JP6698907B2 - Display device, display method, display program, and electronic blackboard - Google Patents

Description

  The present invention relates to a display device for displaying an image on a screen, a display method, a display program, and an electronic blackboard including the display device, and in particular, a display device for displaying the contents drawn by a plurality of pens on the screen, The present invention relates to a display method, a display program, and an electronic blackboard including the display device.

  As a replacement for the conventional whiteboard paired with a magic pen, a touch panel function was added to a large liquid crystal display device (hereinafter also referred to as "display"), and a touch pen for drawing (hereinafter simply referred to as " Sometimes referred to as a "pen.") is becoming popular as an electronic blackboard. In such an electronic blackboard, it is possible to use a display having a touch panel function and a pen, and to display, as an image on the display, the content according to the locus drawn by the pen on the display. By changing the thickness, color, and type of the lines assigned to the pens, it is possible to treat one pen as if it were a large number of pens and create an image with rich expression.

JP, 2011-145763, A JP, 2013-175142, A

  Here, the electronic blackboard is often used in school classrooms, conference rooms at work, etc. In such a usage environment, there is a usage pattern in which a plurality of people draw on the electronic blackboard using their own pens. is assumed. However, in the prior art, even if various colors, thicknesses and types can be assigned to a pen, the pen is only one pen. When it is decided to reuse one pen, each user, when the pen is assigned to him, sets attributes such as color, thickness and type to the assigned pen depending on the occasion. Draw on the touch panel with the pen after setting. Even if a plurality of pens are prepared, different pens do not necessarily have different attributes such as different colors, thicknesses, and types. The same attribute may be assigned to different pens.In such a case, not only the user but also the device can identify which drawing content displayed on the screen is drawn by which pen. Can not do it. Therefore, even if different pens are assigned to each user, as long as the same attributes are assigned to different pens, not only the user but also the device can determine which drawing content is displayed on the screen. I can't tell if it was drawn. Therefore, it is not possible to switch the display and non-display of the drawing contents for each pen. If a different pen is assigned to each user, it is not possible to switch the display and non-display of the drawing content for each user.

  Further, the conventional electronic blackboard has the following problems.

  The first problem will be described with reference to FIG. FIG. 1A shows a state in which the pen 1 draws "aiueo", the pen 2 draws "kakikukeko", and the pen 3 draws "sashisuseso". Here, as shown in FIG. 1B, when the eraser function is used to wipe the screen with an electronic eraser (for example, a pen having an eraser attribute), the screen shown in FIG. As shown in the figure, all the drawing contents in the portion approaching the locus wiped by the electronic eraser are erased. However, for example, there is a case where it is required to leave the “scratch mark” drawn by the pen 2, and such a case cannot be dealt with.

  The second problem will be described with reference to FIG. FIG. 2A shows a state in which the pen 1 draws "aiueo", the pen 2 draws "kakikukeko", and the pen 3 draws "sashisuseso". Here, as shown in FIGS. 2(b) and 2(c), when the designated area of the screen is erased by using the area designation erasing function, the area is in the area as shown in FIG. 2(d). All drawing contents are deleted. However, for example, there is a case where it is required to leave the “scratch mark” drawn by the pen 2, and such a case cannot be dealt with.

  The third problem will be described with reference to FIG. FIG. 3A shows a state in which the pen 1 draws "aiueo", the pen 2 draws "kakikukeko", and the pen 3 draws "sashisuseso". Here, as shown in FIG. 3B, when the entire screen is erased by using the function for erasing all of the drawing contents, as shown in FIG. 3C, all the drawing contents on the entire screen are erased. To be done. However, for example, there is a case where it is required to leave the “scratch mark” drawn by the pen 2, and such a case cannot be dealt with.

  In Patent Document 1, in an electronic pen system using a plurality of electronic pens and a touch panel, the electronic pen includes an attribute selection unit that allows an attribute to be selected by a user, and the attribute information selected by the attribute selection unit and its own An invention is described in which pen information to which identification information is added is transmitted to a control device, and the control device causes a display device to display an image corresponding to the attribute information acquired from the pen information received from the electronic pen. However, in the invention of Patent Document 1, although various attributes can be switched and assigned to one pen in this way, it is not possible to use different pens for each attribute, and it is not possible to use a plurality of identifiable pens. ..

  Further, in Patent Document 2, in order to enable writing using a plurality of pens on a tablet at the same time, waves of different wavelengths are emitted from different pens, and these waves propagate through the tablet. Later, an invention is described in which the coordinates of the pen are determined for each pen after being detected after passing through a filter having a band pass for each wave provided at the end of the tablet. However, the invention of Patent Document 2 relates to an input interface for enabling drawing with a plurality of pens even if a plurality of pens are used at the same time.

  Therefore, the present invention displays the contents drawn by a plurality of pens on the screen, and can switch the display and non-display of the drawn contents for each pen, the display method, the display program, and the display program. It is an object to provide an electronic blackboard including a display device.

