JP4529385B2 - Image display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present inventionPictureThe present invention relates to an image display device, and in particular, by applying a voltage according to an image between substrates, it is possible to repeatedly rewrite the image by moving colored particles.PictureThe present invention relates to an image display device.
[0002]
[Prior art]
In recent years, in addition to paper and electronic display devices, what is called electronic paper or digital paper having these advantages has attracted attention as an image display medium.
[0003]
Electronic paper using a reflective, memory-based image display medium has excellent properties such as good visibility in a bright place and low power consumption. The encapsulated electronic paper has a simple configuration, high contrast, and excellent visibility.
[0004]
Among the image display media using such particles, an image display medium in which colored particles are sealed between a transparent display substrate and a back substrate, and an image is displayed using the color of the colored particles and the color of the back substrate. Has been proposed (see, for example, Patent Documents 1 to 4).
[0005]
In these systems, the color of the colored particles is displayed by attaching the colored particles to the display substrate or the back substrate, and the color of the back substrate is changed by moving the colored particles in a partial area between the substrates. It is displayed.
[0006]
Further, in such an image display medium, a gap member having a height of, for example, 10 μm to several hundreds of μm is provided between the display substrate and the back substrate in order to maintain a constant distance between the display substrate and the back substrate. It is common.
[0007]
FIG. 14 shows such an image display medium 100. As shown in FIG. 14, the image display medium 100 includes a display substrate 102 and a back substrate 104, transparent electrodes 106 </ b> A and 106 </ b> B are formed on the display substrate 102, and an insulating layer 108 is further formed. . On the back substrate 104, electrodes 110A and 110B are formed, and a colored layer 112 is further formed. For example, a lattice-like gap member 114 is provided between the display substrate 102 and the rear substrate 104, and the gap member 114 divides the substrates into a plurality of cells 116. In the cell 116, for example, positively charged black particles 118 are enclosed. In FIG. 14, only one cell is shown for ease of explanation.
[0008]
In such an image display medium 100, for example, the electrodes 110 </ b> A and 110 </ b> B are grounded and a negative predetermined voltage is applied to the transparent electrodes 106 </ b> A and 106 </ b> B. It can be moved to and black can be displayed.
[0009]
On the other hand, for example, the electrodes 110A and 110B and the transparent electrode 106A are grounded and a predetermined negative voltage is applied to the transparent electrode 106B, whereby the black particles 118 are gathered on the electrode 110B and colored as shown in FIG. The color of the layer 112 can be displayed.
[0010]
[Patent Document 1]
JP 2002-169191 A
[Patent Document 2]
Japanese Patent Application No. 2002-250214
[Patent Document 3]
JP 2001-174853 A
[Patent Document 4]
JP 2002-162650 A
[0011]
[Problems to be solved by the invention]
In the above prior art, as shown in FIG. 16B, when the color of the colored layer 112 is displayed, the viewer places the image display medium 100 in a direction substantially perpendicular to the display surface (the arrow direction in the figure). When viewed, as shown in FIG. 16A, the color of the colored layer 112 and the black color of the particles can be seen well.
[0012]
However, when the image display medium 100 is viewed from an oblique direction as shown by the arrow direction in FIG. 17B, the color of the wall surface of the gap member 114 is visually recognized as shown in FIG. Therefore, there is a problem that the display differs depending on the viewing angle. In particular, when the display area becomes large, the angle of observation changes depending on the location in the display surface, which is recognized as display unevenness and causes a reduction in image quality. That is, the central portion in the display surface is observed as shown in FIG. 16A, but the vicinity of the end portion in the display surface may be observed as in FIG. Will be recognized as a different color.
[0013]
  The present invention has been made in order to solve the above-described problems. Colored particles are enclosed between a display substrate and a back substrate, and an image is displayed using the color of the colored particles and the color on the back substrate side. Even in this case, it is possible to prevent the image quality from being deteriorated due to the image change depending on the viewing angle.PictureAn object is to provide an image display device.
