JP6201560B2 - Display device, display method, and display program - Google Patents

Description

  The present invention relates to a display device, a display method, and a display program.

  Application software that edits figures and images on a computer has a function (hereinafter referred to as "Undo function") that allows the user to resume work by returning the editing screen to the state before the work. It is often done. When such an undo function of the application software is executed, the editing screen can be returned to the original state before the editing work completed immediately before the editing work is executed at a certain point during the editing work. That is, each time the undo function is executed, the editing screen can be returned to the state in which the editing work immediately before the editing work completed immediately before that point is completed. Therefore, the user can resume the editing work after returning the editing screen to a specific state convenient for resuming the editing work by executing the undo function as many times as necessary.

  However, there are cases where the user himself / herself does not know how many times the undo function is executed to achieve a specific state that is convenient for the user to resume editing. For example, when an error is noticed after the editing process has progressed considerably. In such a case, it is necessary for the user to execute the undo function many times and go back to the editing work completed so far until the specific state is reached. In addition, the undo function may be executed excessively in the process of going back to the editing work, and the necessary editing work may be restored. As described above, in the conventional undo function, the editing screen is returned to the state in which the previous editing operation is completed each time the undo function is executed, so that the editing operation is not efficient.

  In consideration of such circumstances, the undo function has been improved in order to make it easier for the user to return the editing screen to the specific state (see, for example, Patent Document 1 below). In the data processing apparatus of Patent Document 1, in the document editing work, the work history is displayed using the tree structure or the time axis, so that the user can easily return the editing screen to the specific state.

  However, in the data processing apparatus disclosed in Patent Document 1, since the document edited by the user on the editing screen is not displayed in association with the work history, the user can only view the work history using the tree structure or the time axis. It is difficult to recall a particular state immediately. Therefore, the data processing apparatus of Patent Document 1 has a problem that it is difficult to quickly return the editing screen to the specific state.

International Publication No. 2006/051961 Pamphlet

  The present invention has been made in view of the above problems. Therefore, an object of the present invention is to provide a display device, a display method, and a display program that can quickly return an editing screen to a state convenient for a user to resume editing work.

  The above object of the present invention is achieved by the following.

(1) Display means for displaying an object on a screen, selection means for selecting the object, change means for changing a display form of an object selected by the selection means and receiving an erasure instruction, among the objects, and display forms have a, and restoring means for restoring the display form of an object which has received the restoration instruction is selected by the selection means of the modified the object, wherein the display means comprises electronic paper, the changing means A display device that changes the display form of the object by erasing the object displayed on the electronic paper and generating an afterimage of the object .

  (2) When the change unit is in the undo mode, the display unit changes the display form of the object selected by the selection unit and has received an erasure instruction. The display device according to (1), wherein the display device is erased from the display.

  (3) The display device according to (1) or (2), wherein the object is a handwritten object, a graphic object, or an image object.

( 4 ) The information processing apparatus further includes storage means for storing information on the object selected by the selection means and received the erasure instruction in a last-in first-out manner, and the restoration means selects any object by the selection means. The display device according to any one of (1) to ( 3 ) above, wherein when a restoration instruction is received in a state where there is no display, the display form of the object stored in the storage unit last is restored.

( 5 ) The change means changes any one of a shape, a size, a color, a pattern, a line type, and a line width of the object, according to any one of the above (1) to ( 4 ) The display device described.

( 6 ) The said change means changes the display form of the object which has already received the erasure instruction step by step whenever any of the objects displayed on the screen receives the erasure instruction. The display device according to any one of (1) to ( 5 ).

( 7 ) The above-mentioned changing means is characterized by changing stepwise with respect to any one of the interval between broken lines, the thickness of the line, the thickness of the line, and the color of the line of the object that has already received the erasure instruction. The display device according to 6 ).

(8) A display method executed in a display device including electronic paper, the step of displaying an object on a screen, the step of selecting the object by a selection unit, and the selection of the objects by the selection unit The step of changing the display form of the object that has received the erasure instruction, the step of selecting the object whose display form has been changed by the selection means, and the object selected by the selection means among the objects whose display form has been changed. Restoring the display form of the object that received the restoration instruction, and in the step of changing the display form of the object, the object displayed on the electronic paper is erased to generate an afterimage of the object A display method of changing a display form of the object by doing .