According to the invention,
A display device for displaying the contents drawn by a plurality of pens on the screen based on the drawing data corresponding to the contents,
If drawing is performed using any one of the plurality of pens, a drawing data generation unit that generates drawing data corresponding to the pen and the drawing,
Storage means for storing the drawing data,
If the drawing data corresponding to the pen is stored in the storage unit while the display mode is being set for any one of the plurality of pens, the pen is supported based on the drawing data. Is allowed to be displayed on the screen, and the drawing data corresponding to the pen is stored in the storage unit while the non-display mode is set for any one of the plurality of pens. The display permission/prohibition control means for prohibiting the display of the drawing content corresponding to the pen on the screen, and at least a part of the drawing data stored in the storage means. A warning is issued when attempting to start drawing with the display unit that displays the drawing content permitted to be displayed on the screen by the display permission/prohibition control unit and the pen set in the non-display mode. Notification means for notifying,
There is provided a display device comprising:

Further, according to the present invention,
A display device for displaying the contents drawn by a plurality of pens on the screen based on the drawing data corresponding to the contents,
If drawing is performed using any one of the plurality of pens, a drawing data generation unit that generates drawing data corresponding to the pen and the drawing,
Storage means for storing the drawing data,
If the drawing data corresponding to the pen is stored in the storage device while the display mode is being set for any of the plurality of pens, the pen is supported based on the drawing data. Is allowed to be displayed on the screen, and the drawing data corresponding to the pen is stored in the storage unit while the non-display mode is set for any one of the plurality of pens. Display permission/prohibition control means for prohibiting the drawing content corresponding to the pen from being displayed on the screen,
Display means for displaying, on the screen, the drawing content permitted to be displayed on the screen by the display permission/prohibition control means, based on at least a part of the drawing data stored in the storage means. And
If there is drawing content corresponding to any one of the plurality of pens in the portion on the screen to be erased by the erasing means, whether the drawing content is displayed in the subsequent display setting is determined. A display device is provided which is characterized by whether a display mode or a non-display mode is being set for the pen when erasing. Further, according to the present invention, there is provided an electronic blackboard including the above display device.

Further according to the invention,
A display method for displaying the contents drawn by a plurality of pens on the screen based on the drawing data corresponding to the contents,
If drawing is performed using any one of the plurality of pens, a drawing data generating step of generating drawing data corresponding to the pen and the drawing,
A storage step of storing the drawing data in a storage means;
If the drawing data corresponding to the pen is stored in the storage unit while the display mode is being set for any one of the plurality of pens, the pen is supported based on the drawing data. Is allowed to be displayed on the screen, and the drawing data corresponding to the pen is stored in the storage unit while the non-display mode is set for any one of the plurality of pens. Display permission/prohibition step of prohibiting the drawing content corresponding to the pen from being displayed on the screen,
A display step of displaying, on the screen, the drawing content which is permitted to be displayed on the screen by the display permitting/prohibiting step based on at least a part of the drawing data stored in the storage means; ,
A notification step of notifying a warning when starting drawing with the pen set to the non-display mode,
There is provided a display method comprising:

Further according to the invention,
A display method for displaying the contents drawn by a plurality of pens on the screen based on the drawing data corresponding to the contents,
If drawing is performed using any one of the plurality of pens, a drawing data generating step of generating drawing data corresponding to the pen and the drawing,
A storage step of storing the drawing data in a storage means;
If the drawing data corresponding to the pen is stored in the storage unit while the display mode is being set for any one of the plurality of pens, the pen is supported based on the drawing data. Is allowed to be displayed on the screen, and the drawing data corresponding to the pen is stored in the storage unit while the non-display mode is set for any one of the plurality of pens. Display permission/prohibition step of prohibiting the drawing content corresponding to the pen from being displayed on the screen,
A display step of displaying, on the screen, the drawing content which is permitted to be displayed on the screen by the display permitting/prohibiting step based on at least a part of the drawing data stored in the storage means; ,
Have
If there is a drawing content corresponding to any one of the plurality of pens in the portion on the screen to be erased by the erasing means, whether or not the drawing content is displayed in the subsequent display setting is determined. A display method is provided, which is characterized by whether a display mode or a non-display mode is being set for the pen when erasing.

  Furthermore, according to the present invention, there is provided a display program for causing a computer to function as the display device.

  According to the present invention, the contents drawn by a plurality of pens can be displayed on the screen, and the display and non-display of the drawn contents can be switched for each pen.

It is a 1st figure for demonstrating a prior art example. It is a 2nd figure for demonstrating a prior art example. It is a 3rd figure for demonstrating a prior art example. It is a conceptual diagram which shows the whole structure of the electronic blackboard by embodiment of this invention. It is a block diagram which shows the detailed structure of the IWB function part shown in FIG. 3 illustrates an example of drawing data corresponding to one trajectory of a touch pen according to an embodiment of the present invention. It is a figure which shows an example of the locus|trajectory by a touch pen. FIG. 6 is a diagram showing a state of screen transition of the electronic blackboard in the operation example of the first embodiment of the present invention. FIG. 6 is a flow chart for explaining an operation for making a drawing content by the pen 2 in a non-display state in the operation example of the first exemplary embodiment of the present invention. FIG. 6 is a flow chart for explaining an operation for bringing a drawing content by the pen 2 into a display state in an operation example of the first exemplary embodiment of the present invention. It is a figure which shows the mode of a screen transition of the electronic blackboard in the operation example of Embodiment 2 of this invention. It is a flow diagram for explaining an operation example of the second embodiment of the present invention. It is a figure which shows the mode of a screen transition of the electronic blackboard in the operation example of Embodiment 3 of this invention. FIG. 11 is a flowchart for explaining an operation example of the third embodiment of the present invention. It is a figure which shows the mode of a screen transition of the electronic blackboard in the operation example of Embodiment 4 of this invention. FIG. 3 is a block diagram showing a detailed configuration example of a portion related to the present invention of the electronic blackboard according to the embodiment of the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 4 is a conceptual diagram showing the overall configuration of the electronic blackboard according to the embodiment of the present invention.

