KR20140141165A - Liquid crystal display device and method of fabricating the same - Google Patents

Abstract

The present invention provides a liquid crystal display device and a manufacturing method thereof. The liquid crystal display device includes a liquid crystal panel which includes a first substrate which includes gate and data wires to intersect each other, a thin film transistor which is connected to two wires and a pixel electrode which is connected to one electrode of the thin film transistor, a second substrate which faces the first substrate and includes a color filer layer, and a liquid crystal layer which is interposed between two substrates, a first polarization plate which is formed on the outer side of the first substrate, has a smaller area than the first substrate, and completely overlaps the first substrate to be attached, a second polarization plate which is formed on the outer side of the second substrate, has a larger area than the second substrate, and is attached on the outside of each edge of the second substrate with an exposed state of a first width, and a side sealing agent which covers the side of the liquid crystal panel and coincides with the end of the second polarization plate.

Description

[0001] The present invention relates to a liquid crystal display device and a manufacturing method thereof,

The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display capable of improving rigidity due to an external impact and capable of modularization without a cover glass when implementing an LCD product such as a TV or a monitor, and a method of manufacturing the same.

A liquid crystal display device (LCD) which is actively used for a TV, a monitor, and a mobile phone has an advantage of being excellent in moving image display and having a high contrast ratio, and exhibits optical anisotropy and polarization properties polarization.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. To this end, a backlight unit having a built-in light source is disposed on the back surface of the liquid crystal panel.

The liquid crystal panel and the backlight unit are modularized by the case top, the support main, and the cover bottom.

1 is a cross-sectional view of a general liquid crystal display device.

As shown in the figure, a typical liquid crystal display device includes a liquid crystal panel 10, a backlight unit 20, a support main 30, a cover bottom 50, and a top cover 40.

In this case, the liquid crystal panel 10 is composed of first and second substrates 12 and 14, which play a key role in image display, and which are adhered to each other with a liquid crystal layer interposed therebetween, First and second polarizers 19a and 19b for controlling the polarization direction of light are provided on the outer sides of the substrates 12 and 14, respectively.

The first and second polarizing plates 19a and 19b typically have an area smaller than that of the liquid crystal panel 10 and are provided corresponding to a part of the display area and a part of the non-display area for displaying an actual image.

Further, a backlight unit 20 is provided behind the liquid crystal panel 10.

The backlight unit 20 includes an LED assembly 29 arranged along the longitudinal direction of at least one side edge of the support main body 30, a white or silver reflective plate 25 seated on the cover bottom 50, A light guide plate 23 that is seated on the light guide plate 25, and a plurality of optical sheets 21 interposed therebetween.

The LED assembly 29 is formed on one side of the light guide plate 23 and includes a plurality of LEDs 29a emitting white light and an LED PCB 29b mounted with the LEDs 29a.

The liquid crystal panel 10 and the backlight unit 20 are covered with a top cover 40 covering the upper edge of the liquid crystal panel 10 in a state where the edge is surrounded by the support main 30 having a rectangular frame shape, And the cover bottoms 50 are integrally joined to each other through the support main body 30.

A liquid crystal display device having such a configuration is used in the manufacture of an end product of a liquid crystal display device such as a TV and a monitor. In general, a liquid crystal display device having the above-described configuration is shown in Fig. 2 (a liquid crystal display device including a conventional liquid crystal display device A front cover 75 for accommodating the liquid crystal display device and a rear cover 70 fastened to the front cover 75 are provided between the rear cover 70 and the rear surface of the liquid crystal display device, A system board 90 is further provided and a cover glass 80 is further provided on the front surface of the front cover 80 to protect the display area of the liquid crystal display device.

At this time, the front cover 75 and the rear cover 70 are fastened together by fastening means 77 provided at both outer ends of the liquid crystal panel 10 to form a finished product of a liquid crystal display device such as a TV or a monitor.

The liquid crystal panel 10 is structured to be protected by the cover glass 80 and the front or rear covers 75 and 70 in the finished product of the liquid crystal display device having such a configuration, (75) and the rear cover (70) are engaged, the width of the non-display area is very wide.

In recent display devices, a narrow bezel structure that minimizes a non-display area for enhancing user's immersion and a good design is required, and further, a lightweight thin type display device is sought.

Accordingly, in order to meet such a trend, a configuration has been proposed in which the display glass of the finished product type is removed from the cover glass 80 to realize a lightweight thin type display.

