JP2005115052A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display with higher contrast in a display device utilizing the osmosis phenomenon of an electroosmosis liquid. <P>SOLUTION: In relation to a transparent porous layer 10 which is composed of a transparent material and of which the inner pores can be filled with a black colored electroosmosis liquid L1 by permeation, a potential difference is applied between a front electrode 31a and a back electrode 31b by a potential difference applying part 35 so as to apply electric force to the electroosmosis liquid L1 and to move the electroosmosis liquid L1 in the thickness direction of the transparent porous layer 10. When the electroosmosis liquid L1 is concentrated on the display surface side 10a of the transparent porous layer 10, the black color which is the color of the electroosmosis liquid L1 is displayed on the display surface of a device 101, and when the electroosmosis liquid L1 is concentrated on the non-display surface side 10b of the transparent porous layer 10, a white color due to scattering of illumination light La on the display surface side 10a of the transparent porous layer 10 is displayed on the display surface of the device 101. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device, and more particularly, to a display device using a permeation phenomenon of an electroosmotic liquid.

Conventionally, a display that performs display by changing the state in which the light incident on the porous body is reflected, refracted, or scattered by utilizing the electroosmotic phenomenon in which the electroosmotic liquid permeates the porous body to which a potential difference is applied. The device is known. As such a display device, for example, as shown in FIGS. 7A and 7B, a large number of concave portions 81 are formed on the surface side to be a display surface, and the electroosmotic liquid can penetrate into the internal holes and is transparent. There is known a display device in which a front electrode 83a that also serves as a light shielding plate is provided on the front side of a porous plate 82, and a back electrode 83b that is formed of a transparent electrode is provided on the back side (see Patent Document 1). In this display device, an electric potential is applied between the electrodes to form an electric field in the thickness direction of the porous plate 82, so that the electroosmotic liquid L5 permeates the surface electrode 83a side and is surrounded by the recesses 81. Each concave space 84 is filled with the electroosmotic liquid L5 (see FIG. 7A), or the electroosmotic liquid L5 is permeated into the back electrode 83b to discharge the electroosmotic liquid L5 from the concave space 84. Thus, the display is performed by changing the reflection, refraction, or scattering state of the light Le entering the concave space 84 from the front electrode 83a side or the back electrode 83b side (see FIG. 7B).
JP 55-70820 A

  However, in the display device, since the electroosmosis phenomenon does not occur in the concave space 84 where the porous body of the porous plate 82 does not exist, the electroosmotic liquid L5 is not sufficiently filled in the concave space 84, or There may be a case where the discharge of the electroosmotic liquid L5 from the concave space 84 becomes insufficient, and the reflection, refraction, or scattering state of the light Le incident on the concave space 84 is reduced. In addition, since the light incident on the region where the concave portion 81 where the surface electrode 83a that also serves as the light shielding plate is disposed is not used for display, the above-described device has sufficient contrast. There is a problem that it is difficult to display.

  In addition, a color filter, a black plate, or the like is disposed on the back electrode 83b side of the porous plate 82, and the electroosmotic liquid L5 is permeated into the surface electrode 83a side of the porous plate 82 so that the electroosmotic solution is introduced into each concave space 84. By satisfying L5, a color such as a color filter or a black plate is displayed on the display surface through the porous plate 82, and the electroosmotic liquid L5 is permeated into the back electrode 83b side of the porous plate 82 from each concave space 84. When the white color is displayed by scattering the light Le on the surface side of the porous plate 82 serving as a display surface by discharging the electroosmotic liquid L5, a color filter, a black plate, or the like is displayed. There is a problem in that the visibility is poor because parallax occurs between the white and white display states.

  Further, in the above-described apparatus, sufficient performance cannot be exhibited unless the refractive index of the electroosmotic liquid L5 and the refractive index of the porous plate 82 are substantially equal. There is a problem that the selectivity with respect to is narrow.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a display device that solves the above-described problems.

  The display device according to the present invention comprises a colored electroosmotic liquid, a material having a color different from that of the electroosmotic liquid, a porous layer in which the electroosmotic liquid can permeate the internal pores, and an electric force acting on the electroosmotic liquid. And an osmotic fluid moving means for moving the electroosmotic liquid in the porous layer in the thickness direction of the porous layer or in a plane direction perpendicular to the thickness direction. The porous layer is displayed in the color based on the electroosmotic liquid in the concentrated part, and the porous layer is displayed in the color based on the porous layer in the part where the electroosmotic liquid on the display surface side of the porous layer is not concentrated. It is characterized by that.