  Referring to FIG. 4, an electronic blackboard according to an exemplary embodiment of the present invention may include a screen 101, a touch panel processing unit 103, a plurality of touch pens 105, a touch pen signal receiver 107, and an interactive white board functional unit (Interactive White Board functional unit; , "IWB functional unit"). The display device of the present invention includes, for example, an IWB function unit 109.

  The screen 101 is, for example, a large liquid crystal panel, which generally displays an image in accordance with an input video signal, and particularly displays the drawing content by the touch pen 105. The touch panel processing unit 103 detects contact, depression, or proximity of the touch pen 105 with a sensor included in the touch panel processing unit 103, processes the detection signal with a built-in microcomputer, or the like, and transmits a touch panel signal including position information of the touch pen 105 by wire or wirelessly. To output. Each touch pen 105 is used by the user to draw, and touches, pushes, or approaches the touch panel according to the user's operation. In addition, each touch pen 105 outputs the individual identification information of the touch pen itself and the operation information (information indicating the operation content for the operation button equipped on the touch pen itself) by wire or wirelessly. The touch pen signal receiver 107 inputs the individual identification information and operation information of the touch pen from each touch pen 105, and outputs it to the IWB function unit 109 by wire or wirelessly. The IWB function unit 109 inputs a touch panel signal from the touch panel processing unit 103, and also inputs individual identification information and operation information of the touch pen from the touch pen signal receiver 107. Further, the IWB function unit 109 generates drawing data representing the drawing content by the touch pen based on the individual identification information and operation information of the touch pen and the touch panel signal, and outputs an image signal including the drawing data to the screen 101. The screen 101 displays the screen based on this image signal, whereby the drawing content by each touch pen 105 is displayed on the screen 101.

  Although the number of the touch pens 105 is two in FIG. 4, it may be one or any number of three or more. Further, normally, the drawing content is drawn on the screen 101 at a position where the touch pen 105 makes contact or the like. As a result, when an image other than the drawing content by the touch pen is superimposed and displayed, it is possible to use the electronic blackboard as if you were directly writing to the image or deleting the written content with the touch pen. Becomes

  FIG. 5 is a block diagram showing a detailed configuration of the IWB function unit 109 shown in FIG.

  Referring to FIG. 5, the IWB function unit 109 includes a control unit 109-1, a communication unit 109-3, a storage unit 109-5, and a RAM (Random Access Memory) 109-7. These are connected to each other by a bus 109-9. The RAM 109-7 also includes a touch pen ID number management unit 121, a display state management unit 123 for each touch pen ID number, and a screen display data storage unit 125.

  The control unit 109-1 is configured of, for example, a CPU (Central Processing Unit), and reads various programs stored in the storage unit 109-5 and executes the programs to perform various controls. 5 and particularly, the arithmetic processing for causing each hardware component shown in FIG. 5 to function as the IWB function unit 109 as a whole.

  The communication unit 109-3 communicates with the touch pen signal receiver 107 for inputting individual information and operation information of the pen being used, communication for inputting a touch panel signal from the touch panel processing unit 103, and an image on the screen 101. Performs communication to output a signal.

  The storage unit 109-5 is, for example, a non-volatile storage medium such as an HDD (Hard Disk Drive) or a CD-ROM (Compact Disc-Read Only Memory), which is controlled by the control unit 109-1. A program and the like for performing the arithmetic processing of are stored.

  The RAM 109-7 is a recording medium for temporarily storing data, stores the program read from the storage unit 109-5, and also stores various data generated by executing the program. To do. The control unit 109-1 described above performs arithmetic processing for control by reading and executing the program loaded in the RAM 109-7 after being read from the storage unit 109-5.

  The touch pen ID number management unit 121, for each touch pen, individual identification information of the touch pen (for example, a MAC address (Media Access Control Address) of the touch pen) and an ID number which is a management number on a program executed by the control unit 109. (Hereinafter, sometimes referred to as “touch pen ID”). This table included in the touch pen ID number management unit 121 is rewritable, and for example, the user can change a touch pen ID associated with certain individual identification information to another touch pen ID, or It is possible to change certain individual identification information associated with the touch pen ID to other individual identification information.

  The display state management unit 123 for each touch pen ID number includes a table (see Table 2) for managing the display state of the touch pen for each touch pen. This table holds a touch pen ID and a display state corresponding to the touch pen ID in association with each other. The display state includes "displaying" and "non-displaying".

  The display state management unit 123 for each touch pen ID number includes a table (see Table 3) for managing the color of the touch pen for each touch pen. This table holds the touch pen ID and the identification information of the corresponding color in association with each other.