The finished product including the liquid crystal display device and having the structure in which the cover glass is removed has a structure in which the liquid crystal display device is directly exposed to the outside and further the front cover is also removed so that the rear cover and the support main are connected to the fastening means And is in contact with the side surface of the rear cover on the side surface of the liquid crystal panel.

Therefore, the finished product of the liquid crystal display device in which the cover glass and the front cover are removed is very vulnerable to an external impact, and in particular, when impact is applied to the side surface of the liquid crystal panel, a crack or the like is generated to increase the defect rate.

Further, since the liquid crystal panel does not have a portion covered by the front cover, light exiting toward the side of the liquid crystal panel is reflected through the side surface of the rear cover, so that light leakage occurs at the edge of the display region. So that foreign matters can be easily inserted into the device, thereby improving the appearance of the product.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a liquid crystal display device which is improved in rigidity so as to suppress cracks due to an external impact, And it is an object of the present invention to provide a liquid crystal display device which is capable of realizing a design that is as flexible as possible.

In order to achieve the above-mentioned object, a liquid crystal display device according to an embodiment of the present invention includes gate and data lines crossing each other, a thin film transistor connected to the two lines, and one electrode of the thin film transistor A liquid crystal panel including a liquid crystal layer interposed between the first substrate and the second substrate, the second substrate having a color filter layer facing the first substrate; A first polarizer provided on an outer surface of the first substrate and having an area smaller than that of the first substrate and completely overlapped with the first substrate; A second polarizer provided on an outer surface of the second substrate and having a larger area than the second substrate and having a first width exposed to the outside of each corner of the second substrate; And a side sealing agent covering the side edge of the liquid crystal panel and coinciding with an end of the second polarizing plate.

The liquid crystal display device includes: a support main body on which the liquid crystal panel is mounted; A backlight unit provided on a bottom surface of the support main body; A cover bottom covering the bottom surface of the backlight unit and contacting the support main side; A system board provided on the cover bottom face; And a rear cover covering a back surface of the system board and having a side edge of the liquid crystal panel mounted thereon and assembled with the support main body, wherein the side sealing member provided on the side of the liquid crystal panel contacts the side sealing member .

In addition, a common electrode in the form of a plate may be provided on the inner surface of the second substrate and the color filter layer may be formed on the inner surface of the second substrate, or the same material may be formed on the inner surface of the first substrate, And a common electrode alternating with the pixel electrode and connected to the common wiring, or a pixel electrode and a common electrode overlapping the pixel electrode and the insulating layer by resuming the pixel electrode and the common electrode, The upper electrode may be provided with a plurality of openings in the form of a bar.

And the first width is 0.2 to 0.4 mm.

Further, the backlight unit includes a reflection plate, a plurality of optical sheets, and a light source.

A method of manufacturing a liquid crystal display device according to an embodiment of the present invention includes forming a gate electrode and a data line crossing each other, a thin film transistor formed by connecting the two lines, and a pixel electrode connected to one electrode of the thin film transistor 1 substrate and a second substrate provided with a color filter layer are positioned so that the pixel electrode and the color filter layer face each other, and the liquid crystal layer is resumed and attached to form a liquid crystal panel; Attaching a first polarizing plate having an area smaller than that of the first substrate on the outer surface of the first substrate of the liquid crystal panel so as to completely overlap the first substrate; Attaching a second polarizer having an area larger than that of the second substrate on the outer side of the second substrate of the liquid crystal panel so as to form a first width exposed outside each corner of the second substrate; Forming a side sealing agent by applying the liquid sealing agent on the side of the liquid crystal panel by using a coating means; The second polarizer is cut out to expose a second width smaller than the first width to the outside of the second substrate by irradiating the upper portion of the second polarizer with a laser beam using a laser cutting device, So that the end of the second polarizing plate and the end of the side sealing agent coincide with each other.

At this time, the first width is larger than 0.4 mm, and the second width is 0.2 to 0.4 mm.

And forming a common electrode on the second substrate by covering the color filter layer or forming a common electrode on the first substrate in parallel with the gate electrode, A common electrode overlapping the pixel electrode and the insulating layer is formed on the first substrate and a plurality of bars are formed on the pixel electrode or the common electrode, Shaped opening.

The liquid crystal panel having the first and second polarizing plates and the side sealing agent is placed on a support main body, the backlight unit is fastened to the bottom surface of the support main body, the bottom surface of the backlight unit is covered, And tightening a rear cover covering a rear surface of the system board, which is assembled with the support main body and has a side edge of the liquid crystal panel, And the side sealing member provided on the side of the liquid crystal panel is in contact with the side surface of the rear cover.

