JP4881628B2 - Device and method for measuring the capacity of a display medium - Google Patents

Description

  According to the present invention, at least one of the substrates is a transparent opposing substrate, and the first substrate is superposed on the second substrate provided with a partition for forming a display medium storage cell on the surface, and the display medium is stored therebetween. The present invention relates to an information display panel manufacturing apparatus for manufacturing an information display panel having a structure to be sealed, and an information display panel manufacturing method using the same.

  Conventionally, before and after the display medium is filled, a substrate is placed on the electronic balance by a human hand or a supply robot, and the display medium fill weight is measured, so that the storage fill amount of the display medium approaches the desired storage fill amount next time. It has been proposed to perform feedback control on the supply amount of the display medium to be filled (see, for example, Patent Document 1).

JP 2005-257767 A

  When measuring the substrate weight with an electronic balance, an accurate measurement is required, and therefore a mechanism for vertically lowering the substrate from above the electronic balance is required while keeping the substrate horizontal. In addition, the substrate must be lowered to the electronic balance measurement unit and wait for a certain period of time until the weight value stabilizes. Further, a series of operations are required to raise the substrate after the measurement is completed, and time other than filling the display medium is required. As a result, production efficiency deteriorates.

  In addition, since an electronic balance measuring stage is required in addition to the display medium filling device, the size of the device is increased, resulting in expensive equipment. In addition, since the substrate comes into direct contact with the electronic balance, foreign matter may adhere to the bottom surface of the electronic balance if it is attached to the electronic balance. In the worst case, the substrate may be damaged. Sometimes.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an information display panel manufacturing apparatus and method that can produce an information display panel with good production efficiency and at a low cost, and that foreign matter does not adhere to the lower surface of the substrate. Is.

An apparatus for manufacturing an information display panel according to the present invention includes:
At least one of the substrates is a transparent opposing substrate, and the first substrate and a second substrate provided with a partition for forming a display medium storage cell on the surface are overlapped, and the display medium is stored and sealed between them. An information display panel manufacturing apparatus for manufacturing an information display panel having a structure to
The projector includes a projector that projects light toward the display medium stored in the display medium storage cell on the top surface of the substrate, and a receiver that receives light blocked by the display medium. It is characterized in that it is obtained from weight data converted from the quantity.

  Preferably, when the display medium is stored and filled in the display medium storage cell, the medium that transports the display medium in the display medium supply device is a gas, and the weight data is set to a converted voltage value.

  According to the present invention, an information display panel is manufactured by using the apparatus for manufacturing an information display panel of the present invention to obtain a storage filling amount of a display medium from weight data converted from a received light amount. The present invention also relates to a method for manufacturing an industrial panel.

  According to the present invention, light is projected toward the display medium stored in the display medium storage cell on the upper surface of the substrate, the light blocked by the display medium is received, and the storage filling amount of the display medium is determined by the received light amount. Obtained from weight data converted from. This saves time and effort on the electronic balance, thereby shortening the time and consequently improving production efficiency. Moreover, since a specific stage is not required unlike an electronic balance, the size of the apparatus can be reduced as a result, and a relatively inexpensive facility can be constructed. Furthermore, since the filling weight measurement can be performed without contact, foreign matter does not adhere to the lower surface of the substrate.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  First, the basic configuration of the information display panel of the present invention will be described. In the information display panel which is an object of the present invention, an electric field is applied to a display medium sealed between two opposing substrates. Along with the applied electric field direction, the charged display medium is attracted by the electric field force or Coulomb force, etc., and the moving direction of the display medium changes due to the change of the electric field direction due to the potential switching, thereby displaying information such as images. Made. Therefore, it is necessary to design the information display panel so that the display medium can move uniformly and maintain stability when rewriting the display repeatedly or when displaying the display information continuously. 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 between the electrode and the substrate, an intermolecular force, a liquid crosslinking force, gravity, and the like can be considered.

  An example of the information display panel of the present invention will be described with reference to FIGS.