  In the above, the “colored electroosmotic liquid” means a liquid other than colorless and transparent, and is not limited to having a hue, but may have a hue having no hue such as black or gray. Moreover, it may be transparent or opaque. The electroosmotic liquid is not limited to a colored one, and the material itself constituting the electroosmotic liquid may have the above color.

  Further, “a porous layer made of a material having a color different from that of the electroosmotic liquid and allowing the electroosmotic liquid to permeate the internal pores” includes those that are colorless and transparent. The porous layer is not limited to a colored layer, and the material constituting the porous layer itself may have the above color.

  Further, the “color based on the electroosmotic solution” may mainly indicate the color of the electroosmotic solution and may be in a state affected by the color of the porous layer.

  In addition, the “color based on the porous layer” only needs to display the color of the porous layer or the white color caused by light scattering on the display surface side of the porous layer, and is influenced by the color of the electroosmotic liquid. It may be in the state.

  In the display device according to the present invention, the pore diameter of the pores of the porous layer is preferably 0.1 μm or more and 10 μm or less. The pore diameter of 0.1 μm or more and 10 μm or less is not necessarily limited to the case where the pore diameter of all the pores in the porous layer is 0.1 μm or more and 10 μm or less. 90% or more of the holes may have a diameter of 0.1 μm or more and 10 μm or less.

  Moreover, it is preferable that the thickness of a porous layer is 10 micrometers or more and 200 micrometers or less.

  The porous layer is made of an organic material such as nitrocellulose, acetylcellulose, cellulose acetate, vinyl chloride, polypropylene, polyamide, polytetrafluoroethylene, polyolefin, polysulfone, or an inorganic material such as glass or alumina. Alternatively, it may be a mixture of any two or more of cellulosic materials, resin materials, porcelain materials, and glass materials.

  The porous layer is configured so that the electroosmotic liquid cannot move between different positions in the surface direction of the porous layer, and different colors of the electroosmotic liquid are permeated into the different positions. In this case, the different colors are preferably a combination of yellow, magenta, cyan, and black, or a combination of red, green, and blue. In order to prevent the electroosmotic liquid from moving between different positions, partition walls may be provided between different positions of the porous layer, or the porous layer may be physically separated.

  Further, the permeate moving means may be composed of electrodes arranged on both the front and back surfaces of the porous layer and a potential difference applying section for applying a potential difference between the electrodes disposed on the front and back surfaces. Here, “both front and back surfaces” refer to the display surface of the porous layer and the surface opposite to the display surface.

  Further, the permeation liquid moving means may be capable of applying different electric forces in the thickness direction to the electroosmotic liquids present at different positions in the surface direction of the porous layer.

  According to the display device of the present invention, a colored electroosmotic liquid, a porous layer made of a material having a color different from that of the electroosmotic liquid, the electroosmotic liquid being able to permeate the internal holes, and an electric force applied to the electroosmotic liquid. An osmotic solution moving means for moving the electroosmotic solution in the porous layer in the thickness direction of the porous layer or in a plane direction orthogonal to the thickness direction in the porous layer, the electroosmosis on the display surface side of the porous layer In areas where the liquid is concentrated, the porous layer is displayed in a color based on the electroosmotic liquid, and in areas where the electroosmotic liquid on the display surface side of the porous layer is not concentrated, the porous layer is displayed in a color based on the porous layer. The entire area of the porous layer can be colored based on the electroosmotic liquid, or the color based on the porous layer, and the reflection of light incident on the porous layer as a whole, Since the state of refraction or scattering can be changed greatly, It is possible to increase the contrast of the display compared to come.

  In addition, since an image without parallax can be displayed by causing the color change to occur on the display surface side of the porous layer, an image with good visibility can be displayed.

  Furthermore, since it is not necessary to match the refractive index of the electroosmotic liquid and the refractive index of the porous layer, the selectivity with respect to the electroosmotic liquid and the porous layer can be expanded.

  In the display device according to the present invention, when the pore diameter of the porous layer is 0.1 μm or less, the capillary force of the porous layer becomes too strong, and a large voltage is required to move the electroosmotic liquid. Also, if the pore diameter of the porous layer is 10 μm or more, light scattering is weakened when displaying on the display surface of the porous layer using light scattering, so that it cannot be displayed effectively. Therefore, by setting the pore diameter of the porous layer to 0.1 μm or more and 10 μm or less, the characteristics of the porous layer can be improved.