As described above, the liquid crystal display according to the embodiment of the present invention is provided with the side sealing material on the side surface of the liquid crystal panel so as to coincide with the end of the second polarizing plate provided on the outer surface of the second substrate.

Therefore, even if an impact is applied from the outside, the external shock can be buffered by the side sealing agent on the side surface of the liquid crystal panel, so that the rigidity of the finished product of the liquid crystal display device is improved.

Further, since the liquid crystal display according to the embodiment of the present invention can be fastened to the gear cover without the cover glass and the front cover in a state where the rigidity is improved by the side sealing agent, the width of the non- It is effective to realize a narrow bezel and to provide a lightweight thin display device.

In addition, since the sides of the liquid crystal panel and the side surfaces of the rear cover are in close contact with the side sealing members and the side surfaces of the second polarizer, contamination can be prevented because there is no room for foreign matter to intervene between the rear cover and the liquid crystal panel. Since the side sealing agent is not exposed to the outside of the side end, the appearance design becomes effective.

The side sealing agent is made of a black color so that even when light incident on the backlight unit is guided to the side of the liquid crystal panel along the first or second substrate surface, the side sealing agent is absorbed, And a phenomenon in which light leakage is generated by the light guided along the second substrate surface.

1 is a cross-sectional view of a general liquid crystal display device
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device.
3 is a cross-sectional view of a liquid crystal display device including an LCD according to an embodiment of the present invention.
4 is a cross-sectional view of a part of a liquid crystal panel, which is a component of a liquid crystal display device according to an embodiment of the present invention.
5A to 5F are cross-sectional views illustrating steps of manufacturing a liquid crystal display device according to an exemplary embodiment of the present invention.
6A to 6F are cross-sectional views illustrating steps of manufacturing a liquid crystal display device according to a comparative example.

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

3 is a cross-sectional view of an LCD device according to an embodiment of the present invention.

As shown, a finished product 100 of a liquid crystal display device such as a TV and a monitor includes a liquid crystal display including a liquid crystal panel and a backlight unit for realizing an image, a rear cover 170 for accommodating the liquid crystal display, And a system board 190.

Here, the liquid crystal display device includes a liquid crystal panel 110, a printed circuit board 142 for applying an image signal to the liquid crystal panel 110, a backlight unit 120, A support main body 130 and a cover bottom 150.

First, as shown in FIG. 4 (a cross-sectional view of a part of the liquid crystal panel, which is one component of the liquid crystal display device according to the embodiment of the present invention), the liquid crystal panel 110 will be described in detail. And includes a first substrate 112 and a second substrate 114 which are in contact with each other with a liquid crystal layer interposed therebetween.

At this time, a plurality of pixel regions P are defined on the inner surface of the first substrate 112 by intersecting a plurality of gate wirings (not shown) and the data wirings 230 with the gate insulating layer 210 interposed therebetween, Each pixel region P is provided with a thin film transistor (Tr) which is connected to the gate and data lines (not shown) and is a switching element.

In each pixel region P, a pixel electrode 250 is formed in contact with the drain electrode 236 of the thin film transistor Tr.

On the inner surface of the second substrate 114 facing the first substrate 112 having such a configuration, red (R), green (G), and blue (B) color filters 275b and 275c and the respective color filter patterns 275a, 275b and 275c in correspondence with the boundary between the pixel regions P and the gate wiring (not shown) And a black matrix 272 covering the data lines 230 and the thin film transistors Tr.

A common electrode 278 covering the color filter layer 275 and the black matrix 272 and made of a transparent conductive material is provided on the inner surface of the second substrate 114 on the entire display area.

The first and second polarizers 119a and 119b selectively transmit only specific light to the outer surfaces of the first and second substrates 112 and 114 of the liquid crystal panel 110, have.

Here, the second polarizer 119b provided on the outer surface of the second substrate 114, as one of the most characteristic structures of the liquid crystal display according to the embodiment of the present invention, And the second substrate 114 is completely overlapped with the second substrate 114 and has a width of 0.2 to 0.4 mm larger than each corner of the second substrate 114.

The first polarizing plate 119a has an area smaller than the area of the first substrate 112 and overlaps the front surface of the first substrate 112 with respect to the display area of the first substrate 112, Respectively.

One of the most distinctive features of the liquid crystal display according to the embodiment of the present invention is a side surface including a pad portion to which a printed circuit board 142 including a driver circuit among the side ends of the liquid crystal panel 110 is connected And a side sealing agent 117 having elasticity and absorbing an external impact is provided on the other side except for the side sealing agent.

