KR20060105439A - Mother substrate, liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

A manufacturing method of a liquid crystal display device which suppresses generation of line unevenness on the surface of a liquid crystal panel during a rubbing process is provided. The dummy panel portion 31 is formed on the mother substrate 10. The dummy panel portion 31 is disposed between the liquid crystal panel portion and the liquid crystal panel portion and between the liquid crystal panel portion and the mother substrate 10 end. In addition, the dummy panel part 31 is set as the same structure as the color filter 2. Therefore, the surface state, such as hardness of the whole mother substrate 10, becomes uniform. As a result, occurrence of line unevenness at the time of rubbing caused by the surface state between the liquid crystal panel portion and the liquid crystal panel portion and between the liquid crystal panel portion and the mother substrate 10 end is different from the liquid crystal panel portion can be suppressed.

Mother board, dummy panel, color filter, rubbing, line stain

Description

Mother board, liquid crystal display device and manufacturing method thereof {MOTHER SUBSTRATE, LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF}

1 is a plan view showing the configuration of a mother substrate on the color filter substrate side according to the first embodiment;

FIG. 2 is a view showing the rubbing treatment of the mother substrate on the color filter substrate side according to the first embodiment; FIG.

3 is a cross-sectional view showing a state in which a mother substrate on the color filter substrate side and a mother substrate on the array substrate side are bonded to each other according to the first embodiment;

4 is a cross-sectional view showing a configuration of a mother substrate on the color filter substrate side according to Example 2;

5 is a cross-sectional view showing a configuration of a mother substrate on the color filter substrate side according to the third embodiment;

6 is a cross-sectional view showing the configuration of a mother substrate on the color filter substrate side according to the fourth embodiment.

[Explanation of symbols on the main parts of the drawings]

1, 12: transparent insulating substrate 2: color filter

3: Panel outline 5: Spacer in seal

6 pixel electrode, 7 in-plane spacer

8, 38: black matrix 9: colored layer

10 mother board 11 transparent electrode

31: dummy panel portion 33: rubbing roller

39: dummy colored layer 40: dummy transparent electrode

50: alignment layer

The present invention relates to a mother substrate, a liquid crystal display device and a manufacturing method thereof.

The liquid crystal display device is composed of a liquid crystal panel, a polarizing plate, a backlight, and the like. The liquid crystal display device is formed in the following order.

First, a transparent insulating substrate (array substrate, first substrate) on which thin film transistors, alignment films, etc. are laminated, and a transparent insulating substrate (color filter substrate, second substrate), on which color filters (CF), alignment films, etc. The spacers are stacked at predetermined intervals using the prepared spacers.

Subsequently, after adhering by the real substance provided in the periphery, liquid crystal is inject | poured from the liquid crystal injection hole formed in a part of real substance. And a liquid crystal panel is formed by sealing a liquid crystal inlet.

Thereafter, a polarizing plate is attached to the outside of both substrates of the liquid crystal panel, and a backlight is disposed on one substrate side of the liquid crystal panel to manufacture a liquid crystal display device.

Here, in the liquid crystal display device, in order to control the arrangement of the liquid crystal molecules of the liquid crystal injected between the transparent insulating substrates, it is necessary to perform an alignment process on the alignment film. As this alignment treatment, for example, a rubbing treatment is used.

A rubbing process is a method of carrying out an orientation process by moving a mother board | substrate (substrate which has several color filter substrate or an array substrate) which affixed the rubbing cloth, and fixed on the rotating rubbing roller on a stage. Here, a rubbing woven fabric is produced by weaving yarns made of materials such as rayon and cotton.

At the time of a rubbing process, the space | interval of a rubbing cloth and a board | substrate is hold | maintained constantly, and only a prescribed amount is pressed down on a rubbing cloth.

In particular, when a rubbing process is performed on a mother substrate having a plurality of liquid crystal panel portions (regions of the mother substrate to be liquid crystal display devices, that is, regions of the color filter substrate or array substrate), a liquid crystal panel different from the liquid crystal panel portion of the mother substrate Between the portions, a film such as an alignment film or the like is not formed, or only an overcoat (OC) is formed or only ITO is formed, and a portion between the liquid crystal panel portion and the liquid crystal panel portion and the portion where the liquid crystal panel portion is formed is the mother substrate surface. Roughness, hardness, etc. are different.

Therefore, when rubbing a liquid crystal panel part, and when rubbing between a liquid crystal panel part and a liquid crystal panel part, or between a liquid crystal panel part and a mother board | substrate, states, such as the bending of a rubbing fabric, differ.

