WO2020071572A1

WO2020071572A1 - Method and device for repairing bright spot defect of liquid crystal display device

Info

Publication number: WO2020071572A1
Application number: PCT/KR2018/012041
Authority: WO
Inventors: 노재호; 김왕유; 김학범
Original assignee: 주식회사 코윈디에스티
Priority date: 2018-10-05
Filing date: 2018-10-12
Publication date: 2020-04-09
Also published as: KR102079455B1; TW202015232A; TWI706559B

Abstract

In a repairing method of irradiating a defective pixel with a laser beam and darkening the defective pixel, disclosed are a method and a device for repairing brightness defect of a liquid crystal display device, comprising: a step of irradiating at least a portion of the peripheral portion of the defective pixel with a laser beam of relatively weak intensity; and a step of irradiating the central portion of the defective pixel with a laser beam of relatively strong intensity. In order to make darkening of the defective pixel clear, a step of irradiating a laser beam on a portion of a circuit of a lower substrate, for example, a power common electrode and a transparent electrode pattern inside a pixel and disconnecting or short-circuiting the circuit so as to change the circuit, may be further provided. According to the present invention, the peripheral portion of the defective pixel is irradiated with a relatively weak laser beam, and the influence of the laser beam irradiation in the process of repairing the defective pixel is diffused towards the surrounding area, thereby suppressing and preventing adverse effects on the liquid crystal arrangement state of adjacent pixels.

Description

Method and device for repairing defects in LCD display

The present invention relates to a technique for repairing defects in bright spots in a liquid crystal display device, and more specifically, in the case of a spot failure in a specific position in a liquid crystal display device, repairs a spot defect in which a corresponding pixel can be blackened without adversely affecting adjacent pixels. It relates to a method and apparatus.

In an active matrix type liquid crystal display device, an optical transmittance is changed by changing a light transmittance of a liquid crystal layer by changing a liquid crystal arrangement by a voltage applied for each pixel, thereby realizing an image.

Referring to FIG. 1, the liquid crystal panel 500 is bonded such that the color filter substrate 530 as an upper substrate and a thin film transistor (TFT) array substrate 510 as a lower substrate are opposed to each other, and have dielectric anisotropy between them. It is provided with a structure in which the liquid crystal layer 520 is formed, and is driven by switching a thin film transistor (TFT) added to hundreds of thousands of pixels through an address wiring for pixel selection to apply a voltage to the corresponding pixel. do.

Here, the color filter substrate 530 includes 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. It is made of an indium tin oxide (ITO) 535 and an alignment layer 536, and a polarizing plate 537 is attached to the top of the glass.

In order to manufacture such a liquid crystal panel, a thin film transistor array substrate process, a color filter substrate process, and a liquid crystal cell process 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 producing a color filter of RGB, which is arranged in a certain order on a substrate on which a black matrix is formed, usually an upper substrate.

The liquid crystal cell process is a process in which a liquid crystal layer is formed by injecting liquid crystal between the thin film transistor array substrate and the color filter array substrate to maintain a constant gap. Recently, an ODF (one drop filling) process in which a liquid crystal is uniformly applied to a thin film transistor array substrate and then bonded to a color filter substrate has been disclosed.

In the inspection process of the liquid crystal display device, a test pattern is displayed on the screen of the liquid crystal panel, and the presence or absence of defective pixels is detected and corrected for the defective pixels. The defects of the liquid crystal panel can be roughly divided into point defects, line defects, and display irregularities. Point defects are caused by defects in TFT elements, pixel electrodes, and color filter wiring, and line defects are caused by breaks in TFTs due to open wires, shorts, static electricity between the wires, and defective connection to the driving circuit. The display non-uniformity may be caused by non-uniformity of cell thickness, non-uniformity of liquid crystal orientation, dispersion of TFT characteristic locations, and time constant of relatively large wiring.

Of these, point defects and line defects are generally caused by defective wiring. When an open wire is conventionally found, the disconnected portion is connected, and in the case of a short, the wires are disconnected. It was just.

In addition to these defects, impurities including dust, organic matter, or metal are adsorbed in the process of manufacturing the liquid crystal panel. When these impurities are adsorbed in the vicinity of the color filter, when the panel is driven, the pixel emits light that is brighter than the brightness of other normal pixels. Can cause phenomena.

