KR102487877B1 - Liquid crystal display device and method for manufacturing thereof - Google Patents

Abstract

A liquid crystal display according to an embodiment of the present invention is disposed on a first substrate, a second substrate facing the first substrate, a first polarizing plate under the first substrate, a second polarizing plate on the second substrate, and a second substrate. and a conductive tape positioned apart from the second polarizing plate and a protective layer positioned between the second polarizing plate and the conductive tape and covering a side surface of the second polarizing plate.

Description

Liquid crystal display device and its manufacturing method {LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR MANUFACTURING THEREOF}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of minimizing the occurrence of defects due to permeation of chemicals or moisture into an edge side of a liquid crystal panel and a manufacturing method thereof.

BACKGROUND ART With the advent of a full-fledged information age, a display field that visually displays electrical information signals is rapidly developing. Accordingly, research is being conducted to improve the performance of various display devices, such as thinning, lightening, and low power consumption.

Representative examples of such a display device include a liquid crystal display device (LCD), a field emission display device (FED), and an organic light emitting display device (OLED). there is. In common, these display devices essentially include a display panel for realizing an image. The display panel has a structure in which a pair of substrates having a light emitting material or a polarizing material interposed therebetween face to face and bonded together.

A liquid crystal display (LCD) displays an image by adjusting the transmittance of light emitted from a backlight unit using the light transmittance of liquid crystal. To this end, the liquid crystal display device includes a first substrate that is a first substrate, a second substrate bonded to the top of the first substrate with a liquid crystal layer interposed therebetween, a first polarizing plate attached to the first substrate, and a second substrate attached to the second substrate. It comprises a liquid crystal panel provided with 2 polarizing plates.

A gate line and a data line are crossed on the first substrate to define a pixel area, a thin film transistor is formed in an area where the gate line and the data line intersect, and a pixel electrode connected to the thin film transistor is formed in the pixel area. there is. The pad portion provided on the peripheral area of one side of the first substrate is exposed to the outside to be connected to a panel driver that applies signals to the gate line and the data line.

The second substrate is formed to have a relatively smaller area than the first substrate and is bonded to the remaining first substrate except for the pad portion of the first substrate with liquid crystal interposed therebetween.

The first polarizer is attached to the lower surface of the first substrate to polarize light incident from the backlight unit. In addition, the second polarizing plate is attached to the upper surface of the second substrate to polarize light emitted to the outside through the second substrate. The first polarizer and the second polarizer generally have light transmission axes perpendicular to each other.

The panel driver is connected to the exposed pad portion of the first substrate and supplies signals to the gate line and the data line.

In addition, the liquid crystal display includes a backlight unit including a light source, a guide panel including a panel support for supporting the liquid crystal panel, a lower case accommodating the backlight unit and supporting the guide panel, and a cover for covering the liquid crystal panel and the guide panel. It consists of an upper case.

Recently, in the case of liquid crystal display devices, development is being conducted in a direction in which the edge area of the upper case covering the edge of the liquid crystal panel is reduced to have a slim and narrow bezel, and accordingly, the possibility of the edge of the liquid crystal panel being exposed to the outside increases. there is.

In the liquid crystal display device, an edge side of the liquid crystal panel may be vulnerable to an external environment. When chemicals or moisture permeate through the edge side of the liquid crystal panel, defects may occur in the edge area of the liquid crystal panel. It can be recognized from the outside.

In particular, a conductive tape may be formed on a second substrate on one side of a liquid crystal panel in order to prevent damage caused by static electricity from the outside in a horizontal electric field type liquid crystal display. In this case, the conductive tape is on the same second substrate A space between the second polarizing plates may be more vulnerable to chemical substances or moisture from the outside.

Recently, in a reliability test of a high-temperature, high-humidity atmosphere of a transverse electric field type liquid crystal display, some layers of a plurality of layers constituting a polarizer by a chemical reaction between a chemical substance or moisture penetrated through the edge side of the second polarizer of the liquid crystal panel and the polarizer A phenomenon in which shrinkage occurs and color distortion occurs in the liquid crystal display device is causing a problem in display quality.

In addition, a defect in which a part of the second polarizing plate is peeled off or damaged by chemicals or moisture penetrating from the edge of the liquid crystal panel through the edge side of the second polarizing plate occurs, resulting in a decrease in the reliability of the liquid crystal display according to the external environment. improvement is required.