  In the example shown in FIG. 1, at least two or more types of display medium 3 composed of at least one type of particles and different charging properties (here, white display consisting of particles of particles 3Wa for white display medium). The black display medium 3B, which is composed of a particle group of the medium 3W and the black display medium particles 3Ba, is moved in a direction perpendicular to the substrates 1 and 2 in accordance with the electric field applied from the outside of the substrates 1 and 2. 3B is visually recognized by the observer and black display is performed, or the white display medium 3W is visually recognized by the observer and white display is performed. In the example shown in FIG. 1, for example, a partition 4 is provided between the substrates 1 and 2 in a lattice form to form a cell, and the partition in front is omitted.

  In the example shown in FIG. 2, at least two or more types of display medium 3 composed of at least one type of particles and different charging properties (here, white display consisting of a group of particles 3Wa of white display medium particles 3Wa). The black display medium 3B including a particle group of the medium 3W and the black display medium particles 3Ba) is generated by applying a voltage between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2. Depending on the electric field, the substrate is moved perpendicularly to the substrates 1 and 2 and the black display medium 3B is visually recognized by the observer to display black, or the white display medium 3W is visually recognized by the observer and white display is performed. Is going. In the example shown in FIG. 2, for example, a partition 4 is provided in a lattice shape between the substrates 1 and 2 to form cells, and the partition in front is omitted.

  In the example shown in FIG. 3, a display medium 3 having at least an optical reflectance and a chargeability composed of at least one kind of particles (here, a white display medium 3 </ b> W composed of particles of white display medium particles 3 </ b> Wa is shown). ) Is moved in a direction parallel to the substrates 1 and 2 in accordance with the electric field generated by applying a voltage between the electrode 5 and the electrode 6 provided on the substrate 1, and the white display medium 3W is visually recognized by an observer. Thus, white display is performed, or the color of the electrode 6 or the substrate 1 is displayed by making an observer visually recognize the color of the electrode 6 or the substrate 1. In the example shown in FIG. 3, for example, a grid-like partition 4 is provided between the substrates 1 and 2 to form a cell, and the partition in front is omitted.

  The above description applies in the same manner to the case where the white display medium 3W including the particle group is replaced with the white medium including the powder fluid and the black display medium 3B including the particle group is replaced with the black display medium including the powder fluid. I can do it. The powder fluid will be described later.

Hereinafter, an apparatus for manufacturing an information display panel, which is a feature of the present invention, will be described in detail.
The information display panel manufacturing apparatus of the present invention has a function of controlling the supply amount of the display medium to be stored and filled in the display medium storage cells formed on the substrates 11a and 11b as shown in FIG. 4 to a desired supply amount. And includes a light projector 12 and a light receiver 13 and a light source / light reception amount display unit 14 for capturing the amount of storage and filling of the display medium supplied on the substrates 11a and 11b as the amount of light received. The measured amount of received light is converted into weight data, a data converter 15, a supply box 16 that transports and supplies the display medium via gas (in this case, air), and a supply box 16 via a transport pipe 17. A supply amount control unit 19 for controlling the supply amount of the display medium to be filled in the substrate 11 in the filling tank from the supply nozzle 18 and the supply box 16 which are connected and project from the supply box 16 through the transport pipe 17 and the supply nozzle 18 and data. Conversion / hold operation unit 20 The data holding operation 20 for holding and calculating the weight data transferred from the device and the supply amount data of the display medium supplied by the supply amount measuring unit 19, the substrate supply unit 21 for supplying the substrate, and the substrates 11a and 11b in the filling tank A substrate transfer robot 21 is provided for transferring the substrate. In the figure, the projector 12 and the light receiver 13 are installed in a substrate transfer robot 22.

  The apparatus for manufacturing an information display panel may use a device including a light projecting / receiving unit 31 that receives light reflected by a display medium as shown in FIG. The light source used when measuring the amount of received light is preferably a semiconductor laser or a red, green, and blue light emitting diode. When laser light is used, the wavelength is preferably about 650 nm to 800 nm.

