KR20120140393A - Black matrix composition and touch panel display device comprising of the same - Google Patents

Black matrix composition and touch panel display device comprising of the same Download PDF

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KR20120140393A
KR20120140393A KR1020110060103A KR20110060103A KR20120140393A KR 20120140393 A KR20120140393 A KR 20120140393A KR 1020110060103 A KR1020110060103 A KR 1020110060103A KR 20110060103 A KR20110060103 A KR 20110060103A KR 20120140393 A KR20120140393 A KR 20120140393A
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South Korea
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black matrix
organic pigment
pigment
carbon black
touch panel
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KR1020110060103A
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Korean (ko)
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최추지
김진욱
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엘지디스플레이 주식회사
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Publication of KR20120140393A publication Critical patent/KR20120140393A/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C08L101/005—Dendritic macromolecules
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Human Computer Interaction (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

A black matrix composition according to one embodiment of the present invention is a black matrix composition comprising a binder, a photoinitiator, a surfactant, a pigment and a solvent, wherein the pigment comprises carbon black and an organic pigment, And the organic pigment may be included in an amount of 10 to 20 parts by weight based on the total solid component.

Description

TECHNICAL FIELD [0001] The present invention relates to a black matrix composition and a touch panel display device including the black matrix composition.

The present invention relates to a black matrix composition and a touch panel display device including the same.

2. Description of the Related Art In recent years, various input devices such as a keyboard, a mouse, a trackball, a joystick, and a digitizer have been used to configure an interface between a user and a home appliance or various information communication devices. However, the use of the above-described input device has a drawback in that it is required to learn how to use it and occupies a space, which makes it difficult to improve the completeness of the product. Therefore, there is a growing demand for an input device that is convenient and simple and can reduce malfunctions. In accordance with such a demand, a touch panel has been proposed in which a user directly touches the screen with a hand or a pen to input information.

The touch panel is simple, has little malfunction, can be input without using a separate input device, and can be applied to various display devices because of convenience that the user can quickly and easily operate the contents displayed on the screen have. Two transparent electrodes spaced apart from each other are formed on the touch panel to sense a user's touch by a resistance film or a capacitance type. However, since the transmissivity of the transparent electrodes is not 100%, light emitted from the display devices is lost .

The touch panel can be applied to various display panels. The liquid crystal display device includes a thin film transistor array substrate on which a light source, a thin film transistor and a pixel electrode are formed, and a liquid crystal layer interposed between the color filter and the color filter substrate on which the black matrix is formed. Layer. Here, the black matrix has a problem in that the thin film transistor is shielded from the leakage current by irradiation with light, but does not remove all the leakage current and also reduces the aperture ratio.

Accordingly, the liquid crystal display device to which the touch panel is applied has a problem that the aperture ratio is low due to the transparent electrode of the touch panel and the black matrix formed on the color filter substrate.

The present invention provides a black matrix composition capable of improving the aperture ratio of a touch panel display device and blocking a leakage current of the thin film transistor, and a touch panel display device including the black matrix composition.

In order to achieve the above object, a black matrix composition according to an embodiment of the present invention is a black matrix composition comprising a binder, a photoinitiator, a surfactant, a pigment and a solvent, wherein the pigment includes carbon black and an organic pigment , The carbon black is contained in an amount of 20 to 30 parts by weight based on the total solid component, and the organic pigment may be included in an amount of 10 to 20 parts by weight based on the total solid component.

The content ratio of the carbon black to the organic pigment may be 1: 2 to 1: 6.

The organic pigment may be at least one organic pigment selected from red, green and blue.

The black matrix composition may further include a crosslinking agent and an additive.

A touch panel display device according to an embodiment of the present invention includes a thin film transistor array substrate on which pixel electrodes and a black matrix are formed, a display panel on which a liquid crystal layer is interposed between the color filter substrates, Wherein the black matrix is formed from a black matrix composition comprising a binder, a photoinitiator, a surfactant, a pigment and a solvent, wherein the pigment comprises carbon black and an organic pigment The carbon black is contained in an amount of 20 to 30 parts by weight based on the total solid component, and the organic pigment may be included in an amount of 10 to 20 parts by weight based on the total solid component.

The black matrix may be formed on the thin film transistor of the thin film transistor array substrate.

The content ratio of the carbon black to the organic pigment may be 1: 2 to 1: 6.

The organic pigment may be at least one organic pigment selected from red, green and blue.

