KR20070025463A - Jig unit for fixing polarizer for testing liquid crystal display panel and testing method used there - Google Patents

Abstract

A jig unit for fixing a polarizer for testing an LCD(Liquid Crystal Display) and a test method using the jig unit are provided to detect failure of an LCD panel with high brightness using a test polarizer having no adhesive and maintain high contrast by preventing the polarizer from being deformed. A jig unit(85) supports a test polarizer(15) used to test an LCD panel and includes a first roller(95) and a second roller(100) that rotate with the test polarizer placed between them to fix the test polarizer. The jig unit further includes a jig(90) having an opening(91) for exposing the LCD panel. One side of the first roller and one side of the second roller are connected with the jig by a connector(105) on the jig unit. The other side of the first roller and the other side of the second roller are attached/detached to/from a support(110) that supports the other sides of the first and second rollers.

Description

JIG unit fixing polarizing plate for LCD panel inspection and inspection method using same {JIG UNIT FOR FIXING POLARIZER FOR TESTING LIQUID CRYSTAL DISPLAY PANEL AND TESTING METHOD USED THERE}

1 is a perspective view showing a polarizing plate for inspection according to an embodiment of the present invention.

Figure 2 is a cross-sectional view showing a polarizing film manufacturing process of the test polarizing plate according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a distance from the upper polarizing plate for inspection to a liquid crystal display panel and a distance from the lower polarizing plate for inspection to a liquid crystal display panel according to an exemplary embodiment of the present invention.

Figure 4 is a perspective view showing a jig unit for supporting a polarizing plate for inspection according to an embodiment of the present invention.

5 is a perspective view showing that the first and second rollers of the jig unit according to the embodiment of the present invention are spaced apart from the support part.

6 is a cross-sectional view showing a test apparatus equipped with a jig unit according to an embodiment of the present invention.

7 is a side view showing a test apparatus equipped with a jig unit according to an embodiment of the present invention.

<Code Description of Main Parts of Drawing>

10 liquid crystal display panel 15 polarizing plate for inspection

30 polarizing film 35 first supporting film

40: second support film 45: protective film

50 polymer film 55 swelling bath

60: dyed bath 65: cross-linked bath

70: stretch bath 75: cleaning bath

80: drying apparatus 85: jig unit

90: jig 95: first roller

100: second roller 105: connecting portion

110: support

The present invention relates to a jig unit for fixing a liquid crystal display panel inspection polarizing plate and an inspection method using the same, in particular a jig unit for fixing a liquid crystal display panel inspection polarizing plate for easily detecting defects of the liquid crystal display panel and inspection using the same It is about a method.

In general, two substrates each having a transparent electrode formed therein are formed to face each other with a liquid crystal interposed therebetween. The liquid crystal display panel displays an image by disposing polarizers on the outside of the two substrates and applying a voltage to the liquid crystal.

Currently, liquid crystal display panels are used in mobile phones and televisions that implement color images of moving images. Therefore, the demand for high performance is gradually increasing.

If there is an abnormality in the performance of the liquid crystal display panel, the reliability as a display is lowered and the product value is lowered. Among various stages of inspection, there is a lighting test performed before attaching a polarizing plate to a liquid crystal display panel.

Since the liquid crystal display panel used for the lighting test is not attached to the polarizing plate as described above, during the lighting test, the liquid crystal display panel is placed between two polarizing plates spaced at predetermined intervals. At this time, a glass substrate or polycarbonate is used to support two polarizing plates. That is, after attaching each polarizing plate to a glass substrate or polycarbonate, the liquid crystal display panel is positioned therebetween, and then a lighting test is performed.

However, when the polarizing plate is attached to the glass substrate or the polycarbonate, foreign matter may flow between the polarizing plate and the glass substrate or the polycarbonate, and thus, it may be difficult to distinguish a defect existing in the actual liquid crystal display panel.

