KR20060078643A - Reflective electronic paper display device and fabricating method thereof - Google Patents

Abstract

The present invention relates to a reflective electronic paper display device capable of high definition by forming partition particles in a two-layer structure and injecting one charged particle for expressing color into cells formed by the partition particles of the two-layer structure. An upper and lower substrate formed of either plastic or glass; Upper and lower electrodes formed on the upper and lower substrates by applying driving voltages of the devices, and formed of transparent electrodes; Barrier rib particles having a constant gap between the upper and lower substrates and formed in a two-layer structure; Forming a lower electrode on the lower substrate and forming the partition particle of a two-layer structure on the structure, the charging particle being injected into a cell formed by the partition particle; Injecting charged particles for expressing color into a cell region formed by the partition particles; Forming an upper electrode on the upper substrate, and attaching the upper structure on which the upper electrode is formed to face the cell formed by the partition particles, and attaching the upper electrode to the upper partition wall particles formed on the lower substrate structure. And there is an effect that can improve the image quality.

Description

Reflective electronic paper display device and manufacturing method thereof {REFLECTIVE ELECTRONIC PAPER DISPLAY DEVICE AND FABRICATING METHOD THEREOF}

1 is a cross-sectional view showing a cell structure of a conventional electrophoretic electronic paper display device.

Fig. 2 is a sectional view showing a cell structure of a conventional toner type electronic paper display element.

3A and 3B are cross-sectional views (a) and plan views (b) of the reflective electronic paper display device of the present invention.

Figures 4a to 4e is a cross-sectional view showing the manufacturing process of the reflective electronic paper display device of the present invention.

** Description of the symbols for the main parts of the drawings **

100: lower substrate 110: lower electrode

120: partition particle 130: charged particles

140: upper substrate 150: upper electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective electronic paper display device and a method for manufacturing the same. Particularly, a partition particle is formed into a two-layer structure, and one charged particle for expressing color is injected into a cell formed by the partition particle of the two-layer structure. The present invention relates to a reflective electronic paper display device capable of high definition and a manufacturing method thereof.

Digital paper displays are being developed as next-generation display devices, followed by liquid crystal displays, plasma display panels, and organic luminescence devices. In particular, electronic paper is a flexible substrate such as a thin plastic with millions of beads scattered in an oil hole, and a display element that can display characters or images. It can be reproduced and used millions of times. It is expected to be a material to replace existing print media such as newspapers and magazines.

Electronic paper displays are the core of flexible (or paper) display implementations, and are based on electrophoresis, which applies electromagnetic fields to conductive materials to make them moveable. After the conductive fine particles are distributed, the data is represented by a change in the arrangement of the fine particles (or toner particles) due to the change in the polarity of the electromagnetic field.

Reflective electronic paper display devices include electrophoretic, xylic, and toner type electronic paper display devices. FIG. 1 is a cross-sectional view showing a cell structure of a conventional electrophoretic electronic paper display device. As shown, the upper and lower substrates 1 and 8 formed of either plastic or glass, and the upper and lower electrodes 2 and 7 for applying a driving voltage of the device on the upper and lower substrates 1 and 8. ), A capsule (6) formed between the two electrodes (2, 7), black particles (5) and white particles (3) and dielectric fluid (4) formed inside the capsule (6) It is composed.

The electronic paper display device having the above configuration may implement black and white by applying an electric field to the upper electrode 2 and the lower electrode 7. That is, when a positive potential is applied on the upper electrode 2 and the lower electrode 7, the white fine particles 3 are drawn upwards, and the black fine particles 5 are drawn downwards to display white. On the contrary, when a negative potential is applied to the upper electrode 2 and the lower electrode 7, the opposite phenomenon occurs to display black.

However, the electrophoretic type or xylic type of the conventional reflective electronic paper display device has a problem in that the central part of the cell is the most clear and blurs toward the outer part because the color is displayed by the fine particles injected into the microcapsules.

2 is a cross-sectional view showing a cell structure of a conventional toner electronic paper display element. As shown, the upper and lower substrates 60 and 10 formed of any one of plastic or glass, and the driving voltage of the device is applied on the upper and lower substrates 60 and 10, and the upper and lower substrates are formed of transparent electrodes. Between the electrodes 50 and 20, the partition wall 70 for isolating the cell from the cell and keeping the gap between the upper and lower substrates 60 and 10 constant, and between the two electrodes 50 and 20. It consists of the formed white toner particles 40 and black toner particles 30.

