KR100761776B1 - Measurement Apparatus of eccentricity of Roll for Liquid Crystal Display Device - Google Patents

Abstract

In the present invention, spaced apart from each other to form a ring shape, one of the outer ring and the inner ring made of a magnetic material; A plurality of balls located between the inner ring and the outer ring; By covering both sides of the separation section formed between the inner ring and the outer ring, the outer side is provided by the ball embedded ring for measuring the eccentric roll including a first cover, the second cover made of a transparent material, first, general operating conditions The rubbing roll eccentricity can be easily measured under the following conditions, and secondly, a separate eccentric measurement system can be omitted, and a significant cost reduction can be achieved. And it is easy to determine the eccentricity, and fifth, when applied to the alignment film printing process, has the advantage of improving the flatness of the alignment film.

Description

Roll eccentricity measuring device for liquid crystal display {Measurement Apparatus of eccentricity of Roll for Liquid Crystal Display Device}             

1 is a schematic cross-sectional view of a liquid crystal panel for a general liquid crystal display device.

2 is a manufacturing process flow chart of a typical liquid crystal cell.

3 is a front view of a conventional rubbing device.

4 is a side view of a conventional rubbing device.

5 is a view of a rubbing roll eccentric measurement using a conventional dial gauge.

6 is a front view of a rubbing device including a laser sensor for measuring the roll eccentricity according to the applicant's Korean Patent Application No. 2001-0027219.

7 is a side view of the rubbing device of FIG. 6.

8 is a front view of a rubbing device including a ball embedded ring for measuring roll eccentricity according to the present invention.

Figure 9 is a perspective view of the ball embedded ring and rubbing roll in accordance with the present invention.

10 is a cross-sectional view of the ball embedded ring of FIG.

Figure 11 is an exploded perspective view of the ball embedded ring of Figure 10.

<Description of the symbols for the main parts of the drawings>

214: inner ring 216: outer ring

218: ball 220a: first cover

220a: second cover

The present invention relates to a liquid crystal display device, and more particularly, to a roll eccentric measuring device for a liquid crystal display device.

Recently, liquid crystal displays have been spotlighted as next generation advanced display devices having low power consumption, good portability, technology-intensive, and high added value.

In general, in order to use a liquid crystal for a display, a liquid crystal cell must be manufactured.

The liquid crystal cell has a structure in which a liquid crystal is filled between two glass substrates or a transparent plastic substrate. A transparent electrode (common electrode, pixel electrode) is formed on the substrate so that voltage can be applied to the liquid crystal. The transparent electrode serves to control on / off by applying a voltage to the liquid crystal.

That is, the light transmission amount of the liquid crystal display device is controlled by the voltage applied to the transparent electrode, and displays characters / images by the optical shutter effect.

Among such liquid crystal display devices, an active matrix liquid crystal display device having a switching element capable of controlling voltage on / off for each pixel is attracting the most attention due to its excellent resolution and video performance.

The liquid crystal display device uses a substrate that has undergone an array substrate manufacturing process for forming a switching element and a pixel electrode and a color filter substrate manufacturing process for forming a color filter and a common electrode, and a liquid crystal cell process between the two substrates. Completed through

The liquid crystal cell process may be characterized in that the process is relatively little compared to the array process or the color filter process. The overall process can be roughly divided into an alignment layer forming process for forming the liquid crystal molecules, a cell gap forming process, a cell cutting process, and a liquid crystal injection process. A liquid crystal panel as a component is produced.

1 is a schematic cross-sectional view of a liquid crystal panel for a general liquid crystal display device.

As shown, the upper and lower substrates 10 and 30 are spaced apart from each other by a predetermined distance, and the liquid crystal layer 50 is interposed between the upper and lower substrates 10 and 30.

