JPH04307523A - Electrophoretic display element - Google Patents

Abstract

PURPOSE:To decrease the difference in and light shielding quantity in the boundary parts between block chambers when striped or meshed transparent block members are colored and light shielded in a display part by the dispersion of electrophoretic particles in a dispersion medium at the time of light shielding driving, thereby uniformizing the colors and light shielding quantity, improving appearance and preventing the partial transmission of incident light without being colored by the above-mentioned colors. CONSTITUTION:The striped or meshed transparent block members 3 of the electrophoretic display element have the plural one end side block chambers 30 and plural other end side block chambers 31 opening with deviation in position in the thickness direction S1 and the directions S2, S3 perpendicular thereto respectively on the one end face 3a side and other end face 3b side facing a 1st transparent substrate 1a and a 2nd transparent substrate 1b and are so constituted that there are no parts where either of the one end side block chambers 30 and the other end side block chambers 31 do not exist over the entire surface of a sealing space P when the light is projected in a visual observation direction.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophoretic display element.

0002

[Prior Art] Japanese Patent Application Laid-Open No. 59-34518 provides an electrophoretic panel that can maintain a uniform gap even when the display area is increased and that does not cause unevenness or aggregation of pigments (electrophoretic particles). For this purpose, a transparent conductive film is provided on at least one side to form a dispersed system injection part between two opposing substrate films, and this dispersed system injection part is divided into small sections of cells by a partition made of a non-conductive member. A configuration is disclosed.

0003

[Problem to be solved by the invention] Said Japanese Unexamined Patent Publication No. 59-34
In the case of the compartment body 3E disclosed in Japanese Patent No. 518 and shown in FIGS. 10, 11, and 12, the plurality of compartments 30e forming the cells of the small section are located at opposite end faces of the two substrate films, respectively. 33e side and the other end surface 34e side, and the width direction S2 is perpendicular to the thickness direction S1 of the partition body 3E.
and are arranged parallel to each other in the vertical and width direction S3, and when projected in the viewing direction, the parts where each compartment 30e does not exist (vertical walls 31e and horizontal walls 32 that partition each compartment 30e)
part e) is formed. For this reason, for example, when driving the element in a light-shielding manner, each compartment 30e colored by the light-shielding electrophoretic particles dispersed in the dispersion medium in each compartment 30e can be easily distinguished from the vertical wall 31e and horizontal wall 32e portion. , it looks bad.

Further, when the partition body 3E is formed of a transparent material, when the partition chamber 30e is driven to block light from the colored element, the vertical wall 31 is formed as shown in FIGS. 11 and 12.
The light R is partially transmitted through the side wall 32e and the side wall 32e, reducing the light shielding effect. An object of the present invention is to provide an electrophoretic display element that solves the above problems.

[0005]

[Means for Solving the Problems] The electrophoretic display element of the present invention includes a first transparent substrate, a second transparent substrate disposed opposite to the first transparent substrate, a first transparent substrate and a third transparent substrate. 2. A transparent dispersion medium sealed in a sealed space between the two transparent substrates, light-shielding electrophoretic particles dispersed in the dispersion medium, and a striped or mesh-shaped transparent section interposed in the sealed space. a member, and a first transparent electrode and a second transparent electrode formed on at least one of the first transparent substrate, the second transparent substrate, the striped or mesh-like transparent partition member, and the other one. , an electrophoretic display element configured such that an alternating current voltage or a direct current voltage is applied to the first transparent electrode and the second transparent electrode, wherein the stripe-shaped or mesh-shaped transparent partition members each include the first transparent electrode and the second transparent electrode. having a plurality of end-side compartments and a plurality of other-end compartments opening at positions shifted in a direction perpendicular to the thickness direction on the end face side and the other end face side facing the substrate and the second transparent substrate; The present invention is characterized in that, when projected in the viewing direction, there is no part of the entire surface of the enclosed space where either the end-side compartment or the other-end compartment does not exist.