The present invention has been made to solve the above problems, and in a liquid crystal display device, a protective layer is formed between the second polarizing plate and the conductive tape at the lower edge of the liquid crystal panel to cause defects due to permeation of chemicals or moisture into the edge side of the liquid crystal panel. It is a technical task to provide a liquid crystal display device with minimized occurrence and improved reliability in external environments and a method for manufacturing the same.

Solved problems according to embodiments of the present invention are not limited to the above-mentioned problems, and other problems not mentioned above will be clearly understood by those skilled in the art from the description below.

According to an embodiment of the present invention, a liquid crystal display capable of minimizing the occurrence of defects due to permeation of chemicals or moisture into an edge side of a liquid crystal panel and a manufacturing method thereof are provided.

A liquid crystal display according to an embodiment of the present invention is disposed on a first substrate, a second substrate facing the first substrate, a first polarizing plate under the first substrate, a second polarizing plate on the second substrate, and a second substrate. and a conductive tape positioned apart from the second polarizing plate and a protective layer positioned between the second polarizing plate and the conductive tape and covering a side surface of the second polarizing plate.

The conductive tape may electrically connect the first substrate and the second substrate.

A transparent conductive electrode disposed on the second substrate and positioned under the second polarizing plate may be further included.

The protective layer may be positioned on the second substrate of at least one side of the four sides of the liquid crystal display.

The protective layer includes ethyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, and methyl nonafluorobutyl ether. ether) and at least one of a fluoroaliphatic polymer.

The thickness of the protective layer may be 15 μm to 20 μm.

The protective layer may be formed by any one of a spray method, a jetting method, a pad print method, and a pen method.

The separation distance between the conductive tape and the second polarizing plate may be 0.25 mm or more.

The second substrate and the conductive tape may overlap by 0.75 mm or more.

The protective layer may be configured to minimize permeation of chemicals or moisture into the second polarizer.

The liquid crystal display device may further include a first layer disposed on at least one of four side sides and covering side surfaces of the first substrate, the second substrate, and the second polarizing plate.

The first layer may be configured to minimize occurrence of light leakage defects at the edges of the first substrate and the second substrate.

A second layer disposed on the first layer may be further included.

The second layer may be configured to minimize permeation of chemicals or moisture into the second polarizer.

In addition, in the method of manufacturing a liquid crystal display device according to an embodiment of the present invention including a liquid crystal panel composed of a first substrate and a second substrate facing each other and a liquid crystal layer therebetween, among the four sides of the liquid crystal panel, the liquid crystal panel Forming a first layer on the left edge, top edge and right edge sides and forming a second layer on the left edge, top edge and right edge sides of the liquid crystal panel and forming a second layer on the four side edges of the liquid crystal panel Among them, a step of forming a protective layer between the conductive tape and the second polarizing plate at the lower edge of the liquid crystal panel is included.

Forming the first layer may include applying ink to cover the first substrate, the second substrate, and the second polarizing plate on the second substrate, and curing the ink.

Forming the second layer may include applying an ultraviolet (UV) curable resin on the first layer and curing the ultraviolet curable resin.

Forming the protective layer may include applying a protective layer between the second polarizing plate and the conductive tape to cover a side surface of the second polarizing plate and curing the protective layer.

According to the liquid crystal display device according to an embodiment of the present invention, a protective layer is formed between the polarizing plate and the conductive tape located at the edge of the lower end of the liquid crystal panel to minimize the permeation of chemicals or moisture through the polarizing plate and the conductive tape. It is possible to minimize deformation or peeling defects of the polarizing plate due to reaction with moisture and improve the reliability of the liquid crystal display device against the external environment.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

Since the content of the invention described in the problem to be solved, the means for solving the problem, and the effect above does not specify the essential features of the claim, the scope of the claim is not limited by the matters described in the content of the invention.