( 9 ) In the stage of changing the display form of the object, when the undo mode is selected, the display form of the object selected by the selection means and received the erasure instruction is changed and displayed, but is not in the undo mode. The display method according to ( 8 ), wherein the object is deleted from the screen.

( 10 ) The display method according to (8) or ( 9 ), wherein the object is a handwritten object, a graphic object, or an image object.

( 11 ) A display program configured to cause a display device to execute the display method according to any one of ( 8 ) to ( 10 ).

( 12 ) A computer-readable recording medium on which the display program according to ( 11 ) is recorded.

  According to the present invention, since the display form of the object that has received the erasure instruction is changed, not only the object that has received the erasure instruction last but also the object that has received the erasure instruction before that can be easily restored. Therefore, the editing screen can be quickly returned to a state convenient for the user to resume editing work.

It is a front view which shows an example of the display apparatus of one Embodiment of this invention. It is a block diagram which shows schematic structure of the display apparatus main body shown in FIG. FIG. 3 is a block diagram illustrating a schematic configuration of an image processing unit illustrated in FIG. 2. It is sectional drawing for demonstrating the principal part of the electronic paper with which the display part shown in FIG. 2 is provided. It is a block diagram which shows schematic structure of the control part shown in FIG. It is a flowchart for demonstrating the display method of one Embodiment of this invention. It is a figure for demonstrating the undo process of one Embodiment of this invention. It is a figure following FIG. 7A. It is a figure following FIG. 7B. It is a figure following FIG. 7C. It is a schematic diagram for demonstrating an example of operation | movement of the undo buffer in one Embodiment of this invention. It is a figure for demonstrating the example of a change of the display form in one Embodiment of this invention. It is a figure for demonstrating the example of a change of the display form in one Embodiment of this invention. It is a figure for demonstrating the example of a change of the display form in one Embodiment of this invention. It is a figure for demonstrating the undo process of the modification in one Embodiment of this invention. It is a figure following FIG. 10A. It is a figure following FIG. 10B. It is a figure following FIG. 10C.

  Hereinafter, embodiments of the eye gaze detection apparatus of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals are used for the same members. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.

(Embodiment)
FIG. 1 is a front view showing an example of a display device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a schematic configuration of the display device main body shown in FIG. 3 is a block diagram showing a schematic configuration of the image processing unit shown in FIG. 2, and FIG. 4 is a cross-sectional view for explaining a main part of the electronic paper included in the display unit shown in FIG. FIG. 3 is a block diagram showing a schematic configuration of a control unit shown in FIG. 2.

<Schematic configuration of display device>
As shown in FIG. 1, the display device A of the present embodiment includes a display device main body 100 and a touch pen 200. As shown in FIG. 2, the display device main body 100 includes an operation unit 10, an image processing unit 20, a power supply unit 30, a display unit 40, and a control unit 50, and these components are accommodated by a case member 60. Are electrically connected by wiring 70.

  The operation unit 10 receives an operation input from the user for the display device main body 100. In the present embodiment, the operation unit 10 includes a handwriting input button 1, an eraser button 2, an undo button 3, a page turning button 4, and a touch panel display 5. The user can set the operation mode for the display device A by operating the handwriting input button 1, the eraser button 2, the undo button 3, or the touch panel display 5. In the present embodiment, as the operation mode, when the handwriting input button 1 is pressed, the handwriting input mode is set, when the eraser button 2 is pressed, the eraser mode is set, and when the undo button 3 is pressed, the undo mode is set.

  In the handwriting input mode, the user can input figures, characters, and the like by handwriting by moving the pen tip of the touch pen 200 while being in contact with the touch panel display 5.

  In the eraser mode, the user can “erase” by selecting a figure, an image, a handwritten character and a figure (hereinafter referred to as “object”) displayed on the touch panel display 5 with the touch pen 200 or the like. . Hereinafter, in the present embodiment, an object that has been “erased” by a user operation is referred to as an “object that has received an erase instruction”. In the present embodiment, an object that has received an erasure instruction is not completely erased from the screen of the touch panel display 5 but is displayed with its display form changed. The display form of the object in this embodiment will be described later.

