KR102079455B1 - Methdo and apparatus for repairing birght pixels of liquid crystal display - Google Patents

Abstract

Provided is a repairing method of darkening a defective pixel by applying a laser beam to the defective pixel. Disclosed are a method for repairing a brightness defect of a liquid crystal display device, and an apparatus thereof, wherein the method comprises the following steps: irradiating a laser beam having a relatively low intensity to at least a part of a neighboring portion of the defective pixel; and irradiating a laser beam having a relatively high intensity to a central portion of the defective pixel. The method may further comprise a step of irradiating a laser beam to a part of a circuit of a lower substrate such as a power common electrode and a transparent electrode pattern in the pixel to more completely darken the defective pixel so that the circuit is disconnected or short-circuited to be changed. According to the present invention, a relatively low laser beam is irradiated to a neighboring portion of the defective pixel and thus, is possible to prevent an impact of irradiation of the laser beam from spreading therearound and adversely affecting a liquid crystal arrangement state of the adjacent pixels while the corresponding defective pixel is repaired.

Description

METHOD AND APPARATUS FOR REPAIR BALANCE OF LIQUID DISPLAY DEVICE {METHDO AND APPARATUS FOR REPAIRING BIRGHT PIXELS OF LIQUID CRYSTAL DISPLAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a technique for repairing bright spot defects of a liquid crystal display device, and more particularly, to repair bright spot defects that can blacken a corresponding pixel without adversely affecting adjacent pixels when the liquid crystal display device has a bright spot defect at a specific position. It relates to a method and an apparatus.

In general, an active matrix type liquid crystal display device changes an optical transmittance of a liquid crystal layer by changing a liquid crystal array by a voltage applied to each pixel to operate an optical switch, thereby realizing an image.

Referring to FIG. 1, the liquid crystal panel 500 is bonded so that a color filter substrate 530, which is an upper substrate, and a thin film transistor (TFT) array substrate 510, which is a lower substrate, are opposed to each other, and have dielectric anisotropy therebetween. The liquid crystal layer 520 is formed, and a thin film transistor (TFT) added to hundreds of thousands of pixels through a pixel selection address wiring is operated to apply a voltage to the pixel. do.

The color filter substrate 530 may include a glass 531, a color filter 532 such as RGB, a black matrix 533 formed between the color filters 532, an overcoat layer 534, and a common electrode. ITO (indium tin oxide) 535 and an alignment layer 536, the polarizer 537 is attached to the upper portion of the glass.

In order to manufacture such a liquid crystal panel, a thin film transistor array substrate process, a color filter substrate process, a liquid crystal cell process, and the like must be performed. The thin film transistor array substrate process is a process of forming a gate wiring, a data wiring, a thin film transistor, and a pixel electrode on a glass substrate by repeating deposition and photolithography processes on a lower substrate.

The color filter substrate process is a process of forming an ITO film for a common electrode after fabricating a color filter of RGB, which is arranged in a predetermined order on a substrate having a black matrix, usually an upper substrate, to realize color.

The liquid crystal cell process is a process of forming a liquid crystal layer by bonding a liquid crystal between the thin film transistor array substrate and the color filter array substrate so as to maintain a predetermined gap therebetween. Recently, an ODF (one drop filling) process is disclosed in which a liquid crystal is uniformly coated on a thin film transistor array substrate and then the color filter substrate is bonded.

In the inspection process of the liquid crystal display, a test pattern is displayed on the screen of the liquid crystal panel, and the presence or absence of a bad pixel is detected to correct a defect when a bad pixel is found. The defects of the liquid crystal panel can be roughly divided into point defects, line defects, and display unevenness. Point defects are caused by defective TFT elements, pixel electrodes, color filter wirings, and the like, and line defects are caused by disconnection between the wirings, shorts, breakdown of TFTs by static electricity, and poor connection with the driving circuit. The display unevenness may be caused by cell thickness unevenness, liquid crystal orientation unevenness, TFT characteristic place distribution, and time constant of a relatively large wiring.