As a result, after the rubbing treatment, line unevenness (line unevenness) can be seen in the liquid crystal panel portion. Since the part in which line unevenness was formed differs from another position in the orientation direction of a liquid crystal, it might show up as unevenness at the time of lighting of a liquid crystal display device.

Therefore, in the invention described in Patent Document 1, on a mother substrate on which the liquid crystal panel is chamfered, a continuous metal species surrounding each liquid crystal panel portion around each liquid crystal panel (liquid crystal panel portion) on the mother substrate The dummy pattern which consists of these is formed.

Further, in the invention described in Patent Document 2, a plurality of marks and a dummy pattern of the same material used for alignment or the like are formed to surround the liquid crystal panel portion.

[Patent Document 1] Japanese Patent Laid-Open No. 10-247765

[Patent Document 2] Japanese Utility Model Disclosure Pyung Hwa 05-075741

[Initiation of invention]

However, in the invention described in Patent Literature 1, since a dummy pattern is not formed between the liquid crystal panel portion and the liquid crystal panel portion, between the liquid crystal panel portion and the liquid crystal panel portion and between the liquid crystal panel portion and the mother substrate end. The surface condition is different. In addition, the dummy pattern is provided with the structure different from a liquid crystal panel part. Therefore, the state of a mother substrate surface is not uniform, and generation | occurrence | production of line stain cannot be suppressed.

Moreover, in the invention described in patent document 2, although the dummy pattern is formed so that a liquid crystal panel part may be enclosed, the dummy pattern uses the same material as a mark, and is not the same structure as a liquid crystal panel part. Therefore, when rubbing a liquid crystal panel part and rubbing a dummy panel part, a rubbing fabric state changes and it is difficult to suppress line unevenness.

It is therefore an object of the present invention to provide a method for manufacturing a liquid crystal display device which suppresses occurrence of line unevenness on the surface of a liquid crystal panel during a rubbing treatment.

The invention described in claim 1 is a manufacturing method of a liquid crystal display device in which a first substrate on which scan lines and signal lines are arranged and a second substrate on which color filters are arranged are arranged to face each other with a liquid crystal layer interposed therebetween. In the process of manufacturing a step, forming a dummy panel portion having the same structure as the color filter on the mother substrate having a plurality of the second substrate, so as to surround a region in which the color filter is disposed, and the dummy panel It is characterized by including the process of rubbing a said mother substrate after a part formation.

Best Mode for Carrying Out the Invention

In the liquid crystal display device, a drive circuit is connected to a liquid crystal panel which is formed by sandwiching a liquid crystal layer by holding a spacer between the array substrate (first substrate) and the color filter substrate (second substrate) and sandwiching the liquid crystal layer. It is comprised on the backlight (lighting apparatus) arrange | positioned at the board | substrate side.

Generally, the driving circuit includes a tape-shaped film carrier (TCP: Tape Carrier Package) mounted with an LSI for driving a TFT, and a printed circuit board (PCB) for sending power or image signals to the film carrier. Consists of.

The array substrate includes a transparent insulating substrate, a plurality of scanning lines formed of a metal layer provided on the transparent insulating substrate, a plurality of signal lines arranged in a matrix form through the scanning lines and the insulating layer, the plurality of scanning lines and the plurality of signal lines And a plurality of pixel electrodes provided in correspondence with respective intersections of and an alignment film coated on the surface thereof.

The color filter substrate is composed of a transparent insulating substrate, a black matrix which is a light shielding layer formed on the transparent insulating substrate, a colored layer, a transparent electrode, and an alignment film. Between the array substrate and the periphery of the color filter substrate, an actual material surrounding the region where the liquid crystal layer is present outside the display region is disposed to fix both of them.

And in this invention, the dummy panel part is arrange | positioned so that the area | region in which the color filter on a mother substrate in a color filter substrate side is provided is provided.

Hereinafter, a liquid crystal panel and a manufacturing method thereof among liquid crystal display devices will be described with reference to the accompanying drawings.

Example 1

The liquid crystal panel is composed of a liquid crystal layer interposed between the array substrate and the color filter substrate by a spacer. That is, the array substrate on which the scanning lines and the signal lines are arranged and the color filter substrate on which the color filters are arranged are arranged to face each other with the liquid crystal layer interposed therebetween.

First, the mother substrate 10 on the color filter substrate side is formed. FIG. 1: is a top view which shows the structure of the mother substrate 10 in which the part used as a color filter substrate was formed in multiple numbers.

In Fig. 1, a plurality of color filters CF (2 in the example of Fig. 2) are formed in a matrix on a transparent insulating substrate 1 such as a glass substrate. Moreover, the broken line part has shown the external shape (panel outline 3) of the liquid crystal panel part (panel part: area used as a color filter substrate) in the mother substrate 10. As shown in FIG.