  When light reception measurement from a white display medium is performed using laser light, the distance between the projector 32 and the light receiver 33 is set at a recommended detection distance (A) determined for each device to be used as shown in FIG. It is desirable to install 34 in the middle part (B = A / 2). In addition, when using an integrated light emitting / receiving device as shown in FIG. 7, the distance from the light emitting / receiving device 35 to the back of the substrate is larger than the detectable distance (C) determined for each device to be used. The distance to the substrate 36 needs to be set at the recommended detection distance (A) of the device. As shown in FIG. 8, when the distance from the substrate to the back surface cannot be larger than the detectable distance (C) due to the configuration of the apparatus, the recommended detection determined for each device using the distance from the light receiver / receiver 37 to the substrate 38. It is desirable to install it at a distance (A) and make the paint color on the back of the substrate different, or paste a black board or paper to absorb the reflection of light.

  Further, when measuring the light reception from the black display medium, the distance between the projector 39 and the light receiver 40 is set to the recommended detection distance (A) determined for each device as in the case of the light reception measurement from the white display medium as shown in FIG. However, it is desirable that the substrate 41 be installed at substantially the middle part (B = A / 2). Also, when using a light emitting and receiving integrated device as shown in FIG. 10, install the distance from the device to the back of the board within the recommended detection distance (A) of the equipment, and make the paint color on the back of the board white. It is desirable to affix a white board or paper to amplify the amount of reflected light.

  In FIG. 4, the substrate 11 c taken out from the substrate supply unit 21 by the substrate transport robot 22 measures the amount of received light and then puts it into the filling tank. When the substrate transport robot 22 takes out the substrate 11c from the filling tank after the display medium is supplied, the robot 22 is stopped at a predetermined position, and light is emitted toward the display medium on the substrate. Light received by the display medium is received by the light receiver 13 and the received light amount is displayed on the received light amount display unit 14. The received light amount is converted as a voltage value from the received light amount display unit 14, transferred to the data conversion unit 15, and converted into weight data by the data conversion unit 15.

  In FIG. 5, when the substrate is taken out from the filling tank by the substrate transfer robot 22 after the display medium is supplied, the robot is stopped at a predetermined position, and light is emitted toward the display medium on the substrate. For example, in the case of a white display medium, the emitted light is reflected by the white display medium and received by the light projector / receiver 31 as reflected light. As the amount of white display medium supplied increases, the amount of received light increases, and the relationship between the amount of received light and the amount of white display medium supplied is as shown in FIG. 11. Therefore, the amount of white display medium supplied can be obtained from the amount of received light. it can.

  In the case of a black display medium, the emitted light is absorbed by the black display medium, and the reflected light attenuates in inverse proportion to the supply amount of the black display medium. Since the relationship between the amount of received light and the supply amount of the black display medium is as shown in FIG. 12, the supply amount of the black display medium can be obtained from the amount of received light.

  In addition, the above-mentioned received light amount measurement is performed when a white display medium and a black display medium are used as display media to be supplied, and a white display medium storage filling process and a black display medium storage filling process are separately performed. Storage that is applied to the storage and filling process. When white display medium and black display medium are used as display media to be stored and filled, the storage and filling process of the white display medium and the storage and filling process of the black display medium are performed simultaneously. It can also be applied to the filling process. The two color combinations of the white display medium and the black display medium have been described so far. However, the two colors are not limited to white and black, and may be any combination of different colors, in other words, a combination having different optical reflectances. .

  Hereinafter, each member which comprises the information display panel used as the object of this invention is demonstrated.

  Regarding the substrate, at least one of the substrates is a transparent substrate capable of confirming the color of the display medium from the outside of the information display panel, and a material having high visible light transmittance and good heat resistance is preferable. The substrate 1 may be transparent or opaque. Examples of substrate materials include polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, flexible materials such as metal sheets, and glass and quartz. An inorganic sheet having no flexibility is mentioned. The thickness of the substrate is preferably 2 to 5000 μm, more preferably 5 to 700 μm. If it is too thin, it will be difficult to maintain the strength and the uniform spacing between the substrates, and if it is thicker than 5000 μm, the information display panel will be thinned. Inconvenient in case.

