JP2011113008A - Color filter for liquid crystal display and color liquid crystal display device using the same - Google Patents

Abstract

A color filter having a low height of a colored layer protrusion generated by running a colored layer end onto a BM or overlapping adjacent colored layer ends on the BM without undergoing a polishing step or OC layer formation. The purpose is to provide.
A color filter for a liquid crystal display device, comprising: a transparent substrate; a light shielding portion defining a pixel region formed on the transparent substrate; and a colored layer disposed in the pixel region. Is a range of 1.0 μm or more and 5.0 or less on the light-shielding portion, the overlapping width between adjacent colored layer end portions is 4.0 μm or less, and the difference in height of the colored layer viewed from the substrate surface is less than 0.3 μm This is a color filter for a liquid crystal display device.
[Selection] Figure 1

Description

  The present invention relates to a color filter for a liquid crystal display device and a color liquid crystal display device using the same.

  In general, a color filter for a liquid crystal display device is formed by forming a light-shielding portion called a black matrix (hereinafter referred to as BM) that partitions a pixel region on a light-transmitting substrate and a colored layer in the pixel region. It is.

  BM is formed from a resin layer containing a light shielding material such as carbon black, and a colored layer arranged in a matrix form contains pigments or dyes constituting red (R), green (G), and blue (B) colors. It consists of a resin layer.

  The colored layer is formed by applying a photosensitive colored composition on a substrate on which a BM is formed, performing patterning using a photomask and performing regular patterning processing such as development, and corresponding to a desired pattern. It is a cured film. However, during the pattern exposure process, a gap may be formed between the colored layer and the BM due to misalignment between the photomasks. When the gap is formed, light leakage (so-called white spots) occurs from the gap. Cause display defects.

  Therefore, exposure is performed so that the colored layer and the BM overlap, that is, the end of the colored layer is on the BM, thereby preventing light leakage (white spots).

  However, if the end of the colored layer rides on and overlaps the BM, a protrusion (horn) of the colored layer is formed in the vicinity of the top of the BM, which causes poor alignment of liquid crystal molecules (such as disclination). In recent years, color filters that are required to have high definition such as those for mobile use have a narrow BM line width, so that adjacent colored layer ends on the BM tend to overlap with each other, and as a result, the protrusions tend to be higher. There is.

In order to reduce the protrusion of the colored layer, as an approach from BM, for example, there are descriptions in Patent Document 1 and Patent Document 2, and as an approach from the colored layer, the molecular weight and glass transition temperature of the resin contained in the colored layer are described. Patent Document 3 with a content defining the range of the above is mentioned, and by making the shape after development of the colored layer end portion that rides on the light shielding portion into a reverse taper, the reverse taper end is dripped by the heat flow during post-baking Patent document 4 is mentioned as an indication of a technique. By using these methods, it is possible to reduce the height of the colored layer protrusions, but there is no mention of overlapping between adjacent colored pixel ends on the BM.
When the ends of adjacent pixels overlap each other on the BM, the protrusions are further increased. However, Patent Documents 1 to 4 describe the reduction in the protrusion height when a certain color rides on the BM.
In patent document 5, although it is a case where the edge parts of an adjacent pixel overlap on BM, it is the content which makes a protrusion low in a grinding | polishing process.

  In addition, there are a method (Patent Document 5) for performing the above-described polishing after producing a color filter and a method (for example, Patent Document 6) in which an overcoat (hereinafter referred to as OC) layer is provided. In addition to the increase in cost due to this, new defects such as polishing scratches and poor adhesion between the colored layer and the OC layer are caused.

JP 2008-281907 A JP 2008-281908 A JP 2006-284660 A JP 2008-152182 A JP 2008-281678 A JP 2003-344638 A

  The present invention has been made in view of the above circumstances, and even when the colored layer ends run on the BM, or even when the adjacent colored layer ends overlap on the BM, the polishing step is performed. Another object of the present invention is to provide a color filter in which the height of the colored layer protrusion generated by the overlap is low without forming an OC layer and a color liquid crystal display device using the color filter.

  The invention according to claim 1 for achieving the above object includes a transparent substrate, a light-shielding portion that defines a pixel region formed on the transparent substrate, and a colored layer disposed in the pixel region. A color filter for a liquid crystal display device, wherein the width of the colored layer running on the light shielding portion is in the range of 1.0 μm or more and 5.0 or less, and the overlapping width between adjacent colored layer ends is 4.0 μm or less, and the colored layer is shielded from light The color filter for the liquid crystal display device is characterized in that the height of the colored layer protrusion generated by the overlapping and the overlapping is less than 0.3 μm on the basis of the colored layer.

