JP2011207034A - Image display device and image display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device capable of achieving miniaturization thereof, and an image display method.SOLUTION: The image display device 10 includes a display body 12 displaying an image; a plurality of electrodes 13 laid over a display surface of the display body 12 and extended in an X direction and mutually separated in a Y direction crossing the X direction; a plurality of electrodes 14 laid over the display surface of the display body 12 and extended in the Y direction and mutually separated in the X direction; a transparent base material 15 arranged on the display surface of the display body 12 to which writing by handwriting is performed; a moving body 16 arranged on the display surface of the display body 12 with the transparent base material 15 held between them, and moved on the display surface of the display body 12 along the Y direction; a reading part 17 disposed on the moving body 16, extended in the X direction, and reading the image displayed by the display body 12 and writing to the transparent base material 15 by movement of the moving body 16; and a voltage supply part 18 provided on the moving body 16 and supplying the voltage to the plurality of the electrodes 13 in order in accordance with movement of the moving body 16.

Description

  The present invention relates to an image display device that displays an image and an image display method.

  There is a whiteboard with a scanner that reads the content written on the whiteboard with a scanner that moves above the whiteboard and converts the read content into image information.

  On the other hand, there is an image display device in which a display device that displays an image based on image information is built in a whiteboard, and a transparent sheet that can be written by handwriting is arranged above the display device. In this image display device, the image displayed on the display device and the writing on the transparent sheet can be viewed in an overlapping manner.

  For such an image display apparatus, it is conceivable to provide a scanner as described above. In this case, the image displayed by the display device and the writing on the sheet are read by the scanner.

  In addition, as an image display device, for example, a whiteboard made of a large reflective display medium, a technology that provides a transparent plate on the front surface of the reflective display medium, and enables additional drawing by hand on the transparent plate (For example, refer to Patent Document 1).

Moreover, there is an electronic blackboard provided with a transparent sheet that can slide along a plate surface (see, for example, Patent Document 2).
In addition, there is a whiteboard that includes electronic paper and a front plate stacked on the surface of the electronic paper, the front plate transmits visible light, and ink can be attached to the front surface (for example, Patent Documents) 3).

Further, there is a technique having display means for displaying a locus drawn on a sheet-like object by a user on the sheet-like object with respect to the sheet-like object superimposed on the display screen of the display device (
(See Patent Document 4).

JP 2007-96792 A Japanese Patent Laid-Open No. 9-163053 JP 2004-255858 A JP 2009-252048 A

  However, a whiteboard with a built-in display device is provided with a driving device for displaying an image and its peripheral circuit, and thus the whiteboard may be increased in size.

Such a problem may occur not only in the whiteboard but also in other image display apparatuses incorporating a display device.
In view of such a point, an object of the present invention is to provide an image display device and an image display method capable of downsizing the image display device.

In order to achieve the above object, the following image display apparatus is provided.
The image display device includes a display body for displaying an image, and a plurality of first layers stacked on a display surface of the display body and extending in a first direction and spaced apart from each other in a second direction intersecting the first direction. A plurality of second electrodes stacked in the display surface of the display body and extending in the second direction and spaced apart from each other in the first direction. An electrode group on which an image based on the voltage supplied to the display body is displayed, a transparent substrate on the display surface of the display body on which writing by handwriting is performed, and a transparent base on the display surface of the display body A moving body that is arranged with a material interposed therebetween and moves on the display surface of the display body in the second direction, and an image provided on the moving body, extending in the first direction, and displayed on the display body by the movement of the moving body And a reading unit that reads the writing on the transparent base material, and a moving body, and a plurality of first units are provided as the moving body moves. Having a voltage supply unit for supplying a voltage to turn on each of the electrodes.

  According to the disclosed image display device and the image display method, the number of components mounted on the image display device can be reduced because the drive device and its peripheral circuits can be reduced. Cost reduction can be realized.