  As for the electrodes 5 and 6 in the case where electrodes are provided on the substrate, the electrode 6 provided on the substrate 2 side that needs to be transparent on the viewing side is formed of a conductive material that is transparent and can be patterned. Examples thereof include metals such as indium tin oxide (ITO), indium oxide, aluminum, gold, silver, and copper, and conductive polymers such as polyaniline, polypyrrole, and polythiophene. Examples of the forming method include vacuum deposition and coating. Note that the electrode thickness is not particularly limited as long as the conductivity can be secured and the light transmittance is not hindered, and is preferably 3 to 1000 nm, preferably 5 to 400 nm. The material and thickness of the electrode 5 provided on the substrate 1 side are the same as those of the electrode 6 described above, but need not be transparent. In this case, the external voltage input may be superimposed with direct current or alternating current.

  The shape of the partition 4 is optimally set according to the type of display medium involved in the display and is not limited in general. However, the width of the partition is 2 to 100 μm, preferably 3 to 50 μm, and the height of the partition is 10 to 10 μm. The thickness is adjusted to 5000 μm, preferably 10 to 200 μm. In forming the partition walls, a both-rib method in which ribs are formed on each of the opposing substrates and then bonded, and a one-rib method in which ribs are formed only on one substrate are conceivable. In the present invention, any method is preferably used.

  As shown in FIG. 7, the display medium storage cell formed by the partition walls made of these ribs is exemplified by a square shape, a triangular shape, a line shape, a circular shape, and a hexagonal shape as viewed from the substrate plane direction. And honeycomb shapes are exemplified. It is better to make the portion corresponding to the partition wall cross-sectional portion visible from the display side (the area of the frame portion of the display medium storage cell) as small as possible, and the clearness of the display state increases. Here, examples of the method for forming the partition include a screen printing method, a sand blasting method, a photolithography method, and an additive method. Of these, the photolithography method using a resist film is preferably used.

  Next, display medium colored particles (hereinafter also referred to as particles) constituting the display medium in the information display panel of the present invention will be described. The colored particles for the display medium are composed of the colored particles for the display medium as they are to be used as the display medium, or are combined with other particles to be used as the display medium, or are adjusted, configured to be a powdered fluid, and displayed. It is used as a medium. The powder fluid will be described later. The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, if necessary, in the resin as the main component, as in the conventional case. Examples of resins, charge control agents, colorants, and other additives will be given below.

  Examples of the resin include urethane resin, urea resin, acrylic resin, polyester resin, acrylic urethane resin, acrylic urethane silicone resin, acrylic urethane fluororesin, acrylic fluororesin, silicone resin, acrylic silicone resin, epoxy resin, polystyrene resin, styrene Acrylic resin, polyolefin resin, butyral resin, vinylidene chloride resin, melamine resin, phenol resin, fluororesin, polycarbonate resin, polysulfone resin, polyether resin, polyamide resin and the like can be mentioned, and two or more kinds can be mixed. In particular, acrylic urethane resin, acrylic silicone resin, acrylic fluororesin, acrylic urethane silicone resin, acrylic urethane fluororesin, fluororesin, and silicone resin are suitable from the viewpoint of controlling the adhesive force with the substrate.

  The charge control agent is not particularly limited. Examples of the negative charge control agent include salicylic acid metal complexes, metal-containing azo dyes, metal-containing oil-soluble dyes (including metal ions and metal atoms), and quaternary ammonium salt systems. Examples thereof include compounds, calixarene compounds, boron-containing compounds (benzyl acid boron complexes), and nitroimidazole derivatives. Examples of the positive charge control agent include nigrosine dyes, triphenylmethane compounds, quaternary ammonium salt compounds, polyamine resins, imidazole derivatives, and the like. In addition, metal oxides such as ultrafine silica, ultrafine titanium oxide, ultrafine alumina, nitrogen-containing cyclic compounds such as pyridine and derivatives and salts thereof, various organic pigments, resins containing fluorine, chlorine, nitrogen, etc. are also charged. It can also be used as a control agent.

  As the colorant, various organic or inorganic pigments and dyes as exemplified below can be used.

