JP2006317667A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device that can be manufactured easily by using an elastic material, such as silicone rubber for an object to be moved for displaying in a space constituting a single pixel. <P>SOLUTION: A mobile electrode 10 and an elastic layer 11, made of silicon rubber or the like applied on the upper face of the electrode, are disposed as movable in a direction toward a top or a back face inside a space 9 constituting one pixel. When voltage is applied between a back face electrode plate 6 and the mobile electrode 10, the mobile electrode 10 with the elastic layer 11 moves toward the back face side by attractive force due to the Coulomb force, rendering the lower face of the mobile electrode 10 to be in contact with the upper face of an insulating film 7 on a back side (transparent) plate 2 and giving a white display state due to scattering on a rugged surface (active face) 3 of a surface side transparent plate 1. When voltage is applied between the top face electrode plate 4 and the mobile electrode 10, scattering will not be induced on the rugged face (active face) 3, resulting in a colored display state due to the color of the elastic layer 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device that performs display by moving an elastic body such as silicone rubber in a space constituting one pixel.

  In a conventional display device that performs display by moving an object in a space constituting one pixel, a colored liquid (dielectric material) and bubbles are sealed in a container constituting one pixel, and the outer surface on one side of the container is enclosed. When a voltage is applied to the pair of first electrodes provided opposite to each other, the colored liquid is moved to one side in the container by the electrostatic force, and the bubbles are moved to the other side in the container. When a voltage is applied to a pair of second electrodes provided opposite to each other on the outer surface of the liquid crystal, the colored liquid is moved to the other side in the container by electrostatic force, and the bubbles are moved to one side in the container. There is a display that is moved to the side and made to be a visible pixel only on one side of the container (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 8-254962

  However, in the above conventional display device, the side opposite to the surface side on one side of the container is white and opaque, and when there is a bubble on one side in the container, white display is given, and the colored liquid is on one side in the container In some cases, since the color display is based on the color of the colored liquid itself, the amount of the colored liquid corresponding to one pixel must always be sufficient to satisfy only one side of the container, which is difficult to manufacture. There is.

  In view of this, in the present invention, a display that can be relatively easily manufactured by using an elastic body such as silicone rubber instead of a colored liquid as an object to be moved in a space constituting one pixel. An object is to provide an apparatus.

  In order to achieve the above object, according to the present invention, in a display device, a space that constitutes one pixel surrounded by a front surface side substrate, a back surface side substrate, and a side wall provided therebetween, and moves in the front and back direction in the space. A movable electrode that can be provided, an elastic layer that is elastically deformable provided on a surface of the moving electrode that faces the surface-side substrate, and a movable electrode that moves the movable electrode in the front and back direction together with the elastic layer A moving means provided on the inner surface of the surface-side substrate, and having a working surface that scatters and reflects light when the elastic layer is not pressed and transmits light when the elastic layer is pressed. It is characterized by that.

  According to the present invention, when the elastic layer is not pressed against the working surface of the surface side substrate, white light is displayed by scattering and reflecting light on the working surface, and when the elastic layer is pressed against the working surface, Since color display other than white display is performed, it is only necessary to provide an elastic layer in the space constituting one pixel so as to be movable in the front and back direction together with the moving electrode. Compared with the case where a colored liquid is used as a moving object for display. Thus, it can be manufactured relatively easily.

(First embodiment)
FIG. 1 is a sectional view showing a white display state of one pixel portion of a display device as a first embodiment of the present invention. This display device includes a flat rectangular front surface side transparent plate (substrate) 1 and a back surface side (transparent) plate (substrate) 2 made of a colorless and transparent material such as glass or resin. On the inner surface of the front-side transparent plate 1, a fine uneven surface (working surface) 3 is formed by sandblasting or microblasting. That is, the surface side transparent plate 1 has a ground glass shape. In the case of a reflective display device that is visually recognized from the front transparent plate 1 side, the back (transparent) plate 2 is not necessarily colorless and transparent.

  A front side electrode plate 4 made of a transparent conductive material such as ITO and an insulating film (protective film) 5 made of silicon oxide or the like are provided on the outer surface of the front side transparent plate 1. On the inner surface of the back side (transparent) plate 2, a back side electrode plate 6 made of copper, aluminum or the like and an insulating film (protective film) 7 made of silicon oxide or the like are provided.

  Both the substrates 1 and 2 are disposed to face each other, and a side wall 8 is provided around the substrate. A space 9 constituting one pixel is formed by the space surrounded by the uneven surface (working surface) 3 of the front surface side transparent plate 1, the insulating film 7 on the back surface (transparent) plate 2, and the side wall 8. . A moving electrode 10 made of copper, aluminum or the like is provided in the space 9 so as to be movable in the front and back direction. An elastic layer 11 made of an elastic material such as silicone rubber is provided on the surface of the moving electrode 10 facing the transparent plate 1 on the front side. Here, the elastic layer 11 is described as being black.