It is a figure which shows an example of the image display apparatus which concerns on 1st Embodiment. It is a figure which shows an example of the external appearance of the image display apparatus which concerns on 2nd Embodiment. It is a figure which shows an example of the hardware of the image display apparatus which concerns on 2nd Embodiment. It is a top view which shows an example of the image display apparatus which concerns on 2nd Embodiment. It is an enlarged plan view which shows an example of the image display apparatus which concerns on 2nd Embodiment. It is sectional drawing of FIG. It is sectional drawing of FIG. It is a circuit diagram which shows an example of the image display apparatus which concerns on 2nd Embodiment. 12 is a timing chart illustrating an example of a writing operation of the image display apparatus according to the second embodiment. It is a figure which shows an example of the characteristic of the display body which concerns on 2nd Embodiment. It is a flowchart which shows an example of the process sequence of the image display apparatus which concerns on 2nd Embodiment. It is a flowchart which shows an example of the process sequence of the image display apparatus which concerns on 2nd Embodiment. It is a flowchart which shows an example of the process sequence of the image display apparatus which concerns on 2nd Embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a diagram illustrating an example of an image display device according to the first embodiment.

  The image display apparatus 10 includes a board 11, a display body 12, a plurality of electrodes 13 provided in the horizontal direction with respect to the display body 12, and a plurality of electrodes 14 provided in the vertical direction with respect to the display body 12. A group, a transparent substrate 15, and a moving body 16.

The display body 12 is provided on the board 11 and displays an image based on the image information.
Each of the plurality of electrodes 13 is stacked on the display body 12 and extends in the X direction, and is spaced apart from each other in the Y direction intersecting the X direction. Each of the plurality of electrodes 14 is stacked on the display body 12 and extends in the Y direction, and is spaced apart from each other in the X direction. An image based on the voltages supplied to the plurality of electrodes 13 and the plurality of electrodes 14 is displayed on the display body 12.

The transparent substrate 15 is disposed above the display body 12. The transparent base material 15 is written by handwriting.
The moving body 16 is disposed with a transparent base material 15 disposed above (display surface side) above the display body 12, and moves above the display body 12 in the Y direction. Further, the moving body 16 includes a reading unit 17 and a voltage supply unit 18.

  The reading unit 17 extends in the X direction, and simultaneously reads an image displayed on the display body 12 by the movement of the moving body 16 and writing on the transparent base material 15. The voltage supply unit 18 sequentially supplies a voltage to each of the plurality of electrodes 13 as the moving body 16 moves.

  That is, in the image display device 10, the moving body 16 moves, and a voltage is supplied to each of the plurality of electrodes 13 by the voltage supply unit 18, whereby a new image can be displayed on the display body 12. It becomes. That is, in the image display apparatus 10, the moving body 16 provided with the reading unit 17 has the function of a driving device that drives the plurality of electrodes 13.

  As a result, in the image display device 10, it is not necessary to provide a drive device for driving the plurality of electrodes 13 on the board 11, so that the area of the board 11 can be reduced and the image display device 10 can be downsized. It becomes possible.

Next, a more specific embodiment of the image display device 10 will be described as a second embodiment.
[Second Embodiment]
First, the appearance of the image display device according to the second embodiment will be described.

FIG. 2 is a diagram illustrating an example of the appearance of the image display device according to the second embodiment.
The image display device 100 includes a board 110, a display device 120, a clear sheet 130, a scanner module 140, and rails 150 and 160. Here, the scanner module 140 corresponds to the moving body 16 of the image display device 10 according to the first embodiment, and the clear sheet 130 is a transparent base material of the image display device 10 according to the first embodiment. Corresponds to 15.

  The board 110 is provided with a display device 120 and rails 150 and 160 provided on both sides of the display device 120. An image based on the image information is displayed on the display device 120.

  A clear sheet 130 is arranged above the display device 120 (on the display surface side). As the clear sheet 130, for example, a resin sheet is used. The clear sheet 130 is transparent, transmits an image displayed on the display device 120, and can be written with an aqueous marker or the like. The writing on the clear sheet 130 can be erased by, for example, an eraser.

  Further, a sheet on which writing has been performed can be attached to the clear sheet 130. Attachment of the written paper is performed by, for example, pasting the paper on the clear sheet 130 or sandwiching the paper between the clear sheet 130 and the display device 120.

  A scanner module 140 is disposed above the display device 120 (on the display surface side) with a clear sheet 130 interposed therebetween. The scanner module 140 moves above the display device 120 (display surface side) along the rails 150 and 160. The scanner module 140 moves in a vertical direction from a top point located at the top end of the display device 120 to a bottom end located at the bottom end of the display device 120.

Next, the hardware of the image display apparatus 100 will be described.
FIG. 3 is a diagram illustrating an example of hardware of the image display device according to the second embodiment.
The image display apparatus 100 includes a processor 170, a device control 180, a storage medium reader / writer 190, a driving device 200, a display device 120, a scanner device 210, a voltage supply device 220, a page indicator 230, and a button 231. , 232, 233. The entire image display apparatus 100 is controlled by the processor 170.

