KR20150142337A - Liquid crystal display device having electro-static discharing structure - Google Patents

Abstract

The present invention relates to a liquid crystal display device. The present invention directly and electrically connects a conductive concrescence layer to a structure assembling a liquid crystal panel, and grounds static electricity generated in the liquid crystal panel to the structure, thereby reducing manufacturing costs and simplifying manufacturing processes. The liquid crystal display device includes: the liquid crystal panel; a receiving unit receiving and fixing the liquid crystal panel; a first polarizing plate attached to a lower side of the liquid crystal panel; and a second polarizing plate grounding the static electricity generated in the liquid crystal panel to the receiving unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device having an electrostatic discharge structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having an electrostatic discharge structure with low cost and improved reliability.

2. Description of the Related Art Recently, various portable electronic devices such as a mobile phone, a PDA, and a notebook computer have been developed. Accordingly, there is a growing need for a flat panel display device for a light and small size. In addition, such a flat panel display device can be easily and slimmer at high resolution, and thus is applied to a large-area display device.

As such flat panel display devices, a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), and a vacuum fluorescent display (VFD) have been actively studied. However, mass production technology, ease of driving means, , Liquid crystal display devices (LCDs) are in the limelight nowadays because of realization of a large area screen.

The liquid crystal display device is a transmissive display device in which a desired image is displayed on the screen by controlling the amount of light transmitted through the liquid crystal layer by the refractive index anisotropy of the liquid crystal molecules. By arranging the liquid crystal molecules distributed in the liquid crystal layer in a certain direction, It is possible to realize an image by controlling the amount of light transmitted through the layer.

The liquid crystal display device has various driving modes such as VA (Vertical Alignment) mode, Nematic mode, In Plane switching mode, FFS (Fringe Field Switching) mode and the like depending on a method of arranging liquid crystal molecules .

Of these liquid crystal display devices of various driving modes, an IPS mode and an FFS mode liquid crystal display device which can improve the viewing angle characteristics by adjusting the amount of light transmitted through the liquid crystal molecules rotate along a plane parallel to the surface of the substrate are mainly used.

However, the IPS mode and FFS mode liquid crystal display devices have the following problems.

In the liquid crystal display devices of the IPS mode and the FFS mode, an electric field applied in the liquid crystal layer to arrange the liquid crystal molecules is formed in parallel with the surface of the substrate of the liquid crystal display device. On the other hand, in the liquid crystal display device, static electricity is generated outside the device due to external conditions or the like. In particular, in the case of a liquid crystal display device having a touch panel in recent years, human hands are often brought into contact with the touch panel for inputting a signal. Such hand contact is an important cause for generating static electricity outside the liquid crystal display device .

When static electricity is generated outside the liquid crystal display device, the static electricity affects an electric field formed inside the liquid crystal layer. In the IPS mode and FFS mode liquid crystal display devices, the electric field is formed substantially parallel to the surface of the substrate, whereas the static electric field is formed outside the substrate, so that the electric field by the static electricity is formed in a direction perpendicular to the substrate.

Therefore, when a horizontal electric field parallel to the substrate is formed in the liquid crystal layer, when static electricity is generated on the outside of the liquid crystal display device, that is, on the outer surface of the substrate, the horizontal electric field in the liquid crystal layer is distorted by the vertical electric field due to static electricity, This distortion of the electric field distorts the arrangement of the liquid crystal molecules in the liquid crystal layer so that the liquid crystal molecules in the static electricity generating region are not arranged in parallel with the surface of the substrate but arranged at a certain angle in the vertical direction from the surface. As a result, a light leakage phenomenon occurs in the region where the static electricity is generated, resulting in defects such as spots on the screen.

In order to prevent such defects due to static electricity, electrodes for removing static electricity are formed in a liquid crystal display of the IPS mode and the FFS mode. FIG. 1 shows a conventional display element formed with such a static elimination electrode.

As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal panel 10 and a touch panel 80.

The liquid crystal panel 10 includes a first substrate 20 on which various arrays such as thin film transistors and common electrodes and pixel electrodes are formed, a second substrate 30 on which a color filter layer is formed, And a liquid crystal layer (40) formed between the two substrates (30).

The touch panel 80 includes a glass cover 82 and a touch electrode 84 and is attached to the liquid crystal panel 10.

A back electrode 31 for static elimination is formed on the back surface of the second substrate 30, that is, the surface opposite to the surface contacting the liquid crystal layer 40 (that is, the back surface of the second substrate) A ground 21 is formed in the dummy region of the first substrate 20 exposed to the outside and the back electrode 31 and the ground 21 are electrically connected by silver dots 36.

The back electrode 31 is made of a transparent conductive material such as ITO (Indium Tin Oxide). When static electricity is generated outside the liquid crystal panel 10 due to a touch of the touch panel 80 or an external environment, After the static electricity is collected by the back electrode 31, the static electricity is discharged through the dots 36 to the ground 21 and the static electricity is removed.

A first polarizing plate 60 and a second polarizing plate 70 are attached to both sides of the liquid crystal panel 10 to control the amount of light transmitted through the liquid crystal layer 40.