  In the undo mode, the user can cancel the input operation that has been performed. For example, when the undo button 3 is pressed after an object is inserted in the handwriting input mode, the insertion of the object is canceled. In addition, when the undo button 3 is pressed while an object for which an erase instruction is received in the eraser mode is selected with the touch pen 200 or the like, the display form of the object is “restored”. That is, the display mode of the object returns to the state before receiving the delete instruction. Hereinafter, in the present embodiment, pressing the undo button 3 in a state where the object that has received the erasure instruction is selected with the touch pen 200 or the like is referred to as “restore instruction”.

  Further, the user can switch the page displayed on the touch panel display 5 to the next page or the previous page by operating the page turning button 4.

  In the present embodiment, the operation mode of the display device A can also be selected from the menu MN displayed on the touch panel display 5. Specifically, the user brings the pen tip of the touch pen 200 into contact with any one of the handwriting input HW, the eraser ER, and the undo UD of the menu MN of the touch panel display 5 to operate the display device A from the menu MN. Select a mode. In the present embodiment, the operation unit 10 and the touch pen 200 function as selection means.

  The image processing unit 20 generates and processes image data to be displayed on the touch panel display 5. As illustrated in FIG. 3, in the present embodiment, the image processing unit 20 includes a generation unit 21, a change unit 22, and a restoration unit 23. The functions of the generation unit 21, the change unit 22, and the restoration unit 23 can be realized by an image processing processor (not shown) executing an image processing program, or can be realized by image processing hardware.

  The generation unit 21 generates image data to be displayed on the touch panel display 5. As described above, in the present embodiment, the user can input figures and characters on the touch panel display 5 by handwriting. The generation unit 21 generates an object based on a handwritten graphic or character input through the operation unit 10 and combines the object with a predetermined page to generate image data. The data of the predetermined page is downloaded from an external device through a communication unit (not shown) and stored in the control unit 50. The generated image data is transmitted to the display unit 40.

  The user can also input a pre-registered figure or image from the menu MN or the like. The generation unit 21 stores display data related to the shape of the object displayed on the touch panel display 5 in a storage unit (not shown). The generation unit 21 can also download the display data from an external device through the communication unit. The generation unit 21 allows the user to input information such as the display position, size, line width, and color of the object through the operation unit 10 and generates an object based on the information and the display data.

  The changing unit 22 functions as a changing unit and changes the display form of the object. The changing unit 22 has an undo buffer (not shown). The undo buffer has a predetermined number of storage areas, takes in information related to an object for which an erasure instruction has been received (hereinafter referred to as “erase object”) in the order in which the erasure instruction has been received, and stores it in a last-in first-out manner. Examples of the information related to the object include the display position, size, line width, and color of the object.

  In the present embodiment, the undo buffer preferably has about 10 storage areas, but the number of storage areas in the undo buffer is not particularly limited. For example, when the update unit 22 has an undo buffer having ten storage areas, when the eleventh object receives an erasure instruction, the first erasure object stored first is completely erased from the screen. That is, when an object is instructed to be erased beyond a predetermined number of storage areas provided in the undo buffer, the oldest erased object is completely erased.

  The change unit 22 changes the display form of the object selected with the touch pen 200 and received the erasure instruction from the objects displayed on the touch panel display 5. That is, a specific object to be deleted is selected after the eraser button 2 is pressed or in a state where the eraser button 2 is pressed, or the eraser button 2 is selected in a state where the specific object to be deleted is selected. When pressed, the display form of the object is changed. In the present embodiment, for example, a graphic drawn with a solid line is changed to a graphic drawn with a broken line. The display position of the object is the same position as before the change.

  In the present embodiment, the display form of the object means a form when the object is displayed on the touch panel display 5. The object display form includes, for example, the shape, size, color, pattern, line type, line width, and the like of the object. A specific example of the object display form will be described later.

  The restoration unit 23 functions as restoration means and restores the display form of the object. The restoration unit 23 restores the display form of an object that has been selected with the touch pen 200 and received a restoration instruction among the objects whose display form has been changed. That is, when the undo button 3 is pressed while a specific object to be restored is selected, the object display form is restored. In the present embodiment, for example, a figure whose display form has been changed from a solid line to a broken line by the eraser mode is restored to a figure drawn by a solid line by the undo mode. The display position of the object is the same position as before the change and before the restoration.