[0014]
[Means for Solving the Problems]
  In order to solve the above problem, the invention according to claim 1 has translucency.A display-side electrode was formed withA display substrate and the display substrate.And the back side electrode was formed.A back substrate, at least one kind of particle group that is sealed between the substrates so as to be movable between the display substrate and the back substrate, and is different in color from the back substrate, and the display substrate and the back substrate A gap member provided between the substrates and divided between the substrates into a plurality of cells, and a surface in contact with the back substrate is smaller than a surface in contact with the display substrate;The back side electrode is composed of an outer electrode and an inner electrode in the cell.Image display mediumWhen the color of the particle group is displayed, a voltage for moving the particle group to the display substrate side is applied to the display side electrode and the back side electrode to display the color of the back substrate. In this case, voltage applying means for applying a voltage for moving the particle group to the outer electrode side so that the rear substrate is exposed to the display side electrode and the rear side electrode;It is provided with.
[0015]
  According to this invention, it has translucency.A display-side electrode was formed withThe display board is placed facing the display board.And the back side electrode was formed.A group of particles different from the color of the back substrate is enclosed between the back substrate and the substrate. Here, the color of the back substrate includes the color of the colored layer when a colored layer is provided on the back substrate and the color of the back substrate itself.
[0016]
  The particle group is, for example,,A group of particles enclosed between the substrates can be moved in accordance with an electric field formed by a voltage applied between the substrates. That is, a group of particles charged to a predetermined polarity is enclosed between the substrates. Thereby, the voltage according to the image can be applied between the substrates to move the particles and display an image. For example, the color of the particles can be displayed by applying a voltage between the substrates so that all the particles move to the display substrate side. In addition, for example, by applying a voltage that forms an electric field in a direction parallel to the substrate surface, or by applying a predetermined alternating voltage between some of the substrates, particles may be applied to some regions between the substrates. The color of the rear substrate can be displayed by assembling.
[0017]
  Also,in frontThe particle group may be a plurality of types of particle groups having different charging characteristics. As a result, at least three colors or more can be displayed per pixel unit.
[0018]
Alternatively, the particles may be moved by forming magnetic fields between the substrates using magnetic particles.
[0019]
A gap member is provided between the display substrate and the back substrate. As the gap member, for example, a lattice-like member in a plan view, a plurality of stripe-like gap members, or the like can be used. By providing such a gap member between the substrates, the substrates can be held at regular intervals and can be divided into a plurality of cells.
[0020]
  The gap member has a smaller surface in contact with the back substrate than a surface in contact with the display substrate. For this reason, even when the image display medium is viewed from an oblique direction, the image display does not differ depending on the viewing angle, and the image can be displayed with stable quality.
  Also,The back side electrode is comprised in the said cell by the outer side electrode and the inner side electrode. The voltage application means isWhen displaying the color of the particle group, a voltage for moving the particle group to the display substrate side is applied to the display side electrode and the back side electrode to display the color of the back substrate. The particle group so that the back substrate is exposed.On the outer electrode sideVoltage to moveFor the display side electrode and the back side electrodeApply.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0032]
FIG. 1 shows a partial sectional view of an image display medium 10 according to the present embodiment. The image display medium 10 includes a transparent display substrate 12 and a back substrate 14, and the display substrate 12 and the back substrate 14 are disposed to face each other.
[0033]
Transparent electrodes 20A and 20B are formed on the surface of the display substrate 12 facing the back substrate 14, and an insulating layer 21 is further formed. A plurality of divided electrodes 22A and 22B are formed on the surface of the back substrate 14 on the side facing the display substrate 12, and a colored layer 24 having a color (for example, red) different from black, which is the color of particles described later, is further provided. Is formed. The colored layer 24 can be formed using, for example, a method of attaching a colored sheet or screen printing.
[0034]
As the display substrate 12, for example, a transparent glass substrate, a transparent resin film such as PET (polyethylene terephthalate), PC (polycarbonate), acrylic, or a transparent resin sheet can be used. The visible light transmittance is preferably 80% or more.
[0035]
For the back substrate 14, for example, a glass substrate, a resin film, a resin sheet, a metal plate, or the like can be used.
[0036]
The transparent electrodes 20A and 20B and the electrodes 22A and 22B can be made of, for example, ITO (Indium Tin Oxide).