According to the second aspect of the present invention, in the color filter according to the first aspect, the thickness of the central portion of the colored layer that has been previously colored is T1, and the leading end of the colored layer that has run over the light-shielding portion and the previous colored layer have run over. When the thickness of the colored layer at the midpoint of the tip of the light shielding part on the side is T2,
T2 / T1 <0.5 (Expression 1)
The color filter for a liquid crystal display device is characterized by satisfying the above conditions.

According to a third aspect of the present invention, in the color filter according to the first aspect, the thickness of the central portion of the colored layer, which has been added later, is T3, the tip of the colored layer riding on the light shielding portion, and the side on which the colored layer rides When the thickness of the colored layer at the midpoint of the light shielding part tip is T4,
T4 / T3 <0.5 (Equation 2)
The color filter for a liquid crystal display device is characterized by satisfying the above conditions.

The invention according to claim 4 of the present invention describes the relationship between the thickness of the colored layer and the light shielding part, and when the light shielding part film thickness is H,
T1 / H ≧ 1.6 (Equation 3)
T3 / H ≧ 1.6 (Formula 4)
The color filter for a liquid crystal display device according to claim 1, wherein the condition is satisfied.

  The invention according to claim 5 of the present invention is a color liquid crystal display device using the color filter for liquid crystal display device according to any one of claims 1 to 4.

Since the color filter for a liquid crystal display device of the present invention has a narrow BM line width and can easily overlap the adjacent colored layer ends on the BM, the colored layer protrusions can be kept low for mobile and high definition use. A color liquid crystal display device excellent in display quality free from defects can be provided. In addition, since the process of applying polishing and OC layer can be reduced, the cost of the product can be reduced.

(A) is a schematic cross-sectional view showing an embodiment of a color filter for a liquid crystal display device of the present invention. (B) is the partial model expanded sectional view which expanded the (a) A section. (A)-(f) is typical structure sectional drawing which shows an example of the manufacturing process of the color filter for liquid crystal display devices of this invention.

  Hereinafter, the present invention will be described in detail, but the description described below is an example (representative example) of an embodiment of the present invention, and is not limited to these contents.

FIG. 1A is a schematic sectional view showing an embodiment of a color filter for a liquid crystal display device of the present invention. FIG. 1B is a partial schematic enlarged cross-sectional view of part A in FIG.
The color filter for a liquid crystal display device of the present invention includes a BM 21b and a colored layer 30 including a red layer 31R, a green layer 32G, and a blue layer 33B on a substrate 11.
Originally, transparent electrodes and spacers are formed on the colored layer 30, but the transparent electrodes and spacers are omitted for the sake of simplicity.

  The substrate 11 is made of a transparent material that transmits light. For example, the substrate 11 is made of a polyester resin such as polyethylene terephthalate, a polyolefin resin such as polypropylene or polyethylene, a thermoplastic resin sheet of polycarbonate, or a thermosetting resin sheet such as an epoxy resin. . As other materials, various types of glass such as quartz glass can be used for the substrate.

  The BM 21b has a stripe-shaped or matrix-shaped window portion, and a region in the window portion is a pixel region. In other words, the BM partitions the pixel area. The side of the BM at the periphery of the pixel region is an inclined surface.

  A colored layer 30 is formed in the pixel region. The colored layer 30 is a thin film composed of at least three colors (for example, a red layer 31R, a green layer 32G, and a blue layer 33B), and includes a pigment or a dye. The colored layer 30 is disposed so as to overlap the BM 21b, and the end of the colored layer 30 is disposed at least on the inclined portion of the BM 21b, preferably on the top of the BM 21b.

In the color filter having the above-described configuration, the thickness of the central portion of the colored layer 32G previously colored is T1, the pixel thickness at the midpoint of the tip of the BM21b and the tip of the BM21b on the colored layer is T2, and the rear. The thickness of the central portion of the colored layer 33B entered from T3 is T3, and the pixel thickness at the midpoint of the leading end of the BM21b and the leading end of the colored layer riding side BM21b is T4.
T2 / T1 <0.5 (Expression 1)
T4 / T3 <0.5 (Equation 2)
To meet the requirements of
When the end of the colored layer 32G and the end of the colored layer 33B overlap on the BM 21b to be larger than 0.0 μm, the end of the colored layer 33B is a point where an extended line is drawn from the contact point with the colored layer 32G and intersects with the BM 21b. .

