JP2004317550A - Display data writing device and method for displaying picture using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily write display a data on an inexpensive display medium which has no drive circuits for scanning electrodes and for data electrodes inside the display medium. <P>SOLUTION: The display data is written a sheet shaped display medium 11, on which a plurality of pixels equipped with a pair of electrodes 55, 53 to impart an electric field to a medium material 51 for display are arranged in a matrix form, by continuously or intermittently moving a writing device, while being in contact with the display medium, comprising a writing device having a contact 32 for lines to be attachably and detachably brought into contact with a line electrode terminal to apply a writing voltage thereto, and a contact 31 for data to be attachably and detachably brought into contact with a data electrode terminal in the display medium to apply a data voltage thereto. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display data writing device for writing display data on a display medium called electronic paper, paper-like display, rewritable paper, or the like, and an image display method using the same.
[0002]
[Background of technology]
In recent years, with the development of information equipment, a light-weight and thin display device with low power consumption has been demanded. In particular, in order to reduce power consumption, research and development of a reflective display device that does not use components such as a backlight and a polarizing plate are actively performed. Notebook PCs, mobile PCs, and the like are increasingly used in daily life, and low power consumption, small size, light weight, and high definition are being actively used in order to enable the perusal of text and carry a large amount of image data. Among them, research and development of so-called electronic paper for the purpose of still image display have been actively pursued in order to reduce power consumption.
[0003]
Recently, a display technology with low power consumption and good visibility without using components such as a backlight and a polarizing plate has been proposed. However, when such a thin substrate is used as a display medium, a low voltage of an image rewriting system is required. There is a demand for low power consumption, miniaturization, and robustness of the display medium itself.
[0004]
As an example of the above-mentioned display medium, there is one based on electrophoresis. Image display devices utilizing the electrophoretic phenomenon of migrating particles by an electric field formed by applying a voltage to an electrode pair provided in each pixel are described in Patent Documents 1 to 3 and the like.
[0005]
On the other hand, an electrophoretic sheet provided with a common electrode at the center and capable of displaying images on both sides is disclosed in Patent Document 4 and the like.
[0006]
[Patent Document 1]
JP-A-10-62824 [Patent Document 2]
JP-A-10-90732 [Patent Document 3]
JP 10-149118 A [Patent Document 4]
JP 2002-287180 A
[Problems to be solved by the invention]
However, a display device generally includes a display panel module in which a scan electrode drive circuit and a data electrode drive circuit are mounted on a passive or active matrix panel having pixels in which scan electrodes and data electrodes are connected in a matrix. Make up. There is a low-temperature polysilicon TFT type display panel in which these drive circuits are formed together with pixel transistors, but in any case, the scan electrode drive circuit and the data electrode drive circuit occupy much of the manufacturing cost.
[0008]
On the other hand, some display media display images by changing the optical state of the display medium without providing electrodes, but the image quality is poor, and high heat or high voltage is required for writing data. , Its controllability is not satisfactory. For example, when an electric field is applied from the electrode on the outer surface of the display medium, a voltage as high as about 1000 V is higher than when an electric field is applied directly to the migrating particles from the electrode provided on the inner surface of the display medium. Was needed. In addition, when an electric field is applied from the outside, the migration direction of the particles is limited to the vertical direction, and there is a disadvantage that the method cannot be applied to a display sheet that migrates in the horizontal direction.
[0009]
(Object of the invention)
An object of the present invention is an inexpensive display medium having no scan electrode driving circuit or data electrode driving circuit inside a display medium, a display data writing device capable of easily writing display data, and an image using the same. It is to provide a display method.
[0010]
[Means for Solving the Problems]
(Means 1) A plurality of pixels each having an electrode pair for applying an electric field to the display medium are arranged in a matrix, and a line electrode terminal connected to one of the electrode pairs; A data electrode terminal connected to the other, a display data writing device that writes display data to a sheet-shaped display medium having:
An exposing line contact for detachably contacting the line electrode terminal of the display medium to apply a writing voltage, and detachably contacting the data electrode terminal of the display medium to apply a data voltage. And an exposing data contactor for applying.
For the display medium, while contacting the writer, while moving continuously or intermittently, while sequentially applying the write voltage to the plurality of line electrode terminals from the line contact, The line contact and the data contact are arranged in the same direction so that the data voltage can be selectively applied to the plurality of data electrode terminals from the data contact. It is characterized by the following.