Among them, point defects and line defects are generally caused by a defect in wiring, and when a wiring is open in the prior art, the disconnected portion is connected, and in the case of a short, the degree of disconnection of the wiring is short. It was only.

In addition to these defects, impurities including dust, organic materials, and metals are adsorbed in the manufacturing process of the liquid crystal panel. When such impurities are adsorbed near the color filter, the pixels emit much brighter light than the brightness of other normal pixels when the panel is driven. May cause symptoms.

As described above, when the driving failure of the switching occurs due to the abnormal patterning of the source and drain electrodes constituting the switching element, a hot pixel or a dead pixel may occur. Is more sensitive to the bright spots in the dark than the dark spots in the bright. Therefore, in determining the failure of the liquid crystal panel, a stricter criterion is given to the bright point defect than the dark point. Accordingly, a method for minimizing the panel failure rate due to bright spots is required. To this end, methods for converting the light point into a dark point have been proposed.

Laser repair is widely used to change the bright spot to dark spot. Fig. 2 is a conceptual diagram showing one embodiment in which a laser repair is performed on a processing target pixel for a dark ignition operation. As shown in Fig. 2, in the prior art, the entire pixel region including the pixel peripheral portion and the pixel central portion is all treated with a laser beam of the same intensity. The scanning direction SC0 of the laser beam is usually in a zigzag direction. In order to faithfully perform the darkening, it is required to irradiate not only the portion where the pixel electrode of the pixel to be processed is formed but also the peripheral portion where the black matrix is formed.

However, in the laser repair process, radicals are generated by a laser of strong energy, resulting in a chain reaction between the materials constituting the color filter layer and the liquid crystal layer in the display panel, and thus not only the corresponding pixel region but also adjacent pixels. Luminance may be reduced by reducing the voltage holding ratio (VHR) of the region.

FIG. 3 discloses a phenomenon in which an abnormality in the liquid crystal array is diffused in a form similar to a bubble in a neighboring pixel of the pixel to be processed (pixel, P0), which is similar to a black stain (BS). The enlarged drawing shows a case in which black spots are displayed as dots BS1 after laser repair processing on defective pixels.

In connection with the above-described liquid crystal display device abnormalities and repairs, Japanese Laid-Open Patent Publication No. 2006-72229 damages the alignment characteristics of liquid crystals by irradiating a laser with damage to the alignment layer, thereby lowering the transmittance of liquid crystals to reduce light leakage. It discloses a technique for removing.

As another repair method, Korean Patent Application No. 10-2006-86569 discloses a method of blackening defective pixels using a femtosecond laser.

Korean Patent No. 10-0879010 discloses a method of blackening a color organic material constituting a color filter layer of a liquid crystal display by a block shot method or a scan method with a laser beam having a specific wavelength.

Korean Patent No. 10-1226711 discloses a pixel configuration divided into two parts of an S-PVA mode liquid crystal display device, which is a kind of vertical alignment liquid crystal mode, and having a Vcom line and an ITO line pattern.

However, the above-described dark ignition processing technique of a defective pixel using a laser has a problem of adversely affecting the pixels around the defective pixel during the dark ignition process.

Accordingly, an object of the present invention is to provide a method for repairing a bright point defect of a liquid crystal display device which can prevent adverse effects on adjacent pixels in the process of repairing a defective pixel in connection with darkening repair of a defective pixel.

For example, the present invention can prevent or suppress a problem that is observed as a spot in a display device by causing a phenomenon in which an abnormality in a liquid crystal array state occurring in adjacent pixels of a pixel to be processed spreads in a bubble-like form. An object of the present invention is to provide a method and apparatus for repairing a bright point defect of a liquid crystal display device.

It is another object of the present invention to have advantages in preventing and preventing a problem particularly occurring in adjacent pixel liquid crystal alignment states in a vertical alignment mode liquid crystal display device such as patterned vertical alignment (PVA) or super PVA (S-PVA). The present invention provides a method and apparatus for repairing a bright point defect of a liquid crystal display device.

