operation | movement. Note that the value of the contact area P that is determined to be performing the erasing operation differs depending on the angle θ of the electronic pen 100. Specifically, as the angle θ is further away from 90 ° toward the larger side or the smaller side, the threshold value of the contact area P (threshold value Pth described later) for determining that erasing by writing operation is being performed increases.

  Furthermore, in FIG. 17, the straight line L1, the straight line L2, and the straight line indicating θ = 0 ° form a region R3a. Further, the straight line L3, the straight line L2, and the straight line indicating θ = 180 ° form a region R3b. When the posture of the electronic pen 100 is in these regions R3a and R3b, the electronic information board system 10 realizes an eraser function by the above-described spatula operation.

  In FIG. 17, a region R4 having a contact area P smaller than the straight line L2, that is, a region where the touch area P is smaller than P = x1 when the touch panel 24 detects contact is normally generated. do not do.

  The controller 60 of the electronic information board system 10 in this embodiment stores the ranges of the respective regions R1a, R1b, R2, R3a, R3b, and R4 as the determination table T in the determination unit 606 (FIG. 7). doing. The controller 60 then determines which combination of the angle θ and the contact area P in the determination table T is based on the angle θ of the electronic pen 100 based on the output of the attitude sensor 108 and the contact area P detected by the touch panel 24. Determine if it belongs to the region. Further, the controller 60 outputs information corresponding to the determination result of the determination unit 606 to the display surface 22, thereby realizing any of the handwriting drawing function, the eraser function by the writing operation, and the eraser function by the spatula operation.

(Description of the flow of processing performed by the controller)
Next, the flow of processing performed by the controller 60 will be described with reference to FIG. FIG. 18 is a flowchart illustrating an example of the flow of processing performed by the controller 60.

  In the electronic information board system 10, when the power is turned on (step S10), each function including the touch panel 24 is activated (step S12).

  The determination unit 606 (FIG. 7) determines whether the signal detection unit 600 detects an event signal after the touch panel 24 is activated (step S14). When it is determined that an event signal is detected (step S14: Yes), the process proceeds to step S16. When it is not determined that an event signal is detected (step S14: No), the process proceeds to step S42. To do.

  The determination unit 606 determines whether the electronic pen 100 is held based on the grip signal detected by the pen grip detection unit 603 (FIG. 7) (step S16). When it is determined that the electronic pen 100 is held (step S16: Yes), the process proceeds to step S18, and when it is not determined that the electronic pen 100 is held (step S16: No), the process proceeds to step S34. Transition.

  The pen posture detection unit 602 (FIG. 7) detects the angle θ (FIG. 15) as the inclination of the electronic pen 100 with respect to the touch panel 24 (step S18).

  The determination unit 606 determines whether the angle θ detected in step S18 is equal to or larger than θ2 and equal to or smaller than 180 ° −θ2 (step S20). When it is determined that the angle θ is equal to or larger than θ2 and equal to or smaller than 180 ° −θ2 (step S20: Yes), the process proceeds to step S22. On the other hand, when it is not determined that the angle θ is not less than θ2 and not more than 180 ° −θ2 (step S20: No), the process proceeds to step S32.

  The determination unit 606 sets a threshold value Pth of the contact area P according to the angle θ detected in step S18 (step S22). Specifically, the determination unit 606 sets the contact area P indicated by the points on the curves C1 and C2 (FIG. 17) corresponding to the angle θ as the threshold value Pth.

  The determination unit 606 reads the contact area P detected by the position detection unit 604 from the position detection unit 604 (step S24).

  The determination unit 606 compares the contact area P read in step S24 with the threshold value Pth set in step S22, and determines whether P ≧ Pth (step S26). When it is determined that P ≧ Pth (step S26: Yes), the process proceeds to step S28. On the other hand, when it is not determined that P ≧ Pth (step S26: No), the process proceeds to step S30.

  In step S26, when P ≧ Pth (step S26: Yes), the information erasing unit 611 realizes an eraser function by a writing operation so that the pen tip 101 of the electronic pen 100 or the abdomen of the pen tip 101 passes. The position is filled with the background color of the display surface 22 (step S28). Thereafter, the process proceeds to step S42.

  In step S26, when P ≧ Pth is not satisfied (step S26: No), the handwriting display unit 610 realizes the handwriting drawing function, and the pen tip 101 of the electronic pen 100 or the abdomen of the pen tip 101 has passed. The handwriting K is displayed (step S30). Thereafter, the process proceeds to step S42.