In addition, due to the refractive index of the glass substrate or the polycarbonate itself and the diffuse reflection of the light from the glass substrate or the polycarbonate, visibility of the lighting test is deteriorated and color coordinates are changed, thereby making it difficult to detect defects in the liquid crystal display panel.

In particular, glass substrates can be easily broken and the surface is easily scratched. If the lighting test is performed using a defective glass substrate, the detection ability of the defect is lowered due to deterioration of visibility and light leakage.

On the other hand, due to the pressure-sensitive adhesive formed on one side of the polarizing plate for attachment to the glass substrate or polycarbonate, the brightness is lowered during the lighting test, there is a problem that can not facilitate the inspection. In addition, when the polarizing plate is attached to the glass substrate or polycarbonate, the absorption side of the polarizing plate may be deformed to cause staining, thereby causing a decrease in contrast.

Accordingly, there is a growing demand for a jig unit for fixing an inspection polarizer that can easily detect an intrinsic defect of the liquid crystal display panel itself and an inspection method using the same.

The technical problem to be achieved by the present invention is to provide a jig unit for fixing the liquid crystal display panel inspection polarizing plate for easily detecting a defect of the liquid crystal display panel and an inspection method using the same.

In order to achieve the above object, the present invention includes first and second rollers for supporting a polarizing plate for inspection used in the lighting inspection of the liquid crystal display panel and rotating the inspection polarizing plate therebetween to fix the polarizing plate for inspection. It provides a jig unit characterized in that.

A jig having an opening exposing the liquid crystal display panel may be further provided.

In addition, one side of the first and second rollers is connected to the jig by a connecting portion on the jig, and the other side of the first and second rollers to be detachable from the support for supporting the other side of the first and second rollers. Can be.

The first rollers positioned at one side and the other side of the jig unit rotate in opposite directions, and the second rollers positioned at one side and the other side of the jig unit rotate in opposite directions and adjacent to the first roller. And can rotate in opposite directions.

In order to achieve the above object, the present invention comprises the steps of providing the first and second rollers formed on one side and the other side of the jig and aligning the polarizing plate for inspection between the first and second rollers and the first And rotating the second rollers to fix the inspection polarizer and inspecting the liquid crystal display panel facing the inspection polarizer. .

The preparing of the first and second rollers may include preparing first and second rollers spaced apart from one side and the other side of the jig unit with an opening in which the jig is opened in an area facing the liquid crystal display panel. It may be a step.

In addition, the providing of the first and second rollers may include providing the first and second rollers having one side connected to the connection portion on the jig and the other side detachably attached to the support portion on the jig.

The fixing of the polarizing plate for inspection may include rotating the first and second rollers formed on one side of the jig unit in opposite directions and rotating the first and second rollers formed on the other side of the jig unit. And rotating in opposite directions, wherein each of the first and second rollers formed on one side and the other side may rotate in opposite directions.

Other objects and features of the present invention in addition to the above object will become apparent from the description of the embodiments with reference to the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing a polarizing plate for inspection according to an embodiment of the present invention.

Referring to FIG. 1, an inspection polarizing plate 15 according to an exemplary embodiment of the present invention may have one side of a polarizing film 30 having a polarizing film 30 that absorbs light in a specific direction and a polarizing film 30 interposed therebetween. And a protective film 45 attached to cover the first and second support films 35 and 40 and the first and second support films 35 and 40, respectively.

The polarizing film 30 divides incident light into two polarizing components orthogonal to each other, and absorbs or disperses one component and transmits the other component. To this end, iodine absorbing only one component of incident light is adsorbed to the stretched polyvinyl alcohol.