When the BM21b film thickness is H,
T1 / H ≧ 1.6 (Equation 3)
T3 / H ≧ 1.6 (Formula 4)
To meet the requirements of

By making the shape satisfying the above inequality, even if the colored layer 30 rides on the BM 21b in the range of 1.0 μm or more and 5.0 μm or less, and the adjacent colored layer ends overlap each other at 4.0 μm or less, It is possible to reduce the height of the generated colored layer protrusion (hereinafter referred to as a horn step).
Here, the horn steps d1 and d2 are projection heights with respect to the central portion of the colored layer 30 in the overlapping portion of the colored layer 30 and the BM 21b.

  It should be noted that the horn step determined by the definition as described above is preferably maintained at 0.7 μm or less, more preferably 0.5 μm or less, particularly when the color filter is incorporated in a liquid crystal display device. It is possible to make it difficult to cause the alignment disorder of the liquid crystal generated at the periphery. Moreover, since the film thickness of the transparent electrode which covers the top part of BM and a colored layer is made uniform, the disconnection in a protrusion part (horn) can be prevented. In addition, it is possible to suppress the occurrence of defects due to the rubbing process (for example, peeling of an alignment film (not shown) provided on the colored layer and adhesion of foreign matter on the protruding portion).

  The measured values of T1, T2, T3, T4, and horn steps d1, d2 are measured using a stylus thickness meter or the cross-sectional shape of the color filter is observed with a scanning electron microscope (SEM). And can be calculated.

Hereinafter, the manufacturing method of the color filter for liquid crystal display devices of this invention is demonstrated.
2A to 2F are partial schematic cross-sectional views showing an example of a method for producing a color filter for a liquid crystal display device of the present invention.
First, a BM forming resist is applied on the substrate 11 using a roll coater, curtain coater, various printing, dipping, or other coating film forming means, and preliminarily dried to form the black photosensitive layer 21 (FIG. 2). (See (a)).
As a method for forming the black photosensitive layer 21, a BM-forming resist coating film is once formed on a support such as a film and then transferred onto a substrate.

  Next, the black photosensitive layer 21 on the substrate 11 is subjected to pattern exposure through a photomask using an active light source such as ultra-high pressure mercury, mercury vapor arc, carbon arc, xenon arc, etc., development, film curing The process is performed to form the BM 21b (see FIG. 2B).

  The film thickness of BM21b is preferably in the range of 0.2 μm to 3.0 μm, more preferably in the range of 0.5 μm to 2.0 μm. If the film thickness of the BM 21b is small, sufficient light shielding properties cannot be obtained at the time of panel display, and the backlight light leaks, resulting in display defects. On the other hand, if the film thickness of the BM 21b is large, the horn steps d1 and d2 generated due to the overlap with the colored layer 30 become large, and when the BM 21b is incorporated in a liquid crystal display device, the horn steps cause the liquid crystal alignment defect (discrete). Nation etc.).

  The line width of the BM 21b is preferably in the range of 4.0 μm to 10.0 μm, and more preferably in the range of 5.0 μm to 7.0 μm. If the line width of the BM 21b is thin, alignment during pattern exposure becomes difficult, and the protrusion of the colored layer 30 to adjacent pixels or white spots may occur. On the other hand, if the line width of the BM 21b is large, it is necessary to increase the line width of the colored layer 30 in order to maintain the aperture ratio, and it cannot be used as a high-definition color filter.

Next, a red resist is applied and dried on the substrate 11 on which the BM 21b is formed to form a red photosensitive layer, and pattern exposure, development, and film curing processes are performed through a photomask to produce a red layer 31R. (See FIG. 2 (d)). This operation is similarly performed for the green resist and the blue resist, thereby producing the green layer 32G and the blue layer 33B, and the colored layer 30 including the BM 21b, the red layer 31R, the green layer 32G, and the blue layer 33B on the substrate 11. A color filter for a liquid crystal display device in which is formed can be obtained (see FIGS. 2E and 2F).

  The thickness of the colored layer 30 is preferably in the range of 0.5 μm to 4.0 μm, more preferably in the range of 1.0 μm to 2.5 μm. When the thickness of the colored layer 30 is large, it may be difficult to adjust the cell gap when manufacturing a liquid crystal display panel. When the film thickness of the colored layer 30 is small, it is necessary to increase the pigment concentration in the colored resist, which increases the viscosity of the resist and makes it difficult to form a uniform pattern.

