JP2013235095A - Display device and manufacturing method of display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device enabling high yield and high definition and to provide a manufacturing method of the display device.SOLUTION: A display device includes a first substrate 10 provided with a first electrode 12, a second substrate 20 provided with a second electrode 22 facing to the first electrode 12, barrier plates 30 protruding from a side of the first substrate 10 to a side of the second substrate 20 and partitioning a space between the first substrate 10 and the second substrate 20 into a plurality of unit spaces 40, and a display medium 41A encapsulated in each of the unit spaces 40 and including charging particles 42 which move between the first electrode 12 and the second electrode 22 by an electric field generated between the first electrode 12 and the second electrode 22. The first substrate 10 is provided with a drive circuit for driving the first electrode 12. The second substrate 20 is provided with a through hole 50 through which the unit space 40 is filled with the display medium 41A. The first substrate 10 is not provided with a through hole 50 through which the unit space 40 is filled with the display medium 41A.

Description

  The present invention relates to a display device and a method for manufacturing the display device.

  Display devices that display by moving charged particles such as EPD (Electrophoretic Display) and QRLPD (Quick Response Liquid Powder Display) are close to zero power consumption during the display period, and power consumption during the display switching period is also very high. Since it can be made small, it has come to be widely used especially in the field of portable information terminals such as electronic paper. In this type of display device, charged particles are enclosed between a pair of substrates, and an electric field is generated between electrodes formed on the inner surface of each substrate to control the movement of the charged particles. At this time, in order to prevent the charged particles from being biased in the surface of the substrate, the charged particle enclosing space is partitioned by partition walls to restrict the movement of the charged particles in the substrate surface direction (see Patent Document 1). Each unit space partitioned by the partition walls is called a cell.

JP-A-1-248183

  As a method for encapsulating charged particles in a cell, for example, a method described in Patent Document 1 is known. In Patent Document 1, a plurality of through holes are formed in an element substrate on which a pixel electrode, a thin film transistor, and the like are formed, and a display medium containing charged particles from one through hole (for example, a dispersion liquid in which charged particles are dispersed in a solvent). And the display medium is filled in the cell by evacuating from the other through hole. However, in this method, since a plurality of through holes per cell are formed in the element substrate, there is a problem that a region where the thin film transistor and various wirings are arranged on the element substrate is narrowed, and high definition is difficult. In addition, since such a fine circuit is formed on the element substrate, there is a problem that a process of opening a through hole is added, leading to a decrease in yield and an increase in cost.

  An object of the present invention is to provide a display device with a high yield and high definition, and a method for manufacturing the display device.

  The display device of the present invention includes a first substrate on which a first electrode is formed, a second substrate on which a second electrode facing the first electrode is formed, and from the first substrate side to the second substrate side. Projecting toward and partitioning a space between the first substrate and the second substrate into a plurality of unit spaces, sealed in each unit space, and between the first electrode and the second electrode A display medium including charged particles that move between the first electrode and the second electrode by a generated electric field, and a driving circuit that drives the first electrode is formed on the first substrate. In addition, a through hole for filling the unit medium with the display medium is formed in the second substrate, and a through hole for filling the unit medium with the display medium is formed in the first substrate. Is not formed.

  According to this configuration, since the through hole is not formed in the first substrate on which the drive circuit is formed, a wide area for arranging the thin film transistor and various wirings on the first substrate can be secured. Therefore, a display device with high yield and high definition can be provided.

  In the second substrate, the through hole is formed in a portion overlapping the partition as viewed from the normal direction of the second substrate, and the portion of the second substrate in which the through hole is formed and the partition A gap may be formed between the second substrate and the tip of the second substrate, and a sealing member for sealing the display medium may be filled in the through hole and the gap.

  According to this configuration, since the through hole is formed in a portion that does not directly contribute to display, it is possible to suppress deterioration in display quality.

  A sealing member that seals the through hole formed in the second substrate and covers the entire surface of the second substrate may be formed on the second substrate.

  According to this structure, since the part which seals a through-hole among sealing members becomes inconspicuous, the fall of display quality can be suppressed.

  The second substrate is provided with a color filter formed by arranging a plurality of colored layers, and the second substrate has the plurality of colored layers as viewed from the normal direction of the second substrate. The through hole is formed in a portion that overlaps at least one colored layer, and the portion of the sealing member that seals the through hole contains a pigment or dye of the same color as the colored layer. Also good.

