KR20070041197A - Manufacturing method of electronic paper display device using EVA vacuum evaporation method and electronic paper display device containing EBA adhesive - Google Patents

Abstract

The present invention relates to a method for manufacturing an electronic paper display device using an EVA (Ethylene Vinyl Acetate Copolymer) vacuum deposition method and to an electronic paper display device including an EVA adhesive. In particular, a lower electrode is formed on a lower substrate, and an upper portion is disposed below the upper substrate. Forming an electrode; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Applying an EVA adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition to thin the film; Injecting particles for representing an image into the pixel space formed by the barrier ribs; Stacking the upper substrate coated with the EVA adhesive on an upper surface of the barrier rib and bonding the upper substrate to the lower substrate; and in the case of the manufacturing method of the electronic paper display device using the EVA vacuum deposition method, the adhesive having excellent adhesive ability. By implementing a thin film (VA) EVA adhesive in a thin thin film by vacuum deposition method, it can be applied to the bonding of the substrate and the partition wall in electronic paper.

Electronic paper, vacuum deposition, EVA adhesive

Description

Manufacturing Process of Electronic Paper Display Device by EVA Vacuum Sublimation and Electronic Paper Display Device Having EVA Adhesive}

1 is a cross-sectional view showing a cell structure of a collision charge type electronic paper display device according to the prior art;

2 is a cross-sectional view showing a bent form of an electronic paper display device according to the prior art,

3 is a schematic cross-sectional view showing the step of bonding the substrate and the partition wall of the electronic paper display device according to the prior art,

4 and 5 are process diagrams illustrating a manufacturing step of a substrate and a partition wall of the electronic paper display device according to one embodiment of the present invention;

6 is a cross-sectional view of a vacuum deposition apparatus for vacuum depositing an EVA adhesive on a lower substrate or an upper substrate, according to an embodiment of the present invention.

7 is a cross-sectional view of the upper substrate is coated with an EVA adhesive on the front, according to an embodiment of the present invention,

8 is a schematic view showing a method of vacuum-depositing the EVA adhesive only on the upper end of the partition wall of the lower substrate, according to an embodiment of the present invention,

9 is a schematic diagram showing a process of bonding the upper substrate and the lower substrate, the EVA adhesive is applied to the front, according to an embodiment of the present invention,

10 is a schematic diagram illustrating a process of bonding the lower substrate and the upper substrate to which the EVA adhesive is applied only to the top of the partition wall, according to an embodiment of the present invention.

11 is a cross-sectional view of an electronic paper display device coated with an EVA adhesive between a partition and an upper substrate or a lower substrate according to an embodiment of the present invention.

** Description of Symbols for Main Parts of Drawings **

1: lower substrate 2: lower electrode

3: lower insulation layer 4: partition wall

5: substrate 6: mask

7: vacuum pump 8: exhaust valve

9: heating power source 10: susceptor

11: mask holder 12: vacuum container

13: evaporation source container 14: substrate holder

15: evaporation source 16: EVA adhesive

17: roller 18: particles

The present invention relates to a method for manufacturing an electronic paper display device and an electronic paper display device, and more particularly, to a method for manufacturing an electronic paper display device using an EVA (Ethylene Vinyl Acetate Copolymer) vacuum deposition method and an electronic paper display device including an EVA adhesive. will be. More specifically, it is characterized in that the step of applying a thin film by coating the EVA adhesive by a vacuum deposition method on the upper substrate formed on the upper electrode or the lower substrate formed partition.

Due to the need for a transformation into a way of communicating and sharing information that corresponds to the information society that requires a new paradigm today, the development of electronic paper technology, which has the advantage of being able to bend as a flexible display, is entering the commercial development stage. . Electronic paper display is a flexible display device that can display characters or images by millions of beads scattered between flexible substrates such as thin plastics, which can be reproduced and used millions of times. It is expected to replace the existing print media.

In addition to the electrophoretic phenomenon, the technical approach for implementing the flexible display device includes a liquid crystal, an organic EL, a reflective film reflective display, an electrophoresis, a twist ball, and a mechanical reflective display. At present, the most attention is the display display device using the electrophoresis phenomenon. It is based on electrophoresis, which applies electromagnetic fields to conductive materials to make it moveable. It distributes conductive particles between thin flexible substrates and then collides the particles by changing the polarity of the electromagnetic field. The data is represented by a change in the arrangement of the charged particles in the direction of the arrow.

The cell structure of the collision charged electronic paper display device is shown in FIG. 1 and briefly described as follows. As shown, the structure includes upper and lower substrates 70 and 10 formed of plastic or glass, and upper and lower electrodes formed of transparent electrode ITO to apply a driving voltage of the device on the upper and lower substrates. 80 and 20, upper and lower insulating layers 90 and 30 selectively coated on the upper and lower electrodes, a partition wall 40 separating the cell and the cell, and a white tablet formed between the two electrodes. It consists of the positive charged particle 50 and the black negative charged particle 60. In addition, although the upper and lower insulating layers 90 and 30 are omitted, there is no problem in driving, but it is preferable that the upper and lower insulating layers 90 and 30 are selected to reduce the movement of the charged particles attached to the electrode.