According to an aspect of the present invention for solving the above technical problem, a method for repairing a defect in brightness of a liquid crystal display device is a method for repairing a brightness defect in a liquid crystal display device for irradiating a dark spot by irradiating a defective pixel with a laser beam, corresponding to an edge of a defective pixel. Irradiating a peripheral portion with a laser light of a first light intensity to form a barrier rib in a hardened state, and irradiating a central portion of a defective pixel surrounded by the peripheral portion with a laser light of a second light intensity stronger than the first light intensity. And a second step of darkening.

In one embodiment, the first light intensity ranges from 30% to 80% of the second light intensity.

In one embodiment, the length of the peripheral portion in the width direction may be 10 to 15% of each length in the longitudinal direction and the width direction of the defective pixel at the outer boundary of the defective pixel.

In one embodiment, a method for repairing a bright point defect of a liquid crystal display device may include, before the first step, from a monitoring device coupled to a laser irradiation unit for supplying the laser light or from a storage device connected to the monitoring device. The method may further include obtaining information about a shape and determining a scan direction and an intensity of the laser light according to the obtained information.

In one embodiment, the method for repairing a bright point defect of a liquid crystal display device may be performed by welding a laser beam before the first step, before the second step, or after the second step to form a power line pattern inside the defective pixel. It may further comprise the step of blocking.

In one embodiment, the method for repairing a bright point defect of the liquid crystal display may further include, after the second step, reinforcing darkening of the periphery by second processing the periphery.

According to another aspect of the present invention for solving the above technical problem, a bright point repair apparatus for a liquid crystal display device is a liquid crystal display device for repairing a brightness defect in which a dark pixel is irradiated by irradiating a defective pixel with a laser beam, and the laser beam is irradiated. Irradiation unit; A work unit for placing or fixing a liquid crystal display; An actuator installed in at least one of the laser irradiation unit and the work unit to change the relative position of the laser light irradiated to the defective pixel of the liquid crystal display device; And a control unit for controlling the operation of the actuator and the operation of the laser irradiation unit, wherein the control unit irradiates a peripheral portion corresponding to the edge of the defective pixel with a laser light of a first light intensity, and surrounds the peripheral portion. The central portion of the defective pixel is irradiated with a laser light of a second light intensity stronger than the first light intensity.

In one embodiment, the first light intensity is in a range of 30% to 80% of the second light intensity, and the width direction length of the peripheral portion is in the length direction and the width direction of the bad pixel at an outer boundary of the bad pixel. Can reach 10-15% of each length.

In one embodiment, the point defect repair apparatus of the liquid crystal display device, before irradiating the laser light of the first light intensity, the defective pixel from the monitoring device coupled to the laser irradiation unit or from the storage device connected to the monitoring device Information about the internal shape may be obtained, and the scan direction and intensity of the laser light may be determined according to the information.

In one embodiment, the bright point repair device of the liquid crystal display, before irradiating the laser light of the first light intensity, before irradiating the laser light of the second light intensity, or the laser light of the second light intensity After irradiation, the power line pattern inside the defective pixel may be blocked by welding by laser light.

In one embodiment, the spot defect repair apparatus of the liquid crystal display device, after irradiating the laser light of the second intensity, by processing the peripheral portion with a laser beam of the third intensity less than the first intensity to improve the darkening of the peripheral portion Can be made to strengthen.

In one embodiment, the liquid crystal display is a liquid crystal display in which a liquid crystal in a vertical alignment mode (VA MODE) is disposed on a pixel.

According to the present invention, the influence of the laser light irradiation in the process of repairing the defective pixel by irradiating a relatively weak laser light to the peripheral region of the defective pixel is suppressed from adversely affecting the liquid crystal array state of the adjacent pixel. And can be prevented.

According to the present invention, in the vertical alignment mode liquid crystal display device such as a patterned vertical alignment (PVA) or a super PVA (S-PVA), the problem is easily spread to the adjacent pixels when the defective pixel laser is repaired. It is possible to effectively suppress and prevent the occurrence of problems in operation.