  According to this configuration, it is possible to suppress deterioration in image quality due to the sealing member.

  The surface of the sealing member may be subjected to at least one of antireflection treatment and hardening treatment.

  According to this configuration, light reflection on the display surface can be suppressed by the antireflection treatment, and deterioration in display quality can be suppressed. Moreover, it can suppress that a display surface gets a damage | wound by a hardening process.

  A portion of the sealing member that seals the through-hole may have conductivity and be electrically connected to the second electrode.

  According to this structure, since the part which seals a through-hole among sealing members, and a 2nd electrode become the same electric potential, the fall of display quality can be suppressed.

  According to the method for manufacturing a display device of the present invention, a partition that partitions a plurality of unit spaces is formed on a first substrate on which a drive circuit is formed, and a second substrate is bonded to the first substrate through the partition. A first step, a second step of forming a through hole in the second substrate for filling a display medium containing charged particles in each unit space surrounded by the partition; and a second substrate formed on the second substrate. And a third step of filling the unit medium with the display medium from the through hole.

  According to this manufacturing method, since the through hole is not formed in the first substrate on which the drive circuit is formed, a wide area for arranging the thin film transistor and various wirings on the first substrate can be secured. Therefore, the yield is high and high definition is possible.

1 is a cross-sectional view illustrating a schematic configuration of an electrophoretic display device according to a first embodiment of the present invention. It is a flowchart which shows the manufacturing process of an electrophoretic display device. It is sectional process drawing which shows the manufacturing process of an electrophoretic display device. FIG. 4 is a sectional process diagram subsequent to FIG. 3; It is sectional process drawing which shows the 1st modification of the manufacturing process of an electrophoretic display apparatus. It is sectional drawing which shows schematic structure of the electrophoretic display device which concerns on 2nd Embodiment of this invention. It is a top view of a partition. It is sectional drawing which shows schematic structure of the electrophoretic display device which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows schematic structure of the electrophoretic display device which concerns on 4th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. This embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, an actual structure and a scale, a number, and the like in each structure are different.

  In the following embodiments, an electrophoretic display device will be described as an example of the display device of the present invention.

(First embodiment)
FIG. 1 is a cross-sectional view showing a schematic configuration of an electrophoretic display device 1 according to the first embodiment of the present invention.
As shown in FIG. 1, an electrophoretic display device (display device) 1 includes an element substrate (first substrate) 10, a counter substrate (second substrate) 20, a partition wall 30, an electrophoretic layer 41, and a sealing. The member 51 is provided.

The element substrate 10 is a substrate in which a pixel electrode 12 and an insulating layer 13 are formed on an element substrate body 11.
The element substrate body 11 uses a resin substrate made of an insulating resin material such as polycarbonate (PC) or polyethylene terephthalate (PET), or a glass substrate. The element substrate body 11 has a thickness in the range of 100 μm to 500 μm, for example.

  On the element substrate 10, drive circuits for various wirings such as source lines and gate lines for driving the pixel electrodes 12 are formed. The pixel electrode 12 is connected to a thin film transistor through a wiring, and a voltage can be selectively applied to the pixel electrode 12 by turning the thin film transistor on and off. The insulating layer 13 is formed so as to cover the thin film transistor on the element substrate body 11.

  The pixel electrode 12 is formed on the surface of the element substrate body 11 that faces the electrophoretic layer 41. The pixel electrode 12 is made of a conductive film such as aluminum (Al) or indium tin oxide (hereinafter abbreviated as ITO). The thickness of the pixel electrode 12 is, for example, about 50 nm.

The counter substrate 20 is a substrate in which a counter electrode 22 is formed on a counter substrate body 21.
The counter substrate body 21 uses a transparent substrate such as a glass substrate. The counter electrode 22 is formed on the surface of the counter substrate main body 21 that faces the electrophoretic layer 41. The counter electrode 22 is made of, for example, a transparent conductive film such as ITO. In the present embodiment, the surface of the counter substrate 20 constitutes the display surface 21a of the electrophoretic display device 1, and characters, images, and the like displayed on the display screen of the electrophoretic display device 1 are viewed from the counter substrate 20 side. It can be done.

  The partition wall 30 protrudes from the element substrate 10 side toward the counter substrate 20 side, and divides a space between the element substrate 10 and the counter substrate 20 into a plurality of unit spaces 40. Hereinafter, the unit space is referred to as a cell.