  The overlapping width between the colored layer 30 and the BM 21b is preferably in the range of 1.0 μm to 7.0 μm. When the overlap width is 1.0 μm or less, since the overlap between the colored layer and the BM is small, a display defect may occur due to a film thickness difference occurring in the central portion of the colored layer 30 and in the vicinity of the BM 21b. In some cases, white spots may occur. When the overlap width is large, the horn steps d1 and d2 are further increased, and liquid crystal alignment defects (disclination, etc.) are generated.

  The film thickness of the colored layer 30 and the BM 21b can be calculated by measuring using a stylus type film thickness meter or the like, and observing the cross-sectional shape of the color filter with a scanning electron microscope (SEM). The measured values of the overlapping width of the layer 30 and the BM 21b and the overlapping width of the adjacent colored layers are measured using an optical microscope with a side-length function or the cross-sectional shape of the color filter is observed with a scanning electron microscope (SEM). And can be calculated.

  Next, a liquid crystal display device using the color filter for a liquid crystal display device of the present invention will be described.

  The liquid crystal display device includes the color filter configured as described above. The color filter is formed with structures such as transparent electrodes and spacers (not shown). Such a color filter is disposed so as to face, for example, a TFT array substrate (not shown) on which TFT elements for driving liquid crystal are disposed. Liquid crystal is filled between the color filter and the TFT array substrate.

The color filter, the liquid crystal, and the TFT array substrate are sandwiched between, for example, a pair of polarizing plates arranged in crossed Nicols, and a liquid crystal display device is configured.
As described above, the liquid crystal display device including the color filter has good display characteristics because it can prevent the liquid crystal alignment failure caused by the discharge portion (horn) of the overlapping portion of the color filter and the BM. In particular, light leakage from an oblique direction can be prevented.

Next, although the Example and comparative example which concern on this invention are described concretely, in the range which does not deviate from the meaning of this invention, it is not limited to this. In addition, since the material used in the present invention is extremely sensitive to light, it is necessary to prevent exposure to unnecessary light such as natural light, and it goes without saying that all operations are performed under a yellow or red light.
The color filters for evaluation 100a to 100h used in Examples 1 to 6 and Comparative Examples 1 and 2 were prepared using photosensitive compositions prepared in the following manner.

Example 1
<Preparation of photosensitive composition for BM formation>
A carbon black dispersion was prepared by mixing and stirring at the following ratio: Carbon black dispersion: TPBK-2016 (manufactured by Mikuni Dye Co., Ltd.) 28.5 parts by weight Resin: V259-ME (manufactured by Nippon Steel Chemical Co., Ltd.) 10 .3 parts by weight Monomer: DPHA (manufactured by Nippon Kayaku Co., Ltd.) 2.58 parts by weight Initiator: OXE-02 (manufactured by Ciba Specialty Chemicals) 0.86 parts by weight Solvent: propylene glycol monomethyl ether acetate 92 0.0 part by weight Ethyl-3-ethoxypropionate 4.3 parts by weight Leveling agent: BYK-330 (manufactured by Big Chemie) 1.3 parts by weight

<BM layer formation>
A coating film was formed on the glass substrate by spin coating the photosensitive composition for BM formation, and after drying at 100 ° C. for 3 minutes, a black photosensitive layer 21 having a thickness of 1.6 μm was produced (FIG. 2A). reference). The black photosensitive layer 21 thus obtained was irradiated with 200 mJ / cm ² of light from a high-pressure mercury lamp through a BM layer forming photomask, developed with a 2.5% aqueous sodium carbonate solution for 30 seconds, washed with water and dried, and then patterned. The substrate was baked at 230 ° C. for 60 minutes to form a BM 21b having a line width of 6 μm at a predetermined position of the substrate 11 (see FIG. 2B).

<Preparation of red photosensitive composition 1>
A mixture having the following composition was uniformly stirred and mixed, then dispersed in a sand mill for 5 hours using glass beads having a diameter of 1 mm, and then filtered through a 5 μm filter to prepare a red pigment dispersion.
-Red pigment: C.I. I. 18 parts by weight of Pigment Red 254 (“Ilgar For Red B-CF” manufactured by Ciba Specialty Chemicals)
-Red pigment: C.I. I. Pigment Red 177 2 parts by weight (Ciba Specialty Chemicals “Chromophthal Red A2B”)
・ 2 parts by weight of dispersant (“Ajisper PB821” manufactured by Ajinomoto Fine Techno Co.) ・ 50 parts by weight of acrylic varnish (solid content 20%)

