KR20110015931A - Electrophoretic display - Google Patents

Electrophoretic display Download PDF

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Publication number
KR20110015931A
KR20110015931A KR1020090073386A KR20090073386A KR20110015931A KR 20110015931 A KR20110015931 A KR 20110015931A KR 1020090073386 A KR1020090073386 A KR 1020090073386A KR 20090073386 A KR20090073386 A KR 20090073386A KR 20110015931 A KR20110015931 A KR 20110015931A
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KR
South Korea
Prior art keywords
array
upper array
sealant
area
electrophoretic
Prior art date
Application number
KR1020090073386A
Other languages
Korean (ko)
Inventor
박성진
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020090073386A priority Critical patent/KR20110015931A/en
Publication of KR20110015931A publication Critical patent/KR20110015931A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0102—Constructional details, not otherwise provided for in this subclass
    • G02F1/0107—Gaskets, spacers or sealing of cells; Filling and closing of cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The present invention relates to an electrophoretic display.

The electrophoretic display includes an upper array having an electrophoretic film; A lower array bonded to one surface of the upper array with the electrophoretic film interposed therebetween; A sealant encapsulating the upper array and the lower array; And an antistatic portion formed on the lower array to be positioned below the sealant.

Description

Electrophoretic Display {Electrophoretic Display}

The present invention relates to an electrophoretic display.

Conventional electrophoretic display (EPD) is excellent in flexibility and portability, and has electrophoresis (light electrophoresis) in which the charged particles move toward the anode or cathode in the electric field. It is a kind of flat panel display used.

The electrophoretic display device forms a thin film transistor array on a thin, bendable base film such as paper or plastic, and drives the electrophoretic floating particles by a vertical electric field between the pixel electrode of the thin film transistor array and the common electrode opposite thereto. It is a display device that is also expected as a next generation electronic paper as a display.

The electrophoretic display includes a lower array 10, an upper array 20, a protective sheet 30, and a sealant 40 as shown in FIG. 1.

The lower array 10 includes a pixel portion 14 and an antistatic portion 16 formed on the base substrate 12. The pixel portion 14 includes a plurality of data lines and gate lines, thin film transistors (hereinafter referred to as TFTs) formed at respective crossing regions thereof, and a plurality of pixels connected to TFTs, respectively. Electrodes. The static electricity prevention unit 16 includes a plurality of static electricity protection elements for discharging static electricity applied from the outside.

The upper array 20 is an electrophoretic film 24 composed of a common electrode 22 formed on a base film, a plurality of capsules 26 positioned on the common electrode 22 and having charged pigment particles. ). The charged dye particles of the electrophoretic film 24 are driven by a potential difference between the common voltage applied to the common electrode 22 and the pixel voltage applied to the pixel electrode to realize black or white.

Protective sheet 30 and sealant 40 protect upper array 20 from moisture or ultraviolet light. The protective sheet 30 is formed larger than the upper array 20 while smaller than the lower array 10. The sealant 40 is filled in the side space formed by the adhesion of the upper and lower arrays 10 and 20 and the protective sheet 30.

Recently, as the advantages of the electrophoretic display, such as light weight, thin, low power consumption, and eye comfort are known to the public, the interest has increased greatly, but many changes are required for a better implementation. This reduces the bezel area BZA which is much wider than that of the LCD. The electrophoretic display can be largely divided into an effective display area AA for displaying an image and a non-display area SA outside the effective display area AA. The bezel area BZA is a non-display area SA. It indicates an area disposed outside the board area BA among the. The bezel area BZA is divided into a first area BZA1 through which the upper array 20 extends to cover the antistatic part 16, and a second area BZA2 filled with the sealant 40.

In order to reduce the bezel area BZA, a method of reducing the first area BZA1 or the second area BZA2 may be considered. The second area BZA2 is directly related to product reliability problems such as moisture penetration and ultraviolet damage. It is practically difficult to reduce this area BZA2. Therefore, reducing the first area BZA1 may be the biggest improvement at present. However, in the conventional electrophoretic display, reducing the first area BZA1 is also impossible for the following reasons.

In the structure of the conventional electrophoretic display device, the antistatic portion 16 formed on the base substrate 12 is positioned below the upper array 20 in the first region BZA1. Thus, if the distance D between the antistatic portion 16 and the edge of the upper array 20 is not sufficiently secured and the antistatic portion 16 touches the edge of the upper array 20, driving Defects will occur. The driving failure is that the residues (crumbs) of the common electrode 22 generated during the cutting of the upper array 20 may prevent the static electricity from the antistatic portion 16 during the adhesion process of the upper array 20 and the lower array 10. It is caused by the cause of short and defective. In order to prevent this, the upper array 20 must be designed to completely cover the antistatic part 16, so as to sufficiently secure a gap D between the antistatic part 16 and the edge of the upper array 20. Therefore, in the conventional structure, an inevitably large upper array 20 should be used, which makes it impossible to reduce the first region BZA1.