  In step S20, when it is not determined that the angle θ is equal to or larger than θ2 and equal to or smaller than 180 ° −θ2 (step S20: No), the information erasing unit 611 realizes an eraser function by a spatula operation and is laid down. The area through which the outer peripheral surface of the electronic pen 100 has passed is filled with the background color of the display surface 22 (step S32). Thereafter, the process proceeds to step S42.

  In step S16, when it is not determined that the electronic pen 100 is held (step S16: No), the determination unit 606 reads the contact area P detected by the position detection unit 604 from the position detection unit 604 (step S34). ).

  The determination unit 606 determines whether or not the contact area P is greater than or equal to a preset threshold value Po (step S36). And when it determines with it being P> = Po (step S36: Yes), it transfers to step S38. On the other hand, when it is not determined that P ≧ Po (step S36: No), the process proceeds to step S40.

  When it is determined in step S36 that P ≧ Po (step S36: Yes), the information erasing unit 611 executes the eraser function and fills the coordinate position where the contact is detected with the background color of the display surface 22. (Step S38). Thereafter, the process proceeds to step S42.

  On the other hand, when it is not determined in step S36 that P ≧ Po (step S36: No), the handwriting display unit 610 executes the marker function to correspond to the movement of the coordinate position at which contact is detected on the display surface 22. A marker or the like to be displayed is displayed (step S40). Thereafter, the process proceeds to step S42.

  Subsequently, it is determined whether or not the electronic information board system 10 has been powered off (step S42). When it is determined that the power is turned off (step S42: Yes), the series of processes shown in FIG. 18 is terminated. On the other hand, when it is not determined that the power has been cut off (step S42: No), the process returns to step S14 and the above-described processing is repeated.

  As described above, according to the electronic information board system 10 which is an example of the touch panel system according to the present embodiment, the determination unit 606 detects the contact with the touch panel 24 by the position detection unit 604 (contact position detection unit). When the pen grip detection unit 603 (grip detection unit) determines that the electronic pen 100 is gripped, the display control unit 608 (information display unit) detects the contact detected by the position detection unit 604. In accordance with the area P and the angle θ (inclination) of the electronic pen 100 with respect to the touch panel 24 detected by the pen posture detection unit 602 (posture detection unit), the handwriting K is at least at the contact position detected by the position detection unit 604. A handwriting display unit 610 (handwriting display unit) to be displayed and an information erasing unit 611 that paints the contact position detected by the position detection unit 604 with the background color of the touch panel 24. An information erasing section) to function either. Therefore, the handwriting drawing function and the eraser function by the electronic pen 100 can be used properly.

  Further, according to the electronic information board system 10 according to the present embodiment, the display control unit 608 provides that the angle θ of the electronic pen 100 is within a predetermined angle range (θ2 ≦ θ ≦ 180 ° −θ2). As described above, when the contact area P is equal to or greater than the threshold value Pth corresponding to the angle θ, the information erasing unit 611 is caused to function, and when the contact area P is less than the threshold value Pth, the handwriting display unit 610 is caused to function. Therefore, even when the electronic pen 100 is tilted down (when the electronic pen 100 is hardly tilted from the surface of the touch panel 24), the handwriting drawing function and the eraser function performed by the same writing operation can be used properly. .

  In the electronic information board system 10 according to the present embodiment, the threshold value Pth is set to a value that increases as the electronic pen 100 is tilted with respect to the touch panel 24. Therefore, even when the electronic pen 100 is tilted, the contact of the electronic pen 100 is not erroneously determined as the eraser function. Therefore, the handwriting drawing function and the eraser function performed by the same writing operation can be used more reliably.

  Furthermore, according to the electronic information board system 10 according to the present embodiment, the information erasing unit 611 is configured such that the angle θ of the electronic pen 100 is outside a predetermined angle range (0 ° ≦ θ <θ2 or 180 ° −θ2 <θ ≦ 180 °), and the area where the outer peripheral surface of the electronic pen 100 is in contact with the touch panel 24 when the electronic pen 100 is laid down on the touch panel 24 on the condition that the electronic pen 100 is gripped. A spatula operation for painting with the background color of the touch panel 24 is realized. Therefore, information drawn over a wide area can be erased with a simple operation.

  Further, according to the electronic information board system 10 according to the present embodiment, the predetermined angle θ2 described above is obtained when the angle θ is changed when the pen tip 101 of the electronic pen 100 is in contact with the touch panel 24. This is the critical angle at which the contact of the tip 101 with the touch panel 24 can be maintained. Therefore, it can be easily determined that the spatula operation is in a functioning state.