1 is a cross-sectional view showing the configuration of a conventional liquid crystal display device;
2 is a conceptual diagram showing a method of repairing defective pixels of a conventional liquid crystal display with a laser beam;
Figure 3 is a photograph for explaining the problem according to the repair method as shown in FIG.
4 is a flowchart illustrating a method for repairing a bright point defect of a liquid crystal display according to an exemplary embodiment of the present invention;
FIG. 5 is a conceptual diagram illustrating a mode in which a weak intensity laser beam is irradiated to a periphery of a defective pixel to be repaired of the liquid crystal display device according to the repair method of FIG.
6 is an exemplary view of a portion of a screen of a liquid crystal display including pixels darkened by the repair method of FIG.
7 is a view illustrating various forms of the scanning direction of the laser beam of the strong intensity of the repair method of FIG.
8 is a flowchart illustrating a method for repairing bright spot defects in a liquid crystal display according to another exemplary embodiment of the present invention;
9 and 10 are flowcharts illustrating a modification of the repair method of FIG. 8;
11 and 12 are exemplary views showing a state where welding is performed on Vcom and ITO lines of a defective pixel to be repaired in the repairing method of FIG. 8;
13 is a view for explaining a method for repairing a bright point defect of a liquid crystal display according to still another embodiment of the present invention;
14 is a block diagram of a bright spot repairing apparatus of a liquid crystal display according to another exemplary embodiment of the present invention.

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

4 is a flowchart illustrating a method for repairing a bright point defect of a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 5 is a conceptual diagram illustrating a mode in which a weak intensity laser beam is irradiated to a periphery of a defective pixel to be repaired of a liquid crystal display according to the repair method of FIG. 4, and a laser beam of high intensity is irradiated to a central portion of the defective pixel to be repaired. . 6 is an exemplary view of a portion of a screen of a liquid crystal display device including pixels darkened by the repair method of FIG. 4.

4 and 5, a method for repairing a bright point defect (hereinafter, simply referred to as a bright point resin method) of a liquid crystal display according to the present exemplary embodiment includes a peripheral region or a peripheral portion of the defective pixel 20 that needs repair first. 21) is irradiated with a laser beam (S41 in Fig. 4). Scanning of the laser beam SC1 at the periphery is performed either in a clockwise direction along the periphery of the pixel or in a fully closed curve in the counterclockwise direction as shown by the arrows in Fig. 5A, or two long sides and two short sides, respectively. Irradiation can be made in a variety of ways, such as irradiating the laser light only a part of the peripheral portion, for example, two long sides.

At this time, the laser output is smaller than, for example, 30 to 80% and more preferably 40 to 60%, than the repair laser beam output irradiated to the entire conventional pixel as shown in FIG. If the laser beam output is too small, dark flashing due to carbonization or denaturation of the color filter layer or the alignment layer may not be sufficient, and light leakage through the peripheral part may occur. On the contrary, if the output is too large and close to 100%, the color filter layer, alignment layer degeneration, and rupture of the adjacent pixels are already extended during the laser light irradiation to the peripheral portion, which may cause partial darkening of the adjacent pixels, which is an undesirable result. .

In the present embodiment, the widths w1 and w2 of the periphery are 5-20%, preferably 10-15%, of the total pixel width at the pixel boundary. In this case, if the peripheral widths w1 and w2 are too small, it is difficult to sufficiently block the influence of the adjacent pixels during the laser repair in the middle part. If the peripheral widths w1 and w2 are too large, the darkening is not enough in this part. This increases the chance of light leakage.

Through the weak laser beam irradiation on the peripheral portion, the polyimide layer or the like forming the alignment layer around the target pixel is cured to some extent, but severe damage such as rupture does not occur. Moreover, even in the adjacent pixel region close to the periphery, the periphery is processed by the weak laser light, so that the influence can be minimized when the processing is performed.

