KR101153583B1 - Electronic paper display device and manufacturing Electronic paper display device and manufacturing method thereof method thereof - Google Patents

Abstract

The present invention relates to an electronic paper display device and a manufacturing method thereof, wherein the electronic paper display device includes: a first substrate having a receiving portion formed by a plurality of partition walls; A rotating body disposed in the receiving portion and having electrical and optical anisotropy; And a second substrate covering the accommodating part and the rotating body and made of a light transmissive material. In the electronic paper display device according to the present invention, the rotating bodies are densely arranged within a thin thickness, so that the contrast ratio is improved, and the driving voltage is relatively low.

Bulkhead, receptacle, rotor, electronic paper, display device.

Description

Electronic paper display device and manufacturing method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic paper display device and a manufacturing method thereof, and more particularly, to an electronic paper display device having a single layer structure having a high contrast ratio and a low driving voltage, and a manufacturing method thereof.

In response to today's information society, which requires a new paradigm, a major transformation is required in the way information is delivered and shared. In order to meet this, as the flexible display, the development of the technology of electronic paper, which has a bendable advantage, is being accelerated, and the development of the electronic paper technology is entering the commercial development stage.

Electronic paper is cheaper to produce than conventional flat display panels, and can be driven with very little energy because it does not require background lighting or continuous recharging like a normal screen. In addition, the electronic paper is very sharp, has a wide viewing angle, and has a memory function that does not completely disappear even in the absence of power. These advantages make it possible for electronic paper to be used in a wide range of applications such as e-books with paper-like sides and moving illustrations, self-renewable newspapers, reusable paper displays for mobile phones, disposable TV screens and electronic wallpaper. It has a huge potential market.

There are four main approaches to electronic paper implementation: twisted ball method that rotates spherical particles composed of upper and lower hemispheres with opposite charges and different colors using an electric field, colored charge mixed with oil. Electrophoresis method that traps particles in a microcapsule or microcup, or allows charged particles to respond to the application of an electric field; QR-LPD (Quick Response-Liquid Power Display) method using cholesteric liquid crystal molecules The cholesteric liquid crystal display system using the selective reflection characteristic of the.

In the twisted ball method, the inside of the cell is filled with a transparent medium, and in the transparent medium, twist balls colored with opposite colors and different colors, for example, black and white, are disposed. When a voltage is applied to the twist ball, the twist ball is rotated such that polarities of the charged charges are applied so that opposite polarities face toward the front side in accordance with the applied voltage direction, thereby displaying black and white.

In general, the twist balls are arrayed by a casting method, which is not fixed to the arrangement, and a high voltage is required to drive the twist balls.

The present invention has been made to solve the above technical problem, and an object thereof is to provide an electronic paper display device having a high contrast ratio and a low driving voltage and a manufacturing method thereof.

In order to solve the above problems, an embodiment of the present invention includes a first substrate having a receiving portion formed by a plurality of partitions; A rotating body disposed in the receiving portion and having electrical and optical anisotropy; And a second substrate covering the accommodating part and the rotating body and made of a light transmissive material. It provides an electronic paper display device comprising a.

The first substrate may be colored black or white.

A reflection film may be formed in the accommodation portion.

The first substrate or the second substrate is polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES), cyclic olefin polymer ( COC), polydimethylsiloxane (PDMS, polydimethylsiloxane) or may be made of polyurethane acrylate (PUA, poly urethane acrylate).

The partition wall may have a height equal to or greater than the diameter of the rotating body.

The partition wall may be integrally formed with the first substrate.

The rotating body may have two display regions colored in different colors and exhibiting different charging characteristics.

The rotating body may be spherical, elliptical or cylindrical.

The accommodation portion may have a shape corresponding to the shape of the rotating body.