The most significant feature of the electrophoretic display element of the present invention is the striped or mesh-like transparent partition member. (Hereinafter, for the sake of explanation, it will be referred to as a transparent partition member. Also, the explanation will be made assuming that the first transparent substrate and the second transparent substrate are held vertically.) The transparent partition member is located between the first transparent substrate and the second transparent substrate. It is a plate-shaped object interposed in the enclosed space, and for example, a non-conductive transparent synthetic resin plate or a transparent glass plate can be used. In addition, the transparent partition member is designed so that, when projected in the viewing direction, there is no part of the entire surface of the enclosed space (display area) where either the end compartment or the other end compartment does not exist. For example, if a part where the one end compartment exists and a part where the one end compartment does not exist are formed when viewed from the end face side facing the first transparent substrate, the one end compartment does not exist. This can be achieved by providing the other end compartment on the other end surface side, which is the back surface of the part. That is, the plurality of end-side compartments and the plurality of other-end-side compartments of the transparent partition member are located on the -end surface side and the other end surface side of the transparent partition member facing the first transparent substrate and the second transparent substrate, respectively. The opening is shifted in a direction perpendicular to the thickness direction.

[0007] Furthermore, the transparent partition member interposed in the enclosed space divides the micro-enclosed space in which a light-transmitting dispersion medium in which light-shielding electrophoretic particles are dispersed in the thickness direction (back and forth). are formed respectively on the - end face side and the other end face side, and in the horizontal (left-right width) direction or vertical (vertical height) direction, the - end face side is formed by a plurality of - end side compartments, The other end side is formed by a plurality of other end side compartments.

[0008] A plurality of - end side compartments (hereinafter referred to as each one end side compartment) and a plurality of other end side compartments (hereinafter referred to as each other end side compartment) are formed of the transparent synthetic resin plate. Alternatively, bottomed holes (recesses) formed on both sides of a transparent glass plate at regular intervals (equal intervals) in the horizontal and vertical directions perpendicular to the plate thickness can be used. The bottomed hole (recess) forming each one-end compartment has an opening that opens on the end surface side facing the first transparent substrate and a bottom portion on the other end surface side facing the second transparent substrate. Similarly, each of the bottomed holes (concave portions) forming the other end side compartments has an opening opening on the other end side facing the second transparent substrate and a bottom portion on the -end side facing the first transparent substrate. There is.

When the transparent partition member has a mesh shape, the bottomed hole (concave portion) has a shape that is visually observed from the one end surface side and the other end surface side, for example, a circle, a diamond, a rectangle (square, rectangle), a triangle, A hexagonal or similar shape can be used. In addition, the bottomed hole (recess) has a shape along the light transmission direction, for example, the opening side and the bottom side have the same hole diameter, or the opening side is wide and the bottom side is narrow. A concave shape having a hole diameter can be used. A bottomed hole (recess) formed on the one end surface side and a bottomed hole (recess) formed on the other end surface side.
The shapes may be symmetrical or asymmetrical, or may overlap each other when projected in the viewing direction.

Further, when the transparent partition member has a striped shape, the shape of the bottomed hole (concave portion) when viewed from the one end surface side and the other end surface side is, for example, a plurality of arcuate grooves in a spiral shape or concentric circles. It is possible to use one arranged in a shape. A transparent glass plate or a transparent resin plate can be used for the first transparent substrate and the second transparent substrate, and these plates may be slightly colored as long as they have translucency. The distance between the first transparent substrate and the second transparent substrate is preferably within a range of, for example, 50 to 150 μm.

[0011] The first transparent electrode and the second transparent electrode are
For example, it can be formed on the first transparent substrate and the second transparent substrate, or it can be formed on either one of the first transparent substrate or the second transparent substrate and the transparent partition member. That is,
Either the first transparent electrode or the second transparent electrode is formed on at least one of the first transparent substrate, the second transparent substrate, and the transparent partition member, and the other is formed on at least the first transparent substrate. , the second transparent substrate, and the transparent partition member. Also,
The first transparent electrode or the second transparent electrode formed on either the first transparent substrate or the second transparent substrate can be used either during light-shielding driving when an AC voltage is applied or during light-transmitting driving when a DC voltage is applied. One is used by switching from the other. The first transparent electrode or the second transparent electrode is preferably formed in a shape or position that allows incident light to pass through when electrophoretic particles are adsorbed. For example, the first transparent electrode and the second transparent electrode may have a stripe shape, a mesh shape, or a planar shape.
When forming the first transparent electrode and the second transparent electrode on the opposing inner surfaces of the first transparent substrate and the second transparent substrate, the electrode side with the polarity opposite to the polarity of the electrophoretic particles is formed in a striped or mesh shape. It is preferable that By adsorbing electrophoretic particles to the striped or mesh-shaped transparent electrode side, light incident from the first transparent substrate side or the second transparent substrate side can be transmitted between the striped or mesh-shaped transparent electrodes. It is from. Further, for example, one of the first transparent electrode and the second transparent electrode can be formed in a planar shape on the bottom or horizontal wall of each one end side compartment and each other end side compartment of the transparent partition member.