As described above, in the conventional liquid crystal display device, the back electrode 31 is formed on the back surface of the second substrate 30 and electrically connected to the ground through silver dots. Therefore, The manufacturing method is complicated and the production cost is increased because expensive silver should be used.

Since the silver dots 36 are formed between the inner surface of the first substrate 20 and the outer surface of the second substrate 30, A problem arises that static electricity is not discharged from the back electrode 31 to the ground 21 when a crack occurs due to the step difference.

On the other hand, in the case of an in-cell touch liquid crystal display having a structure in which a touch electrode is formed inside the liquid crystal panel 10, a conductive material having a small resistance such as ITO is formed on the back surface of the second substrate 30 The touch signal is detected by the back electrode 31 when touching the liquid crystal panel 10 and the touch signal is not recognized on the touch electrode.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a liquid crystal display element which can simplify manufacturing cost and manufacturing process by forming a module unit structure of a liquid crystal display element and an electrostatic discharge path in direct contact with a set case The purpose.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel; A receiving portion for receiving and fixing the liquid crystal panel; A first polarizer attached to a lower surface of the liquid crystal panel; And a second polarizer attached to an upper surface of the liquid crystal panel, the second polarizer being connected to the liquid crystal panel by direct electrical connection to ground the static electricity generated by the liquid crystal panel to the receiving portion.

The receiving portion includes a lower cover; A guide panel coupled to the lower cover to assemble the liquid crystal panel; And an outer frame of the electronic device set in which the liquid crystal panel is installed, or a conductive guide bar which is coupled to the guide panel and discharges the static electricity generated in the liquid crystal panel, the conductive guide bar being in contact with the conductive adhesive layer of the second polarizer plate .

The adhesion layer is made of a material having a resistance of 10 ⁶ -10 ¹³ Ω / cm ² , preferably a resistance of 10 ⁹ -10 ¹¹ .

The second polarizer includes a first support; A polarizer formed on a first surface of the first support; And a conductive adhesion layer formed on the polarizer, and the first surface of the first support may further include a first surface treatment layer.

In addition, a second support may be further included between the first support and the polarizer, and a second surface treatment layer may be further included on the second surface of the first support. A conductive layer may be additionally disposed between the second support and the conductive adhesive layer.

In the present invention, a conductive adhesive layer is formed on a polarizing plate disposed on a liquid crystal panel so that the polarizing plate is electrically connected to a liquid crystal display element module or a set outer frame having direct conductivity, or a protective layer having a conductive adhesive layer is attached , The cigarette layer is electrically connected to the liquid crystal display element module or the set outer frame, and the static electricity is grounded to the liquid crystal display element module or the set outer frame and discharged.

Therefore, compared with the conventional method of grounding static electricity using silver dots, since expensive silver is not used, manufacturing cost can be reduced, and a silver dot forming step is not necessary, and the manufacturing process can be simplified.

1 is a sectional view showing the structure of a conventional liquid crystal display device;
2 is a cross-sectional view illustrating the structure of a liquid crystal display device according to an embodiment of the present invention.
3A is a cross-sectional view showing the structure of a first polarizing plate according to the present invention.
3B is a cross-sectional view illustrating the structure of a second polarizing plate according to the present invention.
4 is a cross-sectional view illustrating a structure of a liquid crystal display device according to another embodiment of the present invention.
5A to 5D are cross-sectional views showing another structure of the second polarizing plate according to the present invention, respectively.
6A and 6B are diagrams illustrating a structure of a liquid crystal display device according to another embodiment of the present invention.

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

In the present invention, conventionally used electrostatic eliminating electrodes and silver dots are removed to simplify the process and reduce the manufacturing cost. To this end, in the present invention, a polarizer, not a liquid crystal panel, is provided with an electrostatic removing means to remove static electricity.

Particularly, in the present invention, the polarizer is provided with conductivity, and the static electricity is discharged through the external structure by directly contacting an external structure such as a frame of the liquid crystal display element, thereby eliminating a separate electrostatic discharge path. Therefore, expensive electrical contact means such as silver dots are not required, so that the manufacturing cost can be reduced and the manufacturing process can be simplified.

2 is a view showing a structure of a liquid crystal display element according to the present invention. A liquid crystal display element of this structure is a module unit liquid crystal display element for assembling a liquid crystal panel and a backlight.

2, the liquid crystal display device 101 according to the present invention includes a liquid crystal panel 110 for realizing an image and a backlight 190 for supplying light to the liquid crystal panel 110. As shown in FIG.

The liquid crystal panel 110 includes a first substrate 120 having a plurality of pixels defined by a plurality of gate lines and data lines and having pixel electrodes, common electrodes, and thin film transistors formed in each pixel, a color filter layer, And a liquid crystal layer (not shown) formed between the first substrate 120 and the second substrate 130. As shown in FIG.

