JP2011257607A - Manufacturing method and manufacturing apparatus of information display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information display panel which has excellent display quality and prevents a streak-like display defect on a display image.SOLUTION: In the manufacturing method of an information display panel, a particle group charged and sealed as a display medium in a cell formed by partition walls between two substrates at least one of which is transparent, and the particle group is moved to display information. The manufacturing method comprises: a step to arrange a mask having an opening corresponding to the cell on the partition wall when charging the particle group; a step to place the particle group on the mask; and a step in which a particle moving member having a rotational roller, at least around which materials with 50°-70° of JIS-A hardness are arranged, is allowed to be rotationally moved with the rotational roller pressed to the traveling direction of the particle moving member and thereby charging the particle group into the cell.

Description

  The present invention relates to a method and an apparatus for manufacturing an information display panel, and particularly to improve display quality in an information display panel.

Conventionally, as a method for manufacturing an information display panel, as shown in FIG. 4A, when the particle group 3 as a display medium is filled in the cell 7, a screen 14 is disposed on the partition wall 4. The particle group 3 is placed on the squeegee, and the squeegee 19 made of a plate-like rubber material is moved from one end of the screen 14 to the other end while being in contact with the screen 14. A method of filling the inside is disclosed (for example, Patent Document 1).
Usually, as the screen 14, a mesh type screen having a uniform mesh shape as a whole or a mask type screen in which a portion corresponding to the partition wall 4 is masked and a portion corresponding to the cell 7 is opened is used.

JP 2007-148381 A

When the particle group 3 is filled in the cell 7 using the conventional squeegee 19 described above, the squeegee 19 needs to be strongly pressed against the screen 14 (usually a pressing force of about 0.05 MPa to 20 MPa). And the screen 14 were rubbed strongly and damaged. In the particle drive type information display panel in which the damaged particles are filled in the cells 7 as described above, there is a problem in that the drive quality of the particles is inferior and the display quality is deteriorated such as a decrease in contrast. .
Furthermore, damaged particles tend to aggregate and form aggregates on the screen 14 easily. Although this aggregate may remain on the screen 14, if the squeegee 19 is moved in this state, there is a possibility that the squeegee 19 may have wrinkles 17 as shown in FIG. When particles are filled using the squeegee 19 with the ridges 17 as described above, the pressing force does not act on the ridge 17 portions of the squeegee 19 so that the particles are not filled and the display image has stripe-like unevenness. Had occurred.
Furthermore, the fact that the squeegee 19 is hard is one of the factors that cause the squeegee 19 to be easily wrinkled. As in the above-described example, when particles are filled using a squeegee with a heel, the manufactured information display can be used. A streak-like display defect occurs in the display image on the panel.

  The present invention solves the above-described problems, and advantageously avoids breakage of particles at the time of filling into a cell and generation of wrinkles that have occurred in a particle moving member called a conventional squeegee. It is an object of the present invention to provide an information display panel manufacturing method and manufacturing apparatus that eliminates the concern about the decrease in contrast and the occurrence of streak-like display defects.

  In the method for manufacturing an information display panel according to the present invention, a cell formed by a partition wall between two substrates, at least one of which is transparent, is filled as a display medium, and the enclosed particles are moved to display information. A method for manufacturing an information display panel, in which when a particle group is filled, a step of placing a mask having an opening corresponding to a cell on a partition, a step of placing the particle group on the mask, and JIS-A A particle moving member including a rotating roller having a material having a hardness of 50 ° to 70 ° arranged around at least the periphery is rotated while pressing the rotating roller in the traveling direction of the particle moving member, thereby moving the particle group in the cell. And a step of filling.

  In addition, in this invention, JIS-A hardness is a type A hardness prescribed | regulated by JISK6253, and can be measured with the durometer GS-719G made from a TECLOCK. Moreover, it corresponds to the Shore A hardness in ASTM.

  In the method for manufacturing an information display panel according to the present invention, the force for pressing the rotary roller against the mask surface is 1 MPa to 20 MPa, and the JIS-A hardness disposed at least around the rotary roller is 0 ° to 70 °. The material is preferably an elastic material.