In the electronic paper display device having the above structure, when sufficient voltage is applied to the upper electrode 80 and the lower electrode 20, charged particles 50 and 60 charged according to the applied electrode polarity are attracted to each electrode. . For example, when-voltage is applied to the upper electrode 80 and + voltage is applied to the lower electrode 20, the white charged particles 50 positively charged by the coulomb force move toward the upper substrate 70. , The charged black charged particles 60 move toward the lower substrate 10. Since the white charged particles 50 are located on the upper substrate 70 side, the white charged particles 50 appear to be white when viewed from the outside. On the contrary, when + voltage is applied to the upper electrode 80 and-voltage is applied to the lower electrode 20, the negatively charged black charged particles 60 move toward the upper substrate 70, and the positively charged white charged particles ( 50 is moved toward the lower substrate 10 to be displayed in black. Therefore, after applying a voltage so that all the cells appear white at first, only the desired cell is applied with the opposite voltage so that the cells appear black.

In the collision charge type electronic paper display device according to the related art, the charged particles 50 and 60 are vertically connected to the opposing substrates 10 and 70 to prevent movement of the charged particles 50 and 60 in the parallel direction of the substrates 10 and 70. The barrier rib 40 is formed, and the display unit of the display apparatus is implemented by a plurality of display cells divided by the barrier rib 40.

The partition wall 40 separates the pixel from the pixel, and serves to maintain a constant gap between the upper plate and the lower plate. In addition, in the flexible display device, the partition wall 40 stacked between the upper and lower plates not only has to serve as a support for maintaining a constant space between the upper and lower plates, but particularly in a flexible device that is flexibly bent. Even if the partition 40 is to be bonded to the top plate and the lower plate without falling off.

Otherwise, when the shape of the display device is deformed and bent, as shown in FIG. 2, the partition 40 is frequently lifted apart from the upper substrate 70 and the lower substrate 10. This results in a decrease in the overall quality of the display device. Therefore, especially in the flexible display device which needs to be bent flexibly, the partition 40 should be attached to the upper plate and the lower plate well.

If the upper plate, the lower plate and the partition 40 are separated from each other due to the warp, or any portion (particularly, the middle portion) is lifted up, the charged particles 50 and 60 disposed in each pixel space are different from each other. Moving to space results in unstable image quality and pixel drop, resulting in serious defects in the product's own defects.

Therefore, in recent years, the ultraviolet (UV) curable adhesive 100 is used to prevent the partition 40 from falling off from the upper plate and the lower plate and to prevent the charged particles from moving to other pixel spaces. As shown in FIG. 3, the UV-curable adhesive agent 100 is applied to the upper surface of the partition 40 formed on the lower substrate 10, the upper substrate 70 is laminated, and UV light is emitted from the upper substrate 70. By mirroring, the partition 40 and the upper substrate 70 are bonded to each other by the UV curable adhesive 100.

The UV-curable adhesive agent 100 used herein is an adhesive in which the photoreaction initiator in the liquid adhesive starts to react and is solidified into a solid adhesive within a short time when ultraviolet light by an ultraviolet lamp is irradiated onto the adhesive. That is, before ultraviolet light is irradiated, it is an adhesive in a liquid form, and when such a liquid adhesive is used, it is important to apply it to the upper surface of the partition wall accurately.

However, until now, such a liquid UV curable adhesive 100 has been applied to the upper surface of the partition wall 40 by a roller or a transfer method. In this case, the adhesive is applied to the upper surface of the partition wall 40 having a narrow area. There is a technical problem that it is quite difficult to apply correctly in a sufficient amount. In addition, in the case of the roller, the liquid adhesive may flow not only to the upper surface of the partition 40 but also to the side surface of the partition 40 to cause defective products. In addition, in the case of using the UV-curable adhesive 100, ultraviolet rays must be irradiated, and when the ultraviolet rays are irradiated onto the upper substrate, the particles in the pixel space receive heat by ultraviolet rays, thereby causing the particles to be damaged.

For this reason, in the method of manufacturing an electronic paper display device, the adhesion between the upper and lower substrates and the barrier ribs is not easily dropped, and the barrier ribs and the substrate can be easily bonded through the upper surface of the barrier ribs having a small area without damaging the particles. There is an urgent need for a way to do this.

The present invention has been made to solve the above problems, in the manufacturing method of the electronic paper display device, the substrate and the partition wall is bonded by EVA adhesive, for this purpose is a new thin film by applying the adhesive by vacuum deposition method It is to provide a method.

In particular, according to the present invention by applying a vacuum coating method of the EVA adhesive to the upper substrate or the lower substrate formed barrier ribs to thin the film, a conventional thick film (VA) type EVA adhesive excellent in adhesion ability by the vacuum deposition method It is an object of the present invention to implement a thin film type to increase the bonding strength of the substrate and the partition wall in the electronic paper.

In addition, in the vacuum deposition of the EVA adhesive on the upper surface of the plurality of partitions in the lower substrate according to the present invention, by arranging the EVA adhesive evaporation source for vacuum deposition and the lower substrate at different angles so as not to be parallel, only the upper surface of the partition wall An EVA adhesive is to be applied. In this case, it is possible to apply the adhesive precisely without applying the adhesive to the side surface of the partition in a cleaner manner than the application of the adhesive directly on the roller to the partition.

