KR20070070403A - Liquid crystal display device and the fabrication method thereof - Google Patents

Abstract

A liquid crystal display device and a method for manufacturing the same are provided to prevent a light leakage and improve the picture quality by hardening a sealant of a liquid crystal panel with polarized ultraviolet rays and aligning rubbed alignment layers with ultraviolet rays, and thus improving an alignment characteristic and equally aligning liquid crystal. A liquid crystal display device has a first substrate(100) and a second substrate(110). Thin film transistors are formed on the first substrate. A sealant(103) is formed at an outer ring of the first substrate and the second substrate. A first alignment layer and a second alignment layer(101) are firstly aligned on the first substrate and the second substrate, and at the same time, secondary alignment process is performed to the first alignment layer and the second alignment layer.

Description

Liquid crystal display device and its manufacturing method

1 is a block diagram illustrating a method of manufacturing a liquid crystal display device according to the prior art.

Figure 2 is a cross-sectional view showing a thermosetting sealant curing process according to the prior art.

Figure 3 is a perspective view showing a photocurable sealant curing process according to the prior art.

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

5A through 5C conceptually illustrate a part of a manufacturing process of a liquid crystal display according to the present invention;

6 is a view showing a transverse electric field type liquid crystal display device according to the present invention.

FIG. 7 is an enlarged view illustrating a second alignment process of the stepped portion K in the transverse electric field type liquid crystal display shown in FIG. 6.

FIG. 8 is an enlarged view illustrating a second alignment process of a stepped portion by arranging a position of a polarization irradiating device to a rear side in a transverse electric field type liquid crystal display device according to the present invention; FIG.

<Description of Signs of Major Parts of Drawings>

100: lower substrate 101: alignment film

103: sealant 110: upper substrate

130: polarized light irradiation device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device (LCD), and more particularly, to a liquid crystal display device and a method of manufacturing the same, which improve the characteristics of the alignment layer and simplify the process.

Recently, research on flat panel displays has been actively conducted. Among them, the liquid crystal display device has a disadvantage of CRT (cathode ray tube) due to its high contrast ratio, suitable for gradation display or moving image display, and low power consumption. As an alternative means of overcoming, its use is gradually expanding.

The liquid crystal display device is composed of an upper substrate called a color filter substrate, a lower substrate called a thin film array substrate, and a liquid crystal layer formed between the upper and lower substrates facing each other. The two substrates are fully bonded by forming and curing a sealing agent that acts.

The sealant includes a thermosetting sealant and a photocurable sealant.

Among them, the thermosetting sealant is cured by heat, and has the advantages of high mechanical strength, adhesive strength, and high degree of crosslinking even at a relatively high temperature.

On the other hand, the photocurable sealant is cured by light, in particular, UV, it is possible to cure at low temperatures, the curing time is shortened, and there is less concern about thermal expansion when applied to the opposite substrate has the advantage that the degree of adhesion is improved. Therefore, the use of photocurable sealants continues to increase, especially in large display displays.

Hereinafter, a method of manufacturing a liquid crystal display device according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram illustrating a method of manufacturing a liquid crystal display device according to the prior art, Figure 2 is a cross-sectional view showing a thermosetting sealant curing process according to the prior art, Figure 3 is a photocurable sealant curing according to the prior art It is a perspective view which shows a process.

Referring to FIG. 1, a method of manufacturing a conventional liquid crystal display device is described. First, a black matrix for preventing light leakage, a color filter layer of RGB for expressing color, and a common electrode serving as a transparent conductive film are formed on an upper substrate. A gate line and a data line are defined on the lower substrate to vertically cross the pixel, a thin film transistor at an intersection point of the two lines, and a pixel electrode electrically connected to the thin film transistor (S10).

In this case, the thin film transistor is formed by stacking a gate electrode, a semiconductor layer, and a source / drain electrode.

Next, an alignment layer is selectively formed on upper and lower substrate inner surfaces on which various patterns are formed, and an alignment process is performed using a rubbing method to determine initial alignment of liquid crystal molecules to be subsequently formed (S20).