Next, as shown in FIG. 5B in a state in which a weak laser beam is irradiated to the pixel peripheral portion 21 as shown in FIG. 5A, an area or peripheral portion excluding the center portion 22, that is, the peripheral portion of the pixel, as shown in FIG. 5B. The laser beam is irradiated to the area surrounded by (S42 in FIG. 4). In this process, the color filter layer and the alignment film of the laser beam are irradiated with organic carbonization and denaturation, and the light transmittance is deteriorated. As the characteristics of the alignment film are changed, the liquid crystal arrangement of the processed part is also changed, so that light passes through the pixel. It turns into a darkening state that can't.

The scan SC2 of the laser beam at the center portion 22 of the pixel to be processed, that is, the defective pixel 20, may be performed in a zigzag form in the vertical direction. According to the bright point defect repairing method according to the present embodiment, as shown in FIG. 6, the repair processing can be performed without adversely affecting the peripheral pixels of the repaired pixel P2.

7 is a view illustrating various forms of the scanning direction of the laser beam of the strong intensity of the repair method of FIG.

Referring to FIGS. 7A to 7H, a scan SC of a laser beam of a pixel to be processed that may be employed in the method for repairing bright spot defects according to the present embodiment may be performed in various forms.

For example, in order to irradiate the laser beam throughout the pixel area, the laser beam may be oriented in the left and right width direction several times in the pixel in consideration of the shape and size of the laser beam in various ways as shown in FIG. The scan may be performed in the vertical direction, but may be implemented by moving the laser beam vertically or horizontally at a predetermined interval for each left or right or vertical scan.

Among these various scanning methods, laser beam irradiation can be performed by selecting the most effective method in consideration of the shape of the pixel and the internal structure of the pixel. The scan direction is generally left and right or up and down, but may be in a diagonal direction such as the ITO line shown in accordance with the rotation state of the liquid crystal display table.

In this case, the scan trajectory of the laser beam can be generated by the relative movement of the laser beam and the liquid crystal display device. More specifically, the angle adjustment and position of the optical element such as a light source irradiating the laser beam, a reflection mirror on the path, a beam splitter, and the like Adjustment can be made by adjusting the position on the xy plane of the table on which the liquid crystal display is placed. Since these specific control methods are already well known, a detailed description thereof will be omitted.

In this laser beam irradiation process, the intensity of the laser beam may be high, such that an alignment film or the like may be ruptured, and this rupture may be extended to the periphery as if the gold of the glass is extended to the periphery by the characteristics of the alignment film itself. Since the peripheral portion inside the pixel to be processed is already cured and the alignment film characteristics are different, the energy of the laser beam is blocked from expanding beyond the peripheral portion of the pixel when the central portion is processed.

As a result, darkening only occurs in the corresponding pixel, the alignment layer is maintained without rupturing in the surrounding pixels, and there is no change in the arrangement of liquid crystals of the surrounding pixels, and the luminance deterioration due to partial darkening in these surrounding pixels occurs. Will not occur.

8 is a flowchart illustrating a method for repairing bright spot defects in a liquid crystal display according to another exemplary embodiment of the present invention. 9 and 10 are flowcharts illustrating a modified example of the repair method of FIG. 8. 11 and 12 are exemplary diagrams showing a state where welding is performed on Vcom and ITO lines of a defective pixel to be repaired in the repairing method of FIG. 8.

Referring to FIG. 8, the spot defect repair apparatus (hereinafter simply spot defect repair apparatus) of the liquid crystal display apparatus implementing the method for repairing the fault point defect of the liquid crystal display device according to the present embodiment, first, according to the shape of the pixel in the laser scanning direction And intensity can be determined (S81).

Next, the bright spot repair apparatus may scan the edge portion of the laser processing region, that is, the peripheral portion corresponding to the edge with the laser beam of the first energy (S82).

Next, the bright spot repair apparatus may scan the inner portion of the laser processing region, that is, the central portion surrounded by the peripheral portion with a laser beam of a second energy larger than the first energy (S83).

Next, the bright spot repair apparatus may short-circuit the power electrode pattern inside the pixel included in the laser processing region through laser welding (S84).