Another feature of the present invention is that the end of the second polarizer 119b exposed to the outside of each side of the second substrate 114 and the side of the side sealing agent 117 coincide with each other.

This is due to the method of manufacturing the liquid crystal display device according to the embodiment of the present invention, and will be described in detail through a later manufacturing method.

The printed circuit board 142 is connected to at least one edge of the liquid crystal panel 110 via a connection member 140 such as a flexible printed board (FPC) or a tape carrier package (TCP) This is connected.

On the other hand, in the liquid crystal panel 110 having such a configuration, the thin film transistor Tr selected for each gate wiring (not shown) is turned on by an on / off signal of a gate driving circuit to be transferred in a scan, The signal voltage of the data driving circuit is transmitted to the corresponding pixel electrode through the data line 230 and the arrangement of the liquid crystal molecules in the liquid crystal layer by the electric field between the pixel electrode 250 and the common electrode 278 The direction is changed and the image is displayed by showing the difference in transmittance.

In the liquid crystal panel 110, the arrangement of the pixel electrode 250 and the common electrode 278 may be different depending on the driving mode of the liquid crystal display device.

The liquid crystal panel 110 in which the pixel electrode 250 is formed on the first substrate 112 and the common electrode 278 is provided on the second substrate 114 is a liquid crystal display device that operates in a twisted nematic mode, And may be operated in various modes depending on the arrangement of the pixel electrode 250 and the common electrode 278.

For example, when the liquid crystal display device operates in the transverse electric field mode, the common electrode provided on the entire surface of the display region of the second substrate 114 is omitted, and the gate wiring (not shown) And a common electrode alehtl electrically connected to the common line alehtl is provided in each pixel region P so as to be spaced apart from the pixel electrode 250 .

In this case, the pixel electrode 250 and the common electrode (not shown) provided in each pixel region P form a bar and are arranged alternately.

In addition, when the liquid crystal display device operates in the fringe field switching mode, the common electrode 278 provided on the entire display area of the second substrate 114 is omitted, A common electrode (not shown) is disposed by resuming the pixel electrode 250 and the insulating layer (not shown) in the form of a plurality of And an opening in the form of a bar is provided.

The liquid crystal display device 100 including the liquid crystal panel 110 having various configurations includes a backlight unit 120 for supplying light from the rear surface of the liquid crystal display device 100 so that a difference in transmittance represented by the liquid crystal panel 110 is externally expressed, Respectively.

The backlight unit 120 includes a lamp 124 arranged along the longitudinal direction of at least one edge of the support main 130, a white or silver reflective plate 125, and a light guide plate 123 An LED assembly 129 which is a light source arranged corresponding to one side of the light guide plate 123 or opposite sides of the light guide plate 123 and a plurality of optical sheets 121 interposed on the light guide plate 123.

The LED assembly 129 is positioned on one side of the light guide plate 123 or on opposite sides of the light guide plate 123 so as to face the side surface of the light guide plate 123, respectively.

A heat sink 149 is provided to selectively contact the LED assembly 128 and simultaneously contact the cover bottom 165 to discharge heat generated from the LED assembly 129 to the outside.

In the drawing, the LED assembly 129 is formed only on one side surface of the light guide plate 123, for example.

In the embodiment of the present invention, the LED assembly 129 is provided as a light source in the backlight unit 120. However, instead of the LED assembly 129, a cold cathode fluorescent lamp Cathode Fluorescent Lamp (CCFL), and External Electrode Fluorescent Lamp.

When a light source is constituted by such a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp, a lamp housing (not shown) for reflecting light from the lamp (not shown) (Not shown) corresponding to one end of the light guide plate 123 and surrounds the lamp.

The light guide plate 123 uniformly spreads the light incident from the LED 129a as a light source to the wide area of the light guide plate 123 by advancing in the light guide plate 123 by total reflection, .

The light guide plate 123 may include a pattern of a specific pattern on the back surface to supply a uniform surface light source.

Here, the pattern may be formed in various shapes such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like in order to guide light incident into the light guide plate 123. The pattern is formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

The reflection plate 125 is disposed on the back surface of the light guide plate 123 and reflects the light that has passed through the back surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness and efficiency of light.

The optical sheet 121 positioned above the light guide plate 123 includes a diffusion sheet 121a and at least one light condensing sheet 121b.

The diffusion sheet 121a is positioned directly above the light guide plate 123 and serves to adjust the light direction so that the light travels toward the light converging sheet 121b while dispersing the light incident through the light guide plate 123 .