  In addition, the display state management unit 123 for each touch pen ID number includes a table (see Table 4) for managing the thickness of the touch pen for each touch pen. This table holds the touch pen ID and the identification information of the thickness corresponding thereto in association with each other.

  In the function button area on the screen, for example, a black pen icon, a red pen icon, and a blue pen icon are displayed. Then, for example, when the red pen icon is pressed with the touch pen, the icon is selected. Furthermore, when the red pen icon is pressed with the touch pen, the thickness of the graphic representing the thickness of the pen included in the icon changes. Each time the touch pen is pressed, the IWB function unit 109 can grasp the information indicating which color of the pen icon is pressed and the information indicating the current thickness of the pen. On the other hand, the IWB function unit 109 touches the pen icon. Since the touch pen is also grasped by a predetermined method, the color and thickness grasped when the pen icon is pressed by the touch pen can be assigned to the touch pen. Then, when the allocation is held and drawing is performed using the touch pen, the ID, color, and thickness of the touch pen are included in drawing data (described later) representing the content of the drawing.

  The screen display data storage unit 125 holds drawing data for displaying the content drawn by the touch pen on the screen. This drawing data is associated with the touch pen ID corresponding to the touch pen used for drawing. FIG. 6 shows an example of drawing data corresponding to one trajectory of the touch pen. Here, one locus is a locus between SD1 and SU1, a locus between SD2 and SU2, or a locus between SD3 and SU3 as shown in FIG. In the example of FIG. 7, there are three loci. The drawing data shown in FIG. 6 has drawing data numbers in the first column, touch pen IDs in the second column, touch pen color in the third column, touch pen thickness in the fourth column, and touch pen thickness in the fifth column. , The number of drawing data is assigned. Here, one locus is represented by one or a plurality of data sets, and the number of drawing data in the fifth column corresponds to the number of data sets forming one locus. The sixth and subsequent columns are assigned to one or more data sets. There are a plurality of types of data sets, for example, there are a data set of a linear type and a data set of a curved (cubic Bezier curve) type. Examples of these are shown in Table 5.

  As shown in Table 5, the data set whose type is a straight line is identified by a data type ID whose value is 0x10, the number of data is 4, and includes four coordinates. The data set of the cubic Bezier curve type is identified by the data type ID having a value of 0x11, the number of data is 8, and includes eight coordinates.

  Therefore, the portion shown in the second and subsequent rows of the drawing data corresponding to one locus of the touch pen shown in FIG. 6 has a length depending on the number of data sets and the type of each data set. As will be described later, the drawing unit generates drawing pixel data based on the numerical drawing data represented by such numerical values.

  When the touch panel signal is input via the communication unit 109-3, the control unit 109-1 also inputs the pen individual information via the communication unit 109-3, and the touch pen ID corresponding to the individual identification information of the pen. Can be searched from the touch pen ID number management unit 121. Then, as shown in FIG. 6, the retrieved touch pen ID can be included in the numerical drawing data generated based on the touch panel signal.

  Next, for each of the four operation examples, the screen transition of the electronic blackboard will be described, and then the internal operation will be described.

[Operation Example of First Embodiment]
FIG. 8 is a diagram showing how the screen of the electronic blackboard changes in the operation example of the first embodiment.

  FIG. 8A shows a state in which the pen 1 draws “aiueo”, the pen 2 draws “kakikukeko”, and the pen 3 draws “sashisuseso”. Here, as shown in FIG. 8B, the operation button group includes a “pen 1 non-display” button, a “pen 2 non-display” button, and a “pen 3 non-display” button. The “pen 1 non-display” button is a button for switching the display state of the drawing content by the pen 1 to “non-displaying”. Similarly, the “pen 2 non-display” button is a button for switching the display state of the drawing content by the pen 2 to “non-displaying”. Further, the “non-display of pen 3” button is a button for switching the display state of the drawing content by the pen 3 to “in non-display”. Here, as shown in FIG. 8B, when the “pen 2 non-display” button is pressed with the touch pen, the label of this button toggles to “pen 2 display”. Then, as shown in FIG. 8C, the drawing content of the pen 1 "Aiueo" and the drawing content of the pen 3 "Sashisuseso" are still displayed, but the drawing content of the pen 2 " Only "Kukeko" is hidden.

  The label is toggled to "display pen 2" When the button is pressed again with the touch pen, the label toggles back to "hide pen 2". Then, as shown in FIG. 8D, the drawing content of the pen 2 which has been hidden is displayed again.

  Thus, every time this button is pressed, the label of this button toggles between "Hide Pen 2" and "Display Pen 2", and the function of this button is Toggles between the function for setting the display state to "non-displaying" and the function for setting the display state of the drawing content by the pen 2 to "displaying". Further, the display state of the drawing content by the pen 2 is switched between "displaying" and "non-displaying".

  The same applies to the pen 1 and the pen 3.

  It should be noted that for a certain touch pen, in order to switch between display and non-display, it is necessary to press the button corresponding to the pen, but the touch pen used for the pressing is the target of switching. The touch pen may be a touch pen that is present, or any other touch pen. Therefore, when the touch pen is different for each user, not only can the user switch between display and non-display of the drawing content by a certain user, but also the display and non-display of other users. Since it can be switched, convenience is improved.