In the toner type electronic paper display device having such a configuration, when sufficient voltage is applied to the upper electrode 50 and the lower electrode 20, toner particles having a charge control agent (CCA) charged according to the applied electrode polarity are transferred to each electrode. Attracted. For example, the white toner particles 40 have (-) and the black toner particles 30 have (+) properties, and a positive voltage is applied to the upper electrode 50 and a negative voltage to the lower electrode 20. When the white toner particles 40 move to the upper electrode 50, the black toner particles 30 move to the lower electrode 20 to become white. On the contrary, when a negative voltage is applied to the upper electrode 50, the black toner particles 30 are moved to the upper electrode 50 to have a black color.

However, since the toner type of the conventional reflective electronic paper display device uses a partition wall for separating the cell from the cell, it is difficult to implement high definition due to the partition wall.

Therefore, the present invention was created in order to solve the conventional problems as described above, by forming the partition particles in a two-layer structure to maintain a constant distance between the upper substrate and the lower substrate, and the four upper layers of charged particles for expressing the color SUMMARY OF THE INVENTION An object of the present invention is to provide a reflective electronic paper display device and a method for manufacturing the same, which can improve the definition and image quality by injecting the cells formed by the partition particles.

Reflective electronic paper display device of the present invention for achieving the above object is an upper and lower substrate formed of any one of plastic or glass; Upper and lower electrodes formed on the upper and lower substrates by applying driving voltages of the devices, and formed of transparent electrodes; Barrier rib particles having a constant gap between the upper and lower substrates and formed in a two-layer structure; It is characterized by consisting of charged particles injected into the cell formed by the partition particles.                         

According to an aspect of the present invention, there is provided a method of manufacturing a reflective electronic paper display device, the method including: forming a lower electrode on an upper portion of a lower substrate, and forming barrier rib particles having a two-layer structure on the structure; Injecting charged particles for expressing color into a cell region formed by the partition particles; Forming an upper electrode on the upper substrate, and attaching the upper structure on which the upper electrode is formed to face the cell formed by the partition particles, and attaching the upper electrode to the upper partition wall particles formed on the lower substrate structure. .

With reference to the accompanying drawings, a preferred embodiment of the present invention, the reflective electronic paper display device having the above characteristics and a manufacturing method thereof will be described.

3 is a sectional view (a) and a plan view (b) of an embodiment of the reflective electronic paper display device of the present invention. As shown, the upper and lower substrates 140 and 100 formed of any one of plastic or glass, and the driving voltage of the device is applied on the upper and lower substrates 140 and 100, and the upper and lower substrates are formed of transparent electrodes. The gap between the electrodes 150 and 110, the upper and lower substrates 140 and 100, and the barrier ribs 120 formed in two layers and the two electrodes 150 and 110 are maintained. It consists of charged particles 130 for expression. Although not shown, a space between the partition particles 120 may be filled with air or a liquid (dielectric liquid). The barrier particle 120 displays a background color of the display device, for example, black or white.

The barrier particle 120 is formed of a polymer material such as polycarbonate, polyester (PET), high purity acrylic resin (PMMA), and the size of the barrier particle 120 is a two-layered upper substrate 140. The size may be sufficient to maintain the gap between the lower substrate 100 and the lower substrate 100. The size may vary depending on the distance between the upper substrate 140 and the lower substrate 100, and may be determined by the display device manufacturer.

As can be seen from the plan view shown in FIG. 3B, a cell CELL is formed by the four partition particles 120 of the upper layer, and since there is little gap between the cells, the cell is not only suitable for high definition but also implements color color. If desired, since only one color charged particle is injected into each cell, there is an advantage that the number of external additives used to equalize the charging property between each color charged particle is not limited. For example, in the past, color charged particles and black (or white) charged particles were injected together in one cell, so that the external additives used for the respective colored charged particles were limited by the charging characteristics of the black charged particles. However, the present invention is used to make the charging characteristics of the external additives limited by the conventional black charged particles, that is, the colored charged particles injected into each cell, because only the partition particles of the background color and one charged particle are injected. The number of external additives increases, and therefore, it can be convenient for producing colored charged particles.

In addition, the partition particle 120 may be made by polymerizing a liquid polymer material, which will not be described since it is obvious to a person having ordinary skill in the art.

In addition, the charged particles 130 are not injected with both positive and negative (+,-) charged particles as in the conventional reflective electronic paper display device, but because the partition particles 120 have a background color, the positive (+) or Only one of the negative (−) charged particles is injected, and the size of the charged particles 130 is large enough to pass between the partition walls 120 of the two-layer structure.

Then, the manufacturing process of the reflective electronic paper display device of the present invention having the above structure will be described with reference to the procedure cross-sectional view shown in FIG.

First, a transparent electrode of ITO (Indium-Tin-Oxide) or a conductive polymer is coated on the transparent lower substrate 100 of glass or plastic, and the lower electrode 110 is formed by etching (FIG. 4A).