The present invention for achieving the above object relates to a method for manufacturing an electronic paper display device using an EVA (Ethylene Vinyl Acetate Copolymer) vacuum deposition method and an electronic paper display device comprising an EVA adhesive, in particular to form a lower electrode on the lower substrate Forming an upper electrode under the upper substrate; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Applying an EVA adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition to thin the film; Injecting particles for representing an image into the pixel space formed by the barrier ribs; Stacking the upper substrate coated with the EVA adhesive on an upper surface of the barrier rib and bonding the upper substrate to the lower substrate, wherein the electronic paper display device is manufactured by using the EVA vacuum deposition method.

The present invention is characterized in that the step of applying a thin film by coating the EVA adhesive by a vacuum deposition method on the upper substrate or the bottom substrate formed barrier ribs, the step of applying a thin film by applying the EVA adhesive by the vacuum deposition method, A lower electrode may be formed on the substrate, and an upper electrode may be formed below the upper substrate. In addition, the step of applying the EVA adhesive by vacuum deposition to thin the film may be performed after the step of injecting particles for representing an image into the pixel space formed by the partition wall.

In addition, the step of applying the EVA adhesive to the upper substrate by a vacuum deposition method to thin the film, the step of disposing the EVA adhesive evaporation source on the lower side of the vacuum deposition apparatus, and disposing the upper substrate on the upper side of the vacuum deposition apparatus; Making the inside of the vacuum deposition apparatus in a vacuum state, heating the EVA adhesive evaporation source, and applying the EVA adhesive to the entire surface of the upper substrate.

In addition, in the present invention, the partition wall may be formed on the lower substrate or the upper substrate, and the method of applying the EVA adhesive to the partition formed on the lower substrate may include forming a lower electrode on the lower substrate and an upper electrode under the upper substrate. Doing; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Applying a thin film of EVA adhesive to the plurality of partition walls by vacuum deposition; Injecting particles for representing an image into the pixel space formed by the barrier ribs; And stacking the upper substrate on which the upper electrode is formed, on the upper surface of the barrier rib on which the EVA adhesive is applied, and bonding the upper substrate to the lower substrate.

And, in the step of applying a thin film by coating the EVA adhesive on the upper surface of the partition by vacuum deposition method, the EVA adhesive evaporation source is disposed below the inside of the vacuum deposition apparatus, and the lower substrate on which the plurality of partition walls are formed is disposed with the EVA adhesive evaporation source. Arranging the upper side inside the vacuum deposition apparatus at different angles so as not to be parallel; It is preferable to include a; making the inside of the vacuum deposition apparatus in a vacuum state, by heating the EVA adhesive evaporation source, applying the EVA adhesive only to the upper end of the plurality of partition walls.

In the present invention as described above, the EVA adhesive is applied by a vacuum deposition method, characterized in that the thin film, the thickness of the EVA adhesive is preferably applied within the range of 0.1 ㎛ to 3.0 ㎛, so coated EVA adhesive The bonding of the upper substrate to the lower substrate by using the method comprises: placing the upper substrate and the lower substrate between rollers having a temperature in the range of 100 ° C. to 120 ° C., and a substrate transfer speed of 0.5 cm / m to 1.5 cm /. It is more preferable to make them adhere within m range.

Another preferred embodiment for achieving another object of the present invention is an electronic paper display device comprising an EVA adhesive. That is, the lower substrate and the upper substrate disposed to face at a predetermined interval; A lower electrode and an upper electrode inscribed to the lower substrate and the upper substrate, respectively; A partition wall which divides the pixel between the lower electrode and the upper electrode to form a pixel space; And a plurality of charged particles encapsulated in the pixel space, wherein the EVA adhesive for bonding the lower substrate and the upper substrate is present in the form of a thin film between the barrier rib and the lower substrate or the upper substrate. Is an electronic paper display element.

Here, the EVA adhesive may be present only in a portion where the partition wall is in contact with the lower substrate or the upper substrate, the thickness of the EVA adhesive is preferably in the range of 0.1 ㎛ to 3.0 ㎛, the EVA adhesive is ethylene (ethylene) and vinyl As a copolymer of acetate (Vinyl Acetate), the content of the vinyl acetate is more preferably in the range of 25% to 50%.

The present invention as described above is to bond the substrate and the partition wall using EVA adhesive, and when the voltage is applied to the electrode formed on the substrate to prevent the charging particles for image representation to move to another cell, the lower insulating layer on the lower electrode The upper insulating layer may be formed below the upper electrode. In addition, the particles used in the present invention may be any particles used to represent an image in the technical field to which the present invention belongs, but is preferably a chargeable or charged dry particle.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

4 and 5 are process diagrams illustrating a manufacturing step of a substrate and a partition of an electronic paper display device according to an embodiment of the present invention, wherein reference numeral 1 is a lower substrate, 2 is a lower electrode, and 3 is a lower insulating layer. , 4 means bulkhead.

First, according to the manufacturing method of the electronic paper display device using the embossed coating method according to the present invention, forming a lower electrode 2 on the lower substrate 1, and forming an upper electrode (not shown) below the upper substrate Go through. In the present invention, forming the upper electrode on the upper substrate is the same as the method of forming the lower electrode 2 on the lower substrate 1, and thus, the method of forming the lower electrode 2 on the lower substrate 1 will be described. Instead of the description of the upper substrate and the upper electrode.