  The processor 170, device control 180, storage medium reader / writer 190, drive device 200, display device 120, page indicator 230, and buttons 231, 232, and 233 are provided on the board 110. The scanner device 210 and the voltage supply device 220 are provided in the scanner module 140. In this embodiment, the voltage supply devices 220 are provided at both ends of the scanner module 140, but may be provided only on one of the left and right sides.

  As the display device 120, for example, a display device that reflects light and displays an image is used. As such a reflective display device, for example, electronic paper is used. In a reflective display device such as electronic paper, the display brightness depends on the environmental brightness. Therefore, when the environmental brightness is high, the display brightness is also increased. For this reason, unlike the self-luminous display device, the reflective display device does not need to reduce the environmental brightness for easy viewing. For example, when a reflective display device is used in a conference room or the like, it is not necessary to darken the room, which is useful.

  Further, the display device 120 includes a plurality of segment electrodes 240 and a plurality of common electrodes 250. The display device 120 displays an image based on voltages supplied to the plurality of segment electrodes 240 and the plurality of common electrodes 250.

  When the scanner module 140 moves above the display device 120, the scanner device 210 writes the image displayed on the display device 120, the clear sheet 130, and the paper attached to the clear sheet 130. Simultaneously read and convert to image information.

  The driving device 200 supplies a voltage to the plurality of segment electrodes 240. The voltage supply device 220 supplies a voltage to the plurality of common electrodes 250. The voltage supply device 220 detects a common electrode to be supplied with voltage from among the plurality of common electrodes 250.

  The storage medium reader / writer 190 is connected to the processor 170 and the scanner device 210 by wiring. The storage medium reader / writer 190 reads out image information stored in the storage medium in accordance with an instruction from the processor 170 and transmits the image information to the processor 170. In addition, the storage medium reader / writer 190 writes the image information read by the scanner device 210 to the storage medium in accordance with an instruction from the processor 170.

  The device control 180 is connected to the processor 170, the driving device 200, the scanner module 140, the scanner device 210, and the voltage supply device 220 by wiring. The device control 180 controls the driving device 200, the scanner device 210, and the voltage supply device 220 in accordance with instructions from the processor 170. Further, the device control 180 controls the movement of the scanner module 140 in accordance with a command from the processor 170, and further detects the position of the scanner module 140.

The page indicator 230 is connected to the processor 170 by wiring, and displays the page number of the image being displayed on the display device 120 in accordance with an instruction from the processor 170.
The buttons 231 to 233 are connected to the processor 170 by wiring, and transmit a signal to the processor 170 when pressed by the user. The button 231 is a “next page” button that transmits a signal for displaying an image of the next page on the display device 120. The button 232 is a “copy” button that transmits a signal for copying an image displayed on the display device 120. The button 233 is a “next page / copy” button for copying an image displayed on the display device 120 and transmitting a signal for displaying the image of the next page on the display device 120.

Next, details of the display device 120 and the scanner module 140 will be described.
FIG. 4 is a plan view showing an example of an image display apparatus according to the second embodiment. In FIG. 4, the clear sheet 130 is not shown.

The display device 120 includes a display body 260, a plurality of segment electrodes 240, and a plurality of common electrodes 250.
The display body 260 is provided on the surface 111 of the board 110. As the display body 260, for example, a display body that reflects light and displays an image is used. For example, a liquid crystal is used for the display body 260.

  Each of the plurality of common electrodes 250 is stacked on the display body 260 and extends in the X direction, and is separated from each other in the Y direction intersecting the X direction. That is, the plurality of common electrodes 250 are arranged across the display body 260 in the X direction. Both ends of the plurality of common electrodes 250 are positioned outside the display body 260.

  Here, the X direction corresponds to the right direction, and the Y direction corresponds to the downward direction. Of the plurality of common electrodes 250, the uppermost electrode is referred to as the uppermost electrode, and the lowermost electrode is referred to as the lowermost electrode.

  Each of the plurality of segment electrodes 240 is stacked on the display body 260 and extends in the Y direction, and is separated from each other in the X direction. That is, the plurality of segment electrodes 240 are disposed across the display body 260 in the Y direction.