In the liquid crystal panel 110 having such a structure, when an external signal is applied through the thin film transistor formed on the first substrate 120, an electric field is formed between the pixel electrode and the common electrode of the first substrate 120, The liquid crystal layer is applied to the liquid crystal layer to adjust the alignment of the liquid crystal molecules so that the amount of light transmitted through the liquid crystal layer is controlled to realize an image. The first substrate 120 and the second substrate 130 are attached with a first polarizer 160 for polarizing light incident from a backlight and a second polarizer 170 for polarizing light transmitted through the liquid crystal layer, Thereby controlling the polarization direction of the light.

In addition, the liquid crystal panel 110 includes an IPS mode (in-plane switching mode) and an FFS mode (liquid crystal panel) in which a pixel electrode and a common electrode are formed on a first substrate 120 and an electric field is arranged substantially parallel to a surface of the substrate. (Twist Nematic mode) liquid crystal panel in which a pixel electrode is formed on a first substrate 120 and a common electrode is formed on a second substrate 130, as well as a liquid crystal panel.

A touch electrode is formed on the first substrate 120 of the liquid crystal panel 110 to sense the liquid crystal display device when the user touches the liquid crystal display device, and a touch signal is input to the liquid crystal panel 110.

The backlight 190 includes a light source 191 disposed on the lower side of the liquid crystal panel 110 to emit light and a light source 191 disposed below the liquid crystal panel 110 to guide light emitted from the light source 191, A diffusion plate 193 disposed between the liquid crystal panel 110 and the light guide plate 193 for diffusing and condensing light supplied from the light guide plate 193 to the liquid crystal panel 110, And a reflective plate 194 disposed below the light guide plate 193 and reflecting the light incident on the lower portion of the light guide plate 193. The optical sheet 196 is made of a sheet,

As the light source 191, a fluorescent lamp or an LED may be used. When an LED is used as the light source 191, an LED substrate 292 on which the LED 191 is mounted is provided so that an external signal is input to the LED 191 through the LED substrate 192, .

When a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) or an external eletrode fluorescent lamp (EEFL) is used as the light source, the fluorescent lamp is disposed inside the lamp housing installed on the side of the light guide plate 193, Light is reflected by the reflective layer formed inside the lamp housing and input through the side surface of the light guide plate.

The light guiding plate 193 is for guiding the light inputted from the light source 191 to the liquid crystal panel 110. The light incident on the bottom surface or one side surface of the light guiding plate 193 is reflected inside the light guiding plate 193, And then outputted to the outside of the light guide plate 193. At this time, the light guide plate 193 is formed of a rectangular parallelepiped, and a pattern or a groove may be formed on the bottom surface thereof to scatter incident light.

The optical sheet 196 is supplied to the liquid crystal panel 110 by improving the efficiency of light output from the light guide plate 193. [ The optical sheet 196 includes a diffusion sheet for diffusing the light output from the light guide plate 193 and a prism sheet for condensing the light diffused by the diffusion sheet to supply uniform light to the liquid crystal panel 110. At this time, the diffusion sheet is provided with one sheet or two sheets, and the prism sheet is composed of two sheets of prisms crossing vertically in the x- and y-axis directions to refract light in the x- and y-axis directions to improve the straightness.

The liquid crystal panel 110 and the backlight 190 are supported by the guide panel 104 and then the lower cover 102 and the guide panel 104 are coupled to each other to assemble the liquid crystal panel 110 and the backlight 190 .

At this time, the guide panel 104 is formed in a rectangular band shape having a predetermined width, and the liquid crystal panel 110 is placed on the upper surface thereof. The liquid crystal panel 110 has elasticity between the upper surface of the guide panel 104 and the liquid crystal panel 110 The pad 108 is provided to absorb an external impact, thereby preventing defects.

The first polarizing plate 160 disposed on the lower surface of the liquid crystal panel 110 is formed to be smaller than the area of the liquid crystal panel 110 and disposed within the lower cover 102 but the second polarizing plate 170 Is larger than the area of the liquid crystal panel 110 and extends to the outside of the liquid crystal panel 110 of the second polarizer 170 when assembling the liquid crystal display device.

A guide bar 106 is formed under the second polarizer 170 extending outside the liquid crystal panel 110. The guide bar 106 is coupled to the guide panel 104 by a coupling means such as a screw 103, And the lower cover 102, respectively.

The upper surface of the guide bar 106 is in contact with the lower surface of the extended second polarizing plate 170. The guide bar 106 is formed of a conductive material such as a metal and the guide panel 104 and the lower cover 102 are also formed of a conductive material so that the guide bar 106 protrudes from the lower cover 102, Respectively.

The second polarizer 170 is a conductive polarizer. Therefore, when static electricity is generated in the liquid crystal display element due to user's touch or the like, the static electricity is collected in the second polarizing plate 170. Since the second polarizer 170 is in electrical contact with the guide bar 106, the second polarizer 170 is electrically connected to the guide bar 106, the guide panel 104 and the lower cover 102 , The static electricity of the second polarizing plate 170 is grounded and removed through the guide bar 106 and the guide panel 104 to the lower cover.

3A and 3B are diagrams showing the structures of the first polarizing plate 160 and the second polarizing plate 170, respectively.