The light diffused through the diffusion sheet 121a is condensed in the direction of the liquid crystal panel 110 by the condensing sheet 121b. Accordingly, the light passing through the light condensing sheet 121b is mostly propagated perpendicularly to the liquid crystal panel 110.

The backlight unit 120 having such a structure is called a side light type and a plurality of LEDs 129a may be arranged in multiple layers along the longitudinal direction of one edge of the support main body 130, It is also possible to arrange them in parallel along the inner longitudinal direction of both edges of the support main body 130 facing each other.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the support main body 130 and the cover bottom 150.

The support main body 130 has a square shape with a protrusion 131 formed therein to divide the position of the liquid crystal panel 110 and the backlight unit 120 into the inside of the support main body 130 and surrounds the edge of the backlight unit 120 The liquid crystal panel 110 is seated and assembled with the cover bottom 150, and furthermore, it is fastened by a bolt, for example, as a rear cover and fastening means.

At this time, on the support main body on which the liquid crystal panel 110 is seated, a role as a shock absorber for shock absorption and an adhesion means for suppressing the flow of the liquid crystal panel 110 are provided so that the liquid crystal panel 110 is fixed .

The cover bottom 150, which is assembled with the support main body 130, serves to support the bottom of the support main.

The support main 130 may be referred to as a guide panel or a main support or a mold frame, and the cover bottom 150 may be referred to as a bottom cover or a bottom cover.

On the other hand, the system board 190 is mounted on the rear surface of the liquid crystal display device having such a configuration, that is, the back surface of the cover bottom 150.

An analog / digital (A / D) board (not shown) is connected to the system board 190 to receive external video or audio signals and transmit the signals to a liquid crystal panel 110 or a speaker An on-screen display (OSD) board (not shown) for controlling the functions related to the screen adjustment, an input / output unit (not shown) for controlling the functions of the LED 129a as a light source of the backlight unit 120, A speaker (not shown) for outputting a signal, an adapter (not shown) for supplying the entire power of the liquid crystal display device, and various cables (not shown).

The liquid crystal display device and the system board 190 are finally modularized through the rear cover 170. The rear cover 170 is coupled to the support main body 130 through bolts or other fastening means 177, do.

At this time, the side surface of the rear cover 170 is in contact with the side end of the liquid crystal panel 110 to further prevent the liquid crystal panel 110 from flowing. In the liquid crystal display device according to the embodiment of the present invention A second polarizer 119b provided on the outer surface of the second substrate 114, and a second polarizer 119b provided on the outer surface of the second substrate 114. The second polarizer 119b is disposed between the side of the liquid crystal panel 110 and the rear cover 170, The side sealing agent 117 is provided so as to coincide with the end of the side sealing agent 117.

Therefore, even if an impact is applied from the outside, the impact can be buffered by the side sealer 117 on the side surface of the liquid crystal panel 110, so that the rigidity of the LCD 100 is improved .

The side sealer 117 is made of a black color so that light incident on the backlight unit 120 is incident on the side of the liquid crystal panel 110 along the surface of the first or second substrate 112 or 114 It has an effect of originally suppressing the phenomenon that light is absorbed by the light guided along the surfaces of the first and second substrates 112 and 114 at the outermost portion of the display region even if the light is guided.

In the case of a display device (not shown) provided with a liquid crystal panel not provided with a conventional side sealing agent 117, light is reflected by the side surface of the rear cover and is emitted at the edge of the display area, The finished product 100 of the liquid crystal display device provided with the liquid crystal display device according to the embodiment of the present invention has an advantage that the light leakage in the display area tiburi portion can be originally suppressed.

On the other hand, when a pedestal (not shown) for maintaining the vertical state of the liquid crystal display device in the rear cover 170 is provided in the display device having such a configuration, the liquid crystal display device finished product (100) is completed.

Further, the liquid crystal display device according to the embodiment of the present invention having such a configuration is fastened to the rear cover 170 without the cover glass and the front cover in a state where the rigidity is improved by the side sealing agent 117, The width of the non-display area is reduced, thereby realizing a narrow bezel, and providing a lightweight, thin liquid crystal display finished product 100 by eliminating a cover glass and a front cover.

When the side edge of the liquid crystal panel 110 and the side surface of the rear cover 170 are in contact with the side edges of the side sealing agent 117 and the second polarizer plate 119b, the rear cover 170 and the liquid crystal panel 110 The side sealing agent 117 can be prevented from being contaminated and the side sealing agent 117 is not exposed outside the side end of the second polarizing plate 119b. Effect.