As shown in FIG. 4, a transparent lower electrode 2 and a lower insulating layer 3 are sequentially formed on the lower substrate 1. Since the basic electrode structure of the electronic paper display device according to the present invention is a matrix structure, the lower electrode 2 has a shape as shown in the right side of FIG. Preferably, the transparent lower electrode 2 is ITO, and there is no problem in driving even if the lower insulating layer 3 applied thereon is omitted. Is preferably applied since it can be difficult to preserve the image for a long time without applying new power.

Next, a plurality of barrier ribs 4 are formed on the lower electrode 2 to form the pixel space. That is, as shown in FIG. 5, a plurality of partition walls 4 are formed on the lower electrode 2 and the lower insulating layer 3 formed on the lower substrate 1. In FIG. 5, the partition wall 4 is formed on the lower insulating layer 3, but in the present invention, the lower insulating layer 3 may be omitted, as described above. 2) It is also possible to form a partition wall 4 for forming a pixel space directly on.

Since the partition 4 is simply used to distinguish cell units, the material may be variously applied to a polymer, an inorganic material, and the like. In the present invention, a method for constructing the partition 4 is preferably a photolithography method using a photoresist, a method using a photosensitive polymer, a laminating method using a cut of a pre-made material, and the like. In the case of bonding 4), a method such as UV adhesive and UV irradiation may be applied on the preformed bottom plate. The partition 4 according to the present invention has a lattice structure as shown in the perspective view on the right side of FIG. 5.

Subsequently, a thin film is formed by applying EVA (Ethylene Vinyl Acetate Copolymer) adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition. The EVA adhesive used in the present invention refers to a copolymer resin prepared at a high pressure of 2,500 atm or higher using ethylene and vinyl acetate (VA) as a raw material, and the vacuum deposition method is an evaporation source (metal, semiconductor, insulator). And the like, in the present invention, EVA adhesive is evaporated at a high temperature to adhere to the surface of the substrate to form it.

First, the EVA adhesive used in the present invention will be described in detail. EVA adhesive is a copolymer of ethylene and vinyl acetate (VA) as described above, and has excellent transparency, flexibility, low temperature brittleness, and is used as a raw material resin for footwear materials, agricultural films, extrusion coatings, and the like. It is a resin that is attracting attention as a substitute material for polyvinyl chloride (PVC) due to its excellent ductility.

One of the features of the EVA adhesive according to the invention is its high affinity with other resins. Generally, resins such as LDPE, LLDPE, HDPE, or PP are purely carbon and hydrogen, and are nonpolar resins. Nylon, polyester, etc. are separated into polar resins because they contain oxygen atoms in addition to carbon and hydrogen. Polarity is mixed between polarity and nonpolarity only. Ethylene is nonpolar, while VA is a polar material containing oxygen atoms. EVA resins are well mixed with polar resins as well as nonpolar resins. It is also compatible with chemical additives. This characteristic is different from the barrier ribs and the substrate in the electronic paper, and the barrier ribs and the substrate may be made of various kinds of non-polar resin or polar resin, EVA adhesive according to the present invention is any kind of barriers and substrates Also has excellent effects that can be bonded.

The EVA adhesive is a copolymer of ethylene and VA, and its physical properties can be variously determined according to molecular weight, VA content and degree of polymerization. As the molecular weight of the EVA adhesive increases, the toughness, plasticity and impact resistance can be improved, and the moldability and surface gloss decrease. On the other hand, the lower the VA content, the properties are similar to polyethylene (PE), and as the content is increased, the compatibility with polymers or plasticizers having different density, rubber elasticity, and flexibility is improved, and the softening temperature is lowered.

In general, the VA content of about 7% to 60% is called EVA resin, and in the adhesive of the electronic paper according to the present invention, less than 25% is regarded as a material of PE, and more than 50% is not seen as a plastic material. Because it is excluded from EVA. Thus, the present invention is most preferred EVA adhesive having a VA content of about 25% to 50%.

EVA with low VA content is usually processed like PE and has good printing aptitude, so it is used as a film, gasket, tube, various containers, laminate, foamed product, heavy packing bag, and the like. In addition, since the elasticity and abrasion resistance of EVA resin are improved by crosslinking and foaming, it is widely used in the fields of footwear such as shoes and sandals, tires such as strollers and tricycles, and special molding machines have also been developed. For example, containing about 10% to 20% of VA is blended with PVC or other resins to be used to improve flexibility at low temperatures. In addition, containing 25% to 30% of VA is compatible with paraffin wax, and is effective in improving fragility, moisture resistance, heat bonding, and the like by adding. Copolymers with high VA content have good compatibility with various plasticizers and natural resins, and are excellent in aging stability and weather resistance. In particular, they are widely used in the fields of bookbinding, plywood, shoemaking, and the like.

However, these conventional EVA resin products are all in the form of a thick film, and thus are not suitable for use as an adhesive for electronic paper having a very fine size. In order to solve this problem, the present invention is a thin film of EVA by introducing a vacuum deposition method in applying the adhesive to the substrate and the partition of the electronic paper. That is, the present invention is characterized by the use of EVA as an adhesive material, for this purpose is a patent for applying a vacuum deposition method. Hereinafter, such a vacuum deposition method will be described.