1A is a diagram showing a schematic planar structure of a liquid crystal display according to an exemplary embodiment of the present invention.
FIG. 1B is a view showing a cross-sectional structure of a liquid crystal display according to an embodiment of the present invention at XX'.
1C is a diagram illustrating a cross-sectional structure of a liquid crystal display at Y-Y' according to an exemplary embodiment of the present invention.
2 is a view showing a cross-sectional structure of a liquid crystal display device according to another exemplary embodiment of the present invention.
3A to 3D are views illustrating a method of forming a protective layer of a liquid crystal display according to an embodiment of the present invention.
4 is a flowchart illustrating a manufacturing method of a liquid crystal display device according to an exemplary embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be embodied in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, so the present invention is not limited to the details shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range. In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

In addition, although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship. may be

Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1A is a diagram showing a schematic planar structure of a liquid crystal display according to an exemplary embodiment of the present invention.

1B is a view showing a cross-sectional structure of a liquid crystal display according to an embodiment of the present invention at XX'.

FIG. 1C is a diagram showing a cross-sectional structure of a liquid crystal display in YY' according to an embodiment of the present invention.

Referring to FIG. 1A , a liquid crystal display 100 according to an embodiment of the present invention includes a left edge 100a, an upper edge 100b, a right edge 100c, and a lower edge 100d when viewed from the front. It has 4 sides.

In addition, when viewed from the side rather than the front of the liquid crystal display device 100, the four side sides are the first polarizing plate ( 113) and a second polarizing plate 114 positioned on the second substrate 112.

Also, referring to FIGS. 1A, 1B, and 1C, the liquid crystal display device 100 according to an embodiment of the present invention includes a liquid crystal panel 110, a backlight unit 120, a guide panel 130, and a lower case 140. It is composed of.

The liquid crystal panel 110 may include a first substrate 111 and a second substrate 112 bonded to face each other with the liquid crystal layer LC interposed therebetween. In addition, a first polarizing plate 113 positioned under the first substrate 111 and a second polarizing plate 114 positioned on the second substrate 112 are included.

The first substrate 111 may be a thin film transistor array substrate including a plurality of pixels including thin film transistors. For example, the first substrate 111 includes a plurality of gate lines and a plurality of data lines defining pixel areas formed to cross each other, and a horizontal electric field according to signals formed for each pixel area and supplied to the corresponding gate lines and data lines. It may include a plurality of pixels formed to drive the liquid crystal material of the liquid crystal layer LC on the corresponding pixel area.

Each of the plurality of pixels overlaps or is formed in parallel with a thin film transistor connected to a corresponding gate line and a data line, a plurality of pixel electrodes connected to the thin film transistor to which data signals are supplied through the thin film transistor, and a plurality of pixel electrodes to generate a common voltage. It may include at least one common electrode supplied.

As described above, the first substrate 111 forms a horizontal electric field on the corresponding pixel area by the data signal supplied to the pixel electrode of each pixel and the common voltage supplied to the common electrode to form the liquid crystal layer LC on the corresponding pixel area. By driving, the light transmittance of the corresponding pixel area irradiated from the backlight unit 120 is adjusted.

The second substrate 112 may be a color filter array substrate including a color filter formed to overlap each of a plurality of pixels. For example, the second substrate 112 may include a pixel defining pattern defining a light penetrating area corresponding to each of a plurality of pixels, a color filter layer formed in the light penetrating area, and an overcoat layer covering the pixel defining pattern and the color filter layer. can

As such, the second substrate 112 filters the light emitted forward through the liquid crystal layer LC into color light so that a color image is displayed on the liquid crystal panel 110 .

The first substrate 111 and the second substrate 113 are bonded to each other by means of a sealant with the liquid crystal layer LC interposed therebetween.

The specific configuration of the first substrate 111 and the second substrate 112 is a driving mode of the liquid crystal layer, for example, TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode, and It may be formed in various forms according to a Fringe Field Switching (FFS) mode or the like.

1A, 1B, and 1C, the liquid crystal display 100 according to an embodiment of the present invention includes a first polarizing plate 113 and a second substrate 112 positioned under a first substrate 111. It is configured to include a second polarizing plate 114 located on the top.

The first polarizing plate 113 located under the first substrate 111 and the second polarizing plate 114 located on the second substrate 112 each include a first protective film, a polarizing film (Poly Vinyl Alcohol: PVA), It has a structure in which a plurality of layers such as the second protective film and the antireflection film are sequentially stacked.

The first protective film and the second protective film are formed on the upper and lower surfaces of the polarizing film to protect the polarizing film. At this time, the first protective film is attached to the substrate by an adhesive.