  The objects may be selected individually by touching with the touch pen 200, or a plurality of objects may be selected together. Alternatively, the object may be partially selected by tracing the object with the touch pen 200. The handwritten input object can use one stroke from the start position to the end position of the handwriting input as the unit of the object.

  The power supply unit 30 supplies power to each unit of the display device main body 100. The power supply unit 30 preferably includes a battery as a power supply from the viewpoint of easily carrying the display device main body 100. Moreover, as said battery, it is preferable that they are secondary batteries, such as an alkaline storage battery and a lithium ion battery.

  The display unit 40 functions as a display unit, and displays a page including the image data generated and processed by the image processing unit 20 on the touch panel display 5. In the present embodiment, the display unit 40 includes the touch panel display 5 and a display driver (not shown) for driving the touch panel display 5. The touch panel display 5 is provided with electronic paper.

  Hereinafter, with reference to FIG. 4, the structure of the principal part of the electronic paper with which the display part 40 is provided is demonstrated in detail. The electronic paper of the display unit 40 includes a support layer 41, a back electrode 42, an adhesive layer 43, a transparent electrode 44, a surface layer 45, and a microcapsule 46. The microcapsule 46 has a black pigment 46a and a white pigment 46b.

  The electronic paper employs an electrophoretic display technique using a microcapsule 46 in which a black pigment 46a having a negative charge and a white pigment 46b having a positive charge are encapsulated together with a transparent dispersion medium such as oil.

  The surface layer 45 is a front substrate made of a transparent material such as a PET (Polyethylene Terephthalate) film, and a transparent electrode 44 made of a transparent conductive film such as ITO (Indium Tin Oxide) is disposed on the back side thereof. . The support layer 41 is a back substrate made of an insulating material such as a polyimide film, and a back electrode (segment electrode) 42 made of a minute metal plate corresponding to each microcapsule 46 is arranged on the front side. Has been.

  The above-described microcapsules 46 are arranged between the individual back electrodes 42 and the transparent electrodes 44, and the individual microcapsules 46 are joined to the individual back electrodes 42 through the adhesive layer 43. In this way, a large number of microcapsules 46 arranged two-dimensionally in the space between the front substrate (surface layer 45) and the back substrate (support layer 41) via the two electrode plates 42 and 44 have the above-mentioned electrons. A paper display area is formed.

  The display principle of the microcapsules 46 arranged in this way is as follows. When a positive potential is applied to the back electrode 42 corresponding to one microcapsule 46, the negatively charged black pigment 46a moves to the back electrode 42 side, and the positively charged white pigment 46b moves to the transparent electrode 44 side. Since it moves, the microcapsule 46 displays white when viewed from the front side of the display area.

  Similarly, when a negative potential is applied to the back electrode 42 corresponding to one microcapsule 46, the positively charged white pigment 46b moves to the back electrode 42 side, and the negatively charged black pigment 46a becomes a transparent electrode. Therefore, the microcapsule 46 displays black when viewed from the front side of the display area.

  The control unit 50 controls the operation unit 10, the image processing unit 20, the power supply unit 30, and the display unit 40. As shown in FIG. 5, the control unit 50 includes an HDD (Hard Disk Drive) 51, a RAM (Random Access Memory) 52, a ROM (Read Only Memory) 53, and a CPU (Central Processing Unit) 54. These components are connected to each other by an internal bus 55.

  The HDD 51 stores various software such as an OS (Operating System) and a display program DP.

  The RAM 52 temporarily stores the various software, the data of the predetermined page, the calculation result when the CPU 54 executes the display program DP, and the like.

  The ROM 53 stores various parameters used when the CPU 54 executes the display program DP.

  The CPU 54 implements the display method of the present embodiment by executing the display program DP. Hereinafter, the display method of the present embodiment will be described in more detail with reference to FIGS. FIG. 6 is a flowchart for explaining the display method of the present embodiment, and FIGS. 7A to 7D are diagrams for explaining the undo process of the present embodiment. FIG. 8 is a schematic diagram for explaining the operation of the undo buffer according to the present embodiment, and FIGS. 9A to 9C are diagrams for explaining examples of changing the display form according to the present embodiment.

  Hereinafter, for example, the display method of this embodiment will be described by taking as an example a case where a user executes application software that edits a graphic or an image on the display device A and edits the graphic by handwriting.