[0037]
The back substrate 14 may be colored in a color different from the color of the particles without providing the colored layer 24 on the back substrate 14 side, or the color of the back substrate 14 itself may be different from the color of the particles. . In this case, the electrodes 22A and 22B are transparent electrodes.
[0038]
Between the display substrate 12 and the back substrate 14, for example, a gap member 16 having a lattice shape when viewed in plan is formed. The gap member 16 maintains the distance between the display substrate 12 and the back substrate 14 and divides the substrate into a plurality of cells 18. For example, a resin or the like can be used for the gap member 16, and it can be formed into a predetermined shape by using embossing, hot press injection molding, photolithography, screen printing, or the like. A plurality of stripe-shaped gap members may be used as the gap member 16. In each figure, for the sake of simplicity, the width of the gap member is schematically drawn in a large proportion. However, the ratio of the width of the gap member to the width of the cell is determined by the gap member between the display substrate and the back substrate. As long as the strength can be maintained, the width and the shape of the lattice are not particularly limited, and any one may be used. However, when the width of the gap member is narrower, the ratio of the exposed area of the particles contributing to the display can be increased, and the display contrast can be improved.
[0039]
The cell 18 is preferably sized in accordance with the size of the display pixel. In addition, there is no particular problem even if a gap is formed between the gap member 16 and the display substrate 12 or the back substrate 14 so that particles do not enter. In FIG. 1, only one cell is shown for ease of explanation.
[0040]
Further, the wall surface 16 </ b> A of the gap member 16 is colored in the same color as the colored layer 24.
For example, after the gap member 16 is formed on the back substrate 14 on which the electrodes 22A and 22B are formed, a paint having the same color as the colored layer 24 is applied by a dipping method or a spray method, or the gap member 16 is applied to the colored layer 24. The wall surface 16A of the gap member 16 can be made the same color as the color of the colored layer 24. Further, the wall surface 16A of the gap member 16 may be made the same color as the color of the colored layer 24 by using a method such as vapor deposition.
[0041]
For example, positively charged black particles 26 are enclosed in the cells 18 formed between the substrates. As the black particles 26, insulating particles or conductive particles can be used. In the case of insulating particles, particles composed of a resin or the like can be used, and those having characteristics that can retain electric charges in a dispersed state in a gas or a liquid are used. In the case of conductive particles, particles composed of gold, carbon, or the like can be used. Moreover, you may use what mixed the binder and the color material.
[0042]
FIG. 2 shows an image display device 30 using the image display medium 10. As shown in FIG. 2, the transparent electrodes 20A and 20B provided on the display substrate 12 are connected to the voltage application unit 32, and the electrodes 22A and 22B provided on the back substrate 14 are grounded. The voltage application unit 32 applies a voltage corresponding to the input image signal to the transparent electrodes 20A and 20B.
[0043]
The voltage application unit 32 includes DC power supplies 34A and 34B and switches 36A and 36B. The switch 36A selectively connects the transparent electrode 20A to the negative terminal 38M or the ground terminal 38G of the DC power supply 34A. The switch 36B selectively connects the transparent electrode 20A to the negative terminal 40M or the ground terminal 40G of the DC power supply 34A.
[0044]
When performing black display, as shown in FIG. 2, the voltage application unit 32 connects the transparent electrode 20A to the minus terminal 38M of the DC power supply 34A and connects the transparent electrode 20B to the minus terminal 40M of the DC power supply 34B. As a result, a predetermined negative voltage is applied to the transparent electrodes 20A and 20B, and the positively charged black particles 26 move to the display substrate 12 side, resulting in black display. Even after the application of the voltage is stopped, the black particles 26 remain attached to the display substrate 12 due to a mirror image force or the like, and the image display is maintained.
[0045]
When displaying the color of the colored layer 24, the voltage application unit 32 grounds the transparent electrode 20A and connects the transparent electrode 20B to the negative terminal 40M of the DC power supply 34B as shown in FIG. Accordingly, a predetermined negative voltage is applied to the transparent electrode 20B, an electric field is formed in a direction parallel to the surface including the image display medium, and the positively charged black particles 26 are in the region on the electrode 22B and toward the display substrate 12 side. Gather. For this reason, the colored layer 24 on the electrode 22A is exposed, and the color of the colored layer 24 can be visually recognized from the display substrate 12 side.