[0012] In addition to the first transparent electrode and the second transparent electrode, a third transparent electrode can be used. For example, when forming a first transparent electrode and a second transparent electrode on the first transparent substrate and the second transparent substrate, a third transparent electrode can be formed on the transparent partition member. In this case, an alternating current voltage is applied between the first transparent electrode and the second transparent electrode for light shielding driving, a direct current voltage is applied between the first transparent electrode and the second transparent electrode for light transmitting driving, or the first transparent electrode or the second transparent electrode An alternating current voltage is applied between the first transparent electrode and the third transparent electrode during light-shielding driving, a direct current voltage is applied between the first transparent electrode and the third transparent electrode during light-transmitting driving, or between the first transparent electrode and the second transparent electrode and the third transparent electrode.
It can be used in various ways depending on the purpose, such as applying an AC voltage between it and the transparent electrode for light-blocking driving, or applying a DC voltage for light-transmitting driving. Each of the transparent electrodes can be formed using various transparent conductive materials such as ITO (indium tin oxide) and tin dioxide, and can be formed using various conventionally known vacuum evaporation methods, high frequency sputtering methods, spray methods, and photoetching methods. It can be formed using, etc.

The light-transmitting dispersion medium is a non-conductive insulating medium, and may be uncolored and transparent, or may be slightly colored as long as it has light-transmitting properties. As the light-shielding electrophoretic particles, for example, particles made of a pigment that itself has a color, or particles whose surfaces are colored or coated with a coloring agent can be used. In addition, the electrophoretic particles are different from each other when the electrophoretic display element is not driven.
By manually switching between driving with a DC voltage applied and driving with an AC voltage applied, light-shielding electrophoretic particles are caused to move naturally due to the difference in specific gravity in the light-transmitting dispersion medium. Light is controlled by electrically forced movement or by changing to a dispersed state, allowing light to pass through, blocking light transmission, or reducing the amount of light transmitted.

The electrophoretic display element of the present invention can be used in a position upright from the horizontal direction, in a position parallel to the horizontal direction, or in a tilted position.

[0015]

[Operations and Effects] In the electrophoretic display element of the present invention, either the first transparent electrode or the second transparent electrode is connected to at least the first transparent substrate, the second transparent substrate, a striped or mesh-like transparent partition member. (hereinafter referred to as a transparent partition member), and either the first transparent electrode or the second transparent electrode is formed on at least the first transparent electrode.
It is formed on the other one of the transparent substrate, the second transparent substrate, and the transparent partition member. Further, the first transparent electrode or the second transparent electrode formed on either the first transparent substrate or the second transparent substrate is formed in a shape or position that allows incident light to pass through when electrophoretic particles are adsorbed. has been done. Then, it is used by switching from either one of the light-shielding drive in which an AC voltage is applied and the light-transmitting drive in which a DC voltage is applied. That is, during light-shielding driving, when an AC voltage is applied to the first transparent electrode and the second transparent electrode, the electrophoretic particles are electrophoresed in the dispersion medium of the plurality of negative end side compartments and the plurality of other end side compartments. and disperse. At this time, the stripe-shaped or mesh-shaped transparent partition member is arranged so that, when projected in the viewing direction, there is no part of the entire enclosed space where either the end-side compartment or the other-end compartment does not exist. Therefore, on the entire surface of the enclosed space (display area), the dispersion liquid is colored and opaque due to the dispersion of the electrophoretic particles, and it is possible to perform color display and light-shielding display, and to visually recognize this. be able to.

Therefore, when the electrophoretic display element of the present invention is driven in a light-shielding manner, the portion where the compartments are present at each one end of the striped or mesh-like transparent compartment member, the boundary portion between the compartments at each one end, and the other end This reduces differences in color and amount of light shielding between the area where the side compartments exist and the boundary area between each end compartment, and makes them almost uniform, improving the appearance, and ensuring that the incident light does not change to the aforementioned color. Partial transmission without being colored can be prevented.