The vacuum deposition method used to apply the EVA adhesive in the present invention, as described above, is formed by evaporating the evaporation source (metal, semiconductor, insulator, etc., in the present invention, EVA adhesive) by attaching it to the surface of the substrate. Way. In other words, by using a vacuum deposition apparatus, the object to be coated in a high vacuum and the metal or adhesive material to be attached to the surface is put, and when heated to evaporate the material, it adheres to the cold object surface to use By forming the epidermis.

An apparatus for forming a thin film by a vacuum deposition method is called a vacuum deposition apparatus, and FIG. 6 is a cross-sectional view of a vacuum deposition apparatus for vacuum depositing an EVA adhesive on a lower substrate or an upper substrate according to an embodiment of the present invention. As shown here, the vacuum deposition apparatus is formed by disposing the evaporation source container 13 and the substrate holder 14 inside the vacuum container 12 connected to the vacuum system. The evaporation source 15 is accommodated in the evaporation source container 13. The substrate holder 14 is equipped with an upper substrate 5 on which a thin film is to be formed, and a mask 6 defining a deposition region. The vacuum chamber 12 is connected to a vacuum system composed of a vacuum pump 7, an exhaust valve 8, and the like used to depressurize the inside of the vacuum chamber. Then, the heating power source 9 is connected to the evaporation source container 13.

Using such a vacuum deposition apparatus, applying the EVA adhesive by a vacuum deposition method to thin the film, first, the EVA adhesive evaporation source is disposed below the inside of the vacuum deposition apparatus, and the upper substrate is disposed above the inside of the vacuum deposition apparatus. Perform the steps. That is, in the thin film formation using the EVA adhesive, first the evaporation source 4 is accommodated in the evaporation source container 2, and the upper substrate 5 to which the thin film is attached to the substrate holder 3 is fixed.

As shown in Fig. 6, in the vacuum deposition apparatus according to the present invention, the evaporation source container 13 is disposed below the vacuum container (in the direction of gravity), and the substrate holder 14 is disposed above the vacuum container. This is because when the evaporation source container is placed on the upper side and the substrate holder is placed on the lower side, the evaporation source container (evaporated material) or the evaporated material that is heated and liquid is dropped from the evaporation source container to the substrate surface, making it difficult to form a uniform thin film. to be.

Here, in the case where only a desired portion is to be vacuum deposited on the substrate in the substrate holder 14, the mask method may be used in parallel. In order to set the thin film shape by the mask method, the mask 6 in which the opening is formed in the thin film shape required on the upper substrate 5 on which the thin film is to be formed may be brought into close contact and fixed.

Next, the inside of the vacuum deposition apparatus is made into a vacuum state, and the EVA adhesive evaporation source is heated to apply the EVA adhesive to the entire surface of the upper substrate. That is, the inside of the vacuum vessel 12 is reduced to a vacuum state by the vacuum pump 7, and the evaporation source 15 accommodated in the evaporation source container 13 is heated. The molecules evaporated by heating fly inside the vacuum vessel 12 in the direction of the upper substrate 5 (from the lower side to the upper side in the vacuum deposition apparatus shown in FIG. 6), and are attached (deposited) to the surface of the upper substrate 5. It becomes a thin film.

7 is a cross-sectional view of the upper substrate 5 coated with the EVA adhesive 16 on the front surface according to one embodiment of the present invention, and the EVA adhesive on the upper substrate 5 on which the upper electrode is formed by the above-described method. (16) was applied to form a thin film by vacuum deposition. Applying the EVA adhesive 16 by such a vacuum deposition method according to the present invention may have an effect that the unsentence in the thin film is not mixed well. As shown, although the EVA adhesive is applied to the front surface of the upper substrate 5, the EVA adhesive will be fired soon, and since the temperature inside the substrate is not so high, sticking of the charged particles does not need to be considered. .

The present invention is characterized in that the step of applying a thin film by coating the EVA adhesive by a vacuum deposition method on the upper substrate or the bottom substrate formed barrier ribs, the step of applying the thin film by vacuum deposition EVA adhesive, the bottom A lower electrode may be formed on the substrate, and an upper electrode may be formed below the upper substrate. That is, forming a lower electrode on the lower substrate, and forming an upper electrode below the upper substrate; Applying an EVA adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition to thin the film; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Injecting particles for representing an image into the pixel space formed by the barrier ribs; A method of manufacturing an electronic paper display device using an EVA vacuum deposition method, comprising: stacking an upper substrate coated with the EVA adhesive on an upper surface of the barrier rib and bonding the upper substrate to the lower substrate.

In addition, the step of applying the EVA adhesive by vacuum deposition to thin the film may be performed after the step of injecting particles for representing an image into the pixel space formed by the partition wall. That is, forming a lower electrode on the lower substrate, and forming an upper electrode below the upper substrate; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Injecting particles for representing an image into the pixel space formed by the barrier ribs; Applying an EVA adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition to thin the film; Stacking the upper substrate coated with the EVA adhesive on an upper surface of the barrier rib and bonding the upper substrate to the lower substrate, wherein the upper substrate coated with the EVA adhesive may be a method of manufacturing an electronic paper display device using an EVA vacuum deposition method.

Another preferred embodiment of the present invention is a method of applying an EVA adhesive to a lower substrate on which a plurality of partitions are formed. That is, forming a lower electrode on the lower substrate and forming an upper electrode below the upper substrate; and forming a plurality of barrier ribs for forming pixel space on the lower electrode; It is to perform the step of thinning by applying an EVA adhesive to the vacuum deposition method.