Hereinafter, a method of manufacturing a liquid crystal display device including the most characteristic configuration of the present invention in the finished product 100 of the liquid crystal display device having the above-described configuration will be described. Here, since the liquid crystal display device according to the embodiment of the present invention has a characteristic configuration of the liquid crystal panel 110, a manufacturing method of the liquid crystal panel 110 will be mainly described.

5A to 5E are cross-sectional views illustrating a manufacturing process of a liquid crystal display according to an exemplary embodiment of the present invention.

5A, a gate wiring (not shown) and a data wiring 230 crossing each other with a gate insulating film 210 therebetween and defining a plurality of pixel regions P, A thin film transistor Tr including a gate electrode 203, a gate insulating film 210 and a semiconductor layer 220 and source and drain electrodes 233 and 236 spaced from each other, The first substrate 112 including the pixel electrode 250 connected to the drain electrode 236 of the thin film transistor Tr is completed.

At this time, the first substrate 112 is formed with the same material in the same layer where the gate wiring (not shown) is formed according to the driving mode of the liquid crystal display device, and a plurality of common And a common electrode (not shown) connected to the common line (not shown) may be provided in parallel with the pixel electrode 250 and further provided with wiring lines (not shown).

A common electrode (not shown) may further be provided between the pixel electrode 250 and an insulating layer (not shown). In this case, the common electrode (not shown) (Not shown) is configured to have a plurality of bar-shaped openings.

Next, a color filter layer 275 having red, green and blue color filter patterns 275a, 275b and 275c is formed on the boundary of each pixel region P, and a black matrix 272 and pixel regions P, The second substrate 114 including the common electrode 278 covering the color filter layer 275 and covering the display region is completed.

At this time, the common electrode 278 provided on the second substrate 114 may be omitted when a common electrode (not shown) is provided on the first substrate 112.

In the drawing, the pixel electrode 250 is formed on the first substrate 112, and the common electrode 275 is formed on the second substrate 114, for example.

The first substrate 112 and the second substrate 114 are positioned so that the pixel electrode 250 faces the color filter layer 275 and a liquid crystal layer 280 is formed between the two substrates 112 and 114 A seal pattern (not shown) as an adhesive is formed along the rim of any one of the two substrates 112 and 114 and the two substrates 112 and 114 are joined together to form a liquid crystal panel 110 do.

At this time, the second substrate 114 and the FPC or tape carrier package, which is a subsequent connecting member (140 in Fig. 3), are resumed on the first substrate 112 of the first substrate 112, 3, 142) of the non-display region, and the side ends of the non-display region having the pad portion connected thereto are aligned. However, the non-display area provided with the pad portion connected to the printed circuit board (142 in FIG. 3) by resuming the FPC or the tape carrier package, which is the later connecting member (140 in FIG. 3) And exposed to the outside of the side ends of the second substrate 114.

Next, as shown in FIG. 5B, a first polarizer (not shown) is formed so as to overlap the front surface of the display area on the outer surface of the first substrate 112 of the panel and a part of the non-display area located outside the display area 119a.

Here, the first polarizing plate 119a has an area smaller than that of the first substrate 112.

5c, a second polarizing plate 119b having an area larger than the area of the second substrate 114 on the outer surface of the second substrate 114 is formed on the outer surface of the second substrate 114, Attach so that a width greater than 0.4 mm is exposed on each corner.

At this time, the second polarizing plate 119b is not exposed to the outside of the second substrate 114 exposing the non-display area connected to the printed circuit board 142 (see FIG. 3) That is, a predetermined width (width greater than 0.4 mm) is exposed to the side end of the second substrate 114 whose side ends coincide with the first substrate 112.

The second polarizer 119b is attached to the outer surface of the second substrate 114 such that the second polarizer 119b is exposed to the outside of the side end of the second substrate 114 in order to smoothly apply a liquid sealing agent .

5D, the liquid sealing agent is applied to the side of the liquid crystal panel 110 through the application means 195 such as a syringe, more precisely the second polarizing plate 119b contacts the second substrate 114 And is applied only to the side edge of the liquid crystal panel 110 exposed to the outside of the side edge at a predetermined width.

When the liquid sealing agent is applied to the side of the liquid crystal panel 110 through the application means 195, the second polarizing plate 119b exposed to the outside of the side end of the liquid crystal panel 110 is applied The liquid sealant applied by the means 195 prevents the liquid crystal panel 110 from being sprayed to the upper portion of the liquid crystal panel 110 other than the side ends of the liquid crystal panel 110. This suppresses surface contamination of the liquid crystal panel 110, An appropriate amount can be applied only to the side surface of the liquid crystal panel 110 without waste.

