KR20070024234A - Liquid crystal display device and method for manufacturing the same - Google Patents

Abstract

A liquid crystal display device and a fabricating method thereof are provided to repair on-spots generated by conductive particles between upper and lower substrates by forming micro holes at corresponding positions and filling light shielding substances to bottoms of the micro holes, thereby improving visibility. A liquid crystal display device includes first and second substrates facing each other and defined with a plurality of pixel areas at corresponding portions, a plurality of pixel electrodes formed on the pixel areas of the first substrate with a distance from each other, and common electrodes formed on the entire surface of the second substrate. A liquid crystal layer is positioned between the substrates. Some of the pixel electrodes, on which conductive particles(51) remain, have pixel holes formed around the conductive particles by removing the pixel electrodes by a predetermined width. Micro holes(60) are defined on a rear surface of at least one(50) of the substrates at positions corresponding to the conductive particles, and have light shield substance layers(61) formed therein. The pixel electrodes, on which the conductive particles remain, are divided into transparent electrode patterns(56b) in the pixel electrode holes and pixel electrode patterns(57) outside the pixel electrode holes.

Description

Liquid crystal display device and method for manufacturing the same

1 is an exploded perspective view showing a general liquid crystal display device

2 is a plan view illustrating a case in which a conductive foreign substance occurs in a general liquid crystal display device.

3 is a cross-sectional view of FIG.

4 is a schematic cross-sectional view showing a bright point failing part and a normal driving part in an on state of the liquid crystal display of FIG. 2;

5A and 5B are plan views illustrating a liquid crystal display device in which a warm luminance defect is generated and a liquid crystal display device of the present invention, in which the same is repaired.

6A and 6B are a plan view and a cross-sectional view of the liquid crystal display of the present invention to which the repair process is applied, respectively.

7A to 7C are cross-sectional views illustrating a repair process applied to the liquid crystal display of the present invention.

8A to 8C are schematic cross-sectional views showing various shapes of a drill bit used when forming micro holes in a repair process.

9 is a cross-sectional view of a liquid crystal display device to which a repair process according to another exemplary embodiment of the present invention is applied.

* Description of symbols on the main parts of the drawings *

50: lower substrate 51: conductive foreign material

56 pixel electrode 56a transparent electrode pattern

57: pixel electrode hole 60: micro hole

61: black pigment layer 62: transparent pigment layer

70 upper substrate 71 black matrix layer

72 color filter layer 73 common electrode

75 liquid crystal layer 81 first polarizing plate

82: second polarizing plate 100: lower substrate

106 pixel electrode 106a transparent electrode pattern

107: pixel electrode hole 110: upper substrate

111 black matrix layer 112 color filter layer

113: common electrode 120: micro hole

121: black pigment layer 130: liquid crystal layer

141: first polarizing plate 142: second polarizing plate

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a method of manufacturing the same in order to reduce the effects of the conductive foreign material generated between the upper and lower substrates.

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELD), and vacuum fluorescent (VFD) Various flat panel display devices such as displays have been studied, and some of them are already used as display devices in various devices.

Among them, LCD is the most widely used as the substitute for CRT (Cathode Ray Tube) for mobile image display device because of its excellent image quality, light weight, thinness, and low power consumption. In addition to the use of the present invention has been developed in various ways such as a television and a computer monitor for receiving and displaying broadcast signals.

In order to use such a liquid crystal display as a general screen display device in various parts, it is a matter of how high quality images such as high definition, high brightness and large area can be realized while maintaining the characteristics of light weight, thinness and low power consumption. Can be.

Hereinafter, a liquid crystal display according to the related art will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing a general liquid crystal display.

As shown in FIG. 1, a liquid crystal display device includes a liquid crystal injected between a first substrate 1 and a second substrate 2 bonded to each other with a predetermined space, and between the first substrate 1 and the second substrate 2. It consists of layer (3).

In more detail, the first substrate 1 may have a plurality of gate lines 4 in one direction and constant in a direction perpendicular to the gate lines 4 at regular intervals to define the pixel region P. FIG. A plurality of data lines 5 are arranged at intervals. In addition, a pixel electrode 6 is formed in each pixel region P, and a thin film transistor T is formed at a portion where the gate line 4 and the data line 5 cross each other to form the gate line 4. A data signal of the data line 5 is applied to each of the pixel electrodes 6 according to a signal applied to the.

In addition, a black matrix layer 7 is formed on the second substrate 2 to block light in portions other than the pixel region P, and portions R corresponding to the respective pixel regions are formed to express colors. , G, B color filter layers 8 are formed, and a common electrode 9 for realizing an image is formed on the color filter layers 8.