  The apparatus for manufacturing an information display panel according to the present invention fills a cell formed by a partition wall between two substrates, at least one of which is transparent, as a display medium, and moves the enclosed particles to display information. An apparatus for manufacturing an information display panel, comprising: a mask disposed on a partition wall having an opening corresponding to a cell; and a rotary roller having a material having a JIS-A hardness of 50 ° to 70 ° arranged at least around the periphery. And a particle moving member.

  In the information display panel manufacturing apparatus of the present invention, it is preferable that the material having a JIS-A hardness of 50 ° to 70 ° disposed at least around the rotary roller is an elastic material.

  According to the present invention, it is possible to obtain an information display panel that is free from streak-like display defects and excellent in display quality.

It is a figure for demonstrating the charged particle in-air drive type information display panel which is an example of the information display panel used as the object of this invention. It is a figure for demonstrating an example of the filling procedure of the particle group according to this invention. It is a figure which shows the modification of the particle moving member used for this invention. It is a figure for demonstrating the filling procedure of the particle group according to a conventional method.

Hereinafter, the present invention will be specifically described.
First, a basic configuration of a charged particle driving type information display panel which is an example of an information display panel which is an object of the present invention will be described. In this information display panel, an electric field is applied from a counter counter electrode to a display medium configured as a particle group including charged particles sealed between opposing substrates. Along with the applied electric field direction, the display medium is attracted by an electric field force or a Coulomb force, and the moving direction of the display medium is switched by a change in the electric field direction, whereby information such as an image is displayed. Therefore, it is necessary to design the information display panel so that the display medium can move uniformly and maintain the stability when the display information is rewritten or when the displayed information is continuously displayed. Here, as the force applied to the particles constituting the display medium, in addition to the force attracting each other by the Coulomb force between the particles, an electric mirror image force with an electrode or a substrate, an intermolecular force, a liquid cross-linking force, gravity and the like can be considered.

An example of a charged particle driving type information display panel which is an object of the present invention will be described with reference to FIGS.
In the example shown in FIGS. 1A and 1B, at least two types of display media (in this case, negatively charged white particles 3Wa are included) configured as a particle group including particles having optical reflectance and chargeability. A white display medium 3W configured as a particle group and a black display medium 3B configured as a particle group including positively-charged black particles 3Ba are provided on the panel substrate 1 in each cell 7 formed of the partition walls 4. An electric field generated by applying a voltage between a pair of pixel electrodes formed by the electrode 5 (stripe electrode) and the transparent electrode 6 (stripe electrode) provided on the transparent panel substrate 2 on the observation side opposite to each other at right angles. Accordingly, the substrate is moved perpendicularly to the substrates 1 and 2. Then, the white display medium 3W is visually recognized by the observer as shown in FIG. 1A, or the white display is displayed by the observer, or the black display medium 3B is visually recognized by the observer as shown in FIG. Is displayed in a matrix with black and white dots. In addition, in FIG. 1 (a), (b), the partition in front of drawing is abbreviate | omitted. Here, an example is shown in which cells and pixels (dots) have a one-to-one correspondence. The partition 4 and the substrate 1 are bonded via an adhesive 8.

A suitable filling method of the particle group in the cell according to the present invention will be described with reference to FIG. FIG. 2A shows a state in which a cell is filled with a particle group as a display medium, and FIG. 2B shows a configuration of a particle moving member used at that time.
In the method for manufacturing an information display panel of the present invention, as shown in FIG. 2A, a mask 15 having an opening corresponding to a cell is disposed on a partition wall 4, and the particle group 3 is placed on the mask 15. By moving the particle moving member 20 a from one end to the other end of the mask 15 in contact with the mask 15, the particle group 3 is dropped from the opening of the mask 15 and filled into the cell 7.
Note that the mask 15 has a portion corresponding to the partition wall 4 masked and a portion corresponding to the cell 7 opened, and the opening of the mask is not larger than the opening of the cell.