[0011]
Here, it is preferable to perform line detection before applying the write voltage from the line contact. In this case, accurate writing can be performed.
[0012]
It is preferable that the apparatus further includes a communication unit that performs data communication with an IC chip mounted on the display medium for providing or processing data associated with an image to be displayed. In this case, writing of display data, which requires power and is low speed, can be directly performed by a contact type, low power consumption is high speed, and other data communication can be separately performed to the IC chip by wireless or the like.
[0013]
(Means 2) An image display method in which display data is written on the display medium by moving the display data writing device while contacting the display medium with the sheet-like display medium, and an image is displayed.
The display data writing device according to the first aspect is used.
[0014]
Here, it is preferable to perform data communication with an IC chip for providing or processing data associated with an image to be displayed, which is mounted on the display medium.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0016]
(Embodiment 1)
A display medium according to an embodiment of the present invention, a display data writing device therefor, and an image display method using them will be described with reference to FIGS.
[0017]
In the present embodiment, as a display medium, a sheet-like display medium having a memory property using electrophoresis will be described as an example, but the present invention is not limited to this.
[0018]
FIG. 1 schematically shows a state in which display data is written on a display sheet 11 as a display medium by using an electric writing device 12. During a writing operation, a writing device is written on the display sheet 11 like a handy scanner. The device 12 is used by moving the device 12 continuously or intermittently in the direction of the arrow while contacting the display sheet 11.
FIG. 2 shows a sectional structure of the display data writing device and the display sheet.
[0019]
In FIG. 2, a display sheet 11 is rewritable electronic paper such as an electrophoretic display sheet, and a writing device 12 applies a write signal to the display sheet while moving on the display sheet like a handy scanner, for example. Writing means 21 having exposed contacts, which are electrical contacts for transmitting a writing signal, for writing display data, and a front rotating roller for allowing the writing device 12 to smoothly move in contact with the display sheet. The reference numeral 22 and the rear rotating rollers 23 and 24 are electrodes having a contact surface provided on one outer surface of the display sheet 11.
In addition, the device 12 also includes a reflective photo-interrupter 25 as a detection unit for detecting the presence or absence of the display sheet 11 on the contact surface side with the display sheet.
[0020]
While the distance between the display sheet 11 and the writer 21 is regulated to some extent by the two rollers 22 and 23, the writer 21 is moved continuously manually or intermittently at appropriate steps. . During this movement, the contact of the writer 21 and the contact surface of the electrode 24 come into releasable contact. At this time, electrical continuity is established by the contact. At this time, by applying a write signal voltage from the writer 21 to the display sheet 11, the electrophoretic particles held inside the display sheet 11 are moved by the electric field to write data. And display the image. Since the display sheet 11 has a memory property, the display state does not change even after the contact is separated from the electrode.
[0021]
FIG. 3 is a diagram of the writing unit 21 used in the present embodiment as viewed from the lateral direction. In FIG. 3, reference numeral 31 denotes a number of data contacts arranged in a line in the center of the writing means 21, and 32 denotes a pair of line contacts arranged at both ends of the data contact row. The data contact 31 and the line contact 32 are formed of a protrusion such as a cone or a pyramid made of a conductor such as a metal, and are connected to a data driver or a line driver for applying a write signal voltage. . The writing device 21 is applied to the plurality of line electrode terminals 54 sequentially from the line contact 32 while moving the writing device 21 continuously or intermittently while making contact with the display sheet 11. The line contact 32 and the data contact 31 are arranged in the same direction so that a data voltage can be selectively applied to the plurality of data electrode terminals 52 from the data contact 31. It is characterized by having. The shape of the contact may be a rotatable gear or pulley.
[0022]
Here, the data contact 31 and the line contact 32 always face the writing surface side (downward in FIG. 2) of the device 12 and are exposed to the outside so that writing can be performed. Listed. However, the present invention is not limited to this mode. When not in use, the data contact 31 and the line contact 32 are covered with a protective cover or the like. The contact may be removed manually or automatically to expose the contact.