  On the other hand, if the thickness of the porous layer is 10 μm or less, light is transmitted through the porous layer, and display changes due to movement of the electroosmotic liquid cannot be effectively displayed. Further, when the thickness of the porous layer is 200 μm or more, a large voltage is required for the movement of the electroosmotic liquid, and the movement of the electroosmotic liquid takes time, so that the display response is lowered. Therefore, the characteristic of a porous layer can be made favorable by the thickness of a porous layer being 10 micrometers or more and 200 micrometers or less.

  The porous layer is made of an organic material such as nitrocellulose, acetylcellulose, cellulose acetate, vinyl chloride, polypropylene, polyamide, polytetrafluoroethylene, polyolefin, polysulfone, or an inorganic material such as glass or alumina. Alternatively, the porous layer can be more easily formed by using a mixture of any two or more of cellulosic materials, resin materials, porcelain materials, and glass materials.

  Further, the porous layer is configured so that the electroosmotic liquid cannot move between different positions in the plane direction of the porous layer, and different colors of the electroosmotic liquid are permeated into the different positions. Thus, multicolor display can be performed. At this time, full-color display can be performed by setting the different colors to a combination of yellow, magenta, cyan, and black, or a combination of red, green, and blue.

  In addition, the permeate transfer means includes an electrode disposed on each of the front and back surfaces of the porous layer and a potential difference applying unit that provides a potential difference between the electrodes disposed on both the front and back surfaces. Electric force can be applied to the penetrating liquid.

  Further, by making the permeate moving means be capable of applying different electric forces in the thickness direction to the electroosmotic liquids present at different positions in the plane direction of the porous layer. A one-dimensional or two-dimensional image can be displayed on the display surface.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a display device according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a configuration for applying an electric force to the electroosmotic liquid, and FIG. 3 is an upper electroosmotic liquid. FIG. 3A is a perspective view illustrating a schematic configuration for applying the electric force, and FIG. 3B is a diagram illustrating the configuration for applying the electric force. 3 is a perspective view showing a more detailed structure, FIG. 3C is a diagram showing a circuit configuration for applying the electric force, and FIG. 4 is a perspective view showing a state where display is performed by the display device. (A) is a figure which shows the state which displays an initial state or gray, FIG.4 (b) is a figure which shows the state etc. which display black, FIG.4 (c) is a figure which shows the state etc. which display white.

  The display device 101 according to the first embodiment of the present invention includes an electroosmotic liquid L1 colored in black, a transparent porous layer 10 made of a transparent material and capable of penetrating the electroosmotic liquid L1 into the internal pores, An osmotic fluid moving means 30 for applying an electric force to the electroosmotic liquid L1 to move the electroosmotic liquid L1 in the transparent porous layer 10 in the thickness direction (arrow Z direction in the figure) in the transparent porous layer 10; I have.

  The display device 101 is displayed by receiving illumination light La on the display surface side. When the electroosmotic liquid L1 is concentrated on the display surface side 10a of the transparent porous layer 10, the display device 101 When the display surface 101 displays black, which is the color of the electroosmotic liquid L1, and the electroosmotic liquid L1 is concentrated on the non-display surface side 10b of the transparent porous layer 10, the transparent porous layer 10 is displayed on the display surface of the apparatus 101. The white color resulting from scattering of the illumination light La on the display surface 10a side of the quality layer 10 is displayed.

  The permeate transfer means 30 includes a front electrode 31a and a back electrode 31b disposed on both the front and back surfaces of the transparent porous layer 10, and a potential difference applying unit 35 that provides a potential difference between the front electrode 31a and the back electrode 31b. Thus, an electric field is formed in the thickness direction (arrow Z direction in the figure) of the transparent porous layer 10 to apply an electric force to the electroosmotic liquid L1. The front electrode 31 a is disposed on the display surface 10 a side of the transparent porous layer 10, and the back electrode 31 b is disposed on the non-display surface 10 b side of the transparent porous layer 10.

  A plurality of linearly extending front electrodes 31 a disposed on the display surface 10 a side of the transparent porous layer 10 and a plurality of linearly extending back electrodes 31 b disposed on the non-display surface 10 b side of the transparent porous layer 10. Are arranged in a lattice so that the linearly extending directions are orthogonal to each other with the transparent porous layer 10 interposed therebetween, and the front electrode 31a and the back electrode 31b are plate-like front electrode portions 30a and back electrodes. It arrange | positions at each of the part 30b, and is arrange | positioned on the transparent porous layer 10 (refer FIG. 2).