In the liquid crystal display device as described above, the liquid crystal of the liquid crystal layer 3 formed between the first and second substrates 1 and 2 is aligned by an electric field between the pixel electrode 6 and the common electrode 9, The amount of light passing through the liquid crystal layer 3 may be adjusted according to the degree of alignment of the liquid crystal layer 3 to express an image.

Such a liquid crystal display is called a twisted nematic mode liquid crystal display, and in addition to the TN mode liquid crystal display, an in-plane switching (IPS) liquid crystal display using a horizontal electric field has been developed. In the transverse electric field (IPS) mode liquid crystal display, a pixel electrode and a common electrode are formed parallel to each other at a predetermined distance in a pixel area of the first substrate so that a transverse electric field (horizontal electric field) is generated between the pixel electrode and the common electrode. The liquid crystal layer is aligned by the lateral electric field.

In the following, the cause of the on-point being observed especially in the TN mode will be described.

FIG. 2 is a plan view illustrating a case where conductive foreign matter occurs in a general liquid crystal display, FIG. 3 is a cross-sectional view of FIG. 2, and FIG. 4 is a bright point defect and a normal driving unit in an on state of the liquid crystal display of FIG. 2. It is a schematic sectional drawing shown.

As shown in FIG. 2 to FIG. 4, the liquid crystal display of the TN mode has the first and second substrates 1 and 2 facing each other and the pixel regions of the first substrate 1 as described with reference to FIG. 1. The formed pixel electrode 6 and the common electrode 9 formed on the entire surface of the second substrate 2 are included. In addition, the black matrix layer 7 corresponds to the non-pixel region on the second substrate 2, and the color filter layer 8 corresponds to the pixel region.

When the conductive foreign material 21 remains on a predetermined portion of the pixel electrode 6 of the liquid crystal display of the TN mode formed as described above, the conductive foreign material 21 meets the common electrode 9 of the upper substrate 2. As a result, the pixel electrode 6 and the common electrode 9 on the first and second substrates 1 and 2 of the corresponding portions are electrically connected to each other. The conductive foreign material 21 may be particles remaining on the first substrate 1 or the second substrate 2 because residues remaining in the chamber after the process of etching the metal or the transparent electrode may not be removed even after cleaning. Conductive particles that fall from the periphery of the cell to the substrate during the cell process, and the conductive foreign material 21 is left in the area where the pixel electrode 6 is formed, especially when the common electrode 9 and the pixel above and below the pixel This causes a problem of conducting the electrode 6.

As shown in FIG. 4, the entire luminance point at which the conductive foreign material 21 remains to conduct the pixel electrode 6 and the common electrode 9 on the first and second substrates 1 and 2 to each other (the corresponding pixel electrode in which the conductive foreign material remains) When the defective portion and the normal driving portion are examined, since the pixel electrode 6 and the common electrode 9 are shorted, there is no potential difference between the two electrodes. Therefore, when the on-signal is applied to the pixel electrode 6 because the phase difference between the two electrodes is the same, conductive foreign material conducts the remaining pixel electrode 6 and the common electrode 9 thereon, and thus black. ), Light leaks from the entire pixel electrode 6 in which the conductive foreign material 21 remains. In this case, it is assumed that the liquid crystal display of the TN mode is a normally white mode. That is, the white state is displayed before the voltage is applied to the pixel electrode, and the black state is displayed when the voltage is applied. In this case, FIGS. 3 and 4 show that when the on signal is normally applied to the pixel electrode without a conductive foreign material, the light is normally blocked in a black state. Shorted with the upper common electrode 9, there is no potential difference between the pixel electrode 6 and the common electrode 9 in this region, and light is transmitted through this pixel, so that the entire pixel electrode 6 is seen as a bright spot. Indicates.

Meanwhile, even when the conductive foreign material 21 is located at a predetermined portion on the pixel electrode 6, the conductive foreign material 21 is formed in a single pattern that is not separated in each pixel area of the pixel electrode 6, so that the conductive foreign material 21 remains. Not only the entire pixel electrode 6 in the pixel region is short-circuited, but the entire pixel is observed with bright spots.

Although not described, in the case of the transverse electric field type or the VA mode, it is generally implemented in a normally black mode, and shows a black state under a condition where no voltage is applied and a white state under a condition where a voltage is applied. .

In the transverse electric field mode, even if conductive foreign material remains between the upper and lower substrates, the pixel electrode and the common electrode are formed to be alternately spaced apart from each other only on the lower substrate side, so that the upper and lower substrates may be shorted even under the condition of a white state where voltage is applied. In addition, even if the portion where the conductive foreign material remains is partially shorted with the adjacent electrode, this is a localized region, and the portion is shorted at an equipotential and appears as a partial weak point, which is harder to identify than the TN mode.