[0023]
FIG. 4 is a view of the display sheet of the present embodiment as viewed from one surface. In FIG. 4, reference numeral 41 denotes a data electrode wiring having a shape in which a plurality of stripes are arranged in parallel at the center of the sheet, and 42 is arranged from one end of one outer surface of the display sheet to the opposite end. This is a line electrode wiring having a stripe shape.
[0024]
As described above, the display sheet is a driverless matrix display sheet which has matrix wiring but is not physically connected to a data driver or a line driver.
[0025]
FIG. 5 is an enlarged view of a part of the display sheet according to the first embodiment of the present invention. In FIG. 5A, reference numeral 51 denotes a display medium having a memory property such as an electrophoretic particle layer, and 52 denotes a transparent data electrode terminal connected to a transparent data electrode 53. The electrode terminal 52 constitutes the data electrode wiring 41. Reference numeral 54 denotes a line electrode terminal which is connected to the line opaque electrode and provides a contact surface which is detachably contacted with the contact 32. The line electrode terminal 54 and the line opaque electrode constitute the line electrode wiring 42. . The line electrode wiring 42 extends from one end of the outer surface of the display sheet to the end opposite to the outer surface of the display sheet via the inner surface of the insulating substrate on the display surface side. The electrodes 24 in FIG. 2 mean the data electrode terminals 52 and the line electrode terminals 54.
[0026]
The line electrode wiring 42 gives a predetermined potential to the surface side of the electrophoretic particle layer 51 by an opaque transparent electrode also serving as a pixel electrode. The data electrode wiring 41 gives a predetermined potential to the back side of the electrophoretic particle layer 51 by a transparent data electrode 53 also serving as another pixel electrode.
[0027]
The line contact 32 is brought into contact with the line electrode terminal 54, and at the same time, the data contact 31 is brought into contact with the data electrode terminal 52. Then, a voltage for writing data is applied to the pair of pixel electrodes including the transparent electrode 55 and the data electrode 53 from the contacts 31 and 32. If this is a voltage exceeding a threshold for switching the display state of the pixel, the optical state of the pixel changes. The principle is well known. In the embodiment of FIG. 5A, the image is on the data electrode wiring 41 side, and the image can be visually recognized from here.
[0028]
On the other hand, FIG. 5B shows a cross section of a display sheet in which a part of the line electrode wiring 42 is formed as a transparent electrode 55 and the other side is a surface on which an image can be visually recognized.
[0029]
Regardless of the display sheet shown in FIG. 5A or 5B, only the pixel on the line electrode wiring 42 that is in contact with the line contact 32 and forms a closed circuit is the target pixel for data writing. Therefore, by sequentially switching the contacting line electrode wirings 42 in time series, data can be written to all the pixels in a line-sequential manner.
[0030]
In addition, if the two line contacts 32 are simultaneously brought into contact with the line electrode terminals 54 at both ends and the electrical state at that time is detected, a line (scanning line) of a pixel to which data is to be written can be detected.
[0031]
Therefore, as described later, if the process of applying the write voltage after detecting the line position is repeated while moving the device 12 continuously or intermittently on the display sheet 11, the synchronization of the sheet conveyance and the line sequential write can be achieved. And also prevents erroneous writing.
[0032]
The data electrode terminal 52 and the line electrode terminal 54 are formed of Cr, Ni, Al formed by a vapor deposition method such as sputtering or CVD, a plating method such as electroplating or electroless plating, or a coating method using a conductive paste. , Cu, Au, Ag or the like or a conductor such as an alloy containing them as one component. In particular, the data electrode terminal 52 may have a stripe-shaped exposed surface in which the contact surface with the contact is continuous in the column direction. Only the portion overlapping the line electrode is exposed, and the contact surface is intermittent in the column direction. It may be a configuration that is physically exposed. However, when the data electrode terminal 52 side is used as a surface for recognizing an image, the data electrode wiring on the display screen is made of a transparent conductor such as tin oxide, indium oxide, zinc oxide, iridium oxide, or ITO. Should be formed.
[0033]
The display medium 51 used in the present invention may be an electrophoretic layer formed by dispersing electrophoretic particles in a dispersion medium, or a colored particle having at least two surfaces having different charging characteristics and colors. May be a colored particle layer in which a large number of are arranged.