As each of the electrodes, for example, an electrode made of a transparent material such as In ₂ O ₃ —SnO ₂ (ITO) or ZnO can be employed. The back electrode 31b can be an electrode made of an opaque material such as Ni, Al, Pt, Ag, or graphite. The electrode may be formed to a thickness of about 200 nm by, for example, a thin film forming method, more specifically, sputtering or the like.

  The osmotic fluid moving means 30 have different sizes in the thickness direction (arrow Z direction in the figure) with respect to the electroosmotic liquid L1 existing at different positions in the region extending in the plane direction (arrow XY plane direction in the figure). An electric force can be applied, and the permeate moving means 30 exists in different positions via the front electrode 31a and the back electrode 31b arranged in a lattice pattern with respect to the transparent porous layer 10. A passive drive method is employed in which different electric forces are applied to the electroosmotic liquid L1. The positions different from each other in the plane orthogonal to the thickness direction are positions where the front electrode 31a and the back electrode 31b intersect each other in a lattice shape. For example, the positions (1, 1) and ( 2, 1), position (3, 1), position (1, 2), position (2, 2), position (3, 2), and the like.

  Note that a method different from the driving method can be adopted for the permeation liquid moving means. For example, as shown in FIGS. 3A to 3C, one surface side of the transparent porous layer 10 ( For example, an electrode portion 33 having a large number of electrodes 35 each arranged in a matrix and connected to a thin film transistor 34 (TFT transistor) is disposed on the display surface 10a side, and the other surface side of the transparent porous layer 10 is disposed. It is also possible to adopt an active driving method in which different electric forces are applied to the electroosmotic liquids L1 existing at different positions through the electrodes 35 by driving the thin film transistors 34.

  By adopting the penetrant moving means as described above, white or black can be displayed at an arbitrary position on the display surface of the display device, and for example, still images and moving images such as characters and figures can be displayed by this device. can do.

  The electroosmotic liquid L1 is a mixture of an electroosmotic liquid and ink. As the electroosmotic liquid, for example, dimethyltriphenyltrimethoxysiloxane having a refractive index of 1.51 can be used. (See JP-A-60-6928 and JP-A-5-246021). In the present embodiment, the electroosmotic liquid L1 is a mixture of dimethyltriphenyltrimethoxysiloxane and black ink. The color of the ink is not limited to black and may be any number.

  It is preferable to use a microporous membrane filter made of a transparent resin material for the transparent porous layer 10. As the transparent resin material, vinyl chloride, polypropylene, polyamide, polytetrafluoroethylene, polyolefin, polysulfone, or the like is adopted. be able to. In addition, for example, cellulose materials such as nitrocellulose, acetylcellulose, and cellulose acetate can be employed, porcelain materials such as alumina, glass, and the like can be employed. Furthermore, the above resin materials, cellulose materials, and glass materials can be employed. It is also possible to employ a mixture made of a combination of any two or more of porcelain materials. In the present embodiment, the microporous acetylcellulose is used for the transparent porous layer 10. The refractive index is not necessarily matched with the refractive index of the electroosmotic liquid. Moreover, in this Embodiment, although the transparent porous layer 10 is colorless and transparent, it does not necessarily need to be transparent.

  In the transparent porous layer 10, when no potential difference is given between the front electrode 31 a and the back electrode 31 b, the electroosmotic liquid L 1 is caused by the capillary force of the plurality of holes formed in the transparent porous layer 10. It penetrates and stabilizes in the entire transparent porous layer 10. This capillary force can be expressed by the following equation.

P = (2σ cos θ) / r
here,
P: Capillary force (Pa)
σ: Surface tension (N / m)
θ: Contact angle between the liquid and the inner wall of the capillary (degrees)
r: radius of the capillary (m0)
The pore diameter of the transparent porous layer 10 and the pore diameter of the colored porous layer 20 are preferably 0.1 μm or more and 10 μm or less, and more preferably 0.1 μm or more and 5 μm or less. preferable. This is because if the pore diameter of the transparent porous layer 10 is 0.1 μm or less, the capillary force of the transparent porous layer 10 becomes too strong, and a large voltage is required to move the electroosmotic liquid L1. In addition, when the pore diameter of the pores of the transparent porous layer 10 is 10 μm or more, light scattering is weakened when displaying on the display surface 10a of the transparent porous layer 10 using light scattering, so that the display is effective. Can not do it.