The drive device 200 is arranged in the upward direction with respect to the display body 260. The rails 150 and 160 extend in the vertical direction and are arranged on both sides of the display body 260, respectively.
The scanner module 140 extends along the rails 150 and 160 above the display body 260 in the Y direction (downward from the top of the display body 260) and in the direction opposite to the Y direction (from the bottom up of the display body 260). Direction). The scanner module 140 moves in the vertical direction from the uppermost point located at the upper end of the display body 260 to the lowermost point located at the lower end of the display body 260. The scanner device 210 is fixed to the scanner module 140. The scanner device 210 extends in the X direction and is disposed across the display body 260.

  The voltage supply device 220 includes a shaft 270, voltage supply rollers 280 and 290, and voltage detection rollers 300 and 310. The surfaces of the voltage supply rollers 280 and 290 and the voltage detection rollers 300 and 310 are formed of electrodes. The voltage supply rollers 280 and 290 and the voltage detection rollers 300 and 310 are attached to the shaft 270. The shaft 270 is fixed to the scanner module 140.

  The voltage supply rollers 280 and 290 sequentially supply voltages to each of the plurality of common electrodes 250 as the scanner module 140 moves. The voltage supply rollers 280 and 290 supply voltages to both ends of the plurality of common electrodes 250 positioned outside the display body 260, respectively. Thereby, it becomes possible to supply a voltage equally to each of the plurality of common electrodes 250 within the electrodes. That is, it is possible to reduce the influence of the voltage drop due to the length of the electrode. The voltage supply to the common electrode 250 may be performed for each common electrode or a plurality of common electrodes may be performed simultaneously.

  The voltage detection rollers 300 and 310 sequentially detect the voltages of the plurality of common electrodes 250 as the scanner module 140 moves. The voltage detection rollers 300 and 310 detect voltages from both ends of the plurality of common electrodes 250 positioned outside the display body 260. The voltage detection by the voltage detection rollers 300 and 310 may be performed for each common electrode, or a plurality of them may be performed simultaneously.

Next, the moving mechanism of the scanner module 140 will be described in detail.
FIG. 5 is an enlarged plan view showing an example of an image display apparatus according to the second embodiment.
FIG. 5 is an enlarged plan view showing the end of the scanner module 140 on the side where the voltage supply roller 280 is provided, but the end on the side where the voltage supply roller 290 is provided also has the same structure. I have.

  The scanner module 140 has a moving plate 320. When the moving plate 320 moves, the scanner module 140 moves. The moving plate 320 is inserted into the groove 151 provided in the rail 150 and moves along the groove 151. The shaft 270 is rotatably attached to the moving plate 320.

  Further, a shaft 330 is rotatably attached to the moving plate 320 on the side opposite to the side to which the shaft 270 is attached. A gear 340 is attached to the shaft 330. As the moving plate 320 moves, the gear 340 meshes with a tooth base 350 that is provided on the rail 150 and extends in the Y direction, and rotates. Since the gear 340 meshes with the tooth base 350, the scanner module 140 can be prevented from shifting in the X direction and the opposite direction.

6 is a cross-sectional view of FIG. 6 corresponds to a cross-sectional view taken along a dotted line AA in FIG.
A portion of the moving plate 320 that is inserted into the groove 151 of the rail 150 is fixed to a belt 360 that moves in the rail 150. Further, at a place inserted into the groove 151 of the moving plate 320, there are a rubber wheel 370 that keeps a distance from the inner wall of the rail 150 constant in the direction of the surface 111 of the board 110, and an inner wall of the rail 150 in the thickness direction of the board 110. A rubber wheel 380 that keeps a constant distance is attached.

  A glass substrate 390 is formed on the surface 111 of the board 110, and a plurality of common electrodes 250 are formed on the glass substrate 390. Further, a display body 260 is formed on a glass substrate 390 on which a plurality of common electrodes 250 are formed, and a plurality of segment electrodes 240 are formed on the display body 260. Furthermore, the resin substrate 400 is formed on the display body 260 on which the plurality of segment electrodes 240 are formed.

  The ends of the plurality of common electrodes 250 are located outside the display body 260 and the resin substrate 400 and are exposed from the display body 260 and the resin substrate 400. The voltage supply roller 280 and the voltage detection roller 300 are in contact with the ends of the plurality of common electrodes 250 exposed from the display body 260 and the resin substrate 400.

