JP5532844B2 - Color filter substrate and liquid crystal display device - Google Patents

Description

  The present invention relates to a color filter substrate for a liquid crystal display device and a liquid crystal display device, and more particularly to a color filter substrate for a liquid crystal display device that requires high image quality such as a large TV or a monitor.

  In recent years, there has been a demand for further higher image quality, lower cost, and lower power consumption in thin display devices such as liquid crystal displays. In color filters for liquid crystal display devices, electrical characteristics such as sufficient color purity, high contrast, flatness, and low dielectric constant that are unlikely to hinder liquid crystal driving have been required.

  In high-quality liquid crystal displays, liquid crystal drive systems such as IPS (In-Plane Switching), VA (Vertical Aligned), HAN (Hybrid Aligned Nematic), FFS (Fringe Field Switching), OCB (Optically Compensated Bend) have been proposed and widely used. A display with a viewing angle and a fast response has been put into practical use.

  In liquid crystal display devices such as the IPS system in which the liquid crystal is aligned in parallel with the substrate surface, such as glass, the VA that is easy to support high-speed response, and the FFS system that is effective for a wide viewing angle, the flatness (thickness of the film thickness) And the electrical characteristics such as the dielectric constant) and the electrical characteristics such as the dielectric constant on the surface of the color filter are becoming higher level requirements. In these high-quality liquid crystal displays, a technique for reducing the thickness of the liquid crystal cell (the thickness of the liquid crystal layer) has become a major issue in order to reduce coloring when viewed in an oblique direction and further increase the response speed.

  In order to reduce coloration when viewed in an oblique direction, there is a technique in which a colored layer is overlapped and used as a spacer in order to equalize the thickness of a liquid crystal cell in combination with flattening of a color filter (for example, Patent Documents 1 and 2). Forming the spacer by a photolithography technique using a colored layer or the like is excellent from the viewpoint of securing a uniform liquid crystal cell gap.

  Further, Japanese Patent Application Laid-Open No. 2004-228688 discloses a technique that uses a superimposed portion of display colored pixels as a black matrix for the purpose of improving contrast in front view and for the purpose of reducing the cost of a color filter. Techniques for providing a frame-shaped light shielding layer on the outer periphery of the display area of the liquid crystal display screen are disclosed in Patent Documents 4 and 5.

JP-A-63-82405 JP-A-9-49914 JP 2003-14917 A JP-A-10-170958 JP 2008-203545 A

   A technique for forming a black matrix by color superposition (Patent Document 3), a technique for superimposing a black matrix and colored pixels in a display area (Patent Document 4), and a technique for simply using color superposition as a spacer (Patent Document 1) Is a projection in which the film thickness of the colored pixel end portion protrudes as it is in the color overlap portion, which is not preferable from the viewpoint of liquid crystal alignment. For example, the thickness of the colored pixel of the color filter is usually about 1.5 μm or more and about 3 μm or less, and in liquid crystal display devices such as IPS and VA that require high image quality, the high protrusions hinder liquid crystal alignment. These techniques (including Patent Document 2) for disposing a black matrix using a light-shielding material do not consider the thickness of the black matrix and the colored pixels from the viewpoint of flatness, and require a high image quality. Difficult to apply to.

  The technique described in Patent Document 5 can be said to be a preferable technique from the viewpoint of planarization. However, spacer technology for making the liquid crystal cell gap uniform has not been studied. In this case, the light shielding layer (frame portion) and the black matrix are formed in two steps, and the cost is low including the formation of the spacer. Insufficient consideration is required. In this technique, the material of the light shielding layer and the black matrix has not been studied in terms of electrical characteristics.

  Accordingly, an object of the present invention is to solve the above-described problems, and to provide a color filter substrate that is excellent in flatness and can be formed with high accuracy with few steps, and a liquid crystal display device including the color filter substrate. .

  In Paragraph 0023 of Patent Document 2, carbon black (hereinafter abbreviated as carbon) is excellent in terms of light shielding properties and is particularly preferable. However, carbon is a colorant having a high dielectric constant, and is an FFS method or IPS method. It is not suitable for a liquid crystal display device. When carbon is used as the main coloring material (100% to 90% with respect to the total amount of pigment (weight ratio)), the relative permittivity of the light shielding layer and black matrix formed thereby is approximately 7 to 15, The color filter constituent member is not suitable for driving an IPS liquid crystal. The relative dielectric constant of a liquid crystal material driven by an active element such as a TFT is about 7 to 40 in the molecular direction where the relative dielectric constant is large. As a constituent member of a color filter for an FFS mode or IPS mode liquid crystal display device, the relative dielectric constant thereof is 5 or less, preferably 4.5 or less. In a liquid crystal display device such as an FFS method or an IPS method, an arch-shaped electric field line formed between a comb-like pixel electrode and a common electrode has a conventional light-shielding layer containing a high dielectric constant color material such as carbon. The deformation was caused by the black matrix, which hindered the uniform response of the liquid crystal layer.

  Accordingly, an object of the present invention is to provide a color filter substrate for a high-quality liquid crystal display device and a liquid crystal display device in consideration of electrical characteristics such as relative permittivity.