The transparent electrodes include a conductive material, and the conductive material may be at least one selected from PEDOT: PSS, CNT, Ag nanoparticles, and Cu nanoparticles.

The black matrix may exhibit a sheet resistance of 10 13 Ω / sq or more.

The black matrix may exhibit an optical density of 2 to 2.5 / 占 퐉.

The pixel electrode and the black matrix may be located on the same layer.

The black matrix composition and the touch panel display device including the black matrix composition of the present invention have advantages of simultaneously realizing high transmittance and low sheet resistance by forming a nano-mesh transparent electrode as a transparent electrode of a touch panel.

Further, the black matrix made of the black matrix composition of the present invention has excellent optical density, and is formed on the thin film transistor of the display device, so that the light irradiated to the thin film transistor can be effectively blocked. By having a dielectric constant of 10 or less, there is an advantage that it is possible to prevent the electrical characteristics of the thin film transistor from deteriorating even if it is formed on the thin film transistor.

1 and 2 show a touch panel display device according to an embodiment of the present invention.
3 is a view showing a nano-mesh transparent electrode of a touch panel.
FIG. 4A is a graph illustrating the optical density of a black matrix manufactured according to an experimental example of the present invention, and FIG. 4B is a graph illustrating a dielectric constant of a black matrix manufactured according to an experimental example of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is directed to a display device comprising a black matrix composition and a black matrix made therefrom. The black matrix composition according to one embodiment of the present invention is used in a touch panel display device and may include a binder, a crosslinking agent, a photoinitiator, an adhesion promoter, a surfactant, a pigment, and a solvent. Among these, the binder, crosslinking agent, photoinitiator, adhesion promoter, surfactant and pigment, which are solid components, may be contained in an amount of 10 to 50 parts by weight based on the total composition.

The binder may be at least one selected from an acrylic resin, a polyimide resin, a phenol resin, and a cardade resin. These resins may be compounds containing an acid group or an epoxy group. Preferably, an epoxy acrylate resin can be used.

The cross-linking agent may be a polyfunctional monomer, and may be an acrylate-based monomer. For example, there may be mentioned ethylene glycol diacrylate, triethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, propylene glycol diacrylate, 1,4-cyclohexanediol diacrylate, Trimethylol propane triacrylate, trimethylol propane triacrylate, trimethylol propane triacrylate, trimethylol propane triacrylate, trimethylol propane triacrylate, pentaerythritol triacrylate, tetraethylene glycol diacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, sorbitol triacrylate, sorbitol tetra Acrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, trimethylolpropane triacrylate, , 1,3-butanediol dimethacrylate , Pentaerythritol trimethacrylate, bis [p- (3-methacryloxy-2-hydroxy-propoxy) phenyl] dimethylmethane, Bis [p- (methacryloxy-epoxy) phenyl] dimethylmethane, sorbitol trimethacrylate, sorbitol tetramethacrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2- , Dimethylaminoethyl acrylate, diethylaminoethyl acrylate, isobornyl acrylate, n-vinyl pyrrolidone, 1,4-butylene glycol diacrylate, 1,6-hexanediol diacrylate, diethylene glycol Diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, polyethylene glycol diacrylate, pentaerythritol diacrylate, dipentaerythritol hexacrylate, Diacrylate, pentaerythritol tetraacrylate, vinyl acetate, triallyl cyanurate and the like. In addition to these monomers, prepolymers such as dimers and trimers can also be effectively used have.

