JP2005250354A - Electrophoresis display device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily manufacturing an electrophoresis display device having superior reliability and display characteristics and an electrophoresis display device manufactured by using the same method. <P>SOLUTION: Disclosed is the electrophoresis display device equipped with 1st and 2nd substrates arranged opposite each other, partition walls provided between those substrates to surround small areas in a lattice shape, insulating liquid provided between the 1st and 2nd substrates, a plurality of charged particles dispersed in the insulating liquid, a 1st electrode provided corresponding to respective pixels, a 2nd electrode provided on the 1st or 2nd substrate corresponding to the respective pixels, and a driving means of applying a voltage to the 1st and 2nd electrodes, the partition walls having a 1st structure having holes in at least portions of two opposite sides and sectioning the respective small areas and a 2nd structure provided closing the holes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

In recent years, portable information terminals have been rapidly developed, and the need for low power consumption, light weight, and thin display devices is increasing. At present, reflection type liquid crystal display devices are widely used as displays of portable information terminals. However, since the reflective liquid crystal display device uses a polarizing plate, the light use efficiency is low, and sufficient brightness cannot be obtained depending on the use environment, and the display visibility may be poor.

An electrophoretic display device is known as a method for obtaining a bright reflective display without using a polarizing plate. This apparatus has a structure in which a dispersion liquid is sandwiched between a pair of substrates on which transparent electrodes are formed. The dispersion liquid is composed of charged particles (charged particles), an insulating liquid colored by dissolving a pigment, and the like. When a voltage is applied to the dispersion through the transparent electrode, charged particles having a charge move to an electrode having a polarity opposite to that of the charge. When charged particles gather on the observer side electrode, the color of the charged particles is displayed. On the other hand, when charged particles gather on the electrode opposite to the observer side, the observer visually recognizes the color of the insulating liquid. That is, the display is performed by the difference in color between the charged particles and the insulating liquid.

In the electrophoretic display device, it is effective to prevent the movement of particles between pixels by providing partition walls around the pixels to divide the dispersion into small areas. In other words, if a partition wall is formed in the periphery of each pixel (small area), there is no movement of charged particles due to convection of the dispersion liquid between adjacent pixels, and a display device with excellent retention can be made. It is. However, when a partition is provided,
When forming a dispersion layer between substrates, an injection method that is often used in liquid crystal display devices, that is, a method of injecting a dispersion liquid by using a capillary phenomenon from an injection port provided at the edge of the substrate. It becomes difficult. The following methods have been proposed as a method for enclosing the dispersion in the electrophoretic display device having the partition walls.

One is a method that enables multicolor display by providing a partition wall (bank portion) around each pixel and putting a dispersion liquid of various colors into each pixel using an ejection device (for example, Patent Document 1). This discharge device is the same as the ink jet device used in the ink jet printer, and the dispersion liquid can be put into each pixel separated by a partition wall. However, this method using an ink jet apparatus has a problem that it takes a long time to discharge the dispersion. For example, in order to discharge a dispersion liquid with an inkjet apparatus having 10 nozzles on an electrophoretic display device with 1 million pixels, operations of aligning the nozzles on the desired pixels, discharging the dispersion liquid, and moving the nozzles are performed. Must be repeated 100,000 times. Therefore, mass productivity is low.

There is also a method of forming a flow path using an adhesive layer on a partition wall and injecting a liquid dispersion medium (see, for example, Patent Document 2). In this method, it is considered that injection can be performed in a relatively short time. However, since this adhesive layer is uncured at the time of injection, the material of the adhesive layer elutes into the insulating liquid (liquid dispersion medium), or ionic impurities contained in the adhesive layer elute into the insulating liquid. There is a fear. When such elution occurs, the electrical resistance of the insulating liquid decreases,
It causes display defects such as burn-in and reduced contrast. Further, since the width of the partition walls is as narrow as about 100 μm, it is necessary to print an adhesive layer on the partition walls with high accuracy. If the printing position of the adhesive layer is shifted, an adhesive layer is attached to a portion other than the upper surface of the partition wall, resulting in a display failure. To ensure reliability, the width of the partition wall should be narrower than 100 μm. Seems to be difficult.
Japanese Patent Laid-Open No. 2001-235771 (page 3-4, FIG. 1) JP 2002-148663 A (page 3-7, FIG. 4)

As described above, conventionally, an electrophoretic display device having excellent reliability and display characteristics cannot be easily manufactured.

In view of this problem, an object of the present invention is to provide a method for easily manufacturing an electrophoretic display device having excellent reliability and display characteristics, and an electrophoretic display device manufactured using the method. .

Accordingly, the present invention provides a first substrate and a second substrate that are arranged to face each other, a partition wall that is provided so as to surround each small area in a lattice shape between the first substrate and the second substrate, and a first substrate. An insulating liquid provided between the first substrate and the second substrate, a plurality of charged particles dispersed in the insulating liquid, and a first electrode provided on the first substrate or the second substrate corresponding to each pixel. And a second electrode provided in correspondence with each pixel on the first substrate or the second substrate, and a driving means for applying a voltage to the first electrode and the second electrode, and the partition walls are opposed to each other. There is provided an electrophoretic display device comprising a first structure body having a hole provided in at least a part of each side and dividing each small area, and a second structure body provided to close the hole. .

  In the present invention, the small area may be composed of one or a plurality of pixels.

In the present invention, the first structure may be bonded to the first substrate, and the second structure may be bonded to the second substrate.

In the present invention, the first structure may be formed so as to surround the small area, and the hole may be provided in a part of each of the two opposite sides.

  In the present invention, the hole may be provided at the center of each of the two opposite sides.

Moreover, in this invention, a hole may be provided so that it may become alternate other than the center of each two sides which oppose.

In the present invention, the first filter having the first color provided on the second substrate and the first filter
A color filter including a second filter exhibiting a second color different from the color and a third filter exhibiting a third color different from both the first color and the second color; and the second structure includes the first filter and the first filter. 2
A laminated body in which the filter and the third filter are laminated may be included.

According to another aspect of the invention, there is provided a step of forming a first electrode provided corresponding to each pixel on one main surface of the first substrate or the second substrate, and the one main surface of the first substrate or the second substrate. And a step of forming a second electrode provided corresponding to each pixel, and a hole provided on at least a part of each of two opposite sides of the lattice on one main surface of the first substrate. Forming a first structure that divides each small area; forming a second structure having a size larger than the hole in a region corresponding to the hole on one main surface of the second substrate; A step of bonding one main surface of the first substrate and the second substrate facing each other so as not to block the hole between the first structure and the second structure, and a plurality of charged particles in the insulating liquid A step of injecting the dispersed dispersion between the first substrate and the second substrate through the holes, and the first substrate into which the dispersion is injected At least one of the second substrate is moved in the substrate surface, first
There is provided a method of manufacturing an electrophoretic display device comprising a step of closing a hole with a structure and a second structure.

  In the present invention, the small area may be composed of one or a plurality of pixels.

In the present invention, the first structure may be formed so as to surround the small area, and the hole may be provided in a part of each of the two opposite sides.