The method of forming the substrate, the electrode and the partition wall is the same as that of the upper substrate described above, and there is a difference only in the method of applying the EVA adhesive by vacuum deposition. 8 is a schematic view showing a method of vacuum depositing the EVA adhesive 16 only on the upper end of the partition wall 4 of the lower substrate 1 according to an embodiment of the present invention. The method of vacuum coating the EVA adhesive on the lower substrate is similar to the method of vacuum depositing the EVA adhesive on the upper substrate described above, but the adhesive 16 is applied only to the tops of the plurality of partitions 4 on the lower substrate 1. Is different.

That is, in applying the EVA adhesive 16 to the lower substrate according to the present invention, the step of applying the EVA adhesive by a vacuum deposition method to thin the film, first, the EVA adhesive evaporation source is disposed below the inside of the vacuum deposition apparatus, and The lower substrate 1 having the plurality of partition walls 4 formed thereon is disposed above the inside of the vacuum deposition apparatus at different angles so as not to be parallel to the disposed EVA adhesive evaporation source. Then, the inside of the vacuum deposition apparatus is vacuumed, and the EVA adhesive evaporation source is heated.

Then, as shown in Figure 8, the straight EVA EVA evaporation source is to be applied obliquely to the partition 4 in the lower substrate (1). That is, in the present invention, the EVA adhesive 16 may be deposited only on the uppermost portion of the partition wall 4 by tilting and depositing the specimen by using only the vacuum evaporation advantage. In this embodiment, since the adhesive is not applied to the portion corresponding to the pixel region, there is an effect that the aggregation of the particles can be prevented at the source.

Thereafter, particles 18 for displaying an image are injected into the pixel space formed by the partition wall 4. Particles 18 are for image representation, and two kinds of charged particles having different colors and charging characteristics may be mixed and injected, respectively. The particles 18 may be charged with charged or non-chargeable particles. The kind of the particles 18 is not particularly limited, and any particles used for image representation in the art may be used. That is, not only a solid but also particles of an electrolyte solution, a suspension, a sol, a gel, a capsule, and a twist ball may be included. Preferably, it is preferable to inject dry particles 18 having no viscous properties such as liquids, suspensions and the like. That is, after the uncharged particles 18 are injected, dry collision-charged particles having a charged type to form charged particles by applying a voltage to the upper and lower electrodes to collide the particles 18 with each other to be charged by collision ( 18) is preferred.

As the method of injecting the particles 18, a general method of injecting charged particles into an electronic paper display device may be used in the art. For example, particles can be injected into a cell in which a pixel space is formed by an injection method by a spray coating method, an injection method by an electrostatic coating method, or the like.

Finally, after the above process, as shown in Figure 9 and 10, the upper substrate and the lower substrate is bonded. FIG. 9 is a schematic view illustrating a process of bonding an upper substrate and a lower substrate coated with an EVA adhesive to a front surface according to an embodiment of the present invention, and FIG. 10 is an EVA adhesive layer only on a top of a partition wall according to an embodiment of the present invention. Is a schematic diagram showing a process of bonding the upper substrate and the lower substrate is coated.

First, as shown in FIG. 9, the upper substrate 5 coated with the EVA adhesive 16 according to the present invention is laminated on the upper surface of the partition 4 to be bonded to the lower substrate 1. The stacking and bonding method is performed by placing an EVA adhesive 16 coated so that the upper substrate 5 on which the upper electrode (not shown) is formed and the lower substrate 1 on which the partition wall 4 is formed face each other. The electrode and the lower electrode (not shown) are stacked in the vertical direction. The upper electrode and the lower electrode serve as a scan electrode and a data electrode to adjust the voltage of each cell.

After the upper substrate 5 coated with the EVA adhesive 16 and the plurality of partition walls 4 formed on the lower substrate 1 come into contact with each other, the upper substrate 5 or the lower substrate 1 To rub the upper substrate and the lower substrate by the EVA adhesive 6. The method of laminating the upper substrate 5 and the lower substrate 1 and bonding them with a roller is the same as when the EVA adhesive 16 is applied to the lower substrate 1 on which the partition 4 is formed, as shown in FIG. 10. Do. Obviously, the roller 17 may be rubbed on either the upper substrate 5 or the lower substrate 1, or may be rubbed on both the upper substrate 5 and the lower substrate 1.

According to another feature of the present invention, the step of bonding the upper substrate 5 and the lower substrate 1 in this way, the temperature of the upper substrate 5 and the lower substrate 1 in the range of 100 ℃ to 120 ℃ It puts between the rollers which have, and makes a board | substrate conveyance speed adhere within the range of 0.5 cm / m-1.5 cm / m. Vacuum deposition of the EVA adhesive according to the present invention is a process that the EVA adhesive 16 is thinned by a thermocompression process, it is preferable to proceed at an appropriate temperature and speed.