As described above, when a driving failure of switching occurs due to reasons such as patterning of the source and drain electrodes constituting the switching element is not normally performed, hot pixels or dead pixels may occur. Recognizes the bright spots in the dark state more sensitively than the dark spots in the bright state. Therefore, when determining the defect of the liquid crystal panel, a more strict criterion is given to the defect of the bright spot than the dark spot. Accordingly, a method for minimizing the panel defect rate due to bright spots is required. To this end, methods for converting a bright spot to a dark spot have been proposed.

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

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

FIG. 3 discloses a phenomenon in which an abnormality in liquid crystal arrangement in a pixel adjacent to a pixel to be processed (pixel, P0) diffuses in a form similar to a bubble and appears similar to black stain (BS). The enlarged drawing portion shows a case in which pixels having black spots are marked with dots BS1 after laser repair processing on a defective pixel.

In connection with the above-described abnormality and repair of the liquid crystal display device, Japanese Patent Application Publication No. 2006-72229 irradiates a laser to the alignment layer to damage the alignment characteristics of the liquid crystal, thereby reducing light transmittance by lowering the transmittance of the liquid crystal. It discloses a technique for removing.

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

Republic of Korea Patent Registration No. 10-0879010 discloses a method of blackening a block shot method or a scan method by using a laser beam having a specific wavelength of organic substances for each color constituting a color filter layer of a liquid crystal display device.

Korean Patent Registration No. 10-1226711 discloses a pixel configuration that is divided into two parts of an S-PVA mode liquid crystal display device, which is a type of vertically oriented liquid crystal mode, and has a Vcom line and an ITO line pattern.

However, in the above-described conventional dark ignition processing technology of a defective pixel using a laser, there is a problem that adversely affects pixels around the defective pixel in the dark ignition process.

Accordingly, an object of the present invention is to provide a method for repairing defective spots in a liquid crystal display device, which can prevent an adverse effect on adjacent pixels in the process of repairing defective pixels.

The present invention, for example, causes a phenomenon in which an abnormality of a liquid crystal arrangement state occurring in an adjacent pixel of a pixel to be processed spreads in a form similar to a bubble, thereby preventing or suppressing a problem observed as a stain in a display device. An object of the present invention is to provide a method and a device for repairing defects in a liquid crystal display device.

Another object of the present invention has the advantage of suppressing and preventing problems particularly well occurring in the liquid crystal arrangement of adjacent pixels in a vertical alignment mode liquid crystal display device such as patterned vertical alignment (PVA) or super PVA (S-PVA). It is to provide a method and apparatus for repairing defects in a liquid crystal display device.

A method for repairing defective spots in a liquid crystal display device according to an aspect of the present invention for solving the above technical problem is a method for repairing defective luminance in a liquid crystal display device that illuminates and darkens a defective pixel with laser light, corresponding to an edge of a defective pixel. The first step of forming a partition wall in a hardened state by irradiating the peripheral portion with the first light intensity laser light, and irradiating the central portion of the defective pixel surrounded by the peripheral part with a laser light having 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 reach 10 to 15% of each length in the length direction and the width direction of the defective pixel at an outer boundary of the defective pixel.

In one embodiment, a method for repairing defective spots in a liquid crystal display device may include, before the first step, from a monitoring device coupled to a laser irradiation unit that supplies 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 scanning direction and intensity of the laser light according to the obtained information.

In one embodiment, the method of repairing defective spots in a liquid crystal display device may include a power line pattern inside the defective pixel through welding by laser light before the first step, before the second step, or after the second step. It may further include the step of blocking.

In one embodiment, the method for repairing defective spots in a liquid crystal display device may further include, after the second step, secondary processing of the peripheral portion to enhance darkening of the peripheral portion.

In order to solve the above technical problem, the defective spot repair device of the liquid crystal display device according to another aspect of the present invention is a liquid crystal display device for repairing dark defects by irradiating defective pixels with laser light, and a laser that irradiates laser light. Irradiation unit; A work unit for placing or fixing a liquid crystal display device; An actuator installed in any one or more of the laser irradiation unit and the working unit to change a relative position of laser light irradiated to a defective pixel of the liquid crystal display; And a control unit that controls the operation of the actuator and the operation of the laser irradiation unit, and the control unit irradiates a peripheral portion corresponding to the edge of the defective pixel with laser light of a first light intensity and is surrounded by the peripheral portion. The central portion of the defective pixel is irradiated with laser light of a second light intensity stronger than the first light intensity.