As shown in FIG. 3A, the first polarizer 160 includes a first support 162 and a first polarizer 164. The first polarizer 164 is a film that can convert natural light into arbitrary polarized light. At this time, when the incident light is divided into two polarizing components orthogonal to each other, the first polarizing member 164 has a function of allowing one polarized component of two polarized components to pass through and absorbing, reflecting, or scattering other polarized components May be used. The optical film used for the first polarizer 164 is not particularly limited. For example, a polymer film containing polyvinyl alcohol (PVA) based resin containing iodine or dichroic dye as a main component, 2 An O-type polarizer in which a liquid crystal composition containing a coloring material and a liquid crystal compound are aligned in a certain direction, and an E-type polarizer in which a lyotropic liquid crystal is oriented in a certain direction. The first support 162 serves to protect the first polarizer 164 and is formed of a general protection film having no retardation. Any of these protective films can be used, but mainly triacetylcellulose (TAC) is used.

3B, the second polarizer 170 includes a second support 172, a second polarizer 174 formed on one side of the second support 172, a second polarizer 174, A third support 176 formed on the third support 176, and a sealant layer 177 formed on the third support 176.

The second support body 172 and the third support body 176 are disposed with the second polarizer 174 interposed therebetween. Like the first support body 162 of the first polarizer plate 160, Do not use protective film. The second polarizer 174 may be a polymer film mainly composed of a polyvinyl alcohol (PVA) based resin containing iodine or a dichroic dye in the same manner as the first polarizer 164, An O-type polarizer in which a liquid crystal composition containing a liquid crystal compound is oriented in a certain direction, and an E-type polarizer in which a lyotropic liquid crystal is aligned in a certain direction.

The adhesive layer 177 is a pressure-sensitive adhesive or an adhesive. As the pressure-sensitive adhesive, an acrylic or silicone-based material is mainly used. As the adhesive, a UV-curable or thermosetting substance such as an epoxy-

The adhesion layer 177 has conductivity. In order to impart such conductivity, a powder-type conductive member having good conductivity such as a metal or the like is dispersed in the adhesion layer 177. At this time, the form of the powder-form conductive member is a conductive member having various shapes such as a ball shape, a cylindrical shape, a polygonal shape and the like having a size of several tens nm to several 탆, and the density thereof can be set differently according to the conductivity of the adhesion layer.

When the resistance of the adhesion layer 177 is 10 ¹³ ? / Cm ² or more, the static elimination performance is deteriorated. When the resistance of the adhesion layer 177 is 10 ⁶ ? / Cm ² or less, The detection of the touch signal by the touch sensor 177 deteriorates the recognition of the touch electrode. Therefore, in the present invention, the resistance of the sealant layer 177 is 10 ⁶ -10 ¹³ Ω / cm ² , preferably 10 ⁹ -10 ¹¹ Ω / cm ² , and the density of the conductive member included in the adhesion layer 177 is determined so as to correspond to the resistance value.

The adhesion layer 177 is formed on the lower part of the second polarizing plate 170 and the lower surface of the second polarizing plate 170 is attached to the guide bar 106 so that the adhesion layer 177 having conductivity is formed on the guide bar 106 As shown in Fig.

When a user touches a screen of a liquid crystal display device using a touch mechanism such as a finger or a pen in a liquid crystal display device having such a structure, the touch of the user is sensed by a touch electrode formed in the liquid crystal panel 110, .

Static electricity is generated in the liquid crystal display element upon touching. Such static electricity causes distortion of the liquid crystal molecules in the liquid crystal layer of the liquid crystal panel, especially the IPS mode liquid crystal panel or the FFS mode liquid crystal panel, and causes unevenness on the screen. The generated static electricity is collected by the conductive adhesive layer 177 of the second polarizing plate 170 and is then grounded and removed by the lower cover 102 via the guide bar 106 and the guide panel 104.

Although not shown in the drawing, a separate conductive tape may be provided between the second polarizer 170 and the guide bar 106 to electrically connect the adhesion layer of the second polarizer 170 and the guide bar 106. This conductive tape not only improves the adhesive property between the second polarizing plate 170 and the guide bar 106 but also reduces the contact resistance between the second polarizing plate 170 and the guide bar 106, .

In the conventional liquid crystal display device, the back electrode, which is formed on the back surface of the liquid crystal panel and removes static electricity, is made of a transparent conductive material such as ITO. Since the ITO has high conductivity (that is, In the case of the in-cell touch method in which a touch electrode is formed inside, there is a problem that a touch signal is detected by the ITO when the liquid crystal display device is touched, and the touch signal is not recognized on the touch electrode.

However, in the present invention, the bonding layer 177 of the second polarizing plate 170 is formed of a high resistivity of 10 ⁶ -10 ¹³ Ω / cm ² , preferably 10 ⁹ -10 ¹¹ Ω / cm ² , The touch signal can be detected by the touch electrode without being detected by the conductive adhesive layer 177 when the liquid crystal display device is touched.

As described above, the guide bar 106 is disposed to remove the static electricity by connecting the conductive polarizer 170 to the lower cover 102, that is, the ground. In this regard, the guide bar 106 is not a structural function but is used as a discharge path for discharging static electricity to the ground.