However, due to the properties of polyvinyl alcohol having strong water affinity and iodine having sublimation, the polarizing film 30 changes and decreases when exposed to air. To prevent this, the first and second supporting films 35 and 40 are disposed on both side surfaces of the polarizing film 30. As the first and second supporting films 35 and 40, transparent triacetyl cellulose, which is a material having a phase difference close to zero, is used in order not to affect the polarization state of transmitted light. On the outer surface of any one of the first and second supporting films 35 and 40, a glare film for improving light efficiency or an anti-glare film for suppressing reflection of light on the surface by diffuse reflection of light may be stacked. Can be.

The protective film 45 is attached to cover the first and second support films 35 and 40 to prevent scratches on the surfaces of the first and second support films 35 and 40 and to prevent contamination by foreign matter.

On the other hand, the conventional polarizing plate for inspection contains an adhesive for attachment to a glass substrate or polycarbonate. For this reason, there arises a problem that the luminance is lowered during the lighting test of the liquid crystal display panel. However, in the polarizing plate 15 for inspection of this invention, the adhesive is not formed in the outer side of any one of the 1st and 2nd support films 35 and 40. FIG. For this reason, the luminance is increased by 7% or more than when the lighting inspection is performed using a conventional inspection polarizing plate, so that the inspector can easily detect a defect.

The inspection polarizing plate 15 of the present invention is manufactured through a polarizing film manufacturing process as shown in FIG. The polarizing film production process starts with the introduction of a polymer film 50 such as polyvinyl alcohol having excellent in-plane uniformity and excellent dyeing affinity for iodine as the polarizing film 30. In this case, another polymer film, such as polyethylene terephthalate, ethylene-vinyl acetate copolymer, may be used as the polymer film 50.

When the polymer film 50 is added, the swelling process is performed in the swelling bath 55 filled with the aqueous solution. At this time, since the polymer film 50 is washed with water, foreign substances such as dust existing on the surface of the polymer film 50 are removed. In addition, since the polymer film 50 is swollen, dyeing nonuniformity and the like can be prevented.

After the swelling process, the polymer film 50 is immersed in a dye bath 60 filled with a dichroic solution made of a dichroic material such as iodine and a water-soluble solvent capable of dissolving the dichroic material. Proceed. In this case, organic dyes such as Congo Red and Supra Blue G may be used instead of iodine as a dichroic substance. Through this dyeing process, the polymer film 50 has an optical property capable of absorbing light in a specific direction.

The polymer film 50 stained with iodine is immersed in a crosslinking bath 65 containing a crosslinking solution in which a crosslinking agent such as boronic acid and glutaraldehyde is dissolved in water, which is a solvent, to perform a crosslinking process. At this time, iodide may be added to the crosslinking solution to improve in-plane uniformity of the polarizing film 30.

The polymer film 50 subjected to the crosslinking process is a drawing process in which the polymer film 50 is uniaxially stretched by being immersed in a drawing bath 70 containing a drawing solution in which boronic acid or potassium iodide is dissolved in water or an organic solvent as a solvent. Is performed.

After the stretching process, the polymer film 50 is cleaned so that the residue on the surface of the polymer film 50 is cleaned in the cleaning bath 75 filled with the aqueous solution. Thereafter, the polarizing film 30 is manufactured by drying the polymer film 50 in the drying apparatus 80 through a method such as air drying or heat drying.

After the polarizing film 30 is manufactured, first and second supporting films 35 and 40 are laminated on both surfaces of the polarizing film 30, respectively. As the first and second supporting films 35 and 40, a transparent material having excellent transparency, mechanical strength, thermal stability, moisture shielding property, and the like is used. Preferably, triacetyl cellulose having a surface sensitized by an alkali or the like is used for the first and second support films 35 and 40. Next, the protective film 45 is attached to both side surfaces of the first and second supporting films 35 and 40 to manufacture the test polarizing plate 15.