Examples of the black colorant include carbon black, copper oxide, manganese dioxide, aniline black, activated carbon and the like.
Examples of blue colorants include C.I. I. Pigment brie 15: 3, C.I. I. Pigment Blue 15, Bituminous Blue, Cobalt Blue, Alkaline Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Metal-free Phthalocyanine Blue, Phthalocyanine Blue Partial Chlorides, Fast Sky Blue, Indanthrene Blue BC and the like.
Examples of red colorants include bengara, cadmium red, red lead, mercury sulfide, cadmium, permanent red 4R, resol red, pyrazolone red, watching red, calcium salt, lake red D, brilliant carmine 6B, eosin lake, rhodamine lake B, Alizarin Lake, Brilliant Carmine 3B, C.I. I. Pigment Red 2 etc.

As yellow colorants, yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral first yellow, nickel titanium yellow, navel yellow, naphthol yellow S, Hansa Yellow G, Hansa Yellow 10G, Benzidine Yellow G, Benzidine Yellow GR, Quinoline Yellow Lake, Permanent Yellow NCG, Tartrazine Lake, C.I. I. Pigment Yellow 12 etc.
Examples of green colorants include chrome green, chromium oxide, pigment green B, C.I. I. Pigment Green 7, Malachite Green Lake, Final Yellow Green G, etc.
Examples of the orange colorant include red yellow lead, molybdenum orange, permanent orange GTR, pyrazolone orange, Vulcan orange, Indanthrene Brilliant Orange RK, Benzidine Orange G, Indanthren Brilliant Orange GK, C.I. I. Pigment Orange 31 etc.
Examples of purple colorants include manganese purple, first violet B, and methyl violet lake.
Examples of white colorants include zinc white, titanium oxide, antimony white, and zinc sulfide.

  Examples of extender pigments include barite powder, barium carbonate, clay, silica, white carbon, talc, and alumina white. Examples of various dyes such as basic, acidic, disperse, and direct dyes include nigrosine, methylene blue, rose bengal, quinoline yellow, and ultramarine blue.

Examples of inorganic additives include titanium oxide, zinc white, zinc sulfide, antimony oxide, calcium carbonate, lead white, talc, silica, calcium silicate, alumina white, cadmium yellow, cadmium red, cadmium orange, titanium yellow, Examples include bitumen, ultramarine blue, cobalt blue, cobalt green, cobalt violet, iron oxide, carbon black, manganese ferrite black, cobalt ferrite black, copper powder, and aluminum powder.
These pigments and inorganic additives can be used alone or in combination. Of these, carbon black is particularly preferable as the black pigment, and titanium oxide is preferable as the white pigment.

  The particles used in the present invention preferably have an average particle diameter d (0.5) in the range of 1 to 20 μm and are uniform and uniform. 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, in the present invention, regarding the particle size distribution of the particles constituting the display medium, the particle size distribution Span represented by the following formula is 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 expressed in μm that the particle size is 50% larger than this and 50% smaller than this, and d (0.1) is a particle whose proportion of particles below this is 10%. (Numerical value expressed in μm, d (0.9) is a numerical value expressed in μm for a particle size of 90% or less)
By keeping Span within a range of 5 or less, the size of each particle is uniform, and movement as a uniform display medium becomes possible.

  Furthermore, regarding the correlation between the particles, the ratio of d (0.5) of the particles having the minimum diameter to d (0.5) of the particles having the maximum diameter among the used particles is set to 50 or less, preferably 10 or less. It is essential. Even if the particle size distribution Span is reduced, particles with different charging characteristics move in opposite directions, so that the particle size is close to each other and each particle can be easily moved in the opposite direction by the equivalent amount. This is within this 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 particle size distribution in the present invention are obtained from a volume-based distribution. Specifically, using a Mastersizer2000 (Malvern Instruments Ltd.) measuring instrument, the particles are put into a nitrogen stream and the attached analysis software (software based on volume-based distribution using Mie theory) The diameter and particle size distribution can be measured.

  The charge amount of colored particles for display media naturally depends on the measurement conditions, but the charge amount of particles in the information display panel is almost the initial charge amount, contact with the partition, contact with the substrate, charge decay with elapsed time In particular, it was found that the saturation value of the charging behavior of colored particles for display media is a dominant factor.