4 is a view showing another structure of a liquid crystal display element according to the present invention. In the liquid crystal display element having the structure shown in FIG. 2, the electrostatic discharge path is formed in units of modules, but in the liquid crystal display element of this structure, the electrostatic discharge path is formed in units of set, which is an external case of a mobile device do.

4, after the liquid crystal panel 210 and the backlight 290 are housed in the inner frame 202, the inner frame 202 is coupled with the outer frame 204 So that the liquid crystal panel 210 and the backlight 290 are assembled.

The liquid crystal panel 210 includes a first substrate 220 and a second substrate 230 and a liquid crystal layer formed between the first substrate 220 and the second substrate 230. The backlight 290 includes a liquid crystal layer, A light source 291 disposed at a lower portion of the panel 210 to emit light; a light guide 291 disposed at a lower portion of the liquid crystal panel 210 to guide light emitted from the light source 291 to the liquid crystal panel 210; An optical sheet 293 disposed between the liquid crystal panel 210 and the light guide plate 293 and made of a diffusion sheet and a prism sheet which is guided by the light guide plate 293 to diffuse and condense light supplied to the liquid crystal panel 210 And a reflection plate 294 disposed below the light guide plate 293 and reflecting the light guided to the lower portion of the light guide plate 293.

The inner frame 202 is a module unit structure for assembling the liquid crystal panel 210 and the backlight 290 as components corresponding to the lower cover and the guide panel shown in FIG. Of course, the inner frame 202 is not limited to the structure shown in FIG. 2, but may have various structures depending on the size and shape of the liquid crystal display device. In other words, the inner frame 202 will include all currently known modular structures.

The external frame 202 is an external case of the electronic apparatus on which the liquid crystal module is mounted. The outer frame 202 may be formed of a metal having good conductivity or may be formed by applying a metal film to plastic having good moldability. At this time, the inner frame 202 and the outer frame 204 may be coupled by a mechanical means such as a screw, or may be made of an adhesive or the like.

A first polarizer 260 and a second polarizer 270 are attached to the lower surface and the upper surface of the liquid crystal panel 210, respectively. The first polarizer 260 is formed in a smaller area than the liquid crystal panel 210 and is housed in the inner frame 202. The second polarizer 260 is formed in a larger area than the liquid crystal panel 210, 204, respectively.

As shown in the figure, a step is formed on the outer frame 204, and the second polarizer 270 is placed on the step. Since the second polarizer 270 has the structure shown in FIG. 3B, the second polarizer 270 is attached to the liquid crystal panel 210 by the conductive adhesive layer formed at the bottom of the second polarizer 270 At the same time, the second polarizing plate 270 is fixed by attaching (or contacting) the adhesion layer to the step of the external frame 204.

In the liquid crystal display element having the structure shown in FIG. 2, the conductive adhesive layer of the second polarizer contacts the module of the liquid crystal display element to discharge the static electricity. In the liquid crystal display element of this structure, Static electricity is removed by direct contact.

Since the external frame 204 has a rectangular shape that is substantially the same as the shape of the liquid crystal panel, the conductive adhesive layer of the second polarizer 270 is electrically connected to the external frame 204 along the four sides of the rectangular frame. Therefore, compared with the case of using a separate electrical contact means such as a silver dot (in the case of forming a static discharge path by forming a dot only in a specific region such as a region corresponding to an edge region of the liquid crystal panel) The electrostatic discharge efficiency (electrostatic discharge efficiency) can be improved.

In addition, as shown in the figure, a conductive tape 206 may be disposed between the second polarizer 270 and the external frame 204. Since the conductive tape 206 can be formed in various thicknesses, the gap between the second polarizer 270 and the external frame 204 can be adjusted by disposing the conductive tape 206. In addition, since the conductive tape 206 has elasticity, when the impact is applied to the assembled liquid crystal display device, the conductive tape 206 absorbs the impact, .

In addition, since the resistance of the conductive tape 206 is lower than that of the adhesion layer of the second polarizer 270, it is possible to reduce the contact resistance when the second polarizer 270 contacts and electrically connects to the external frame 204 So that static electricity can be effectively discharged through the external frame 204.

As described above, in the present invention, when the conductive second polarizing plate is disposed on the liquid crystal panel, the adhesive layer is brought into direct contact with the module of the liquid crystal display element or the set of the electronic apparatus equipped with the liquid crystal display element, Static electricity is grounded through the module or set.

At this time, the conductive second polarizer is imparted with conductivity by the adhesion layer, and a second polarizer having various structures may be used. The second polarized light of such various structures will be described in more detail.

5A to 5D are views showing another structure of the second polarizing plate according to the present invention.

5A, the second polarizer 170 includes a second support 172, a second polarizer 174 formed on one side of the second support 172, a second polarizer 174, And a bonding layer 177 formed on the third support body 176. The surface treatment layer 178 is formed on the upper surface of the second support body 172. [

If the second support 172 and the third support 176 use a protective film having no phase delay such as TAC, the second polarizer 174 may be made of polyvinyl alcohol containing iodine or a dichroic dye (PVA) based resin, an O-type polarizer in which a liquid crystal composition containing a dichroic substance and a liquid crystal compound is oriented in a certain direction, and an E-polarizer in which a lyotropic liquid crystal is aligned in a predetermined direction Type polarizer or the like is used.