On the other hand, as shown in Figure 9, the above short-circuit step (S84) may be carried out before the step (S83) of scanning the central portion with a laser beam.

In addition, as shown in FIG. 10, the short-circuit step S84 is performed before the step S82 of scanning the peripheral portion with the laser beam, or determining the laser scan direction and intensity according to the shape inside the pixel ( S81) may be performed before.

According to the present embodiment, the circuit portion of the lower substrate is irradiated with a laser beam having a higher intensity than the laser beam intensity in the scanning step of the peripheral portion or the center portion for the defective pixel, so that the circuit is disconnected from the corresponding portion or the upper layer circuit. As the organic material constituting the interlayer insulating film volatilizes and carbonizes at the overlapping portion of the lower layer circuit, the upper layer circuit and the lower layer circuit are short-circuited, which prevents the lighting voltage signal from being properly induced to the pixel, and the lighting signal is not supplied to the pixel. By preventing it from happening, the pixel darkening may be performed in a double or redundant manner.

For example, as shown in FIG. 11, in a liquid crystal display device having a pixel electrode 26 and a common electrode 27 on a TFT substrate and a liquid crystal 25 disposed therebetween, a pixel electrode (inside a defective pixel) 26 or the electrical connection of the common electrode 27 may be blocked through the laser welding 30.

As another example, as shown in FIG. 12, in the case of the S-PVA type liquid crystal display device, a welding region 32 connecting across a region dividing two sub-pixels 20a and 20b forming one pixel and The welding region 30 in the form of crossing the ITO pattern 24 displayed in the form of an oblique line is shown as an example.

That is, in the present embodiment, the pixel black is not driven by changing the defective pixel by laser welding the common power line Vcom line and the transparent electrode line ITO line to improve pixel blackening. By adding a step, the success rate of repair of the defective pixel may be greatly increased. Therein, the laser shot shape of the laser welding may be formed using the X-Y-θ slit.

According to the present exemplary embodiment, darkening is performed by the irradiation of the laser light in the defective pixel, and darkening is also achieved through circuit signal blocking, thereby stably completing the darkening process. At the same time, the periphery of the defective pixel is deformed through the initial low-intensity laser light irradiation, which acts as a space to prevent propagation of organic tears due to the next high-intensity laser light irradiation. Disturbance and a phenomenon that the luminance is lowered when the lighting signal is applied can be effectively prevented.

On the other hand, in the above embodiment, the peripheral portion of the target pixel is first irradiated with a laser beam of weak intensity, and the circuit blocking process of irradiating and cutting or welding the circuit portion with a strong laser beam is performed last. According to an example, there may be no circuit blocking process or may be performed first, or may be performed between a weak laser light irradiation step of a peripheral part and a strong laser light irradiation step of a center part.

13 is a view for explaining a method for repairing a bright point defect of a liquid crystal display according to another exemplary embodiment of the present invention.

In the method for repairing the bright point defect of the liquid crystal display according to the present embodiment, after processing the central portion 22 of the defective pixel 20 by darkening the laser beam, the light or darkening of the peripheral portion 21 is relatively improved. It can be implemented to further implement the peripheral darkening strengthening step to. FIG. 13A illustrates a pixel state before the peripheral darkening enhancement step, and FIG. 13B illustrates a pixel state after the peripheral darkening enhancement step.

The peripheral darkening enhancement step may include laser scanning the peripheral portion once again with a laser beam of a first intensity or less in the same or similar form as that of the peripheral portion. Laser beam scans to enhance periphery darkening can be performed quickly in a very short time with a first intensity, for example, 10 μs or less.

According to the present embodiment, the bright spot repair apparatus of the liquid crystal display apparatus scans the peripheral portion 21 once again using a laser beam having a third intensity less than or equal to the first intensity after darkening the central portion 22, that is, By dark-processing the peripheral part 21, darkening of the peripheral part 21 can be strengthened. This peripheral darkening enhancement process can be used to effectively deal with the very small light leakage at the peripheral portion seen in the processed defective pixels with a probability less than approximately 10% of the bright point repair process.