  As a result of intensive studies, the present inventors evaluated the range of the appropriate charging characteristic value of the colored particles for display medium by measuring the charge amount of the colored particles for display medium using the same carrier particles in the blow-off method. I found out that I can do it.

  Although the measurement method will be described in detail later, the charge amount per unit weight of the particles can be measured by sufficiently bringing the display medium and carrier particles into contact with each other by the blow-off method and measuring the saturation charge amount. The charge amount of the display medium can be calculated by separately obtaining the average particle size and specific gravity of the particles constituting the display medium.

Next, the powder fluid used in the information display panel that is the subject of the present invention will be described.
The “powder fluid” in the present invention is a substance in an intermediate state of both fluid and particle characteristics that exhibits fluidity by itself without borrowing the force of gas or liquid. For example, liquid crystal is defined as an intermediate phase between a liquid and a solid, and has fluidity that is a characteristic of liquid and anisotropy (optical properties) that is a characteristic of solid (Heibonsha: Encyclopedia) . On the other hand, the definition of particle is an object with a finite mass even if it is negligible, and is said to be affected by gravity (Maruzen: Physics Encyclopedia). Here, even in the case of particles, there are special states of gas-solid fluidized bed and liquid-solid fluids. When gas is flowed from the bottom plate to the particles, upward force is applied to the particles according to the velocity of the gas. Is a gas-solid fluidized bed that is in a state where it can easily flow when it balances with gravity, and it is also called a liquid-solid fluidized state that is fluidized by a fluid (ordinary) Company: Encyclopedia). As described above, the gas-solid fluidized bed body and the liquid-solid fluid are in a state of using a gas or liquid flow. In the present invention, it has been found that a substance in a state of fluidity can be produced specifically without borrowing the force of such gas and liquid, and this is defined as powder fluid.

  That is, the pulverulent fluid in the present invention is in an intermediate state having both the characteristics of particles and liquid, as in the definition of liquid crystal (liquid and solid intermediate phase), and is the characteristic of the above-mentioned particles. It is a substance that is extremely unaffected and exhibits a unique state with high fluidity. Such a substance can be obtained in an aerosol state, that is, in a dispersion system in which a solid or liquid substance is stably suspended as a dispersoid in a gas, and the solid substance is regarded as a dispersoid in the information display panel of the present invention. To do.

An information display panel that is an object of the present invention is a powder fluid that exhibits high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, between gases, at least one of which is transparent. Such powder fluid can be easily and stably moved by a Coulomb force or the like with a small electric field force.
As described above, the pulverized fluid used in the present invention is a substance in the intermediate state of both fluid and particle characteristics that exhibits fluidity by itself without borrowing the force of gas or liquid. This powder fluid can be in an aerosol state in particular, and in the information display panel of the present invention, a solid substance is used in a state of relatively stably floating as a dispersoid in the gas.

Furthermore, in the present invention, it is important to manage the gas in the gap surrounding the display medium between the substrates, which contributes to improved display stability. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, and preferably 50% RH or less for the humidity of the gas in the gap.
1 to 3, electrodes 5 and 6 (when electrodes are provided inside the substrate), the occupied area of the display medium 3, and the partition walls 4 from the portion sandwiched between the opposing substrates 1 and 2 in FIGS. The gas portion that is in contact with the so-called display medium excluding the occupied portion and the seal portion (not shown) of the information display panel.
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 needs to be sealed in an information display panel so that the humidity is maintained, for example, filling a display medium, assembling an information display panel, etc. in a predetermined humidity environment, It is important to apply a sealing material and a sealing method that prevent moisture from entering from the outside.

The distance between the substrates in the information display panel of the present invention is not limited as long as the display medium can be moved and the contrast can be maintained, but is usually adjusted to 5 to 5000 μm, preferably 10 to 500 μm.
The volume occupation ratio of the display medium in the space between the opposing substrates is preferably 5 to 70%, more preferably 5 to 60%. If it exceeds 70%, the movement of the display medium is hindered, and if it is less than 5%, the contrast tends to be unclear.