A gate electrode 32 is formed on the transparent substrate 1 of the lower substrate 30, and a gate insulating layer 34 is formed on the gate electrode 32. The semiconductor layer 36 in which the active layer 36a and the ohmic contact layer 36b are sequentially stacked is formed at a position covering the gate electrode 32, and the semiconductor layer 36 is spaced apart from each other by a predetermined interval. The source and drain electrodes 38 and 40 are formed, and a channel (ch; channel) in which the active layer 36a is partially exposed is formed in the separation interval between the source and drain electrodes 38 and 40. Phosphorus thin film transistor (T) to form.

Although not shown in the drawings, a gate line is formed in a first direction by being connected to the gate electrode 32, and a data line is formed in a second direction crossing the first direction and is connected to the source electrode 38. The area where the gate and the data line cross each other is defined as the pixel area P. FIG.

In addition, a passivation layer 42 having a drain contact hole 44 is formed on the thin film transistor T, and is connected to the drain electrode 40 through the drain contact hole 44 to form the pixel region. In (P), the pixel electrode 48 which is one electrode which applies a voltage to the liquid crystal layer 50 is formed.

A lower alignment layer 46 is formed on the passivation layer 42 and the pixel electrode 48 to easily induce alignment of the liquid crystal layer 50.

A color filter 14 is formed below the transparent substrate 1 of the upper substrate 10 to filter only light of a specific wavelength band at a position corresponding to the pixel electrode 48. The color filter 14 The black matrix 12 is formed at the boundary of each color to block light leakage and inflow of light into the thin film transistor T.

A common electrode 16, which is another electrode for applying a voltage to the liquid crystal layer 50, is formed below the color filter 14 and the black matrix 12, and below the common electrode 16. An upper alignment layer 18 is formed to play the same role as the lower alignment layer 46.

Meanwhile, in order to prevent leakage of the liquid crystal layer 50 interposed between the upper and lower substrates 10 and 30, the edges of the upper and lower substrates 10 and 30 are sealed by the seal pattern 60. have.

The seal pattern 60 maintains a constant cell gap between the two substrates prior to the bonding process of the upper and lower substrates 10 and 30, thereby facilitating liquid crystal injection in a subsequent process, and also injecting the injected liquid crystal to the outside. It serves to prevent leakage.

Hereinafter, a liquid crystal cell process using the upper and lower substrates will be described in detail with reference to the accompanying drawings.

FIG. 2 is a flowchart of a manufacturing process of a general liquid crystal cell, and assumes a process using two substrates having a plurality of cells formed through a color filter process or an array process.

ST1 is a step of initial washing the upper substrate as the color filter substrate and the lower substrate as the array substrate.

This step is for removing foreign matter that may be present on the substrate before applying the alignment layer.

ST2 is a step of forming an alignment film on the upper and lower substrates having undergone the ST1 step, the step of applying an alignment film made of a polymer thin film, and baking the applied alignment film through a pre-dryer and a curing furnace And rubbing the surface of the calcined alignment film.

This alignment film forming step is a necessary step for normal liquid crystal driving and uniform display characteristics, and it is particularly important to apply the alignment film uniformly and uniformly over a large area in this step.

As the polymer thin film constituting the alignment layer, a polyimide film is mainly used.

In the rubbing treatment step, the alignment layer is rubbed in a predetermined direction using a rubbing cloth, and the liquid crystal molecules are aligned according to the rubbing direction.

ST3 is a step of forming a seal pattern on the substrate passed through the ST2 step and dispersing a spacer.

The seal pattern forms a gap for injecting the liquid crystal, and serves to prevent leakage of the injected liquid crystal.

The seal pattern is a process of forming a sealant made of a thermosetting resin mixed with glass fibers in a desired pattern, and is mainly formed by screen printing.

The spacer dispersing step is a step for maintaining a precise and uniform gap between the upper and lower substrates.

Therefore, the spacers should be dispersed at a uniform density on the substrate, and the dispersion method can be largely divided into a wet dispersion method in which a spacer is mixed and sprayed with alcohol or the like, and a dry dispersion method in which only the spacer is dispersed.