Thereafter, a mixture having the following composition was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a red photosensitive composition 1.
-72 parts by weight of the dispersion-Resin: 28 parts by weight of a thermoplastic acrylic resin-Monomer: 12 parts by weight of DPHA (manufactured by Nippon Kayaku Co., Ltd.)-Initiator: Irgacure 907 (manufactured by Ciba Specialty Chemicals)
3 parts by weight-Sensitizer: EAB-F (Hodogaya Chemical Co., Ltd.) 1 part by weight-Solvent: 253 parts by weight of cyclohexanone

<Red layer formation>
A coating film was formed on the glass substrate 11 on which the BM 21b was formed by spin coating the red photosensitive composition 1, and after drying at 90 ° C. for 5 minutes, a red photosensitive layer 31 having a thickness of 3.2 μm was produced ( (Refer FIG.2 (c)). The obtained red photosensitive layer 31 was irradiated with 300 mJ / cm ² of light from a high-pressure mercury lamp through a striped photomask for forming a red layer, developed with an alkaline developer for 60 seconds, washed with water and dried, and then patterned. In order to fix, baking was performed at 230 ° C. for 30 minutes to form a red layer 31R having a stripe shape (see FIG. 2D).
An alkaline developer having the following composition was used.
・ 1.5 parts by weight of sodium carbonate, 0.5 part by weight of sodium hydrogencarbonate, 8.0 parts by weight of anionic surfactant (Kao / Perylex NBL), 90 parts by weight of water

<Adjustment of green photosensitive composition 1>
A mixture having the following composition was uniformly stirred and mixed, then dispersed in a sand mill for 5 hours using a glass bead having a diameter of 1 mm, and then filtered through a 5 μm filter to prepare a green pigment dispersion.
Green pigment: C.I. I. Pigment Green 36
(“Rionol Green 6YK” manufactured by Toyo Ink Co., Ltd.) 16 parts by weight / yellow pigment: C.I. I. Pigment Yellow 150
(Bayer's "Funcheon First Yellow Y-5688") 8 parts by weight Dispersant (Big Chemie "Disperbyk-163") 2 parts by weight Acrylic varnish (solid content 20%) 102 parts by weight

Thereafter, a mixture having the following composition was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a green photosensitive composition 1.
-128 parts by weight of the dispersion-Resin: 29 parts by weight of thermoplastic acrylic resin-Monomer: 14 parts by weight of DPHA (manufactured by Nippon Kayaku Co., Ltd.)-Initiator: Irgacure 907 (manufactured by Ciba Specialty Chemicals)
4 parts by weight-Sensitizer: EAB-F (Hodogaya Chemical Co., Ltd.) 2 parts by weight-Solvent: 257 parts by weight of cyclohexanone

<Green layer formation>
A coating film is formed by spin coating the green photosensitive composition 1 on the glass substrate 11 on which the BM 21b and the red layer 31R are formed, dried at 90 ° C. for 5 minutes, and then a green photosensitive layer 32 having a thickness of 3.2 μm. (Not shown in particular). The green photosensitive layer 32 thus obtained was irradiated with 300 mJ / cm ² of light from a high-pressure mercury lamp through a stripe-shaped photomask for forming a green layer, developed with an alkali developer for 60 seconds, washed with water, dried, and then patterned. In order to fix, baking was performed at 230 ° C. for 30 minutes to form a stripe-shaped green layer 32G (see FIG. 2E).
The alkaline developer having the same composition as the red layer was used.

<Preparation of blue photosensitive composition 1>
A mixture having the following composition was uniformly stirred and mixed, then dispersed in a sand mill for 5 hours using glass beads having a diameter of 1 mm, and then filtered through a 5 μm filter to prepare a blue pigment dispersion.
Blue pigment: C.I. I. Pigment Blue 15: 6
("Rionol Blue ES" manufactured by Toyo Ink Manufacturing Co., Ltd.) 3.6 parts by weight. Dispersant ("Sols Birds 20000" manufactured by Zeneca) 0.6 parts by weight. Acrylic varnish (solid content 20%) 22.1 parts by weight Part

Then, after stirring and mixing the mixture of the following composition so that it might become uniform, it filtered with a 5 micrometers filter, and obtained the blue photosensitive composition 1.
-28.3 parts by weight of the dispersion-Resin: 9.4 parts by weight of a thermoplastic acrylic resin-Monomer: 4.7 parts by weight of DPHA (manufactured by Nippon Kayaku Co., Ltd.)-Initiator: Irgacure 907 (Ciba Specialty Chemicals) Made)
1.4 parts by weight / sensitizer: EAB-F (manufactured by Hodogaya Chemical Co., Ltd.) 0.2 parts by weight / solvent: 26 parts by weight cyclohexanone 11 parts by weight 2-acetoxy-1-methoxypropane 20 parts by weight isopentyl acetate