Also, in the VA mode, when the pixel electrode is formed on the lower substrate side and the common electrode is formed on the upper substrate side, and the driving is performed by the vertical electric field between the upper and lower substrates in the white state, the conductivity of the corresponding region is achieved. The foreign material may short the electrodes (a pixel electrode and a common electrode) on the upper and lower substrates of the pixel in which the conductive foreign material remains. In this case, the VA mode is a normally black mode, in which pixels with conductive foreign matter remain in an equipotential between the upper and lower substrates, and this portion always shows a black state regardless of whether an electric field is applied. As described above, in the VA mode of normally black mode, the pixel in which the conductive foreign material remains is observed as a dark spot.

In general, the user may feel that a bright spot on a dark background is much better than a dark spot on a part of the bright background. In this regard, among the various driving modes, when the TN mode liquid crystal display remains between the upper and lower substrates, the TN mode liquid crystal display device may be determined to be the severe implementation mode having the poorest point of brightness.

The conventional liquid crystal display as described above has the following problems.

In twisted nematic (TN) mode, when conductive foreign material remains between a predetermined pixel electrode formed on a lower substrate and a common electrode formed on an upper substrate, the pixel electrode and the common electrode are shorted due to the conductive foreign matter. Therefore, the pixel electrode part has the same voltage value between the common electrode and the pixel electrode, so that the corresponding pixel electrode in which the conductive foreign material remains in the on state (black state) under which voltage is applied is leaked in its entirety. This happens.

Unlike in the TN mode, in the transverse electric field (IPS) or VA (Vertical Allignment) mode, the foreign body is partially visible. In the TN mode, the conductive foreign material does not occupy a large part. When it remains on the pixel electrode, the entire pixel electrode is turned on so that the bright point can be easily observed, so that the problem of deterioration of visibility for the user is relatively large compared to other driving modes.

An object of the present invention is to provide a liquid crystal display and a method of manufacturing the same in order to reduce the effects caused by conductive foreign matter between the upper and lower substrates to solve the above problems.

In the liquid crystal display of the present invention for achieving the above object, a plurality of pixel regions are defined at portions corresponding to each other, and are spaced apart from each other on the first and second substrates facing each other and on the first substrate. A plurality of pixel electrodes formed in the pixel region, a common electrode formed on an entire surface of the second substrate, a liquid crystal layer formed between the first and second substrates, and a conductive remaining on a predetermined pixel electrode among the plurality of pixel electrodes A predetermined width is removed from the foreign material and the pixel electrode in the periphery of the conductive foreign material so as to correspond to a pixel electrode hole and a portion where the conductive foreign material is formed, and a predetermined thickness from a rear surface of at least one substrate back side of the first substrate and the second substrate layer. It is characterized in that it comprises a micro-hole removed and a light blocking material layer formed inside the micro-hole.

The pixel electrode in which the conductive foreign material remains is divided into a transparent electrode pattern inside the pixel electrode hole and a pixel electrode pattern outside the pixel electrode hole.

The semiconductor device may further include a gate line and a data line crossing each other on the first substrate to define the pixel area, and a thin film transistor formed at an intersection of the gate line and the data line.

The display device further includes a black matrix layer formed on the second substrate to correspond to an area excluding the pixel area, and a color filter layer formed to correspond to the pixel area.

The conductive foreign material is in contact with the common electrode.

The light blocking material layer is a black pigment.

The light blocking material layer is colored metal.

The light blocking material layer is formed at the bottom of the micro hole with a first thickness smaller than the predetermined thickness.

The transparent material is filled in the micro holes except for the light blocking material layer.

The transparent material is a transparent pigment.

First and second polarizing plates are attached to the rear surfaces of the first and second substrates, respectively.

In addition, in the method of manufacturing the liquid crystal display device of the present invention for achieving the same object, a plurality of pixel regions are defined in portions corresponding to each other, a first substrate having pixel electrodes formed in each of the pixel regions, and a common electrode formed on a front surface thereof. Preparing a liquid crystal panel in which a liquid crystal layer is formed between the formed second substrate and the first and second substrates; inspecting whether conductive foreign substances remain in the pixel electrodes in the liquid crystal panel; Detecting a predetermined pixel electrode to form a pixel electrode hole by removing a predetermined width of the periphery of the conductive foreign material among the corresponding pixel electrodes, and any one of the first substrate and the second substrate corresponding to the conductive foreign material Forming a microhole having a predetermined thickness on the back side of the substrate and filling the light blocking material into the microhole. It is characterized.

The light blocking material is formed at a first thickness smaller than the predetermined thickness from the bottom of the micro hole.

The method may further include filling the remaining portion of the micro hole with a transparent material.

The transparent material is a transparent pigment.

The micro holes are formed by removing a predetermined thickness of any one of the first and second substrates by using any one of a micro drill, a milling machine, an ultrasonic device, and a laser.