Further, the spacers are evenly sprayed on the upper substrate so that the upper and lower substrates are uniformly spaced apart, and a sealant is printed on the edges of the lower substrate so that the two substrates are opposed to each other (S30, S40). ).

At this time, be careful not to print the sealant in the active area, and do not form the sealant in the liquid crystal inlet so that the liquid crystal can be injected in the future.

Next, after the sealant is cured, the two bonded substrates are completely adhered to each other, the liquid crystal is injected between the two substrates through the liquid crystal inlet, and the liquid crystal inlet is sealed so that the liquid crystal does not flow out (S50). , S60).

Hereinafter, the sealant curing process will be described in detail.

First, when the thermosetting sealant is used as the sealant, as illustrated in FIG. 2, a hot plate (on the upper substrate 31 of the upper and lower substrates 31 and 32 that are uniformly spaced apart and bonded by the spacer 34) 35), the substrate is pressurized at a pressure of about 0.5 kg / cm &lt; 2 &gt; and uniformly compressed from the height of the original thermosetting sealant 33 to the height of the spacer to obtain a desired cell gap. Next, a temperature is applied to the hot plate 35 to cure the sealant.

At this time, the pressing step and the heating step may be performed at the same time.

However, the thermosetting sealant is hard to apply to a large-area substrate due to a long curing time, and there is a fear of thermal expansion, and has been replaced by a photocurable sealant having many advantages.

In the case of using the photocurable sealant as the sealant, as shown in FIG. 3, a mask 25 is covered on the opposing bonded upper and lower substrates 31 and 32 to mask the active region, and the mask 25 At the top is irradiated with UV provided from the light source 29.

That is, the light is irradiated only to the portions excluding the active region so that the photocuring seal agent 23 formed outside the active region is cured to completely adhere the upper and lower substrates 31 and 32.

At this time, since the alignment film 24 having low light resistance is formed in the active region, care should be taken not to irradiate light into the active region. This is because when the light is irradiated onto the alignment film having a predetermined tilt angle, the degree of orientation is affected and the orientation force is reduced.

However, the sealing agent 25 is coated on the opposing bonded upper and lower substrates 31 and 32 so that an active region is masked, and the sealing agent irradiates UV provided from the light source 29 on the mask 25. Since the hardening method requires an additional mask and a process of masking and aligning the mask on the upper and lower substrates 31 and 32, the process may be complicated and increase the defective rate.

In the upper and lower substrates 31 and 32, portions where the sealant 23 is formed are partially irradiated with UVs by the mask 25 in the active region. Most of the UV except the irradiated UV is blocked and there is a problem that the UV use efficiency is lowered.

Meanwhile, in the above-described step, in the step of selectively forming the alignment film on the inner surface of the upper and lower substrates 31 and 32 and performing the alignment process using the rubbing method, the initial alignment direction of the conventional liquid crystal molecules is determined by the rubbing method. Hereinafter, a process of forming an alignment film for explaining in more detail is as follows.

First, the alignment film is formed by applying a polymer thin film and arranging the alignment film in a predetermined direction.

In general, a polyimide-based organic material is mainly used for the alignment layer, and a rubbing method is mainly used to arrange the alignment layer.

In such a rubbing method, a polyimide-based organic material is first applied onto a substrate, the solvent is blown and aligned at a temperature of about 60 to 80 ° C., and then cured at a temperature of about 80 to 200 ° C. to form a polyimide alignment layer. It is a method of forming the orientation direction by rubbing the alignment layer in a predetermined direction using a rubbing cloth wound with a velvet or the like.

Such a rubbing method has an advantage in that the alignment treatment is easy, suitable for mass production, and stable orientation.

However, in the rubbing method, when using a roller having a defective rubbing cloth attached to the rubbing process, a rubbing defect occurs.

That is, since the rubbing method using the rubbing cloth is performed through the direct contact between the alignment film and the rubbing cloth, the destruction of the TFT element previously installed on the substrate due to contamination of the liquid crystal cell due to particle generation and generation of static electricity. In addition, various problems such as the need for an additional cleaning process after rubbing and non-uniformity of the orientation in large-area applications may occur, which may lower the yield in manufacturing the liquid crystal display.