In the present invention, it is important that the particle moving member 20a to be used includes the holder 21 and the rotary roller 22, and the JIS-A hardness of the rotary roller 22 in contact with the mask 15 is in the range of 50 ° to 70 °. is there. When the particle group 3 is filled into the cell 7 by the pressing force of the rotary roller 22 while pressing the rotary roller 22 against the mask 15, the rotary roller 22 is rotated in the direction of the arrow as shown in FIG. The mask 15 is moved in the right direction indicated by the arrow while being moved. The rotational direction of the rotary roller 22 and the traveling direction of the particle moving member 20a are moved on the mask 15 while pressing the rotary roller 22 against the mask 15 as indicated by arrows in FIG. The particles are not rubbed strongly by the rotary roller 22 and the mask 15, and the possibility that the particles are damaged is reduced. Therefore, display quality deterioration such as a decrease in contrast due to particle damage does not occur.
Damaged particles have a distorted shape rather than a spherical shape, and the surface area of the particles increases, so that they easily adhere to the substrate, electrodes, partition walls, and the like. Therefore, even if a predetermined voltage is applied between the substrates, the particles do not move and the contrast is lowered.

Further, in the present invention, since the rotary roller 22 is in contact with the mask surface, there is no problem that the damaged particles are aggregated and become wrinkled on the plate-like squeegee 19 as a result. No streak-like unevenness occurs in the display image of the information display panel.
However, when a material having a JIS-A hardness of about 90 ° is used as the material of the rotary roller 22, the rotary roller 22 is still wrinkled and streaks appear in the display image of the information display panel. Problem arises. Therefore, by setting the material hardness of the peripheral portion in contact with the mask 15 of the rotary roller 22 to 50 ° to 70 ° in terms of JIS-A hardness, wrinkles are less likely to occur in the rotary roller 22, and as a result, the manufactured information It was confirmed by an example described later that streak-like unevenness does not occur in the display image of the display panel.

  In the present invention, the force for pressing the rotary roller 22 against the mask 15 is preferably in the range of 1 MPa to 20 MPa. If it exceeds 20 MPa, the particles are damaged, and if it is less than 1 MPa, there is a possibility that sufficient particle movement cannot be performed. By setting the pressing force within the above range, the surface of the rotary roller 22 can bring the mask 15 and the partition into close contact.

FIG. 3 shows a modified example of the particle moving member having a pressing mechanism for pressing the rotary roller 22 against the mask 15. When a predetermined pressing force is applied from the particle moving member 20b in a state where the pressing force (pressing force) shown in FIG. 3A is not applied, the roller shaft 23 is attached as shown in FIG. 3B. The rubber elastic body 24 is compressed by the length L to transmit the pressing force to the powder fluid and the mask. FIG. 3C shows a side view of the particle moving member 20b.
As shown in FIG. 3D, a particle moving member 20c having a plate spring 25 as a pressing mechanism, and as shown in FIG. 3E, a particle moving member 20d having a coil spring 26 as a pressing mechanism can be used.
Such a pressing mechanism is preferably provided at both ends of the rotary roller 22, but can also be provided at either one.
Further, when the pressing mechanism is provided at both ends of the rotary roller 22, it is preferable to provide the same pressing mechanism.

  By adjusting the width W of the rotary roller 22 to the number and arrangement position of the information display areas of the information display panel, and by setting the roller length to be larger than the width for all the information display areas, This is preferable because it is possible to fill the information display area with a group of particles as a display medium. Further, when a plurality of information display panels are manufactured at the same time, for example, in the case of a four-sided arrangement in which the information display panels are arranged by 2 × 2, the width W of the rotary roller 22 is set to be equal to It is preferable that the width be larger than the width. In this case, for each of the two information display areas arranged side by side, it is possible to use a rotary roller in which two rollers wider than the width of the information display area are configured.