FIG. 7 is a cross-sectional view of FIG. FIG. 7A corresponds to a cross-sectional view taken along a dotted line BB in FIG.
The voltage supply roller 280 rotates with the movement of the moving plate 320 and sequentially contacts each of the plurality of common electrodes 250. As a result, a voltage is sequentially supplied to each of the plurality of common electrodes 250.

  Although not shown, the voltage detection roller 300 is similarly rotated with the movement of the moving plate 320 and sequentially contacts each of the plurality of common electrodes 250. Thereby, the voltages of the plurality of common electrodes 250 are detected in order.

Here, the scanner device 210 is located in front of the voltage supply roller 280 and the voltage detection roller 300 in the Y direction.
The voltage supply roller 280 and the voltage detection roller 300 are in contact with the common electrode at the same timing with respect to the plurality of common electrodes 250.

FIG. 7B corresponds to a cross-sectional view taken along a dotted line CC in FIG.
The belt 360 moves in the Y direction and in the direction opposite to the Y direction. The movement of the belt 360 is controlled by the device control 180. For example, the belt 360 is attached to a rotating body including a power source (not shown) and moves by the rotation of the rotating body. As a result, the moving plate 320 moves and the gear 340 meshes with the tooth base 350 and rotates.

Next, the writing operation of the image display apparatus 100 will be described.
FIG. 8 is a circuit diagram showing an example of an image display apparatus according to the second embodiment.
The image display apparatus 100 includes a drive control circuit 181, voltage generators 182 and 184, a counter 183, and a drive driver 201. Here, the drive control circuit 181, the voltage generators 182 and 184, and the counter 183 are provided in the device control 180. The drive driver 201 is provided in the drive device 200.

  The drive control circuit 181 is connected to the processor 170, and synchronizes pixel information (DATA [1: 0]) for one line with the shift clock signal (SCLK) based on image information stored in the storage medium. , Transfer to the drive driver 201. Further, the drive control circuit 181 transmits a latch signal (LATCH) and a frame signal (FR) to the drive driver 201.

  Further, the drive control circuit 181 transmits a power supply enable signal and a voltage selection signal to the voltage generator 182. Further, the drive control circuit 181 transmits a power supply enable signal and a frame signal to the voltage generator 184.

  The voltage generator 182 supplies the voltage selected by the voltage selection signal to the drive driver 201 in accordance with the power supply enable signal. The voltage generator 184 supplies a voltage based on the frame signal to the plurality of common electrodes 250 via the voltage supply rollers 280 and 290 in response to the power supply enable signal.

The counter 183 counts the detection of the plurality of common electrodes 150 by the voltage detection rollers 300 and 310 and transmits the count value to the drive control circuit 181.
When receiving the latch signal, the drive driver 201 supplies voltages (SEG_out1, SEG_out2, SEG_out3,... SEG_outn) based on the pixel information to the plurality of segment electrodes 240, respectively. Further, when receiving the frame signal, the drive driver 201 inverts the voltage supplied to the plurality of segment electrodes 240.

  Note that a composite voltage of a voltage supplied to the plurality of segment electrodes 240 and a voltage supplied to the plurality of common electrodes 250 is applied to the display body 260. For example, when the voltage supplied to the plurality of segment electrodes 250 is “+40 V” and the voltage supplied to the plurality of common electrodes is “+0 V”, “+40 V” is applied to the display body 260.

FIG. 9 is a timing chart illustrating an example of a writing operation of the image display apparatus according to the second embodiment.
First, when the voltage detection rollers 300 and 310 move to detect one of the plurality of common electrodes 250, the counter 183 counts up or down, and transmits the count value to the drive control circuit 181. Then, the drive control circuit 181 transfers pixel information (DATA [1: 0]) corresponding to the received count value to the drive driver 201 in synchronization with the shift clock (SCLK).

  Next, when the drive control circuit 181 completes the transfer of pixel information for one line, it transmits a latch signal (LATCH) to the driver 210. Further, the drive control circuit 181 transmits a frame signal (FR) to the drive driver 210 and the voltage generator 184.

  Next, the drive driver 201 supplies voltages (SEG_out1 to n) based on the pixel information to the plurality of segment electrodes 240, respectively. Thereby, an image for one line is written on the display body 260.

  As the scanner module 140 moves, the voltage detection rollers 300 and 310 sequentially detect the common electrodes. Therefore, the write operation is performed for each detection. That is, when the scanner module 140 moves in the range from the highest point to the lowest point, and the voltage detection rollers 300 and 310 detect all of the plurality of common electrodes 250, the writing of the image on the display body 260 is completed.