  In the present invention, the hole may be provided at the center of each of the two opposite sides.

Moreover, in this invention, a hole may be provided so that it may become alternate other than the center of each two sides which oppose.

According to the present invention, it is possible to provide a method for easily manufacturing an electrophoretic display device having excellent reliability and display characteristics, and an electrophoretic display device manufactured using the method.

Hereinafter, an electrophoretic display device according to an embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, an electrophoretic display device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a plan view showing an electrophoretic display device in the manufacturing process of the present embodiment, and FIG.
Is a plan view showing the electrophoretic display device of the present embodiment, and FIGS. 2A and 2B are FIGS.
It is sectional drawing between -a 'and sectional drawing between FIG.1 (b) bb'.

In FIG. 1, for convenience, four pixels are extracted and shown as a plan view, and a one-dot chain line in the center of the figure indicates a boundary portion of the pixels. That is, one pixel extends from the dotted line at the end of the figure to this alternate long and short dash line. In FIG. 2, the one-dot chain line in the center in the drawing indicates the boundary portion of the pixel, and one pixel extends from the dotted line at the end of the drawing to the one-dot chain line.

As shown in FIG. 2B, the electrophoretic display device of this embodiment includes a first substrate 3 and a second substrate 4.
And a partition wall 10 is provided between the first substrate 3 and the second substrate 4 so as to surround each pixel (each small area). The partition wall 10 includes a first structure 1 formed on the first substrate 3;
The second structure 2 is formed on the second substrate 4, and the first structure 1 and the second structure 2 surround each pixel in a lattice shape. Further, a pixel electrode (first electrode) 5 provided in an inner region surrounded by the partition 10, that is, a region corresponding to the pixel is formed on the first substrate 3, and the partition 10 is formed on the second substrate 4. A counter electrode (second electrode) 6 provided in a corresponding region is provided. The pixel electrode 5 is connected to the TFT element 23 formed on the first substrate 3, and the counter electrode 6 is driven (
A voltage application circuit (not shown) is connected. A surface coat layer 9 is formed on the surfaces of these electrodes 5 and 6. And the 1st board | substrate 3 with which these electrodes were formed, the 2nd board | substrate 4,
Between the partition walls 10, a dispersion liquid 11 made of an insulating liquid 8 in which the charged particles 7 are dispersed is disposed.

Then, as shown in FIG. 1B, the first structure 1 and the second structure 2 are respectively composed of the first substrate 3 and the first substrate 3.
And the second substrate 4 are in contact with each other. There is a hole 31 at the center of each of the two opposite sides of the first structure 1 that forms almost the whole including the four corners of the lattice, and the hole 31 is closed by the second structure 2 that is larger than the hole 31. As shown in FIG. 1A, when the dispersion 11 is injected, the hole 31 is used as a flow path without closing, and the hole 31 is closed after the dispersion 11 is injected.

Next, the display principle of the electrophoretic display device of the present embodiment will be described in the case where members having the following characteristics are used. The charged particles 7 are black and are positively charged. A transparent liquid is used as the insulating liquid 8 in which the charged particles 7 are dispersed. Transparent substrates such as glass are used for the first substrate 3 and the second substrate 4, and ITO (Indium) is used for the first electrode 5 and the second electrode 6.
A transparent electrode such as tin oxide) is used. A white plate (not shown) is placed outside the second substrate 4 and the first substrate 3 side is used as an observation surface. The partition walls 1 and 2 are made of a transparent material. In FIG. 2B, the left pixel performs white display and the right pixel performs black display.

2B, when the second electrode 6 is set to the reference potential (zero volts) and a positive voltage is applied to the first electrode 5, the charged particles 7 move to the vicinity of the second electrode 6. To do. When the electrophoretic display device is viewed from the first substrate 3 side, the first electrode 5, the first substrate 3, and the second substrate 4 are all transparent, so that a white plate placed outside the second substrate 4 is used. The color is visually recognized and white display is obtained.

As shown in the pixel on the right side of FIG. 2B, when the second electrode 6 is set to the reference potential (zero volts) and a negative voltage is applied to the first electrode 5, the charged particles 7 move to the vicinity of the first electrode 5. To do. When this electrophoretic display device is viewed from the first substrate 3 side, the first electrode 5 and the first substrate 3 are transparent, and the black color of the charged particles 7 is visually recognized, resulting in black display.

In this example, the case where the charged particles 7 are black has been described. However, the charged particles 7 may be light-absorbing particles colored such as cyan, magenta, yellow, purple, and gray. Insulating liquid 8
However, the white plate placed outside the second substrate 4 may be omitted by using a cloudy or colored liquid. On the contrary, the charged particles 7 may be light-scattering particles such as white, and the insulating liquid 8 may be light-absorbing colored black, cyan, magenta, yellow, purple, gray, or the like.

If no partition wall is provided in the periphery of the pixel, the charged particles 7 may move to the adjacent pixel due to the influence of the electric field or convection of the adjacent pixel. Further, if the substrate surface of the electrophoretic display device is placed vertically without providing the partition wall, when the specific gravity of the charged particles 7 is larger than the specific gravity of the insulating liquid 8, the charged particles 7 are electrically It settles to the lower side of the electrophoretic display device. In the case of the present embodiment, this problem does not occur because the partition 10 is provided in the periphery of the pixel. That is, even if the electrophoretic display device of the present embodiment is driven for a long time or stored for a long time, each pixel is surrounded by the partition wall, so that the concentration of the charged particles 7 in each pixel is adjusted. There is no change, display unevenness does not occur, and it has excellent display characteristics.

Next, a method for manufacturing the electrophoretic display device according to the present embodiment will be described with reference to FIGS. FIG. 3 is a cross-sectional view showing the manufacturing process of the electrophoretic display device of this embodiment, and two pixels are extracted and described. 4A and 4B are plan views showing the electrophoretic display device according to this embodiment, where FIG. 4A is a diagram viewed from the first substrate side, and FIG. 4B is a diagram viewed from the second substrate side.

First, the TFT element 23, the signal line 21, the gate line 22, the auxiliary capacitance line (not shown), and the first electrode 5 are formed on the first substrate 3 by a conventional method. The TFT element 23 has a gate electrode (not shown) connected to the gate line 22, a source electrode (not shown) connected to the signal line 21, a drain electrode (not shown) connected to the first electrode 5, and the first electrode 5. Are formed in a pixel region surrounded by the signal line 21 and the gate line 22. On the second substrate 4, the second electrode 6 is formed by a conventional method so as to form a lattice pattern in regions corresponding to the signal lines 21 and the gate lines 22. A surface coat layer 9 made of an organic film is formed on these electrodes. The surface coat layer 9 has a function of preventing the charged particles 7 from adsorbing on the surfaces of the electrodes 5 and 6 and flattening the unevenness of the electrodes 5 and 6. Depending on the dispersion 11 used, the effect of the present invention can be obtained even if the surface coat layer 9 is omitted.