The photoinitiator may be one or more selected from the group consisting of an acetophenone-based compound, a nonimidazole-based compound, a triazine-based compound, and a oxime-based compound, Can be used. The photoinitiator may be, for example, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4-isopropylphenyl) -2- - (2-hydroxyethoxy) -phenyl- (2-hydroxy-2-propyl) ketone, 1-hydroxycyclohexyl phenyl ketone, benzoin methyl ether, benzoin ethyl ether, benzoin isobutyl ether, 2-methyl-2- (4-methylthio) phenyl-2-morpholino-1-propan-1-one, 2-benzyl- Amino-1- (4-morpholinophenyl) -butan-1-one, 2- (4-bromo-benzyl- , 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one, 2,2- Tetraphenylbiimidazole, 2,2'-bis (o-chlorophenyl) -4,4 ', 5,5'-tetrakis (3,4,5-trimethoxyphenyl) Imidazole, 2,2'-bis (2,3-dichlorophenyl) -4,4 ', 5,5'-tetraphenylbiimidazole, 2,2'-bis (o- chlorophenyl) 4,4,5,5'-tetraphenyl-1,2'-biimidazole, 3- {4- [2,4-bis (trichloromethyl) -s-triazin- Propionic acid, 1,1,1,3,3,3-hexafluoroisopropyl-3- {4- [2,4-bis (trichloromethyl) -s-triazin- } Propionate, ethyl 2- {4- [2,4-bis (trichloromethyl) -s-triazine-6-yl] phenylthio} acetate, 2- (Trichloromethyl) -s-triazine-6-yl] phenylthio} acetate, cyclohexyl-2- {4- [ - phenyl] thio} acetate, benzyl-2- {4- [2,4-bis (trichloromethyl) -s-triazine- (Trichloromethyl) -s-triazin-6-yl] phenylthio} propionic acid, 3- {4- [2,4- Bis (trichloromethyl) -6-p-methoxystyryl-s-triazine, 2,4-bis (trichloromethyl) Triazine, 2-trichloromethyl-4-amino-6-p-methoxystyryl-s-triazine, (9-ethyl) -6- (2-methylbenzoyl-3-yl) -1,2,3,4-tetrahydronaphthalene- -1- (o-acetyloxime) and the like can be used.

The adhesion promoter may be selected from the group consisting of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) -silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- 2-aminoethyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltriethoxysilane, 3- glycidoxypropylmethyldimethoxysilane, 2- 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, Methoxysilane and the like, and at least one selected from these may be used.

The surfactant improves the coating stability of the black matrix. For example, a polyether-dimethyl polysiloxane copolymer can be used.

Examples of the solvent include ethyleneglycol acetate, ethylcellosolve, propyleneglycol methyl ether acetate, ethyl lactate, polyethylene glycol, cyclohexanone, and propylene glycol methyl ether. Solvents, and may be used alone or in combination.

The pigment used in the present invention may be carbon black, which is a black pigment, for the purpose of shielding the black matrix. In order to lower the dielectric constant of the black matrix and improve the optical density, the pigment may further contain an organic pigment. The organic pigment may use at least one selected from among red, green and blue organic pigments. As the organic pigment, for example, carmine 6B, phthalocyanine green, phthalocyanine blue and the like can be used.

The carbon black is contained in an amount of 20 to 30 parts by weight based on the total solid component, and the organic pigment may be included in an amount of 10 to 20 parts by weight based on the total solid component. More preferably, the content ratio of the carbon black to the organic pigment may be 1: 2 to 1: 6. Here, when the content ratio of carbon black to organic pigment is 1: 2 or more, there is an advantage that the dielectric constant of the black matrix can be lowered and the optical density can be improved by the organic pigment. Further, when the content ratio of carbon black to organic pigment is 1: 6 or less, there is an advantage that the problem that the optical density is lowered can be prevented.

As described above, the black matrix composition according to an embodiment of the present invention may include a binder, a crosslinking agent, a photoinitiator, an adhesion promoter, a surfactant, a pigment, and a solvent. Among these, the binder, crosslinking agent, photoinitiator, adhesion promoter, surfactant and pigment, which are solid components, may be contained in an amount of 10 to 50 parts by weight based on the total composition. The solvent may be included in an amount of 50 to 90 parts by weight based on the total composition. In the present invention, in addition to the above composition, a small amount of additives such as leveling agents, antifoaming agents, plasticizers, dispersants, and dispersion preservatives may be added.

Hereinafter, a touch panel display device including a black matrix made of the black matrix composition according to one embodiment of the present invention will be described.

1 and 2 are views illustrating a touch panel display apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a touch panel display 100 according to an embodiment of the present invention includes a display panel 100 for displaying an image, a touch panel 300 And an adhesive layer 200 for bonding the display panel 100 and the touch panel 300 to each other.

The display panel 100 may be implemented as a liquid crystal display panel or an organic light emitting display panel, for example, as long as the display panel 100 is a display panel on which a black matrix is formed. Organic light emitting diode display device. Hereinafter, a case where the display panel 100 is implemented as a liquid crystal panel will be described as an example for convenience of explanation.