14 is a block diagram of a bright spot repairing apparatus of a liquid crystal display according to another exemplary embodiment of the present invention.

Referring to FIG. 14, the bright point repair apparatus 100 of the liquid crystal display according to the present embodiment includes a control unit 110 and a storage unit 120, and includes a laser irradiation unit 140 and a monitoring device 150. And an actuator 160. Bright spot defect repair apparatus 100, in a broad sense, may include a laser irradiation unit 140, the monitoring device 150 and the actuator 160.

The controller 110 executes a program stored in the storage 120. The controller 110 may be implemented as a central processing unit, a processor, or the like.

The storage unit 120 may store a program for implementing a method for repairing a bright point defect of the liquid crystal display. In addition, the storage unit 120 may store a program for controlling the operation of the bright point repair device of the liquid crystal display. The program may include a software module.

The software module includes a laser management module 121, an actuator control module 122, a laser beam intensity control module 123, an information acquisition module 124, a scan direction determination module 125, a welding processing module 126, and a peripheral portion reinforcement. It may include a processing module 127.

The laser management module 121 manages the operation of the laser irradiation unit for irradiating the laser light. The actuator control module 122 is installed in the work unit for mounting or fixing the liquid crystal display device or the laser irradiation unit, and operates to change or control the relative position of the laser light irradiated to the defective pixel of the liquid crystal display device. The laser beam intensity adjusting module 123 adjusts the intensity of the laser beam to a first intensity (first light intensity) when laser scanning a peripheral portion of the defective pixel, and adjusts the intensity of the laser beam when laser scanning a central portion of the defective pixel. Adjust to the second intensity (second light intensity) higher than the first intensity.

The information acquisition module 124 acquires information for determining the scan direction and intensity of the laser according to the state inside the pixel before the laser scan. The information acquiring module 124 is provided within the defective pixel from the monitoring device 150 coupled to the laser irradiation unit 140 or from a storage device (not shown or 120) for storing the collected information connected to the monitoring device 150. Information about the form can be obtained. The scan direction determining module 125 may compare the information acquired by the information acquisition module 124 with previously stored reference information to determine the scan direction and intensity of the laser beam for the corresponding defective pixel.

The welding processing module 126 blocks the power line pattern inside the bad pixel through welding by laser light. At least any one of the welding processing module 126 before irradiating the laser light of the first light intensity to the periphery of the defective pixel, before the laser light of the second light intensity, and after irradiating the laser light of the second light intensity It may be implemented to perform at least one welding process in one or more process.

The peripheral portion reinforcement processing module 127 laser-scans and brightens the central portion of the defective pixel, and then controls the operation of the laser scan of the peripheral portion using the laser beam having a third intensity less than or equal to the first intensity, thereby controlling the peripheral portion of the defective pixel. Enhances the darkening of the surroundings by enhancing the darkening of the darkening.

The laser irradiation unit 140 is provided to irradiate a laser beam to the liquid crystal display device disposed on the work unit. The laser irradiation unit 140 may include a laser generator, an optical system, and the like.

The monitoring device 150 is disposed around the work unit and installed to sense an internal state of a specific pixel of the liquid crystal display. The monitoring device 150 may include a lighting device, a camera device, and the like.

The actuator 160 may be installed in the work unit or the laser irradiation unit and controlled by the controller. The actuator 160 may include at least one device selected from a motor, a piston, a pump, a valve, a hydraulic device, and the like.

As described above, according to the present exemplary embodiment, the bright spot repair apparatus 100 may effectively darken the bright spot defective pixel of the liquid crystal display device, particularly, the liquid crystal display device having the liquid crystal in the vertical alignment mode (VA MODE). .

In the above described the present invention through a limited embodiment, but this is only illustrative for the purpose of understanding the present invention, the present invention is not limited to these specific embodiments. Accordingly, one of ordinary skill in the art to which the present invention pertains may implement various modifications or applications based on the present invention, and such modifications and applications belong to the appended claims.