Another embodiment of the present invention includes the steps of providing a first substrate having a plurality of partitions forming a receiving portion; Disposing a rotating body having electrical and optical anisotropy on the receiving portion; And forming a second substrate to cover the accommodating part and the rotor. It provides a method of manufacturing an electronic paper display device comprising a.

The first substrate may include coloring white or black.

The partition wall may be integrally formed with the first substrate.

The method may include forming a reflective film on the receiving portion.

The formation of the partition wall may be formed by an imprint, laser patterning, photolithography, or etching process.

The second substrate may be formed by injecting a fluid resin.

The electronic paper display device according to the present invention is composed of a single layer, and the rotors are densely arranged within a thin thickness.

As a result, the contrast ratio is improved, and the spacing between the electrodes can be made small, so that the driving voltage is relatively low.

In addition, the structure is such that the rotating body is disposed in the receiving portion formed by the partition wall, and there is little possibility that the rotating body exists at another position such as the partition wall, not the receiving portion. The stability and uniformity of the image is excellent.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity, and the elements denoted by the same reference numerals in the drawings are the same elements.

1 is a cross-sectional view schematically illustrating an electronic paper display device according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a rotating body according to an embodiment of the present invention.

Referring to FIG. 1, the electronic paper display device according to the present embodiment includes a first substrate 110, a rotating body 130, and a second substrate 120. In addition, electrodes (not shown) for applying a voltage to the rotating body 130 may be formed on the first substrate 110 and the second substrate 120.

In addition, the first substrate 110 and the second substrate 120 may be provided with an adjusting means for adjusting the magnitude and direction of the voltage applied to the rotating body 130.

The first substrate 110 has a plurality of partitions 111 and has a receiving portion H formed by the partitions. The rotor 130 is disposed in the accommodation portion (H).

The first substrate 110 may be made of a flexible resin. The resin is not limited thereto, for example, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES), ring Type olefin polymer (COC), polydimethylsiloxane (PDMS, polydimethylsiloxane) or polyurethane acrylate (PUA, poly urethane acrylate) and the like can be used. Polydimethylsiloxane (PDMS, polydimethylsiloxane) has a good adhesive force even when formed in a double with a time difference, preferably polydimethylsiloxane (PDMS, polydimethylsiloxane) can be used.

The first substrate 110 may be integrally formed with the partition wall 111. Specific formation method will be described later. The height of the partition 111 is preferably formed to be the same or smaller than the diameter of the rotating body 130. Although not limited thereto, for example, the thickness may be 80 to 120 μm. In addition, the thickness of the partition 111 is not limited thereto, but may be 20 to 30 μm.

In addition, the first substrate 110 may be colored white or black to improve the contrast ratio.

For example, titanium oxide (TiO ₂ ), carbon black, or the like may be mixed and colored with the resin material forming the first substrate.

In addition, a reflective film (not shown) may be formed in the accommodation portion H to improve the contrast ratio. After the partition wall 111 is formed on the first substrate 110, a reflective film may be formed using aluminum (Al) or silver (Ag) in the accommodation portion.

The rotating body 130 disposed in the accommodating part H has electrical and optical anisotropy. When a voltage is applied to the rotating body 130, polarities of charged codes applied according to the applied voltage direction act to each other. The opposite polarity is rotated to face the front to display black and white.

In addition, a cavity C filled with a dielectric liquid may be formed around the rotor to allow the rotor to easily rotate.

2 is a perspective view schematically showing an enlarged rotating body 130. Referring to FIG. 2, the rotating body 130 is colored in different colors and has two display regions 30a and 30b which exhibit different charging characteristics. The two display areas may be colored in different colors, the first display area 30a may be colored white, and the second display area 30b may be colored black. When the first display area 30a is charged with positive charge, the second display area 30b is charged with negative charge. When a voltage is applied to the rotating body 30, it rotates according to the magnitude and direction of the voltage and displays black or white color by the colored colors in the two display areas.