The liquid crystal panel 100 includes a liquid crystal layer 150 interposed between the thin film transistor array substrate 110 and the color filter substrate 160. More specifically, the thin film transistor array substrate 110 includes a gate line (not shown) and a data line (not shown) formed on the first substrate 115 so as to cross each other with the gate insulating film 120 therebetween, A thin film transistor (TFT) formed thereon, and a pixel electrode 140 formed in a cell region provided with the crossing structure.

The thin film transistor TFT includes a gate electrode 117 to which a gate voltage is supplied, a source electrode 127a connected to the data line, a drain electrode 127b connected to the pixel electrode 140, And an active layer 123 that overlaps the source electrode 127a and the drain electrode 127b and forms a channel between the source electrode 127a and the drain electrode 127b. The active layer 123 is formed to overlap the source electrode 127a and the drain electrode 127b and further includes a channel portion between the source electrode 127a and the drain electrode 127b. On the active layer 123, ohmic contact layers 125a and 125b for ohmic contact with the source electrode 127a and the drain electrode 127b are further formed.

The pixel electrode 140 is in contact with the drain electrode 127b through the via hole 133 which exposes the drain electrode 127b through the protective film 131 protecting the thin film transistor TFT.

The black matrix 135 is located on the top of the thin film transistor TFT and is located on the protective film 131 like the pixel electrode 140. The black matrix 135 prevents the light of the lower light source or external light from being incident on the active layer 123 of the thin film transistor TFT and prevents leakage current from occurring in the thin film transistor TFT. Then, instead of being located on the color filter substrate 160 in the related art, it is located in the thin film transistor array substrate 110 to improve the aperture ratio.

Particularly, when the black matrix 135 is disposed on the top of the thin film transistor TFT, the black matrix 135 should not affect the electrical action of the thin film transistor TFT. In the present invention, as shown in the following Experimental Example, a black matrix 135 is formed of a black matrix composition having a high resistance and a low dielectric constant. Therefore, there is an advantage that a black matrix which does not affect the electrical action of the thin film transistor (TFT) can be provided.

On the other hand, in the color filter substrate 160 opposed to the TFT array substrate 110, R, G, and B color filters 165 are formed for each pixel on the second substrate 163, The protective overcoat layer 167 covers the color filter 165. A counter electrode 169 is formed on the overcoat layer 167 to form an electric field with the pixel electrode 140 of the thin film transistor array substrate 110.

The liquid crystal panel 100 is formed by interposing a liquid crystal layer 150 between the thin film transistor array substrate 110 and the color filter substrate 160 having such a structure.

2, the touch panel 300 includes an upper transparent electrode 312, a lower transparent electrode 352 opposed to the upper transparent electrode 312, a lower substrate 351 supporting the lower transparent electrode 352, An upper substrate 310 supporting the upper transparent electrode 312, a dot spacer 354 interposed between the upper transparent electrode and the lower transparent electrodes 312 and 352 and a signal line 380 for outputting touch information Respectively.

The upper transparent electrode 312 is supported by the upper substrate 310 and the upper substrate 310 is formed of flexible plastic such as polymethylmethacrylate, polyamide, polyimide, And is made of at least one of polypropylene and polyurethane. The lower transparent electrode 352 is supported by the lower substrate 351 in opposition to the upper transparent electrode 312. The lower transparent electrode 352 is formed in the display region of the lower substrate 351. The lower substrate 351 is attached onto the liquid crystal panel 100 through the adhesive 200.

The upper transparent electrode 312 and the lower transparent electrode 352 are made of nano-mesh transparent electrodes. As shown in FIG. 3, the nano-mesh transparent electrode is a metal grid-type transparent electrode that imparts a pattern to the metal electrode to increase the transmittance. That is, when the metal electrode is finely patterned to form a nano-mesh, the transmittance increases and the high conductivity of the metal itself is maintained, thereby achieving high transmittance and low sheet resistance simultaneously.

The nano-mesh transparent electrode may be formed of a transparent conductive material, for example, indium tin oxide (ITO) or indium zinc oxide (IZO), and may be formed of a conductive material such as PEDOT: PSS , CNT, Ag nanoparticles, and Cu nanoparticles to further improve the conductivity. The nano-mesh transparent electrode can be formed by a printing method such as a relief printing, a concave printing, a flat-offset printing, a dry offset printing, a flexographic printing, a stencil-screen printing, an inkjet printing and the like. In addition, the upper transparent electrode 312 and the lower transparent electrode 352 may be formed as a uniform thin film over the entire display area, and may have a pattern of a predetermined type, for example, a stripe type, depending on the case .