As a result, it is difficult to reduce the bezel width BZA in the conventional electrophoretic display.

Accordingly, an object of the present invention is to provide an electrophoretic display device capable of reducing the bezel width.

In order to achieve the above object, an electrophoretic display device according to an embodiment of the present invention comprises an upper array having an electrophoretic film; A lower array bonded to one surface of the upper array with the electrophoretic film interposed therebetween; A sealant encapsulating the upper array and the lower array; And an antistatic portion formed on the lower array to be positioned below the sealant.

And a protective sheet attached to the other surface of the upper array opposite to the one surface, the protective sheet being smaller than the lower array and larger than the upper array.

The sealant is filled in a space formed by the bonding of the protective sheet, the upper array and the lower array.

The antistatic portion is spaced apart from the edge of the upper array by a predetermined distance.

Electrodes for driving capsules of the electrophoretic film are formed in each of the upper array and the lower array.

The electrophoretic display includes: an effective display area for driving the capsules according to voltages applied to the electrodes to display an image; And a bezel area positioned outside the effective display area, wherein the edge of the upper array and the sealant are formed.

The electrophoretic display device further includes a board area positioned between the effective display area and the bezel area.

The electrophoretic display according to the present invention can reduce the overall bezel width by reducing the size of the upper array by changing the position of the antistatic portion from the lower portion of the upper array to the lower portion of the sealant.

Furthermore, the electrophoretic display device according to the present invention can effectively prevent damage or deformation of the antistatic elements by external force by changing the position of the antistatic portion from the lower portion of the upper array to the lower portion of the sealant.

Furthermore, the electrophoretic display device according to the present invention is very easy to change the design by changing to the lower portion of the sealant which does not require any additional margin according to the position change in changing the position of the antistatic part.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6.

2 is a plan view showing an electrophoretic display device according to an exemplary embodiment of the present invention as a whole. 3 is a plan view illustrating a part of FIG. 2, and FIG. 4 is a cross-sectional view of FIG. 2 taken along line II ′.

2 to 4, an electrophoretic display according to an exemplary embodiment of the present invention includes a lower array 110, an upper array 120, a protective sheet 130, and a sealant 140.

The lower array 110 includes a pixel portion 114 and an antistatic portion 116 formed on the base substrate 112. The base substrate 112 is made of flexible plastic, easily bent film, or flexible metal or glass. The pixel portion 114 includes a plurality of data lines and gate lines, TFTs formed at respective crossing regions thereof, and a plurality of pixel electrodes connected to the TFTs, respectively. The TFT includes a gate electrode connected to the gate line, a source electrode connected to the data line, and a drain electrode connected to the pixel electrode. The antistatic unit 116 includes a plurality of static protection circuits for discharging static electricity applied from the outside. The antistatic part 116 is located in an area filled with the sealant 140 unlike the related art.

The upper array 120 includes a common electrode 122 formed on a base film which is easily bent, and an electrophoretic film 124 positioned on the common electrode 122. The common electrode 122 is a transparent conductive material through which light can pass, such as indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), SnO2, Amorphous-indium tin oxide (a-ITO) or the like. The electrophoretic film 124 includes a plurality of capsules 126 containing charged dye particles. Each of the capsules 126 includes black dye particles 126a responding to a positive voltage (or negative voltage), white dye particles 126b reacting to a negative voltage (or positive voltage), and a solvent 126c. ) Is provided. The electrophoretic film 124 may further include an upper protective layer and a lower protective layer for protecting the capsules 126 as well as preventing the flow of the capsules 126 at the upper and lower interfaces with the capsules 126, respectively.

The lower array 110 and the upper array 120 are adhered so that the common electrode 122 and the pixel electrode face each other vertically with the electrophoretic film 124 interposed through a hot laminating process using a pressure roller. .

The protective sheet 130 adheres on the opposite display surface not facing the lower array 110 in the upper array 120 through a hot laminating process using a pressure roller to protect the upper array 120 from moisture or ultraviolet rays. do. The protective sheet 130 is formed larger than the upper array 120 but smaller than the lower array 110.

The sealant 140 is filled in an edge space formed by the bonding of the upper and lower arrays 110 and 120 and the protective sheet 130 to encapsulate the lower array 110 and the upper array 120, thereby preventing display from moisture or ultraviolet rays. To protect. The sealant 140 may be made of a thermosetting resin or an ultraviolet curable resin.

In the electrophoretic display having the above configuration, the pixel voltage signal supplied to the data line is charged to the pixel electrode through the channel of the TFT in response to the gate voltage supplied to the gate line of the lower array 110, and the upper array 120 is provided. When the common voltage is supplied to the common electrode 122, the white dye particles 126b and the black dye particles 126a in the capsule 126 may be divided into black or white by the electrophoretic phenomenon caused by an electric field. It becomes possible.