[0046]
At this time, since the wall surface 16A of the gap member 16 is colored in the same color as the color of the colored layer 24, the reflected light 42 from the colored layer 24 and the reflected light 44 from the gap member 16 shown by the solid line in FIG. It becomes light of color. Therefore, even when the image display medium 10 is viewed from an oblique direction as shown by the arrow in FIG. 4B, as shown in FIG. 4A, the conventional example shown in FIG. Thus, the color of the wall surface of the gap member 16 is not displayed. That is, the image does not change depending on the viewing angle, and the image can be displayed with stable quality.
[0047]
In the present embodiment, the transparent electrodes 20A and 20B are provided on the display substrate 12 side, but no electrode is provided on the display substrate 12, and the external electrodes 46A and 46A are provided on the display surface side of the display substrate 12 as shown in FIG. 46B may be provided. The voltage application method in this case is the same as described above.
[0048]
In addition, as shown in FIG. 6, a single moving electrode 48 may be provided outside, and the voltage may be applied by moving on the display substrate 12. In this case, the moving electrode 48 is disposed at a position facing the electrode 22A, the moving electrode 48 is connected to the negative terminal 38M of the DC power supply 34 of the voltage applying unit 32, and a negative voltage is applied to the moving electrode 48 for a predetermined time. Thereafter, the moving electrode 48 is moved to a position facing the electrode 22B, and similarly, a negative voltage is applied to the moving electrode 48 for a predetermined time, whereby the black particles 26 can be moved to the display substrate 12 side, and black display is performed. can do. On the other hand, when displaying the color of the colored layer 24, a negative voltage is applied to the moving electrode 48 while moving the moving electrode 48 from the electrode 22A side to the electrode 22B side in the direction of arrow A in the figure. Thereby, the black particles 26 that have moved to the display substrate 12 side can be moved toward the electrode 22B side by side, and the colored layer 24 can be exposed. In this case, the moving distance of the particles can be controlled by the voltage application time, the exposed area of the colored layer 24 can be controlled stepwise, and gradation control can be facilitated.
[0049]
In the present embodiment, the transparent electrodes 20A and 20B and the electrodes 22A and 22B have the same rectangular shape. However, the present invention is not limited to this, and the electrodes on one side of the substrate may be common without being divided. The number of electrodes on the substrate may be three or more, and the shape of each electrode may be different and can be arbitrarily selected. For example, the transparent electrodes 20A and 20B may have a shape as shown in FIG. That is, a transparent electrode 20B as an outer electrode having a rectangular ring shape is provided around a transparent electrode 20A as a rectangular inner electrode. A single rectangular electrode 22 is provided on the back substrate 14 side and grounded.
[0050]
In this case, when performing black display, as shown in FIG. 8, the voltage application unit 32 connects the transparent electrode 20A to the negative terminal 38M of the DC power supply 34A and the transparent electrode 20B to the ground terminal 40G of the DC power supply 34B. Connect. As a result, a negative predetermined voltage is applied to the transparent electrode 20A, an electric field is formed in a direction parallel to the surface including the image display medium, and the positively charged black particles 26 move to the transparent electrode 20A side, resulting in black display. .
[0051]
When displaying the color of the colored layer 24, the voltage application unit 32 connects the transparent electrode 20A to the ground terminal 38G and grounds it, and connects the transparent electrode 20B to the negative terminal 40M of the DC power supply 34B. Thereby, a negative predetermined voltage is applied to the transparent electrode 20B, an electric field is formed in a direction parallel to the surface including the image display medium, and the positively charged black particles 26 move to the transparent electrode 20B side. That is, the black particles 26 are retracted around the transparent electrode 20A. For this reason, the area | region which opposes 20 A of transparent electrodes among the colored layers 24 is exposed, and the color of the colored layer 24 can be visually recognized from the display substrate 12 side.
[0052]
Note that if the area of the electrode on the particle moving side is reduced with respect to the area of the entire cell, the ratio of the area of the exposed back substrate is increased, and the display contrast is improved.