The pixel electrode hole is formed by irradiating a laser to a peripheral portion of the conductive foreign material from the back side of the first substrate by removing a predetermined width of the pixel electrode at the irradiation site.

The light blocking material layer is a black pigment.

The light blocking material layer is colored metal.

In addition, the manufacturing method of the liquid crystal display device of the present invention for achieving the same object is defined in a plurality of pixel areas in the areas corresponding to each other, the first substrate formed with a pixel electrode in each pixel area, and the common electrode on the front Preparing a liquid crystal panel in which a liquid crystal layer is formed between the formed second substrate and the first and second substrates, attaching a first polarizing plate to a rear surface of the first substrate, and attaching a second polarizing plate to a rear surface of the second substrate; And detecting a predetermined pixel electrode in which the conductive foreign material remains, forming a pixel electrode hole by removing a predetermined width around the conductive foreign material among the corresponding pixel electrodes, and remaining conductive foreign material in the pixel electrodes in the liquid crystal panel. Inspecting whether there is any one of the first substrate and the second substrate corresponding to the conductive foreign material, and a predetermined surface at a rear side of the polarizer attached thereto. Another feature is that it comprises the step of forming a micro hole of thickness and filling the light blocking material in the micro hole.

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.

5A and 5B are plan views illustrating a liquid crystal display device in which a warm light point defect is generated and a liquid crystal display device of the present invention, which repairs the same.

In the TN mode liquid crystal display device driven in the normally white mode, foreign matters generated during the array process (thin film transistor array forming process, color filter array forming process) or remaining in the air are not completely removed. When the conductive foreign material 51 is located on the predetermined pixel electrode 56, under the condition that a voltage is applied (indicated by a black state), the conductive foreign material 51 portion is formed on a common electrode (not shown). ), And when conduction occurs, as shown in FIG. 5A, not only the conductive foreign material 51 but the entire pixel electrode 56 appears bright.

In the liquid crystal display device to which the repair of the present invention, in which the conductive foreign material 51 is generated, is repaired, a peripheral portion of the conductive foreign material of the pixel electrode is drilled at a predetermined width using a laser to isolate the conductive foreign material area from the surroundings. After forming a micro hole in the back side of the substrate of the portion corresponding to the isolated conductive foreign material portion, and filled with a predetermined black pigment inside the micro hole, the bright foreign phenomenon caused by the conductive foreign material portion is shorted with the upper common electrode By blocking, as shown in FIG. 5B, all pixels are observed in a black state under a condition where a voltage is applied.

Hereinafter, the repair method applied to the liquid crystal display of the present invention will be described in detail.

6A and 6B are plan and cross-sectional views of a liquid crystal display of the present invention to which a repair process is applied, respectively, and FIGS. 7A to 7C are cross-sectional views illustrating a repair process applied to the liquid crystal display of the present invention.

6A and 7A, first, a lower substrate 50 on which a thin film transistor array process is completed and an upper substrate 70 on which a color filter array process is completed are prepared. In this case, the thin film transistor array process includes a gate line (not shown) and a data line (not shown) that cross each other on the lower substrate 50 to define a pixel area, and a pixel electrode formed to correspond to the pixel area. And a black matrix layer 71 formed on the upper substrate 70 to correspond to a region excluding the pixel region, and the pixel. This refers to the formation of a color filter array including a color filter layer 72 formed corresponding to an area and a common electrode 73 formed on the entire upper substrate 70.

On the other hand, a thin film transistor (not shown) is further formed at the intersection of the gate line and the data line on the lower substrate 50, and a gate insulating film (not shown) is further formed between the layers between the gate line and the data line. A passivation layer (not shown) is further formed between the data line and the pixel electrode 56.

Subsequently, after inverting the upper substrate 70 on which the color filter array is formed, the lower substrate 50 is opposed thereto, and then bonded to form the liquid crystal panel. In this case, the bonding is performed by forming a seal pattern (not shown) on the outer portions of the upper and lower substrates 70 and 50. Meanwhile, a liquid crystal layer 73 is formed in a layer between the upper and lower substrates 70 and 50 of the liquid crystal panel, and the liquid crystal layer 73 leaves a predetermined liquid crystal injection hole of a seal pattern and bonds the upper and lower substrates together. After the liquid crystal is injected into the liquid crystal injection hole, the liquid crystal is dropped into a predetermined portion of the lower substrate 50 before the upper substrate 70 is inverted, and then the upper and lower substrates 70 and 50 are bonded to each other. The liquid crystal is formed to fill the outer portion of the liquid crystal panel.

As described above, the liquid crystal display device of the present invention is proposed to solve the problem in which the conductive foreign material 51 remains in a predetermined portion of the formed liquid crystal panel, whereby the on luminance point occurs in the on state (black state) to which a voltage is applied. .