The antireflection film is formed on the upper surface of the second protective film to prevent reflection of external light generated from the surfaces of the lower and upper polarization members, respectively.

A polarizing film changes unpolarized light vibrating in multiple directions into polarized light vibrating in only one direction. The polarizing film may be manufactured through elongation in a specific direction after iodine is dyed on a polyvinyl alcohol (PVA) film.

Accordingly, the polarizing film PVA polarizes incident light by absorbing light vibrating in the same direction as the stretching direction and transmitting light vibrating in a direction perpendicular to the stretching direction.

Also, referring to FIGS. 1A , 1B and 1C , the backlight unit 120 is disposed under the liquid crystal panel 110 to supply light to the liquid crystal panel 110 .

The backlight unit 120 is a direct type method in which a light source is disposed on the lower front surface of the liquid crystal panel 110 and the light emitted from the light source is directly transmitted toward the liquid crystal panel 110, and one lower side of the liquid crystal panel 110 A light source may be disposed in the edge type method to transfer the light emitted from the light source to the liquid crystal panel 110 through the light guide plate. In the case of the present invention, either a direct type method or an edge type method can be applied.

For example, in the case of the edge-type backlight unit 120, a light source located on one side of the lower portion of the liquid crystal panel 110, a light guide plate that transmits light emitted from the light source upward, and a diffuse light transmitted from the light guide plate It may include a plurality of optical sheets for improving the luminance characteristics of light traveling from the light guide plate toward the liquid crystal panel 110. Here, the light source may include a light emitting diode (LED) or a fluorescent lamp.

The optical sheet may be formed of a combination of a diffusion sheet and a prism sheet, but is not necessarily limited thereto. For example, the optical sheet may further include a dual brightness enhancement film (DBEF).

1a, 1b and 1c, the guide panel 130 supports the liquid crystal panel 110 and covers the side surface of the liquid crystal panel 110 and the side surface of the backlight unit 120. .

The guide panel 130 protrudes from guide sidewalls surrounding respective side surfaces of the liquid crystal panel 110 and the backlight unit 120 and an inner surface of the guide sidewall to support the lower edge portion of the liquid crystal panel 110. It may be configured to include a panel support to.

Also, referring to FIGS. 1A, 1B, and 1C, the lower case 140 is formed in an open top surface to have a storage space, and accommodates the backlight unit 120 and supports the guide panel 130. . To this end, the lower case 140 may include a cover plate and a cover sidewall.

The cover plate supports the light guide plate of the back light unit 120 and a plurality of optical sheets. In addition, the sidewall of the cover is bent vertically from the edge of the cover plate to support the guide panel 130 while defining an accommodation space in which the backlight unit 120 is accommodated on the cover plate.

The lower case 140 may be made of a metal material and may be electrically connected to a ground member in some cases.

In the case of a liquid crystal display of a transverse electric field mode such as the above-described IPS (In Plane Switching) mode or FFS (Fringe Field Switching) mode, at least one pair of electrodes arranged in parallel are formed in a pixel so as to be substantially parallel to the substrate. By forming a transversal electric field, the liquid crystal molecules are aligned in a plane.

That is, a pixel electrode and a common electrode are formed on the first substrate, which is a lower substrate, and the liquid crystal molecules of the liquid crystal layer are driven by a horizontal electric field formed between the pixel electrode and the common electrode.

Since electrodes are not formed on the second substrate, which is an upper substrate, the liquid crystal display of the transverse electric field mode driven by such a horizontal electric field is prone to inflow of unnecessary charges such as static electricity from the outside. At this time, when static electricity is introduced from the outside, a deterioration in image quality may occur because the static electricity affects the molecular arrangement direction of the liquid crystal and interferes with normal operation.

Therefore, in order to solve the above problem, in the case of a transverse electric field mode liquid crystal display, a transparent conductive electrode may be included on the upper surface of the second substrate. Such a transparent conductive electrode may serve as a ground for discharging noise signals such as static electricity flowing into the liquid crystal panel while transmitting light passing through the second substrate to the outside.

That is, static electricity introduced from the outside can be discharged to the outside by forming a transparent conductive electrode on the second substrate and then grounding the transparent conductive electrode through a conductive tape.

However, when the conductive tape is formed on the second substrate on one side of the liquid crystal panel as described above, the space between the conductive tape and the second polarizer may be vulnerable to chemical substances or moisture from the outside.