The diameter D of the rotary roller 22 is preferably 10 mm or more and 100 mm or less.
This is because, if it exceeds 100 mm, the rotary roller 22 becomes heavy, and it becomes difficult to move the rotary roller 22 at high speed, and the particle moving member including the moving mechanism becomes large, while 10 mm This is because the diameter of the rotary roller 22 is too small, and there is a possibility that the particle group deposited on the mask 15 cannot be moved efficiently.
The material to be disposed at least on the outer periphery of the rotary roller 22 is natural rubber, synthetic rubber such as urethane rubber, nitrile rubber, chloroprene rubber, fluoro rubber, polyethylene, polypropylene, polyurethane, nylon, polyvinyl chloride, and composites thereof. And a composite material of the above-described polymer material. These materials exhibit moderate elasticity at a JIS-A hardness of 50 ° to 70 °, and return to their original shape even when deformed by pressing, so that they are preferably used as materials constituting the rotary roller of the present invention.

Hereinafter, each member which comprises the information display panel used as the object of this invention is demonstrated.
As the substrate, at least one of the substrates is a transparent substrate from which the display medium can be confirmed from the outside of the panel, and a material having high visible light transmittance and good heat resistance is preferable. The back substrate as the other substrate may be transparent or opaque. Examples of substrate materials include organic polymer substrates such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (PE), polycarbonate (PC), polyimide (PI), polyethersulfone (PES), and acrylic. Alternatively, a glass sheet, a quartz sheet, a metal sheet coated with an insulating film, or the like is used, and a transparent one of them is used on the display surface side. The thickness of the substrate is preferably 2 μm to 2000 μm, more preferably 5 μm to 1000 μm. If it is too thin, it will be difficult to maintain the strength and the uniformity of the distance between the substrates, and if it is thicker than 2000 μm, a thin information display panel will be obtained. Inconvenient in case.

  Electrode forming materials include metals such as aluminum, silver, nickel, copper and gold, indium tin oxide (ITO), zinc doped indium oxide (IZO), aluminum doped zinc oxide (AZO), indium oxide, conductive oxide Conductive metal oxides such as tin, antimony tin oxide (ATO), and conductive zinc oxide, and conductive such as polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenedioxythiophene) -poly- (styrenesulfonate) (PEDOT: PSS) Ionic polymers are exemplified, and are appropriately selected and used. As a method for forming an electrode, a method of patterning and forming a metal foil (for example, a rolled copper foil) by laminating the above exemplified materials into a thin film by sputtering, vacuum vapor deposition, CVD (chemical vapor deposition), coating, or the like. A method or a method of patterning by mixing a conductive agent with a solvent or a synthetic resin binder and applying it is used. The electrode provided on the viewing side (display surface side) substrate needs to be transparent, but the electrode provided on the back side substrate does not need to be transparent. In any case, the above-mentioned material that is conductive and capable of pattern formation can be suitably used. The electrode thickness is determined in view of conductivity and light transmittance, and is 0.01 μm to 10 μm, preferably 0.05 μm to 5 μm. The material and thickness of the electrode provided on the back substrate need not be considered in light transmittance.

  In the present invention, the electrode serving as the connection electrode formed outside the information display screen region is a relatively brittle and easily broken electrode made of a conductive material, for example, on a conductive film such as a conductive metal oxide film. Furthermore, it has a laminated structure in which flexible conductive films such as the same are stacked, or a single-layer structure of a flexible conductive metal film. Examples of conductive metal oxide films include indium tin (ITO), indium oxide, zinc-doped indium oxide (IZO), aluminum-doped zinc oxide (AZO), antimony tin oxide (ATO), tin oxide, and zinc oxide. Although they are mentioned, all of them are less flexible and more brittle than metals. As the conductive material, conductive polymers such as polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenedioxythiophene) -poly- (styrenesulfonate) (PEDOT: PSS) can be used. In the case where the conductive film obtained by forming such a polymer material is less flexible than metal, a flexible conductive metal film is formed on the polymer material conductive film. It is preferable to adopt a laminated structure. Examples of the flexible conductive metal include gold, silver, copper, aluminum, nickel, chromium and the like and alloys containing these as main components.