The barrier substrate 120 is formed in a two-layer structure to maintain a constant gap between the upper substrate 140 and the lower substrate 100 to be attached later on the structure, and to function as a partition wall for separating the cells from the cells ( 4b). In this case, the partition particle 120 is applied to maintain the distance between the lower electrode 110, the partition particle 120 of the two-layer structure is polycarbonate (polycarbonate), polyester (PET), high purity acrylic resin (PMMA) It is manufactured by using a polymer material such as, and the like is coated on the lower structure in a two-layer structure and then the partition particle 120 of the coated two-layer structure is attached to the lower structure. Here, as an example of a method of attaching the partition wall particles 120 to the lower structure, the partition wall particles 120 may be attached by a method of applying a predetermined heat. In addition, as can be seen in the plan view shown in FIG. 3B, the partition particles 120 of the two-layer structure can be seen that the partition particles 120 of the upper layer and the lower layer are staggered from each other. That is, the barrier rib particles 120 of the lower layer are positioned at the cell (CELL) position formed by the four upper barrier rib particles 120. In addition, another example of the method of forming the partition wall particle 120 of the bilayer structure may be formed by a photonic crystal, which is obvious to those skilled in the art, Since the summary of this invention can be distracted, it is not demonstrated.

Then, the charged particles 130 are injected into the cells formed by the partition particles 120 using corona discharge, triboelectric charge, spray coating, or laser printer method. In this case, in order to prevent the charged particles 130 injected into the cell from being attached to the upper partition wall particles 120, the mask 160 is positioned on the upper partition wall particles 120, and then the charged particles 130 are placed in the cell. It is injected into (FIG. 4C).

Next, the upper electrode 150 is formed by coating / etching a transparent electrode of ITO or a conductive polymer on the upper substrate 140, and the upper structure on which the upper electrode 150 is formed is formed by the partition particle 120. It is attached to the upper portion of the partition wall particles 120 of the upper layer formed on the lower substrate structure so as to face the cell (FIGS. 4D to 4E). Through such a process, the reflective electronic paper display device of the present invention can be manufactured.

In addition, when the liquid material needs to be filled between the partition particles 120 during the above process, the charged particles 130 may be injected, and then a predetermined liquid material (for example, dielectric liquid) may be injected. The liquid substance can be determined by the manufacturer.

As can be seen in the manufacturing process of the present invention, since the cell is formed by using the partition particles of the two-layer structure without using the partition wall, the cell and the cell can not be a large gap, it is possible to implement a high-definition cell, The overall sharpness can be kept constant, which has the advantage of improving image quality.

As described in detail above, the present invention forms a barrier rib particle in a two-layer structure to maintain a constant gap between the upper substrate and the lower substrate, and injects charged particles for expressing color into a cell formed by four upper barrier rib particles. This has the effect of improving high definition and image quality.

Claims (9)

Upper and lower substrates formed of any one of plastic and glass; Upper and lower electrodes formed on the upper and lower substrates by applying driving voltages of the devices, and formed of transparent electrodes; Barrier rib particles having a constant gap between the upper and lower substrates and formed in a two-layer structure; A reflective electronic paper display device comprising: charged particles injected into a cell formed by the partition particles. The reflective electronic paper display device according to claim 1, wherein the barrier particle is made of one of a polymer material of polycarbonate, polyester (PET), and high purity acrylic resin (PMMA). The reflective electronic paper display device according to claim 1, wherein lower partition walls are located at a cell position formed by the four upper partition walls. The reflective electronic paper display device according to claim 1, wherein the partition particles are filled with air or a dielectric liquid. Forming a lower electrode on the lower substrate and forming partition particles of a two-layer structure on the structure; Injecting charged particles for expressing color into a cell region formed by the partition particles; Forming an upper electrode on the upper substrate, and attaching the upper structure on which the upper electrode is formed to face the cell formed by the partition particles, and attaching the upper electrode to the upper partition wall particles formed on the lower substrate structure. Method of manufacturing a reflective electronic paper display device. The method of claim 5, wherein the partition particles of the two-layer structure formed on the lower substrate structure are attached onto the lower substrate by a predetermined row. The method of manufacturing a reflective electronic paper display device according to claim 5, wherein the partition particles of the two-layer structure are formed by photonic crystals. The method of claim 5, wherein the charged particles to be injected into the cell region is placed by the lattice mask on top of the upper partition wall particles, the reflection is characterized in that the injection by one of the corona discharge, triboelectric charge, spray coating, laser printer method. Type electronic paper display device manufacturing method. The method of claim 5, further comprising: injecting a dielectric liquid between the partition particles after the charged particles are injected into the cell region.

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