In order to solve the above-mentioned problem, the first aspect of the present invention includes a light-shielding layer having an organic pigment as a main color material disposed on the outer periphery of an effective display area on a transparent substrate, and comprises a colored layer of three or more colors. In a color filter substrate in which colored pixels are formed in the effective display area, the film is made of the same material as the light-shielding layer and is thinner than the light-shielding layer and has a thickness of 0.4 μm or more and 1.0 μm or less formed in the effective display area. And a spacer formed by stacking a plurality of colored layers formed on the pedestal . The light-shielding layer includes C.I. I. Pigment red 254, C.I. I. Pigment red 177, C.I. I. Pigment yellow 150, C.I. I. Pigment Blue 15: made by using the black composition obtained from a mixture of 6, one of the colored layer is a green colored layer to the halogenated zinc phthalocyanine as a main coloring material, the light-shielding layer and the colored layer A color filter substrate characterized in that the thickness of the liquid crystal layer when the liquid crystal display device is configured is equal , and the height of the portion of the spacer formed on the pedestal protruding on the colored pixel is equal. provide.

  Further, a black matrix made of the same material as the light shielding layer and having a thickness smaller than that of the light shielding layer can be disposed in the effective display area.

  Furthermore, the adjacent portions of the colored pixels can be overlapped with the inclined portions of the end portions of the respective colored pixels.

  Furthermore, the inclination angle of the end of the colored pixel with respect to the transparent substrate surface can be set to 15 ° or more and 40 ° or less.

  In the effective display area, the height of the protrusion formed on the colored pixel overlapping portion can be 0.25 μm or less.

  Furthermore, in the effective display area, a spacer that also serves as a liquid crystal alignment control structure can be disposed in the center in the longitudinal direction of the colored pixel.

  According to a second aspect of the present invention, there is provided a liquid crystal display device comprising the color filter substrate described above.

  According to the present invention, there are provided a color filter substrate that is excellent in flatness and can be accurately formed with few steps, and a liquid crystal display device including the color filter substrate. In addition, according to the present invention, a color filter substrate for a high-quality liquid crystal display device and a liquid crystal display device in consideration of electrical characteristics such as relative permittivity are provided.

It is sectional drawing which shows the color filter board | substrate which concerns on one Embodiment of this invention. It is a figure which expands and shows the part enclosed with the circle of the broken line of the color filter board | substrate shown in FIG. It is a figure which shows the planar arrangement | positioning of the light shielding layer, a base, and a spacer in the color filter substrate which concerns on one Embodiment of this invention. It is a characteristic view which shows the relationship between the film thickness of a base, and the film thickness of the colored layer on a base. It is a characteristic view showing the relationship between the film thickness of the black matrix and the height of the protrusion of the colored pixel end portion superimposed on the black matrix. It is a figure which shows the planar view arrangement | positioning of the light shielding layer, a base, a black matrix, and a spacer in the color filter substrate which concerns on other embodiment of this invention. It is sectional drawing which shows the shape and inclination | tilt angle of the pattern edge of the colored pixel of a thick film thickness. It is sectional drawing which shows the shape and inclination | tilt angle of the pattern edge of the colored pixel of a thin film thickness. It is sectional drawing of the liquid crystal display device provided with the color filter substrate shown in FIG.

  Hereinafter, embodiments of the present invention will be described.

  Before describing embodiments of the present invention, the meanings of terms used in this specification will be described.

  In the present specification, the light shielding layer and the frame portion are synonymous and mean a frame-shaped light shielding pattern on the outer periphery of the effective display area. The black matrix refers to a grid-like light shielding pattern in the display area. The spacer is a member for maintaining the cell thickness (the thickness of the liquid crystal layer) of the liquid crystal display device targeted by the present invention. Therefore, the height of the spacer is substantially the same as the thickness of the liquid crystal layer.

  Usually, a liquid crystal display panel is obtained by bonding a color filter substrate and a TFT substrate on which an active element for driving liquid crystal is formed facing each other so as to sandwich a liquid crystal layer. Therefore, the height of the spacer must include the margin at this time. The height of the spacer is the height from the top of the spacer to the surface of the colored pixel at the center between adjacent pixels.

   A colored pixel is formed by applying a photosensitive coloring composition on a transparent substrate to form a colored layer, and patterning the colored layer by a known photolithography technique. The film thickness of the colored pixel refers to the height from the surface of the transparent substrate to the center surface of each pixel. The height of the overlapping portion (hereinafter referred to as a protrusion) of adjacent colored pixels is the height from the top of the protrusion to the surface of the colored pixel at the center of the pixel. The colored pixels of a plurality of colors are blue pixels, red pixels, green pixels, yellow pixels, white pixels (transparent pixels), and the like.

   In the present invention, a configuration of a plurality of colored pixels including a light shielding layer is referred to as a color filter, and a color filter formed on a transparent substrate such as glass is referred to as a color filter substrate. The colored layers stacked as spacers are referred to as a red stacked portion, a green stacked portion, and a blue stacked portion, respectively. In the present invention, the substantially same film thickness means that the film thickness difference can be controlled by the manufacturing process in the formation of the light shielding layer and the colored layer, for example, ± 0.2 μm with respect to the set film thickness, or ± The case where it exists in the range of 0.15 micrometers is said.

   The relative dielectric constant referred to in the present specification is premised on measurement at a frequency of 50 Hz to 500 Hz used for liquid crystal driving at room temperature.

  FIG. 1 is a cross-sectional view showing a color filter substrate according to an embodiment of the present invention.