The adhesive layer 177 is made of an acrylic or silicone material or a UV curable or thermosetting material such as an epoxy or acrylic material. In the adhesive layer 177, a powdery conductive material having good conductivity such as metal is dispersed So that it has conductivity.

A surface treatment layer 178 is formed on the upper surface of the second polarizer 170, that is, the outer surface of the second support 172. The surface treatment layer 178 improves the hardness of the second polarizer 170 and prevents the liquid crystal display device from being thinned and lightweight by not providing a separate protective glass when assembling the liquid crystal display device, It can also save money.

The surface treatment layer 178 may be formed by dissolving an acrylic material in a solvent and applying it to the outer surface of the second support 172 and then applying heat to evaporate the solvent or dissolving the acrylic material in a solvent to form a second support 172 ), And then chemically curing by irradiation with ultraviolet rays. The surface treatment layer 178 is formed to a thickness of about 3-10 um.

In addition, the surface treatment layer 178 is not limited to a specific material such as an acrylic material, but various materials capable of enhancing hardness may be used. In addition, a bead of a polymer material or a silica material may be dispersed in the surface treatment layer 178, or layers of different materials may be repeatedly formed.

As described above, the surface treatment layer 178 improves the strength of the second polarizer 170 by forming a separate layer on the second support 172. From this point of view, the surface treatment layer 178 may be referred to as a 'polarizing plate surface protective layer' or a 'polarizing plate hardening layer'.

In the second polarizer 170 having the structure shown in FIG. 5B, the adhesion layer 177 without the third support is directly formed directly on the second polarizer 174. Although not shown in the drawings, the surface treatment layer may be formed on the upper surface of the second support body 172 at this time.

5C, in the second polarizing plate 170 of the present invention, a separate conductive layer 179 is provided between the third support 176 and the adhesion layer 177 on the inner side of the adhesion 177 .

2 and 4, the second polarizing plate 170 is in contact with the upper surface of the housing part 180 to be electrically connected. However, since the upper surface of the housing part 180 is formed to have a constant width, Only a constant width of the adhesion layer 177 of the two polarizing plate 170 is brought into contact. The removal efficiency of the static electricity that escapes to the storage part 180 through the adhesion layer 177 is determined according to the contact area between the adhesion layer 177 and the storage part 180. [

Since the resistance of the caking layer 177 is fixed, the electrical contact area between the caking layer 177 and the housing part 180 decreases when the width of the top surface of the housing part 180 is reduced, It is not efficiently reduced and the screen is speckled.

5C, a separate conductive layer 179 is formed between the third support 176 and the adhesion layer 177 to improve the conductivity of the second polarizer 170 to improve the adhesion between the adhesion layer 177 and the accommodating layer 177. [ Even when the electrical contact area between the electrodes 180 is small, the static electricity is smoothly discharged through the housing part 180.

At this time, the resistance of the conductive layer 179 is set to be smaller than the resistance of the adhesion layer 177 (10 ⁶ -10 ¹⁰ Ω / cm ² , preferably 10 ⁸ -10 ⁹ Ω / cm ² ) And the housing part 180 is small, the static electricity flows through the conductive layer 179, so that the static electricity can be smoothly discharged.

Although the conductive layer 179 is formed all over the third support 176 in the drawing, the conductive layer 179 may be formed only in a part of the third support 176. For example, the conductive layers 179 may be formed in a plurality of strips having a predetermined width and may be arranged in a horizontal direction or a vertical direction at regular intervals, or may be arranged so as to be perpendicular to each other in a matrix. In addition, the conductive layer 179 may be formed along a region where the conductive layer 179 is in contact with the accommodating portion 180. In this way, even when the conductive layer 179 is formed only on a part of the third support 176, the conductive layer 179 becomes a static movement path, so that the static electricity is smoothly discharged to the outside.

5C, the conductive layer 179 may be formed between the third support 176 and the adhesion layer 177, but the third support 176 may be formed between the polarizer 174 and the second support 176, Or may be formed between the adhesion layer 177. Also in this structure, the surface treatment layer may be formed on the outer surface of the second support body 172.

The second polarizing plate 170 having the structure shown in FIG. 5D has the first surface treatment layer 178a and the second surface treatment layer 178b formed on the upper and lower surfaces of the second support 172, respectively. Since the first surface treatment layer 178a and the second surface treatment layer 178b improve the hardness of the second polarizing plate 170, a separate protective glass is not required for the liquid crystal display device.

The first surface treatment layer 178a and the second surface treatment layer 178b are formed by dissolving an acrylic material in a solvent and applying the same to the outer surface of the second support 172 and then applying heat to evaporate the solvent, After the material is dissolved in a solvent and applied to the outer surface of the second support 172, it is chemically cured by irradiation with ultraviolet rays to be formed to a thickness of about 3-10 um.