As shown in FIG. 3A, the first structure 1 is formed on the main surface of the first substrate 3, and the second structure 2 is formed on the main surface of the second substrate 4 as shown in FIG. Are formed by a photolithography process.
At this time, the first structure 1 forms substantially the whole including the four corners of the lattice surrounding the pixel, and has a shape in which a hole 31 is opened at the center of each of two opposite sides of the lattice. The hole 31 includes a first opening 32 having a large opening on one side of the two opposite sides, and a first opening 32 on the other side.
There are two stages of the second opening 33 having a smaller opening. The second structure 2 is
The region corresponding to the two opposite sides described above is formed in a columnar shape having a width smaller than the first opening 32 and larger than the second opening 33.

As shown in FIG. 3C, the main surface of the first substrate 3 on the side where the first structure 1 is formed and the second substrate 4.
The main surface on the side where the second structure 2 is formed is bonded to face to face. At this time, the first structure 1
And the second structure 2 are not in contact with each other, and a flow path for the dispersion 11 to be injected in a later step is secured. An adhesive layer (not shown) may be applied to the peripheral portions of the substrates 3 and 4 except for the injection port and the exhaust port. In this case, the partition wall 10 becomes a wall by not providing the hole 31 in the peripheral portion except the injection port and the exhaust port portion, thereby preventing the dispersion liquid in contact with the adhesive from being injected into the pixel in a later process. I can do it.

As shown in FIG. 3D, a dispersion liquid 11 in which charged particles 7 are dispersed in an insulating liquid 8 is injected between the first substrate 3 and the second substrate 4. The injection direction is a direction parallel to two sides where the hole 31 is not formed. The arrow in FIG. 3D shows how the dispersion liquid 11 enters the gap between the first structure 1 and the second structure 2. By bringing the dispersion liquid 11 into contact with the inlets provided in the peripheral portions of the substrates 3 and 4, the dispersion liquid 11 is injected between the substrates 3 and 4 by capillary action. The air existing between the substrates 3 and 4 before the dispersion 11 enters is pushed out by the dispersion 11 and is naturally discharged from the exhaust port. When the non-volatile insulating liquid 8 is used for injection under vacuum, this outlet is not necessary.

As shown in FIG. 3 (e), at least one of the first substrate 3 and the second substrate 4 is moved in the in-plane direction of the substrate, and as shown in FIG. 1 (b), the holes 31 of the first structure 1 are formed. The first structure 1 and the second structure 2 are brought into contact with each other so as to be closed with the second structure 2. Since the width of the second structure 2 is smaller than the first opening 32 but larger than the second opening 33, the second structure 2 comes into contact with the first structure 1 and stops. Thereafter, the adhesive layer applied to the peripheral portions of the substrates 3 and 4 is cured. Further, the injection port and the exhaust port are sealed with an adhesive, and the dispersion 11 is sealed between the substrates 3 and 4. When the adhesive layer is not applied in advance, the adhesive is applied to the peripheral portion and then cured. Finally, a voltage application circuit (not shown) is connected to complete the electrophoretic display device.

If the electrophoretic display device is manufactured by the method of the present embodiment, the dispersion liquid 11 can be easily injected into the pixel even in the electrophoretic display device having the partition wall 10 in the peripheral portion of the pixel. In addition, the substrate 3,
4 Since the partition wall 10 exists between the adhesive layer provided in the peripheral portion and the dispersion 11, the adhesive layer and the dispersion 11 hardly contact each other. Therefore, the component of the adhesive layer does not dissolve in the dispersion liquid 11, and the dispersion liquid 11 can be enclosed in the partition wall 10 with high resistance. As a result, a highly reliable electrophoretic display device free from burn-in defects can be obtained.

Further, when the first structure 1 and the second structure 2 are shaped as shown in the present embodiment, the first opening 32 of the first structure 1 when the dispersion liquid 11 in FIG. 5 is injected. Side end and second structure 2
L1 is the distance from the first opening 32 side surface, and L2 is the distance between the second opening 33 side end of the first structure 1 and the second opening 33 side surface of the second structure 2. Then, it is preferable that at least one of L1 and L2 is about 5 μm or more. By setting the thickness to about 5 μm or more, bubbles can hardly be mixed at the time of injection, so that the display characteristics can be improved and the injection time can be shortened. In addition, as shown in FIG. 5, when the dispersion liquid 11 is injected, the distance between one of the two sides where the hole 31 of the first structure 1 is not formed and the second structure 2 is d1, When the distance between the other of the two and the second structure 2 is d2, it is preferable that at least one of d1 and d2 is about 5 μm or more. By setting the thickness to about 5 μm or more, bubbles can hardly be mixed at the time of injection, so that the display characteristics can be improved and the injection time can be shortened. Furthermore, W1>W3> W2 needs to be satisfied in order to close the opening. In addition, by setting W2 to about 15 μm or more, bubbles can hardly be mixed at the time of injection, so that display characteristics can be improved.

When a photosensitive material is used as a material constituting the first structure 1 and the second structure 2, the partition wall 10 can be easily formed. In particular, since the chemically amplified photosensitive epoxy resin has a high aspect ratio shape, the narrow partition wall 1 even when the distance between the first substrate 3 and the second substrate 4 is large.
0 can be formed.

When the partition 10 having a height of several tens of μm or more is formed of a photosensitive resin, light must enter the resin at a depth of several tens of μm or more during exposure. Therefore, the photosensitive resin used for the partition 10 is preferably a material having high transparency (light transmittance). Therefore, the completed partition 10 is transparent or translucent. In this case, in the partition wall 10 portion, light is always transmitted regardless of the electric field strength between the first electrode 5 and the second electrode 6, and the contrast is lowered. In order to prevent light leakage at the partition 10 portion, a light shielding layer may be provided at the partition 10 portion. The light shielding layer may be formed by patterning a chromium thin film by a photolithography process, a switching element such as a TFT (thin film transistor) 23, a wiring electrically connected to the switching element, or an auxiliary capacitor of the pixel. A storage capacitor line for forming the electrode may be used as a light shielding layer. By doing so, the step of forming the light shielding layer can be omitted.

The width of the portion where the first structure 1 and the second structure 2 are bonded to the first substrate 3 and the second substrate 4 is preferably 1 μm or more. If this width is less than 1 μm, the first substrate 3 and the second substrate 4 are shifted in the substrate plane and the first structure 1 and the second structure 2 are pressed against each other.
In some cases, the first structure 1 or the second structure 2 may be removed from the substrates 3 and 4.

In this embodiment, the counter electrode 6 in the form of a lattice is provided on the second substrate 4, and the partition wall 10 that is in the form of a lattice is provided on the first structure 1 and the second structure 2. The pattern of the partition wall 10 and the counter electrode 6 may not be the same, such as providing the counter electrode 6 in the center of the pixel. When the pattern of the partition wall 10 and the counter electrode 6 is not the same, the area ratio of the pixel electrode 5 and the counter electrode 6 is preferably about 5: 1 to 50: 1. It is preferable that the counter electrode 6 is provided at the periphery of the pixel as in the present embodiment, because the charged particles 7 can be moved at a lower voltage than when the counter electrode 6 is provided at the center of the pixel.