  In the color filter substrate shown in FIG. 1, a light shielding layer 2 mainly composed of an organic pigment is provided in a frame portion on the outer periphery of the display area on the transparent substrate 1, and a red pixel 3R, a green pixel 3G, and a blue pixel 3B are provided in the display area. Each of the three colored pixels is formed. The thickness of the light shielding layer 2 and the thickness of the colored pixels are substantially the same. A pedestal 4 made of the same material as the light shielding layer 2 is formed on the transparent substrate 1 at the boundary between the red pixel 3R and the green pixel 3G. On the pedestal 4, a red laminated portion 5R, a green laminated portion 5G, and A spacer 5 made of a stack of blue stacked portions 5B is formed. On the transparent substrate 1 at the boundary between the green pixel 3G and the blue pixel 3B, a pedestal 4 'made of the same material as that of the light shielding layer 2 is formed without the spacer 5. On the light shielding layer 2, for example, a sub-spacer 6 having a two-layer structure, which is lower in height than the spacer 5 having a three-layer structure, is disposed.

  The pedestal 4 is thinner than the light shielding layer 2 and has a film thickness of 0.4 μm or more and 1.0 μm or less. When the film thickness of the pedestal 4 is less than 0.4 μm, it is difficult to obtain a stable film thickness when the pedestal 4 is formed by photolithography. On the other hand, when the thickness exceeds 1.0 μm, the thickness of the laminated portion laminated thereon becomes thin, a sudden change in film thickness occurs between the pixels, and the laminated portion becomes unstable.

  A TFT substrate is disposed opposite to the color filter substrate configured as described above, and a liquid crystal display device is configured by interposing a liquid crystal layer between the color filter substrate and the TFT substrate. The thickness and the height of the spacer formed on the pedestal are substantially equal. The height h of the spacer 5 is the thickness of the portion protruding from the surface of the colored pixels 3R, 3G, 3B in the stack of the red stacked portion 5R, the green stacked portion 5G, and the blue stacked portion 5B.

  FIG. 2 is an enlarged view of a portion surrounded by a broken-line circle of the color filter substrate shown in FIG. A portion surrounded by a broken-line circle is an overlapping portion of the blue pixel 3B and the green pixel 3G. The overlapping portion is a protrusion 7 protruding from the surface of the pixel. If the height d of the protrusion 7 is too high, the flatness of the pixel is impaired. Therefore, it is desirable that the overlapping portion be 0.25 μm or less. .

  FIG. 3 is a diagram showing a planar arrangement of the light shielding layer 2, the pedestals 4, 4 ′, and the spacers 5 in the color filter substrate. The A-A ′ cross section in FIG. 3 corresponds to FIG. 1. The pedestal 4 ′ not formed with the spacer 5 is disposed for the purpose of adjusting the aperture ratio of the red pixel 3 </ b> R, the green pixel 3 </ b> G, and the blue pixel 3 </ b> B and shielding light from active elements such as TFTs. Further, as shown in FIG. 1, for example, a sub-spacer 6 having a two-layer structure having a height lower than that of the spacer 5 having a three-layer structure is disposed in the frame portion.

   In the color filter substrate according to an embodiment of the present invention described above, the use of carbon having a high relative dielectric constant can be avoided as much as possible by using an organic pigment having a low relative dielectric constant as the main colorant of the light shielding layer. Further, the flatness can be improved by making the thickness of the light shielding layer substantially the same as that of the colored pixels. As a result, a color filter substrate and a liquid crystal display device that are optimal for high-quality liquid crystal display can be obtained.

   In addition, since a pedestal with a film thickness thinner than that of the light-shielding layer is provided in advance on the part where the spacer is formed, fine adjustment of the spacer and suppression of photocurrent generation in active elements such as TFTs due to incident light are suppressed. can do. Since the pedestal is disposed with a thin film thickness that does not easily affect the flatness, that is, a film thickness of 0.4 μm or more and 1.0 μm or less, the flatness optimal for high-quality liquid crystal display is not impaired.

   In particular, by making the thickness of the light-shielding layer and the thickness of the colored layer substantially the same, and overlapping at the inclined portions of the respective colored pixel ends, the occurrence of protrusions at the overlapping portions is eliminated, and high flatness is ensured. be able to.

   In addition, in the color filter substrate according to the present embodiment, since there is no film thickness difference between the light shielding layer (frame portion) and the colored pixels as the display region, the color filter substrate is caused by the film thickness difference at the boundary portion between the display region and the frame portion. There is no alignment disorder of the liquid crystal, and light leakage caused by the alignment disorder can be eliminated.

   As described above, since the light shielding layer and the pedestal use carbon having a high relative dielectric constant as much as possible, the liquid crystal is not affected by the electric field from the pixel electrode driven by an active element such as a TFT. The orientation is not disturbed.

   In the color filter substrate according to the present embodiment, zinc halide phthalocyanine having a dielectric constant smaller than that of a halogenated copper phthalocyanine generally used as a green pixel or a green colored layer is used as the main green organic pigment, so that the visibility is high. A color filter suitable for green display can be obtained.

  As described above, according to the present invention, it is possible to provide a color filter substrate suitable for a large-sized TV or a high-quality monitor at a low cost, for example, only by four photolithography processes while having high quality. .

  Next, materials constituting the light shielding layer 2, the red pixel 3R, the green pixel 3G, the blue pixel 3B, the pedestal 4, and the spacer 5 of the color filter substrate having the above configuration will be described.