  The plane size of the moving electrode 10 and the elastic layer 11 is slightly smaller than the plane size of the space 9, and a gap 12 is provided between the peripheral surface of the moving electrode 10 and the elastic layer 11 and the inner surface of the side wall 8. Yes. The gap 12 is for smooth movement of the moving electrode 10 and the elastic layer 11 in the front and back directions and for allowing movement of air enclosed in the space 9.

  As will be described later, in the state shown in FIG. 1, white display is performed, but a voltage is applied between the back-side electrode plate 6 and the moving electrode 10, and the back-side electrode plate 6 and the moving electrode 10 are present. And positive and negative charges corresponding to the applied voltage are induced, and the moving electrode 10 moves toward the back side together with the elastic layer 11 due to the attractive force due to the Coulomb force generated between the bipolar plates. Is in contact with the upper surface of the insulating film 7 on the back surface (transparent) plate 2.

  Next, the display switching operation of this display device will be described. In the state shown in FIG. 1, when the application of voltage between the back surface side electrode plate 6 and the moving electrode 10 is stopped and a voltage is applied between the front surface side electrode plate 4 and the moving electrode 10, Positive and negative charges corresponding to the applied voltage are respectively induced in the moving electrode 10, and the moving electrode 10 moves toward the surface side together with the elastic layer 11 by the attractive force due to the Coulomb force generated between the bipolar plates. As shown in FIG. 4, the surface side of the elastic layer 11 is appropriately elastically deformed and pressed against the uneven surface (working surface) 3 of the surface side transparent plate 1.

  On the contrary, in the state shown in FIG. 2, when the voltage application to the front surface side electrode plate 4 and the moving electrode 10 is stopped and a voltage is applied between the back surface side electrode plate 6 and the moving electrode 10, the back surface side electrode plate 6 and the moving electrode 10 are induced with positive and negative charges corresponding to the applied voltage, respectively, and the moving electrode 10 moves toward the back side together with the elastic layer 11 by the attractive force due to the Coulomb force generated between the bipolar plates. As shown in FIG. 1, the lower surface of the moving electrode 10 returns to a state where it abuts on the upper surface of the insulating film 7 on the back surface (transparent) plate 2.

  Next, the display state in the state shown in FIGS. 1 and 2 will be described. In the state shown in FIG. 1, external light incident from the surface side of the surface-side transparent plate 1 is the insulating film 5 and the surface-side electrode plate 4. In addition, the light passes through the surface-side transparent plate 1 and is scattered and reflected at the interface between the surface-side transparent plate 1 and air (uneven surface (working surface) 3). The scattered reflected light passes through the optical path opposite to the above and is transparent on the surface side. The light is emitted to the surface side of the plate 1 and is displayed in white.

  On the other hand, in the state shown in FIG. 2, since the surface side of the elastic layer 11 is pressed against the uneven surface (working surface) 3 of the surface side transparent plate 1, the scattering reflection at the interface between the surface side transparent plate 1 and air is The external light incident from the front surface side of the front transparent plate 1 without passing through the insulating film 5, the front electrode plate 4 and the front transparent plate 1 is absorbed by the black elastic layer 11 to produce a black display. .

  As described above, in this display device, when the elastic layer 11 is not pressed against the uneven surface (working surface) 3 of the surface-side transparent plate 1, the light is scattered and reflected by the uneven surface (working surface) 3. When white display is performed and the elastic layer 11 is pressed against the uneven surface (working surface) 3, no scattering occurs, and black display is performed. Therefore, the elastic layer 11 is placed in the space 9 constituting one pixel, and the moving electrode 10 It is only necessary to be provided so as to be movable in the front and back direction, and compared with the case of Patent Document 1 in which an appropriate amount of colored liquid must be injected into the space 9 using a colored liquid as a moving object for display. Can be manufactured relatively easily.

(Second Embodiment)
FIG. 3 is a sectional view showing a white display state of one pixel portion of a display device as a second embodiment of the present invention. In this display device, the difference from the display device shown in FIG. 1 is that the back-side electrode plate 6 and the insulating film 7 are not provided on the inner surface of the back-side (transparent) plate 2, but instead the back-side (transparent) plate. 2 and the movable electrode 10 are provided with a plurality of compression coil springs (elastic members) 13.