Claims (15)

Claims [1] A method for repairing a bright point defect of a liquid crystal display device, wherein the defective pixel is irradiated with a laser beam to darken the light.
Irradiating a peripheral portion corresponding to an edge of the defective pixel with a laser beam of a first intensity to form the peripheral portion as a hardened partition wall; And
And a second step of irradiating a dark spot by irradiating a central portion of the defective pixel surrounded by the peripheral portion with a laser beam of a second intensity stronger than the first intensity.
No pixel drive by shorting the common power line (Vcom Line) and the transparent electrode line (ITO Line) inside the defective pixel before the first step, before the second step or after the second step by laser beam welding. And changing the state to improve the pixel darkening degree. The method of claim 1,
The first intensity is in the range of 30% to 80% of the second intensity bright point defect repair method of the liquid crystal display device. The method of claim 1,
The length of the peripheral portion in the width direction is 10 to 15% of the length of each of the length in the longitudinal direction and the width direction of the defective pixel at the outer boundary of the defective pixel defective repair method of the liquid crystal display device. The method of claim 1,
Before the first step, information on the internal shape of the defective pixel is obtained from a monitoring device coupled to the laser irradiation unit for supplying the laser beam or from a storage device connected to the monitoring device, and according to the obtained information, The method of claim 1, further comprising the step of determining the scan direction and the intensity of the light. delete delete The method of claim 1,
After the second step, further comprising the step of enhancing the darkening of the periphery by secondary processing the periphery through a laser scan of a laser beam having a third intensity less than the first intensity. How to repair the bright point of display device. The method of claim 1,
The liquid crystal display device comprises a liquid crystal in the vertical alignment mode (VA MODE) to the pixel, the bright point defect repair method of the liquid crystal display device. A liquid crystal display device for repairing defects in defects by irradiating dark pixels by irradiating defective pixels with a laser beam,
A laser irradiation unit for outputting a laser beam;
A work unit for placing or fixing a liquid crystal display device;
An actuator installed in at least one of the laser irradiation unit and the work unit to change the relative position of the laser beam irradiated to the defective pixel of the liquid crystal display device; And
It includes a control unit for controlling the operation of the actuator and the operation of the laser irradiation unit,
The laser irradiation unit irradiates a peripheral portion corresponding to the edge of the defective pixel with a laser beam of a first intensity, and irradiates a central portion of the defective pixel surrounded by the peripheral portion with a laser beam of a second intensity stronger than the first intensity. ,
Before irradiating the laser beam of the first intensity, before irradiating the laser beam of the second intensity, or after irradiating the laser beam of the second intensity, the inside of the defective pixel through welding processing by the laser beam A short-circuit repair apparatus for a liquid crystal display device, characterized by improving the pixel darkening degree by changing the pixel driving impossible state by shorting the common power line (Vcom Line) and the transparent electrode line (ITO Line). The method of claim 9,
And the first intensity ranges from 30% to 80% of the second intensity. The method of claim 9,
The length of the peripheral portion in the width direction is 10 to 15% of the length of each of the length in the longitudinal direction and the width direction of the defective pixel at the outer boundary of the defective pixel defective repair device of the liquid crystal display device. The method of claim 9,
Before irradiating the laser beam of the first intensity, the control unit obtains information on the internal shape of the defective pixel from a monitoring device coupled to the laser irradiation unit or from a storage device connected to the monitoring device and supplies the information to the information. According to claim 1, characterized in that the scanning direction and the intensity of the laser beam repair point defect repair apparatus of the liquid crystal display device. delete The method of claim 9,
After irradiating the laser light of the second intensity, the control unit laser-scans the peripheral portion through a laser beam having a third intensity less than the first intensity to enhance the dark ignition of the peripheral portion Device for repairing flaw defects. The method of claim 9,
And the liquid crystal display device is a liquid crystal display device in which a liquid crystal in a vertical alignment mode (VA MODE) is disposed on a pixel.

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