A dummy panel portion 31 is formed between the liquid crystal panel portion and the liquid crystal panel portion and between the ends of the transparent insulating substrate 1. That is, the dummy panel portion 31 is formed to surround the color filter 2.

Next, the rubbing process of the mother substrate 10 is performed. FIG. 2 is a diagram illustrating a state of the mother substrate 10 during the rubbing process. By moving the bottom of the rubbing roller 33 in the substrate flow direction, the rubbing treatment of the mother substrate 10 is performed.

Next, a mother substrate on the array substrate side is created. The configuration of the mother substrate on the array substrate side will be described later.

Subsequently, the mother substrate 10 and the mother substrate on the array substrate side are laminated and bonded. 3 is a cross-sectional view showing a state in which the mother substrate 10 and the mother substrate on the array substrate side are laminated and bonded.

The transparent insulating substrate 1 is disposed on the transparent insulating substrate 12 through the interior spacers 5 and the in-plane spacers 7 in the actual material 4.

A color filter 2 is formed in the liquid crystal panel portion of the transparent insulating substrate 1. The color filter 2 includes a black matrix 8 made of multilayered chrome, a colored layer 9 of RED, GREEN, and BLUE, a transparent electrode 11 such as indium tin oxide (ITO), and an alignment film 50. )

The dummy panel portion 31 of the transparent insulating substrate 1 also has the same structure as the liquid crystal panel portion. That is, the dummy color filter 32 is formed on the transparent insulating substrate 1, and the dummy color filter 32 includes a black matrix (dummy black matrix) 38, RED, GREEN and BLUE of a dummy part made of multilayer chrome or the like. The dummy colored layer 39 of three colors, the dummy transparent electrode 40 such as ITO, and the alignment film 50.

For example, the black matrix 8 and the black matrix 38 are patterned by carrying out exposure and development after depositing multilayer chromium by sputtering or the like.

The colored layer 9 and the dummy colored layer 39 are formed by a pigment dispersion method, a dyeing method, an electrodeposition method, or the like.

The transparent electrode 11 and the dummy transparent electrode 40 are formed of a transparent electrode material such as ITO using a mask sputtering method or the like, for example.

The liquid crystal panel portion on the array substrate side is composed of a pixel electrode 6 formed on the transparent insulating substrate 12, a transistor, a scan wiring, a signal wiring, an alignment film 50, and the like. In addition, the alignment film 50 is formed in the dummy panel portion on the array substrate side.

The mother substrate on the array substrate side can be produced by laminating (patterning) while repeating the steps of film formation, resist coating, exposure, development, etching, and resist stripping.

In addition, the orientation film 50 apply | coated to the mother substrate 10 and the mother substrate of an array substrate is rubbing process by the predetermined method.

That is, after the step of forming the dummy panel portion 31 having the same configuration as the color filter 2 on the mother substrate 10 so as to surround the area where the color filter is disposed, the mother substrate 10 is subjected to a rubbing treatment. have.

The liquid crystal panel mixes an indoor spacer 5 made of, for example, glass fiber or the like into a real material 4 made of a thermosetting epoxy resin, and is applied to a peripheral portion of the color filter substrate or the array substrate by screen printing or using a dispenser. Then, the upper and lower substrates are supported by the in-plane spacers 7 and the like, and laminated at predetermined intervals to perform a curing treatment.

In this way, the mother substrate 10 shown in FIG. 2 and the mother substrate by the side of the array substrate are laminated | stacked.

Next, in the state which adhere | attached the mother substrate 10 and the mother substrate by the side of the array substrate, the liquid crystal panel part is isolate | separated in the location corresponding to the panel outline 3 shown in FIG. That is, the dummy panel portion 31 is removed by separating the liquid crystal panel portions in which the array substrate and the color filter substrate are disposed to face each other.

And a liquid crystal is inject | poured into the separated liquid crystal panel part, and the injection hole is sealed with a sealing material, and the final liquid crystal panel is obtained.

In the liquid crystal display device according to the present embodiment, the dummy panel portion 31 is formed between the liquid crystal panel portion and the liquid crystal panel portion on the mother substrate 10 and between the liquid crystal panel portion and the mother substrate 10 end. And the structure of the dummy panel part 31 has the structure similar to the liquid crystal panel part.

Therefore, the hardness and surface roughness between the liquid crystal panel portion and the liquid crystal panel portion and between the liquid crystal panel portion and the mother substrate 10 end are equivalent to the surface of the liquid crystal panel.