  Here, the voltage (SEG_out1 to n) is supplied in a time division manner. Here, a display method of four gradations is used, and a voltage based on pixel information is transmitted in a time division manner into four divisions. In addition, what is necessary is just to increase a time division area, when increasing a gradation.

  Further, in each time division section, driving is performed so that the voltage supplied to the plurality of segment electrodes 240 and the voltage supplied to the plurality of common voltages 250 are inverted in synchronization with the 50% duty frame signal. The driver 201 and the voltage generator 184 supply voltage.

  Next, the timing at which a voltage should be applied for gradation display will be described with an example. Here, a case where a display body that uses liquid crystal as a material and reflects light to display an image will be described as an example.

  For example, as shown in FIG. 9, it is assumed that a voltage corresponding to pixel information “0” (black) is applied to SEG_out1. In this case, “+40 V” is applied to the first time division section, and “+20 V” is applied to the second to fourth time division sections. In this case, the display body 260 reflects white in the first time division section. Subsequently, in the second, third, and fourth time division sections, the display body 260 becomes black according to the accumulated time during which the voltage is applied. That is, the reflectance of the display body 260 decreases according to the voltage and time.

  Further, it is assumed that a voltage corresponding to pixel information “3” (white) is applied to SEG_outn. In this case, “+40 V” is applied to the first time division section, and “+0 V” is applied to the second to fourth time division sections. In this case, the display body 260 is reflected in white in the first time-division section, and the display body 260 is also reflected in white in the subsequent time-division section.

These display methods are based on the characteristics of the display body 260.
FIG. 10 is a diagram illustrating an example of characteristics of the display body according to the second embodiment.
The relationship between the applied voltage (V) and the reflectance (R) in the display body 260 is, for example, a characteristic 260a shown in FIG. For example, when “+40 V” is applied to the display body 260, the reflectance becomes the maximum value, and the display body 260 can be reflected white.

  Next, when the intermediate potential “+20 V” is applied from the state where “+40 V” is applied to the display body 260, the reflectivity varies depending on the accumulated time. This is because the reflectance varies depending on the energy applied to the display body 260. For example, the reflectance (R) depends on the applied voltage (V) and the accumulated time (ms) as shown by the characteristic 260b in FIG. For example, the reflectance (R) is expressed by the following formula.

Reflectivity = (applied voltage) ² x (time)
Thus, in the display body 260, the reflectivity decreases according to the cumulative time during which the intermediate potential “+20 V” is applied. This characteristic is used in the gradation display method in the second embodiment.

Next, the reading operation of the image display apparatus 100 will be described.
As the scanner module 140 moves, the scanner device 210 moves the information on the display body 260 and sequentially reads the images on the common line of the display body 260 located below. The reading of the image is performed by receiving reflected light, for example.

  Then, the scanner device 210 converts the read image into image information. Conversion to image information is performed, for example, by digitizing received light according to wavelength and intensity. The image information converted by the scanner device 210 is sequentially written to the storage medium by the storage medium reader / writer 190 under the control of the device control 180.

  When the scanner module 140 moves in the range from the highest point to the lowest point and the scanner device 210 moves all over the display body 260, reading of the image displayed on the display body 260 is completed.

Next, a processing procedure when the buttons 231 to 233 are pressed in the image display apparatus 100 will be described.
First, a procedure when the “next page” button 231 is pressed will be described.

FIG. 11 is a flowchart illustrating an example of a processing procedure of the image display apparatus according to the second embodiment.
The following processing is started when the button 231 is pressed.

  [Step S10] The device control 180 determines whether or not the position of the scanner module 140 is the highest point. If the position of the scanner module 140 is the highest point, the device control 180 advances the process to step S13. If the position of the scanner module 140 is not the highest point, the device control 180 advances the process to step S11.

  [Step S11] The device control 180 determines whether the position of the scanner module 140 is the lowest point. If the position of the scanner module 140 is the lowest point, the device control 180 advances the process to step S17. If the position of the scanner module 140 is not the lowest point, the device control 180 advances the process to step S12.

[Step S12] The device control 180 moves the scanner module 140 to the highest point.
[Step S13] The device control 180 starts the downward movement of the scanner module 140.