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

In one embodiment, the defective spot repair device of the liquid crystal display device, before irradiating the laser light of the first light intensity, the defective pixel from a monitoring device coupled to the laser irradiation unit or from a storage device connected to the monitoring device It is possible to obtain information about the internal shape and determine the scanning direction and intensity of the laser light according to the information.

In one embodiment, the defect repair device of the liquid crystal display device, 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 irradiating, the power line pattern inside the defective pixel may be blocked through welding by laser light.

In one embodiment, after repairing the bright spot defect of the liquid crystal display device, after irradiating the laser beam of the second intensity, secondary processing of the peripheral area with a laser beam of the third intensity below the first intensity causes darkening of the peripheral area. It can be made to strengthen.

In one embodiment, 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 in a pixel.

According to the present invention, the influence of laser light irradiation in the process of repairing the defective pixel by irradiating relatively weak laser light to the peripheral area of the defective pixel is diffused to the periphery, thereby suppressing adverse effects on the liquid crystal arrangement state of the adjacent pixel. And prevent.

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

1 is a cross-sectional view showing the configuration of a conventional liquid crystal display,

Figure 2 is a conceptual diagram showing a method of repairing defective pixels (pixels) of a conventional liquid crystal display device with a laser beam,

Figure 3 is a picture for explaining the problem according to the repair method as in Figure 2,

4 is a flowchart illustrating a method for repairing defects in bright spots in a liquid crystal display device according to an exemplary embodiment of the present invention,

FIG. 5 is a conceptual diagram showing a form of irradiating a laser beam of weak intensity to a periphery of a defective pixel to be repaired in accordance with the repair method of FIG. 4 and irradiating a strong intensity laser light to a center of the defective pixel to be repaired;

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. 4.

7 is a view illustrating various forms of a scanning direction of a laser beam of a strong intensity among the repair method of FIG. 4,

8 is a flowchart of a method for repairing defects in bright spots of a liquid crystal display according to another embodiment of the present invention;

9 and 10 are flow charts for explaining a modification to the repair method of Figure 8,

11 and 12 are exemplary views showing a state in which welding is performed on Vcom and ITO lines of defective pixels to be repaired in the repair method of FIG. 8,

13 is a view for explaining a method of repairing a defect in a liquid crystal display according to another embodiment of the present invention;

14 is a block diagram of a defect repair device for a liquid crystal display according to another embodiment of the present invention.

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

4 is a flowchart illustrating a method for repairing defects in bright spots in a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 5 is a conceptual diagram showing a form of irradiating a weak intensity laser light to a periphery of a defective pixel to be repaired in accordance with the repair method of FIG. 4 and irradiating a strong intensity laser light to the center of the defective pixel to be repaired. . Also, 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. 4.

4 and 5, the method for repairing defective bright spots in the liquid crystal display according to the present embodiment (hereinafter, simply referred to as a bright spot defective resin method) includes: a peripheral region or a peripheral portion of the defective pixel 20 that needs repair. 21) is irradiated with a laser beam (S41 in FIG. 4). Scanning of the laser beam at the periphery (SC1) is carried out along the periphery of the pixel while making a completely closed curve in the clockwise direction or as shown by the arrow in FIG. 5 (a), or by performing two long sides and two short sides respectively. Irradiation, or a part of the periphery, for example, can be made in various ways, such as a method of irradiating laser light only on two sides.

At this time, the laser power is smaller than, for example, 30 to 80% of the laser beam output for repairing the conventional pixel as shown in FIG. 2, and more preferably 40 to 60%. When the laser beam output is too small, the dark ignition of the color filter layer or the alignment layer is insufficient, and light leakage through the peripheral portion may occur. On the contrary, if the output is too large and close to 100%, partial darkening of adjacent pixels, which is an undesired result, may occur due to the extension of color filter layer, alignment layer modification, and rupture of adjacent pixels in the process of laser light irradiation to the peripheral portion. .