  First, organic pigments that can be used for the light shielding layer 2, the red pixel 3R, the green pixel 3G, the blue pixel 3B, the base 4, and the spacer 5 are listed below. The organic pigment to be contained in the light shielding layer is a mixture of various organic pigments, but the green pigment described below may be omitted, and the relative dielectric constant of the light shielding layer is not increased (for example, relative dielectric constant 5 In the following, carbon may be added. The carbon that can be added is more preferably carbon particles subjected to resin coating or surface treatment in order to lower the relative dielectric constant. The carbon that can be added is preferably 10% by weight or less, and more preferably 5% by weight or less, based on the total amount of the pigment. The amount of the organic pigment shown below is preferably 90% by weight or more based on the total amount of the pigment.

(Organic pigment)
Examples of red pigments include C.I. I. Pigment Red 7, 9, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 81: 1, 81: 2, 81: 3, 97, 122, 123, 146, 149, 168, 177, 178, 179, 180, 184, 185, 187, 192, 200, 202, 208, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 246, 254, 255, H.264, 272, 279, etc. can be used.

  Examples of yellow pigments include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 20, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 86, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 125, 126, 127, 128, 129, 137, 138, 139, 144, 146, 147, 148, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 1 73, 174, 175, 176, 177, 179, 180, 181, 182, 185, 187, 188, 193, 194, 199, 213, 214 and the like.

  Examples of blue pigments include C.I. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 60, 64, 80, etc., preferably C.I. I. Pigment Blue 15: 6 can be used.

  Purple pigments include C.I. I. Pigment Violet 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, 50 and the like, preferably C.I. I. Pigment Violet 23 can be used in combination.

  Examples of the green pigment include C.I. I. Pigment Green 1, 2, 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 26, 36, 45, 48, 50, 51, 54, 55, 58 and the like. Among the pigments contained in the green colored layer, C.I. I. Pigment Green 58 is preferred.

  Hereinafter, C.I. I. In the description of the pigment pigment of Pigment, it may be simply abbreviated as PB (Pigment Blue), PV (Pigment Violet), PR (Pigment Red), PY (Pigment Yellow), PG (Pigment Green), or the like.

  The above-mentioned PG58 is a halogenated zinc phthalocyanine, and its production example is shown in [Pigment production example G2] described later. PG58 has a dielectric constant smaller than the halogenated copper phthalocyanine which is PG36, and thereby, a green pixel with high brightness can be formed. PG58 and PG36 are organic pigments with almost the same chemical structure except for the difference between zinc and copper as central metals. However, PG58 tends to be smaller in electrical characteristics, including variations in dielectric constant. is there.

  According to the findings of the present inventors, the reason why PG58 is suitable for the present invention despite the similar chemical structure is from the optical measurement shown below (measurement of birefringence Δn of green pigment). It can be demonstrated. In addition, the one where the solid content ratio of organic pigments, such as a zinc halide phthalocyanine in a coloring composition, has a tendency for the dielectric constant to fall is preferable. In order to reduce the stray capacitance caused by the color filter that causes trouble in driving the liquid crystal, it is preferable to decrease the pigment ratio and increase the resin ratio. Therefore, it can be said that it is preferable to increase the thickness of the light shielding layer and the colored pixels.

[Measurement of birefringence Δn of green pigment]
As is well known, the value of the dielectric constant is approximately equal to the square of the refractive index. In other words, the dielectric constant resulting from electronic polarization is proportional to the square of the refractive index.

  From this point of view, the present inventors clarified the difference in polarization between PG58 and PG36 by measuring the respective refractive indexes Nx, Ny, and Nz on the X axis, Y axis, and Z axis in the orthogonal coordinate system. In order to make the measurement sample have a structure close to the green coloring layer actually used, a pigment dispersion (for example, GP-4) shown in Table 4 below was applied to a film thickness of 1 μm on a glass substrate and dried at 230 ° C. A thing was used.

  The main pigment G2 of the pigment dispersion of GP-4 shown in Table 3 below is PG58. A pigment dispersion in which the first pigment G2 of GP-4 is replaced with PG36 is denoted as GP-5. For the measurement, a spectroscopic ellipsometer M-220 (manufactured by JASCO Corporation) was used to measure Nx, Ny, and Nz, and Δn was calculated according to the following formula. The measurement wavelength was 550 nm.

Δn = {(Nx + Ny) / 2} −Nz
From Table 1 below, it can be understood that the coating of the green pigment dispersion GP-4 containing zinc halide phthalocyanine (PG58) as the main pigment has a smaller Δn absolute value and smaller polarization.

(Manufacture of organic pigment dispersion)
Various methods can be adopted as a method for producing the organic pigment dispersion, and examples thereof are shown below.

  First, pigments, solvents, pigment dispersants (including dye derivatives) and / or dispersion aids, surfactants, and in some cases, polymers and monomers are weighed in predetermined amounts, and subjected to a dispersion treatment step to disperse the pigments. A pigment dispersion is obtained. In this dispersion treatment step, for example, a paint conditioner, a bead mill, a ball mill, a roll mill, a stone mill, a jet mill, a homogenizer, or the like can be used. By carrying out this dispersion treatment, the pigment is made fine, so that the coating characteristics of the photosensitive resin composition using this pigment dispersion are improved.

  When dispersing the pigment, an alkali-soluble resin, a pigment derivative, or the like may be used in combination as appropriate. For example, when the dispersion treatment is performed using a bead mill, it is preferable to use glass beads or zirconia beads having a diameter of 0.1 mm to several mm. The temperature during the dispersion treatment is usually 0 ° C. or higher, preferably room temperature or higher, and is usually set to 100 ° C. or lower, preferably 80 ° C. or lower. The dispersion time varies depending on the composition of the pigment dispersion (pigment, solvent, dispersant, etc.) and the size of the apparatus such as the bead mill.