[Step S14] The device control 180 detects one common electrode of the plurality of common electrodes 250 by the voltage detection rollers 300 and 310.
[Step S15] The device control 180 executes an image writing operation for the next page for one line corresponding to the common electrode detected in Step S14.

  [Step S16] The device control 180 detects whether the common electrode detected in step S14 is the lowest electrode. If the detected common electrode is the lowest electrode, the device control 180 advances the process to step S21. If the detected common electrode is not the lowest electrode, the device control 180 advances the process to step S14.

[Step S17] The device control 180 starts the upward movement of the scanner module 140.
[Step S18] The device control 180 detects one common electrode among the plurality of common electrodes 250 by the voltage detection rollers 300 and 310.

[Step S19] The device control 180 executes an image writing operation for the next page for one line corresponding to the common electrode detected in Step S18.
[Step S20] The device control 180 detects whether or not the common electrode detected in step S18 is the highest electrode. If the detected common electrode is the uppermost electrode, the device control 180 advances the process to step S21. If the detected common electrode is not the uppermost electrode, the device control 180 advances the process to step S18.

[Step S21] The device control 180 stops the movement of the scanner module 140 and ends the process.
By such a procedure, the image displayed on the display body 260 can be rewritten to the image of the next page.

Next, a procedure when the “Copy” button 232 is pressed will be described.
FIG. 12 is a flowchart illustrating an example of a processing procedure of the image display apparatus according to the second embodiment.

The following processing is started when the button 232 is pressed.
[Step S30] The device control 180 determines whether the position of the scanner module 140 is the highest point. If the position of the scanner module 140 is the highest point, the device control 180 advances the process to step S33. If the position of the scanner module 140 is not the highest point, the device control 180 advances the process to step S31.

  [Step S31] The device control 180 determines whether the position of the scanner module 140 is the lowest point. If the position of the scanner module 140 is the lowest point, the device control 180 advances the process to step S34. If the position of the scanner module 140 is not the lowest point, the device control 180 proceeds with the process to step S32.

[Step S32] The device control 180 moves the scanner module 140 to the highest point.
[Step S33] The device control 180 starts moving the scanner module 140 downward.

[Step S34] The device control 180 starts the upward movement of the scanner module 140.
[Step S35] The device control 180 starts an image reading operation using the scanner device 210.

[Step S36] The device control 180 stops the movement of the scanner module 140.
[Step S37] The device control 180 stops the image reading operation using the scanner device 210 and ends the processing.

  With such a procedure, it is possible to read the image displayed on the display 260, the writing on the clear sheet 130, and the writing on the paper attached to the clear sheet 130.

Next, a procedure when the “next page / copy” button 233 is pressed will be described.
FIG. 13 is a flowchart illustrating an example of a processing procedure of the image display apparatus according to the second embodiment.

The following processing is started when the button 233 is pressed.
[Step S40] The device control 180 determines whether the position of the scanner module 140 is the highest point. If the position of the scanner module 140 is the highest point, the device control 180 advances the process to step S42. If the position of the scanner module 140 is not the highest point, the device control 180 proceeds with the process to step S41.

[Step S41] The device control 180 moves the scanner module 140 to the highest point.
[Step S42] The device control 180 starts moving the scanner module 140 downward.

[Step S43] The device control 180 starts an image reading operation using the scanner device 210.
[Step S44] The device control 180 detects one common electrode among the plurality of common electrodes 250 by the voltage detection rollers 300 and 310.

[Step S45] The device control 180 executes an image writing operation for the next page for one line corresponding to the common electrode detected in Step S44.
[Step S46] The device control 180 detects whether the common electrode detected in Step S44 is the lowest electrode. If the detected common electrode is the lowest electrode, the device control 180 advances the process to step S47. If the detected common electrode is not the lowest electrode, the device control 180 advances the process to step S44.

[Step S47] The device control 180 stops the movement of the scanner module 140.
[Step S48] The device control 180 stops the image reading operation using the scanner device 210 and ends the processing.

  By such a procedure, the image displayed on the display body 260, the writing on the clear sheet 130, and the writing on the paper attached to the clear sheet 130 are read, and the image of the next page is written on the display body 260. Is possible. That is, image reading and image writing can be performed simultaneously.

  As described above, in the image display apparatus 100, the scanner module 140 is provided with the voltage supply rollers 280 and 290 that sequentially supply voltages to the plurality of common electrodes 250 as the scanner module 140 moves. As a result, it is not necessary to provide a driving device for driving the plurality of common electrodes 250 on the board 110, so that the area of the board 110 can be reduced and the image display device 100 can be reduced in size.