[0034]
Of course, the display medium 51 used in the present invention is not limited to the one utilizing the electrophoresis phenomenon. For example, a liquid crystal display medium such as a polymer dispersed liquid crystal and a cholesteric liquid crystal, an electrochromic display medium, and the like may be used. A display medium having memory properties is particularly preferably used because the element configuration is simplified as described later.
[0035]
A rigid or flexible sheet of glass or resin is preferably used as a substrate on which various electrodes are formed and which is used to hold a display medium. As long as the substrate on which an image is displayed is transparent, an opaque substrate can be used otherwise.
[0036]
With reference to FIG. 6, the line drive voltage waveform and the data voltage waveform used in the present invention will be described.
[0037]
6, reference numeral 61 denotes a line drive voltage waveform for one cycle, 62 denotes a voltage for erasing an image, 63 denotes a voltage for writing data for image display, and 64 denotes a line detection voltage. The line drive voltage waveform 61 is a line selection waveform for determining the optical state of the pixels arranged in one row, and corresponds to a so-called scanning-side signal.
[0038]
This waveform 61 is output from one side of the pair of line contacts 32.
[0039]
First, a line detection voltage 64 is output from one of the line contacts 32.
[0040]
If both the line contacts 32 and the line electrode wiring 42 are in contact with each other, the voltage of the line electrode detection portion 64 is detected from the line contact 32 that does not output the line detection voltage 64. Is done.
[0041]
When this voltage is detected, first, the erasing voltage 62 is applied, and the display of the pixels on one line is set to the all black state regardless of the display state at that time. Next, a data writing voltage 63 is applied. At the same time, a data voltage 66 is applied from the data contact 31 to each data electrode wiring. Is determined. That is, if the combined voltage exceeds the threshold voltage for displaying white, the pixels erased to the black state transition to the white state. Reference numeral 67 denotes a compensation voltage provided as needed, and is used when the characteristics of the display medium and the pixel structure are deteriorated by the application of the DC voltage.
[0042]
By repeating such an operation for each line while feeding the sheet, data can be written to the pixels on the selected line. The line detection may be replaced by a method of optically detecting a line to be selected, in addition to the detection of an electric signal as described above.
[0043]
FIG. 7 is a schematic diagram showing a pixel configuration used in the present invention.
[0044]
FIG. 7A schematically shows a cross section of a pixel for black display, and FIG. 7B schematically shows a cross section of a pixel for white display. 7, reference numeral 271 denotes an insulating substrate made of an upper transparent substrate; 55, a transparent electrode; 273, microcapsules filled with an insulating liquid; 274, white electrophoretic particles; 53, a data electrode; An insulating base made of
[0045]
At the time of erasure to the all-black state, the white electrophoretic particles 274 move downward and stay there, thereby exhibiting a black optical state.
[0046]
At the time of data writing, when a voltage equal to or higher than the threshold is applied, the white electrophoretic particles 274 move upward and stay there, and exhibit a white optical state when viewed from above.
[0047]
In the above, the case of the embodiment of FIG. 5B is exemplified. However, when the embodiment of FIG. 5A is adopted, the reference numeral 53 in FIG. Become.
[0048]
A display data writing device according to an embodiment of the present invention will be described with reference to FIGS.
[0049]
FIG. 8 is a flowchart of an image display method using the display medium and the display data writing device described above, and FIG. 9 is a block diagram of a drive control system of the display data writing device.
[0050]
9, 31 and 32 are the same as in FIG. 3, 81 is an image data output device such as a PC for sending data to be written from the outside, 82 is an input interface, 83 is a device that processes data and simultaneously controls the entire device. MPU as a control device, 84 as a RAM as a memory for temporarily storing data, 85 as a ROM as a memory for storing a program of the MPU, 86 as an encoder for detecting the rotation of the roller, 87 as an addition to the data contact 31 A data driver that generates a data voltage waveform, 88 is a line driver that generates a line drive voltage waveform to be applied to the line contact 32, 89 is a line sensor that detects the line detection voltage 64, and 90 is a line sensor that contacts the electronic paper 11. , Rotating rollers (22, 23) and 94 for smoothing the movement of the writer 21 are sheet sensors. That.
[0051]
As shown in FIG. 8, in step 71, a write instruction and image data to be written are received from an external device 81 through an input interface. In the MPU, data to be written is developed in the RAM 84.
[0052]
Next, in step 72, the presence of the display sheet is optically detected by the reflective interrupter 93, and the sheet sensor 94 generates a detection signal indicating the presence of the display sheet.