In this embodiment, the widths w1 and w2 of the peripheral portion are 5 to 20% of the total pixel width at the pixel boundary, preferably 10 to 15%. At this time, if the peripheral widths w1 and w2 are too small, it is difficult to sufficiently block the influence of adjacent pixels during laser repair in the center, and if the peripheral widths w1 and w2 are too large, dark ignition may not be sufficiently achieved in this area. Through this, the possibility of light leakage increases.

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

Next, as shown in FIG. 5 (a), in the state in which a weak laser beam is irradiated to the pixel peripheral portion 21, as shown in FIG. 5 (b), the central portion 22 of the corresponding pixel, that is, an area or peripheral portion excluding the peripheral portion Laser beam irradiation is performed on the area enclosed by (S42 of FIG. 4). In this process, in the color filter layer, alignment layer, etc. of the part irradiated with laser light, organic material carbonization and degeneration occur, and light transmittance deteriorates, and as the characteristics of the alignment film change, the liquid crystal arrangement state of the processed part changes, so light passes through this pixel. It turns into a dark ignition state that cannot be done.

The scan SC2 of the laser beam in the central 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 method for repairing defective spots according to the present embodiment, repair processing can be performed without adversely affecting peripheral pixels of the repaired pixel P2 as shown in FIG. 6.

7 is a view illustrating various forms of a scanning direction of a laser beam having a strong intensity among the repair method of FIG. 4.

Referring to FIGS. 7A to 7H, a scan (SC) of a laser beam of a pixel to be processed, which can be employed in the method for repairing defective spots according to the present exemplary embodiment, may be performed in various forms.

For example, in order to irradiate the laser beam seamlessly over the entire pixel area, the laser beam is rotated in the left and right width directions within the pixel several times in consideration of the shape and size of the laser beam in various ways as illustrated in FIG. 7. The scan may be performed in the vertical direction, but may be implemented to move the laser beam up and down or left and right at regular intervals for each horizontal scan or vertical scan.

Among these various scanning methods, laser light irradiation may be performed by selecting the most effective method in consideration of the shape of the pixel and the structure inside the pixel. The scan direction is usually a left-right direction or a vertical direction, but may be made in a diagonal direction such as the ITO line shown according to the rotation state of the liquid crystal display table.

At this time, the scan trajectory of the laser beam can be created through the relative movement of the laser beam and the liquid crystal display, and more specifically, the angle and position of the optical element such as a light source irradiating the laser beam, a reflection mirror on the path, and a beam splitter. 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 adjustment methods are already well known, detailed description thereof will be omitted.

During the laser beam irradiation process, the intensity of the laser light is strong, so that rupture of the alignment layer or the like may occur, and such rupture may be extended to the periphery as if the gold of the glass extends to the periphery, due to the characteristics of the alignment layer itself. In, since the peripheral portion inside the pixel to be processed is already hardened and the alignment film characteristics are changed, when processing the central portion, the energy of the laser beam does not extend beyond the peripheral portion of the pixel and is blocked.

As a result, the dark ignition is performed only in the corresponding pixel, the alignment layer is maintained in the peripheral pixel without being ruptured, and there is no change in the arrangement of the liquid crystal of the peripheral pixel, and the luminance decrease due to partial dark ignition in these peripheral pixels. Will not occur.

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

Referring to FIG. 8, a defect repair device (hereinafter simply referred to as a repair device for defective spots) of a liquid crystal display device that implements a method for repairing a defect in a liquid crystal display device according to the present embodiment, first, is a laser scan direction according to a shape inside a pixel. And it is possible to determine the intensity (S81).

Next, the defective repair device may scan an edge portion of the laser processing region, that is, a peripheral portion corresponding to the edge with a laser beam of first energy (S82).

Next, the defect repair device may scan the inner portion of the laser processing region, that is, the center portion surrounded by the peripheral portion with a laser beam of a second energy greater than the first energy (S83).

Next, the defect 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 short-circuiting step (S84) may be performed before the step (S83) of scanning the central portion with a laser beam.

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

According to this embodiment, the circuit portion of the lower substrate is irradiated with a laser beam having a higher intensity than the intensity of the laser beam in the scan step of the peripheral portion or the center portion of the defective pixel, and the circuit is disconnected or the upper layer circuit As the organic material constituting the interlayer insulating film is volatilized and carbonized at the portion where the lower layer circuit overlaps, the upper layer circuit and the lower layer circuit are short-circuited, so that the lighting voltage signal is not properly induced in the corresponding pixel, and the lighting signal is not applied to this pixel, so that the lighting is turned on. It is possible to prevent pixel darkening in a double or redundant manner by preventing it from being achieved.