  In the white display state shown in FIG. 3, the voltage between the surface-side electrode plate 4 and the moving electrode 10 is 0, and the compression coil spring 13 includes the elastic layer 11 including the moving electrode 10 on the surface-side transparent plate 1. Is balanced at a position away from the uneven surface (working surface) 3 to the back surface side to some extent.

  Next, the display switching operation of this display device will be described. In the state shown in FIG. 3, when a voltage is applied between the surface side electrode plate 4 and the moving electrode 10, positive and negative charges corresponding to the applied voltage are induced in the surface side electrode plate 4 and the moving electrode 10, respectively. As a result, an attractive force due to the Coulomb force is generated between the bipolar plates. Then, the moving electrode 10 moves toward the surface side against the force of the compression coil spring 13 together with the elastic layer 11, and as shown in FIG. 4, the surface side of the elastic layer 11 is an uneven surface of the surface side transparent plate 1 ( The working surface 3 is appropriately elastically deformed and pressed. In this state, the display is black as in the case shown in FIG.

  On the other hand, in the state shown in FIG. 4, if the voltage applied between the surface-side electrode plate 4 and the moving electrode 10 is 0, the attractive force due to the Coulomb force generated between the surface-side electrode plate 4 and the moving electrode 10 is Disappear. Then, the movable electrode 10 moves toward the back surface side by the force of the compression coil spring 13 together with the elastic layer 11, and the elastic layer 11 moves from the uneven surface (working surface) 3 of the front surface side transparent plate 1 as shown in FIG. 3. Equilibrium is reached at a position some distance away from the back side. In this state, the display is white as in the case shown in FIG.

(Third embodiment)
FIG. 5 is a sectional view showing a black display state of one pixel portion of a display device as a third embodiment of the present invention. This display device differs from the display device shown in FIG. 2 in that the front-side electrode plate 4 and the insulating film 5 are not provided on the outer surface of the front-side transparent plate 1, but instead move with the insulating film 7 on the back side. This is that a plurality of compression coil springs (elastic members) 13 are provided between the electrodes 10.

  In the black display state shown in FIG. 5, the voltage between the back surface side electrode plate 6 and the moving electrode 10 is 0, and the moving electrode 10 moves toward the front surface side by the force of the compression coil spring 13 together with the elastic layer 11. By being biased, the surface side of the elastic layer 11 is appropriately elastically deformed and pressed against the uneven surface (working surface) 3 of the surface side transparent plate 1.

  Next, the display switching operation of this display device will be described. In the state shown in FIG. 5, when a voltage is applied between the back side electrode plate 6 and the moving electrode 10, positive and negative charges corresponding to the applied voltage are induced in the back side electrode plate 6 and the moving electrode 10, respectively. And, attractive force due to Coulomb force is generated between the bipolar plates. Then, the moving electrode 10 moves toward the back side against the force of the compression coil spring 13 together with the elastic layer 11, and the elastic layer 11 moves to the uneven surface (working surface) of the front side transparent plate 1 as shown in FIG. ) Equilibrium is reached at a position away from 3 to the back side to some extent. In this state, the display is white as in the case shown in FIG.

  On the other hand, in the state shown in FIG. 6, if the voltage applied between the back surface side electrode plate 6 and the moving electrode 10 is 0, the attractive force due to the Coulomb force generated between the back surface side electrode plate 6 and the moving electrode 10 is Disappear. Then, the movable electrode 10 moves toward the surface side by the force of the compression coil spring 13 together with the elastic layer 11, and as shown in FIG. 5, the surface side of the elastic layer 11 is an uneven surface (working surface) of the surface side transparent plate 1. 3 is appropriately elastically deformed and pressed. In this state, the display is black as in the case shown in FIG.

  By the way, in the black display state shown in FIG. 2, the application of the voltage to the surface side electrode plate 4 and the moving electrode 10 is stopped, and the surface side electrode plate 4 and the moving electrode 10 are electrically connected to nowhere. If appropriate, positive and negative charges induced in the surface side electrode plate 4 and the movable electrode 10 are held, respectively, and the attractive force due to the Coulomb force generated between the bipolar plates does not disappear, but the switching to the open state is not performed. The attractive force due to the Coulomb force tends to disappear due to the way and charge leakage, etc., so that the surface side of the elastic layer 11 is appropriately elastically deformed and pressed against the uneven surface (working surface) 3 of the surface side substrate 1 to maintain the pressed state. In other words, the moving electrode 10 including the elastic layer 11 moves toward the back side without permission, and the black display state is lost.