A method known in the art may be used to form the first and second display areas 30a and 30b by electrically and optically treating the rotating body 130. For example, a method of applying a centrifugal force to the rotating body after putting the rotating body into the rotating disk having two coloring liquids can be used.

The shape of the rotating body 130 is not particularly limited, and may be, for example, spherical, elliptical or cylindrical. In addition, the diameter of the rotating body 130 is not particularly limited, but may be, for example, 50 to 100㎛.

In the present embodiment, the case in which two display regions are formed on the surface of the rotating body 30 is described. However, the number of display regions may be three or more as necessary.

In addition, the display area may be colored in various colors other than black or white.

For example, the first display area 30a may be colored white, and the second display area 30b may be colored red, green, or blue. Accordingly, each rotating body may represent red, green, or blue.

The second substrate 120 is formed to cover the accommodating part H and the rotating body 130. The second substrate 120 may be made of a flexible resin. The resin is not limited thereto, for example, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES), ring Type olefin polymer (COC), polydimethylsiloxane (PDMS, polydimethylsiloxane) or polyurethane acrylate (PUA, poly urethane acrylate) and the like can be used. Polydimethylsiloxane (PDMS, polydimethylsiloxane) has a good adhesive force even when formed in a double with a time difference, preferably polydimethylsiloxane (PDMS, polydimethylsiloxane) can be used.

The second substrate 120 is provided as a display surface and is made of a light transmissive material.

According to this embodiment, it consists of a single layer and the rotor is densely arranged in thin thickness. As a result, the contrast ratio is improved, and the spacing between the electrodes can be made small, so that the driving voltage is relatively low.

3 is a cross-sectional view schematically showing an electronic paper display device according to another embodiment of the present invention. The components different from the above-described embodiments will be described mainly, and detailed descriptions of the same components will be omitted.

Referring to FIG. 3, the electronic paper display device according to the present embodiment includes a first substrate 210, a rotating body 230, and a second substrate 220.

The first substrate 210 has a plurality of partitions 211, and has a receiving portion H formed by the partitions. The rotor 130 is disposed in the accommodation portion (H).

The shape of the accommodation portion is not particularly limited, but the shape of the accommodation portion (H) may have a hemispherical shape. If the receiving portion (H) is a hemispherical shape, it is advantageous to accommodate this, when the rotating body is spherical.

That is, since the accommodating part H has a shape corresponding to the shape of the rotating body 230, the distance between the first substrate 210 and the first substrate 210 can be kept close, and the first substrate 110 is colored in black or white. If so, the contrast ratio can be improved.

Hereinafter, a method of manufacturing an electronic paper display device according to an embodiment of the present invention will be described.

4 to 7 are cross-sectional views illustrating processes of manufacturing an electronic paper display device according to an embodiment of the present invention.

First, the first substrate 110 is provided, and the partition wall 111 is formed to divide the space on the first substrate on the first substrate 110 to form a plurality of accommodation portions H.

The first substrate 110 and the partition 111 may be integrally formed.

For example, an imprint method using a stamp can be used. More specifically, after forming a resin layer having a predetermined thickness, the resin layer may be pressed with a stamp having an embossed and an intaglio pattern to form a first substrate having partitions and accommodating portions corresponding to the embossed and intaglio patterns of the stamp. . At this time, by adjusting the embossed and intaglio patterns of the stamp, it is possible to adjust the spacing of the partition and the shape and size of the receiving portion.

In addition, a method of forming a partition wall to form an accommodation part on the first substrate 110 may use methods such as laser patterning, photolithography, and etching.

In addition, the first substrate may be colored white or black. For example, titanium oxide (TiO ₂ ), carbon black, or the like may be mixed and colored with the resin material forming the first substrate.

In addition, a reflective film may be formed on the receiving portion H by using aluminum (Al) or silver (Ag).

Next, the rotating body 130 having electrical and optical anisotropy is disposed in the plurality of receiving portions H formed on the first substrate 110.