The average particle diameter of the charged particles 7 is preferably about 0.05 μm or more and 5 μm or less because a stable dispersion state can be obtained.

The small area divided by the partition wall 10 is a pixel unit in this embodiment, but may be a larger unit such as 9 pixel units instead of a pixel unit.

(First embodiment (first modification))
Next, a first modification according to the first embodiment will be described. In this modification, description of the same parts as those in the first embodiment will be omitted.

As shown in the cross-sectional view of FIG. 6, the electrophoretic display device of this modification is formed uniformly on one surface without forming the shape of the counter electrode 41 made of a transparent electrode into a lattice shape matching the shape of the partition wall 10. However, the first embodiment differs from the first embodiment in that the insulating liquid 8 is not transparent but white opaque and the first substrate 3 side is the observation surface.

Similarly to the first embodiment, driving is performed in the same manner as in the first embodiment, and the lower side of the drawing is the observation plane, the left pixel is white and the right pixel is black. However, the pixel on the left side is different in that a white display is obtained when a white opaque insulating liquid is visually recognized.

Also in this modification, the partition 10 has the same structure as that of the first embodiment. In other words, each pixel includes the first structure 1 on the first substrate 3 and the second structure 2 on the second substrate 4, and after the dispersion liquid 11 is injected, each pixel in the first structure 1 and the second structure 2. Is enclosed in a grid pattern. This lattice has a hole 31 in the center of each of the two opposite sides of the first structure 1 that forms almost the entire structure including the four corners of the lattice. It is blocking. When the dispersion 11 is injected, the hole 31 is used as a flow path without closing, and the hole 31 is closed after the dispersion 11 is injected.
By adopting such a configuration, as in the first embodiment, it is possible to obtain excellent display characteristics since display unevenness is unlikely to occur, and to obtain an effect of high reliability since it is difficult to cause image sticking defects. I can do it.

(First Embodiment (Second Modification))
Next, a second modification according to the first embodiment will be described. In this modification, description of the same parts as those in the first embodiment will be omitted.

As shown in the cross-sectional view of FIG. 7, the electrophoretic display device of the present modified example does not have the configuration in which the pixel electrode is formed on the first substrate and the counter electrode is formed on the second substrate. The second embodiment is different from the first embodiment in that a first electrode 42 used as a pixel electrode and a second electrode 43 having a smaller area than the first electrode 42 are formed. The second electrode 43 may be formed in a stripe shape common to the pixels in one row or column across the edge of the pixel. Further, the first electrode 42 has a shape that extends to the entire pixel at a portion other than the second electrode 43 and is connected to the TFT 23. The second electrode 43 is TF
The first electrode 42 may be a common electrode connected to T. Further, the second electrode 43 may have a lattice shape common to adjacent pixels.

Also in this modification, the partition 10 has the same structure as that of the first embodiment. In other words, each pixel includes the first structure 1 on the first substrate 3 and the second structure 2 on the second substrate 4, and after the dispersion liquid 11 is injected, each pixel in the first structure 1 and the second structure 2. Is enclosed in a grid pattern. This lattice has a hole 31 in the center of each of the two opposite sides of the first structure 1 that forms almost the entire structure including the four corners of the lattice. It is blocking. When the dispersion 11 is injected, the hole 31 is used as a flow path without closing, and the hole 31 is closed after the dispersion 11 is injected.
By adopting such a configuration, as in the first embodiment, it is possible to obtain excellent display characteristics since display unevenness is unlikely to occur, and to obtain an effect of high reliability since it is difficult to cause image sticking defects. I can do it.

The first and second modifications described above can also be applied to the second and subsequent embodiments described below.

(Second Embodiment)
Next, an electrophoretic display device according to a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, only differences from the first embodiment will be described, and description of similar parts will be omitted.

FIG. 8A is a plan view showing the electrophoretic display device in the manufacturing process of the present embodiment, and FIG. 8B is a plan view showing the electrophoretic display device of the present embodiment. In FIG. 8, for convenience, four pixels are extracted and used as a plan view, and a one-dot chain line in the center of the drawing indicates a boundary portion of the pixels. That is, 1
One pixel extends from the dotted line at the end of the figure to this alternate long and short dash line.

Also in the present embodiment, as in the first embodiment, the partition wall includes the first structure 1 on the first substrate and the second structure 2 on the second substrate, and after the dispersion liquid injection (FIG. 8 ( In b)), the first structure 1 and the second structure 2 surround each pixel in a grid pattern. This lattice has a hole 51 in the center of each of the two opposite sides of the first structure 1 that forms almost the entire structure including the four corners of the lattice. It is blocking. Then, when the dispersion liquid is injected (FIG. 8A)
Is used as a flow path without closing the hole 51, and the hole 51 is closed after the dispersion is injected.

However, this embodiment is different from the first embodiment in that the size of the hole 51 is not set in two stages as in the first embodiment, and is smaller than the second structure 2.

Also in this embodiment, as in the first embodiment, it is possible to obtain excellent display characteristics because display unevenness is unlikely to occur, and it is possible to obtain an effect that reliability is high because burn-in defects are unlikely to occur. Moreover, in this embodiment, the 2nd structure 2 protrudes and becomes a lattice with a protrusion. Therefore, the first embodiment in which the second structure 2 does not protrude is more preferable because the area of the pixel electrode can be increased. In addition, by setting W4 to 15 μm or more, it is difficult for bubbles to be mixed at the time of injection, so that display characteristics can be improved.

(Third embodiment)
Next, an electrophoretic display device according to a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, only differences from the first embodiment will be described, and description of similar parts will be omitted.

FIG. 9A is a plan view showing the electrophoretic display device in the manufacturing process of the present embodiment, and FIG. 9B is a plan view showing the electrophoretic display device of the present embodiment. In FIG. 9, for convenience, four pixels are extracted and used as a plan view, and a one-dot chain line in the center of the figure indicates a boundary portion of the pixels. That is, 1
One pixel extends from the dotted line at the end of the figure to this alternate long and short dash line.

Also in this embodiment, as in the first embodiment, the partition wall is composed of the first structure 1 on the first substrate and the second structure 2 on the second substrate, and after the dispersion liquid injection (FIG. 9 ( In b)), the first structure 1 and the second structure 2 surround each pixel in a grid pattern. This lattice has a first hole 52 and a second hole 53 on each of two opposite sides of the first structure 1 that forms almost the whole including the four corners of the lattice, and a second larger than the holes 52 and 53. The structure 2 closes the holes 52 and 53. When the dispersion liquid is injected (FIG. 9A), the holes 52 and 53 are not closed and used as a flow path, and the holes 52 and 53 are closed after the dispersion liquid is injected.