  In the black display state shown in FIG. 4, the voltage applied between the surface side electrode plate 4 and the moving electrode 10 is not set to 0, but the application of the voltage to the surface side electrode plate 4 and the moving electrode 10 is stopped. If the surface side electrode plate 4 and the moving electrode 10 can be appropriately connected to an open state where they are not electrically connected to each other, the positive and negative charges induced in the surface side electrode plate 4 and the moving electrode 10 are held respectively. Although the attractive force due to the Coulomb force generated between the plates does not disappear, the attractive force due to the Coulomb force is likely to disappear due to the way of switching to the open state or the leakage of electric charge. Due to the force of the spring 13, it moves toward the back side, resulting in a white display state shown in FIG. 3 and a phenomenon in which the black display state is broken.

Further, in the white display state shown in FIG. 6, the voltage applied between the back side electrode plate 6 and the moving electrode 10 is not set to 0, but the application of the voltage to the back side electrode plate 6 and the moving electrode 10 is stopped. If the back-side electrode plate 6 and the moving electrode 10 are appropriately connected in an open state where they are not electrically connected to any other place, the positive and negative charges induced in the back-side electrode plate 6 and the moving electrode 10 are held respectively. Although the attractive force due to the Coulomb force generated between the plates does not disappear, the attractive force due to the Coulomb force is likely to disappear due to the way of switching to the open state or the leakage of electric charge. Due to the force of the spring 13, it moves toward the surface side, resulting in a black display state as shown in FIG.
Therefore, a display device that can reliably maintain a predetermined display state even when application of a predetermined voltage is stopped will be described.

(Fourth embodiment)
FIG. 7 is a cross-sectional view showing a white display state of one pixel portion of a display device as a fourth embodiment of the present invention. This display device is different from the display device shown in FIG. 1 in that a sliding member support member 14 is provided on two opposite sides of the back surface of the moving electrode 10 and provided on the outer surface of the sliding member support member 14. A cylindrical sliding member 15 is mounted in a recess having a semicircular cross section, and moderate friction is provided between the sliding member 15 and the inner surface of the side wall 8.

  In this display device, as shown in FIG. 7, the attractive force (the frictional force between the sliding member 15 and the inner surface of the side wall 8 is generated by the Coulomb force generated between the back electrode plate 6 and the moving electrode 10. The moving electrode 10 including the elastic layer 11, the sliding member support member 14, and the sliding member 15 moves toward the back surface side, and the lower surface of the sliding member support member 14 is on the back surface side (transparent). After the contact with the upper surface of the insulating film 7 on the plate 2 and switching to white display, the sliding member 15 and the side wall 8 can be applied even if the application of voltage between the back electrode plate 6 and the moving electrode 10 is stopped. The state in which the lower surface of the sliding member support member 14 is in contact with the upper surface of the insulating film 7 on the back surface (transparent) plate 2 can be reliably maintained by the frictional force between the inner surface and the inner surface.

On the other hand, as shown in FIG. 8, the attractive force due to the Coulomb force generated between the surface-side electrode plate 4 and the moving electrode 10 (attractive force enough to overcome the frictional force between the sliding member 15 and the inner surface of the side wall 8). Accordingly, the movable electrode 10 including the elastic layer 11, the sliding member support member 14 and the sliding member 15 moves toward the surface side, and the surface side of the elastic layer 11 is the uneven surface (working surface) 3 of the surface side transparent plate 1. After the elastic display is appropriately deformed and pressed to switch to black display, the sliding member 15 and the inner surface of the side wall 8 can be applied even if the application of voltage between the surface side electrode plate 4 and the moving electrode 10 is stopped. Thus, the state in which the surface side of the elastic layer 11 is appropriately elastically deformed and pressed against the uneven surface (working surface) 3 of the surface side transparent plate 1 can be reliably maintained.
Therefore, in this display device, it is not necessary to apply power as long as the display contents are not changed, and the power consumption can be greatly reduced.

(Fifth embodiment)
FIG. 9 is a cross-sectional view showing a white display state of one pixel portion of a display device as a fifth embodiment of the present invention. This display device is different from the display device shown in FIG. 1 in that a front surface side permanent magnet 16 and a back surface side permanent magnet 17 are provided at two opposite positions on the front surface side of the side wall 8 and at two opposite positions on the rear surface side. In other words, magnetic members 18 made of iron or the like are provided on the opposing peripheral portions of the lower surface of the moving electrode 10.