As an 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) Alternatively, the electrical connection of the common electrode 27 may be cut off through the laser welding 30.

As another example, as shown in FIG. 12, in the case of an S-PVA type liquid crystal display, a welding region 32 connecting across regions dividing two sub-pixels 20a and 20b making one pixel and , A welding region 30 having a shape traversing the ITO pattern 24 displayed in a diagonal shape is shown as an example.

That is, in the present embodiment, laser welding is performed on a common power line (Vcom Line) and a transparent electrode line (ITO Line) inside a pixel to change a defective pixel into a pixel driving impossible state, thereby improving the degree of pixel blackening. By adding a step, the success rate of repair processing of defective pixels can be greatly increased. There, the laser shot shape of the laser welding may be formed using X-Y-θ slit.

According to the present embodiment, in the defective pixel, dark ignition according to laser light irradiation is generally performed, and dark ignition is also performed through circuit signal blocking to stably complete the dark ignition processing. At the same time, the peripheral portion of the defective pixel is denatured through the initial low-intensity laser light irradiation, thereby acting as a barrier to prevent propagation to the periphery of the organic material rupture due to the next strong-intensity laser light irradiation, so that the liquid crystal array is arranged in the peripheral pixel. The phenomenon that the luminance is lowered when disturbed and the lighting signal is applied can be effectively prevented.

On the other hand, in the above embodiment, the first step is to irradiate the periphery of the target pixel with laser light of a weak intensity, and the circuit blocking process of cutting or welding the circuit part by irradiating with strong laser light is performed last, Depending on the example, the circuit blocking process may be absent or may be performed first, or may be performed between a weak laser light irradiation step in the periphery and a strong laser light irradiation step in the center portion.

13 is a view for explaining a defect repair method of a liquid crystal display device according to another embodiment of the present invention.

The method for repairing defects in bright spots in the liquid crystal display device according to the present embodiment improves the lightness or blurring of the peripheral portion 21 relatively lightly after darkening by processing the central portion 22 of the defective pixel 20 with a laser beam. It can be implemented to further perform the step of strengthening the peripheral dark ignition. 13 (a) illustrates the pixel state before the peripheral darkening enhancement step, and FIG. 13 (b) illustrates the pixel state after the peripheral darkening enhancement step.

The step of enhancing the darkening of the periphery may include once again scanning the periphery with a laser beam having a first intensity or less in the same or similar shape to the periphery. The laser beam scan for enhancing the peripheral darkening can be performed quickly in a very short time, such as 10 µs or less of the first intensity.

According to the present embodiment, the defect repair device of the liquid crystal display device darkens the central portion 22 and then scans the peripheral portion 21 once again using a laser beam having a third intensity of a first intensity or less, that is, The dark ignition of the peripheral portion 21 can be enhanced by secondary processing of the peripheral portion 21. This peripheral darkening enhancement process can be used to effectively treat a very small light leakage condition in the peripheral part seen in the processed defective pixel with a probability less than approximately 10% of the defect repair process.

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

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

The storage unit 120 may store a program that implements a method for repairing defects in a liquid crystal display device. In addition, the storage unit 120 may store a program for controlling the operation of the defect repair device of the liquid crystal display device. The program may include software modules.

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

The laser management module 121 manages the operation of the laser irradiation unit that irradiates laser light. The actuator control module 122 is installed in the work unit for placing 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 control module 123 adjusts the intensity of the laser beam to a first intensity (first light intensity) when laser scanning the periphery of the defective pixel, and adjusts the intensity of the laser beam when laser scanning the central portion of the defective pixel. Adjust to a second intensity (second light intensity) higher than the first intensity.

The information acquisition module 124 acquires information for determining the scanning direction and intensity of the laser according to the state inside the pixel before laser scanning. The information acquisition module 124 may be installed in a defective pixel from a monitoring device 150 coupled to the laser irradiation unit 140 or from a storage device (not shown or 120) connected to the monitoring device 150 to store the collected information. Information about the form can be obtained. The scan direction determination module 125 may compare information acquired by the information acquisition module 124 with pre-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 a power line pattern inside the defective pixel through welding by laser light. The welding processing module 126 may have at least any one of before, after irradiating the laser light of the first light intensity, before irradiating the laser light of the second light intensity, and after irradiating the laser light of the second light intensity to the periphery of the defective pixel. It may be implemented to perform at least one welding process in one or more process processes.