  In the present embodiment, one pixel electrode 12 is formed corresponding to one cell 40. However, the present invention is not limited to this, and a plurality of pixel electrodes 12 may be formed corresponding to one cell 40. .

  As a material for forming the partition wall 30, for example, various resin materials such as epoxy resin, acrylic resin, urethane resin, melamine resin, and phenol resin, and various ceramic materials such as silica, alumina, and titania are used. it can.

  The electrophoretic layer 41 includes an electrophoretic material 41A (display medium) having a plurality of electrophoretic particles 42 and a dispersion medium 43 in which the electrophoretic particles 42 (charged particles) are dispersed in each cell 40 of the partition wall 30. This is an encapsulated layer. The electrophoretic particles 42 move between the pixel electrode 12 and the counter electrode 22 by an electric field generated between the pixel electrode 12 and the counter electrode 22.

  The electrophoretic particles 42 are, for example, pigment particles, resin particles, or composite particles thereof. Examples of the pigment constituting the pigment particles include black pigments such as aniline black and carbon black, and white pigments such as titanium oxide and antimony oxide. Examples of the resin material constituting the resin particles include an acrylic resin, a urethane resin, a urea resin, an epoxy resin, polystyrene, and polyester. Examples of composite particles include those in which the surface of pigment particles is coated with a resin material or other pigment, the surface of resin particles coated with a pigment, or a mixture in which pigments and resin particles are mixed in an appropriate composition ratio. There are particles and so on. The electrophoretic particles 42 made of these various materials are dispersed in a dispersion medium, for example, in a positively or negatively charged state.

  The dispersion medium 43 is, for example, a lipophilic hydrocarbon solvent, and includes, for example, Isopar (registered trademark). That is, the dispersion medium 43 is, for example, a liquid containing any one of Isopar E, Isopar G, Isopar H, Isopar L, and Isopar M, or a liquid in which two or more of these are mixed, or these It is the liquid which mixed any one or more of these, and the hydrocarbon solvent of another kind.

  Alternatively, the dispersion medium 43 includes, for example, aliphatic hydrocarbons such as pentane, hexane, and octane, alicyclic hydrocarbons such as cyclohexane and methylcyclohexane, benzene, toluene, xylene, hexylbenzene, heptylbenzene, octylbenzene, Aromatic hydrocarbons such as benzenes (alkylbenzene derivatives) having a long-chain alkyl group such as nonylbenzene, decylbenzene, undecylbenzene, dodecylbenzene, tridecylbenzene, tetradecylbenzene, pyridine, pyrazine, furan, pyrrole , Aromatic heterocycles such as thiophene and methylpyrrolidone, methyl acetate, ethyl acetate, butyl acetate, ethyl formate and other esters, acetone, methyl ethyl ketone, diethyl ketone, methyl isobutyl ketone, rutile isopropyl ketone, Ketones such as clohexanone, nitriles such as acetonitrile, propionitrile, acrylonitrile, amides such as N, N-dimethylformamide, N, N-dimethylacetamide, carboxylates or other various oils, etc. These can be used alone or as a mixture.

  The counter substrate 20 has a through hole 50 for filling the cell 40 with the electrophoretic material 41A. The size (diameter) of the through hole 50 is about several tens of μm. On the other hand, the element substrate 10 is not formed with a through-hole for filling the cell 40 with the electrophoretic material 41A.

  In the present embodiment, the counter substrate 20 has two through holes 50 corresponding to the respective cells 40. Each through-hole 50 is disposed closer to the partition wall 30 in each cell 40. In addition, the arrangement number and arrangement position of the through holes 50 can be changed as appropriate.

  In the case of the present embodiment, since the through-hole 50 is formed in the counter substrate 20, the counter electrode 22 is also partially formed with an opening, but such an opening is displayed if the area is small. It has been clarified by the inventor's examination that the effect on the effect is minor.

  That is, when a voltage is applied between the pixel electrode 12 and the counter electrode 22, no voltage is applied to the opening of the counter electrode 22, and the electrophoretic particles 42 are not deposited. It was found that the particles 42 do not necessarily move following the electric field vector, but move while diffusing to some extent. For this reason, even if the counter electrode 22 is not present, if the size of the through hole 50 is small, it can contribute to display. Further, the present inventors consider that the display quality of the electrophoretic display device 1 is greatly influenced by the distribution state of the electrophoretic particles 42 in each cell 40, and the interface state of the counter substrate 20 hardly affects the display quality. From the above, it was found that the display quality can be maintained even if the through-hole 50 is provided in the counter substrate 20.