  In this display device, as shown in FIG. 9, an attractive force (a magnetic force generated between the front-side permanent magnet 16 and the magnetic member 18) generated by the Coulomb force generated between the back-side electrode plate 6 and the moving electrode 10. The moving electrode 10 including the elastic layer 11 and the magnetic member 18 is moved toward the back surface side, and the lower surface of the magnetic member 18 is formed on the insulating film 7 on the back surface (transparent) plate 2. After the contact with the upper surface and switching to the white display, even if the application of voltage between the rear electrode plate 6 and the movable electrode 10 is stopped, the rear permanent magnet 17 and the magnetic member located at positions facing each other. The state in which the lower surface of the magnetic member 18 is in contact with the upper surface of the insulating film 7 on the back surface (transparent) plate 2 can be reliably maintained by the attractive force generated between the magnetic member 18 and the magnetic layer 18.

  On the other hand, as shown in FIG. 10, the attractive force due to the Coulomb force generated between the front surface side electrode plate 4 and the moving electrode 10 (the degree of overcoming the attractive force due to the magnetic force generated between the back surface side permanent magnet 17 and the magnetic member 18 is overcome. ), The movable electrode 10 including the elastic layer 11 and the magnetic member 18 moves toward the surface side, and the elastic layer 11 is appropriately elastically deformed to the uneven surface (working surface) 3 of the surface side transparent plate 1. After being pressed and switched to black display, even if the application of voltage between the surface side electrode plate 4 and the moving electrode 10 is stopped, the surface side permanent magnet 16 and the magnetic member 18 located at positions facing each other The state in which the surface side of the elastic layer 11 is appropriately elastically deformed and pressed against the uneven surface (working surface) 3 of the surface-side transparent plate 1 can be reliably maintained by the attractive force due to the magnetic force generated during the time.

Therefore, even in this display device, it is not necessary to apply power as long as the display contents are not changed, and the power consumption can be greatly reduced. In addition, a front surface side magnetic member and a back surface side magnetic member made of iron or the like are provided at two opposite positions on the front surface side of the side wall 8 and two opposite positions on the rear surface side, and opposite peripheral portions on the lower surface of the moving electrode A permanent magnet may be provided.
Moreover, although the said embodiment demonstrated the structure which uses a permanent magnet, as long as a magnetic force is generated, things, such as an electromagnet, may be sufficient.

(Sixth embodiment)
FIG. 11 is a cross-sectional view showing a white display state of one pixel portion of a display device as a sixth embodiment of the present invention. This display device is different from the display device shown in FIG. 1 in that the surface-side hydrophilic film 19 and the back-side hydrophilic film 20 are provided at two opposite positions on the front surface side of the inner surface of the side wall 8 and at two opposite positions on the rear surface side. The front surface side water film 21 and the back surface side water film 22 are attached to the respective surfaces of the front surface side hydrophilic film 19 and the back surface side hydrophilic film 20, and the peripheral surface of the moving body support plate 23 provided on the lower surface of the moving electrode 10 The movable body hydrophilic film 24 is provided at two opposite positions. In this case, the surface other than the portion provided with the front surface side hydrophilic film 19 and the rear surface side hydrophilic film 20 on the inner surface of the side wall 8 is a hydrophobic surface.

  In this display device, as shown in FIG. 11, the attractive force due to the Coulomb force generated between the back surface side electrode plate 6 and the moving electrode 10 (intervened between the front surface side hydrophilic film 19 and the moving body hydrophilic film 24). The moving electrode 10 including the elastic layer 11, the moving body support plate 23, and the moving body hydrophilic film 24 moves toward the back surface side by an attractive force that overcomes the cohesive force of the surface-side water film 21 thus formed, and supports the moving body. After the lower surface of the plate 23 comes into contact with the upper surface of the insulating film 7 on the back side (transparent) plate 2 and switches to white display, the application of voltage between the back side electrode plate 6 and the movable electrode 10 is stopped. However, the cohesive force of the back-side water film 22 interposed between the back-side hydrophilic film 20 and the moving body hydrophilic film 24 positioned so as to face each other (the cohesive force of water is generally small, but nanometer , Relatively large in the micrometer world) A state in which the lower surface of the body support plate 23 is in contact with the back surface side (transparent) top surface of the insulating film 7 on the plate 2 can be reliably maintained.

On the other hand, as shown in FIG. 12, the attractive force due to the Coulomb force generated between the front surface side electrode plate 4 and the moving electrode 10 (the back side water intervening between the back side hydrophilic film 20 and the moving body hydrophilic film 24). The moving electrode 10 including the elastic layer 11, the movable body support plate 23, and the movable body hydrophilic film 24 moves toward the surface side by an attractive force that overcomes the cohesive force of the film 22, and the surface side of the elastic layer 11 is the surface side. Even if the application of voltage between the front-side electrode plate 4 and the moving electrode 10 is stopped after being appropriately elastically deformed and pressed against the uneven surface (working surface) 3 of the transparent plate 1 and switching to black display, Because of the cohesive force of the surface-side water film 21 interposed between the surface-side hydrophilic film 19 and the movable body hydrophilic film 24 positioned so as to oppose each other, the surface side of the elastic layer 11 is an uneven surface of the surface-side transparent plate 1. (Working surface) 3 was appropriately elastically deformed and pressed It is possible to reliably maintain the state.
Therefore, even in this display device, it is not necessary to apply power as long as the display contents are not changed, and the power consumption can be greatly reduced.