In the present embodiment, the positions of the holes 52 and 53 are not the center of the two opposite sides of the first structure 1, but are different from those of the first and second embodiments except for the center. Is different. At this time, the first hole 52 and the second hole 53 are preferably provided so as to be equidistant from the centers of the two opposing sides. By setting the distances to be equal, it is possible to obtain the effect that bubbles can be prevented from being generated without unevenly flowing the dispersion during injection. In addition, the first hole 52 and the second hole 53 need to be smaller than the second structure 2 so that they can be closed by the second structure 2, but they have the same size. Preferably there is. By making it the same magnitude | size, the effect that generation | occurrence | production of a bubble can be prevented can be acquired, without the flow of the dispersion liquid at the time of injection | pouring biasing.

Also in this embodiment, as in the first embodiment, it is possible to obtain excellent display characteristics because display unevenness is unlikely to occur, and it is possible to obtain an effect that reliability is high because burn-in defects are unlikely to occur.

(Fourth embodiment)
Next, an electrophoretic display device according to a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, only differences from the first embodiment will be described, and description of similar parts will be omitted.

FIG. 10A is a plan view showing the electrophoretic display device in the manufacturing process of this embodiment, and FIG.
) Is a plan view showing the electrophoretic display device of the present embodiment. In FIG. 10, for convenience, four pixels are extracted and used as a plan view, and a one-dot chain line in the center of this figure indicates a boundary portion of the pixels. That is, one pixel extends from the dotted line at the end of the figure to this alternate long and short dash line.

Also in the present embodiment, as in the first embodiment, the partition wall includes the first structure 1 on the first substrate and the second structure 61 on the second substrate, and after the dispersion liquid injection (FIG. 10 ( b)) is the first structure 1
And the second structure 61 surround each pixel in a grid pattern. This lattice has holes 51 on each of the two opposite sides of the first structure 1 that forms almost the entire structure including the four corners of the lattice, and the second structure 61 closes the holes 51. When the dispersion liquid is injected (FIG. 10A), the holes 5
1 is used as a flow path without blocking, and the hole 51 is closed after the dispersion is injected.

In the present embodiment, the size of the hole 51 is the same as that of the second embodiment in that the size of the hole 51 is not set in two stages as in the first embodiment. However, the second structure 61 is different from the first and second embodiments in that the size of the second structure 61 is exactly the same as that of the hole 51 and the hole 51 is closed after injection of the dispersion to form a complete lattice. . That is, in the above-described embodiment, after the dispersion liquid is injected, the second structure covers the hole and its periphery from one of the holes, whereas in the present embodiment, the second structure 61 is fitted in the hole 51. Yes.

Also in this embodiment, as in the first embodiment, it is possible to obtain excellent display characteristics because display unevenness is unlikely to occur, and it is possible to obtain an effect that reliability is high because burn-in defects are unlikely to occur. In addition, since the pixels defined by the partition walls are perfectly square, the movement of the charged particles during ON-OFF becomes smooth, and an effect that the response time is shorter than that of the first embodiment can be obtained. However, in this embodiment, when the holes 51 of the first structure 1 are closed with the second structure 61 after the dispersion liquid is injected, the holes 51 cannot be closed if the two substrates are displaced. Therefore, the first, second, and third embodiments described above can take an alignment margin.
It can be said that manufacture is easy.

(Fifth embodiment)
Next, an electrophoretic display device according to a fifth embodiment of the invention will be described with reference to FIG. In the present embodiment, only differences from the first embodiment will be described, and description of similar parts will be omitted.

FIG. 11A is a plan view showing an electrophoretic display device in the manufacturing process of the present embodiment, and FIG.
) Is a plan view showing the electrophoretic display device of the present embodiment. In FIG. 11, for convenience, four pixels are extracted and used as a plan view, and a one-dot chain line in the center of the figure indicates a boundary portion of the pixels. That is, one pixel extends from the dotted line at the end of the figure to this alternate long and short dash line.

Also in the present embodiment, as in the first embodiment, the partition walls are the first structures 62 on the first substrate.
And the second structure 63 on the second substrate. After the dispersion liquid is injected (FIG. 11B), the first structure 62 and the second structure 63 surround each pixel in a grid pattern. The lattice has holes 54 and 55 on the two opposite sides of the first structure 62, and the second structure 63 closes the holes 54 and 55. When the dispersion liquid is injected (FIG. 11A), the holes 54 and 55 are used as flow paths without closing them, and the holes 54 and 55 are closed after the dispersion liquid is injected.

Further, in this embodiment, the size of the holes 54 and 55 is the same as that of the second embodiment in that the size of the holes 54 and 55 is not set in two stages as in the first embodiment. However, the first structure 62 is different from the first and second embodiments in that it does not have a shape surrounding the four corners of the lattice. That is, the first structure 62 bears two opposite sides of the lattice and the center part of another pair of opposite sides, and the second structure 63 bears both ends of the other pair of opposite sides. is there. Therefore, in the first structure 62 alone, two holes of the third hole 54 and the fourth hole 55 are formed at both ends of the two opposite sides, and the hole 5
These holes 54 and 55 are closed by the second structure 63 composed of two members larger than 4 and 55.

Also in this embodiment, as in the first embodiment, it is possible to obtain excellent display characteristics because display unevenness is unlikely to occur, and it is possible to obtain an effect that reliability is high because burn-in defects are unlikely to occur. However, in the present embodiment, when the first substrate on which the first structure body 62 is formed and the second substrate on which the second structure body 63 is formed are bonded together, the first structure body may be out of alignment. 62
And the holes 54 and 55 which combined the 2nd structure 63 cannot be formed. Therefore, the first mentioned above,
It can be said that the second and third embodiments are easier to manufacture because a margin can be taken.

(Sixth embodiment)
Next, an electrophoretic display device according to a fifth embodiment of the invention will be described with reference to FIGS. In the present embodiment, only differences from the first embodiment will be described, and description of similar parts will be omitted.

FIG. 12A is a plan view showing an electrophoretic display device in the manufacturing process of this embodiment, and FIG.
) Is a plan view showing the electrophoretic display device of the present embodiment, and FIGS. 13A and 13B are views of FIG.
It is sectional drawing between a) cc 'and FIG.12 (b) Sectional drawing between dd'. FIG. 14 is a cross-sectional view of FIG. 12B viewed from the left side.

In FIG. 12, for convenience, four pixels are extracted and shown as a plan view, and a one-dot chain line in the center of the figure indicates a boundary portion of the pixels. That is, one pixel extends from the dotted line at the end of the figure to this alternate long and short dash line. In FIG. 13 and FIG. 14, the one-dot chain line in the center in the figure indicates the boundary portion of the pixel, and one pixel extends from the dotted line at the end of the figure to this one-dot chain line.

Also in the present embodiment, as in the first embodiment, the partition walls are the first structures 71 on the first substrate.
And the second structures 72, 73, 74 on the second substrate, and after the dispersion is injected (FIG. 12B)
The first structure 71 and the second structures 72, 73, 74 surround each pixel in a grid pattern. This lattice has holes 31 on each of the two opposite sides of the first structure 71 that forms almost the entire structure including the four corners of the lattice. The second structures 72, 73, and 74 are larger than the holes 31. 31 is blocked. When the dispersion liquid is injected (FIG. 12A), the hole 31 is used as a flow path without closing, and the hole 31 is closed after the dispersion liquid is injected.