As such, when the EVA adhesive 16 is applied using the vacuum deposition method and the upper substrate 5 and the lower substrate 1 are bonded together using the roller 17, the EVA adhesive 16 according to the present invention is In the case of the upper substrate, this is not a problem for substrates that have already been fired in the pixel space region or the temperature is not so high. In the case of the lower substrate, the adhesive is provided only at the top of the partition wall 4 in advance so that only the portion where the partition and the substrate are in contact The adhesive can be located. Thus, as in the case of using conventional UV ultraviolet rays, when one partition is bonded, it will not affect the other partitions already around.

When the substrate and the partition wall of the electronic paper are bonded to each other using the EVA adhesive according to the present invention as described above, since the UV curable adhesive is not used as in the prior art, the defective rate due to the leakage of the liquid adhesive can be prevented, Damage can also be significantly reduced. In addition, the present invention does not apply the adhesive directly to the partition wall, but by applying an EVA adhesive to the upper substrate formed on the upper electrode or the lower substrate formed on the partition by vacuum evaporation to thin the film, the conventional thick film form excellent in adhesion ability EVA adhesive of the thin film type by implementing the vacuum deposition method, it is possible to increase the bonding strength of the substrate and the partition wall in electronic paper.

On the other hand, another preferred embodiment for achieving the other object of the present invention is an electronic paper display element in which the above-described EVA adhesive is present in a thin film form. The electronic paper display device according to the present invention in which the EVA adhesive is formed according to the above-described method is as shown in FIG. 11. As shown, the upper substrate 5 and the lower substrate 1 are joined through the partition wall 4 by EVA adhesive.

11 is a cross-sectional view of an electronic paper display device coated with an EVA adhesive between a partition and an upper substrate or a lower substrate according to an embodiment of the present invention. As shown here, the electronic paper display device including the EVA adhesive according to the present invention comprises: a lower substrate 1 and an upper substrate 5 disposed to face each other at a predetermined interval; A lower electrode and an upper electrode inscribed to the lower substrate 1 and the upper substrate 5, respectively; A partition wall which divides the pixel between the lower electrode and the upper electrode to form a pixel space; And a plurality of charged particles encapsulated in the pixel space, wherein an EVA adhesive for bonding the lower substrate 1 and the upper substrate 5 to the partition wall and the lower substrate 1 or the upper substrate 5 is included. It is characterized by the existence of a thin film in between.

Here, although the upper and lower insulating layers are omitted, there is no problem in driving, but it is preferable that the charged particles 18 are selected to reduce the movement of the particles attached to the electrodes. Then, if necessary, by alternately applying the opposite voltage to each electrode by moving the charged particles 18 to collide with each other so as to be charged in the negative or positive direction, respectively.

As shown in Fig. 11, the structure has at least one transparent upper and lower substrates 5 and 1 and transparent electrodes so as to apply a driving voltage of the device on the upper and lower substrates 5 and 1, respectively. Upper and lower electrodes formed of ITO, black and white charged particles 18 existing between the upper and lower electrodes, and partition walls 4 separating the cells from the upper and lower substrates 5 and 1. )

In the electronic paper display device having the structure described above, the barrier rib 4 may be more strongly coupled to the lower substrate 1 and the upper substrate 5 between the lower substrate 1 and the upper substrate 5. The adhesive is characterized in that it is provided in a thin film form. That is, by implementing a conventional thick film (VA) EVA adhesive having excellent adhesive ability in a thin thin film form by the vacuum deposition method, it can be applied to the bonding of the substrate and the partition wall in electronic paper.

According to the present invention, if the EVA adhesive is applied only to the upper end of the partition on the lower substrate, the EVA adhesive may be characterized in that the partition is present only at the portion in contact with the lower substrate or the upper substrate. In addition, when the thickness of the EVA adhesive is 0.1 μm or less, it is difficult to bond the substrate and the partition wall due to the small adhesive force, and when the thickness is 3.0 μm or more, the resolution of the pixel space may be reduced, and thus the thickness of the EVA adhesive is 0.1 μm to 3.0. It is preferable to exist in the micrometer range.

The electronic paper display device according to the present invention is configured such that when sufficient voltage is applied to the upper electrode and the lower electrode, charged particles 18 charged according to the applied electrode polarity are attracted to each electrode. In addition, although not shown, a color filter may be provided on the top plate to implement red, green, and blue colors for each pixel, and a desired color may be obtained by filtering light transmitted from the charged particles.

In the above description, it should be understood that those skilled in the present invention can only make modifications and changes to the present invention without changing the gist of the present invention as merely illustrative of a preferred embodiment of the present invention.

According to the present invention as described above, forming a lower electrode on the lower substrate, and forming an upper electrode below the upper substrate; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Applying an EVA adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition to thin the film; Injecting particles for representing an image into the pixel space formed by the barrier ribs; Stacking the upper substrate coated with the EVA adhesive on the upper surface of the barrier rib and bonding the upper substrate to the lower substrate, thereby providing an electronic paper display device manufacturing method using an EVA vacuum deposition method.

In the case of bonding the substrate and the partition wall of the electronic paper by using the EVA vacuum deposition method according to the present invention, it is possible to prevent the failure rate due to the leakage of the liquid adhesive because it does not use a conventional UV-curable adhesive, Damage can also be significantly reduced. In addition, the present invention does not apply the adhesive directly to the partition wall, but by applying an EVA adhesive to the upper substrate formed on the upper electrode or the lower substrate formed on the partition by vacuum evaporation to thin the film, the conventional thick film form excellent in adhesion ability By implementing the EVA adhesive in a thin thin film by vacuum deposition method, there is an effect that can increase the bonding strength of the substrate and the partition wall in the electronic paper.