  In the sixth embodiment, the surface-side hydrophilic film 19 and the back-side hydrophilic film 20 are provided at two opposite positions on the surface side of the inner surface of the side wall 8 and at two opposite positions on the rear surface side, and the surface of the inner surface of the side wall 8 is provided. Except for the portions where the side hydrophilic film 19 and the back surface side hydrophilic film 20 are provided, the surface is a hydrophobic surface, and the moving body hydrophilic film 24 is provided at two opposite positions on the peripheral surface of the moving body support plate 23 provided on the lower surface of the moving electrode 10. And the surface side water film 21 and the back surface side water film 22 are attached to the respective surfaces of the front surface side hydrophilic film 19 and the back surface side hydrophilic film 20. 20 is provided with a front-side lipophilic film and a back-side lipophilic film, respectively, except for a portion of the inner surface of the side wall 8 where the front-side lipophilic film and the back-side lipophilic film are provided. Instead of the side water film 22, the surface side oil film It may be configured to attach the fine backside oil film.

(Other embodiments)
When switching from the white display state shown in FIGS. 1, 7, 9 and 11 to the black display state shown in FIGS. 2, 8, 10 and 12, a voltage is applied between the surface side electrode plate 4 and the movable electrode 10. When applied, an attractive force due to a Coulomb force is generated between the front surface side electrode plate 4 and the moving electrode 10, and a charge having the same sign as the charge induced by the voltage applied to the moving electrode 10 is induced to the back side electrode plate 6. As described above, a voltage having the same polarity as that between the front surface side electrode plate 4 and the movable electrode 10 is applied between the front surface side electrode plate 4 and the rear surface side electrode plate 6, and the Coulomb is applied between the rear surface side electrode plate 6 and the movable electrode 10. You may make it generate the repulsion by force.

  Further, when switching from the black display state shown in FIGS. 2, 8, 10 and 12 to the white display state shown in FIGS. 1, 7, 9 and 11, a gap is formed between the back electrode plate 6 and the movable electrode 10. A voltage is applied to generate an attractive force due to the Coulomb force between the back-side electrode plate 6 and the moving electrode 10, and a charge having the same sign as the charge induced by the voltage applied to the moving electrode 10 is induced to the front-side electrode plate 4. As described above, a voltage having the same polarity as that between the back surface side electrode plate 6 and the moving electrode 10 is applied between the back surface side electrode plate 6 and the front surface side electrode plate 4. A repulsive force due to the Coulomb force may be generated.

  Further, in the display device shown in FIGS. 1, 2, and 7 to 12, the back-side electrode plate 6 (and the insulating film 7) is omitted, and charges of the same sign are induced in the front-side electrode plate 4 and the moving electrode 10. As described above, a voltage having the same polarity is applied to the surface side electrode plate 4 and the moving electrode 10 with respect to a reference potential (for example, GND), and the Coulomb is applied between the surface side electrode plate 4 and the moving electrode 10. When a repulsive force is generated, a white display state is obtained as shown in FIGS. 1, 7, 9, and 11, while a voltage is applied between the surface-side electrode plate 4 and the moving electrode 10, and the surface-side electrode plate When an attractive force due to the Coulomb force is generated between the moving electrode 10 and the moving electrode 10, a black display state as shown in FIGS. 2, 8, 10, and 12 may be obtained.

  Further, in the display device shown in FIGS. 1, 2, and 7 to 12, the front side electrode plate 4 (and the insulating film 5) is omitted, and a voltage is applied between the back side electrode plate 6 and the moving electrode 10, When an attractive force due to the Coulomb force is generated between the back surface side electrode plate 6 and the moving electrode 10, a white display state as shown in FIGS. 1, 7, 9, and 11 is obtained. A voltage having the same polarity is applied to the back-side electrode plate 6 and the moving electrode 10 with respect to a reference potential (for example, GND) so that charges of the same sign are induced in the moving electrode 10, and the back-side electrode plate When a repulsive force due to Coulomb force is generated between the movable electrode 10 and the moving electrode 10, a black display state as shown in FIGS. 2, 8, 10, and 12 may be obtained.