  It is also possible to adopt a configuration in which switching by another user is prohibited. For this purpose, when a button is pressed, the touch pen ID is detected in advance by using the individual information of the touch pen that pressed the button and the touch pen ID number management unit 121.

  FIG. 9 is a flowchart for explaining an operation for setting the display state of the drawing content by a certain pen (pen 2 as an example) to “non-displaying” in the operation example of the first embodiment. With respect to all the drawing data (shown in FIG. 6) corresponding to all the drawing contents, it is checked whether the drawing data is associated with the pen 2. Performs processing to change the display state of the corresponding drawing content to "non-displaying".

  More specifically, first, the first drawing data is searched (step S201). The drawing data here is for each trajectory. Next, it is determined whether or not the search of the drawing data for each trajectory has been completed (step S203). If it has ended (YES in step S203), the operation ends.

  If not completed (NO in step S203), it is determined whether or not the drawing data corresponds to the drawing content by the pen 2 by looking at the touch pen ID column shown in FIG. 6 (step S205). If it corresponds (YES in step S205), the non-display process corresponding to the drawing data is performed (step S207), and then the process proceeds to the search for the drawing data corresponding to the next trajectory (step S209). If they do not correspond (NO in step S205), the process directly proceeds to search for drawing data corresponding to the next locus (step S209). From step S209, the process returns to step S203.

  FIG. 10 is a flowchart for explaining the operation for setting the display state of the drawing content by a certain pen (pen 2 as an example) to “displaying” in the operation example of the first embodiment. With respect to all the drawing data (shown in FIG. 6) corresponding to all the drawing contents, it is checked whether the drawing data is associated with the pen 2. Performs processing to change the display state of the corresponding drawing content to "displaying".

  As is clear from a comparison between FIG. 9 and FIG. 10, the only change in FIG. 10 with respect to FIG. 9 is that the step S207 of the non-display process is changed to the step S227 of the display process. In step S227, non-display processing corresponding to the drawing data is performed.

  The other steps are the same as those in FIG. 9, so redundant description will be omitted.

  As will be described later with reference to FIG. 16, the drawing pixel data representing the drawing content of each pen is stored in the screen display data storage unit 125 as drawing pixel data storage unit 315 corresponding to only that pen, as described later with reference to FIG. The drawing pixel data may be stored for each pen, and whether the drawing pixel data is included in the combined drawing pixel data may be switched depending on whether or not the drawing content by the pen is displayed.

[Operation Example of Second Embodiment]
FIG. 11 is a diagram showing a transition of screens on the electronic blackboard in the operation example of the second embodiment.

  In FIG. 11A, “Aiueo” is drawn by the pen 1, “Kakikukeko” is drawn by the pen 2, “Sashisuseso” is drawn by the pen 3, and then “Aiueo” is drawn by the pen 1. Then, the display state of "Sashisuseso" which is the drawing content by the pen 3 is still "displaying", but the display state of "Kakikukeko" which is the drawing content by the pen 2 is switched to "not displaying". It is showing the situation. Here, as shown in FIG. 11B, when the eraser function is used to wipe the screen with an electronic eraser (for example, a pen having an eraser attribute), the screen shown in FIG. As shown in the drawing, the drawing contents by the pen 1 that is "displaying" and the drawing that is being displayed by the pen 3 that is "displaying" among the drawing contents that are near the path where the electronic eraser wipes The content “Suseso” is erased, but the “hidden” drawing content by the pen 2 “not displayed” is not erased. It should be noted that FIG. 11C shows the screen after the display state of the pen 2 is returned to "displaying" after the eraser function has been used. The drawing content of the pen 2 “in the non-display” cannot be erased even by using the eraser function, and since it is returned to the “displaying” thereafter, it is displayed in the screen of FIG. 11C. There is.

  FIG. 12 is a flow chart for explaining the operation of the operation example of the second exemplary embodiment.

  First, drawing data that is a candidate for erasure is detected (step S241). In the case of erasing the entire screen, all drawing data are candidates for erasing. When the area is designated, the drawing data included in the area is a candidate for erasure. When the eraser function is used, for example, the track of the eraser is detected every predetermined period, and the drawing data approaching the track becomes a candidate for deletion.

  Next, the processes between steps S243S and S243E are repeated for all the drawing data detected in step S241.

  In each iteration, first, the touch pen ID corresponding to the drawing data that is a candidate for the erase target selected in the current iteration is acquired (step S245).

  Next, it is determined whether “displaying” is set for the touch pen ID acquired in step S245 (step S247). If "displaying" is set (YES in step S247), a process of erasing the drawing data that is a candidate for the erasure target selected in the current repetition from the image display data storage unit 125 is performed (step ). S249). If “non-displaying” is set (NO in step S247), the drawing data that is a candidate for erasure selected in the current iteration is kept in the image display data storage unit 125. To do.

[Operation Example of Third Embodiment]
FIG. 13 is a diagram showing how the screen of the electronic blackboard changes in the operation example of the third embodiment.