[0017] In addition, during light-transmitting driving, electrophoresis is applied to either the first transparent electrode or the second transparent electrode formed on any one of the first transparent substrate, the second transparent substrate, and the transparent partition member. A DC voltage with the opposite polarity to the polarity with which the particles are charged is applied. Then, the light-shielding electrophoretic particles move to the part whose polarity is opposite to the polarity of the particles due to electric attraction and adhere to a position corresponding to either the first transparent electrode or the second transparent electrode. do. Therefore, the dispersion liquid becomes transparent and a translucent state is obtained.

Furthermore, in the electrophoretic display element of the present invention,
In addition to the above effects, the enclosed space formed between the first transparent substrate and the second transparent substrate has a stripe-like or mesh-like transparent structure having a plurality of compartments on one end side and a plurality of compartments on the other end side. Due to the interposition of the partitioning member, when switching from the non-driving state in which the electrophoretic particles float or settle in the dispersion medium due to the difference in specific gravity between the dispersion medium and the dispersion medium in each of the compartments, the electrophoretic particles are slightly All you have to do is move to . Therefore, even when the electrophoretic display element is made large, the response speed of the electrophoretic particles is fast during both drives, and the bright/dark display can be quickly switched without unevenness in response. It becomes possible to do so. In addition, even if the display area is increased, a uniform gap can be maintained.
In addition, the pigment (electrophoretic particles) is not biased and the electrophoretic particles do not aggregate. It is also possible to use this electrophoretic display element as a display element or as a window blind for an automobile or a house.

[0019]

EXAMPLES (First Example) The electrophoretic display element of this example will be explained with reference to FIGS. 1 to 5. This electrophoretic display element includes a first transparent substrate 1a, a second transparent substrate 1b, and a first
Transparent electrode 2a and second transparent electrode 2b, mesh-like transparent partition member 3 (hereinafter referred to as transparent partition member 3 for explanation), third transparent electrode 4, first transparent insulation coat film 5a, and It consists of a second transparent insulating coat film 5b, a spacer 6, a dispersion medium 7, and electrophoretic particles 8.

[0020] First transparent substrate 1a and second transparent substrate 1b
Both are made of transparent soda lime glass plates (manufactured by Asahi Glass) with a thickness of 2.0 mm. The first transparent electrode 2a and the second
The transparent electrodes 2b have first electrodes facing each other as shown in FIG.
Inner surface 10a of transparent substrate 1a and second transparent substrate 1b
Transparent ITO is vacuum-deposited to a thickness of about 1000 Å on the inner surface 10b by ion plating to form a linear shape.

The first transparent insulating coat film 5a and the second transparent insulating coat film 5b are connected to the first transparent electrode 2a and the second transparent insulating coat film 5b.
It is for insulating the transparent electrode 2b and the transparent partition member 3, and the inner surface 1 of the first transparent substrate 1a is coated with the first transparent electrode 2a and the second transparent electrode 2b.
0a and the inner surface 10b of the second transparent substrate 1b, a SiO2 vapor deposition film (t=1000 Å) was formed by vapor deposition.
It becomes more.

The transparent partition member 3 is a non-conductive transparent synthetic resin plate made of acrylic photosensitive resin and has a thickness t of 1.
00 μm. This transparent partition member 3 is shown in FIGS. 3 and 4 projected on the front A1 side and back A2 side of the element.
, as shown in FIG. 5, which is a perspective view of a cross section taken along line A-A in FIG.
On the end surface 3a side and the other end surface 3b side facing b, horizontal (left and right width) direction S2 and vertical (vertical height) direction S3 (FIG. 3,
When projected in the viewing direction (the front A1 side of the element or the back side A2 of the element), It is configured so that there is no part of the entire surface (display part) of the enclosed space P where either the end compartment 30 or the other end compartment 31 does not exist.

[0023] The end-side compartments 30 are arranged in the horizontal direction S2 and the vertical direction S3 at intervals of 100 μm on the one end surface 3a side of the transparent compartment member 3 facing the first transparent substrate 1a. . The other end side compartments 31 are arranged in the horizontal direction S2 and the vertical direction S3 at intervals of 100 μm on the other end surface 3b side of the transparent partition member 3 facing the back surface A2 side of the element.