Accordingly, the second polarizing plate 119b functions as described above, that is, to prevent the surface of the liquid crystal panel 110 from being contaminated by the applied sealing agent, to suppress the waste of the side sealing agent 117, and to maintain proper application amount of the sealing agent The second substrate 114 is exposed at a predetermined width outside the side ends of the second substrate 114.

Thereafter, the sealing agent applied along the side edge of the liquid crystal panel 110 is dried and cured to form a side sealing agent 117 in a cured state on the side of the liquid crystal panel 110.

The cured side sealing agent 117 thus formed is exposed at the outside of the side end of the second polarizing plate 119b in the present state or there is a portion coinciding with the side end of the second polarizing plate 119b .

5E, when the side sealing agent 117 is cured, the laser cutting device is positioned above the second polarizing plate 119b and the laser beam is irradiated to the liquid crystal panel 110 The side edge of the second polarizer 119b and the side edge of the side sealing agent 117 are cut at the same time by cutting the side sealing agent 117 positioned below the predetermined width of the second polarizer 119b exposed to the outside of the side edge, To be consistent.

At this time, even if cutting is performed through the laser cutting device 197, the side of the second polarizing plate 119b is exposed to the outside of the side end of the liquid crystal panel 110 by about 0.2 to 0.4 mm.

Cutting is performed so that the side end of the second polarizing plate 119b and the side end of the side sealing agent 117 coincide with each other in the case where the liquid crystal display device including such a liquid crystal panel 110 is referred to as a liquid crystal display completed product 100), the side surface of the rear cover 170 (FIG. 3) and the side surface of the liquid crystal panel 110 come into contact with each other. At this time, the side sealing agent 117, The liquid crystal display device and the rear cover 170 are not easily fastened to each other and the second polarizing plate 119b is viewed by the user. When the second polarizing plate 119b is exposed to the outside of the second polarizing plate 119b, The side sealant 117 is exposed outside of the side surface of the rear cover 170 and the side surface of the second polarizer plate 119b is spaced apart from the side surface of the rear cover 170. As a result, The role of the sealing agent 117 There is a sense of lowering the appearance design caused at the same time, is to prevent this.

6A to 6C, the first and second polarizing plates 319a and 319b are disposed on the outer side of the first and second substrates 312 and 314, respectively, The second polarizing plate 319b is irradiated with a laser beam through the laser cutting device 397 preferentially to the second polarizing plate 319b so that the second polarizing plate 319b is irradiated with 0.2 The side sealing agent 317 may be formed by applying a liquid sealing agent through a coating device and then hardening the sealing agent so that the side sealing agent 317 is exposed.

However, in the case of the manufacturing method of the liquid crystal panel 310 according to this comparative example, since the second polarizing plate 319b is laser-cut while the side sealing agent 317 is not yet formed, The first and second substrates 312 and 314 are directly transferred to the first substrate 312 and the second substrate 314 so that deformation of the first and second substrates 312 and 314 may occur. In the process of fastening to the rear cover for the implementation of the finished display device, it is difficult to assemble, or it is more sensitive to the impact, so that the crazing may occur during the fastening process.

In the case of the comparative example, since the width of the second polarizing plate 319b exposed to the outside of the side end of the second substrate 314 is relatively smaller than that of the embodiment of the present invention, when the liquid sealing agent is applied, The side sealing agent 317 is applied to the end of the second polarizing plate 319b and to the side of the second polarizing plate 319b by applying a sealing agent after laser cutting the second polarizing plate 219b, It is not coincident but exposed to the outside.

In this case, as described above, there arises a problem of assembling in tightening with the rear cover, and the contamination of the side sealing agent and appearance design may be hindered.

In order to solve this problem, in the comparative example, the laser cutting is performed once more using the laser cutting device to remove the side sealing agent 317 exposed to the outside of the end of the second polarizing plate 319b to form the second polarizing plate 319b And the end of the side sealing agent 317 may coincide with each other. However, in this case, since the laser beam irradiation must be performed twice, the product productivity is lowered due to an increase in the number of steps, and the manufacturing cost is further increased.

Therefore, it can be seen that the manufacturing method of the liquid crystal panel 310 according to the embodiment of the present invention is superior to the manufacturing method of the liquid crystal panel 310 according to the comparative example.