Looking at the lower edge 100d of the liquid crystal display device 100 according to the embodiment of the present invention with reference to FIG. 1B, that is, the cut plane at XX' in FIG. 100), the transparent conductive electrode 117 disposed on the second substrate 112, the second polarizing plate 114 disposed on the transparent conductive electrode 117, and the second polarizing plate 114 disposed on the second substrate 112. ) and a conductive tape 115 spaced apart from each other by a predetermined distance (a).

Referring to FIG. 1B , the conductive tape 115 may electrically connect the first substrate 111 and the second substrate 112 . In addition, the conductive tape 115 is applied to the transparent conductive electrode 117 formed on the second substrate 112 exposed to the outside of the second polarizing plate 114 in a part of the non-display area of the second substrate 112. One end is attached, and the other end of the conductive tape 115 is a ground provided on an external driving circuit board, which is one of the components constituting the guide panel 130, the lower case 140, or the liquid crystal display device 100. By attaching to one of the terminals and being grounded, static electricity flowing from the outside can be grounded and discharged to the outside.

The transparent conductive electrode 117 may be made of a material that is transparent and has high electrical conductivity. More specifically, the transparent conductive electrode 117 may be made of a material such as indium tin oxide (ITO), but is not limited thereto.

The second substrate 112 and the conductive tape 115 may be sufficiently overlapped to form stable electrical contact between the transparent conductive electrode 117 on the second substrate 112 and the first substrate 111, , the distance b between the second substrate 112 and the conductive tape 115 may overlap by 0.75 mm or more.

Referring also to FIG. 1B , the liquid crystal display 100 according to an exemplary embodiment of the present invention includes a protective layer disposed between the second polarizing plate 114 and the conductive tape 115 to cover the side surface of the second polarizing plate 114 . (116) may be included.

Referring to FIGS. 1A and 1B , the conductive tape 115 may be disposed on a lower edge 100d of the four side sides of the liquid crystal display device 100, and the protective layer 116 may be disposed on the liquid crystal display device ( 100) may be disposed between the second polarizing plate 114 and the conductive tape 115 at the lower edge 100d.

However, the positions of the conductive tape 115 and the protective layer 116 are not necessarily limited thereto, and the conductive tape 115 and the protective layer 116 are located on the four sides of the liquid crystal display device 100, that is, the left side. At least one of the edge 100a, the upper edge 100b, the right edge 100c, and the lower edge 100d may be located on the second substrate 112 on the side. More specifically, the protective layer 116 may be positioned on the transparent conductive electrode 117 disposed on the second substrate 112 .

In addition, the protective layer 116 includes ethyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, methyl nonafluoro It may include at least one of methyl nonafluorobutyl ether and fluoroaliphatic polymer.

However, the material of the protective layer 116 is not necessarily limited to the above material, and various materials can be applied that are opaque, have excellent moisture barrier properties, and also have low viscosity properties and chemical stability.

In addition, the thickness of the protective layer 116 should be formed to a thickness sufficient to completely cover the side surface of the second polarizing plate 114, so the thickness of the protective layer 116 is 15 μm to 20 μm. can be formed

Referring to FIG. 1B , the separation distance (a) between the second polarizing plate 114 and the conductive tape 115 is determined by the protective layer 116 applied between the second polarizing plate 114 and the conductive tape 115. It should be configured to have a distance sufficient to cover the side surface of the polarizer 114, and more specifically, the separation distance (a) may be 0.25 mm or more.

The protective layer 116 is a spray method that scatters and ejects ink supplied by pneumatic pressure over a large area, a jetting method that ejects ink through a piezo drive by an applied pulse, and silicon. It may be formed by any one of a pad print method in which the ink filled in the pad is transferred to a substrate to form a pattern, and a method in which ink is applied through a pen containing ink.

That is, the protective layer 116 of the liquid crystal display 100 according to the exemplary embodiment of the present invention is formed between the second polarizing plate 114 and the conductive tape 115 to cover the side surface of the second polarizing plate 114 and 2 may be configured to minimize penetration of chemicals or moisture into the side of the polarizer 114 .