(Dispersant / dispersant aid)
A polymer dispersant is preferably used as the pigment dispersant because it is excellent in dispersion stability over time. Examples of the polymer dispersant include a urethane dispersant, a polyethyleneimine dispersant, a polyoxyethylene alkyl ether dispersant, a polyoxyethylene glycol diester dispersant, a sorbitan aliphatic ester dispersant, and an aliphatic modified polyester. And the like, and the like. Among these, a dispersant composed of a graft copolymer containing a nitrogen atom is particularly preferable from the viewpoint of developability as the light-shielding photosensitive resin composition of the present invention containing a large amount of pigment.

  Specific examples of these dispersants are trade names of EFKA (manufactured by EFKA Chemicals Beebuy (EFKA)), Disperbik (manufactured by BYK Chemie), Disparon (manufactured by Enomoto Kasei), SOLPERSE (manufactured by Lubrizol), KP (Manufactured by Shin-Etsu Chemical Co., Ltd.), polyflow (manufactured by Kyoeisha Chemical Co., Ltd.) and the like.

  These dispersants may be used alone or in combination of two or more in any combination and ratio.

  As the dispersion aid, for example, a pigment derivative or the like can be used. Examples of the dye derivative include azo, phthalocyanine, quinacridone, benzimidazolone, quinophthalone, isoindolinone, dioxazine, anthraquinone, indanthrene, perylene, perinone, diketopyrrolopyrrole. And oxinophthalone derivatives are preferred.

  Examples of the substituent of the dye derivative include a sulfonic acid group, a sulfonamide group and a quaternary salt thereof, a phthalimidomethyl group, a dialkylaminoalkyl group, a hydroxyl group, a carboxyl group, and an amide group directly on the pigment skeleton or an alkyl group and an aryl group. And those bonded via a heterocyclic group or the like. Among these, a sulfonic acid group is preferable. Further, a plurality of these substituents may be substituted on one pigment skeleton. Specific examples of the dye derivative include a sulfonic acid derivative of phthalocyanine, a sulfonic acid derivative of quinophthalone, a sulfonic acid derivative of anthraquinone, a sulfonic acid derivative of quinacridone, a sulfonic acid derivative of diketopyrrolopyrrole, a sulfonic acid derivative of dioxazine, and the like.

These dispersing aids and pigment derivatives may be used alone or in combination of two or more in any combination and ratio. The pigment derivatives used in the examples described later are shown in Table 2 below.

(Transparent resin)
The photosensitive coloring composition used as the light-shielding layer or the colored layer further contains a polyfunctional monomer, a photosensitive resin or a non-photosensitive resin, a polymerization initiator, a solvent and the like in the pigment dispersion. Highly transparent organic resins that can be used in the present invention, such as photosensitive resins and non-photosensitive resins, are collectively referred to as transparent resins.

  Transparent resins include thermoplastic resins, thermosetting resins, and photosensitive resins. Examples of thermoplastic resins include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, and poly Vinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane resin, polyester resin, acrylic resin, alkyd resin, polystyrene resin, polyamide resin, rubber resin, cyclized rubber resin, celluloses, polybutadiene , Polyethylene, polypropylene, polyimide resin and the like. Examples of the thermosetting resin include epoxy resins, benzoguanamine resins, rosin-modified maleic acid resins, rosin-modified fumaric acid resins, melamine resins, urea resins, and phenol resins. As the thermosetting resin, a resin obtained by reacting the following melamine resin with an isocyanate group-containing compound may be used.

(Alkali-soluble resin)
The photosensitive coloring composition used in the present invention desirably employs a transparent resin that is an alkali-soluble resin. The alkali-soluble resin is not particularly limited as long as it is a resin containing a carboxyl group or a hydroxyl group. Examples thereof include epoxy acrylate resins, novolac resins, polyvinyl phenol resins, acrylic resins, carboxyl group-containing epoxy resins, carboxyl group-containing urethane resins, and the like. Of these, epoxy acrylate resins, novolak resins, and acrylic resins are preferable, and epoxy acrylate resins and novolak resins are particularly preferable.

(acrylic resin)
Examples of the transparent resin that can be used in the present invention include the following acrylic resins. Acrylic resin is, for example, (meth) acrylic acid; methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, t-butyl (meth) acrylate pencil Alkyl (meth) acrylates such as (meth) acrylate and lauryl (meth) acrylate; hydroxyl-containing (meth) acrylates such as hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate; ethoxyethyl (meth) acrylate and glycidyl (meta ) Ether group-containing (meth) acrylates such as acrylates; and alicyclic (meth) acrylates such as cyclohexyl (meth) acrylates, isobornyl (meth) acrylates, dicyclopentenyl (meth) acrylates, etc. Coalescence, and the like.

In addition, the monomer mentioned above can be used individually or in combination of 2 or more types. Further, it may be a copolymer of a compound such as styrene, cyclohexylmaleimide, and phenylmaleimide copolymerizable with these monomers.

Further, for example, a copolymer obtained by copolymerizing a carboxylic acid having an ethylenically unsaturated group such as (meth) acrylic acid, and a compound containing an epoxy group and an unsaturated double bond such as glycidyl methacrylate are obtained. Reacting or adding a carboxylic acid-containing compound such as (meth) acrylic acid to a polymer of an epoxy group-containing (meth) acrylate such as glycidyl methacrylate or a copolymer thereof with other (meth) acrylate Thus, a resin having photosensitivity can be obtained.