Such an electrophoretic display has an effective display area AA 'for displaying an image and a non-display area SA' outside the effective display area AA '. The non-display area SA 'includes a board area BA' formed along an interface with the effective display area AA 'and a bezel area outside the board area BA' to secure a process margin when the system is fastened. BZA '). The bezel area BZA 'is a first area BZA1' where an edge of the upper array 120 is formed, and a second area where the sealant 140 is filled outside the first area BZA1 '. Subdivided into (BZA2 '). Unlike the conventional technology in which the antistatic part 116 is spaced apart from the edge of the upper array 120 by a predetermined distance and positioned in the first region BZA1 ′, the edge of the upper array 120 is in the present invention. It is located in the second area BZA2 'spaced apart from the predetermined interval D'. Therefore, according to the present invention, the upper array 120 does not need to be large to cover the antistatic portion 116. That is, in the first region BZA1 ', it is not necessary to consider the distance between the antistatic portion 116 and the edge of the upper array 120, so that the size of the first region BZA1' may be reduced. It is possible. When the size of the first area BZA1 'is reduced, the bezel area BZA' is reduced by that much.

Meanwhile, in the second region BZA2 ', the distance D' between the antistatic portion 116 and the edge of the upper array 120 must be sufficiently secured as in the related art, but the second region BZA2 ' Since the size of is generally designed to have a sufficient design margin in consideration of product reliability issues, it is possible to secure the predetermined interval D 'sufficiently without considering additional margin. In addition, since the second region BZA2 ′ is a portion filled with the sealant 140, damage or deformation of the antistatic portion 116 may be more effectively prevented from the influence of the external force.

5 and 6 show that the bezel area BZA 'is reduced by reducing the size of the upper array 120 as compared with the conventional art.

In the prior art, as shown in FIGS. 5A and 6A, the antistatic part 16 is spaced apart from the edge of the upper array 20 by a predetermined distance D to the first region BZA1. Located. In contrast, as shown in FIGS. 5B and 6B, the present invention is positioned in the second region BZA2 'spaced apart from the edge Edge of the upper array 120 by a predetermined distance D'. . Therefore, according to the present invention, since the distance between the antistatic portion 116 and the edge of the upper array 120 is not required to be considered in the first region BZA1 ', the size of the upper array 120 may be any number. Can be reduced. If the size of the upper array 120 is reduced, the size of the first region BZA1 ′ is reduced by that amount. If the size of the first region BZA1 'is reduced, the bezel region BZA' is reduced by that amount.

As described above, the electrophoretic display according to the present invention can reduce the overall bezel width by reducing the size of the upper array by changing the position of the antistatic portion from the lower portion of the upper array to the lower portion of the sealant.

Furthermore, the electrophoretic display device according to the present invention can effectively prevent damage or deformation of the antistatic elements by external force by changing the position of the antistatic portion from the lower portion of the upper array to the lower portion of the sealant.

Furthermore, the electrophoretic display device according to the present invention is very easy to change the design by changing to the lower portion of the sealant which does not require any additional margin according to the position change in changing the position of the antistatic part.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a cross-sectional view showing a conventional electrophoretic display device.

2 is a plan view showing the electrophoretic display according to the embodiment of the present invention as a whole.

3 is a plan view showing a portion of FIG. 2;

4 is a cross-sectional view taken along the line II ′ of FIG. 2.

5 and 6 are a plan view and a cross-sectional view of a conventional bezel area is reduced by reducing the size of the upper array, respectively.

<Description of Symbols for Main Parts of Drawings>

110: lower array 112: base substrate

114: pixel portion 116: antistatic portion

120: upper array 122: common electrode

124: electrophoretic film 126: capsule

130: protective sheet 140: sealant

Claims (7)

An upper array having an electrophoretic film; A lower array bonded to one surface of the upper array with the electrophoretic film interposed therebetween; A sealant encapsulating the upper array and the lower array; And And an antistatic portion formed on the lower array so as to be positioned below the sealant. The method of claim 1, And a protective sheet attached to the other surface of the upper array opposite to the one surface, the protective sheet being smaller than the lower array and larger than the upper array. The method of claim 2, And the sealant is filled in a space formed by the bonding of the protective sheet, the upper array and the lower array. The method of claim 4, wherein And the antistatic portion is spaced apart from the edge of the upper array by a predetermined distance. The method of claim 1, And an electrode for driving the capsules of the electrophoretic film is formed in each of the upper array and the lower array. The method of claim 5, The electrophoretic display device, An effective display area for driving the capsules according to the voltages applied to the electrodes to display an image; And And a bezel area positioned outside the effective display area, the edge of the upper array and the sealant formed thereon. The method of claim 6, And a board area located between the effective display area and the bezel area.
KR1020090073386A 2009-08-10 2009-08-10 Electrophoretic display KR20110015931A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160094520A (en) * 2015-01-30 2016-08-10 하이디스 테크놀로지 주식회사 Electrophoretic display and method for manufacturing the display

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160094520A (en) * 2015-01-30 2016-08-10 하이디스 테크놀로지 주식회사 Electrophoretic display and method for manufacturing the display

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