In the present embodiment, the size of the hole 31 is not set in two stages as in the first embodiment, and the second
The point which is made smaller than the structures 72, 73, 74 is the same as that of the second embodiment.
However, the second structures 72, 73, 74 formed on the second substrate 4 are formed by laminating a red color filter layer 72, a green color filter layer 73, and a blue color filter layer 74 at predetermined positions, respectively. First, the point that the structure does not reach the first substrate 3, and therefore the point that the hole 31 of the first structure 71 formed in the first substrate 3 is not a deep hole reaching the first substrate 3 is the first, Second
This is different from the embodiment.

Next, the manufacturing method of the electrophoretic display device according to the present embodiment will be described only with respect to differences from the first embodiment. That is, the formation method of the first structure 71 and the red color filter layer 72, the green color filter layer 73, and the blue color filter layer 74 that double as the second structure and the color filter.
A method for forming the film will be described.

The first structure 71 is formed by performing photolithography processes twice on the main surface of the first substrate 3. In the first time, a part of the first structure 71, that is, the height that forms the bottom side of the hole 31 is formed uniformly, and in the second time, the side of the hole 31 is formed in addition to the hole 31 part. Thus, the first structure 71 is completed. The second structure 10 is formed by laminating each color filter layer in a predetermined region when the red color filter layer 72, the green color filter layer 73, and the blue color filter layer 74 are formed by a photolithography process. did.

Also in this embodiment, as in the first embodiment, it is possible to obtain excellent display characteristics because display unevenness is unlikely to occur, and it is possible to obtain an effect that reliability is high because burn-in defects are unlikely to occur. Further, in the present embodiment, since the color filter forming process and the second structure forming process are combined, it is possible to obtain an effect that the lithography process for forming the second structure can be omitted. Furthermore, since the first structure and the second structure of the present embodiment overlap in the direction perpendicular to the substrate surface, even if the distance between the two substrates changes due to the expansion or contraction of the dispersion liquid. It can function as a partition wall.

  Examples relating to each embodiment will be described below.

(Example 1)
An electrophoretic display device of Example 1 relating to the first embodiment as shown in FIGS. 1, 2, 3, 4 and 5 will be described. It should be noted that the periphery of each pixel is surrounded by a partition wall, and the size of each pixel is 125 μm in length and 125 μm in width, L1 = 10 μm, L2 = 100 μm, d1
= 45 μm, d2 = 45 μm, W1 = 30 μm, W2 = 20 μm, W3 = 25 μm.

First, a TFT element 2 is formed on a first substrate 3 made of an alkali-free glass substrate having a thickness of about 0.7 mm.
3. A signal line 21, a gate line 22, and an auxiliary capacitance line (not shown) were formed by a conventional method. next,
A first electrode 5 made of ITO was formed. The first electrode 5 and the drain electrode of the TFT element 23, the signal line 21 and the source electrode of the TFT element 23, and the gate line 22 and the gate electrode of the TFT element 23 are electrically connected. Next, the second electrode 6 made of ITO was formed on the second substrate 4 made of an alkali-free glass substrate having a thickness of about 0.7 mm. Thereafter, a polyimide solution was spin-coated on the first electrode 5 and the second electrode 6 and heated on a hot plate to form a surface coat layer 9 having a thickness of 50 nm.

A chemically amplified photosensitive epoxy resin (negative type) was applied on the first substrate 3 and the second substrate 4 to a thickness of 30 μm using a spinner. After pre-baking with a hot plate at 95 ° C., exposure was performed through a photomask. This was baked on a hot plate at 95 ° C. and then developed by immersing in an organic solvent to form a first structure 1 and a second structure 2 each having a height of 30 μm. Thereafter, post-baking was performed on a hot plate at 180 ° C. to sufficiently cure the chemically amplified photosensitive epoxy resin. By this step, the partition walls 10 (first structure 1 and second structure 2) made of a cured product of the chemically amplified photosensitive epoxy resin were formed. Note that FIG.
), The first structure 1 has a shape in which a hole 31 is formed in the center of each of two opposite sides of the lattice, forming substantially the whole, including the four corners of the lattice surrounding the pixel. Reference numeral 31 denotes two stages, a first opening 32 having a large opening on one side of two opposite sides and a second opening 33 having an opening smaller than the first opening 32 on the other side. The second structure 2 has a columnar shape having a width smaller than the first opening 32 and larger than the second opening 33 in the region corresponding to the two opposite sides described above.

Next, a room temperature curable two-component epoxy adhesive mixed with a cylindrical glass rod having a diameter of 30 μm was applied to the peripheral portion of the second substrate 4 using a dispenser except for the inlet and the exhaust port. Thereafter, the second substrate 4 was placed on the first substrate 3 so that the main surface of the first substrate 3 and the main surface of the second substrate 4 were opposed to each other, and bonded together with the adhesive. At this time, as shown to Fig.1 (a), there exists space between the 1st structure 1 and the 2nd structure 2, and the flow path in the case of injection | pouring is ensured.

Before the adhesive was cured, the dispersion 11 was dropped into the inlet. The dispersion liquid 11 was injected between the substrates by capillary action, and all the pixels could be filled with the dispersion liquid 11. After that, while the first substrate 3 is fixed, the second substrate 4 is lightly pushed and shifted, as shown in FIG.
The 1st structure 1 and the 2nd structure 2 were made to contact so that the hole 31 of the 1st structure 1 might be plugged up with the 2nd structure 2. In this state, the first substrate 3 and the second substrate 4 were fixed for about 30 minutes, and the room temperature curing type two-component epoxy adhesive was cured. Next, the inlet and the outlet were sealed with an adhesive, and the dispersion 11 was sealed between the substrates.

In the dispersion 11, silicone oil was used as the insulating liquid 8, and carbon particles whose surfaces were coated with polystyrene were used as the charged particles 7. In this case, the insulating liquid 8 was transparent and the charged particles 7 were black. On the surface opposite to the surface on which the second electrode 6 of the second substrate 4 is formed,
Glossy paper (not shown) was pasted to make a white reflecting plate. Finally, a voltage application circuit (not shown) was connected to complete the electrophoretic display device. Since the heights of the first structure 1 and the second structure 2 are both 30 μm, the distance between the substrates of the completed electrophoretic display device is also 30 μm. Note that the gap between the substrates could be controlled with high accuracy by making the first structure 1 and the second structure 2 the same height.

When this electrophoretic display device was driven, the contrast was 8: 1 and the reflectance was 5 for white display.
An excellent display characteristic of 0% was obtained. Further, there was no display defect such as burn-in, and no reduction in contrast was observed even when driven for a long time. Further, in this example, the dispersion 1 can be obtained in about 5 minutes.
1 was completed, and it was proved that the injection method of this example was simple and excellent in mass productivity.

(Example 2)
Example 2 relating to the first modification of the first embodiment as shown in FIG. 6 will be described. In the present embodiment, the description of the same parts as those in the first embodiment will be omitted.