[0053]
In the present embodiment, the case where the wall surface 16A of the gap member 16 is the same color as the colored layer 24 has been described, but the wall surface 16A may be a mirror surface, for example. In this case, the gap member 16 is made of a metal material such as aluminum, or the wall surface of the gap member 16 made of a resin material is chrome plated. As a result, the reflected light 50 from the colored layer 24 is reflected by the wall surface 16A as the mirror surface of the gap member 16, as shown in FIG. Thus, the display color can be prevented from being different depending on the viewing angle.
[0054]
In the present embodiment, the configuration in which one type of particle is enclosed between the substrates has been described. However, a configuration in which a plurality of types of particle groups having different charging characteristics are enclosed between the substrates may be employed. For example, as shown in FIG. 10, in addition to the positively charged black particles 26, negatively charged white particles 28 may be enclosed.
[0055]
In the case of such a configuration, when white display is performed, for example, the electrodes 22A and 22B are grounded and a positive predetermined voltage is applied to the transparent electrodes 20A and 20B. As a result, the negatively charged white particles 28 move to the display substrate 12 side, and the positively charged black particles 26 move to the back substrate 14 side, resulting in white display.
[0056]
When performing black display, for example, the electrodes 22A and 22B are grounded and a predetermined negative voltage is applied to the transparent electrodes 20A and 20B. As a result, the positively charged black particles 26 move to the display substrate 12 side, and the negatively charged white particles 28 move to the back substrate 14 side, resulting in black display.
[0057]
Further, when performing display by the color of the colored layer 24, for example, a predetermined alternating voltage is applied between the transparent electrode 20A and the electrode 22A, and the transparent electrode 20B and the electrode 22B are set to the same potential. Thereby, the particles existing between the substrates between the transparent electrode 20A and the electrode 22A move between the substrates between the transparent electrode 20B and the electrode 22B, and the colored layer 24 on the electrode 22A is exposed. . For this reason, the color of the colored layer 24 can be visually recognized from the display substrate 12 side.
[0058]
In this embodiment, the case where the colored layer 24 of one color is provided on the back substrate 14 side is described. However, the present invention is not limited to this, and the colored layer 24 may be divided into a plurality of colored portions. For example, as shown in FIG. 11, the colored layer 24 is made of, for example, three colored portions 24R, 24G, and 24B of red, green, and blue, and transparent electrodes 20A, 20B, and 20C corresponding to these are provided on the display substrate 12 side. The electrode 22 is a single electrode. In such a configuration, the wall surface of the gap member 16 is the same color as the color of the colored portion that the gap member 16 contacts. For example, in FIG. 11, the left gap member 16 is in contact with the colored portion 24R, so the wall surface 16R on the side in contact with the colored portion 24R of the left gap member 16 is colored red, which is the color of the colored portion 24R. Further, in FIG. 11, the right gap member 16 is in contact with the colored portion 24B, so the wall surface 16B on the side in contact with the colored portion 24B of the right gap member 16 is colored blue, which is the color of the colored portion 24B. This can prevent the display color from appearing differently depending on the viewing angle.
[0059]
Although not shown, the gap member in the direction orthogonal to the gap member shown in FIG. 11, that is, the gap member in the direction parallel to the AA direction in FIG. 4, has a wall surface in contact with the colored portions 24R, 24G, and 24B. The colored portions 24R, 24G, and 24B, which are in contact with each other, are each painted in the same color.
[0060]
Further, in this embodiment, the cross-sectional shape of the gap member 16, that is, the cross-sectional shape in the direction of dividing the cell 18 is a rectangular shape having the same width on the display substrate side and the back substrate side. As shown, the trapezoidal shape may be such that the width on the back substrate side is smaller than the width on the display substrate side. Thereby, the display area of the colored layer 24 becomes large. Therefore, when the cross-sectional shape of the gap member 16 is rectangular, even when the color of the gap member 16 is visible when viewed from an oblique direction, as shown by the dotted arrow in FIG. The color of the layer 24 can be visually recognized. Therefore, even when viewed from the oblique direction indicated by the arrow shown in FIG. 13B, the color of the gap member 16 is not visually recognized as shown in FIG. 13A, and the display color varies depending on the viewing angle. You can prevent them from looking different.