  First, it is determined whether or not the handwriting input button has been pressed (step S101). When the handwriting input button is pressed (step S101: YES), editing is performed in the handwriting input mode (step S102). For example, FIG. 7A illustrates a case where the user draws line segments PQ, QR, RS, SP, and QS with the touch pen 200. On the screen of the touch panel display 5, line segments PQ, QR, RS, SP, and QS as objects are displayed.

  In FIG. 7A, for example, line segments PQ, QR, RS, SP, and QS are depicted as being in contact with each other at a single point Q, such as line segments PQ, QR, and QS. It is assumed that it is an object (line segment). That is, each line segment has a start position and an end position.

  7A to 7D illustrate the case where the object is a straight line for convenience of explanation, the object is not limited to a straight line, and may be a curve, a figure, a character, or the like.

  Then, it is determined whether or not to end editing (step S103). When editing is to be ended (step S103: YES), the process is ended. On the other hand, when the editing is not finished (step S103: NO), the process returns to step S101.

  On the other hand, if the handwriting input button has not been pressed (step S101: NO), it is determined whether or not the eraser button has been pressed (step S104). When the eraser button is pressed (step S104: YES), editing is performed in the eraser mode (step S105).

  As shown in FIG. 7B, for example, when the user sequentially selects line segments RS, QR, QS with the touch pen 200, the display form of the line segments RS, QR, QS is changed from a solid line to a broken line. As shown in FIG. 8, the undo buffers 1, 2, and 3 store information about the line segments RS, QR, and QS, respectively. Examples of the information on the line segment include a start position and an end position, a line type, a line width, and a color. On the other hand, regarding the undo buffers 4 and 5, nothing is stored yet. FIG. 8 is a diagram for conceptually explaining that the undo buffer stores information on the line segments RS, QR, and QS, and stores images of the shapes of the line segments RS, QR, and QS in the undo buffer. Does not mean to do.

  As described above, in the present embodiment, in the eraser mode, when an object is selected with the touch pen 200 and an erase instruction is received, the display form of the object on the screen of the touch panel display 5 is changed. That is, the object input in the handwriting input mode is not completely erased on the screen of the touch panel display 5, and the trace of the object remains at the same position as the input position.

  For convenience of explanation, FIG. 8 shows a case where the undo buffer has five storage areas. However, the size of the undo buffer storage area is limited to five. And can be set to an arbitrary size.

  Then, it is determined whether or not to end editing (step S103). When editing is to be ended (step S103: YES), the process is ended. On the other hand, when the editing is not finished (step S103: NO), the process returns to step S101.

  On the other hand, if the eraser button has not been pressed (step S104: NO), it is determined whether or not the undo button has been pressed (step S106). If the undo button has been pressed (step S106: YES), it is determined whether an erase object is selected (step S107). If the erase object has not been selected (step S107: NO), the object that received the erase instruction last is restored (step S108). In the case of the example shown in FIG. 8, the line segment QS that has received the erase instruction at the end stored in the undo buffer 3 is restored from a broken line to a solid line.

  On the other hand, when the erased object is selected (step S107: YES), the selected object is restored (step S109). For example, as shown in FIG. 7C and FIG. 7D, when the line segment QR that has received the erasure instruction is selected, the display form of the line segment QR is restored from the broken line to the solid line. As described above, in the present embodiment, the display form of an object that has been selected with the touch pen 200 and received a restoration instruction among the objects whose display form has been changed is restored. As a result, the display form of the selected erased object is restored to the original display form regardless of the order in which the erase instruction is received.

  Then, it is determined whether or not to end editing (step S103). When editing is to be ended (step S103: YES), the process is ended. On the other hand, when the editing is not finished (step S103: NO), the process proceeds to step S101.

  As described above, according to the flowchart shown in FIG. 6, the display device A displays an object on the screen of the touch panel display 5 and is selected by the touch pen 200 from the displayed objects and receives an erasure instruction. Change the display form of the object. Then, the display device A restores the display form of the object that has been selected with the touch pen 200 and received the restoration instruction among the objects whose display form has been changed.

<Change display format>
In the present embodiment, the display form of the erased object displayed on the screen of the touch panel display 5 can be changed step by step every time the object displayed on the screen receives an erase instruction. 9A to 9C are diagrams for explaining examples of changing the display form of the present embodiment.