  Further, in the display device shown in FIGS. 3 and 4, the back side electrode plate 6 and the insulating film 7 are provided on the inner surface of the back side (transparent) substrate 2, and the white display state shown in FIG. 3 to the black display state shown in FIG. 4. When switching to, a voltage is applied between the surface-side electrode plate 4 and the moving electrode 10 to generate an attractive force due to the Coulomb force between the surface-side electrode plate 4 and the moving electrode 10 and is induced by the voltage applied to the moving electrode 10. The voltage having the same polarity as that between the front surface side electrode plate 4 and the movable electrode 10 is also applied between the front surface side electrode plate 4 and the rear surface side electrode plate 6 so that a charge having the same sign as that of the back surface side electrode plate 6 is induced. The repulsive force may be generated between the back side electrode plate 6 and the moving electrode 10 by the Coulomb force.

  3 and 4, the front surface side electrode plate 4 (and the insulating film 5) is omitted, and the rear surface side electrode plate 6 is provided on the inner surface of the rear surface side (transparent) substrate 2, and the rear surface side electrode plate. 6 and the moving electrode 10 are applied with voltages of the same polarity on the back side electrode plate 6 and the moving electrode 10 with respect to a reference potential (for example, GND) so that charges having the same sign are induced on the back side. When a repulsive force due to a Coulomb force is generated between the electrode plate 6 and the moving electrode 10, a black display state as shown in FIG. 4 may be obtained.

  Further, in the display device shown in FIGS. 5 and 6, the surface side electrode plate 4 (and the insulating film 5) is provided on the outer surface of the surface side transparent substrate 1, and the white display state shown in FIG. 6 from the black display state shown in FIG. When switching to, a voltage is applied between the back-side electrode plate 6 and the moving electrode 10 to generate an attractive force due to the Coulomb force between the back-side electrode plate 6 and the moving electrode 10 and is induced by the voltage applied to the moving electrode 10. A voltage having the same polarity as that between the back-side electrode plate 6 and the moving electrode 10 is applied to the back-side electrode plate 6 and the front-side electrode plate 4 so that a charge having the same sign as that of the charge is induced in the front-side electrode plate 4. Then, a repulsive force due to the Coulomb force may be generated between the surface-side electrode plate 4 and the moving electrode 10.

  5 and 6, the back side electrode plate 6 (and the insulating film 7) is omitted, and the front side electrode plate 4 (and the insulating film 5) is provided on the outer surface of the front side transparent substrate 1. A voltage having the same polarity is applied to the surface side electrode plate 4 and the moving electrode 10 with respect to a reference potential (for example, GND) so that charges of the same sign are induced in the surface side electrode plate 4 and the moving electrode 10. When a repulsive force due to the Coulomb force is generated between the surface side electrode plate 4 and the moving electrode 10, a white display state as shown in FIG. 6 may be obtained.

  In the fourth to sixth embodiments, the application of voltage to all the electrode plates 4, 6, and 10 is stopped (open) in the display maintenance state. However, all the electrode plates 4, 6 and 10 may be set to the same potential, for example, 0 V (GND) so that no Coulomb force is generated. In this case as well, power is not consumed as in the case of stopping (opening).

  Further, in each of the above embodiments, the elastic layer 11 is described as being black. However, the present invention is not limited thereto, and other colors such as blue and red may be used. For example, in the case of silicone rubber, the color can be changed by a pigment to be blended at the time of molding. Or you may color and use the elastic body which is not colored in itself.

  The elastic layer 11 may be colorless and transparent, and a colored layer such as black, blue, or red may be provided between the elastic layer 11 and the moving electrode 10. In this case, when the elastic layer 11 is not pressed against the uneven surface (working surface) 3 of the front surface side transparent plate 1, white display is obtained by scattering reflection, and the uneven surface (working surface) 3 of the front surface side transparent plate 1 is elastic. When the layer 11 is pressed, scattering reflection does not occur, and a colored display according to the color of the colored layer provided between the elastic layer 11 and the moving electrode 10 is obtained.

  Further, in each of the embodiments described above, the moving electrode and the elastic layer have been described as separate bodies. However, the moving electrode is, for example, a net-like one that is integrated with the elastic layer, or the conductive fine particles are elastic. It may be a functional elastic body that is included in the layer and to which a voltage can be applied.