  In the present embodiment, from such knowledge, the through-hole 50 is formed on the counter substrate 20 side, and thereby, an electrophoretic display device with high display quality without impairing the design freedom on the element substrate 10 side. Is supposed to provide.

  A sealing member 51 for sealing the through hole 50 is formed on the counter substrate 20. As a forming material of the sealing member 51, for example, various resin materials such as an epoxy resin and an acrylic resin can be used. In addition, as a forming material of the sealing member 51, a material that does not react with the electrophoretic material 41A is used.

  Further, the forming material of the sealing member 51 is preferably transparent. This is because when the electrophoretic particles 42 move upward between the pixel electrode 12 and the counter electrode 22 by an electric field, the formation region of the through hole 50 also contributes to the display image.

  The refractive index of the counter substrate 20 and the refractive index of the sealing member 51 are preferably substantially equal. This is because if the difference between the refractive index of the counter substrate 20 and the refractive index of the sealing member 51 is large, light may be reflected at the interface between the counter substrate 20 and the sealing member 51. In order to suppress the light reflection, when the refractive index of the counter substrate 20 is n1 and the refractive index of the sealing member 51 is n2, the refractive index n1 of the counter substrate 20 and the refractive index n2 of the sealing member 51 are set. The difference | n1-n2 | is preferably 3 or less.

(Method for manufacturing electrophoretic display device)
FIG. 2 is a flowchart showing the manufacturing process of the electrophoretic display device according to this embodiment.
3 and 4 are cross-sectional process diagrams showing the manufacturing process of the electrophoretic display device according to this embodiment. In FIG. 3C, FIG. 4A, FIG. 4B, and FIG. 4C, illustration of the electrophoretic particles 42 and the dispersion medium 43 constituting the electrophoretic material 41A is omitted for convenience. To do.

In the method for manufacturing an electrophoretic display device according to this embodiment, a partition wall 30 that partitions a plurality of cells 40 is formed on an element substrate 10 on which a drive circuit is formed, and a counter substrate is formed on the element substrate 10 via the partition wall 30. 20, a second step of forming a through hole 50 in the counter substrate 20 for filling the electrophoretic material 41 </ b> A in each cell 40 surrounded by the partition wall 30, and a step of forming the counter substrate 20. A third step of filling the cell 40 with the electrophoretic material 41A from the through-hole 50,
Have

  Specifically, as shown in FIG. 2, a “substrate bonding step S <b> 1 (first step)” in which the counter substrate 20 is bonded onto the element substrate 10 via the partition wall 30, and a through hole 50 is formed in the counter substrate 20. “Through-hole forming step S2 (second step)” to be formed, “electrophoretic material filling step S3 (third step)” in which each cell 40 surrounded by the partition walls 30 is filled with the electrophoretic material 41A, and through And “through-hole sealing step S <b> 4” for sealing the hole 50.

  First, in the substrate bonding step S1, as shown in FIG. 3A, the counter substrate 20 is bonded to the element substrate 10 via the partition wall 30 to produce the first intermediate panel 1A. Since the first intermediate panel 1A is manufactured by a conventionally known method, detailed description thereof is omitted.

  Next, in the through hole forming step S2, as shown in FIG. 3B, the through hole 50 is formed in the counter substrate 20, and the second intermediate panel 1A 'is manufactured. Two through holes 50 are formed for each cell 40, and each cell 40 is formed closer to the partition wall 30.

  The through-hole 50 is not limited to being formed in the counter substrate 20 after the first intermediate panel 1A is manufactured, but is formed in the counter substrate 20 before the first intermediate panel 1A is manufactured, that is, when the counter substrate 20 is manufactured. It may be left.

  Next, in the electrophoretic material filling step S <b> 3, the electrophoretic material 41 </ b> A is filled into each cell 40 of the partition wall 30. As a filling method of the electrophoretic material 41A, for example, a vacuum injection method is used.

  Specifically, as shown in FIG. 3C, the second intermediate panel 1A ′ is turned upside down and introduced into the interior of the chamber 60 with the side where the through hole 50 is formed facing downward. It arrange | positions above the container 61 which accommodates the electrophoresis material 41A. In this state, the gas inside the chamber 60 is exhausted, and the inside of the chamber 60 is evacuated.