Therefore, the transparent partition member 3 has one end surface 3
In the part where the one end compartment 30 on the a side is not formed,
The other end compartment 31 is formed on the other end surface 3b side which is the back surface. Further, the plurality of negative end side compartments 30 and the plurality of other end side compartments 31 are square bottomed holes (recesses), and have a hole diameter D of 100 μm and a hole depth L of 40 μm. (See Figures 3, 4, and 5). The one-end compartment 30 includes a rectangular peripheral wall 300, an opening 301 that opens toward the one end surface 3a, and a vertical inner bottom 302 that faces the other end surface 3b. The other end compartment 31 has a rectangular peripheral wall 310, an opening 311 that opens toward the other end surface 3b, and a vertical inner bottom 312 that faces the one end surface 3a.
It becomes more.

The third transparent electrode 4 is formed into a planar shape on the vertical inner bottom portion 302 of each one end side compartment 30 and the vertical inner bottom portion 312 of the other end side compartment 31 of the transparent partition member 3. The third transparent electrode 4 is formed into a planar shape by vacuum-depositing transparent ITO to a thickness of about 1000 Å by ion plating. As the dispersion medium 7, kerosene (manufactured by Nacalai Tesque) with a specific gravity of 0.8 is used. The electrophoretic particles 8 have a specific gravity of 1 which is greater than the specific gravity of the dispersion medium 7 of 0.8.
．． In No. 4, a black pigment (manufactured by Lovecolor Dainichiseika) was used. These are particles whose surfaces are negatively charged. Then, a dispersion liquid was prepared in which the concentration of the electrophoretic particles 8 was adjusted to 1% by weight and a small amount of a surfactant for dispersion stabilization was blended.

Next, with the one end surface 3a side of the transparent partition member 3 facing upward, the plurality of one end side compartment chambers 30 are filled with the dispersion liquid, and then the - end surface 3a side is traced with a flat plate to remove the excess dispersion liquid. and drying the - end surface 3a side,
A first transparent substrate 1 facing the first transparent insulating coat film 5a.
spacer 6 with a thickness of 100 μm is placed on the peripheral edge of the first transparent insulating coating film 5a and the peripheral edge of the first transparent insulating coating film 5a.
(Toray polyester) is placed on the first transparent substrate 1a.
Then, an epoxy adhesive (not shown) is applied around the spacer 6. Thereafter, the epoxy adhesive is cured to integrate the first transparent substrate 1a and the -end surface 3a side of the transparent partition member 3. Further, after that, with the other end surface 3b side of the transparent partition member 3 facing upward, and after filling the plurality of other end side compartment chambers 31 with the dispersion liquid, the other end surface 3b side is traced with a flat plate to remove the excess dispersion liquid. The other end surface 3b side is dried, and the second transparent substrate 1b is placed facing the second transparent insulating coating film 5b. Apply epoxy adhesive. Thereafter, the epoxy adhesive is cured to integrate the second transparent substrate 1b and the other end surface 3b of the transparent partition member 3. In this way, a cell portion is manufactured in which the transparent partition member 3 is interposed in the enclosed space P between the first transparent substrate 1a and the second transparent substrate 1b.

The first transparent electrode 2a and the second transparent electrode 2b are provided with an AC power source 90 and lead wires 91 and 92 for transmitting an AC voltage are connected thereto. Furthermore, the third transparent electrode 4, the first transparent electrode 2a, and the second transparent electrode 2b are connected to lead wires 94, 95, and 96, which are provided with a DC power source 93 and are used to transmit DC voltage. In the electrophoretic display element of the first embodiment configured in this manner, when an AC voltage (sine wave voltage) of 500 Hz frequency and 100 VAC is applied to the first transparent electrode 2a and the second transparent electrode 2b, the electric field changes. Due to the action, each electrophoretic particle 8 is
A dispersed state in the dispersion medium 7 is obtained as shown in FIG. Therefore, the electrophoretic display element is in a light-blocking state due to the light-blocking electrophoretic particles 8 dispersed in the transparent dispersion medium 7,
and dimmed. Therefore, the electrophoretic display element is in a light-shielding state and dimmed by the light-shielding electrophoretic particles 8 dispersed in the light-transmitting dispersion medium 7.