Sectional drawing which shows the white display state of 1 pixel part of the display apparatus as 1st Embodiment of this invention. Sectional drawing which shows the black display state of the display apparatus shown in FIG. Sectional drawing which shows the white display state of 1 pixel part of the display apparatus as 2nd Embodiment of this invention. Sectional drawing which shows the black display state of the display apparatus shown in FIG. Sectional drawing which shows the black display state of 1 pixel part of the display apparatus as 3rd Embodiment of this invention. Sectional drawing which shows the white display state of the display apparatus shown in FIG. Sectional drawing which shows the white display state of 1 pixel part of the display apparatus as 4th Embodiment of this invention. Sectional drawing which shows the black display state of the display apparatus shown in FIG. Sectional drawing which shows the white display state of 1 pixel part of the display apparatus as 5th Embodiment of this invention. Sectional drawing which shows the black display state of the display apparatus shown in FIG. Sectional drawing which shows the white display state of 1 pixel part of the display apparatus as 6th Embodiment of this invention. Sectional drawing which shows the black display state of the display apparatus shown in FIG.

Explanation of symbols

1 Surface side transparent plate (substrate)
2 Back side (transparent) plate (substrate)
3 Uneven surface (working surface)
4 Surface side electrode plate 5 Insulating film (protective film)
6 Back side electrode plate 7 Insulating film (protective film)
8 Side wall 9 Space 10 Moving electrode 11 Elastic layer 12 Gap 13 Compression coil spring (elastic member)
DESCRIPTION OF SYMBOLS 14 Sliding member support member 15 Sliding member 16 Front surface side permanent magnet 17 Back surface side permanent magnet 18 Magnetic member 19 Front surface side hydrophilic film 20 Back surface side hydrophilic film 21 Front surface side water film 22 Back surface side water film 23 Moving body support plate 24 Movement Body hydrophilic membrane

Claims (9)

A space constituting one pixel surrounded by a front surface side substrate, a back surface side substrate, and a side wall provided therebetween;
A moving electrode provided in the space so as to be movable in the front-back direction;
An elastically deformable elastic layer provided on a surface of the moving electrode facing the surface-side substrate;
Moving electrode moving means for moving the moving electrode together with the elastic layer in the front and back direction;
Provided on the inner surface of the surface-side substrate, when the elastic layer is not pressed, it scatters and reflects light, and when the elastic layer is pressed, a working surface that transmits light;
A display device comprising:   The display device according to claim 1, wherein the elastic layer includes silicone rubber.   The display device according to claim 1, wherein the elastic layer is colored, or the elastic layer is transparent, and a colored layer is provided between the elastic layer and the moving electrode. Display device. The display device according to claim 1, wherein the moving electrode moving unit includes:
The moving electrode;
At least one of a front surface side electrode provided on the front surface side substrate and a back surface side electrode provided on the back surface side substrate; and
A display device comprising voltage applying means for applying a voltage to the display. The display device according to claim 1, wherein the moving electrode moving unit includes:
An elastic member that holds the elastic layer at a position away from the working surface of the surface-side substrate in an equilibrium state, or holds the elastic layer at a position that presses the elastic layer against the working surface of the surface-side substrate in an equilibrium state. A display device characterized by that. The display device according to claim 1,
This state is maintained when the elastic layer is positioned away from the working surface of the surface-side substrate, or when the elastic layer is positioned so as to be pressed against the working surface of the surface-side substrate. An elastic layer position maintaining means for maintaining   The display device according to claim 6, wherein the elastic layer position maintaining unit includes a sliding member between a peripheral surface side of a support member that supports the elastic layer and the moving electrode and an inner surface of the side wall. Characteristic display device. The display device according to claim 6, wherein the elastic layer position maintaining means is
A front surface side magnet and a back surface side magnet provided on the front surface side and the back surface side of the side wall, and a magnetic member provided on a peripheral surface side of a support member that supports the elastic layer and the moving electrode, or
A front surface side magnetic member and a back surface side magnetic member provided on the front surface side and the back surface side of the side wall, and a magnet provided on the peripheral surface side of the support member that supports the elastic layer and the moving electrode,
A display device characterized by that. The display device according to claim 6, wherein the elastic layer position maintaining means is
A surface-side hydrophilic film and a back-side hydrophilic film provided on the front surface side and the back surface side of the inner surface of the side wall; and a moving body hydrophilic film provided on the peripheral surface side of the support member that supports the elastic layer and the moving electrode. A surface-side water film and a back-side water film provided on each surface of the surface-side hydrophilic film and the back-side hydrophilic film, or
A surface-side lipophilic film and a back-side lipophilic film provided on the front surface side and the back surface side of the inner surface of the side wall; and a moving body lipophilic film provided on the peripheral surface side of the support member that supports the elastic layer and the moving electrode; The surface side oil film and the back side oil film provided on each surface of the surface side lipophilic film and the back side lipophilic film,
A display device characterized by that.

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