The shape of the partition wall is appropriately set appropriately depending on the type of display medium involved in display, the shape and arrangement of electrodes to be arranged, and is not limited in general, but the width of the partition wall is 2 μm to 100 μm, preferably 3 μm to 50 μm. The height of the partition wall is adjusted to 10 μm to 500 μm, preferably 10 μm to 200 μm. The height of the partition wall arranged for securing the inter-substrate gap is matched with the inter-substrate gap to be secured. The height of the partition wall arranged to partition the inter-substrate space into cells may be the same as or lower than the inter-substrate gap.
In forming the partition wall, a both-rib method in which ribs are formed on each of the opposing substrates 1 and 2 and then bonded, and a single-rib method in which ribs are formed only on one substrate are conceivable. Any method is used in the present invention.
The cells formed by the partition walls made of these ribs are exemplified by a square shape, a triangular shape, a line shape, a circular shape, and a hexagonal shape when viewed from the substrate plane direction, and the arrangement is exemplified by a lattice shape, a honeycomb shape, or a mesh shape. The It is better to make the portion corresponding to the cross section of the partition wall visible from the display surface side (the area of the cell frame) as small as possible, and the display state becomes clearer.
Here, examples of the method for forming the partition include a mold transfer method, a mask printing method, a sand blast method, a photolithography method, and an additive method. Any of these methods can be suitably used for an information display panel mounted on the information display device of the present invention, and among these, a photolithography method using a resist film and a mold transfer method are suitably used.

  In the information display panel manufactured by the manufacturing apparatus of the present invention, the particle group constituting the display medium has an average particle diameter d (0.5) in the range of 1 μm to 20 μm, and may be composed of one type of particle or a plurality of types. Or a combination of particles. If the average particle diameter d (0.5) is larger than this range, the display is not clear. If the average particle diameter d (0.5) is smaller than this range, the cohesive force between the particles becomes too large, which hinders movement as a display medium.

Furthermore, regarding the particle size distribution of the particles (particle group) constituting the indicated medium, the particle size distribution Span represented by the following formula is set to less than 5, preferably less than 3.
Span = (d (0.9) −d (0.1)) / d (0.5)
(However, d (0.5) is a numerical value expressing the particle diameter in μm that 50% of the particles are larger than this and 50% is smaller than this, and d (0.1) is a particle in which the ratio of the smaller particles is 10%. (Numerical value expressed in μm, and d (0.9) is a numerical value expressed in μm for a particle diameter of 90% or less.)
By keeping Span within a range of 5 or less, the sizes of the particles constituting the display medium are uniform, and uniform movement as the display medium becomes possible.

  Furthermore, when using a plurality of particle groups as a display medium, among the used particle groups, the minimum average with respect to the average particle diameter d (0.5) of the particle group showing the maximum average particle diameter d (0.5) The ratio of the average particle diameter d (0.5) of the particle group showing the particle diameter d (0.5) is 10 or less. Even if the particle size distribution Span is reduced, the plurality of particle groups move in the opposite directions as the display medium, so that the particles having the smaller particle size can move easily as the display medium. This is preferable, and this is the range.

The particle size distribution and the particle size can be obtained from a laser diffraction / scattering method or the like. When laser light is irradiated onto particles to be measured, a light intensity distribution pattern of diffracted / scattered light is spatially generated, and this light intensity pattern has a corresponding relationship with the particle diameter, so that the particle diameter and particle diameter distribution can be measured. .
Here, the particle size and the particle size distribution are obtained from a volume-based distribution. Specifically, using a Mastersizer2000 (Malvern Instruments Ltd.) measuring instrument, a particle group was introduced into a nitrogen stream, and the attached analysis software (software based on volume reference distribution using Mie theory) The average particle size and particle size distribution can be measured.