  For example, each time the object receives an erasure instruction, the interval between the broken lines of the erasure object on the screen may be changed stepwise. As shown in FIG. 9A, when the line segments RS, QR, QS as objects are received in this order, the interval between the broken lines of the line segment RS is the largest, and the interval between the broken lines of the line segment QS is the smallest. Like that. As the distance between the broken lines of the erased object increases, the area of the line portion of the erased object decreases, so that the trace of the line segment remaining on the screen becomes thinner.

  Further, as shown in FIG. 9B, the width of the line may be changed. When the line segments RS, QR, QS as objects are received in this order, the line segment RS is made the thinnest and the line segment QS the thickest. As the width of the line of the erased object becomes smaller, the area of the line part of the erased object decreases, so that the trace of the line segment remaining on the screen becomes thinner.

  Further, as shown in FIG. 9C, the line density may be changed. When the line segments RS, QR, and QS as objects are received in this order, the line segment RS is the thinnest and the line segment QS is the darkest. As the darkness of the line of the erased object becomes lighter, the trace of the line segment remaining on the screen becomes thinner.

Thus, the traces of the line segments remaining on the screen become thinner as the erased object becomes older. As described above, when an object receives an erasure instruction exceeding a predetermined number of storage areas provided in the undo buffer, the oldest erasure object is completely erased.
Therefore, it is easy for the user to determine which erase object is new and which is erased among a plurality of erase objects. In addition, it is easy for the user to determine which erased object is completely erased next among the old erased objects.

  Moreover, as described above, the display unit 40 of the present embodiment includes electronic paper. In the electronic paper, when a voltage is applied to the back electrode 42 and the transparent electrode 44, the black pigment 46a of the plurality of microcapsules 46 corresponding to the dots of the object moves to the transparent electrode 44 side, and the white pigment 46b Move to the back electrode 42 side. As a result, the plurality of microcapsules 46 corresponding to the dots of the object display black when viewed from the front side of the display, thereby expressing the shape of the object.

  The object displayed on the electronic paper can be erased by overwriting the object dot with white. That is, by reversing the polarity of the applied voltage, the black pigment 46a of the plurality of microcapsules 46 corresponding to the dots of the object is moved to the back electrode 42 side, and the white pigment 46b is moved to the transparent electrode 44 side. The object can be deleted.

  However, since the movement of the black pigment 46a and the white pigment 46b is based on the electric attractive force, not all the black pigments 46a move to the back electrode 42 side, and the white pigment 46b moves to the transparent electrode 44 side. Not exclusively. Some black pigments 46a may remain on the transparent electrode 44 side.

  Therefore, by using such a part of the black pigment 46a remaining on the transparent electrode 44 side and intentionally leaving a trace of the object on the screen, the afterimage of the object can be used as an erased object. . That is, the display form of the object is changed by deleting the object displayed on the electronic paper and generating an afterimage of the object. Note that how much the black pigment 46a remains on the transparent electrode 44 side can be changed by adjusting the magnitude of the positive potential applied to the back electrode 42 and the magnitude of the negative potential applied to the transparent electrode 44 side.

<Modification>
In the example of FIGS. 7A to 7D described above, the case has been described in which the erase object is always displayed on the screen of the touch panel display 5 and the user confirms the erase object on the screen and executes the undo process. On the other hand, in the modification described below, the erase object is displayed on the screen only while the user presses the undo button 3, and the user confirms the erase object on the screen and executes the undo process. explain.

  10A to 10D are diagrams for explaining the undo process according to the modification of the present embodiment. In the present modification, the user draws line segments PQ, QR, RS, SP, and QS with the touch pen 200 in the handwriting mode as in the examples of FIGS. Is selected.

  As shown in FIG. 10A, in this modification, when the undo button 3 is not pressed, the erased object is not displayed on the screen.

  Next, as shown in FIG. 10B, when the undo button 3 is pressed, the erased object is displayed on the screen with a broken line. In the present modification, since the line segments RS, QR, and QS have received an erasure instruction, these erasure objects are displayed on the screen. As described above, in this modification, the undo mode is entered only while a predetermined operation by the user such as the undo button 3 being pressed, and a recoverable candidate among the erased objects is displayed on the screen.

  Next, as shown in FIG. 10C, the erase object is selected with the touch pen 200 while the undo button 3 is being pressed. In this modification, the case where the erase object of line segment QR is selected is illustrated.