[0053]
When the writing device 12 is placed on the display sheet, the light emitted from the LED of the reflective interrupter 93 is reflected by the display sheet 11 and the reflected light is detected by the photosensor of the reflective interrupter 93. This detection light is photoelectrically converted, and the presence of the display sheet is determined by the sheet sensor 94.
[0054]
At almost the same time when the display sheet is detected, at step 73, the line driver 88 is turned on, and the voltage 64 is supplied from the one line contact 32. When the line contact 32 contacts the line electrode terminal of the display sheet due to the movement of the device 12, the line detection voltage supplied to one of the line contacts 32 passes through the transparent electrode 55 and the other line contact. It reaches 32. This voltage is detected by the MPU using the line sensor 89. Upon detection, in step 75, the MPU issues a command to the line driver 88, and the line driver 88 outputs the erasing voltage 62 for erasing pixels on the line of the display sheet 11.
[0055]
Next, at step 76, a data write voltage 63 to be written on the display sheet 11 is output from the line driver 88. The display data of the pixels on the first line is transferred to the data driver 87 in advance from the RAM, and is simultaneously output to the data contacts 31 corresponding to the pixels to be displayed in white by the RAM. Is written on the display sheet.
[0056]
While moving the writing device 12, steps 74 to 76 are repeated until the end of the display sheet is detected by the sheet sensor 94 in step 77. At this time, every time the number of lines detected from the display sheet is incremented, the number of lines of data transferred from the RAM is also incremented.
[0057]
Thus, the writing operation on the display sheet is completed.
[0058]
According to the above-described embodiment, the display medium does not have a so-called driver IC, so that it can be manufactured at low cost and is suitable as a substitute for paper suitable for mass consumption.
[0059]
When directly applying an electric field to the display medium from an electrode or a contact provided outside the insulating base material, a high voltage was required, but since the electrode is located near the display medium of the present embodiment, A high electric field can be applied at a low voltage, and a power-saving writing device can be provided.
[0060]
If a TFT is formed inside the sheet as required, a constant voltage can be applied for a long time by writing in a short time, and the display writing time can be remarkably shortened.
[0061]
The direction in which the electric field is applied to the electrophoretic particles can be freely set not only in the vertical direction but also in a display sheet in which the particles migrate in the horizontal direction, as described later.
[0062]
Since the upper and lower electrodes are fixed inside the sheet, the display is stable and the sheet can withstand bending.
[0063]
(Embodiment 2)
This embodiment is a display medium employing a pixel structure different from that of FIG. Other configurations are almost the same as the first embodiment.
[0064]
10A and 10B show a cross section of an element configuration of another embodiment of the electrophoretic display device, wherein FIG. 10A shows a white display state and FIG. 10B shows a black display state.
[0065]
Each pixel has a pair of electrodes 296 and 297. In the case where the black migrating particles 292 are charged to the positive electrode (a), the migrating particles 292 are concentrated near the counter electrode 296, and from the observer, The color of the insulating layer 294 or the display electrode 297 (when the insulating layer 294 is transparent) is generally recognized. In (b), the migrating particles 292 are arranged so as to spread on the display electrode 297, so that the observer generally recognizes the black color of the migrating particles.
[0066]
For example, when data is rewritten using black electrophoretic particles, an appropriate driving voltage is applied between the pair of electrodes 296 and 297 from the driving power supply 298 in the state of FIG. The state transitions to the state of FIG. 10A (white display state). That is, a change in the area occupied by the migrating particles in the pixel indicates a white display state, a black display state, and a gray scale display state intermediate therebetween.
[0067]
In this case, since a pair of electrodes serving as the line electrode wiring and the data electrode wiring are provided on the inner surface side of the base material 293, the pair of electrodes are formed on the base material 293 using an interlayer insulating film. Then, a plurality of data electrode terminals as shown in FIG. 4 may be provided in parallel on the back surface, that is, the outer surface of the base material 293, along the columns, and the line electrode terminals may be arranged at the ends. The method of applying the data electrode terminal drive voltage is the same as in the first and second embodiments.
[0068]
In the present invention, the color of the particles is not limited to black or white, but may be a combination of a dispersion medium and particles of other colors. For example, color display can be performed by using particles of each color of RGB instead of white particles. Alternatively, color display can be performed by using a YMC liquid instead of a black liquid.