According to the present invention, an alignment layer subjected to a rubbing treatment is formed in a liquid crystal display, and a sealant is applied to the opposingly bonded upper and lower substrates, thereby irradiating polarized UV to harden the sealant and simultaneously light the rubbed alignment layer. It is an object of the present invention to provide a liquid crystal display device and a method of manufacturing the same, which are capable of improving the image quality quality by having an alignment film property with good alignment.

In order to achieve the above object, a liquid crystal display device according to the present invention, the first substrate and the second substrate; A thin film transistor formed on the first substrate; A sealant formed on outer portions of the first substrate and the second substrate; And first and second alignment layers formed on the first substrate and the second substrate by primary alignment treatment, respectively, and the secondary alignment treatment is performed at the same time.

The first substrate includes: a gate wiring and a data wiring crossing each other longitudinally and horizontally to define a pixel region; A thin film transistor formed at an intersection of the gate wiring and the data wiring; A pixel electrode and a common electrode which are alternately spaced apart from each other in the pixel region; And an alignment layer formed on the pixel electrode and the common electrode.

The primary alignment treatment is characterized by consisting of a rubbing method.

The secondary alignment treatment is characterized in that made by polarized UV.

The sealant is characterized in that the first and second alignment layers are photo-cured at the same time as the secondary alignment treatment by polarized UV.

Forming an array element including a thin film transistor on a first substrate; Forming first and second alignment layers on the first substrate and the second substrate; Rubbing the first and second alignment layers; Forming a sealant on an outer portion of the first substrate or the second substrate; Bonding the first substrate and the second substrate to each other; And irradiating polarized UV to the entire surface of the first substrate or the second substrate to cure the sealant and to photoalign the first and second alignment layers.

The rubbing direction and the polarization direction are characterized in that they are perpendicular to each other.

Forming a gate line and a common line on the first substrate by being spaced apart from each other by a predetermined distance in a horizontal direction; Forming a data line in a direction perpendicular to the gate line; Forming a plurality of common electrodes parallel to the data lines, and forming a pixel electrode crossing and crossing the common electrodes; The method may further include forming a first alignment layer on the first substrate including the pixel electrode.

Forming a color filter layer and a black matrix on the second substrate; Forming a second alignment layer on the second substrate; characterized in that it further comprises.

The polarizing UV is irradiated to the first substrate and the second substrate at the same time.

Polarized UV is irradiated to the first substrate and the second substrate at least once.

Hereinafter, a liquid crystal display and a manufacturing method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a flowchart illustrating a method of manufacturing a liquid crystal display according to the present invention, and FIGS. 5A to 5C are conceptual views illustrating a part of the manufacturing process of the liquid crystal display according to the present invention.

As shown in FIG. 4, TFTs and color filter layers, which are driving elements, are formed on the lower substrate (TFT array substrate) and the upper substrate (color filter substrate) through the TFT array process and the color filter process (S201 and S202).

Here, the lower substrate may include a plurality of gate lines arranged in one direction at a predetermined interval, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines, and the gate lines and the data lines. A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing and a plurality of thin film transistors that are switched by signals of the gate line and transfer the signal of the data line to each pixel electrode are formed.

In the upper substrate, a black matrix layer for blocking light in portions other than the pixel region, R, G, and B color filter layers for expressing color colors and a common electrode for implementing an image are formed.

Meanwhile, the liquid crystal display device manufactured according to the present invention may include a liquid crystal display device in a twisted nematic (TN) mode and a vertical alignment (VA) mode in which a common electric field is formed on an upper substrate. It may be formed in the lower portion, for example, there is an IPS (in plane switching) mode, a fringe field switching (FFS) mode liquid crystal display device, and can be applied to the liquid crystal display device of various modes.

In addition, although the process of manufacturing the upper substrate is referred to as a color filter process, the color filter layer or the black matrix process may be performed together with the TFT array process of the lower substrate, depending on the type of liquid crystal display and the process thereof.

The TFT array process and the color filter process are carried out collectively on a large-area glass substrate on which a plurality of panel regions are formed.

First, a plurality of gate lines and data lines which are arranged on a lower substrate to define a pixel region by a TFT array process are formed, and are connected to the gate line and the data line in each of the pixel regions. A thin film transistor which is a driving element is formed.