As a result, generation of line unevenness at the time of the rubbing process resulting from a thing different between a liquid crystal panel part and a liquid crystal panel part, and a liquid crystal panel part and a mother substrate 10 end from a liquid crystal panel part can be suppressed.

Moreover, the dummy panel part 31 is formed using the black matrix 38, the dummy colored layer 39, and the dummy transparent electrode 40. FIG.

Since the black matrix 38 and the dummy colored layer 39 are formed by exposing using a mask, the black matrix 38 and the dummy colored layer 39 can be formed without increasing the process. In addition, since the dummy transparent electrode 40 is also formed by an exposure method, a mask sputtering method, etc., it can form without increasing a process.

As a result, line unevenness can be suppressed without the cost increase by the increase of process number.

In the mother substrate 10 according to the present embodiment, since the dummy panel portion 31 is removed when the liquid crystal panel portion is separated, adverse effects of the liquid crystal panel due to the dummy panel portion 31 remaining can be prevented.

The transparent electrode 11 may be formed on the entire surface of the substrate. However, the dummy panel portion 31 is not formed in the alignment mark portion on the substrate and the pattern prohibition region portion near the mark.

Example 2

4 is a cross-sectional view showing the configuration of the mother substrate 10 used in the liquid crystal display device according to the present embodiment.

The black matrix 8 and the colored layer 9 are formed on the transparent insulating substrate 1. Moreover, the black matrix 38 and the dummy colored layer 39 of the dummy part are formed at a predetermined distance from the black matrix 8.

And overcoat 13 is apply | coated to the whole surface as a protective film so that the black matrix 8, the colored layer 9, the black matrix 38, and the dummy colored layer 39 may be covered.

Since the mother substrate 10 according to the present embodiment has the configuration as described above, the mother substrate 10 is used even in a liquid crystal display device in which a transparent electrode is unnecessary, such as an in-plane switching (IPS) driving method. The state of the surface becomes uniform, which can suppress line staining.

Example 3

5 is a cross-sectional view showing the configuration of the mother substrate 10 according to the present embodiment. The same code | symbol is attached | subjected to the structure same as Example 1, and the overlapping description is abbreviate | omitted.

In the mother substrate 10 according to the present embodiment, the black matrix 38 is not formed as compared with the mother substrate 10 according to the first embodiment.

Even when such black matrix 38 is not formed, since the dummy panel portion has the same configuration as the liquid crystal panel portion, generation of line unevenness can be suppressed without increasing the manufacturing process.

Example 4

6 is a cross-sectional view showing the configuration of the mother substrate 10 according to the present embodiment.

In Example 2, although the overcoat 13 was formed in the uppermost layer, in the present Example, the transparent electrode 11 and the dummy transparent electrode 40 are further formed on the overcoat 13. As shown in FIG.

Since other configurations are the same as those in the second embodiment, the same components are assigned the same reference numerals, and redundant descriptions are omitted.

Even in the case where the dummy transparent electrode 40 is formed on the uppermost layer, since the liquid crystal panel portion and the dummy panel portion have the same configuration, generation of line unevenness can be suppressed as in the first embodiment.

According to the invention described in claim 1, since the surface state on the mother substrate becomes almost uniform throughout the mother substrate, the state of the rubbing fabric does not change by the rubbing treatment, and generation of line unevenness can be suppressed.

In addition, since the dummy pattern has the same configuration as the color filter, the dummy pattern can be formed without increasing the manufacturing process.

Claims (6)

A manufacturing method of a liquid crystal display device in which a first substrate on which scan lines and signal lines are arranged and a second substrate on which color filters are arranged are arranged to face each other with a liquid crystal layer interposed therebetween. Forming a dummy panel portion having the same structure as the color filter on the mother substrate having the plurality of second substrates so as to surround a region where the color filters are disposed; And rubbing the mother substrate after the dummy panel portion is formed. The method of claim 1, The dummy panel unit, A dummy black matrix and a dummy colored layer formed on the transparent insulating substrate, A dummy transparent electrode formed on the dummy black matrix and the dummy colored layer; And a dummy alignment layer formed on the dummy transparent electrode. The liquid crystal display device manufactured by the manufacturing method of the liquid crystal display device of Claim 1 or 2. The method according to claim 1 or 2, Laminating and bonding a mother substrate having the plurality of rubbing treated second substrates to a mother substrate having the plurality of first substrates; And removing the dummy panel portion by separating each panel portion on which one first substrate and one second substrate are disposed to face each other. The liquid crystal display device manufactured by the manufacturing method of the liquid crystal display device of Claim 4. A mother substrate comprising a plurality of said second substrates produced by the method for producing a liquid crystal display device according to claim 1.

Images