In general, since a cell of an array substrate having a connection with an external circuit has a larger area than a color filter substrate cell, a seal pattern is mainly formed on the color filter substrate to reduce adhesion failure, and the spacer spread forms a lower substrate. Primarily in array substrates.

ST4 is a step of joining the upper and lower substrates passed through the ST3, the degree of alignment of the two substrates is determined by the margin given in the design of the two substrates, the precision of several micrometers (μm) Is required.

When the alignment between the two substrates is out of the margin given, light leaks out and does not have the desired characteristics when driven.

In this step, a plurality of cells configured on the upper and lower substrates are joined to correspond to each other.

In ST5, the substrate bonded through the step ST4 is cut in cell units.

Generally, after forming a large number of cells in a large-area glass substrate, a process of separating them into cell units is performed, which is a cell cutting process.

In the cell cutting process, a scribe is formed on both surfaces of the bonded substrate using a diamond pen or a tungsten carbide cutting wheel, which is harder than glass, to form a cutting line on the substrate surface. And a break step of breaking and separating the cells into individual cells by applying a force to the cutting line.

ST6 is a step of injecting liquid crystal into the cell through the ST5 step.

The unit cell has a gap of several μm in an area of several hundred cm 2. As a method of effectively injecting liquid crystal into a cell of such a structure, a vacuum injection method using a pressure difference inside and outside the cell is widely used.                         

After the liquid crystal injection, a process of encapsulating the liquid crystal injection hole with an end seal is performed for the purpose of blocking the liquid crystal injection hole from the outside.

Next, the liquid crystal cell which has passed all the above-described steps is attached to the outer side of the liquid crystal cell selected through the quality test, respectively, and then connected to the driving circuit to complete the liquid crystal display device.

In order to manufacture such a liquid crystal cell, various rollers are used.

For example, anilox roll, doctor roll and rubbing roll of the alignment film printing process are typical rollers, and the most important performance of these rollers is one side of the center of gravity during rotation. There should be no biased state.

In particular, if the rubbing treatment is unevenly performed on the alignment film due to the eccentricity of the rubbing roll in the rubbing process, the initial alignment of the liquid crystal may be disturbed, resulting in poor image quality.

Hereinafter, the rubbing device used in the rubbing process will be described in more detail with reference to the drawings.

3 is a front view of a conventional rubbing device, Figure 4 is a side view.

As shown, the rubbing device has a rubbing head 64 having a support 62 at both ends, and a rubbing roll 66 supported by the support 62 is positioned below the rubbing head 64. do. The rubbing roll 66 is surrounded by a rubbing cloth 68, and a motor 70 for operating the rubbing roll 66 is located at one side of the rubbing head 64.

Accordingly, rubbing is performed by the rubbing roll 66 being rotated by the motor 70 so that the rubbing cloth 68 rubs the surface of the substrate on which the alignment film is formed.

However, in such a rubbing device, since there is no tool which can measure the eccentricity of a rubbing roll, it is difficult to control a rubbing roll correctly, and defects are easy to produce.

Therefore, in the related art, a method of measuring the eccentricity of the rubbing roll using a dial gauge, which is a length gauge for comparing a kind of length, has been used.

FIG. 5 is a view of a rubbing roll eccentric measurement using a conventional dial gauge, and is measured using a rubbing roll in a state in which a rubbing cloth is not wound.

As shown, the first and second dial gauges 72 and 74 are positioned below the rubbing rolls 66 of the rubbing device described above with reference to FIGS. 3 and 4 in contact with both ends of the rubbing rolls 66. The board | substrate 76 which connects this 1st, 2nd dial gauge is located in the lower part of this 1st, 2nd dial gauge 72 and 74. As shown in FIG.

Conventionally, according to the degree of shaking according to the rotation of the rubbing roll 66, the dimensions appearing on each of the scale plates (72a, 74a) of the first and second dial gauges (72, 74) are compared with each other, Eccentricity was measured.