  The present invention is a light receiver installed on the lower surface of the substrate by projecting light from the projector installed on the upper surface of the substrate using the reflection / absorption characteristics with respect to the color of light toward the display medium stored and filled on the upper surface of the substrate. It is characterized by receiving the shielded light and knowing the weight of the display medium contained and filled from the received light quantity. According to the present invention, it is possible to reduce the time because it is unnecessary to place the electronic balance on the electronic balance, and as a result, production efficiency is improved. Further, it is characterized in that the weight of the display medium filled and stored can be measured in a non-contact manner. Further, since a specific stage is not required unlike an electronic balance, the apparatus size can be reduced as a result, and a relatively inexpensive facility can be constructed.

  In addition, although the measurement of the display medium of white or black was demonstrated, this invention is applicable also to the measurement of the display medium of other arbitrary colors.

  The information display panel manufactured using the information display panel manufacturing apparatus of the present invention has no image unevenness, and is a display unit of a mobile device such as a notebook computer, PDA, mobile phone, handy terminal, electronic book, electronic newspaper, etc. Electronic paper, billboards, posters, blackboards, calculators, home appliances, automotive supplies, display units, point cards, IC cards, etc., electronic advertisements, information boards, electronic POP (Point Of Presence, Point Of Purchase advertising), electronic price tag, electronic score, display unit of RF-ID equipment, and the like.

It is a figure which shows an example of the drive method in the information display panel manufactured using the manufacturing apparatus of the information display panel of this invention. It is a figure which shows the other example of the drive method in the information display panel manufactured using the manufacturing apparatus of the information display panel of this invention. It is a figure which shows an example of the structure of the information display panel manufactured using the manufacturing apparatus of the information display panel of this invention. It is a figure which shows the structure of an example of the manufacturing apparatus of the information display panel of this invention. It is a figure which shows the structure of the other example of the manufacturing apparatus of the information display panel of this invention. It is a figure which shows the 1st example of the light reception measurement of a display medium. It is a figure which shows the 2nd example of the light reception measurement of a display medium. It is a figure which shows the 3rd example of the light reception measurement of a display medium. It is a figure which shows the 4th example of the light reception measurement of a display medium. It is a figure which shows the 5th example of the light reception measurement of a display medium. It is a graph of black display medium accommodation filling amount and received light amount. It is a graph of white display medium accommodation filling amount and received light amount. It is a figure which shows an example of the shape of the partition in the information display panel of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Substrate 3 Display medium 3W White display medium 3B Black display medium 4 Bulkhead 5 Electrode 6 Electrode 11a, 11b, 34, 36, 38 Substrate 12, 32, 39 Light projector 13, 33, 40 Light receiver 14 Light source / light quantity display Section 15 Data conversion section 16 Supply box 17 Transport pipe 18 Supply nozzle 19 Supply amount measurement control section 20 Data holding calculation section 21 Substrate supply section 22 Substrate transport robot 31, 35, 37 Projector / receiver

Claims (4)

At least one of the substrates is a transparent opposing substrate, and the first substrate and a second substrate provided with a partition for forming a display medium storage cell on the surface are overlapped, and the display medium is stored therebetween. An apparatus for measuring the amount of a display medium accommodated in a substrate when manufacturing an information display panel having a structure to be sealed,
A projector for projecting light toward a display medium stored in a display medium storage cell on the upper surface of the substrate;
A light receiver that receives light projected from the light projector onto the display medium and is blocked by the display medium;
With
An apparatus characterized in that a storage filling amount of a display medium is obtained from weight data converted from a light reception amount. Further comprising a display medium supply device,
2. The apparatus according to claim 1, wherein when the display medium is stored and filled in the display medium storage cell, the medium for transporting the display medium in the display medium supply device is a gas. Received light amount received by the light receiving unit The apparatus of claim 1, wherein a is converted into the weight data is converted into a voltage value. A method for measuring a storage filling amount of a display medium on a substrate while obtaining a storage filling amount of the display medium from weight data converted from a light reception amount using the apparatus according to claim 1.

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