The dot spacer 354 maintains the gap between the upper transparent electrode 312 and the lower transparent electrode 352 to prevent current flow between the upper transparent electrode 312 and the lower transparent electrode 352 in the non-touch state, thereby increasing the touch sensitivity. The dot spacers 354 may be formed on the surface of the upper transparent electrode 312 or on the surface of the lower transparent electrode 352.

The touch panel 300 includes an X-electrode bar 318 connected to both sides of the upper transparent electrode 312 for applying a voltage in the horizontal direction to the upper transparent electrode 312, And a Y-electrode bar 358 connected to both sides of the lower transparent electrode 352 for applying a voltage in the direction of the lower transparent electrode 352. [ The X-electrode bar 318 includes a first X-electrode bar 316 to which a driving voltage is applied and a second X-electrode bar 317 to which a ground voltage GND is applied. The Y-electrode bar 358 includes a first Y-electrode bar 356 to which a driving voltage is applied and a second Y-electrode bar 357 to which a ground voltage GND is applied. The X-electrode bar 318 and the Y-electrode bar 358 may be formed of a material having good conductivity, such as Ag, Au, Cu, or alloys thereof. When a driving voltage is applied to the X-electrode bar 318 and the Y-electrode bar 358, potential sweeping is performed between the upper transparent electrode 312 and the lower transparent electrode 352. Since the resistance value of the resistance film formed by the upper transparent electrode 312 and the lower transparent electrode 352 has a spatially uniform value, the dislocation damping becomes a straight line, and the relationship between the distance and the voltage is expressed by a linear equation. That is, it is possible to detect the touch point where energization occurs between the upper transparent electrode 312 and the lower transparent electrode 352 through the difference between the input voltage and the detection voltage.

The touch information for the touch point is supplied to the external touch controller 390 through the signal line 380. [ As the signal wiring 380, a flexible printed circuit (FPC) may be used. The touch controller 390 receives the touch information supplied through the signal line 380, that is, the detected voltage information, and then converts the position coordinates of the touch point according to the potential difference change.

The adhesive layer 200 adheres the touch panel 300 to the upper surface of the display panel 100 through a laminating process or the like to integrate the protrusions 100 and 300 together. In the present invention, a resistive touch panel is described as an example of a touch panel. However, the present invention is not limited thereto, and the present invention is applicable to a transparent electrode of a touch panel of various types such as an electrostatic capacity type or a static pressure type.

Hereinafter, the black matrix composition of the present invention will be described in detail in the following experimental examples. However, the following experimental examples are merely illustrative of the present invention, and the present invention is not limited to the following experimental examples.

Experiment 1: Measurement of Optical Density of Black Matrix According to Carbon Black Content and Organic Pigment Content

Experimental Example 1

An epoxy acrylate as a binder, ethylene glycol diacrylate as a crosslinking agent, 1,2-octadione-1- (4-phenylthio) phenyl-2- (o-benzoyloxime) as a photoinitiator, an epoxy silane as an adhesion promoter, 20 parts by weight of a total solid component was prepared by using carbon black as a pigment, carmine 6B as an pigment and phthalocyanine blue as an organic pigment, and then solid components were mixed with 80 parts by weight of cyclohexanone as a solvent to prepare a black matrix A composition was prepared.

The content of carbon black in the black matrix composition was 10, 20, and 30 parts by weight based on 100 parts by weight of the total solid component, and a black matrix was formed on the substrate while adjusting the organic pigment from 20 parts by weight to 60 parts by weight Respectively.

The optical density of the black matrix prepared according to the Experimental Example was measured and shown in FIG. 4A. Referring to FIG. 4A, it was found that the content of carbon black was increased from 10 parts by weight to 30 parts by weight, and the optical density was increased as the content of organic pigments was increased from 20 parts by weight to 60 parts by weight. Therefore, it was confirmed through experiment 1 that the optical density of the black matrix was improved when the organic pigment was included in the carbon black as the pigment. Also, the surface resistance of the black matrix was found to be 10 13 Ω / sq or more.

Particularly, when a touch panel display requires a black matrix having an optical density of 2 / 탆 or more, the present invention relates to a method of manufacturing a black matrix exhibiting optical density of 2 to 2.5 / 탆 by adding at least 20 parts by weight of carbon black do.