The inspection polarizing plate 15 manufactured by the above-described process is used for the lighting inspection of the liquid crystal display panel. At this time, as shown in FIG. 3, the distance A between the inspection upper polarizing plate 20 and the liquid crystal display panel 10 is 100 mm to 250 mm. More preferably, the distance A between the inspection upper polarizing plate 20 and the liquid crystal display panel 10 is 150 mm to 200 mm. In addition, the distance B between the inspection lower polarizing plate 25 and the liquid crystal display panel 10 is 1 mm to 10 mm. More preferably, the distance B between the inspection lower polarizing plate 25 and the liquid crystal display panel 10 is 2 mm to 3 mm.

A jig unit 85 as shown in Fig. 4 is used to maintain the separation distance as described above. The jig unit 85 includes a jig 90 having an opening 91 formed in the center thereof, and first and second rollers 95 and 100 for fixing the inspection polarizing plate 15.

The jig 90 has an opening 91 formed in the center thereof. Since the liquid crystal display panel is positioned to face the opening 91, the opening 91 is formed to be somewhat larger than the size of the liquid crystal display panel to be lit. Alternatively, the opening 91 may be formed to about the size of the liquid crystal display panel.

The first and second rollers 95 and 100 are installed at both sides of the jig 90 based on the opening 91. Each of the first rollers 95 provided on both sides of the jig 90 rotates in opposite directions to each other. In addition, each of the second rollers 100 provided on both sides of the jig 90 rotates in opposite directions to each other. The first and second rollers 95 and 100 on one side rotate in opposite directions. Similarly, the first and second rollers 95 and 100 on the other side also rotate in opposite directions.

That is, the first and second rollers 95 and 100 installed on one side rotate in opposite directions to tighten one side of the polarizing plate 15 for inspection, and the first and second rollers 95 and 100 installed on the other side of each other rotate. By rotating in the opposite direction and tightening the other side of the test polarizing plate 15, the test polarizing plate 15 is kept taut.

On the other hand, one side of the first and second rollers (95, 100) of both sides is connected to the jig 90 by the connecting portion 105 on the jig. The other sides of the first and second rollers 95 and 100 on both sides are attached to and supported by the support 110 on the jig. In this case, the other sides of the first and second rollers 95 and 100 on both sides may be detached from the support 110.

In order to sandwich the inspection polarizing plate 15 between the first and second rollers 95 and 100, the operator first places the inspection polarizing plate 15 between the first and second rollers 95 and 100 on the left side. Then, the handle 96 of the first roller 95 on the left side is slightly rotated in the clockwise direction. Then, the second roller 100 on the left side is rotated counterclockwise by the frictional force between the inspection polarizer 15 and the second roller 100. By the rotation of the first and second rollers 95 and 100 on the left side, the inspection polarizer 15 may be sandwiched between the first and second rollers 95 and 100 on the left side.

Similarly, the inspection polarizing plate 15 is sandwiched between the first and second rollers 95 and 100 on the right side as described above. Then, the inspection polarizer 96 can be kept taut by rotating the handles 96 attached to the first rollers 95 on both sides in opposite directions.

As shown in FIG. 5, the first and second rollers 95 and 100 may be spaced apart from the support 110 supporting one side of the first and second rollers 95 and 100. This is for the operator to display the defective part on the liquid crystal display panel when a defect occurs during the lighting test of the liquid crystal display panel.

Meanwhile, the jig unit 85 is mounted to the inspection apparatus 115 as shown in FIGS. 6 and 7.

The inspection apparatus 115 may include an index stage 120 having a stacker 130 so as to supply a liquid crystal display panel from the cassette 125, and a pre-aligner for aligning the liquid crystal display panel carried from the cassette 125. 145, a carrier 175 for transporting the liquid crystal display panel aligned by the pre-aligner 145, and a work table 200 for setting the inspection of the liquid crystal display panel transferred by the carrier 175. ).

The index stage 120 is provided with an index frame 135 under the stacker 130 to support the stacker 130. The cassette 125 is installed at one rear side of the stacker 130. The cassette 125 is installed to be pushed by the pusher and is conveyed by the conveyor 140 through the stacker 130.