In addition, in evacuating EVA adhesive on a plurality of partition upper surfaces of the lower substrate, EVA adhesive is applied only to the upper surface of the partition by arranging the EVA adhesive evaporation source for vacuum deposition and the lower substrate at different angles so as not to be parallel. It can work. In this case, first of all, the adhesive may not be applied to the side surface of the partition in a cleaner manner than the adhesive is directly applied to the rollers, and the adhesive may be applied precisely.

Claims (14)

Forming a lower electrode on the lower substrate, and forming an upper electrode under the upper substrate; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Coating a thin film by applying an EVA (Ethylene Vinyl Acetate Copolymer) adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition; Injecting particles for representing an image into the pixel space formed by the barrier ribs; Stacking the upper substrate coated with the EVA adhesive on an upper surface of the barrier rib and bonding the upper substrate to the lower substrate; an electronic paper display device using the EVA vacuum deposition method. Forming a lower electrode on the lower substrate, and forming an upper electrode under the upper substrate; Applying an EVA adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition to thin the film; Forming a plurality of barrier ribs for forming pixel space on the lower electrode; Injecting particles for representing an image into the pixel space formed by the barrier ribs; Stacking the upper substrate coated with the EVA adhesive on an upper surface of the barrier rib and bonding the upper substrate to the lower substrate; an electronic paper display device using the EVA vacuum deposition method. Forming a lower electrode on the lower substrate, and forming an upper electrode under the upper substrate; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Injecting particles for representing an image into the pixel space formed by the barrier ribs; Applying an EVA adhesive to the upper substrate on which the upper electrode is formed by vacuum deposition to thin the film; Stacking the upper substrate coated with the EVA adhesive on an upper surface of the barrier rib and bonding the upper substrate to the lower substrate; an electronic paper display device using the EVA vacuum deposition method. The method of claim 1, The step of applying the EVA adhesive by vacuum deposition to thin film, Disposing the EVA adhesive evaporation source under the vacuum deposition apparatus and disposing the upper substrate above the vacuum deposition apparatus; Manufacturing the electronic paper display device using the EVA vacuum deposition method comprising the step of making the inside of the vacuum deposition apparatus in a vacuum state and heating the EVA adhesive evaporation source to apply the EVA adhesive to the entire surface of the upper substrate. Way. Forming a lower electrode on the lower substrate and forming an upper electrode below the upper substrate; Forming a plurality of barrier ribs for forming pixel spaces on the lower electrodes; Applying a thin film of EVA adhesive to the plurality of partition walls by vacuum deposition; Injecting particles for representing an image into the pixel space formed by the barrier ribs; Stacking the upper substrate on which the upper electrode is formed, on an upper surface of the barrier rib coated with the EVA adhesive, and bonding the upper substrate to the lower substrate; and manufacturing an electronic paper display device using the EVA vacuum deposition method. The method of claim 5, The step of applying the EVA adhesive by vacuum deposition to thin film, Disposing the EVA adhesive evaporation source on the lower side of the vacuum evaporation apparatus, and disposing the lower substrate on which the plurality of partition walls are formed so as not to be parallel to the disposed EVA adhesive evaporation source on the upper side of the vacuum evaporation apparatus; Manufacturing the electronic paper display device using the EVA vacuum deposition method comprising the step of making the inside of the vacuum deposition apparatus in a vacuum state, heating the EVA adhesive evaporation source, and applying the EVA adhesive only to the plurality of partition walls. Way. The electronic paper display device according to any one of claims 1 to 6, wherein the thickness of the EVA adhesive is applied in a range of 0.1 µm to 3.0 µm. The method according to any one of claims 1 to 6, Bonding the upper substrate with the lower substrate, The upper substrate and the lower substrate are sandwiched between rollers having a temperature in the range of 100 ° C. to 120 ° C., and the substrates are bonded to each other at a substrate conveying speed of 0.5 cm / m to 1.5 cm / m. Manufacturing method of paper display element. A lower substrate and an upper substrate disposed to face each other at a predetermined interval; A lower electrode and an upper electrode inscribed to the lower substrate and the upper substrate, respectively; A partition wall which divides the pixel between the lower electrode and the upper electrode to form a pixel space; And To include a plurality of charged particles encapsulated in the pixel space, An electronic paper display device comprising an EVA adhesive for bonding the lower substrate and the upper substrate in a thin film form between the barrier rib and the lower substrate or the upper substrate. The electronic paper display device of claim 9, wherein the EVA adhesive is present only at a portion where the barrier rib is in contact with the lower substrate or the upper substrate. The electronic paper display device of claim 9, wherein the EVA adhesive has a thickness in a range of 0.1 μm to 3.0 μm. The electronic paper comprising an EVA adhesive according to claim 9, wherein the EVA adhesive is a copolymer of ethylene and vinyl acetate, and the content of vinyl acetate is in a range of 25% to 50%. Display element. The electronic paper display device according to any one of claims 9 to 12, wherein a lower insulating layer is formed on the lower electrode, and an upper insulating layer is formed below the upper electrode. The electronic paper display device according to any one of claims 9 to 12, wherein the particles are charged or non-charged dry particles.

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