In addition, a pixel electrode is connected to the thin film transistor through the TFT array process and drives a liquid crystal layer as a signal is applied through the thin film transistor.

In addition, the upper substrate is formed with a color filter layer of red, green, blue (R, G, B) to implement the color by the color filter process.

Subsequently, as shown in FIG. 5A, after the alignment layer 101 is applied to the lower substrate 100 on which the TFT is formed and the upper substrate 110 on which the color filter layer is formed (S203), the first alignment is performed using a rubbing method. The process is executed (S204).

 A polyimide resin having excellent heat resistance and affinity with liquid crystals on the entire upper and lower substrates 100 and 110 is printed and dried on a substrate to form an alignment layer 101, and a primary alignment treatment using a rubbing process. The initial orientation of the liquid crystal molecules is determined by

The primary alignment treatment is performed by aligning the alignment layer 101 in a predetermined direction using a rubbing cloth 120 wound with velvet, rayon, nylon, or the like on the first alignment layer 381 made of polyimide. It is a rubbing method which forms an orientation direction by rubbing.

As shown in FIG. 5B, a sealant 103 is printed in an outer region of the liquid crystal panel of the lower substrate 100 or the upper substrate 110 so that the liquid crystal injection hole for injecting the liquid crystal is opened ( S205).

The upper and lower substrates 100 and 110 are opposed to each other (S206).

Next, the sealant 103 is irradiated with UV on the front surface of the upper and lower substrates 100 and 110 that are printed and bonded to the outer region (S207).

In this case, the sealant 103 is photocured by the UV to completely adhere the upper and lower substrates.

At the same time, as shown in FIG. 5C, the UV is also irradiated to the active regions of the upper and lower substrates 100 and 110 to perform secondary alignment treatment on the alignment layer subjected to the primary alignment treatment by rubbing by photo alignment.

The UV used in the secondary alignment treatment is to use polarized UV by the polarization irradiation device 130, the polarized UV can be subjected to the orientation treatment as the polarized UV in the portion of the rubbing less during the primary alignment treatment.

Thereafter, after completely bonding the two substrates, the liquid crystal is injected between the two substrates through the liquid crystal inlet, and the liquid crystal inlet is encapsulated so that the liquid crystal does not flow out (S208).

Meanwhile, a liquid crystal panel may be manufactured by using a liquid crystal dropping method instead of a liquid crystal injection method as described above. The liquid crystal is dropped into the liquid crystal panel region of the lower substrate (S209), and the upper and lower substrates are bonded to each other (S210). The UV light is irradiated onto the entire surface of the lower substrate (S211).

In this case, the sealant 103 is photocured by the UV to completely adhere the upper and lower substrates 100 and 110.

At the same time, the UV is also irradiated to the active regions of the upper and lower substrates to perform the secondary alignment treatment of the alignment film subjected to the primary alignment treatment by rubbing by the optical alignment method.

Through this process, a plurality of liquid crystal panels having a liquid crystal layer are formed on glass substrates (lower substrates and upper substrates) having a large area. The glass substrates are processed and cut and separated into a plurality of liquid crystal panels. By inspecting, a liquid crystal display device is manufactured.

As such, after the alignment layers formed on the upper and lower substrates are bonded together, the sealant may be cured by irradiating polarized UV on the entire surface of the liquid crystal panel using the polarization irradiator using the polarization irradiator. By photoalignment using polarized UV, the chain structure of the alignment material that is not aligned may be broken to form an alignment layer having good alignment characteristics.

And it can also irradiate to the upper substrate of a liquid crystal panel using the said polarization irradiation apparatus, and can irradiate to the lower substrate of a liquid crystal panel.

In particular, in the transverse electric field type liquid crystal display device in which the common electrode and the pixel electrode are formed on one of the upper and lower substrates, the common electrode, the pixel electrode, the gate wiring, and the data wiring are formed in a stripe or zigzag pattern. Since the alignment treatment by rubbing in the stepped portion may be particularly insufficient, the primary and secondary alignment treatment methods according to the present invention are more effective.