<Blue layer formation>
A coating film is formed by spin coating the blue photosensitive composition 1 on the glass substrate 11 on which the BM21b red layer 31R and the green layer 31G are formed, and dried at 90 ° C. for 5 minutes.
A 2 μm blue photosensitive layer 33 was prepared (not shown in particular). The resulting blue photosensitive layer 33 is irradiated with 300 mJ / cm ² of light from a high-pressure mercury lamp through a striped photomask for forming a blue layer, developed with an alkali developer for 60 seconds, washed with water and dried, and then patterned. By baking at 230 ° C. for 30 minutes for fixing, a stripe-shaped blue layer 33B was formed (see FIG. 2F). The alkaline developer having the same composition as the red layer was used.

  Through the above steps, the color filter 100a for the liquid crystal display device of Example 1 in which the colored layer 30 composed of the BM 21b, the red layer 31R, the green layer 32G, and the blue layer 33B was formed on the substrate 11 was obtained (FIG. 2 ( f)).

(Example 2)
Photosensitivity similar to that in Example 1 except that in the formation process of each colored layer 30, the exposure alignment position is changed, and the width of each colored layer 30 on BM 21 b and the overlapping width of adjacent colored layers are adjusted. Using the composition, the color filter 100b for a liquid crystal display device of Example 2 was obtained in the same steps and conditions (see FIG. 2 (f)).

(Example 3)
<BM layer formation>
The same BM forming photosensitive composition as in Example 1 was used, and BM21b was formed at a predetermined position of the substrate 11 by the same process and conditions (see FIG. 2B).

<Adjustment of red photosensitive composition 2>
A mixture having the following composition was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a red photosensitive composition 2.
-65 parts by weight of dispersion similar to Example 1-Resin: 31 parts by weight of thermoplastic acrylic resin-Monomer: 10 parts by weight of DPHA (manufactured by Nippon Kayaku Co., Ltd.)-Initiator: Irgacure 907 (manufactured by Ciba Specialty Chemicals) )
3 parts by weight-sensitizer: EAB-F (Hodogaya Chemical Co., Ltd.) 1 part by weight-solvent: 247 parts by weight of cyclohexanone

<Red layer formation>
A stripe-shaped red layer 31R was formed on the glass substrate 11 on which the BM 21b was formed in the same process as in Example 1 (see FIG. 2D).

<Adjustment of green photosensitive composition 2>
A mixture having the following composition was stirred and mixed to be uniform, and then filtered through a 5 μm filter to obtain a green photosensitive composition 2.
-103 parts by weight of the same dispersion as in Example 1-Resin: 38 parts by weight of thermoplastic acrylic resin-Monomer: 11 parts by weight of DPHA (manufactured by Nippon Kayaku Co., Ltd.)-Initiator: Irgacure 907 (manufactured by Ciba Specialty Chemicals) )
4 parts by weight-Sensitizer: EAB-F (Hodogaya Chemical Co., Ltd.) 2 parts by weight-Solvent: 218 parts by weight of cyclohexanone

<Green layer formation>
A stripe-shaped green layer 32G was formed on the glass substrate 11 on which the BM 21b and the red layer 31R were formed in the same process as in Example 1 (see FIG. 2 (e)).

<Preparation of blue photosensitive composition 2>
A mixture having the following composition was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a blue photosensitive composition 2.
-Dispersion similar to Example 1 22.1 parts by weight-Resin: 12.7 parts by weight of a thermoplastic acrylic resin-Monomer: DPHA (manufactured by Nippon Kayaku Co., Ltd.) 3.5 parts by weight-Initiator: Irgacure 907 (Ciba・ Specialty Chemicals)
1.6 parts by weight-sensitizer: EAB-F (manufactured by Hodogaya Chemical Co., Ltd.) 0.2 parts by weight-solvent: 26 parts by weight cyclohexanone 11 parts by weight 2-acetoxy-1-methoxypropane 20 parts by weight isopentyl acetate

<Blue layer formation>
A stripe-shaped blue layer 33B was formed on the glass substrate 11 on which the BM21b red layer 31R and the green layer 31G were formed in the same process as in Example 1 (see FIG. 2 (f)).

  Through the above steps, the color filter 100c for the liquid crystal display device of Example 3 in which the colored layer 30 composed of the BM 21b, the red layer 31R, the green layer 32G, and the blue layer 33B was formed on the substrate 11 was obtained (FIG. 2 ( f)).