[0061]
In this case, the gap member may be provided on the display surface side, and in particular, it can be manufactured so that the width on the front end side is narrowed by screen printing or the like.
[0062]
Further, as shown in FIG. 18B, the back substrate 14 and the gap member 16 are made of a light-transmitting member, and a color substrate 50 is arranged behind the back substrate 14, and FIG. ), The color of the color substrate 50 may be observed through the back substrate 14. In this case, the back substrate 14 is made of a material capable of transmitting almost the color of the color substrate 50, such as glass, transparent resin, translucent, light color, and milky white. The color substrate 50 is composed of a colored substrate, a light emitting substrate, or the like, and has a color different from the color of the particles. For example, when the particles are black and the color substrate is white, when the particles are arranged on the entire surface of the display substrate 12, black is displayed in a white lattice, and the particles are collected in the horizontal direction in the cell. When the back substrate side is exposed, the black display area can be reduced to achieve white display.
[0063]
When two different colored particles are used, the color is further different from these particles.
[0064]
The gap member 16 is made of a material capable of observing the color of the color substrate 50 through the back substrate 14 such as transparent resin, translucent, light color, and milky white. Accordingly, even when the observer views from the oblique direction indicated by the arrow in FIG. 19B, as shown in FIG. 19A, the light-transmitting gap member 16 and the light-transmitting light are transmitted from the wall surface of the gap member 16. It is possible to observe the color of the color substrate 50 through the back substrate 14 and to prevent the display color from being different depending on the viewing angle.
[0065]
In the case of the above configuration, the color of the color substrate 50 is observed from above the gap member 16 through the gap member 16 and the back substrate 14. For example, as shown in FIG. By arranging a light shielding layer 52 or an adhesive layer also serving as the light shielding layer 52 between the display substrate 12 and the display substrate 12, the color of the color substrate 50 is observed through the gap member 16 as shown in FIG. By not doing so, the display color by the particles can be highlighted.
[0066]
In the present embodiment, the case where an image is displayed by forming an electric field between the substrates using conductive particles or insulating particles is described. However, the present invention is not limited to this, and particles having magnetic properties are used. In addition, particles in which magnetic powder is dispersed in particles, or those in which iron particles are coated with resin may be used. In this case, a configuration may be adopted in which particles are driven by forming a magnetic field between the substrates.
[0067]
Further, for example, charged particles or magnetic particles dispersed in a transparent liquid may be used. In this case, as shown in FIG. 21A, for example, two electrodes 22A and 22B may be provided only on the back substrate 14. In this case, as shown in FIG. 21A, the electrode 22A is grounded and a predetermined negative voltage is applied to the electrode 22B, whereby an electric field is formed in a direction parallel to the surface including the display substrate 12, and the black particles 26 Can be displayed on the electrode 22B by performing black display. Further, as shown in FIG. 21B, by applying a negative predetermined voltage to the electrode 22A and grounding the electrode 22B, the black particles 26 are gathered on the electrode 22A, and the color of the colored layer 24 is displayed. be able to.
[0068]
Also in this case, the surface of the gap member 16 is made the same color as the back substrate 14, or the back substrate 14 and the gap member 16 have translucency, and the color of the color substrate 50 arranged behind the back substrate 14 is changed. It is good also as a structure to display.
[0069]
Further, as another electrode configuration, as shown in FIG. 22A, an alternating electric field is applied between the transparent electrode 20B provided on the display substrate 12 and the electrode 22B provided on the back substrate 14 by an AC power source 54. At the same time, a direct voltage is applied between the transparent electrode 20A provided on the display substrate 12 and the electrode 22A provided on the back substrate 14 so as to have a constant potential difference, whereby the transparent electrode 20B and the electrode 22B are applied. Can be moved between the transparent electrode 20A and the electrode 22A.
[0070]
Between the transparent electrode 20B and the electrode 22B to which an alternating electric field is applied, the black particles 26 reciprocate between the two electrodes, while a part of the black particles 26 moves due to the electric field formed between the transparent electrode 20A and the electrode 22A. The particles move due to the occurrence of a lateral velocity component due to the collision between the particles. The particles that have moved between the transparent electrode 20A and the electrode 22A are held on the transparent electrode 20A side by the electric field formed therebetween, and do not return between the transparent electrode 20B and the electrode 22B. Then, after the black particles 26 have sufficiently moved, the application of the alternating electric field is terminated.