  Moreover, it is preferable that the thickness of the transparent porous layer 10 shall be 10 micrometers or more and 200 micrometers or less. This is because if the thickness of the transparent porous layer 10 is 10 μm or less, the illumination light La is transmitted through the transparent porous layer 10 and the display change due to the movement of the electroosmotic liquid L1 cannot be effectively displayed. . Further, when the thickness of the transparent porous layer 10 is 200 μm or more, a large voltage is required for the movement of the electroosmotic liquid L1, and the movement of the electroosmotic liquid L1 takes time, so that the display response decreases. Because.

  Next, the operation of the display device according to the first embodiment will be described.

  When the potential difference imparting portion 35 is in an initial state where no potential difference is imparted to the transparent porous layer 10, the electroosmotic liquid L1 is dispersed throughout the transparent porous layer 10 by capillary force, as shown in FIG. The transparent porous layer 10 is translucent due to the influence of the electroosmotic liquid L1 colored black. In this state, when the illumination light La is illuminated on the display surface 10a side of the transparent porous layer 10, gray is displayed.

  Next, when displaying black, as shown in FIG.4 (b), the electric potential difference provision part 35 provides the electric potential difference between the surface electrode 31a and the back electrode 31b so that the surface electrode 31a side may become-. For example, an electric field is formed in the thickness direction in the transparent porous layer 10 corresponding to the position (1, 1) and the position (3, 1) in FIG. The electroosmotic liquid L1 is concentrated and moved to the display surface 10a side of the transparent porous layer 10 by the action of an electric force on the electroosmotic liquid L1 in the layer 10. Thereby, in the position (1, 1) and the position (3, 1), black which is a color colored with respect to the electroosmotic liquid L1 is displayed. On the other hand, a position where no potential difference is applied between the front electrode 31a and the back electrode 31b, for example, position (2, 1), position (1, 2), position (2, 2) in FIG. In the position (3, 2), since the electroosmotic liquid L1 does not move, gray is displayed.

  Next, when the entire display surface is displayed in gray again, the application of the potential difference between the front electrode 31a and the back electrode 31b by the potential difference applying unit 35 is stopped (the potential difference is set to 0). Since the electroosmotic liquid L1 concentrated on the display surface 10a side of the transparent porous layer 10 permeates the entire transparent porous layer 10 by capillary force, the display surface is displayed in gray as described above. (See FIG. 4A).

  When displaying white, as shown in FIG. 4C, a potential difference is applied between the front electrode 31a and the back electrode 31b by the potential difference applying unit 35 so that the back electrode 31b side becomes-. For example, an electric field is formed in the thickness direction in the transparent porous layer 10 corresponding to the position (1, 1) and the position (3, 1) in FIG. The electroosmotic liquid L1 is concentrated and moved to the non-display surface 10b side of the transparent porous layer 10 by the action of electric force on the electroosmotic liquid L1 in the layer 10. Thereby, in the position (1, 1) and the position (3, 1), the illumination light La is scattered by the colorless and transparent transparent porous layer 10, and the transparent porous layer 10 is displayed as opaque white.

  As described above, the display of the display device 101 can be variously changed by the application of the potential difference by the potential difference applying unit 35.

  Next, a display device according to a second embodiment of the present invention will be described. FIG. 5 is a side view showing the display device of the present embodiment.

The display device 102 of the present embodiment is an improvement over the display device 101 of the first embodiment so that color display is possible, as shown in FIGS. 5 (a) and 5 (b). In addition, partition walls 41 extending in the thickness direction for individually dividing different positions (1), (2), (3), and (4) in a plane orthogonal to the thickness direction of the transparent porous layer 10 are provided. These partition walls 41 prohibit passage of the electroosmotic liquid, and furthermore, different colors for each position (1), position (2), position (3), and position (4), that is, yellow The electroosmotic liquids L _Y , L _M , L _C and L _K colored in (Y), magenta (M), cyan (C) and black (K) are permeated. Different positions (1), (2), (3), and (4) in the plane orthogonal to the thickness direction are different from each other in the electric force applied by the potential difference applying unit 35 to the electroosmotic liquid L1. It is a position where can act. Other configurations are the same as those of the display device 101. In the following description, the same components as those of the display device 101 are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation of the display device 102 will be described.

When the entire display surface of the device is displayed in white, the potential difference applying unit 35 applies a potential difference between the front electrode 31a and the back electrode 31b so that the back electrode 31b side becomes −, thereby FIG. As shown in FIG. 4, the electroosmotic liquids L _Y , L _M , L _C , and L _K are generated by the action of the electric force on the electroosmotic liquids L _Y , L _M , L _C , and L _K at each position in the transparent porous layer 10. Are concentrated and move toward the non-display surface 10b side of the transparent porous layer 10, so that the illumination light is scattered by the colorless and transparent transparent porous layer 10 and the transparent porous layer 10 is displayed as opaque white.