6 illustrates a transverse electric field type liquid crystal display device according to an exemplary embodiment of the present invention.

As shown in FIG. 6, a low resistivity metal having a low resistivity is deposited on the array substrate 210 and then patterned by photolithography to form a gate wiring and the gate wiring. A gate electrode 214 of the thin film transistor branched at is formed.

As the low resistance metal, copper (Cu), aluminum (Al), aluminum alloy (AlNd), molybdenum (Mo), chromium (Cr), titanium (Ti), tantalum (Ta), molybdenum-tungsten (MoW), etc. Use

When the gate line and the gate electrode 214 are formed, a common line parallel to the gate line and a plurality of common electrodes 217 branched from the common line are simultaneously formed.

An inorganic insulating material such as silicon nitride (SiNx) or silicon oxide (SiOx) is deposited on the entire surface including the gate wiring by a plasma enhanced chemical vapor deposition (PECVD) method to form a gate insulating film 219.

Subsequently, a material such as amorphous silicon is deposited on the gate insulating layer 219 and selectively removed to form a semiconductor layer 227 in an island shape on the gate insulating layer 219 on the gate electrode 214.

In this case, an ohmic contact layer 227b in which impurity ions are implanted into the amorphous silicon layer 227a may be further formed and patterned.

Metals such as Cr, Al, Cu, Mo, Ti, Ta, MoW, and Al alloys are deposited on the entire surface of the gate insulating layer 219 and patterned by photolithography. A data line defining a region is formed, and source and drain electrodes 226 and 228 disposed at both ends of the semiconductor layer 227 are formed at the same time as the data line.

In addition, a silicon nitride film or BCB (benzocyclobutin), which is an organic insulating film, is coated on the entire surface of the array substrate 210 including the data line to form a protective film 238, and a contact hole (not shown) is formed in the drain electrode 228. ).

In addition, a transparent conductive layer is deposited and patterned on the entire surface using indium tin oxide (ITO) or indium zinc oxide (IZO), which is a transparent conductive material, and is connected to the drain electrode 228 and parallel to the data line. The plurality of pixel electrodes 230 may be formed to be disposed between the first and second electrodes 217 to alternate with the common electrode 217.

When the pixel electrode 230 is formed of a metal material, although not shown in the drawing, the pixel electrode 230 may be formed of the same material as the data line and the data line before forming the passivation layer 238.

An alignment layer material is formed on the entire surface including the pixel electrode 230. A polyimide resin having excellent heat resistance and affinity for liquid crystal is printed and dried on a substrate to form a first alignment layer 281 and a rubbing process. The primary alignment treatment is performed using.

In addition to the polyimide resin, polyamic acid, polyethyleneimine, polyvinyl alcohol, polyamide, polyamide, etc. Polyethylene, polystylene, polyphenylenephthalamide, polyester, polyurethanes, polymethylmethacrylate, and the like.

The first alignment treatment is performed by fixing the first alignment layer 281 using a rubbing cloth 233 wound with velvet, rayon, nylon, and the like on the first alignment layer 281 made of polyimide. It is a rubbing method which forms an orientation direction by rubbing in a direction.

On the other hand, reflectance such as chromium (Cr), chromium oxide (CrOx), or the like is prevented on the color filter substrate 270 to prevent light leakage from a portion where the liquid crystal cannot be controlled, that is, the gate wiring, the data wiring, and the thin film transistor portion. High metal or black resin is used to form the black matrix 273.

Thereafter, red (R), green (G), and blue (B) color filter layers 275 are formed between the black matrices 273 by using electrodeposition, pigment dispersion, and coating. Although not shown, an overcoat layer 279 may be formed on the entire surface including the color filter layer 275 to protect the color filter layer 275.

Next, a second alignment layer 282 is formed by printing a polyimide material having excellent affinity with liquid crystals and photosensitive characteristics on the overcoat layer 279 and forming the second alignment layer 281 as described above. As described above, the primary alignment treatment, which is a rubbing process, is performed.

Subsequently, after forming column spacers (not shown) on the array substrate 210 or the color filter substrate 270, the sealant 203 is formed at an edge of the array substrate 210 or the color filter 270 substrate. The liquid crystal panel is formed by bonding the array substrate 210 and the color filter substrate 270.