Example 4
Photosensitivity similar to that in Example 3 except that in the step of forming each colored layer 30, the exposure alignment position was changed, and the width of each colored layer 30 on BM21b and the overlapping width of adjacent colored layers were adjusted. Using the composition, the color filter 100d for a liquid crystal display device of Example 4 was obtained in the same steps and conditions (see FIG. 2 (f)).

(Example 5)
In the formation process of each colored layer 30, except that the green layer was produced using the green photosensitive composition 2, the same photosensitive composition as in Example 1 was used, and the same process and conditions were performed in Example 5. A color filter 100e for a liquid crystal display device was obtained (see FIG. 2F).

(Example 6)
In the formation process of each colored layer 30, except that the green layer was produced using the green photosensitive composition 1, the same photosensitive composition as in Example 3 was used, and the same process and conditions were performed in Example 6. A color filter 100f for a liquid crystal display device was obtained (see FIG. 2F).

(Comparative Example 1)
Photosensitivity similar to that in Example 1 except that in the formation process of each colored layer 30, the exposure alignment position is changed, and the width of each colored layer 30 on BM 21 b and the overlapping width of adjacent colored layers are adjusted. Using the composition, the color filter 100g for a liquid crystal display device of Comparative Example 1 was obtained in the same steps and conditions (see FIG. 2 (f)).

(Comparative Example 2)
<BM layer formation>
The same BM forming photosensitive composition as in Example 1 was used, and BM21b was formed at a predetermined position of the substrate 11 by the same process and conditions (see FIG. 2B).

<Adjustment of red photosensitive composition 3>
A mixture having the following composition was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a red photosensitive composition 3.
-Dispersion similar to Example 1 72 parts by weight Resin: 14 parts by weight of thermoplastic acrylic resin 14 parts by weight of photosensitive (meth) acryloyl resin-Monomer: DPHA (manufactured by Nippon Kayaku Co., Ltd.) 12 parts by weight-Initiator : Irgacure 907 (Ciba Specialty Chemicals)
3 parts by weight-Sensitizer: EAB-F (Hodogaya Chemical Co., Ltd.) 1 part by weight-Solvent: 253 parts by weight of cyclohexanone

<Red layer formation>
A stripe-shaped red layer 31R was formed on the glass substrate 11 on which the BM 21b was formed in the same process as in Example 1 (see FIG. 2D).
<Adjustment of green photosensitive composition 3>
A mixture having the following composition was stirred and mixed to be uniform, and then filtered through a 5 μm filter to obtain a green photosensitive composition 3.
-Dispersion similar to Example 1 128 parts by weight Resin: Thermoplastic acrylic resin 15 parts by weight Photosensitive (meth) acryloyl resin 14 parts by weight-Monomer: DPHA (manufactured by Nippon Kayaku Co., Ltd.) 14 parts by weight-Initiator : Irgacure 907 (Ciba Specialty Chemicals)
4 parts by weight-Sensitizer: EAB-F (Hodogaya Chemical Co., Ltd.) 2 parts by weight-Solvent: 257 parts by weight of cyclohexanone

<Green layer formation>
A stripe-shaped green layer 32G was formed on the glass substrate 11 on which the BM 21b and the red layer 31R were formed in the same process as in Example 1 (see FIG. 2 (e)).

<Preparation of blue photosensitive composition 3>
A mixture having the following composition was stirred and mixed to be uniform, and then filtered through a 5 μm filter to obtain a blue photosensitive composition 3.
-Dispersion similar to Example 1 28.3 parts by weight Resin: thermoplastic acrylic resin 4.8 parts by weight Photosensitive (meth) acryloyl resin 4.6 parts by weight-Monomer: DPHA (manufactured by Nippon Kayaku Co., Ltd.) 4.7 parts by weight / initiator: Irgacure 907 (manufactured by Ciba Specialty Chemicals)
1.4 parts by weight / sensitizer: EAB-F (manufactured by Hodogaya Chemical Co., Ltd.) 0.2 parts by weight / solvent: 26 parts by weight cyclohexanone 11 parts by weight 2-acetoxy-1-methoxypropane 20 parts by weight isopentyl acetate

  Through the above steps, a color filter 100h for a liquid crystal display device of Comparative Example 2 was obtained in which the colored layer 30 composed of the BM 21b, the red layer 31R, the green layer 32G, and the blue layer 33B was formed on the substrate 11 (FIG. 2 ( f)).