Here, according to the electrophoretic display element of the first embodiment, the entire surface of the enclosed space P (
Since the configuration is such that there is no part where either the end-side compartment 30 or the other end-side compartment 31 does not exist with respect to the display section), the entire surface of the enclosed space P (display section) is The coloring by the electrophoretic particles 8 dispersed in the dispersion medium 7 can be visually recognized evenly and uniformly.

Therefore, when the electrophoretic display element of the first embodiment is driven in light, the portions of the mesh-like transparent partition member 3 where the partitions 30 at each end are present, the boundary portions between the partitions 30 at each end, and It is possible to reduce the difference in color and amount of light shielding between the part where each other end side compartment 31 exists and the boundary part between each other end compartment 31 and make it almost uniform, so that the appearance can be improved. Partial transmission of incident light can be prevented. Even in the case of an electrophoretic display element including the mesh-like transparent partition member 3, the appearance can be improved when the electrophoretic display element is driven to transmit light.

[0030] The values of the frequency and voltage used in this example are, for example, a frequency of 50 to 1000 Hz and a voltage of 1
It can be used by changing within the range of 00 to 300V. Furthermore, even if the frequency and voltage values are higher than the above ranges, the effects on the electrophoretic particles 8 will not change;
When it is low, the moving speed of the electrophoretic particles 8 decreases, and the contrast between light and dark deteriorates.

Further, the electrophoretic display element of this embodiment is operated at 100 VDC by using the first transparent electrode 2a and the second transparent electrode 2b as positive electrodes and the third transparent electrode 4 as a negative electrode from the time of driving with the alternating current voltage applied. When switched during driving with a DC voltage applied, negatively charged electrophoretic particles 8 in the dispersion medium 7
is attracted by the electrical adsorption force of the first transparent electrode 2a and the second transparent electrode 2b, quickly moves to the position shown in FIG. 2, and adheres along the first transparent electrode 2a and the second transparent electrode 2b. As a result, the state in which the light-shielding electrophoretic particles 8 are dispersed in the light-transmitting dispersion medium 7 is actively eliminated, so that the light incident from the first transparent substrate 1a side or the second transparent substrate 1b side is The light passes through the dispersion medium 7 of the - end side compartment 30 and the plurality of other end side compartments 31, and a light-transmitting state of the element is obtained.

Further, according to the electrophoretic display element of this embodiment, even when a large-sized display element is used, the electrophoretic particles 8 in the dispersion medium 7 are separated by a plurality of -
Since the movement occurs in a small area for each of the end-side compartment 30 and the plurality of other-end compartments 31, the moving distance is extremely small, and the electrophoretic particles 8 are prevented from agglomerating, and the switching between the two drives is possible. It is possible to clearly and quickly display brightness and darkness at different times. In addition, although the specific gravity of the electrophoretic particles 8 is larger than the specific gravity of the dispersion medium 7 in the above example, the specific gravity of the electrophoretic particles 8 is higher than that of the dispersion medium 7. A material with a specific gravity smaller than that can be used. In this case, except that when the electrophoretic particles 8 are not driven, the electrophoretic particles 8 float and adhere within the small areas of each of the plurality of end-side compartments 30 and the plurality of other-end-side compartments 31, respectively. The action and effect are the same as that of (Second Example) The electrophoretic display element of the second example is
Linear first transparent electrode 2a and second transparent electrode 2 of the example
As shown in FIGS. 6 and 7, the first transparent electrode 2c and the second transparent electrode 2d having a planar shape are used instead of the electrode 2b, and the other end surface 3b side of the transparent partition member 3 of the first embodiment is Vertical inner bottom part 302 of one end side compartment 30 facing each other and vertical inner bottom part 31 of the other end side compartment 31 facing the - end surface 3a side
As shown in FIGS. 6 and 7, instead of the third transparent electrode 4, a rectangular inner circumferential wall 300 forming a plurality of compartments 30 at one end of the transparent compartment member 3
Except for using the third transparent electrode 4A formed in a planar shape on the lower horizontal surface 303 of and the lower horizontal surface 313 of the quadrangular inner circumferential wall 310 forming the plurality of other end side compartments 31. The structure and operation and effect of the first embodiment are the same. (Third Embodiment) In the electrophoretic display element of the third embodiment, as shown in FIG. 8 projected on the front side and FIG. 9 projected on the back side, the mesh transparent partition member 3A has one end A side compartment 30A and a plurality of other end compartments 31A
The peripheral wall portion 300 has an equilateral triangular bottomed hole (concave portion) that forms a
The configuration and operation and effects of the first embodiment are the same as those of the first embodiment, except that the second embodiment is formed by a circumferential wall portion 310a having an inverted equilateral triangular shape.