The rotating body 130 may be injected into the receiving part using a squeegee or the like. More specifically, it is possible to arrange the mask or filter to open only the receiving portion (H), it is possible to arrange the rotating body by means such as squeegee.

Next, as shown in FIGS. 5 and 6, the second substrate 120 is formed to cover the accommodating part H of the first substrate 110 and the rotating body 130 disposed in the accommodating part. do.

More specifically, the first substrate 110 is disposed in a frame T having a height equal to or greater than that of the partition wall 111 formed on the first substrate 110. Thereafter, a flowable resin is injected into the mold T. Thereafter, the flowable resin is cured under a constant temperature and a predetermined time, and then the mold T is removed. For example, when using the said flowable resin roll PDMS, a hardening process is completed when it is about 24 hours at room temperature, about 4 hours at 70 degreeC, about 1 hour at 100 degreeC, and about 15 minutes at 150 degreeC.

Next, as shown in FIG. 7, when the second substrate is cured, it is immersed in a dielectric liquid to form a cavity. In other words, the dielectric fluid penetrates around the rotating body to form the cavity while surrounding the rotating body.

In addition, although not shown, an electrode may be formed to face each other on the first substrate and the second substrate.

It is intended that the invention not be limited by the foregoing embodiments and the accompanying drawings, but rather by the claims appended hereto. Accordingly, various forms of substitution, modification, and alteration may be made by those skilled in the art without departing from the technical spirit of the present invention described in the claims, which are also within the scope of the present invention. something to do.

1 is a cross-sectional view schematically showing an electronic paper display device according to an embodiment of the present invention.

2 is an enlarged perspective view of a rotating body according to an embodiment of the present invention.

3 is a schematic cross-sectional view of an electronic paper display device according to another embodiment of the present invention.

4 to 7 are cross-sectional views of processes for explaining a method of manufacturing an electronic paper display device according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110: first substrate 111: partition wall

120: second substrate 130: rotating body

Claims (15)

A first substrate having a receiving portion formed by a plurality of partition walls; A rotating body disposed in the receiving portion and having electrical and optical anisotropy; And And a second substrate covering the accommodating part and the rotating body and made of a light transmissive material. And the second substrate includes the rotating body therein. The method of claim 1, And the first substrate is colored black or white. The method of claim 1, An electronic paper display device, characterized in that the reflection portion is formed in the receiving portion. The method of claim 1, The first or second substrate is polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES), cyclic olefin Electronic paper display device, characterized in that made of a polymer (COC), polydimethylsiloxane (PDMS, polydimethylsiloxane) or polyurethane acrylate (PUA, polyurethane acrylate). The method of claim 1, The height of the partition wall is less than or equal to the direct line of the rotating body electronic paper display device. The method of claim 1, And the partition wall is integrally formed with the first substrate. The method of claim 1, And said rotating body has two display regions colored in different colors and exhibiting different charging characteristics. The method of claim 1, And the rotating body is spherical, elliptical or cylindrical. The method of claim 1, And the housing portion has a shape corresponding to that of the rotating body. Providing a first substrate having a plurality of partitions forming a receiving portion; Disposing a rotating body having electrical and optical anisotropy on the receiving portion; And Forming a second substrate covering the accommodating portion and the rotatable body and including the rotatable body therein by contact with the accommodating portion by injecting a fluid resin; Method of manufacturing an electronic paper display device comprising a. The method of claim 10, And the first substrate is colored in white or black. The method of claim 10, And the partition wall is formed integrally with the first substrate. The method of claim 10, Forming a reflective film on the housing portion. The method of claim 10, The barrier rib is formed by an imprint, laser patterning, photolithography, or etching process. A first substrate having a receiving portion formed by a plurality of partition walls; A rotating body disposed in the receiving portion and having electrical and optical anisotropy; And And a second substrate covering the accommodating part and the rotating body and made of a light transmissive material. And the second substrate is in contact with the accommodation portion.

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