In addition, when the particle group is driven in a gas (including vacuum) space as a display medium, it is important to manage the gas in the void surrounding the display medium between the panel substrates, improving display stability. Contribute to. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, preferably 50% RH or less with respect to the humidity of the gas in the void portion.
This gap portion is a so-called display in which the electrodes 5 and 6, the display media 3 </ b> B and 3 </ b> W occupied portions, the partition wall 4 occupied portions, and the panel substrate seal portion are excluded from the portions sandwiched between the opposing substrates 1 and 2. It shall refer to the gas part in contact with the medium.
The gas in the gap is not limited as long as it is in the humidity region described above, but dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, and the like are preferable. This gas must be sealed between the panel substrates so that the humidity is maintained. For example, the display medium is filled and the panel is assembled in a predetermined humidity environment. It is important to apply a sealing material and a sealing method to prevent intrusion.

The distance between the substrates in the information display panel targeted by the present invention is not limited as long as the display medium can be driven and the display contrast can be maintained. Usually, the display medium is 2 μm to 500 μm, preferably 5 μm to 200 μm. It is adjusted according to the size and the filling amount of the particles constituting the particle group.
In the case where chargeable particles are used for the particle group serving as the display medium, the distance between the substrates is adjusted in the range of 10 μm to 100 μm, preferably 10 μm to 50 μm. Further, the volume occupation ratio of the display medium in the gas space between the substrates is preferably 5% to 70%, more preferably 5% to 60%. When it exceeds 70%, the movement of particles as a display medium is hindered, and when it is less than 5%, the contrast tends to be unclear.

  Examples of the present invention will be described below, but the present invention is not limited thereto.

(Preparation of display medium)
In the information display panels of the inventive example and the comparative example, a black and white two-color display medium (particle group A, particle group B) having different charging characteristics was used as the display medium.
Particle group A consists of acrylic urethane resin EAU53B (manufactured by Asia Industry Co., Ltd.) / IPDI crosslinking agent Excel Hardener HX (manufactured by Asia Industry Co., Ltd.) and carbon black (MA100 Mitsubishi Chemical Corporation), 4 parts by weight, charge control. 2 parts by weight of the agent Bontron N07 (Orient Chemical Co., Ltd.) was added, kneaded, pulverized with a jet mill, and mechanical impact force was applied using a hybridizer device (Nara Machinery Co., Ltd.). In addition, classification was made after making it approximately spherical. The produced particle group A was an approximately spherical and negatively charged black particle group having an average particle diameter of 9.1 μm.
Particle group B was prepared by dissolving 0.5 parts by weight of AIBN (azobisisobutyronitrile) in 80 parts by weight of tertiary butyl methacrylate monomer and 20 parts by weight of 2- (diethylamino) ethyl methacrylate. The liquid obtained by dispersing 20 parts by weight of titanium oxide made lipophilic by treatment with an agent is suspended and polymerized in an aqueous solution of 0.5% surfactant (sodium lauryl sulfate), filtered, dried. Then, it was prepared using a classifier (MDS-2: Nippon Numatic Industries). The produced particle group B was a white particle group having an average particle diameter of 8.5 μm and a substantially spherical and positively charged property.

(Preparation of panel substrate)
Two glass transparent substrates with ITO electrodes were prepared, ribs having a height of 50 μm were formed on one substrate, and square-shaped and grid-shaped partition walls were formed. In addition, the board | substrate was set as the structure which acquires the information display panel of 4 surfaces by 2x2 arrangement | positioning.
The partition wall was formed as follows. A dry film photoresist NIT250 (thickness 50 μm) manufactured by Nichigo Morton, which is a photosensitive film, was laminated on a glass with ITO, and a partition wall having desired lines 30 μm, spaces 320 μm, and pitch 350 μm was formed by exposure and development. Thus, a partition wall having a height of 50 μm was obtained.