  Furthermore, a resin having photosensitivity can also be obtained by reacting a polymer having a hydroxyl group of a monomer such as hydroxyethyl methacrylate with a compound having an isocyanate group such as methacryloyloxyethyl isocyanate and an ethylenically unsaturated group. Can be obtained.

  In addition, as described above, it is possible to react a copolymer such as hydroxyethyl methacrylate having a plurality of hydroxyl groups with a polybasic acid anhydride to introduce a carboxyl group into the copolymer to obtain a resin having a carboxyl group. I can do it. The manufacturing method is not limited to the method described above.

  Examples of acid anhydrides used in the above reaction include, for example, malonic acid anhydride, succinic acid anhydride, maleic acid anhydride, itaconic acid anhydride, phthalic acid anhydride, tetrahydrophthalic acid anhydride, hexahydrophthalic acid anhydride , Methyltetrahydrophthalic anhydride, trimellitic anhydride and the like.

  The solid content acid value of the acrylic resin described above is preferably 20 mgKOH / g or more and 180 mgKOH / g or less. When the acid value is less than 20 mgKOH / g, the development speed of the photosensitive resin composition is too slow, and the time required for development increases, and the productivity tends to be inferior. On the other hand, when the solid content acid value is larger than 180 mgKOH / g, on the contrary, the development speed is too high, and there is a tendency that pattern peeling or pattern chipping after development occurs.

  Furthermore, when the acrylic resin has photosensitivity, the double bond equivalent of the acrylic resin is preferably 100 or more, more preferably 100 or more and 2000 or less, and most preferably 100 or more and 1000 or less. If the double bond equivalent exceeds 2000, sufficient photocurability may not be obtained.

(Photopolymerizable monomer)
Examples of photopolymerizable monomers include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, cyclohexyl (meth) acrylate, polyethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylol Various acrylic and methacrylic acid esters such as propane tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tricyclodecanyl (meth) acrylate, melamine (meth) acrylate, epoxy (meth) acrylate, (meth) Acrylic acid, styrene, vinyl acetate, (meth) acrylamide,
N-hydroxymethyl (meth) acrylamide, acrylonitrile, etc. are mentioned.

Moreover, it is preferable to use the polyfunctional urethane acrylate which has the (meth) acryloyl group obtained by making polyfunctional isocyanate react with the (meth) acrylate which has a hydroxyl group. The combination of the (meth) acrylate having a hydroxyl group and the polyfunctional isocyanate is arbitrary and is not particularly limited. Moreover, one type of polyfunctional urethane acrylate may be used alone, or two or more types may be used in combination.

(Photopolymerization initiator)
As photopolymerization initiators, 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl)
2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl)-
Acetophenone compounds such as butan-1-one, benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzyldimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, Benzophenone compounds such as hydroxybenzophenone, acrylated benzophenone, 4-benzoyl-4′-methyldiphenyl sulfide, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxan Thioxanthone compounds such as Son, 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazi , 2- (p-methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) -s-triazine, 2-piphenyl -4,6-bis (trichloromethyl) -s-triazine, 2,4-bis (trichloromethyl) -6-styryl s-triazine, 2- (naphth-1-yl) -4,6-bis (trichloromethyl) ) -S-triazine, 2- (4-methoxy-naphth-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2,4
-Trichloromethyl- (piperonyl) -6-triazine, 2,4-trichloromethyl (4
Triazine compounds such as' -methoxystyryl) -6-triazine, 1,2-octanedione, 1- [4- (phenylthio)-, 2- (O-benzoyloxime)], O- (acetyl) -N- Oxime ester compounds such as (1-phenyl-2-oxo-2- (4′-methoxy-naphthyl) ethylidene) hydroxylamine, bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide, 2,4,6 -Phosphine compounds such as trimethylbenzoyldiphenylphosphine oxide, quinone compounds such as 9,10-phenanthrenequinone, camphorquinone, ethyl anthraquinone, borate compounds, carbazole compounds, imidazole compounds, titanocene compounds, etc. It is done.

  Oxime derivatives (oxime compounds) are effective in improving sensitivity. These can be used singly or in combination of two or more.

(Sensitizer)
It is preferable to use a polymerization initiator and a photosensitizer in combination. As a sensitizer, α-acyloxy ester, acylphosphine oxide, methylphenylglyoxylate, benzyl, 9,10-phenanthrenequinone, camphorquinone, ethylanthraquinone, 4,4′-diethylisophthalophenone, A compound such as 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, 4,4′-diethylaminobenzophenone may be used in combination.

  The sensitizer can be contained in an amount of 0.1 to 60 parts by mass with respect to 100 parts by mass of the photopolymerization initiator.

(Ethylenically unsaturated compounds)
The photopolymerization initiator is preferably used together with an ethylenically unsaturated compound. The ethylenically unsaturated compound means a compound having at least one ethylenically unsaturated bond in the molecule. Among them, it is a compound having two or more ethylenically unsaturated bonds in the molecule from the viewpoints of polymerizability, crosslinkability, and the accompanying difference in developer solubility between exposed and non-exposed areas. Is preferred. The unsaturated bond is more preferably a (meth) acrylate compound derived from a (meth) acryloyloxy group.
Examples of the compound having one or more ethylenically unsaturated bonds in the molecule include unsaturated carboxylic acids such as (meth) acrylic acid, crotonic acid, isocrotonic acid, maleic acid, itaconic acid, citraconic acid, and alkyl esters thereof. , (Meth) acrylonitrile, (meth) acrylamide, styrene and the like. Typical examples of compounds having two or more ethylenically unsaturated bonds in the molecule include esters of unsaturated carboxylic acids and polyhydroxy compounds, (meth) acryloyloxy group-containing phosphates, hydroxy (meta ) Urethane (meth) acrylates of acrylate compounds and polyisocyanate compounds, and epoxy (meth) acrylates of (meth) acrylic acid or hydroxy (meth) acrylate compounds and polyepoxy compounds.