Also, referring to FIG. 1C , looking at a cut plane of the liquid crystal display device 100 according to an embodiment of the present invention, that is, at Y-Y', the liquid crystal display device 100 according to the embodiment of the present invention is a liquid crystal display device 100 ) is located on the left edge 100a, the top edge 100b, and the right edge 100c, and covers the side surfaces of the first substrate 111, the second substrate 112, and the second polarizer 114. (118) may be further included.

That is, the first layer 118 is at least one of the four sides of the liquid crystal display device 100, that is, the left edge 100a, the top edge 100b, the right edge 100c, and the bottom edge 100d. It may be located on the sides of the first substrate 111, the second substrate 112 and the second polarizing plate 114 of the.

The first layer 118 is formed on the first substrate 111 by light supplied from the backlight unit 120 configured under the first polarizing plate 113 disposed on the lower surface of the first substrate 111 of the liquid crystal display device 100. ) and the occurrence of light leakage defects that may occur at the edge of the second substrate 112 may be minimized.

For example, the first layer 118 may be made of a heat-curable resin including a pigment such as black ink. The first layer 118 is made of any one of a printed layer, a film, and a coated film of a color printing pigment having very low transmittance, and prevents light leakage in the non-display area of the first substrate 111 and the second substrate 112. It can perform a preventive function.

In addition, the first layer 118 may be applied by spraying, jetting, or pad printing to cover the side surfaces of the first substrate 111, the second substrate 112, and the second polarizing plate 114. It may be formed by any one of a print method and a pen method.

In addition, the first layer 118 may be formed of the same material as the protective layer 116 to minimize penetration of chemicals or moisture into the side of the second polarizer 114 .

That is, in the liquid crystal display device 100 according to an embodiment of the present invention, the protective layer 116 is formed between the second polarizing plate 114 and the conductive tape 115 located at the edge of the lower end of the liquid crystal panel 110 so that the second By minimizing the permeation of chemicals or moisture between the polarizer 114 and the conductive tape 115, it is possible to minimize the occurrence of defects in which the second polarizer 114 is deformed or peeled off due to a reaction with the chemicals or moisture. Reliability of the liquid crystal display device against the external environment can be improved.

2 is a view showing a cross-sectional structure of a liquid crystal display device according to another exemplary embodiment of the present invention.

In the case of the liquid crystal display device 200 according to another embodiment of the present invention, the embodiment of the present invention described with reference to FIGS. 1A to 1C except that the second layer is further included on the first layer 118. Since it has the same configuration as the liquid crystal display device 100 according to, repeated detailed description of substantially the same configuration will be omitted.

Referring to FIG. 2 , a liquid crystal display 200 according to another embodiment of the present invention has a left edge 100a and an upper edge the same as the liquid crystal display 100 according to the embodiment shown in FIG. 1c. (100b) and a first layer (118) covering the side surfaces of the first substrate (111), the second substrate (112) and the second polarizing plate (114) at the right edge (100c).

That is, the first layer 118 is at least one of the four sides of the liquid crystal display 200, that is, the left edge 100a, the top edge 100b, the right edge 100c, and the bottom edge 100d. formed on the side surfaces of the first substrate 111, the second substrate 112, and the second polarizing plate 114. Therefore, occurrence of defective light leakage that may occur at the edge of the liquid crystal panel 110 due to light supplied from the backlight unit 120 configured under the first polarizing plate 113 disposed on the lower surface of the first substrate 111 is minimized. can do.

Referring also to FIG. 2 , a liquid crystal display device 200 according to another embodiment of the present invention includes first liquid crystal display devices formed on the left edge 100a, the upper edge 100b, and the right edge 100c of the liquid crystal display 200. A second layer 219 formed on the layer 118 may be further included.

The second layer 219 may be made of an ultraviolet curable resin that can be cured by ultraviolet (UV) irradiation, and penetration of chemicals or moisture into the second polarizer 114 through the edge side of the liquid crystal display device 100 It can be configured to have a sufficient thickness to minimize. Also, it is possible to additionally configure at least one or more layers on the second layer 219 .

That is, in the case of the liquid crystal display device 200 according to another embodiment of the present invention, the first substrate 111, the second substrate 112 and the second polarizing plate ( 114) by providing a first layer 118 located on the side and a second layer 219 located on the first layer 118, the first substrate 111 and the second substrate 112 It is possible to minimize the occurrence of defective light leakage at the edge and at the same time minimize the permeation of chemicals or moisture into the second polarizer 114 through the edge side of the liquid crystal display.