[0069]
The present invention can be applied to various combinations of a display sheet having electrodes and a writing device having a driver capable of driving matrix wiring.
[0070]
For example, if a card-size display sheet and a card writing device are used, it can be applied to customer management for each store, etc., and if a card-size display sheet and a writing device are used, purchase records and balance display can be performed by store customers. It can be applied to accounting systems that also serve as management.
[0071]
Further, an IC chip capable of high-speed non-contact data communication is mounted on the display sheet, billing information and data for protecting billing information are stored in the IC chip, and a data writing device performs data communication with the IC chip. A known charging process is performed by mounting the means. Then, if the state of the billing process is generated as image data and the display medium is driven based on the image data, the state of the billing process (such as the usage fee or the balance) can be displayed on the display medium. Such a system is an IC cash card system or an IC prepaid card system with a display function, that is, the IC chip communicates with the communication means, and the writing device generates an image associated with the data provided or processed by the IC chip. However, it is possible to realize an image display method having a billing function of displaying it on a display medium. In particular, it is also preferable that an antenna for wireless communication is formed on an IC chip or a display sheet so that data communication with a writing device can be separately performed wirelessly during writing of display data.
[0072]
Alternatively, if the writing device has an image memory and the image stored in the memory is written on the display medium, there is no need to carry around, for example, 1000 documents, and lacks the robustness and lightness of a notebook PC. There is no need to carry the device, and it is also possible to carry the desired reading material and browse it anywhere.
[0073]
【The invention's effect】
According to the present invention, there is provided a display data writing apparatus capable of easily writing display data on an inexpensive display medium having no scan electrode driving circuit or data electrode driving circuit inside the display medium, and an image display method using the same. Can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overview of a display medium and a display data writing device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing a cross-sectional structure of a display medium and a display data writing device according to an embodiment of the present invention.
FIG. 3 is a schematic side view showing an example of a writing unit used in the present invention.
FIG. 4 is a schematic plan view of a display medium used in the present invention.
FIG. 5 is a schematic sectional view of a part of a display medium used in the present invention.
FIG. 6 is a diagram showing a line drive voltage waveform and a data voltage waveform used in the present invention.
FIG. 7 is a schematic sectional view showing an example of a pixel structure of a display medium used in the present invention.
FIG. 8 is a flowchart illustrating the operation of the display data writing device used in the present invention.
FIG. 9 is a schematic block diagram of a display data writing device used in the present invention.
FIG. 10 is a schematic sectional view showing another example of the image structure of the display medium used in the present invention.
[Explanation of symbols]
11 Display sheet (display medium)
12 Writer 21 Writer 31 Data contact 32 Line contact 41 Data electrode wiring 42 Line electrode wiring 51 Display medium 52 Data electrode terminal 53 Data electrode 54 Line electrode terminal

Claims (5)

A plurality of pixels each including an electrode pair for applying an electric field to the display medium are arranged in a matrix, and a line electrode terminal connected to one of the electrode pairs and a pixel electrode connected to the other of the electrode pairs. A data electrode terminal, and a display data writing device that writes display data to a sheet-shaped display medium having:
An exposing line contact for detachably contacting the line electrode terminal of the display medium to apply a writing voltage, and detachably contacting the data electrode terminal of the display medium to apply a data voltage. And an exposing data contactor for applying.
For the display medium, while contacting the writer, while moving continuously or intermittently, while sequentially applying the write voltage to the plurality of line electrode terminals from the line contact, The line contact and the data contact are arranged in the same direction so that the data voltage can be selectively applied to the plurality of data electrode terminals from the data contact. A display data writing device characterized by the above-mentioned. The display data writing device according to claim 1, wherein line detection is performed before applying the writing voltage from the line contact. 2. The display data writing device according to claim 1, further comprising communication means for performing data communication with an IC chip mounted on the display medium for providing or processing data associated with an image to be displayed. An image display method in which display data is written on the display medium and an image is displayed by moving the display data writing device while contacting the display medium with a sheet,
An image display method using the display data writing device according to claim 1. 5. The image display method according to claim 4, wherein data communication is performed with an IC chip mounted on the display medium for providing or processing data associated with an image to be displayed.

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