And the polarizing UV is irradiated to the whole surface on the array substrate 210 of a liquid crystal panel using a polarizing irradiation apparatus.

The sealant 203 is photocured by the polarized UV, and the first, second, and alignment layers 281 and 282 formed on the top layer of the array substrate 210 and the color filter substrate 270 are polarized by UV. Secondary alignment treatment is performed with photo-alignment.

At this time, the first and second alignment layers 281 and 282 are oriented by rubbing, and the chain of the unaligned portion is broken by the secondary alignment to form an alignment layer having good characteristics. For example, rubbing is not performed well in a portion where the stepped portion K occurs, such as an electrode portion and a wiring portion.

At this time, the polarization direction is preferably made in a direction perpendicular to the rubbing direction.

In particular, when the second alignment treatment such as polarized UV irradiation is applied to the first alignment film 281 subjected to the primary alignment treatment, the alignment is uniformly performed at the step portion K around the electrode portion.

FIG. 7 is an enlarged view illustrating a second alignment process of the stepped portion K in the transverse electric field type liquid crystal display shown in FIG. 6.

Referring to FIG. 7, a common electrode 217 is formed on an array substrate 210, and a gate insulating film 219, a protective film 238, and a first protective film 281 are formed on the common electrode 217. The pixel electrode 230 is formed.

A first alignment layer 281 subjected to primary alignment by rubbing is formed on the entire surface of the array substrate 210 on which the pixel electrode 230 and the common electrode 217 are formed.

A polarization irradiation apparatus is disposed on the color filter substrate 270 bonded to the array substrate 210 to irradiate polarized UV on the entire surface of the liquid crystal panel, and the polarized UV is transmitted through the color filter substrate 270 to thereby Irradiated onto the array substrate 210. In this case, the polarization UV cannot transmit to the black matrix 273 formed position of the color filter substrate 270.

In this case, the first alignment layer 281 is difficult to align the rubbing cloth because the rubbing cloth does not touch well, and the second alignment is performed by polarized UV irradiation made with the curing agent 203 in such a stepped portion. Since the treatment is performed, there is an effect that the orientation characteristics in the stepped portion (K) is improved.

On the other hand, since the polarization irradiation device is irradiated to the outer surface of the liquid crystal panel, the polarized UV light is transmitted through the array substrate 210 or the color filter substrate 270 made of a glass substrate to photo-align the alignment film formed inside the liquid crystal panel.

8 is a view showing an enlarged position of the second alignment process of the stepped portion by arranging the position of the polarization irradiating device to the rear side in the transverse electric field type liquid crystal display device according to the present invention.

Referring to FIG. 8, a common electrode 217 is formed on the array substrate 210, and a pixel is disposed on the gate insulating layer 219, the passivation layer 238, and the passivation layer 238 on the common electrode 217. The electrode 230 is formed.

A first alignment layer 281 subjected to primary alignment by rubbing is formed on the entire surface of the array substrate 210 on which the pixel electrode 230 and the common electrode 217 are formed.

Then, polarized UV is irradiated from the rear surface of the array substrate 210 using a polarization irradiation device.

Therefore, the polarized UV light transmitted through the glass substrate of the array substrate 210 is formed inside the liquid crystal panel through the remaining portions except for the metal portion, such as the common electrode 217, and is subjected to the first alignment process. The second alignment films 281 and 282 are subjected to secondary alignment.

The first alignment layer 281 is difficult to align the rubbing cloth at the stepped portion, so that the secondary alignment treatment is performed by polarized UV irradiation formed with the curing agent 203 at the stepped portion K. Since it is made, there is an effect that the orientation characteristics in the step portion is improved.

In particular, when the insulating film is formed on the upper portion of the common electrode 217 and the alignment film is applied thereon, the portion K having a step on the alignment film is spaced at a predetermined interval as the insulating film is stacked at the stepped portion of the common electrode. When the polarized UV is irradiated from the rear side, the common electrode may be irradiated with light to the alignment layer having the step even when the polarized UV is blocked.