  Further, in the image display apparatus 100, the scanner device 210 is provided in front of the voltage supply rollers 280 and 290 in the moving direction of the scanner module 140. Thereby, after the image displayed by the scanner module 140 is read on a part of the display body 260, writing by the voltage supply rollers 280 and 290 is performed. Therefore, the reading operation and the writing operation can be performed by moving the scanner module 140 once, and the operation can be speeded up.

  Further, in the image display device 100, the voltage supply rollers 280 and 290 supply voltage to both ends of the plurality of common electrodes 250. Thereby, it becomes possible to supply a voltage equally to each of the plurality of common electrodes 250 within the electrodes. That is, it is possible to reduce the influence of the voltage drop due to the length of the electrode.

DESCRIPTION OF SYMBOLS 10 Image display apparatus 11 Board 12 Display body 13,14 Several electrode 15 Transparent base material 16 Moving body 17 Reading part 18 Voltage supply part

Claims (9)

A display for displaying an image;
A plurality of first electrodes stacked on the display surface of the display body and extending in a first direction and spaced apart from each other in a second direction intersecting the first direction; and on the display surface of the display body A plurality of second electrodes stacked and extending in the second direction and spaced apart from each other in the first direction, based on voltages supplied to the plurality of first and second electrodes An electrode group in which an image is displayed on the display body;
A transparent base material arranged on the display surface of the display body and written by handwriting; and
A movable body that is disposed across the transparent base material on the display surface of the display body and moves the display surface of the display body in the second direction;
A reading unit provided in the moving body, extending in the first direction, and reading an image displayed on the display body by movement of the moving body and writing on the transparent substrate;
A voltage supply unit that is provided in the moving body and supplies a voltage in turn to each of the plurality of first electrodes as the moving body moves;
An image display device comprising:   The image display device according to claim 1, wherein the reading unit is provided in the moving direction ahead of the voltage supply unit in the second direction with respect to the moving body.   The image display device according to claim 1, wherein the voltage supply unit supplies a voltage from both ends or one end of each of the plurality of first electrodes.   The voltage supply unit includes a voltage supply roller having a surface serving as an electrode, and the voltage supply roller rotates in accordance with the movement of the movable body and sequentially contacts each of the plurality of first electrodes. 4. The image display device according to claim 1, wherein a voltage is sequentially supplied to each of the plurality of first electrodes. 5. The moving body includes a shaft extending in the first direction, and a voltage detection roller attached to the shaft.
The voltage supply roller is attached to the shaft,
The surface of the voltage detection roller is an electrode, and the voltage detection roller rotates in accordance with the movement of the moving body and sequentially contacts each of the plurality of first electrodes, whereby the plurality of first electrodes Among the electrodes, a first electrode that is a target of voltage supply by the voltage supply roller is detected,
The image display device according to claim 4, wherein a voltage based on image information corresponding to the first electrode detected by the voltage detection roller is supplied to the plurality of second electrodes. The moving body has an electrode detection unit that detects a first electrode that is a target of voltage supply by the voltage supply unit after the plurality of first electrodes,
5. The voltage based on image information corresponding to the first electrode detected by the electrode detection unit is supplied to the plurality of second electrodes. 6. Image display device.   The image display device according to claim 1, wherein a sheet on which writing has been performed is attached to the transparent base material.   The image display device according to claim 1, wherein the display body displays an image by reflection of light. A display for displaying an image;
A plurality of first electrodes stacked on the display surface of the display body and extending in a first direction and spaced apart from each other in a second direction intersecting the first direction; and on the display surface of the display body A plurality of second electrodes stacked and extending in the second direction and spaced apart from each other in the first direction, based on voltages supplied to the plurality of first and second electrodes An electrode group in which an image is displayed on the display body;
A transparent base material arranged on the display surface of the display body and written by handwriting; and
A movable body arranged with the transparent base material sandwiched between display surfaces of the display body;
A reading unit provided on the moving body and extending in the first direction;
A voltage supply unit provided in the moving body;
In an image display method of an image display device having
The moving body moves the display surface of the display body in the second direction;
The reading unit reads the image displayed on the display body and the writing on the transparent substrate;
The voltage supply unit sequentially supplies a voltage to each of the plurality of first electrodes;
An image display method characterized by the above.

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