In this example, electrophoresis is performed in the same manner as in Example 1 except that the second electrode 41 is formed on one surface of the second substrate 4 and the white charged particles 7 and the black insulating liquid 8 are used. A display device was produced. ITO is used as the second electrode 41, and white titanium oxide particles (
The average particle diameter was 0.3 μm), and the insulating liquid 8 was a dimethyl silicon solution in which a black pigment (Sudan Black) was dissolved. As a result, the same effect as in Example 1 could be obtained.

(Example 3)
Example 3 relating to the second modification of the first embodiment as shown in FIG. 7 will be described. In the present embodiment, the description of the same parts as those in the first embodiment will be omitted.

In this example, an electrophoretic display device was produced in the same manner as in Example 1 except that both the first electrode 42 and the second electrode 43 were formed on the first substrate 3. The first electrode 42 and the second electrode 43 are ITO
The ratio of the first electrode 42 to the second electrode 43 was 10: 1. As a result, the same effect as in Example 1 could be obtained.

Example 4
Example 4 relating to the second embodiment as shown in FIG. 8 will be described. In the present embodiment, the description of the same parts as those in the first embodiment will be omitted.

In this example, the electrophoretic display device was manufactured in the same manner as in Example 1 except that the size of the hole 51 was not made two steps as in Example 1 and was smaller than that of the second structure 2. . The size of one pixel is 125 μm in length and 125 μm in width, L1 = 15 μm, L2 = 100 μm, d1 =
45 μm, d2 = 45 μm, W4 = 20 μm, and W3 = 25 μm. As a result, the same effect as in Example 1 could be obtained.

(Example 5)
Example 5 relating to the third embodiment as shown in FIG. 9 will be described. In the present embodiment, the description of the same parts as those in the fourth embodiment will be omitted.

In the present embodiment, the positions of the holes 52 and 53 are not set at the centers of the two opposing sides of the first structure 1, but are changed to other than the center in the same manner as in the fourth embodiment. A device was made. The size of one pixel is 125 μm in length and 125 μm in width, L1 = 15 μm, L2 =
100 μm, d1 = 80 μm, d2 = 10 μm, W4 = 20 μm, and W3 = 25 μm. As a result, the same effect as in Example 4 could be obtained.

(Example 6)
Example 6 relating to the fourth embodiment as shown in FIG. 10 will be described. In the present embodiment, the description of the same parts as those in the fourth embodiment will be omitted.

In this example, the size of the second structure 61 is exactly the same as that of the hole 51, and electrophoresis is performed in the same manner as in Example 4 except that after the dispersion liquid is injected, the hole 51 is closed to form a complete lattice. A display device was produced. The size of one pixel is 125 μm in length and 125 μm in width, L1 = 15 μm, L2 =
70 μm, d1 = 42.5 μm, d2 = 42.5 μm, and W4 = W3 = 20 μm. As a result, the same effect as in Example 4 could be obtained. However, in this embodiment, the first structure 1 and the second structure 6 are accurately obtained so that the width of the hole 51 is equal to the width of the second structure 61.
1 must be produced.

(Example 7)
Example 7 relating to the fifth embodiment as shown in FIG. 11 will be described. In the present embodiment, the description of the same parts as those in the fourth embodiment will be omitted.

In the present embodiment, the first structure 62 bears the two opposite sides of the lattice and the center part of the other two opposite sides, and the second structure 63 has both ends of the other opposite two sides. An electrophoretic display device was produced in the same manner as in Example 4 except that the electrophoretic display device was formed. The size of one pixel is vertical 125
μm, width 125 μm, d3 = 45 μm, L3 = 30 μm, L4 = 80 μm, W5 = W
6 = 40 μm. As a result, the same effect as in Example 4 could be obtained. However, in this embodiment, there is a shift in the vertical direction of FIG. 11, or the first structure 62 and the second structure 6.
3 is not manufactured with high accuracy, the first structure 62 and the second structure 63 cannot be bonded to each other, so that accuracy is required.

(Example 8)
Example 8 relating to the sixth embodiment as shown in FIGS. 12, 13 and 14 will be described. In the present embodiment, the description of the same parts as those in the fourth embodiment will be omitted.

In this embodiment, the second structures 72, 73, and 74 formed on the second substrate 4 are respectively laminated with a red color filter layer 72, a green color filter layer 73, and a blue color filter layer 74 at predetermined positions. In other words, the hole 31 of the first structure 71 formed in the first substrate 3 is not a deep hole reaching the first substrate 3. Produced an electrophoretic display device in the same manner as in Example 4. The size of one pixel is 125 μm vertically and 12 horizontally
5 μm, L1 = 20 μm, L2 = 90 μm, d1 = 45 μm, d2 = 45 μm, W4
= 20 μm, W3 = 25 μm. The height of the first structure 71 from the surface of the first substrate 3 (surface coat layer 9) is T1, and the second substrate 4 (surface coat layer 9) of the second structures 72, 73, 74
) The height from the surface was T2, and T1 = 27 μm and T2 = 4.5 μm.

The method of manufacturing the electrophoretic display device according to the present embodiment will be described only with respect to differences from the fourth embodiment. That is, a method for forming the first structure 71 and a method for forming the red color filter layer 72, the green color filter layer 73, and the blue color filter layer 74 that also serve as the second structure and the color filter will be described.

On the first substrate 3 on which the first electrode 5 was formed, a chemically amplified photosensitive epoxy resin (negative type) was applied to a thickness of 27 μm using a spinner. After pre-baking with a hot plate at 95 ° C., exposure was performed through a photomask. After baking this on a hot plate at 95 ° C,
Development was performed by immersing in an organic solvent to form a portion (up to the height of T1) below the opening of the first structure 1 having a height of 27 μm. On top of this, a chemically amplified photosensitive epoxy resin (negative type) was applied to a thickness of 3 μm using a spinner. After pre-baking with a hot plate at 95 ° C., exposure was performed through a photomask. This was baked on a hot plate at 95 ° C. and then developed by immersing it in an organic solvent, and a structure having a height of 3 μm was laminated on the structure having a height of 27 μm formed previously except for the opening. Thereafter, post-baking was performed on a hot plate at 180 ° C. to sufficiently cure the chemically amplified photosensitive epoxy resin. Thereby, the first structure 71 having an opening was formed.

A photosensitive acrylic resin containing a red pigment was applied on the second substrate 4 to a thickness of 2 μm using a spinner. After pre-baking with a hot plate at 80 ° C., exposure was performed through a photomask. This was developed by immersing it in an organic alkali aqueous solution to form a red color filter layer 72 having a thickness of 2 μm and a part of the second structure. On top of this, a photosensitive acrylic resin containing a green pigment was applied to a thickness of 2 μm using a spinner. After pre-baking with a hot plate at 80 ° C., exposure was performed through a photomask. This was developed by immersing it in an organic alkali aqueous solution to form a green color filter layer 73 having a thickness of 2 μm and a part of the second structure. A part of the second structure is formed on a part of the second structure formed of a red color filter material. A photosensitive acrylic resin containing a blue pigment was applied on this to a thickness of 2 μm using a spinner. After pre-baking with a hot plate at 80 ° C., exposure was performed through a photomask. This was developed by immersing it in an organic alkaline aqueous solution to form a blue color filter layer 73 having a thickness of 2 μm and a part of the second structure. A part of the second structure is formed on a part of the second structure formed of red and green color filter materials, and the second structure is constituted by these three color filter materials. ing. Note that the height of the second structural body was 4.5 μm by overlapping the red, green, and blue color filter layers.