  In FIG. 13( a ), “aiueo” is drawn by pen 1, after “aiueo” is drawn by pen 1, “kakikukeko” is drawn by pen 2, and “sashisuseso” is drawn by pen 3. Then, the display state of "Sashisuseso" which is the drawing content by the pen 3 is still "displaying", but the display state of "Kakikukeko" which is the drawing content by the pen 2 is switched to "not displaying". It is showing the situation. Here, as shown in FIG. 13B, the touch pen 2 is used to start drawing. Then, since "non-displaying" is currently set for the drawing contents by the touch pen 2, as shown in FIG. 13C, a message box for notifying that drawing by the touch pen 2 cannot be displayed is displayed. , Drawing with the touch pen 2 is prohibited.

  FIG. 14 is a flow chart for explaining the operation of the operation example of the third exemplary embodiment.

  Referring to FIG. 14, first, the pen wait is detected until it is detected (step S261), and if it is detected, the touch pen and the touch pen signal receiver 107 communicate with each other (step S263).

  Next, the individual identification information of the touch pen is acquired from the communication result in step S263 (step S265).

  Next, it is confirmed whether or not the touch pen ID number corresponding to the individual identification information acquired in step S265 exists in the table in the touch pen ID number management unit 121 (step S267). If it does not exist (NO in step S267), the touch-down pen that has been pen-down displays an error message for notifying that it cannot be used because it is not registered (S269).

  If it exists (YES in step S267), the touch pen ID number searched from the table in the touch pen ID number management unit 121 in step S267 is determined as that of the touch pen that has been pen-down (step S271).

  Next, it is confirmed whether or not the display state corresponding to the touch pen ID determined in step S271 is "displaying" (step S273). If it is "displaying" (YES in step S273), the process proceeds to the drawing process by the pen-down touch pen (step S275). In the case of “non-displaying” (NO in step S273), an error message for notifying that the drawing contents by the touch-down pen that is pen-down cannot be used because it is currently in “non-displaying” is displayed. It is displayed (S277).

  In the drawing process (step S275), drawing data as shown in FIG. 6 is generated based on the confirmed touch pen ID and the trajectory of the touch pen, the drawing data is saved in the screen display data saving unit 125, and the saved drawing data is saved. An image signal including the reflected contents is generated and transmitted to the screen.

[Operation Example of Fourth Embodiment]
FIG. 15 is a diagram showing how the screen of the electronic blackboard changes in the operation example of the fourth embodiment. The operation example of the fourth embodiment is a case where the electronic blackboard is used in an arithmetic lesson.

  FIG. 15A shows a state in which the problem of obtaining the volume of a three-dimensional figure is displayed on the screen. This screen is displayed by, for example, an application program executed by a personal computer connected to the electronic blackboard.

  FIG. 15B shows a state in which the student A writes an answer using the touch pen 1.

  In FIG. 15(c), the teacher confirms the answer content written by the student A, and then presses the "non-display of pen 1" button to once draw the content of the touch pen 1, that is, the student A writes it. It shows a state in which the display state of the answer contents is set to "not displaying".

  FIG. 15D shows a state in which the student B uses the touch pen 2 to write an answer by another solution.

  After this, if the teacher presses the "Hide Pen 2" button and then the "Display Pen 1" button, the display state of the answer contents written by Student B using touch pen 2 is "Hide". It becomes possible to return the content of the answer written by the student A using the touch pen 1 to "displaying" by setting "medium".

  When the display state of the answer content written by the student A is set to “non-displaying” or the display state of the response content written by the student B is set to “non-displaying”, the method described with reference to FIG. A similar method is performed.

  Further, when returning the answer content written by the student A to “in display”, the same method as the method described with reference to FIG. 10 is executed.

[Detailed configuration example]
FIG. 16 is a block diagram showing a detailed configuration example of a portion related to the present invention of the electronic blackboard according to the embodiment of the present invention. The configuration example corresponds to the case where the erasing unit is image data for each locus. The display device of the present invention includes, for example, the block shown in FIG.

  Referring to FIG. 16, this configuration example includes an erased area detection unit 301, a drawing pixel data combining unit 317, and a combined drawing pixel data storage unit 319 as the building blocks corresponding to the entire touch pens 1 to 3.

  In addition, in this configuration example, the pen 1 erased numerical value drawing data detection unit 303-1 for each locus, the pen 1 numeric value drawing data erasure prevention unit 305-1, and the pen 1 numeric value drawing for each locus are the configuration blocks corresponding to the touch pen 1. It includes a data erasing unit 307-1, a pen 1 numerical drawing data generation unit 309-1, a pen 1 numerical drawing data storage unit 311-1, a pen 1 drawing unit 313-1, and a pen 1 drawing pixel data storage unit 315-1.

  Further, in this configuration example, the pen 2 erased numerical value drawing data detection unit 303-2 for each trajectory, the pen 2 numeric value drawing data erasure prevention unit 305-2, and the pen 2 numerical value rendering for each trajectory are provided as the constituent blocks corresponding to the touch pen 2. A data erasing unit 307-2, a pen 2 numerical drawing data generation unit 309-2, a pen 2 numerical drawing data storage unit 311-2, a pen 2 drawing unit 313-2, and a pen 2 drawing pixel data storage unit 315-2 are included.