Experiment 2: Determination of dielectric constant of black matrix according to content ratio of organic pigment

Experimental Example 2

Under the same conditions as Experimental Example 1, the content of carbon black was fixed to 30 parts by weight, and the content of organic pigment was adjusted from 0 to 30 parts by weight to form a black matrix.

The dielectric constant of the black matrix prepared according to the above Experimental Example was measured and shown in FIG. 4B. Referring to FIG. 4B, in Experimental Example 2, it was found that the dielectric constant was increased as the content of the organic pigment was increased from 0 to 30 parts by weight. Therefore, it was confirmed through experiment 2 that the dielectric constant of the black matrix was improved when the organic pigment was included in the carbon black as the pigment. However, when a touch panel display device requires a black matrix having a dielectric constant of 8 or less, it can be understood that the content of the organic pigment should be 20 parts by weight or less.

Through the experiments 1 and 2, the optical density of the black matrix can be improved by including the organic pigment in the black matrix composition, and the dielectric constant can be lowered to 10 or less by adjusting the content ratio of the carbon black and the organic pigment There is an advantage.

The black matrix produced as described above has excellent optical density, and is formed on the thin film transistor of the display device, so that the light irradiated to the thin film transistor can be effectively blocked. By having a dielectric constant of 10 or less, there is an advantage that it is possible to prevent the electrical characteristics of the thin film transistor from deteriorating even if it is formed on the thin film transistor.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (12)

A black matrix composition for use in a touch panel display device comprising a binder, a photoinitiator, a surfactant, a pigment, and a solvent,
Wherein the pigment comprises carbon black and an organic pigment,
Wherein the carbon black is contained in an amount of 20 to 30 parts by weight based on the total solid component, and the organic pigment is contained in an amount of 10 to 20 parts by weight based on the total solid component.
The method according to claim 1,
Wherein the content ratio of the carbon black to the organic pigment is 1: 2 to 1: 6.
The method according to claim 1,
Wherein the organic pigment is at least one organic pigment selected from red, green or blue.
The method according to claim 1,
Wherein the black matrix composition further comprises a crosslinking agent and an additive.
A thin film transistor array substrate on which a pixel electrode and a black matrix are formed, a display panel having a liquid crystal layer interposed between the color filter substrate and the display panel; And
And a touch panel disposed on the display panel and including nano-mesh transparent electrodes spaced apart from each other,
Wherein the black matrix is formed of a black matrix composition comprising a binder, a photoinitiator, a surfactant, a pigment and a solvent, the pigment comprising carbon black and an organic pigment, wherein the carbon black is present in an amount of 20 to 30 parts by weight And the organic pigment is contained in an amount of 10 to 20 parts by weight based on the total solid component.
6. The method of claim 5,
Wherein the black matrix is formed on the thin film transistor of the thin film transistor array substrate.
6. The method of claim 5,
Wherein the content ratio of the carbon black to the organic pigment is 1: 2 to 1: 6.
6. The method of claim 5,
Wherein the organic pigment is at least one organic pigment selected from red, green, and blue.
6. The method of claim 5,
Wherein the transparent electrodes comprise a conductive material and the conductive material is at least one selected from PEDOT: PSS, CNT, Ag nanoparticles, and Cu nanoparticles.
6. The method of claim 5,
Wherein the black matrix exhibits a sheet resistance of 10 < 13 > OMEGA / sq or more.
6. The method of claim 5,
Wherein the black matrix exhibits an optical density of 2 to 2.5 / 占 퐉.
6. The method of claim 5,
Wherein the pixel electrode and the black matrix are located on the same layer.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140148231A (en) * 2013-06-21 2014-12-31 엘지디스플레이 주식회사 Thin film transistor and Display Device and Method of manufacturing the sames
KR20140148232A (en) * 2013-06-21 2014-12-31 엘지디스플레이 주식회사 Thin film transistor and Organic light emitting Display Device and Method of manufacturing the sames
KR20150053111A (en) 2013-11-07 2015-05-15 (주)유티아이 Protective coating material on side edge for capacitive touch screen panel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140148231A (en) * 2013-06-21 2014-12-31 엘지디스플레이 주식회사 Thin film transistor and Display Device and Method of manufacturing the sames
KR20140148232A (en) * 2013-06-21 2014-12-31 엘지디스플레이 주식회사 Thin film transistor and Organic light emitting Display Device and Method of manufacturing the sames
KR20150053111A (en) 2013-11-07 2015-05-15 (주)유티아이 Protective coating material on side edge for capacitive touch screen panel

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