As described above, the formed liquid crystal panel is subjected to a step of inspecting whether conductive foreign substances remain in the pixel electrodes in the liquid crystal panel by applying a predetermined voltage. In this case, the liquid crystal panel is formed in a normally white mode, and when the voltage is applied, the liquid crystal panel should be in a black state. I think there is. As described above, after the inspection of the conductive foreign material 51, it is referred to as a series of post-curing point repair processes that cover the resulting bright spots, which will be described below.

As such, when the conductive foreign material 51 is generated, as shown in FIGS. 6A and 7A, the conductive foreign material 51 is formed by using a laser on the lower substrate 50 side so as to isolate the conductive foreign material 51 from the surroundings. A pixel electrode hole 57 of a predetermined width is drilled around the region. In this case, the hole 57 is formed by irradiating a laser to the back side of the lower substrate 50 on which the pixel electrode 56 is formed with energy enough to burn only the transparent electrode component. The pixel electrode 56 having the remaining 51 is divided into a transparent electrode pattern 56b having the conductive foreign material 51 remaining therefrom and a pixel electrode 56a spaced apart from the pixel electrode hole 57. Like the other pixel electrode 56, the pixel electrode 56a is normally applied with a pixel voltage signal under the condition that a voltage is applied, and the transparent electrode pattern 56b is formed in the upper part by interposing a conductive foreign material 51. Partially shorted with an electrode (not shown).

6B and 7B, the micro holes 60 are formed on the rear surface of the lower substrate 50 with a width that covers the transparent electrode pattern 56b. In this case, the width of the micro holes 60 is equal to or slightly larger than the width of the transparent electrode pattern 56b. This is because the transparent electrode pattern 56b is always shorted with the common electrode 73 under the influence of the conductive foreign material 51, and thus exhibits a white state.

The micro holes 60 are formed by drilling a predetermined depth from the rear surface of the lower substrate 50 using a micro drill, a milling machine, or a laser or an ultrasonic machine. . The micro holes 60 are formed to have a size sufficient to include the transparent electrode pattern 56b. In this case, when the shape of the micro holes 60 is used, the cross direction of the micro holes will be close to a circular shape after the micro drilling is performed in the direction in which the movement direction of the micro drills is vertical. In the case of using a milling machine, the movement direction of the milling can be up, down, left, and right, and the cross section shape of the hole can be arbitrarily designated. In addition, in the case of using a laser or an ultrasonic device, the thickness and shape will be determined according to the irradiation or projection area and intensity.

In this way, the micro holes 60 are formed from the rear surface of the lower substrate 50 to a predetermined thickness (so that the surface of the lower substrate is not exposed). For example, when the thickness of the lower substrate 50 is about 0.5 to 0.7 mm, the thickness of the micro holes 60 is about half or about the thickness of the lower substrate 50. For example, the thickness of the lower substrate 50 remaining on the micro hole 60 side may be about 0.05 to 0.2 mm. In this case, when the backlight unit (not shown) is positioned below the lower substrate 50, the micro holes 60 are formed by adjusting the thickness and width of the micro holes 60 in consideration of the amount of light exiting from the front side. do.

At this time, the micro holes 60 fill the bottom of the black pigment material to a first depth to cure the black pigment layer 61 to form a black pigment layer 61. The transparent pigment layer 62 is formed in the micro holes 60 except for the black pigment layer 61 by filling with a transparent pigment material. In this case, the thickness of the transparent pigment layer 62 corresponds to the value of the depth of the micro hole 60 minus the first depth. In this case, the light transmitted through the lower substrate 50 to the front of the transparent electrode pattern 56b and the pixel electrode 56a surrounding the conductive foreign material 51 remaining under the condition where the voltage is applied. Is blocked by the black pigment layer 61 at the bottom of the micro hole 60, and the remaining light that transmits the side surface is passed through the transparent pigment layer 62 in the micro hole 60. Through). Here, the black pigment layer 61 may be replaced with other materials of a material having a light-shielding property, for example, may be replaced with a light-shielding colored metal. In addition, the transparent pigment layer 62 may be replaced with other materials having transparency.