  Furthermore, in this configuration example, the pen 3 erased numerical value drawing data detection unit 303-3 for each trajectory, the pen 3 numeric value drawing data erasure prevention unit 305-3, and the pen 3 numeric value drawing data for each trajectory are the constituent blocks corresponding to the touch pen 3. An erasing unit 307-3, a pen 3 numerical drawing data generation unit 309-3, a pen 3 numerical drawing data storage unit 311-3, a pen 3 drawing unit 313-3, and a pen 3 drawing pixel data storage unit 315-3 are included.

  Each of the storage units described above is provided in, for example, the screen display data storage unit 125. Further, each unit other than each of the above storage units is realized by, for example, the control unit 109-1 reading and executing a program stored in the storage unit 109-5. Further, at least a part of each unit other than each of the above storage units is constructed in the RAM 109-7 by, for example, the control unit 109-1 reading and executing a program stored in the storage unit 109-5. It may be done.

  Next, the description regarding each block will be described particularly with reference to the touch pen 1, but the description regarding the touch pen 1 can be applied to the touch pen 2 and the touch pen 3.

  The pen 1 numerical drawing data generation unit 309-1 generates pen 1 numerical drawing data based on the pen 1 trajectory data and the like.

  The pen 1 numerical value drawing data storage unit 311-1 stores pen numerical value drawing data. The erased area detection unit 301 detects an erased area. When erasing using the eraser function, for example, the erased area is detected based on the trajectory of the eraser for each predetermined period. When erasing by designating an area, for example, the erasing area is detected based on the upper left coordinates and the lower right coordinates of the area. In the case of erasing all data, the entire area is the erased area.

  The pen 1 erased numerical drawing data detection unit 303-1 for each trajectory is based on the erased region detected by the erased region detection unit 301 and the pen 1 numerically drawn data stored in the pen 1 numerically drawn data storage unit 311-1. Then, the pen 1 numerical drawing data corresponding to the trajectory included in the erasing area is detected as the numerical drawing data to be erased. Here, the numerical drawing data is as shown in FIG.

  The pen 1 numeric drawing data erasure prevention unit 305-1 inputs the display state of pen 1 display/non-display from Table 2, and when the display state is “displaying”, the pen 1 numeric drawing data drawing for each trajectory is performed. The drawing data number (see FIG. 6), which is the identification information for specifying the numerical drawing data to be erased, output from the data detection unit 303-1 is output to the pen 1 numerical drawing data erasing unit 307-1 for each trajectory as it is. However, if the display state is "non-display", no drawing data number is output to the pen 1 numerical drawing data erasing unit 307-1 for each trajectory.

  The pen 1 numerical drawing data erasing unit 307-1 for each trajectory stores the numerical drawing data specified by the drawing data number input from the pen 1 numerical drawing data erasure prevention unit 305-1, in the pen 1 numerical drawing data storage unit 311-1. Erase from.

  By doing so, it is possible to prevent the drawing data by the touch pen whose display state is "non-display" from being erased.

  The pen 1 drawing unit 313-1 generates pen 1 drawing pixel data based on the pen 1 numerical drawing data stored in the pen 1 numerical drawing data storage unit 311-1.

  The pen 1 drawing pixel data storage unit 315-1 stores the pen pixel drawing data.

  When the pen 1 display/non-display data input from Table 2 indicates “displaying”, the drawing pixel data synthesizing unit 317 stores the pen 1 stored in the pen 1 drawing pixel data storage unit 315-1. The drawing pixel data is output to the composite drawing pixel data storage unit 319. On the contrary, when the pen 1 display/non-display data input from Table 2 indicates “non-displaying”, the pen 1 drawing pixel data stored in the pen 1 drawing pixel data storage unit 315-1 It is not output to the composite drawing pixel data storage unit 319.

  It should be noted that all the stored contents of the combined drawing pixel data storage unit 319 are erased for each frame, and the drawing pixel data combining unit 317 is operated for each frame. That is, if the display/non-display state of the pen n is “displaying”, the content of the pen n drawing pixel data storage unit 315-n is copied to the composite drawing pixel data storage unit 319, and it is “not displaying”. For example, it does not copy. However, without erasing the storage content of the composite drawing pixel data storage unit 319 for each frame, only the pixel data for switching from “displaying” to “non-displaying” is positively output from the composite drawing pixel data storage unit 319. You may erase it.

  In this way, when "displaying" is set as the display state for the touch pen whose pen pixel drawing data is stored in the pen 1 drawing pixel data storage unit 315-1, the drawing content by the touch pen is displayed. However, conversely, when "non-display" is set as the display state, the drawing content by the touch pen is not displayed.

  Therefore, it is possible to display only the drawing content by the touch pen whose display state is “displaying”.

  As described above, the description related to the touch pen 1 can be applied to the touch pen 2 and the touch pen 3, and thus the similar description related to the touch pen 2 and the touch pen 3 will be omitted.

  In this configuration example, the erase unit is the numerical drawing data for each trajectory. That is, the erase unit is the entire drawing data shown in FIG. 6, but in addition to this, the erase unit may be a data set unit included in the drawing data shown in FIG. 6 or a pixel unit.

  Further, the invention described in Patent Document 2 may be used to add a function that allows a plurality of touch pens to draw at the same time, and may be combined with the above embodiment.