(Comparative Example 3)
In the formation process of each colored layer 30, except that the finished film thickness was changed, the same photosensitive composition as in Example 1 was used, and in the same process and conditions, the color filter for liquid crystal display device 100g of Comparative Example 1 was used. Was obtained (see FIG. 2 (f)).

  Through the above steps, a color filter 100h for a liquid crystal display device of Comparative Example 2 was obtained in which the colored layer 30 composed of the BM 21b, the red layer 31R, the green layer 32G, and the blue layer 33B was formed on the substrate 11 (FIG. 2 ( f)).

A scanning electron microscope (manufactured by Hitachi Electronics Co., Ltd.) was used to measure the width of each colored layer 30 on the liquid crystal display device color filter BM21b obtained in Examples 1 to 6 and Comparative Examples 1 and 2, and the overlapping width of adjacent colored layers. S-4500), the pixel at the midpoint of the BM21b film thickness H, the color layer 30 (for example, 32G) that has been previously colored, the film thickness T1 at the center, the leading edge of the BM21b, and the BM21b edge on the colored layer riding side Film thickness T2, film thickness T3 at the center of the colored layer 30 (for example, 33B) that has been added later, pixel film thickness T4 at the midpoint of the tip of the BM 21b and the tip of the colored layer ride side BM 21b, horn steps d1, d2 Were evaluated with a stylus type film thickness meter (manufactured by Kosaka Lab Inc .: ET4000).
Table 1 shows the evaluation result of the red colored layer-green colored layer interface, Table 2 shows the evaluation result of the green colored layer-blue colored layer interface, and Table 3 shows the evaluation result of the blue colored layer-red colored layer interface.
If the running width of each colored layer 30 on the BM 21b is less than 1.0 μm, a display defect may occur due to a difference in film thickness between the central portion of the colored layer 30 and the vicinity of the BM 21b. The color filter for each liquid crystal display device is produced so that

From the above results, it was confirmed that the color filters for liquid crystal display devices of the present invention obtained in Examples 1 to 6 had excellent flatness that did not require polishing or OC application step.
Further, Comparative Example 1 in which the width on the BM 21b exceeds 5.0 μm and the overlapping width of the colored layers exceeds 4.0 μm, and Comparative Example 2 that does not satisfy Expression (1) and Expression (2), Expression ( 3) In Comparative Example 3 that does not satisfy Expression (4), the flatness of the entire color filter is impaired.

  The display quality of the liquid crystal display devices manufactured using the color filters obtained in Examples 1 to 6 was good without display defects due to tilting of liquid crystal molecules and light leakage around the pixels.

11 ... Substrate 21 ... Black photosensitive layer 21b ... BM
30 ... Colored layer 31R ... Red layer 32G ... Green layer 33B ... Blue layer 100 ... Color filter for liquid crystal display device

Claims (5)

A color filter for a liquid crystal display device, comprising: a transparent substrate; a light shielding portion that defines a pixel region formed on the transparent substrate; and a colored layer disposed in the pixel region,
The width of the colored layer running on the light shielding part is in the range of 1.0 μm or more and 5.0 or less,
The overlapping width between adjacent colored layer end portions is 4.0 μm or less,
A color filter for a liquid crystal display device, characterized in that the colored layer runs on the light shielding portion and the height of the colored layer protrusion generated by the overlap is less than 0.3 μm on the basis of the colored layer. 2. A color filter for a liquid crystal display device according to claim 1, wherein the thickness of the central portion of the colored layer previously colored is T1, the tip of the colored layer riding on the light shielding portion, and the tip of the light shielding portion on the side where the previous colored layer rides. When the thickness of the colored layer at the point is T2,
T2 / T1 <0.5 (Formula 1)
The color filter for liquid crystal display devices characterized by satisfying the above conditions. 2. The color filter for a liquid crystal display device according to claim 1, wherein the thickness of the central portion of the colored layer that has been added later is T3, the middle point of the colored layer that has run on the light shielding portion, and the middle point of the light shielding portion on the side on which the colored layer has been placed. When the thickness of the colored layer is T4,
T4 / T3 <0.5 (Formula 2)
The color filter for liquid crystal display devices characterized by satisfying the above conditions. When the light shielding part film thickness is H,
T1 / H ≧ 1.6 (Equation 3)
T3 / H ≧ 1.6 (Formula 4)
The color filter for a liquid crystal display device according to claim 1, wherein the condition is satisfied.   5. A color liquid crystal display device using the color filter for a liquid crystal display device according to any one of claims 1 to 4.

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