The prealigner 145 includes a motor 155 installed in the main frame 150 and a plate 165 installed to rotate back and forth by the gear 160 provided in the motor 155. In the pre-aligner 145, a plurality of cylinders 170 are installed at the rear of the plate 165 so that the rear portion of the plate 165 is tilted at an angle of about 60 degrees due to the upward movement of the cylinder 170. Tilting).

The tilted plate 165 is lifted by the LCD panel as much as the gripper 190 of the carrier 175 is positioned by pushing. In this case, the liquid crystal display panel may be sucked by a plurality of adsorption pads provided on the upper portion of the plate 165, and may not fall off, thereby securing a stable position.

When the liquid crystal display panel is tilted by the pre-aligner 145 to position the liquid crystal display panel, the liquid crystal display panel is transferred to the work table 200 which is continuously installed on the left side. Done.

The carrier 175 is installed in the carrier frame 180 installed in the main frame 150. The carrier 175 is provided with a gripper 190 that can be opened to the left and right along the rails 185 provided in the upper and lower portions of the carrier frame 180, respectively. The gripper 190 has a finger 195 for holding the liquid crystal display panel from side to side.

In the work table 200, the transferred liquid crystal display panel is lifted by the rising block 205 to be in electrical contact with the probe pin to be turned on. Subsequently, the inspector performs a lighting test using the jig unit 85 on which the test polarizing plate 15 is mounted. After the lighting test, the liquid crystal display panel is manually unloaded by the inspector.

The adhesive is not formed in the polarizing plate for inspection of this invention used at the time of a lighting test of a liquid crystal display panel. As a result, since the luminance is increased, the inspector can detect a defect of the liquid crystal display panel under brighter conditions. Since the glass substrate or the polycarbonate is not used to fix the inspection polarizer without the pressure-sensitive adhesive, the refractive index and the diffuse reflection of the glass substrate or the polycarbonate do not occur. For this reason, visibility is not reduced and color coordinate variation does not occur. In addition, deformation of the polarizing plate does not occur and high contrast can be maintained.

Since the polarizing plate for inspection is fixed by a roller, it is maintained in tension during the lighting inspection.

In the detailed description of the present invention described above with reference to the preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge of the present invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the spirit and scope of the art.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (8)

And a first and a second roller supporting the polarizing plate for inspection used in the lighting inspection of the liquid crystal display panel and rotating the inspection polarizing plate between the first and second rollers to fix the polarizing plate for inspection. The method of claim 1, And a jig having an opening for exposing the liquid crystal display panel. The method of claim 2, One side of the first and second rollers is connected to the jig by a connection portion on the jig; The other side of the first and second roller jig unit, characterized in that detachable from the support for supporting the other side of the first and second roller. The method of claim 1, The first rollers located on one side and the other side of the jig unit rotate in opposite directions to each other, The second rollers located on one side and the other side of the jig unit are rotated in opposite directions to each other and the jig unit, characterized in that the rotation in the opposite direction to the adjacent first roller. Providing first and second rollers formed on one side and the other side of the jig; Aligning an inspection polarizer between the first and second rollers; Fixing the inspection polarizer by rotating the first and second rollers; And inspecting the liquid crystal display panel facing the inspection polarizing plate. The method of claim 5, Preparing the first and second rollers Inspecting the liquid crystal display panel according to claim 1, wherein the first and second rollers are spaced apart from one side and the other side of the jig unit with the opening in which the jig is opened in an area facing the liquid crystal display panel. . The method of claim 6, Preparing the first and second rollers And providing the first and second rollers having one side connected to the connection part on the jig and the other side detachably attached to the support part on the jig. The method of claim 5, Fixing the inspection polarizing plate is Rotating the first and second rollers formed on one side of the jig unit in opposite directions; Rotating the first and second rollers formed on the other side of the jig unit in opposite directions to each other, And the first and second rollers formed on the one side and the other side rotate in opposite directions.

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