Next, for example, when displaying yellow (Y) and cyan (C), as shown in FIG. 5B, the potential difference applying unit 35 causes yellow (Y) and cyan ( At position (1) and position (3) corresponding to C), a potential difference is applied between the front electrode 31a and the back electrode 31b so that the front electrode 31a side is negative. By applying the potential difference, an electric field is formed in the thickness direction of the transparent porous layer 10 at the positions (1) and (3), and the electroosmotic liquids L _Y and L _C in the positions (1) and (3). since the electroosmotic liquid L _Y by the action of the electric _force, L _C is moved concentrate to the display surface 10a of the transparent porous layer 10, colored against the electro-osmotic liquid L _Y is at position (1) appears yellow is the color, cyan is a color which is colored with respect to the electro-osmotic liquid L _C is displayed at a position (3). Here, at positions (2) and (4), which are the corresponding positions of magenta (M) and black (K), the potential difference is not changed, so that it is displayed in white.

  Next, when displaying white at the position (1) and the position (3) again, the potential difference applying unit 35 causes the back electrode between the front electrode 31a and the back electrode 31b at the positions (1) and (3). A potential difference is applied so that the 31b side becomes-. Thereby, the position (1) and the position (3) are displayed in white (see FIG. 5A).

  In the first and second embodiments, an electric field is formed in the thickness direction of the porous layer, and the electroosmotic solution is moved in the direction. However, FIG. b), the first electrode 31c and the second electrode 31d are formed on the display surface 10a side of the transparent porous layer 10, and the potential difference is applied between the first electrode 31c and the second electrode 31d by the potential difference applying unit 35. To form an electric field in the surface direction and move the electroosmotic liquid in that direction.

The perspective view which shows schematic structure of the display apparatus by the 1st Embodiment of this invention. The perspective view which shows the structure which makes an electric force act on electroosmotic liquid The figure which shows the other structure which makes an electric force act on an electroosmotic liquid The perspective view which shows a mode that a display is performed with a display apparatus. The side view which shows schematic structure of the display apparatus of 2nd Embodiment The side view which shows the further different aspect of the display apparatus by this invention Side view showing a schematic configuration of a conventional display device

Explanation of symbols

10 transparent porous layer 30 permeate moving means 41 partition wall 101 and 102 display device L1 electroosmotic liquid _{L Y, L M, L C} , L K electroosmotic fluid

Claims (8)

A colored electroosmotic liquid, a porous layer made of a material having a color different from that of the electroosmotic liquid, the electroosmotic liquid being able to permeate the internal pores, and an electric force acting on the electroosmotic liquid to form the porous A permeate moving means for moving the electroosmotic liquid in the porous layer in the thickness direction of the porous layer or in a plane direction perpendicular to the thickness direction,
In the portion where the electroosmotic liquid on the display surface side of the porous layer is concentrated, the porous layer is displayed in a color based on the electroosmotic liquid, and the electroosmotic liquid on the display surface side of the porous layer is The display device, wherein the porous layer is displayed in a color based on the porous layer in a non-concentrated portion. The display device according to claim 1, wherein a pore diameter of the porous layer is 0.1 μm or more and 10 μm or less. The display device according to claim 1, wherein a thickness of the porous layer is 10 μm or more and 200 μm or less. The porous layer is made of nitrocellulose, acetylcellulose, cellulose acetate, vinyl chloride, polypropylene, polyamide, polytetrafluoroethylene, polyolefin, polysulfone, glass, or alumina. 4. The display device according to any one of items 3. The porous layer is made of a mixture obtained by combining any two or more of cellulosic materials, resin materials, porcelain materials, and glass materials. The display device according to item. The porous layer is configured so that the electroosmotic liquid cannot move between different positions in the planar direction of the porous layer, and the electroosmotic liquids of different colors with respect to the different positions The display device according to claim 1, wherein the display device is permeated. The permeate moving means is composed of electrodes disposed on both the front and back surfaces of the porous layer, and a potential difference applying unit that provides a potential difference between the electrodes disposed on the front and back surfaces. The display device according to claim 1. The osmotic fluid moving means is capable of applying different electric forces in the thickness direction to the electroosmotic fluids present at different positions in the planar direction of the porous layer. The display device according to claim 1, wherein the display device is a display device.

Images