(Production of information display panel)
The particle group A and the particle group B were sequentially filled in the cell using different masks. As the mask, a stainless steel plate having a thickness of 80 μm provided with holes (openings) having a diameter of 100 μm corresponding to the cell positions was used. The area of the mask hole (opening) relative to the cell area was 7.6%.
First, the mask is placed on the partition wall of the substrate, the black particle group (particle group A) is placed on the mask, and various particle moving members are reciprocated twice on the mask to fill the cell with the black particle group. . Next, a mask on which the white particle group (particle group B) was placed was placed on the partition wall, and the particle moving member was similarly reciprocated three times to fill the cell with the white particle group. A panel capable of acquiring four information display panels was prepared by laminating a substrate filled with a black particle group and a white particle group in sequence with a counter substrate.
Here, a particle moving member having a structure and material as shown in Table 1 was used. The particle moving member used in the comparative example was a so-called squeegee made of urethane rubber and had a JIS-A hardness of 90 °.
Table 1 also shows the pressing force when pressing the rotary roller or squeegee against the mask.

(Evaluation of defective rate and panel display quality)
According to the above-described method of the present invention, 100 panels of each inventive example are continuously produced in a four-chamfer arrangement, and a test image is displayed on a total of 400 information display panels, 4 each, and the contrast of the image is adjusted. Measure and compare contrast changes. The contrast change is expressed by the contrast value of the last panel (100th panel) / contrast value of the first panel (first panel). Also, the contrast value is determined by applying a predetermined voltage to the information display panel to display black, measuring the luminance during black display, and then applying a predetermined voltage to the information display panel to display white. The brightness at the time of white display is measured and calculated from the measured brightness at the time of black display and brightness at the time of white display. Therefore, the closer the contrast change is to 1, the better the result is. The smaller the value is, the more continuously the information display panel is manufactured, the more the number of continuous images is increased, the lower the contrast is. Means that
Moreover, it was evaluated by the visual observation using an optical microscope whether the uneven stripes generate | occur | produced in 400 each invention example panel.
In the comparative example, the same measurement and evaluation were performed. The results are also shown in Table 1.

  From Table 1, it was confirmed that by using the rotary roller type particle moving member according to the present invention, a reduction in contrast was significantly improved and an information display panel free from stripes was obtained.

  According to the present invention, it is possible to provide an information display panel excellent in display quality in which a streak-like display defect does not occur in a display image.

DESCRIPTION OF SYMBOLS 1, 2 Panel substrate 3 Particle group 3W White display medium 3Wa White particle 4 Partition 5, 6 Stripe electrode 7 Cell 8 Adhesive 14 Screen 15 Mask 17 １９ 19 Squeegee 20 Particle moving member 22 Rotating roller 23 Roller shaft 24 Rubber elastic body 25 Leaf spring 26 Coil spring

Claims (5)

A method for producing an information display panel for displaying information by moving a sealed particle group filled as a display medium in a cell formed by a partition wall between two substrates, at least one of which is transparent, When filling the particles,
Disposing a mask having an opening corresponding to the cell on the partition;
Placing the particles on the mask;
By rotating and moving a particle moving member comprising a rotating roller having a material having a JIS-A hardness of 50 ° to 70 ° around at least the pressing roller in the traveling direction of the particle moving member, Filling the particles into the cell;
A method for manufacturing an information display panel, comprising:   2. The method for manufacturing an information display panel according to claim 1, wherein a force for pressing the rotary roller against the mask surface is 1 MPa to 20 MPa.   3. The method for manufacturing an information display panel according to claim 1, wherein the material having a JIS-A hardness of 50 [deg.] To 70 [deg.] Arranged at least around the rotary roller is an elastic material. An apparatus for manufacturing an information display panel that displays information by moving particles enclosed in a cell formed by a partition between two transparent substrates at least one of them and moving the enclosed particles.
A mask disposed on the partition wall and having an opening corresponding to the cell;
A particle moving member comprising a rotary roller having a material having a JIS-A hardness of 50 ° to 70 ° arranged at least around the periphery;
An apparatus for manufacturing an information display panel comprising: 5. The apparatus for manufacturing an information display panel according to claim 4, wherein the material having a JIS-A hardness of 50 [deg.] To 70 [deg.] Arranged at least around the rotary roller is an elastic material.

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