When this electrophoretic display device was driven, the contrast was 8: 1 and the reflectance was 5 for white display.
An excellent display characteristic of 0% was obtained. Further, there was no display defect such as burn-in, and the contrast did not decrease even when driven for a long time. In addition, in this example, the injection of the dispersion liquid could be completed in about 10 minutes, and it was proved that the injection method of this example was simple and excellent in mass productivity.

Further, in this example, since the second structure was produced by laminating the color filter members, the photolithography process for forming the second structure could be omitted. In addition, since the first structure body and the second structure body of this embodiment overlap in the direction perpendicular to the substrate surface, the first structure body and the second structure function as a partition even if the distance between the substrates changes due to the expansion or contraction of the dispersion liquid. be able to.

It is a top view of the electrophoretic display device concerning a 1st embodiment of the present invention, and (a) shows before injecting dispersion liquid, and (b) shows after injecting dispersion liquid. It is sectional drawing of the electrophoretic display device which concerns on the 1st Embodiment of this invention, (a) is sectional drawing between aa 'of Fig.1 (a), (b) is b of FIG.1 (b). It is sectional drawing between -b '. (A), (b), (c), (d), (e) is a sectional view showing a manufacturing process of the electrophoretic display device according to the first embodiment of the present invention. It is a top view which shows the electrophoretic display device which concerns on the 1st Embodiment of this invention, (a) is the figure seen from the 1st board | substrate side, (b) is the figure seen from the 2nd board | substrate side. It is a top view explaining the distance between the 1st structure and the 2nd structure at the time of pouring a dispersion. It is sectional drawing which shows the electrophoretic display device which concerns on the 1st modification of the 1st Embodiment of this invention. It is sectional drawing which shows the electrophoretic display device which concerns on the 2nd modification of the 1st Embodiment of this invention. It is a top view of the electrophoretic display device which concerns on the 2nd Embodiment of this invention, (a) is before inject | pouring a dispersion liquid, (b) shows after inject | pouring a dispersion liquid. It is a top view of the electrophoretic display device which concerns on the 3rd Embodiment of this invention, (a) is before injecting a dispersion liquid, (b) shows after inject | pouring a dispersion liquid. It is a top view of the electrophoretic display device which concerns on the 4th Embodiment of this invention, (a) is before inject | pouring a dispersion liquid, (b) shows after inject | pouring a dispersion liquid. It is a top view of the electrophoretic display device which concerns on the 5th Embodiment of this invention, (a) is before injecting a dispersion liquid, (b) shows after inject | pouring a dispersion liquid. It is a top view of the electrophoretic display device which concerns on the 6th Embodiment of this invention, (a) is before inject | pouring a dispersion liquid, (b) shows after inject | pouring a dispersion liquid. It is sectional drawing of the electrophoretic display device which concerns on the 6th Embodiment of this invention, (a) is sectional drawing between cc 'of Fig.12 (a), (d) is d of FIG.12 (b). It is sectional drawing between -d '. It is sectional drawing of the electrophoretic display device which concerns on the 6th Embodiment of this invention, and is sectional drawing seen from the left side of FIG.12 (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,62,71 ... 1st structure 2,61,63 ... 2nd structure 3 ... 1st board | substrate 4 ... 2nd board | substrate 5,42 ... 1st electrode 6,41,43 ... 2nd electrode 7 ... charged particle 8 ... Insulating liquid 9 ... Surface coat layer 10 ... Partition wall 11 ... Dispersion liquid 21 ... Signal line 22 ... Gate line 23 ... TFT elements 31, 51 ... Hole 32 ... First opening 33 ... Second opening 52 ... First Hole 53 ... second hole 54 ... third hole 55 ... fourth hole 72 ... red color filter layer 73 ... green color filter layer 74 ... blue color filter layer

Claims (12)

A first substrate and a second substrate disposed opposite to each other;
A partition provided to surround each small area in a lattice shape between the first substrate and the second substrate;
An insulating liquid provided between the first substrate and the second substrate;
A plurality of charged particles dispersed in the insulating liquid;
A first electrode provided corresponding to each pixel on the first substrate or the second substrate;
A second electrode provided corresponding to each pixel on the first substrate or the second substrate;
Driving means for applying a voltage to the first electrode and the second electrode;
The partition has a first structure that has holes provided in at least a part of each of two opposing sides, and a second structure that is provided so as to close the holes. An electrophoretic display device. The electrophoretic display device according to claim 1, wherein the small area includes one or a plurality of the pixels. The electrophoretic display device according to claim 1, wherein the first structure is bonded to the first substrate, and the second structure is bonded to the second substrate. 4. The electricity according to claim 1, wherein the first structure is formed so as to surround the small area, and the hole is provided in a part of each of the two opposite sides. Electrophoretic display device. The electrophoretic display device according to claim 4, wherein the hole is provided at a center of each of the two opposite sides. The electrophoretic display device according to claim 4, wherein the holes are provided in a manner other than the center of the two opposite sides. A first filter having a first color and a second color different from the first color are provided on the second substrate.
A color filter including a second filter exhibiting a color and a third filter exhibiting a third color different from both the first color and the second color;
The electrophoretic display device according to any one of claims 1 to 3, wherein the second structure includes a stacked body in which the first filter, the second filter, and the third filter are stacked. Forming a first electrode provided corresponding to each pixel on one main surface of the first substrate or the second substrate;
Forming a second electrode provided corresponding to each pixel on the one main surface of the first substrate or the second substrate;
Forming a first structure that has holes provided in at least a part of each of two opposite sides of the lattice on the one main surface of the first substrate, and that partitions each small area;
Forming a second structure larger than the hole in a region corresponding to the hole on the one main surface of the second substrate;
Attaching the one main surface of the first substrate and the second substrate to face each other so as not to block the hole between the first structure and the second structure;
Injecting a dispersion in which a plurality of charged particles are dispersed in an insulating liquid between the first substrate and the second substrate through the holes;
Moving at least one of the first substrate and the second substrate into which the dispersion liquid has been injected within the substrate surface, and closing the holes with the first structure and the second structure. A method for manufacturing an electrophoretic display device. The method of manufacturing an electrophoretic display device according to claim 8, wherein the small area includes one or a plurality of the pixels. 10. The electrophoretic display device according to claim 8, wherein the first structure is formed so as to surround the small area, and the hole is provided in a part of each of the two opposite sides. Method. The method of manufacturing an electrophoretic display device according to claim 10, wherein the hole is provided at a center of each of the two opposing sides. The method of manufacturing an electrophoretic display device according to claim 10, wherein the holes are provided to be staggered except for the centers of the two opposite sides.

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