  Next, as shown in FIG. 4A, the second intermediate panel 1 </ b> A ′ is immersed in the electrophoretic material 41 </ b> A accommodated in the container 61 while the chamber 60 is evacuated. Then, since each cell 40 of the second intermediate panel 1A 'is also evacuated, the electrophoretic material 41A accommodated in the container 61 enters each cell 40 by capillary action.

  Next, as shown in FIG. 4B, the atmosphere is injected into the chamber 60 while the second intermediate panel 1 </ b> A ′ is immersed in the electrophoretic material 41 </ b> A accommodated in the container 61. Then, since the liquid level of the electrophoretic material 41A accommodated in the container 61 is pushed by the atmospheric pressure, each cell 40 of the second intermediate panel 1A ′ is filled with the electrophoretic material 41A without a gap. Next, the second intermediate panel 1 </ b> A ′ filled with the electrophoretic material 41 </ b> A in each cell 40 is taken out from the chamber 60.

Next, in the through hole sealing step S4, the through hole 50 is sealed with the sealing member 51 as shown in FIG. For example, the through-hole 50 is sealed by injecting a liquid material of the forming material of the sealing member 51 into the through-hole 50 by using a capillary phenomenon and solidifying the liquid material of the forming material of the sealing member 51.
Through the above steps, the electrophoretic display device 1 of the present embodiment is obtained.

  According to the electrophoretic display device 1 of the present embodiment, since the through hole is not formed in the element substrate 10 on which the drive circuit is formed, it is possible to ensure a wide region for arranging the thin film transistors and various wirings on the element substrate 10. it can. Therefore, it is possible to provide the electrophoretic display device 1 with a high yield and high definition.

(First modification)
FIG. 5 is a cross-sectional process diagram illustrating a first modification of the manufacturing process of the electrophoretic display device.
As shown in FIG. 5, the manufacturing process of the electrophoretic display device of the present modification is different from the above embodiment only in the electrophoretic material filling process S3 and the through hole sealing process S4. The other steps (substrate bonding step S1 and through-hole forming step S2) are the same as those described above, and a detailed description thereof will be omitted. In FIG. 5, illustration of the electrophoretic particles 42 and the dispersion medium 43 constituting the electrophoretic material 41 </ b> A is omitted for convenience.

  In the electrophoretic material filling step S3 according to this modification, as shown in FIG. 5, two through holes 50 are formed in the counter substrate 20 corresponding to each cell 40. One of the two through holes 50 functions as an injection hole for injecting the electrophoretic material 41 </ b> A into the cell 40. The other through hole 50 functions as an exhaust hole for exhausting the gas inside the cell 40.

  In this modification, an injection nozzle 70 that injects the electrophoretic material 41A into the cell 40, an exhaust nozzle 71 that exhausts the gas inside the cell 40, and the electrophoresis that leaks from the cell 40 and adheres to the surface of the counter substrate 20. A cleaner 72 that wipes off the material 41 </ b> A and a coater 73 that seals the through holes 50 formed in the counter substrate 20 and supplies a sealing member forming material 51 </ b> A covering the entire surface of the counter substrate 20 are used. The arrangement interval between the injection nozzle 70 and the exhaust nozzle 71 is substantially the same as the arrangement interval (pitch) between the two through holes 50.

  In the present modification, the second intermediate panel 1A ′ is movable relative to the injection nozzle 70, the exhaust nozzle 71, the cleaner 72, and the coater 73. Specifically, the second intermediate panel 1 </ b> A ′ is arranged on the transport conveyor with the side where the through hole 50 is formed facing upward. The second intermediate panel 1A 'is transported to the right side (arrow direction) in FIG. 5 by the transport conveyor.

  The configuration of the relative movement is not limited to this, and the second intermediate panel 1A ′ may be disposed at a fixed position, and the injection nozzle 70, the exhaust nozzle 71, the cleaner 72, and the coater 73 may be moved. The panel 1A ′, the injection nozzle 70, the exhaust nozzle 71, the cleaner 72, and the coater 73 may be moved.

  First, the second intermediate panel 1 </ b> A ′ is moved by a predetermined amount in the direction of the arrow, and the injection nozzle 70 is disposed immediately above one of the through holes 50. At this time, the exhaust nozzle 71 is disposed immediately above the other through hole 50.

  Next, the electrophoretic material 41 </ b> A is injected into the cell 40 by the injection nozzle 70, and the gas inside the cell 40 is exhausted by the exhaust nozzle 71. Thereby, the electrophoretic material 41 </ b> A can be filled inside the cell 40 while avoiding bubbles and the like remaining inside the cell 40. In the case where bubbles or the like do not remain in the cell 40, the exhaust nozzle 71 is not exhausted directly above the other through-hole 50, and is naturally exhausted.