  Next, as shown in FIG. 10D, when the undo button 3 is released, the restored line segment QR is displayed as a solid line on the screen. On the other hand, the erase objects of the line segments RS and QS are erased.

  As described above, according to the present modification, the erased object candidates that can be restored only when the undo button 3 is pressed are displayed on the screen, so the erased object is always displayed on the screen. Compared to the case, the user feels less annoying.

  The display device A, the display method, and the display program of the present embodiment described as described above have the following effects.

  Since the display device A of the present embodiment changes the display form of the object that has received the erasure instruction, not only the object that has received the erasure instruction last but also the object that has previously received the erasure instruction can be easily restored. it can. Therefore, the editing screen can be quickly returned to a state convenient for the user to resume editing work.

  As described above, in the embodiment, the display device, the display method, and the display program of the present invention have been described. However, it goes without saying that the present invention can be appropriately added, modified, and omitted by those skilled in the art within the scope of the technical idea.

  For example, in the above-described embodiment, the case where the display unit includes monochrome electronic paper has been described as an example. However, the present invention can also be applied to color electronic paper.

  In the above-described embodiment, the case where the display unit includes electronic paper has been described as an example. However, the present invention can also be applied to a case where the display unit includes a liquid crystal display device or a plasma display device.

A display device,
DP display program,
ER eraser,
HW handwriting input,
MN menu,
UD Undo,
1 Handwriting input button,
2 Eraser button,
3 Undo button
4 Page turning button,
10 operation unit,
20 image processing unit,
21 generator,
22 Change Department,
23 Restoration part,
30 power supply,
40 display section,
50 control unit,
51 HDD,
52 RAM,
53 ROM,
54 CPU,
55 Internal bus,
60 case member,
70 Wiring,
100 display device body,
200 Touch pen.

Claims (12)

Display means for displaying objects on the screen;
Selecting means for selecting the object;
Changing means for changing the display form of the object selected by the selecting means and receiving the erasure instruction among the objects,
Restoring means for restoring the display form of the object selected by the selection means among the objects whose display form has been changed and received a restoration instruction ;
The display means includes electronic paper,
The changing means is
A display device that changes a display form of the object by erasing the object displayed on the electronic paper and generating an afterimage of the object . The changing means is
When the undo mode is selected, the display mode of the object selected by the selection unit and received the erasure instruction is changed and displayed.
The display device according to claim 1, wherein the object is deleted from the screen when not in the undo mode.   The display device according to claim 1, wherein the object is a handwritten object, a graphic object, or an image object. Storage means for storing information on the object selected by the selection means and received the erasure instruction in a last-in first-out manner;
The restoration means includes
If the selection unit receives a restore instruction is not selected any of the objects, any one of the claims 1-3, characterized in that to restore the display mode of the last stored in the storage means the object The display device according to item. The changing means is
Shape of the object, size, color, pattern, line type, and a display device according to any one of claims 1 to 4, characterized in that to change any of the line width. The changing means is
Each time any of the objects displayed on the screen is subjected to erasure instruction already claim 1-5, characterized in that the stepwise change a display form of an object which has received the deletion instruction 1 The display device according to item. The changing means is
The display device according to claim 6 , wherein any one of an interval of a broken line, a line thickness, a line darkness, and a line color of the object that has already received an erasure instruction is changed in a stepwise manner. A display method executed in a display device including electronic paper,
Displaying objects on the screen;
Selecting the object with a selection means;
Changing the display form of the object selected by the selection means among the objects and receiving an erasure instruction;
Selecting the object whose display form has been changed by the selection means;
Restoring the display form of the object that has been selected by the selection means among the objects whose display form has been changed and received a restoration instruction ,
In the step of changing the display form of the object,
A display method of changing a display form of the object by deleting the object displayed on the electronic paper and generating an afterimage of the object . In the step of changing the display form of the object,
When the undo mode is selected, the display mode of the object selected by the selection unit and received the erasure instruction is changed and displayed.
The display method according to claim 8 , wherein the object is deleted from the screen when not in the undo mode. The display method according to claim 8 , wherein the object is a handwritten object, a graphic object, or an image object. The display program comprised so that a display apparatus may perform the display method of any one of Claims 8-10 . The computer-readable recording medium which recorded the display program of Claim 11 .