3A to 3D are views illustrating a method of forming a protective layer of a liquid crystal display according to an embodiment of the present invention.

Referring to FIG. 3A , the liquid crystal panel 110 of the liquid crystal display device according to an embodiment of the present invention includes a first substrate 111 and a second substrate 112 bonded to each other with the liquid crystal layer LC interposed therebetween. can be made including In addition, the first polarizing plate 113 positioned under the first substrate 111 and the second polarizing plate 114 positioned on the second substrate 112 are included.

In addition, the transparent conductive electrode 117 disposed on the second substrate 112, the second polarizing plate 114 disposed on the transparent conductive electrode 117, and disposed on the second substrate 112, the second polarizing plate 114 and A conductive tape 115 spaced apart from each other by a predetermined distance may be included.

The second polarizing plate 114 and the conductive tape 115 may be configured to have a sufficient distance so that the protective layer 116 applied therebetween can cover the side surface of the second polarizing plate 114 .

In addition, a protective film 310 is disposed on the upper surface of the second polarizing plate 114 . The protective film 310 may be formed of a support and a lower bonding layer, and may be attached to the second polarizing plate 114 of the liquid crystal panel 310 .

Next, referring to FIG. 3B , a protective layer material 316 is applied to a space secured between the second polarizing plate 114 and the conductive tape 115 using a dispenser 350 equipment. By applying the protective layer material 316 on the end of the protective film 310 on the second polarizing plate 114, the protective layer material 316 flows down the side surface of the second polarizing plate 114 to form a second polarizing plate ( 114) and the conductive tape 115 can be easily filled.

Here, the protective layer material 316 applied between the second polarizing plate 114 and the conductive tape 115 should be applied to a sufficient thickness to cover the side surface of the second polarizing plate 114 .

Next, referring to FIG. 3C , a protective layer material 316 is applied between the second polarizing plate 114 and the conductive tape 115 to a thickness sufficient to cover the side surface of the second polarizing plate 114 and then cured at room temperature to protect the protection. Layer 116 is formed.

Finally, referring to FIG. 3D , the liquid crystal panel 110 of the liquid crystal display device according to the embodiment of the present invention is completed by removing the protective film 310 disposed on the upper surface of the second polarizing plate 114 .

The protective layer 116 formed in the above manner minimizes permeation of chemicals or moisture through the space between the second polarizing plate 114 and the conductive tape 115 so that the second polarizing plate 114 is deformed by a chemical reaction. Alternatively, a peeling defect may be minimized and reliability of the liquid crystal display device against an external environment may be improved.

4 is a flowchart illustrating a manufacturing method of a liquid crystal display device according to an exemplary embodiment of the present invention.

Referring first to FIG. 4 , a method of manufacturing a liquid crystal display device according to an embodiment of the present invention including a liquid crystal panel including a first substrate and a second substrate facing each other and a liquid crystal layer therebetween is first of all four parts of the liquid crystal panel. Among the side edges, a step of forming a first layer on the left edge, top edge, and right edge of the liquid crystal panel (S401) may be included.

In the step of forming the first layer, ink is applied to the side surfaces of the first substrate, the second substrate, and the second polarizing plate on the second substrate so as to cover the first substrate, the second substrate, and the second polarizing plate on the second substrate. and heat-curing the ink (S402).

Next, referring to FIG. 4 , a second layer may be formed on the first layer formed on the left edge, the top edge, and the right edge side of the liquid crystal panel among the four sides (S403).

In addition, the forming of the second layer may include applying a UV curable resin on the first layer and curing the UV curable resin by irradiating UV to the resin (S404).

Next, referring to FIG. 4 , a protective layer may be formed between the second polarizing plate and the conductive tape at the lower edge of the liquid crystal panel among the four sides of the liquid crystal panel ( S405 ).

Forming the protective layer may include applying the protective layer between the second polarizing plate and the conductive tape to cover the side surface of the second polarizing plate, and naturally curing the protective layer at room temperature (step 406 ).