The first surface treatment layer 178a and the second surface treatment layer 178b are not limited to specific materials such as acrylic materials, but various materials capable of enhancing hardness can be used. In addition, a polymer material or a bead of silica may be dispersed in the first surface treatment layer 178a and the second surface treatment layer 178b, or layers of different materials may be repeatedly formed.

Although not shown in the drawing, a conductive layer may be formed over the entire area or a partial area between the third support layer 176 and the adhesion layer 177 in the second polarizer 170 having the above structure to improve the electrostatic discharge efficiency have.

As described above, in the present invention, the second polarizing plate 170 is formed in various structures. However, the present invention is not limited to the polarizer of the structure shown in Fig. That is, in the present invention, if the conductive adhesive layer 177 is formed only on the lower surface of the second polarizing plate 170 so that the static electricity of the liquid crystal display element can be discharged by contacting the module or the set of the liquid crystal display element, Can also be used. That is, in the present invention, the second support 172, the polarizer 174, the third support 176, the surface treatment layer, and the like may be arranged in various forms.

Meanwhile, in the present invention, a static electricity generated in the liquid crystal display element is removed by imparting conductivity to a cemented layer formed under the polarizer, but the present invention is not limited to this structure. In the present invention, since the discharge path of the static electricity forms a static electricity discharge path directly to an external structure other than the liquid crystal panel, for example, a module structure for assembling the liquid crystal panel and a set outer case of the electronic product, The structure is also possible.

6A and 6B are views showing the structure of a liquid crystal display according to another embodiment of the present invention.

6A, in the liquid crystal display device of this embodiment, the liquid crystal panel 310 in which the first substrate 320 and the second substrate 330 are attached is housed in the receiving portion 302. The housing part 302 may be a module structure of a liquid crystal display device, for example, a guide panel, a lower cover, and a guide bar of a module unit shown in FIG. 2, It is possible.

A first polarizing plate 360 and a second polarizing plate 370 are attached to the upper and lower surfaces of the liquid crystal panel 310 accommodated in the receiving portion 302 to adjust the transmittance of light transmitted through the liquid crystal panel 310, And implements the image.

A protective film 380 is attached on the upper surface of the liquid crystal panel 310 and the second polarizer 370. The protective film 380 is formed of a support 381 and a lower adhesion layer 382 and attached to the second polarizer 370 of the liquid crystal panel 310. At this time, the adhesion layer 382 uses a UV curing or a thermosetting material such as an acrylic or silicone material, or an epoxy or acrylic material. remind

The adhesion layer 382 has conductivity. In order to impart such conductivity, a powdery conductive material having good conductivity such as a metal is dispersed in the adhesion layer 382. At this time, the form of the powder-form conductive member is a conductive member having various shapes such as a ball shape, a cylindrical shape, a polygonal shape and the like having a size of several tens nm to several 탆, and the density thereof can be set differently according to the conductivity of the adhesion layer.

The adhesion layer 382 adheres to and comes into contact with the upper surface of the storage portion 302. At this time, since the accommodating portion 302 is formed of a material having good conductivity such as metal, the cohesive layer 382 and the accommodating portion 302 form an electrostatic discharge path. Accordingly, when the static electricity is discharged to the liquid crystal display element, it can be grounded to the storage portion 302 through the discharge path and removed.

Although the protective film 380 has a simple structure of the support 381 and the conductive adhesive layer 382 in the figure, the entire area of the support 381 or part of the support 381 may be interposed between the adhesive layers 382 of the support 381 The conductive layer may be formed in the region. The surface treatment layer may be formed on one side or both sides of the support 381, or a plurality of supports 381 may be provided.

In this embodiment, since the second polarizing plate 370 on the liquid crystal panel 310 is formed in a non-conductive manner, static electricity is not discharged through the second polarizing plate 370 but the liquid crystal panel 310 is protected The liquid crystal panel 310 can be protected by providing conductivity to the protection film 380 and by electrically contacting the protection film 380 with the storage part 302 as well as effectively removing the static electricity with a simple structure It might be.

6B, in the liquid crystal display device of this embodiment, the liquid crystal panel 310 in which the first substrate 320 and the second substrate 330 are bonded is housed in the housing 302. The housing part 302 may be a module structure of a liquid crystal display device, for example, a guide panel, a lower cover, and a guide bar of a module unit shown in FIG. 2, It is possible.

A protective film 380 is attached to the upper surface of the liquid crystal panel 310. The protective film 380 includes a support 381 and a sealant layer 382 formed on the support 381 and having a conductive property dispersed therein.

In the structure of FIG. 6A, the protective film 380 is attached to the upper surface of the second polarizer, but in this structure, the protective film 380 is directly attached to the upper surface of the liquid crystal panel 310. At this time, although not shown in the drawing, a polarizing plate may be disposed on the lower surface of the liquid crystal panel 310 and the upper surface of the protective film 380, respectively.

Since the area of the protective film 380 is larger than the area of the liquid crystal panel 310, the outer area of the protective film 380 extends to the outer surface of the liquid crystal panel 310, 382 to the upper surface of the accommodating portion 302. The static electricity generated in the liquid crystal display element is collected in the adhesion layer 382 and then grounded through the storage part 320 to be removed do.