[Brief explanation of the drawing]

FIG. 1 shows that the electrophoretic display element of the first embodiment is in a driving state where an alternating current voltage is applied, and electrophoretic particles are dispersed in a dispersion medium in a plurality of compartments on the negative end side and a compartment on the other end side. FIG. 3 is a vertical cross-sectional view showing a case where the light is in a dimming state.

[Fig. 2] The electrophoretic display element of the first embodiment is in a driving state with a DC voltage applied, and electrophoretic particles are attracted to the third transparent electrode of the plurality of -end side compartments and the plurality of other end side compartments. FIG.

FIG. 3 is a front view showing the mesh-like transparent partition member in the first embodiment projected on its front side.

FIG. 4 is a rear view showing the mesh-like transparent partition member in the first embodiment projected onto its back side.

5 is a perspective view showing a cross section taken along line A-A in FIG. 3; FIG.

FIG. 6 shows that the electrophoretic display element of the second embodiment is in a driving state with an AC voltage applied, and electrophoretic particles are dispersed in the dispersion medium in the plurality of compartments on the negative end side and the compartments on the other end side. FIG. 3 is a vertical cross-sectional view showing a case where the light is in a dimming state.

FIG. 7: The electrophoretic display element of the second embodiment is in a driving state with a DC voltage applied, and electrophoretic particles are adsorbed to the third transparent electrode of the plurality of end-side compartments and the plurality of other-end compartments. FIG.

FIG. 8 is a front view showing a mesh-like transparent partition member in a third embodiment projected on the front side thereof.

FIG. 9 is a rear view showing the mesh-like transparent partition member in the third embodiment projected onto the rear side thereof.

FIG. 10 is a front view showing a conventional partition body projected on its front side.

11 is a sectional view taken along the line A1-A1 in FIG. 10. FIG.

12 is a sectional view taken along the line A2-A2 in FIG. 10. FIG.

[Explanation of symbols]

1a--first transparent substrate 1b
─Second transparent substrates 2a, 2c─First transparent electrode
2b, 2d--second transparent electrodes 3, 3A--mesh-like transparent partition member 3a--end surface
3b---Other end face 30---a plurality of end compartments
31 - Plural other end side compartments 300, 310 - Surrounding wall part 301, 311 - Opening part 3
02, 312—Vertical inner bottom portion 303, 313—Lower horizontal surface 4—Third transparent electrode 301 5a, 5c—First transparent insulating coat film 5b, 5d
─Second transparent insulation coat film 6─Space
7-Transparent dispersion medium 8-Light-shielding electrophoretic particles
90─AC power supply 93─DC power supply

Claims (1)

[Claims] 1. A first transparent substrate, a second transparent substrate disposed opposite to the first transparent substrate, a first transparent substrate and a second transparent substrate.
A transparent dispersion medium sealed in an enclosed space between a transparent substrate, light-shielding electrophoretic particles dispersed in the dispersion medium, and a striped or mesh-shaped transparent partition member interposed in the enclosed space. and at least the first transparent substrate and the second transparent substrate.
a transparent substrate, one of the striped or mesh-like transparent partition members, and a first one formed on the other one;
An electrophoretic display element comprising a transparent electrode and a second transparent electrode, and configured such that an AC voltage or a DC voltage is applied to the first transparent electrode and the second transparent electrode,
The stripe-shaped or mesh-shaped transparent partition member has a plurality of openings that are spaced apart from each other in a direction perpendicular to the thickness direction on the end face side and the other end face side facing the first transparent substrate and the second transparent substrate, respectively. -Has an end compartment and a plurality of other end compartments, and when projected in the viewing direction, either the end compartment or the other end compartment exists over the entire surface of the enclosed space. An electrophoretic display element characterized in that it is configured so that there is no portion that does not overlap.