  When the electrophoretic material 41A is injected into the cell 40 by the injection nozzle 70, if the electrophoretic material 41A leaks from the cell 40 and adheres to the surface of the counter substrate 20, the electrophoretic material 41A is wiped off by the cleaner 72. Note that this step is not necessary when the electrophoretic material 41 </ b> A does not adhere to the surface of the counter substrate 20.

  Further, by moving the second intermediate panel 1A 'by a predetermined amount in the direction of the arrow, the coater 73 is disposed immediately above the through hole 50 corresponding to the cell 40 filled with the electrophoretic material 41A. Then, the liquid material of the sealing member forming material 51 </ b> A is applied to the entire surface of the through hole 50 and the counter substrate 20 by the coater 73. Then, the through-hole 50 is sealed by solidifying the liquid material of the sealing member forming material 51A.

According to this modification, the electrophoretic material 41 </ b> A is injected into the cell 40 by the injection nozzle 70 and the gas inside the cell 40 is exhausted by the exhaust nozzle 71, so that bubbles or the like remain in the cell 40. The electrophoretic material 41A can be filled into the cell 40 while avoiding the above. For example, this is effective when the vacuum injection method cannot be used because the electrophoretic material 41A is highly volatile.
In addition, since the second intermediate panel 1A ′ is movable relative to the injection nozzle 70, the exhaust nozzle 71, the cleaner 72, and the coater 73, the work flows through the electrophoretic material filling step S3 and the through hole sealing step S4. Can be done at once. Therefore, the manufacturing efficiency can be improved.

(Second Embodiment)
FIG. 6 is a diagram showing a schematic configuration of the electrophoretic display device 2 according to the second embodiment of the present invention. FIG. 6A is a cross-sectional view showing a schematic configuration of the electrophoretic display device 2 corresponding to FIG. FIG. 6B is a view showing the main part of the partition wall, and is a cross-sectional view taken along the line AA of FIG.

  As shown in FIG. 6A, the electrophoretic display device 2 according to the present embodiment includes a counter substrate in which a through hole 150 is formed in a portion overlapping the partition wall 130 when viewed from the normal direction of the counter substrate 20. 20 is different from the first embodiment in that a gap 152 is formed between the portion where the through-hole 150 is formed and the tip of the partition wall 130 on the counter substrate 20 side. Since other configurations are the same as those of the electrophoretic display device 1 of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 6A, illustration of the electrophoretic particles 42 and the dispersion medium 43 constituting the electrophoretic material 41A is omitted for convenience.

  As shown in FIG. 6B, a concave notch 131 is formed at the tip of the partition wall 130 facing the portion where the through hole 150 of the counter substrate 20 is formed. The notch 131 forms a gap 152 communicating with the through hole 150 between the portion of the counter substrate 20 where the through hole 150 is formed and the tip of the partition wall 130. The through hole 150 and the gap 152 are filled with a sealing member 151 that seals the electrophoretic material 41A. In the present embodiment, the electrophoretic material 41 </ b> A is configured to fill the cell 40 through the through hole 150 and the gap 152.

  The concave notch 131 may not be formed at the tip of the partition wall 130. In this case, by forming a through hole larger than the width of the tip of the partition wall 130 in the counter substrate 20, a gap is formed between the portion of the counter substrate 20 where the through hole is formed and the tip of the partition wall 130. Can be formed.

  FIG. 7 is a plan view of the partition wall 130. In FIG. 7, reference numeral 130 a is a crossing portion of the partition wall 130 formed in a lattice shape surrounding the cell 40, and reference numeral 130 b is a side wall portion of the partition wall 130.

  When the through hole 150 is formed in the portion overlapping the partition wall 130 when viewed from the normal direction of the counter substrate 20, the through hole 150 may be formed at the intersection 130 a of the partition wall 130 as shown in FIG. 7. The through hole 150 may be formed in the side wall 130b of the partition wall 130.

  In the case where the through holes 150 are formed at the intersection 130a of the partition wall 130, it is only necessary to form one through hole 150 having a size that spans a part of the four cells 40. Therefore, the number of through holes 150 is reduced. can do. On the other hand, when the through hole 150 is formed in the side wall 130 b of the partition wall 130, the side wall 130 b of the partition wall 130 can be reinforced by sealing the through hole 150 with the sealing member 151.