(Multifunctional thiol)
The photosensitive coloring composition can contain a polyfunctional thiol that functions as a chain transfer agent. The polyfunctional thiol may be a compound having two or more thiol groups. For example, hexanedithiol, decanedithiol, 1,4-butanediol bisthiopropionate, 1,4-butanediol bisthioglycolate, ethylene Glycol bisthioglycolate, ethylene glycol bisthiopropionate, trimethylolpropane tristhioglycolate, trimethylolpropane tristhiopropionate, trimethylolpropane tris (3-mercaptobutyrate), pentaerythritol tetrakisthioglycolate, Pentaerythritol tetrakisthiopropionate, trimercaptopropionic acid tris (2-hydroxyethyl) isocyanurate, 1,4-dimethylmercaptobenzene, 2,4,6-trimercap -s- triazine, 2- (N, N- dibutylamino) -4,6-dimercapto -s- triazine.

These polyfunctional thiols can be used alone or in combination. The polyfunctional thiol can be used in an amount of 0.2 to 150 parts by weight, preferably 0.2 to 100 parts by weight, with respect to 100 parts by weight of the pigment in the photosensitive coloring composition. .

(Storage stabilizer)
The photosensitive coloring composition can contain a storage stabilizer in order to stabilize the viscosity with time of the composition. Examples of the storage stabilizer include quaternary ammonium chlorides such as benzyltrimethyl chloride and diethylhydroxyamine, organic acids such as lactic acid and oxalic acid, and organic acids such as methyl ether, t-butylpyrocatechol, triethylphosphine, and triphenylphosphine. Examples thereof include phosphine and phosphite. The storage stabilizer can be contained in an amount of 0.1 to 10 parts by mass with respect to 100 parts by mass of the pigment in the photosensitive coloring composition.

(Adhesion improver)
Moreover, in order to improve the adhesiveness with a board | substrate, the said photosensitive coloring composition can also be made to contain contact | adherence improving agents, such as a silane coupling agent. Examples of the silane coupling agent include vinyl silanes such as vinyltris (β-methoxyethoxy) silane, vinylethoxysilane, and vinyltrimethoxysilane, (meth) acrylsilanes such as γ-methacryloxypropyltrimethoxysilane, β- (3 , 4-epoxycyclohexyl) ethyltrimethoxysilane,
β- (3,4-epoxycyclohexyl) methyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane, β- (3,4-epoxycyclohexyl) methyltriethoxysilane, γ-glycidoxy Propyltrimethoxysilane, γ-
Epoxysilanes such as glycidoxypropyltriethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β (aminoethyl) γ-aminopropyltriethoxysilane, N-β (aminoethyl) γ-aminopropylmethyldiethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-phenyl-γ-aminopropyltriethoxysilane, etc. And thiosilanes such as γ-mercaptopropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane. The silane coupling agent can be contained in an amount of 0.01 to 100 parts by mass with respect to 100 parts by mass of the pigment in the photosensitive coloring composition.

(solvent)
The photosensitive coloring composition is mixed with a solvent such as water or an organic solvent in order to enable uniform coating on the substrate. Moreover, when the coloring composition mentioned above forms the colored layer of a color filter, a solvent also has the function to disperse | distribute a pigment uniformly. Examples of the solvent include cyclohexanone, ethyl cellosolve acetate, butyl cellosolve acetate, 1-methoxy-2-propyl acetate, diethylene glycol dimethyl ether, ethylbenzene, ethylene glycol diethyl ether, xylene, ethyl cellosolve, methyl-n amyl ketone, propylene glycol monomethyl ether, toluene, Examples include methyl ethyl ketone, ethyl acetate, methanol, ethanol, isopropyl alcohol, butanol, isobutyl ketone, petroleum solvent, and the like. These can be used alone or in combination.

  The solvent can be contained in an amount of 800 to 4000 parts by mass, preferably 1000 to 2500 parts by mass with respect to 100 parts by mass of the pigment in the coloring composition.

(Film thickness / liquid crystal thickness)
As described above, the technique related to the present invention is suitable for a liquid crystal driving system such as IPS (horizontal alignment, lateral electric field system) or FFS (Fringe Field Switching), but by forming a transparent electrode on a color filter, VA ( The present invention can also be applied to a liquid crystal display device having a vertical alignment and a vertical electric field method. In the method of applying a liquid crystal drive voltage between the transparent electrode on the color filter and the pixel electrode of the array substrate on which the liquid crystal drive element (TFT), which is the opposite substrate, is formed, usually the liquid crystal thickness (cell gap) The thinner one can increase the response speed of the liquid crystal. In the main liquid crystal driving method described above, the liquid crystal thickness is in the range of approximately 2 μm to 4 μm, particularly 3 μm to 4 μm. In addition, since the color (color change) when viewed from an oblique direction is smaller when the liquid crystal thickness is reduced, the liquid crystal thickness is from the viewpoint of improving responsiveness and coloring, and from the viewpoint of the amount of liquid crystal material used. Thinner is better. In addition, the film thickness of a colored pixel means the thickness from the surface of a colored pixel center to the transparent substrate surface which the said colored pixel touches.