Here, when the black pigment layer 61 or the transparent pigment layer 62 is formed in the micro holes 60, a corresponding material (black pigment material or transparent pigment material) is applied to the micro holes 60 by using inkjet equipment. Proceeding by the direct dotting (dotting) method, or the tube that can be lowered to the inside of the micro hole in the micro hole 60 may be formed by using a long nozzle. In the latter case, the black pigment material causes the nozzle to correspond to the bottom of the micro holes 60, so that the black pigment material is formed only at the bottom, rather than on the sidewalls of the micro holes 60. Alternatively, the black pigment material may be formed by spraying the micro holes 60 through a spray (not shown). In this case, after the black pigment material is put into the spray inner container, the spray is sprayed on the back side of the substrate on which the micro holes 60 are formed. In this process, the spray is aligned with the micro holes 60 precisely. The black pigment material that is sprayed and left on the substrate is wiped or sucked away from the substrate surface leaving only the inside of the micro holes 60. Alternatively, although not shown, a method of forming the black pigment layer 61 in the micro holes 60 may include a vacuum cap (not shown) on the back surface of the substrate including the periphery of the micro holes 60 after leaving the black pigment material. It may be considered that the black pigment material is filled in the micro holes 60 by the pressure difference between the outside of the black pigment material and the inside of the micro holes 60.

In this case, after the black pigment layer 61 and the transparent pigment layer 62 are formed in the micro holes 60, when the conductive foreign material 51 is observed on the surface of the upper substrate 70, the black Under the influence of the pigment layer 61 will always be observed in a black state. As described above, the liquid crystal display of the present invention adopts a method of isolating the remaining portion of the conductive foreign material 51 from the surroundings, blocking them, and darkening the warm light point.

As illustrated in FIG. 7C, first and second polarizing plates 81 and 82 are formed on the rear surfaces of the upper and lower substrates 70 and 50 of the repaired liquid crystal panel.

On the other hand, in the above-described embodiment, as described above, the micro hole 60 may be formed on the back side of the lower substrate 50, or the upper substrate of the portion corresponding to the conductive foreign material 51 ( 70) may be formed on the back side.

8A to 8C are schematic cross-sectional views showing various shapes of a drill bit used when forming micro holes in a repair process.

8A to 8C illustrate a vertical cross section of a bit shape of a micro drill used when forming micro holes in the back side of the substrate on which the conductive foreign matter is generated in the repair process. In this case, in the case of FIG. 8A, the angle θ _{1 of the} bit 80a is within 180 °, and in the case of FIG. 8B, the angle of the bit 80b is 180 °, and FIG. In the case of 8c, it indicates that the angle θ ₂ of the bit 80c exceeds 180 °.

On the other hand, in the micro drilling, the drill bit is provided with the drill bit relative to the substrate surface, and inserted into and removed from the hole forming portion to be formed on the substrate to form a micro hole having a predetermined depth.

In the shape of such a bit, as shown in FIG. 8A, when the drill bit 80a is flat, the workability and the ejection of the glass chip are easy, but there is a possibility that a crack occurs at the beginning of the micro hole. It is large and requires a deeper drilling to ensure complete blocking even at a certain angle of view.

As shown in FIG. 8B, in the case of the flat drill bit 80b, even when the micro hole depth is small compared to the pointed drill bit (in the case of 8a) due to the flat bottom formation, it is advantageous for blocking. Due to its shape, the contact portion corresponding to the substrate is large, the drill bit is likely to be broken at the micro hole starting point, and the glass chip discharge is disadvantageous.

As shown in FIG. 8C, in the case of the reverse drill bit 80c, even if the micro hole depth is small compared to the pointed drill bit 80a due to the flat bottom, it is advantageous for blocking. Micro hole starting point cracks are less likely to occur. The degree of ejection of the glass chip is in the middle of the two bits above.

In this way, the shape of the drill bit can be changed and used according to the height and width to be formed of the micro hole 60. Among the various drill bit shapes, the reverse drill bit 80c is formed of the micro hole 60. It rises slightly convexly to the bottom center part, and it is more advantageous that the side light passing through the transparent pigment layer 62 passes, and the light can be blocked even when formed at a small depth. Advantages over the two drill bit shapes described above are that they are less likely to cause cracks during drilling.

In the micro drilling, when a predetermined width is formed, only one part moves up and down, and drills to a predetermined depth, and then moves to the periphery and drills to a predetermined depth by moving up and down again. The depth is set to a first depth of about 10 μm to 100 μm, horizontally moved within the width of the micro hole to be formed, and drilled to the first depth (10 μm to 100 μm deep), and within the micro hole width. After the removal of the first depth is completed, the operation of punching the first depth back to the first substrate is repeated to complete formation of the micro holes having a predetermined depth. Through this, it is possible to minimize the damage of the bit and stably form a micro hole of a predetermined shape using a micro drill.

9 is a cross-sectional view of a liquid crystal display device to which a repair process according to another exemplary embodiment of the present invention is applied.

As shown in FIG. 9, the liquid crystal display device having the repair process according to another exemplary embodiment of the present invention indicates that the repair process is performed after the formation of the polarizing plate.