  According to the electrophoretic display device 2 of the present embodiment, since the through-hole 150 is formed in a portion that does not directly contribute to display, it is possible to suppress display quality degradation.

  In the present embodiment, an example in which the partition wall 130 is formed in a lattice shape in plan view has been described. However, the present invention is not limited to this. For example, the present invention can be applied even when the partition walls are formed in other shapes such as a honeycomb shape in plan view.

(Third embodiment)
FIG. 8 is a cross-sectional view showing a schematic configuration of the electrophoretic display device 3 according to the third embodiment of the present invention, corresponding to FIG.

  As shown in FIG. 8, in the electrophoretic display device 3 of the present embodiment, a sealing member 251 that seals the through hole 50 formed in the counter substrate 20 and covers the entire surface of the counter substrate 20 is formed. This is different from the first embodiment. Since other configurations are the same as those of the electrophoretic display device 1 of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 8, illustration of the electrophoretic particles 42 and the dispersion medium 43 constituting the electrophoretic material 41A is omitted for convenience.

  As shown in FIG. 8, the sealing member 251 includes a first sealing portion 252 that seals the through hole 50 formed in the counter substrate 20, and a second sealing portion 253 that covers the entire surface of the counter substrate 20. ,have.

  For example, the sealing member 251 is prepared by first injecting a material for forming the first sealing portion 252 into the through-hole 50 and solidifying it, and then applying a paste or the like to a transparent film material on the entire surface of the counter substrate 20. The two sealing portions 253 can be formed by pasting.

  The surface of the sealing member 251 is subjected to antireflection treatment. In this embodiment, the uneven part by the anti-glare process is formed on the surface of the second sealing part 253.

  The first sealing portion 252 of the sealing member 251 has conductivity and is electrically connected to the counter electrode 22. As a forming material of the first sealing portion 252, for example, a conductive resin obtained by dispersing conductive particles such as metal particles such as silver or carbon particles in a resin material is used.

  According to the electrophoretic display device 2 of the present embodiment, the portion of the sealing member 251 that seals the through hole 50 (the first sealing portion 252) becomes inconspicuous, so that the display quality can be prevented from deteriorating.

  Moreover, according to this structure, the reflection prevention process can suppress light reflection on the display surface 253a, and can suppress deterioration in display quality.

  Moreover, according to this structure, since the part (1st sealing part 252) which seals the through-hole 50 among the sealing members 251 and the counter electrode 22 become the same electric potential, the fall of display quality can be suppressed.

  In the present embodiment, the antireflection treatment is performed on the surface of the sealing member 251, but the present invention is not limited to this. For example, the surface of the sealing member 251 may be hardened. Thereby, it can suppress that the display surface 253a is damaged.

(Fourth embodiment)
FIG. 9 is a cross-sectional view showing a schematic configuration of an electrophoretic display device 4 according to the fourth embodiment of the present invention, corresponding to FIG.
As shown in FIG. 9, the electrophoretic display device 4 of the present embodiment is provided with a color filter 323 formed by arranging a plurality of colored layers 323R, 323G, and 323B on the counter substrate 320, the counter substrate. When viewed from the normal direction of 320, the point that the through-hole 350 is formed in a portion that overlaps at least one of the colored layers 323R, 323G, and 323B is different from the first embodiment. Since other configurations are the same as those of the electrophoretic display device 1 of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 9, illustration of the electrophoretic particles 42 and the dispersion medium 43 constituting the electrophoretic material 41 </ b> A is omitted for convenience.

  As shown in FIG. 9, the counter substrate 320 includes a counter substrate body 321, a color filter 323, a black matrix 324, and a counter electrode 322.

  The counter substrate body 321 uses a transparent substrate such as a glass substrate. For example, the black matrix 324 is configured by dispersing carbon in a resin. The black matrix 324 is provided on the surface of the counter substrate main body 321 on the electrophoretic layer 41 side.

  The color filter 323 is provided in a region partitioned by the black matrix 324 on the surface of the counter substrate main body 321 on the side of the electrophoretic layer 41. The color filter 323 includes, for example, a red colored layer 323R, a green colored layer 323G, and a blue colored layer 323B.

  The counter electrode 322 is formed on the surface of the color filter 323 and the black matrix 324 that faces the electrophoretic layer 41. The counter electrode 322 is made of, for example, a transparent conductive film such as ITO.