[0071]
When displaying the black particles 26 on the entire surface of the cell, as shown in FIG. 22B, an alternating electric field is provided between the transparent electrode 20A and the electrode 22A and between the transparent electrode 20B and the electrode 22B. Apply. Thereby, the particles can be evenly dispersed in the cells due to collision repulsion between particles, and by applying a negative predetermined voltage to the transparent electrodes 20A and 20B at the end of the alternating electric field, the black particles 26 can be deposited on the transparent electrodes 20A, 20B. Note that the black particles 26 can be firmly attached to the substrate by increasing the application time of the voltage applied at the end of the alternating electric field.
[0072]
【The invention's effect】
As described above, according to the present invention, even when colored particles are sealed between the display substrate and the back substrate and an image is displayed using the color of the colored particles and the color on the back substrate side, It has an excellent effect that image quality deterioration due to corners can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an image display medium.
FIG. 2 is a schematic configuration diagram of an image display device.
FIG. 3 is a schematic configuration diagram of an image display device.
4A is a plan view of an image display medium, and FIG. 4B is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a schematic configuration diagram of an image display apparatus according to a modified example.
FIG. 6 is a schematic configuration diagram of an image display device according to a modification.
FIG. 7 is a plan view of a transparent electrode according to a modification.
FIG. 8 is a schematic configuration diagram of an image display device according to a modified example.
FIG. 9 is a cross-sectional view of an image display medium according to a modification.
FIG. 10 is a cross-sectional view of an image display medium according to a modification.
FIG. 11 is a cross-sectional view of an image display medium according to a modification.
FIG. 12 is a cross-sectional view of an image display medium according to a modification.
13A is a plan view of an image display medium according to a modified example, and FIG. 13B is a cross-sectional view taken along line AA of FIG.
FIG. 14 is a cross-sectional view of an image display medium according to a conventional example.
FIG. 15 is a cross-sectional view of an image display medium according to a conventional example.
16A is a plan view of an image display medium according to a conventional example, and FIG. 16B is a cross-sectional view taken along line AA of FIG.
17A is a plan view of an image display medium according to a conventional example, and FIG. 17B is a cross-sectional view taken along line AA of FIG.
FIG. 18A is a plan view of an image display medium according to a modification, and FIG. 18B is a cross-sectional view taken along line AA of FIG.
FIG. 19A is a plan view of an image display medium according to a modification, and FIG. 19B is a cross-sectional view taken along line AA of FIG.
20A is a plan view of an image display medium according to a modification, and FIG. 20B is a cross-sectional view taken along line AA of FIG.
FIGS. 21A and 21B are cross-sectional views of an image display medium according to a modification.
FIGS. 22A and 22B are cross-sectional views of an image display medium according to a modification.
[Explanation of symbols]
10 Image display media
12 Display board
14 Back substrate
16 Gap member
18 cells
20A, 20B Transparent electrode
21 Insulating layer
22A, 22B electrode
24 Colored layer
24R, 24G, 24B Colored part
26 black particles
28 white particles
30 Image display device
32 Voltage application section
34A, 34B DC power supply
36A, 36B switch

Claims (1)

A display substrate with the display-side electrode formed with a light-transmitting, wherein the display substrate and the opposite is positioned back substrate Rutotomoni rear electrode is formed, between the substrate and the rear substrate and the display substrate And is provided between the display substrate and the back substrate, and the substrate is divided into a plurality of cells. And a gap member whose surface in contact with the back substrate is smaller than the surface in contact with the display substrate, and the back side electrode is composed of an outer electrode and an inner electrode in the cell, and an image display medium ,
When displaying the color of the particle group, a voltage for moving the particle group to the display substrate side is applied to the display side electrode and the back side electrode to display the color of the back substrate. Voltage applying means for applying a voltage for moving the particle group to the outer electrode side so that the back substrate is exposed to the display side electrode and the back side electrode;
An image display device comprising:

Images