That is, the liquid crystal display according to another exemplary embodiment of the present invention may include a lower substrate 100 and an upper substrate 110 formed to face each other, a liquid crystal layer 130 filled between the upper and lower substrates 110 and 100, The conductive foreign material 151 remaining on a predetermined portion of the upper portion of the pixel electrode 106 formed on the lower substrate 100, and the first polarizing plate 141 and the second polarizing plate 142 formed on the rear surfaces of the upper and lower substrates 110 and 100, respectively. It is made, including.

The lower substrate 100 may include a gate line (not shown) and a data line (not shown) that cross each other to define a pixel area, and a thin film transistor (not shown) formed at an intersection of the gate line and the data line. And a pixel electrode 106 formed in the pixel region.

In addition, the upper substrate 110 may include a black matrix layer 111 formed corresponding to an area excluding the pixel area, a color filter layer 112 formed corresponding to the pixel area, and an entire surface of the upper substrate 110. The common electrode 113 is included.

Here, the liquid crystal display according to another embodiment of the present invention, after forming the liquid crystal panel including the upper substrate 110 and the lower substrate 100 and the liquid crystal layer 130 filled therebetween facing each other When the conductive foreign matter remains in the liquid crystal panel by observing the bright point, and the conductive foreign material is observed accordingly, the pixel electrode 106 is removed by a predetermined width around the conductive foreign material 151 using a laser to remove the pixel. An electrode hole 107 is formed, and the conductive foreign material 151 is divided into a remaining transparent electrode pattern 106b and a peripheral pixel electrode 106a. The reason for forming the pixel electrode hole 107 before forming the polarizing plate is that the polarizing plate is formed when the laser beam is transmitted to the periphery of the conductive foreign material 151 on the rear surface of the lower substrate 100 or the upper substrate 110. When intervening, this is to prevent this because light may be distorted.

Subsequently, the first polarizing plate 141 and the second polarizing plate 142 are formed on the rear surfaces of the upper substrate 110 and the lower substrate 100, respectively, and then the repair process is performed.

This repair process is as follows.

A micro hole 120 having a predetermined depth is formed on a rear surface of the upper substrate 110 or the lower substrate 100 corresponding to the conductive foreign material 151, and the inside of the micro hole 120 has a light shielding property. The substance of, for example, black pigment and light-shielding colored metal is filled.

Here, the micro holes 120 together with the polarizing plate (the second polarizing plate 142 attached to the lower substrate 100 in the drawing shown) attached to the substrate by a method such as micro drilling a predetermined depth Removed to form. The formation of the micro holes 120 may be applied to all of the methods used for forming the micro holes. In this case, however, the inside of the microhole 120 is filled only with the light-shielding material 121. When the double layer of the black pigment / transparent pigment is filled in the microhole 120, the transparent pigment is filled. Since the side light that passes does not pass through the polarizing plate, the side light that does not pass through the polarizing plate may affect abnormal driving of the peripheral pixel electrode 106 in which the conductive foreign material 151 is generated.

In the liquid crystal display of the TN (twist nematic) mode among the various driving modes, the liquid crystal display of the present invention is the upper and lower parts in the on state when the conductive foreign material remains between the pixel electrode of the lower substrate and the common electrode of the upper substrate. The present invention is useful for solving the problem that the entire pixel electrode, in which conductive foreign matter remains, is observed as a bright point by energizing the common electrode and one pixel electrode on the substrate.

To this end, the pixel electrode of the portion where the conductive foreign material remains is isolated by using a laser to isolate the pixel electrode, thereby preventing the entire pixel electrode from being energized, and blocking the portion corresponding to the island image on the back side of the predetermined substrate side so as to brighten the site. To cover.

The liquid crystal display of the present invention as described above and a method of manufacturing the same have the following effects.

First, when a warm point occurs due to a conductive particle in the TN mode, the transparent electrode around the conductive particle is removed using a laser to make a partial bright point, and then only this part forms a micro hole. In the liquid crystal display device in which a light blocking material is filled in the bottom of the micro hole to perform a partial blocking of the partial bright point region, in particular, it is possible to prevent a poor light bright spot caused in the TN mode, thereby improving the user's eyesight. That is, only a portion of the corresponding pixel electrode in which the conductive foreign matter has been generated is spaced apart from the surroundings through the formation of the pixel electrode hole, so that the remaining pixel electrodes are normally applied with voltage, thereby enabling normal on / off driving. Only internal conductive foreign material is blocked, resulting in low luminance loss as a whole.

Second, by using an inverted drill bit when forming a micro hole, even when forming a micro hole with a small thickness, it is possible to block the front of the partial bright spot portion, and the micro hole bottom is convexly formed in the shape of the drill bit so that it is transparent. Side light passing through the pigment can be effectively transmitted, resulting in less light loss.

Third, repair may be possible even when the polarizer is attached to the liquid crystal panel.

Fourth, the defective panel which ultimately produces a bright point in a black state can be mass-produced by a repair process, and there exists an effect which can improve the liquid-crystal panel production yield.