  In the present embodiment, the counter substrate 320 is formed with two through holes 350 corresponding to the respective cells 40. In each cell 40, each through-hole 350 is disposed in a portion overlapping with the red colored layer 323R and the blue colored layer 323B when viewed from the normal direction of the counter substrate 320. In addition, the number of arrangement | positioning and the arrangement position of the through-hole 350 can be changed suitably.

  A sealing member 351 for sealing the through hole 350 is formed on the counter substrate 320. In the present embodiment, a material for forming the sealing member 351 is obtained by dispersing a pigment or dye having the same color as that of the colored layer in various resin materials such as an epoxy resin and an acrylic resin. For example, a material in which a pigment or dye having the same color as that of the red colored layer 323R is dispersed is used for the sealing member 351 disposed in a portion overlapping with the red colored layer 323R. On the other hand, for the sealing member 351 disposed in a portion overlapping with the blue colored layer 323B, a material in which a pigment or dye having the same color as that of the blue colored layer 323B is dispersed is used.

  According to the electrophoretic display device 4 of the present embodiment, it is possible to suppress deterioration in image quality due to the sealing member 351.

  In the above embodiment, an electrophoretic display device using an electrophoretic material as a display medium has been described as an example of a display device. However, the present invention is not limited to this, and an electrochromic material is used as the display medium. The present invention can also be applied to other display devices such as an electrochromic display device used as a display device and an electronic powder fluid display (QRLPD) using an electronic powder fluid (registered trademark) as a display medium.

DESCRIPTION OF SYMBOLS 1 ... Electrophoretic display device (display device), 10 ... Element substrate (first substrate), 12 ... Pixel electrode (first electrode), 20 ... Counter substrate (second substrate), 22 ... Counter electrode (second electrode) , 30, 130 ... partition walls, 40 ... cells (unit space), 41A ... electrophoretic material (display medium), 42 ... electrophoretic particles (charged particles), 50, 150, 350 ... through holes, 51, 151, 251, 351... Sealing member, 152... Gap, 252... First sealing portion (portion for sealing the through hole in the sealing member) 253 a... Surface of the sealing member 323. (Colored layer), 323G ... green colored layer (colored layer), 323B ... blue colored layer (colored layer), S1 ... substrate bonding step (first step), S2 ... through-hole forming step (second step), S3 ... Electrophoretic material filling step (third step)

Claims (7)

A first substrate on which a first electrode is formed;
A second substrate on which a second electrode facing the first electrode is formed;
A partition wall that projects from the first substrate side toward the second substrate side and divides a space sandwiched between the first substrate and the second substrate into a plurality of unit spaces;
A display medium including charged particles enclosed in each unit space and moving between the first electrode and the second electrode by an electric field generated between the first electrode and the second electrode;
A driving circuit for driving the first electrode is formed on the first substrate,
A through hole for filling the unit medium with the display medium is formed in the second substrate, and a through hole for filling the unit medium with the display medium is formed in the first substrate. Not displayed. In the second substrate, the through hole is formed in a portion overlapping the partition as viewed from the normal direction of the second substrate,
A gap is formed between the portion of the second substrate where the through hole is formed and the tip of the partition on the second substrate side,
The display device according to claim 1, wherein the through-hole and the gap are filled with a sealing member that seals the display medium.   3. The display device according to claim 1, wherein a sealing member that seals the through hole formed in the second substrate and covers the entire surface of the second substrate is formed on the second substrate. . The second substrate is provided with a color filter formed by arranging a plurality of colored layers,
In the second substrate, the through hole is formed in a portion overlapping with at least one colored layer among the plurality of colored layers when viewed from the normal direction of the second substrate,
The display device according to claim 3, wherein a portion of the sealing member that seals the through hole includes a pigment or a dye having the same color as the colored layer.   The display device according to claim 3, wherein at least one of an antireflection treatment and a hardening treatment is performed on a surface of the sealing member.   6. The display device according to claim 3, wherein a portion of the sealing member that seals the through-hole has conductivity and is electrically connected to the second electrode. Forming a partition partitioning a plurality of unit spaces on a first substrate on which a drive circuit is formed, and bonding a second substrate on the first substrate via the partition;
A second step of forming in the second substrate a through hole for filling a display medium containing charged particles in each unit space surrounded by the partition;
A third step of filling the display medium into the unit space from the through hole formed in the second substrate;
A manufacturing method of a display device including:

Images