  Although the embodiments of the present invention have been described above, the above-described embodiments are presented as examples, and are not intended to limit the scope of the present invention. This novel embodiment can be implemented in various other forms. Various omissions, replacements, and changes can be made without departing from the scope of the invention. Further, this embodiment is included in the scope and gist of the invention, and is included in the invention described in the claims and the equivalent scope thereof.

  For example, the control program described in the embodiment is stored in the ROM 63 in advance and provided as a file in an installable or executable format, such as a CD-ROM, a flexible disk (FD), a CD-R. The recording medium may be recorded on a computer-readable recording medium such as a DVD (Digital Versatile Disc). Furthermore, the control program may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. The control program may be provided or distributed via a network such as the Internet.

10 Electronic information board system (touch panel system)
22 Display surface 24 Touch panel 100 Electronic pen 101 Pen tip 300, 310 Light receiving sensor 600 Signal detection unit 602 Pen posture detection unit (posture detection unit)
603 Pen grip detection unit (grip detection unit)
604 position detection unit 606 determination unit 608 display control unit (information display unit)
610 Handwriting display part (handwriting display part)
611 Information erasure unit (information erasure unit)
K Handwriting θ, θ1, θ2 Angle (tilt)

Japanese Patent Laid-Open No. 2015-32264

Claims (7)

A touch panel system for displaying handwriting of an electronic pen,
A grip detection unit that detects that the electronic pen is gripped;
An attitude detection unit that detects an inclination of the electronic pen with respect to the touch panel;
A contact position detector for detecting a contact position and a contact area of the electronic pen with respect to the touch panel;
When the contact position detection unit detects contact with the touch panel and the grip detection unit detects that the electronic pen is gripped, the contact area detected by the contact position detection unit, and According to the inclination of the electronic pen with respect to the touch panel detected by the posture detection unit,
At least one of a handwriting display unit that displays a handwriting at the contact position detected by the contact position detection unit and an information erasing unit that paints the contact position detected by the contact position detection unit with the background color of the touch panel An information display section to be
A touch panel system comprising: The information display unit, on the condition that the tilt of the electronic pen is within a predetermined angle range,
When the contact area is equal to or greater than a threshold corresponding to the inclination, the information erasing unit is caused to function,
The touch panel system according to claim 1, wherein the handwriting display unit is caused to function when the contact area is less than the threshold value. The touch panel system according to claim 2, wherein the threshold value is set to a larger value as the electronic pen is tilted with respect to the touch panel. The information erasing unit is provided on the condition that the tilt of the electronic pen is out of the predetermined angle range and the electronic pen is gripped.
4. The area where the outer peripheral surface of the electronic pen is in contact with the touch panel when the electronic pen is placed on the touch panel is filled with the background color of the touch panel. The touch panel system described. The predetermined angle is an angle in a critical state in which contact of the pen tip with the touch panel can be maintained when the inclination is changed in a state where the pen tip of the electronic pen is in contact with the touch panel. The touch panel system according to any one of claims 2 to 4. A control method of a touch panel system for displaying handwriting of an electronic pen,
A grip detection step for detecting that the electronic pen is gripped;
An attitude detection step of detecting an attitude of the electronic pen with respect to the touch panel;
A contact position detection step of detecting a contact position and a contact area of the electronic pen with respect to the touch panel;
When the contact position detection step detects contact with the touch panel, and the grip detection step detects that the electronic pen is gripped, the contact area detected by the contact position detection step, and According to the inclination of the electronic pen with respect to the touch panel detected by the posture detection step,
At least one of a handwriting display step of displaying a handwriting at the contact position detected by the contact position detection step and an information erasing step of painting the contact position detected by the contact position detection step with the background color of the touch panel An information display step to be
A method for controlling a touch panel system, comprising: For a computer that controls a touch panel system that displays handwriting of an electronic pen,
A grip detection step for detecting that the electronic pen is gripped;
An attitude detection step of detecting an attitude of the electronic pen with respect to the touch panel;
A contact position detection step of detecting a contact position and a contact area of the electronic pen with respect to the touch panel;
When the contact position detection step detects contact with the touch panel, and the grip detection step detects that the electronic pen is gripped, the contact area detected by the contact position detection step, and According to the inclination of the electronic pen with respect to the touch panel detected by the posture detection step,
At least one of a handwriting display step of displaying a handwriting at the contact position detected by the contact position detection step and an information erasing step of painting the contact position detected by the contact position detection step with the background color of the touch panel An information display step to be
A program for running

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