The peripheral enhancement module 127 controls the operation of laser scanning of the peripheral portion using a laser beam having a third intensity equal to or less than the first intensity after laser scanning and darkening the central portion of the defective pixel, thereby controlling the peripheral portion of the defective pixel. It improves the dark ignition state and strengthens the dark ignition of the surrounding area.

The laser irradiation unit 140 is provided to irradiate the laser beam to the liquid crystal display device disposed on the working 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 is installed to sense the internal state of a specific pixel of the liquid crystal display device. 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 laser irradiation unit and controlled by a control unit. The actuator 160 may include at least one or more devices selected from motors, pistons, pumps, valves, hydraulic devices, and the like.

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

In the above, the present invention has been described through limited embodiments, but the present invention is not limited to these specific embodiments, which are merely illustratively described to help understanding of the present invention. Accordingly, a person having ordinary knowledge in the field to which the present invention pertains may make various changes or application examples based on the present invention, and it is natural that such modifications and application examples belong to the appended claims.

Claims

In the method of repairing the defective luminance of the liquid crystal display device to darken by irradiating a defective pixel with a laser beam,

A first step of irradiating a peripheral portion corresponding to the edge of the defective pixel with a laser beam of a first intensity to form the peripheral portion as a partition wall in a hardened state; And

A second step of darkening 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;

Repair method of defects in the liquid crystal display device comprising a.
According to claim 1,

The first intensity is 30% to 80% of the second intensity, characterized in that the defect repair method of the liquid crystal display device.
According to claim 1,

The length of the peripheral portion in the width direction reaches 10 to 15% of the length of each of the defective pixels in the longitudinal direction and the width direction at the outer boundary of the defective pixel.
According to 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 that supplies the laser beam or from a storage device connected to the monitoring device, and a laser is used according to the obtained information. And determining the scanning direction and intensity of the light.
According to claim 1,

And before the first step, before the second step, or after the second step, blocking the power line pattern inside the defective pixel through welding by a laser beam. How to repair bad spots.
The method of claim 5,

The power line pattern is at least one of a region in which the common power (Vcom) electrode line and the transparent electrode in the defective pixel overlap the upper and lower layers.
According to claim 1,

And after the second step, further comprising the step of secondaryly processing the periphery of the laser beam through a laser scan of the laser beam having a third intensity equal to or less than the first intensity to enhance darkening of the periphery. How to repair defective display device.
The method according to any one of claims 1 to 7,

The liquid crystal display device, the vertical alignment mode (VA MODE) of the liquid crystal display, characterized in that the liquid crystal display device is provided with a defect.
A liquid crystal display device for illuminating 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 working unit to change a relative position of a laser beam irradiated to a defective pixel of the liquid crystal display; And

It includes a control unit for controlling the operation of the actuator and the operation of the laser irradiation unit,

The control 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. Repair device for defective bright spots of a liquid crystal display device, characterized in that.
The method of claim 9,

The first intensity is 30% to 80% of the second intensity range Defect repair device of the liquid crystal display device, characterized in that.
The method of claim 9,

The length of the peripheral portion in the width direction reaches 10 to 15% of each length in the length direction and the width direction of the defective pixel at an outer boundary of the defective pixel.
The method of claim 9,

Before irradiating the laser beam of the first intensity, the control device 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 the information Defect point repair device of a liquid crystal display device, characterized in that to determine the scanning direction and intensity of the laser beam according to.
The method of claim 9,

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 control device performs the defect through welding by the laser beam. A defect repair device for a liquid crystal display device, characterized in that the power line pattern inside the pixel is cut off.
The method of claim 9,

After irradiating the laser beam of the second intensity, the control device laser-scans the periphery through a laser beam having a third intensity less than or equal to the first intensity to enhance darkening of the peripheral area. A device for repairing defective devices.
The method according to any one of claims 9 to 14,

The liquid crystal display device is a liquid crystal display device, characterized in that the liquid crystal in the vertical alignment mode (VA MODE) is disposed in the pixel.