  The display device and the electronic blackboard described above can be realized by hardware, software, or a combination thereof. Further, the above display method can also be realized by hardware, software, or a combination thereof. Here, “realized by software” means realized by the computer reading and executing the program.

  The program can be stored using various types of non-transitory computer readable media and can be supplied to the computer. Non-transitory computer readable media include various types of tangible storage media. Examples of the non-transitory computer readable medium include a magnetic recording medium (for example, flexible disk, magnetic tape, hard disk drive), magneto-optical recording medium (for example, magneto-optical disk), CD-ROM (Read Only Memory), CD- R, CD-R/W, and semiconductor memory (for example, mask ROM (Read Only Memory), PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)) are included.

  In addition, the program may be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

  INDUSTRIAL APPLICABILITY The present invention can be used to draw on a screen equipped with a touch panel using a plurality of touch pens.

101 screen 103 touch panel processing unit 105 touch pen 107 touch pen signal receiver
109 IWB functional unit 109-1 Control unit 109-3 Communication unit 109-5 Storage unit 109-7 RAM
121 touch pen ID number management unit 123 display state management unit for each touch pen ID number 125 screen display data storage unit

Claims (15)

A display device for displaying the contents drawn by a plurality of pens on the screen based on the drawing data corresponding to the contents,
If drawing is performed using any one of the plurality of pens, a drawing data generation unit that generates drawing data corresponding to the pen and the drawing,
Storage means for storing the drawing data,
If the drawing data corresponding to the pen is stored in the storage unit while the display mode is set for any one of the plurality of pens, the pen is supported based on the drawing data. The drawing content corresponding to the pen is stored in the storage unit while the non-display mode is set for any one of the plurality of pens. Display permission/prohibition control means for prohibiting the drawing content corresponding to the pen from being displayed on the screen,
Display means for displaying, on the screen, the drawing content permitted to be displayed on the screen by the display permission/prohibition control means , based on at least a part of the drawing data stored in the storage means. And a notification means for notifying a warning when starting drawing with the pen set to the non-display mode,
A display device comprising: The display device according to claim 1, wherein
Drawing data maintaining means for maintaining the drawing data corresponding to the pen stored in the storage means unchanged while the non-display mode is set for any one of the plurality of pens A display device further comprising: The display device according to claim 2, wherein
The drawing data maintenance means is
An erase prevention unit is provided to prevent the drawing data corresponding to the pen from being erased from the storage unit while the non-display mode is set for any one of the plurality of pens. Characteristic display device. The display device according to claim 3,
The erasure prevention means sets the non-display mode corresponding to the pen to the portion on the screen to be erased by the erasing means while the non-display mode is set for any one of the plurality of pens. A display device which prevents drawing data corresponding to the drawing content from being erased from the storage means even if the drawing content exists. The display device according to claim 2, wherein
The drawing data maintenance means is
A display device, comprising: a drawing prohibition unit for prohibiting drawing using any one of the plurality of pens while the non-display mode is being set. The display device according to any one of claims 2 to 4, wherein:
After the non-display mode is set for any one of the plurality of pens, when "display" is set for the pen, immediately before the non-display mode is set, A display device further comprising a re-display unit for re-displaying the drawing content by the pen. The display device according to any one of claims 2 to 5,
A display device further comprising display/non-display setting means for setting display/non-display for each of at least some of the plurality of pens. The display device according to claim 7, wherein
The display/non-display setting means,
A means for displaying on the screen an icon for each pen that can be set to show/hide,
When detecting an operation on the icon, a means for switching display/non-display corresponding to the icon,
A display device comprising: The display device according to claim 7 or 8, wherein
The display/non-display setting unit can be used for setting any pen selected from among the pen to be set and at least one other pen. A display device, which is configured as described above. The display device according to any one of claims 1 to 9,
It is possible to assign any one of a plurality of mutually different colors and one or both of a plurality of mutually different thicknesses to the same pen. A display device, further comprising: an allocation unit for. The display device according to any one of claims 1 to 10, wherein
A display device, wherein at least some of the plurality of pens individually correspond to individual users. The display device according to any one of claims 1 to 11,
A display device further comprising a simultaneous drawing means for simultaneously drawing with at least two pens of the plurality of pens.   An electronic blackboard comprising the display device according to claim 1. A display method for displaying the content drawn by a plurality of pens on the screen based on the drawing data corresponding to the content, wherein drawing is performed using any one of the plurality of pens. Then, a drawing data generation step for generating drawing data corresponding to the pen and the drawing,
A storage step of storing the drawing data in a storage means;
If the drawing data corresponding to the pen is stored in the storage unit while the display mode is being set for any one of the plurality of pens, the pen is supported based on the drawing data. Is allowed to be displayed on the screen, and the drawing data corresponding to the pen is stored in the storage unit while the non-display mode is set for any one of the plurality of pens. Display permission/prohibition step of prohibiting the drawing content corresponding to the pen from being displayed on the screen,
A display step of displaying, on the screen, the drawing content which is permitted to be displayed on the screen by the display permitting/prohibiting step based on at least a part of the drawing data stored in the storage means; ,
A notification step of notifying a warning when starting drawing with the pen set to the non-display mode,
A display method comprising: A display program for causing a computer to function as the display device according to claim 1.

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