As described above, in the present invention, since the conductive polarizer or the conductive protective film is directly contacted with the structure of the liquid crystal display device such as a module or a set to form a static electricity discharging path to ground the static electricity, The manufacturing cost can be reduced as well as the manufacturing process can be simplified as compared with the use of the means.

In the drawings and the foregoing detailed description, the structure of the present invention is described as being characterized by a specific structure, but the present invention is not limited to such a liquid crystal display element. For example, the present invention is applicable to all currently known structures of liquid crystal panels, and polarizers and protective films will also be capable of various combinations of constituents.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Accordingly, the invention is not to be determined by the embodiments described, but should be determined by equivalents to the appended claims and the appended claims.

110: liquid crystal panel 160: first polarizer plate
170: second polarizer 172, 176:
174: Polarizer 177: Adhesive layer
190: Backlight

Claims (25)

A liquid crystal panel;
A receiving portion for receiving and fixing the liquid crystal panel;
A first polarizer attached to a lower surface of the liquid crystal panel; And
And a second polarizer attached to an upper surface of the liquid crystal panel, the second polarizer being connected to the liquid crystal panel by direct electrical connection to ground the static electricity generated by the liquid crystal panel to the receiving portion. The apparatus according to claim 1,
A lower cover;
A guide panel coupled to the lower cover to assemble the liquid crystal panel; And
And a conductive guide bar which is coupled to the guide panel and which is in contact with the conductive adhesive layer of the second polarizer plate to discharge static electricity generated in the liquid crystal panel. The liquid crystal display element according to claim 1, wherein the housing part is in contact with the conductive adhesive layer of the second polarizer plate and is an electronic device enclosure including a liquid crystal panel. The liquid crystal display device according to claim 1, further comprising a touch electrode disposed inside the liquid crystal panel for recognizing a user's touch. The liquid crystal display element according to claim 1, wherein the adhesion layer is dispersed in the conductive member. The liquid crystal display element according to claim 1, wherein the resistance of the adhesion layer is 10 ⁶ -10 ¹³ Ω / cm ² . The method of claim 6, wherein the liquid crystal display element, characterized in that the resistance of the laminating layer is 10 ⁹ -10 ^11. The liquid crystal display of claim 1, wherein the second polarizer comprises:
A first support;
A polarizer formed on a first surface of the first support; And
And a conductive adhesive layer formed on the polarizer. The liquid crystal display element according to claim 8, further comprising a first surface treatment layer formed on a second surface of the first support. The liquid crystal display element according to claim 8, further comprising a second support disposed between the first support and the polarizer. The liquid crystal display element according to claim 10, further comprising a second surface treatment layer disposed on a second surface of the first support. The liquid crystal display device according to claim 9 or 12, wherein the first surface treatment layer and the second surface treatment layer are made of an acrylic material. The liquid crystal display element according to claim 10, further comprising a conductive layer disposed between the second support and the conductive adhesive layer. 14. The liquid crystal display element according to claim 13, wherein the conductive layer is disposed over the entire conductive adhesion layer. 14. The liquid crystal display according to claim 13, wherein the conductive layers are arranged in a matrix shape in a predetermined direction of the conductive adhesive layer or vertically to each other in a strip shape having a predetermined width. A liquid crystal panel;
A receiving portion for receiving and fixing the liquid crystal panel;
And a protection film disposed on the upper surface of the liquid crystal panel, the protection film being electrically connected to the liquid crystal panel and grounding the static electricity generated in the liquid crystal panel to the storage portion. The method according to claim 16,
A support; And
And a conductive adhesive layer formed on one surface of the support. The liquid crystal display device according to claim 16, wherein the adhesion layer of the protective film is directly attached to the liquid crystal panel. The liquid crystal display according to claim 18, wherein a first polarizing plate and a second polarizing plate are attached to the lower surface and the upper surface of the liquid crystal display, respectively, and the adhesion layer of the protective film is attached to the second polarizing plate. 17. The liquid crystal display device of claim 16, further comprising a touch electrode disposed inside the liquid crystal panel for recognizing a user's touch. A liquid crystal panel;
A receiving portion for receiving and fixing the liquid crystal panel; And
And a static electricity discharge path electrically connected to the storage part and configured to discharge static electricity formed on the liquid crystal panel to the storage part to ground the static electricity. The liquid crystal display device according to claim 21, further comprising a first polarizing plate and a second polarizing plate respectively disposed on the lower surface and the upper surface of the liquid crystal panel. The liquid crystal display device according to claim 22, wherein the electrostatic discharge path includes a conductive adhesion layer formed on the second polarizer and electrically connected to the storage part. The liquid crystal display device according to claim 21, wherein the electrostatic discharge path includes a protective film including a conductive adhesive layer attached to an upper surface of the liquid crystal panel and electrically connected to the receiving portion. 22. The liquid crystal display device according to claim 21, further comprising a touch electrode disposed inside the liquid crystal panel for recognizing a user's touch.

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