However, the measurement unit of such a dial gauge is 0.01 mm to 0.001 mm, and since the change in scale is measured by eye measurement, a measurement error occurs and a problem occurs when rubbing occurs.

In order to improve this problem, the applicant has filed a rubbing device that can measure the eccentricity of the rubbing roll using a laser sensor as follows.

6 and 7 illustrate a rubbing device according to Korean Patent Application No. 2001-0027219 of the applicant, and FIG. 6 shows a front view and FIG. 7 shows a side view.

6 and 7, the rubbing device has a rubbing head 110 having a support 120 at both ends, and a rubbing roll 130 supported by the support 120 under the rubbing head 110. ) Is located. The rubbing roll 130 is surrounded by the rubbing cloth 140, and a motor 150 for operating the rubbing roll 130 is located at one side of the rubbing head 110. The laser sensor 170 is attached to the rubbing head 110 by the sensor holder 160 at a predetermined interval in front of the rubbing head 110. The laser sensor 170 is configured to be movable, and each laser sensor 170 is connected to a measurement system 180 made of a computer. In addition, the laser sensor 170 has a light emitting portion and a light receiving portion that emit and receive laser light.

Therefore, in the rubbing device, after the laser light from the light emitting part of the laser sensor 170 reaches the object, it is detected and reflected into the light receiving part and records in the measuring system 180. By comparing the data recorded in this way for each position, the eccentricity of the rubbing roll 130 can be measured.

At this time, the center 2nd laser sensor 170 is not used for eccentricity measurement of a rubbing roll.

As such, the eccentricity of the rubbing roll can be measured using the laser sensor, and the rubbing roll can be measured even during the rubbing process, thereby preventing rubbing defects.

However, the method of measuring the rubbing roll eccentricity using the laser sensor device as described above has some disadvantages as follows.

First, since the laser sensor equipment must be equipped with a laser sensor, a computer with a built-in rubbing roll eccentric measurement system, and the like, expensive equipment costs are required.

Second, the rubbing roll eccentricity measurement is often difficult to measure simply.

Third, the lifetime of the laser sensor is unclear, and expensive cost is required even when the laser sensor is replaced.

In order to improve such a problem, the present applicant aims to provide a rubbing roll eccentric measuring apparatus that can facilitate the rubbing roll eccentric measurement without a separate rubbing roll eccentric measurement system.

In order to achieve the above object, in the present invention is spaced apart from each other by a predetermined shape to form a ring, one of the outer ring and the inner ring made of a magnetic material; A plurality of balls located between the inner ring and the outer ring; Covering both sides of the separation section formed by the inner ring and the outer ring, the outer side is provided with a ball embedded ring for measuring the eccentric roll comprising a first, second cover made of a transparent material.

The ball-embedded ring is attached to both ends of the rubbing roll of the rubbing device for a liquid crystal display device to measure the eccentricity of the rubbing roll, and the rubbing device includes a rubbing head having supports at both ends, and a lower portion of the rubbing head. Located in and supported by the support and the roll, the device including a motor for operating the rubbing roll and located on one side of the rubbing head.

The transparent material is preferably made of acryl, and the circumferential lengths of the inner ring and the rubbing roll have a value corresponding to each other.

The balls are made of a magnetic material and have the same weight.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

8 is a front view of a rubbing device including a ball embedded ring for measuring the eccentric roll in accordance with the present invention, Figure 9 is a perspective view of the ball embedded ring and rubbing roll according to the present invention.

As shown, there is a rubbing head 204 having a support 202 at both ends, which is supported by the support 202 under the rubbing head 204, and at both ends of the connection with the support 202. A rubbing roll 208 is provided with a ball-incorporating ring 206, respectively, and a motor 212 for operating the rubbing roll 208 is located at one side of the rubbing head 204.

In the eccentric measuring method of the rubbing roll 208 according to the present invention, the rubbing roll 208 is rotated while comparing the internal ball distribution of the ball-integrated ring 206 mounted on both ends of the rubbing roll 208, and rubbing. It is to measure which side the roll 208 is biased.