The present invention not only cures the sealant by irradiating polarized UV to the front surface of the liquid crystal panel by using a polarization irradiation device, but also simultaneously performs secondary alignment treatment of the first and second alignment layers of the array substrate and the color filter substrate. Can be.

As described above, when the second alignment treatment such as light irradiation is applied to the first alignment film 281 subjected to the primary alignment treatment, the alignment is uniformly performed at the step portion K around the electrode portion.

As a result, the liquid crystal is injected and encapsulated in the liquid crystal panel by performing an additional secondary alignment treatment by partially irradiating light only on the stepped portion K around the electrode where the alignment is uneven by rubbing, which is a primary alignment treatment, in the alignment layer. When injected into the liquid crystal, since the liquid crystal is uniformly aligned within the liquid crystal panel, light leakage generated in the stepped portion K may be removed.

On the other hand, the present invention can not only photo-curing the sealant at the same time as the secondary alignment treatment to the alignment film by using a polarizing irradiation device in the liquid crystal panel, the polarizing irradiation device is irradiated with polarized light at least once or more on the front and back Hardening can also be advanced.

As described above, the liquid crystal display device and the manufacturing method thereof according to the present invention are not limited thereto, and it is apparent that modifications and improvements can be made by those skilled in the art within the technical idea of the present invention. Do.

The present invention improves the alignment characteristics by curing the sealant of the liquid crystal panel with polarized UV and UV-aligning the rubbed alignment film inside the liquid crystal panel by using a polarization irradiator, and uniformly aligns the liquid crystal to prevent light leakage and the image quality. Has the effect of improving.

In addition, the present invention can proceed with the photo-alignment process simultaneously with the curing of the sealant can reduce the process step and has the effect of improving the production yield.

Claims (12)

A first substrate and a second substrate; A thin film transistor formed on the first substrate; A sealant formed on outer portions of the first substrate and the second substrate; And first and second alignment layers formed on the first substrate and the second substrate by primary alignment treatment, respectively, and the secondary alignment treatment is performed at the same time. The method of claim 1, The first substrate, A gate wiring and a data wiring crossing each other longitudinally and horizontally to define a pixel region; A thin film transistor formed at an intersection of the gate wiring and the data wiring; A pixel electrode and a common electrode which are alternately spaced apart from each other in the pixel region; And an alignment layer formed on the pixel electrode and the common electrode. The method of claim 1, The alignment layer is made of polyimide, polyamic acid, polyethyleneimine, polyvinyl alcohol, polyamide, polyethylene, polystylene, polyphenylnephthala A liquid crystal display device, characterized in that the material selected from the group (polyphenylenephthalamide), polyester (polyester), polyurethane (polyurethanes), polymethylmethacrylate (polymethylmethacrylate). The method of claim 1, And the primary alignment treatment is a rubbing method. The method of claim 1, And the secondary alignment treatment is performed by polarized UV. The method of claim 1, The sealant is a liquid crystal display device, characterized in that the first and second alignment layers are photo-cured at the same time as the secondary alignment treatment by polarized UV. Forming an array element including a thin film transistor on a first substrate; Forming first and second alignment layers on the first substrate and the second substrate; Rubbing the first and second alignment layers; Forming a sealant on an outer portion of the first substrate or the second substrate; Bonding the first substrate and the second substrate to each other; And irradiating polarized UV on the entire surface of the first substrate or the second substrate to cure the sealant and photoalign the first alignment layer and the second alignment layer. The method of claim 7, wherein And the rubbing direction and the polarization direction are perpendicular to each other. The method of claim 7, wherein Forming a gate line and a common line on the first substrate by being spaced apart from each other by a predetermined distance in a horizontal direction; Forming a data line in a direction perpendicular to the gate line; Forming a plurality of common electrodes parallel to the data lines, and forming a pixel electrode crossing and crossing the common electrodes; And forming a first alignment layer on the first substrate including the pixel electrode. The method of claim 7, wherein Forming a color filter layer and a black matrix on the second substrate; And forming a second alignment layer on the second substrate. The method of claim 7, wherein And irradiating polarized UV light on the first substrate and the second substrate at the same time. The method of claim 7, wherein Polarizing UV is irradiated to the first substrate and the second substrate at least once or more.

Images