Here, the step of forming the first layer including the step of applying the first layer (S401) and the step of curing the first layer (S402), the step of applying the second layer (S403) and curing the second layer. The order of the steps of forming the second layer including the step (S404) may be reversed, and even in this case, the occurrence of defective light leakage that may appear at the edge of the liquid crystal panel is minimized through the first layer and the second layer. At the same time, the same effect of minimizing penetration of chemicals or moisture into the second polarizing plate 114 through the edge side of the liquid crystal panel can be obtained.

As described above, the liquid crystal display device according to the exemplary embodiment of the present invention minimizes permeation of chemicals or moisture through the space between the second polarizing plate and the conductive tape through the formation of a protective layer between the second polarizing plate and the conductive tape. , it is possible to minimize the occurrence of a defect in which the second polarizing plate is deformed or peeled off, and the reliability of the liquid crystal display device against external environments can be improved.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified and implemented without departing from the technical spirit of the present invention. there is. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The protection scope of the present invention should be construed according to the scope of the claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: liquid crystal display
110: liquid crystal panel
111: first substrate
112: second substrate
113: first polarizing plate
114: second polarizing plate
115: conductive tape
116: protective layer
117: transparent conductive electrode
118: first layer
219: second layer
120: backlight unit
130: guide panel
140: lower case

Claims (18)

a first substrate and a second substrate positioned opposite to the first substrate;
a first polarizing plate under the first substrate and a second polarizing plate on the second substrate;
a conductive tape disposed on one of the four side sides of the liquid crystal display device, disposed on the second substrate, and spaced apart from the second polarizing plate;
a protective layer disposed between the second polarizing plate and the conductive tape and covering a side surface of the second polarizing plate; and
A first layer located on at least one of the four side sides of the liquid crystal display device, except for the side side on which the conductive tape is disposed, covering side surfaces of the first substrate, the second substrate, and the second polarizing plate. A liquid crystal display device comprising a. According to claim 1,
The conductive tape electrically connects the first substrate and the second substrate. According to claim 2,
The liquid crystal display device further includes a transparent conductive electrode disposed on the second substrate and positioned below the second polarizing plate. According to claim 1,
The protective layer is located on the second substrate of at least one side among four side sides of the liquid crystal display device. According to claim 1,
The protective layer is composed of ethyl nonafluoroisobutyl ether, ethyl nonafluorobutyl ether, methyl nonafluoroisobutyl ether, and methyl nonafluorobutyl ether. A liquid crystal display device comprising at least one of nonafluorobutyl ether) and a fluoroaliphatic polymer. According to claim 1,
The thickness of the protective layer is 15㎛ to 20㎛ liquid crystal display device. According to claim 1,
The protective layer is a liquid crystal display device made by any one of a spray method, a jetting method, a pad print method, and a pen method. According to claim 1,
The liquid crystal display device wherein the separation distance between the conductive tape and the second polarizing plate is 0.25 mm or more. According to claim 1,
The liquid crystal display device configured to overlap the second substrate and the conductive tape by 0.75 mm or more. According to claim 1,
The protective layer is configured to minimize penetration of chemicals or moisture into the second polarizing plate. delete According to claim 1,
The liquid crystal display device of claim 1 , wherein the first layer is configured to minimize occurrence of light leakage defects at edges of the first substrate and the second substrate. According to claim 12,
The liquid crystal display device further comprising a second layer positioned on the first layer. According to claim 13,
The second layer is a liquid crystal display device configured to minimize permeation of chemicals or moisture into the second polarizing plate. In the manufacturing method of a liquid crystal display device including a liquid crystal panel composed of a first substrate and a second substrate facing each other and a liquid crystal layer therebetween,
forming a first layer on a left edge, an upper edge and a right edge of the liquid crystal panel among the four sides of the liquid crystal panel;
forming a second layer on the first layer at the side of the left edge, top edge and right edge of the liquid crystal panel; and
and forming a protective layer between a conductive tape and a second polarizing plate at a lower edge of the liquid crystal panel, among four sides of the liquid crystal panel. According to claim 15,
Forming the first layer,
and applying ink to cover the first substrate, the second substrate, and a second polarizing plate on the second substrate, and curing the ink. According to claim 15,
Forming the second layer,
and applying an ultraviolet (UV) curable resin on the first layer and curing the ultraviolet curable resin. According to claim 15,
Forming the protective layer,
and applying a protective layer between the second polarizing plate and the conductive tape to cover a side surface of the second polarizing plate, and curing the protective layer.

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