Claims (25)

A plurality of pixel regions defined at portions corresponding to each other, the first substrate and the second substrate facing each other; A plurality of pixel electrodes spaced apart from each other on the first substrate and formed in the pixel area; A common electrode formed on an entire surface of the second substrate; A liquid crystal layer formed between the first and second substrates; A pixel electrode hole formed by removing a predetermined width of the pixel electrode around a foreign material remaining on a predetermined pixel electrode among the plurality of pixel electrodes; A microhole corresponding to a portion where the foreign material is formed, and defined to be removed to a predetermined thickness from a rear surface at a rear surface of at least one of the first substrate and the second substrate; And And a light blocking material layer formed inside the micro hole. The method of claim 1, The foreign material is a liquid crystal display, characterized in that the conductive. The method of claim 2, The conductive foreign material is in contact with the common electrode. The method of claim 1, The pixel electrode in which the foreign material remains is divided into a transparent electrode pattern inside the pixel electrode hole and a pixel electrode pattern outside the pixel electrode hole. The method of claim 1, On the first substrate A gate line and a data line crossing each other to define the pixel area; And And a thin film transistor formed at an intersection of the gate line and the data line. The method of claim 1, On the second substrate A black matrix layer formed corresponding to an area except the pixel area; And And a color filter layer formed corresponding to the pixel area. The method of claim 1, And the light blocking material layer is a black pigment. The method of claim 1, And the light blocking material layer is a colored metal. The method of claim 1, The light blocking material layer is formed to have a thickness smaller than the depth of the micro holes from the bottom of the micro holes. The method of claim 9, And a transparent material in the remaining micro holes except for the light blocking material layer. The method of claim 10, And the transparent material is a transparent pigment. The method of claim 1, And a first polarizing plate and a second polarizing plate, respectively, attached to the rear surfaces of the first and second substrates. A first substrate having pixel electrodes formed on each of the pixel regions, a second substrate having a common electrode formed on a front surface thereof, and a liquid crystal layer formed between the first and second substrates. Preparing a liquid crystal panel; Inspecting whether conductive foreign substances remain in the pixel electrodes in the liquid crystal panel; Detecting a predetermined pixel electrode in which the conductive foreign material remains, and forming a pixel electrode hole by removing a predetermined width around the conductive foreign material among the corresponding pixel electrodes; Forming micro holes having a predetermined thickness from a back side of one of the first and second substrates corresponding to the conductive foreign material; And And filling a light blocking material in the micro holes. The method of claim 13, And the light blocking material is formed to fill a thickness smaller than a depth of the micro hole from a bottom of the micro hole. The method of claim 14, And filling a transparent material into the remaining portion of the micro hole. The method of claim 15, And the transparent material is a transparent pigment. The method of claim 13, The micro holes are formed by removing any one of the first and second substrates by a predetermined thickness by using any one of a micro drill, a milling apparatus, an ultrasonic apparatus, and a laser. . The method of claim 13, And the pixel electrode hole is formed by removing a predetermined width of the pixel electrode on the irradiated portion by irradiating a laser to a peripheral portion of the conductive foreign material from the back side of the first substrate. The method of claim 13, And the light blocking material layer is a black pigment. The method of claim 13, And the light blocking material layer is a colored metal. The method of claim 13, The filling of the light blocking material into the micro holes may be performed by dotting the micro holes using ink jet equipment. The method of claim 13, The filling of the light blocking material into the micro holes is performed by using a long nozzle into which a tube enters the inside of the micro hole. The method of claim 13, The method of manufacturing a liquid crystal display device, wherein the filling of the light blocking material into the micro holes is performed by using a spray. The method of claim 13, Filling the light blocking material in the micro holes leaves the surface covering the micro hole inlet surface, and then covers the second substrate including the micro hole periphery with a vacuum cap to cover the light blocking material and the inside of the micro hole. The method of manufacturing a liquid crystal display device, wherein the light blocking material is filled in the micro holes by a pressure difference. A first substrate having pixel electrodes formed on each of the pixel regions, a second substrate having a common electrode formed on a front surface thereof, and a liquid crystal layer formed between the first and second substrates. Preparing a liquid crystal panel; Inspecting whether conductive foreign substances remain in the pixel electrodes in the liquid crystal panel; Detecting a predetermined pixel electrode in which the conductive foreign material remains, and forming a pixel electrode hole by removing a predetermined width around the conductive foreign material among the corresponding pixel electrodes; Attaching a polarizer to back surfaces of the first substrate and the second substrate; Forming micro holes having a predetermined thickness on one of the first substrate and the second substrate and a polarizer attached thereto corresponding to the conductive foreign material; And And filling a light blocking material in the micro holes.

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