3, after the liquid crystal panel 110 is completed by the manufacturing method according to the embodiment of the present invention, the support main 130, the backlight unit 120, And finally the cover 170 and the system board 190 are fastened to the liquid crystal display device so that the finished product of the liquid crystal display device such as a TV or a monitor Can be completed.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

110: liquid crystal panel
112: first substrate
114: second substrate
117: Side sealing agent
119a: first polarizer plate
119b: second polarizer plate
197: Laser cutting device

Claims (11)

A first substrate having gate and data lines crossing each other, a thin film transistor formed to be connected to the two lines and a pixel electrode connected to one electrode of the thin film transistor, and a color filter layer provided opposite to the first substrate A liquid crystal panel including a second substrate and a liquid crystal layer interposed between the two substrates;
A first polarizer provided on an outer surface of the first substrate and having an area smaller than that of the first substrate and completely overlapped with the first substrate;
A second polarizer provided on an outer surface of the second substrate and having a larger area than the second substrate and having a first width exposed to the outside of each corner of the second substrate;
A side sealing member covering the side edge of the liquid crystal panel and coinciding with the end of the second polarizing plate;
And the liquid crystal display device.
The method according to claim 1,
The liquid crystal display device includes: a support main body on which the liquid crystal panel is mounted;
A backlight unit provided on a bottom surface of the support main body;
A cover bottom covering the bottom surface of the backlight unit and contacting the support main side;
A system board provided on the cover bottom face;
A rear cover which covers the rear surface of the system board,
And the side sealant provided on the side of the liquid crystal panel is in contact with the side surface of the rear cover.
3. The method according to claim 1 or 2,
And a common electrode in the form of a plate is provided on an inner surface of the second substrate so as to cover the color filter layer.
3. The method according to claim 1 or 2,
On the inner surface of the first substrate,
And a common electrode alternating with the pixel electrode and connected to the common wiring, the common electrode being formed of the same material as the gate wiring and being spaced apart from each other in the same layer on which the gate wiring is formed.
3. The method according to claim 1 or 2,
On the inner surface of the first substrate,
Wherein the pixel electrode and the insulating layer are overlapped and overlapped with each other, a common electrode is provided, and an electrode located at an upper portion of the pixel electrode and the common electrode is provided with a plurality of openings in the form of a bar.
3. The method according to claim 1 or 2,
Wherein the first width is 0.2 to 0.4 mm.
3. The method according to claim 1 or 2,
Wherein the backlight unit includes a reflection plate, a plurality of optical sheets, and a light source.
A first substrate having a gate electrode and a data line intersecting each other, a thin film transistor connected to the two lines and a pixel electrode connected to one electrode of the thin film transistor, and a second substrate having a color filter layer, And the color filter layer are opposed to each other, and the liquid crystal layer is resumed to coalesce to form a liquid crystal panel;
Attaching a first polarizing plate having an area smaller than that of the first substrate on the outer surface of the first substrate of the liquid crystal panel so as to completely overlap the first substrate;
Attaching a second polarizer having an area larger than that of the second substrate on the outer side of the second substrate of the liquid crystal panel so as to form a first width exposed outside each corner of the second substrate;
Forming a side sealing agent by applying the liquid sealing agent on the side of the liquid crystal panel by using a coating means;
The second polarizer is cut out to expose a second width smaller than the first width to the outside of the second substrate by irradiating the upper portion of the second polarizer with a laser beam using a laser cutting device, So that the end of the second polarizing plate and the end of the side sealing agent coincide with each other
And the second electrode is electrically connected to the second electrode.
9. The method of claim 8,
Wherein the first width is larger than 0.4 mm, and the second width is 0.2 to 0.4 mm.
9. The method of claim 8,
Forming a common electrode on the second substrate by covering the color filter layer,
Forming a common wiring on the first substrate in parallel with the gate wiring and forming a common electrode connected to the common wiring and in parallel with the pixel electrode,
Forming a common electrode overlapping the pixel electrode and the insulating layer on the first substrate and forming a plurality of bar shaped openings on the pixel electrode or the common electrode;
And the second electrode is electrically connected to the second electrode.
9. The method of claim 8,
The liquid crystal panel including the first and second polarizing plates and the side sealing agent is placed on the support main body, the backlight unit is fastened to the bottom surface of the support main body, the bottom surface of the backlight unit is covered, Tightening the cover bottom, tightening the system board on the backside of the cover bottom, tightening the rear cover which covers the back side of the system board with the side edge of the liquid crystal panel,
And the side sealing material provided on the side of the liquid crystal panel is in contact with the side surface of the rear cover.

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