The ball embedded ring 206 is preferably formed in a structure that is easily removable from the rubbing roll 208.

Hereinafter, the structure of the ball embedded ring 206 will be described in more detail with reference to the accompanying drawings.

10 and 11 are views of the ball embedded ring of FIG. 9, FIG. 10 is a cross-sectional view, and FIG. 11 is an exploded perspective view of a part of the ball embedded ring of FIG. 10.

As shown, the ball embedded ring 206 according to the present invention is the inner ring 214, and the outer ring 216 spaced apart from the inner ring 214 by a predetermined interval, surrounding the outside of the inner ring 214 ) And a plurality of balls 218 embedded between the inner ring 214 and the outer ring 216, and a first surface covering both sides corresponding to the separation section between the inner ring 214 and the outer ring 216. And two covers 220a and 220b.

At this time, the inner ring 214 is characterized in that it has a diameter corresponding to the circumferential length of the rubbing roll (208 of Figure 9) to measure the eccentricity.

In addition, the diameter of the ball 218 to have a value smaller than the separation distance between the inner ring 214 and the outer ring 216, so as to have mobility during rotation, in particular, the weight of all the balls 218 It is important to do the same.

Furthermore, in order to control the distribution of the ball 218 when the rubbing roll 208 rotates, the material constituting the outer ring 216 is made of a magnetic material, and the ball 218 is formed of a magnetic material. It is preferable that the ball 218 is attached to the inner wall of the outer ring 216 by the suction force of the outer ring 216.

However, the present invention also includes an example in which the inner ring 214 is formed of a magnetic material, and the ball 218 is attached to the inner wall of the inner ring 214.

In order to easily observe the distribution of the inner ball 218 of the ball embedded ring 206 from the outside, the outer surface of the first and second covers 220a and 220b may be mounted on the outer surface of the rubbing roll 208 of FIG. 9. The located side is made of a transparent material, preferably formed of acrylic.

However, the roll eccentricity measurement roll which concerns on this invention is not only used for a rubbing apparatus, but is applicable also as an apparatus which measures the eccentricity of the roll for orientation film printing apparatuses.

As described above, by measuring the eccentricity of the rubbing roll by mounting the ball embedded ring according to the present invention, has the following advantages.

First, the rubbing roll eccentricity can be easily measured under normal working conditions.

Second, since a separate eccentric measurement system can be omitted, significant cost savings can be obtained.

Third, once made, it can be used semi-permanently.

Fourth, operation and eccentricity discrimination are easy.

Fifth, the flatness of the alignment film can be improved when applied to the alignment film printing process.

Claims (7)

Spaced apart from each other to form a single ring shape, one of which comprises an outer ring and an inner ring made of a magnetic material; A plurality of balls located between the inner ring and the outer ring; Covers both sides of the separation section formed by the inner ring and the outer ring, the outer side is the first, second cover made of a transparent material Ball embedded ring for measuring the eccentric roll comprising a. The method of claim 1, And the ball embedded ring is attached to both ends of the rubbing roll of the rubbing device for a liquid crystal display device, and the ball embedded ring for measuring the eccentricity of the rubbing roll. The method of claim 2, The rubbing device includes a rubbing head having a support at both ends, a rubbing roll positioned below the rubbing head and supported by the support, and a motor positioned at one side of the rubbing head to operate the rubbing roll. Ring with built-in ball for eccentric roll measurement. The method of claim 1, The transparent material is an acrylic ring embedded ball for measuring the eccentric roll. The method of claim 2, The inner ring and the circumferential length of the rubbing roll ball embedded ring for measuring the eccentric roll having a value corresponding to each other. The method of claim 1, The ball is a ball embedded ring for eccentric roll measurement of magnetic material. The method of claim 1, The plurality of balls having the same weight with each other, the ball embedded ring for eccentric roll measurement.

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