  However, the thinner the liquid crystal is, or the larger the liquid crystal display screen is, the greater the influence of dust and foreign matter when forming a liquid crystal cell, and the lower limit of the liquid crystal thickness in the vertical electric field method is about 2 μm. In the IPS and FFS systems, since it is not necessary to form a transparent electrode on the color filter side, an opposing short circuit (electrical short circuit) due to mixed conductive dust hardly occurs. From the viewpoint of conductive dust, the IPS and FFS methods can reduce the liquid crystal thickness. In order to reduce the thickness of the liquid crystal layer, it is desirable to use a liquid crystal having a refractive index anisotropy Δn larger than 0.08.

  Therefore, the film thickness of the light shielding layer and the colored pixels of the color filter substrate according to the present invention is a film thickness close to the above-mentioned liquid crystal thickness, for example, 0.6 times to 1 time. The height of the laminated spacer of the colored layer can be finely adjusted by the thickness of a base formed in advance as a base. The optical density OD of the light shielding layer according to the present invention is preferably higher, and is preferably 3 or more in terms of OD value. The film thickness of the colored pixels can be controlled by the solid ratio (solvent amount, viscosity) of the photosensitive colored composition used for forming the colored pixels and the coating conditions. When the film thickness is controlled without changing the spectral characteristics of the colored pixels, the ratio of the transparent material other than the resin may be changed so that the ratio of the pigment applied to the unit area is constant.

  Of course, the present invention can also cope with the film thickness of the light-shielding layer and the colored pixels of less than 2 μm due to the progress of liquid crystal display devices with a small screen size and liquid crystal cell technology. The thickness of the colored layer considering the color reproduction with the color filter is as follows. That is, in a transmissive display (a display device in which a light source such as a fluorescent lamp or LED is arranged on the back side of a liquid crystal display device), in order to maintain color purity (in other words, to maintain a constant pigment concentration per unit area) The lower limit of the thickness of the colored layer is around 0.6 μm. It is almost the limit of 0.6 μm that a pattern can be formed by a known photolithography technique at a high pigment concentration. In the case of a reflective display, light incident from the outside is reflected by a reflective electrode such as aluminum and is viewed through a color filter twice. is there.

  Note that, depending on the density of the electrodes to be driven and the arrangement / driving method, the thickness of the colored layer may be the same for the transmissive portion and the reflective portion, so that a transflective display is possible. For example, using the technique disclosed in Japanese Patent Application Laid-Open No. 2007-34151, a comb-like pixel electrode made of a transparent conductive film and a solid reflective electrode (for example, a metal thin film such as aluminum or silver) on the array substrate side. The technique of the present invention can be applied to a color filter for reflective type or transflective display in which the is formed. The common electrode disposed on the TFT substrate in the embodiments described later may be a reflective electrode.

(Pedestal and spacer)
The spacer pedestal according to the present invention may be formed only at least in a portion where a spacer to be described later is formed and a portion necessary for shielding an active element such as a TFT. Moreover, it is desirable that the spacer base according to the present invention is simultaneously formed of the same material as the light shielding layer that is the frame portion. Specifically, a photomask in which multiple types of patterns with different transmissivities such as gray tone (gradation mask) are formed, or an opening smaller than the pattern size of the pedestal (the amount of exposure can be adjusted by adjusting the size of the opening) The light-shielding layer and the pedestal can be formed at the same time by exposure using a photomask having an opening with a specially designed opening shape and photolithography after development after exposure. As a photomask, a photomask having a light-shielding pattern as a thin film of metal chromium, a semi-transmissive portion as a metal oxide film such as ITO, and a transmissive portion without formation of these films may be used. The metal oxide film has an advantage that the transmittance can be adjusted by the film forming conditions and the film thickness.
The present inventors examined a suitable range of the film thickness of the pedestal. That is, when the thickness of the colored layer on the pedestal was measured while changing the thickness of the pedestal, the result shown in FIG. 4 was obtained. As shown in FIG. 4, it can be seen that if the thickness of the pedestal is 1.0 μm or less, it is easy to stably obtain the thickness of the colored layer laminated thereon. On the other hand, when the pedestal film thickness exceeds 1.0 μm, the film thickness of the colored layer laminated thereon is suddenly changed and becomes thin and unstable. When the pedestal film thickness is less than 0.4 μm, it is difficult to obtain a stable film thickness in the photolithography process. Therefore, the thickness of the pedestal is preferably in the range of 0.4 μm to 1.0 μm. Note that the film thickness of the black matrix, which will be described later, may be formed as thin as 0.4 μm or less, or the formation of the black matrix may be omitted.

  The pedestal pattern has a function of suppressing generation of a photocurrent due to light incident on an active element such as a TFT for driving liquid crystal, and thus can be used in combination as a light shielding pattern. For the light shielding of active elements such as TFTs, it is sufficient that the optical density is 1, so that the film thickness obtained by adding the film thickness of the pedestal of 0.4 μm to 1.0 μm and the overlapping portion film thickness of the colored pixels is The function of shading can be sufficiently achieved.

  In the case of forming a rounded spacer, a blue colored layer having less pigment content and fluidity than the other two colors is used as a top layer of a three-layer stack or a two-layer stack spacer. be able to.

  The color filter substrate according to the present invention may be a color filter of four or more colors provided with colored pixels of complementary colors such as yellow pixels or white (transparent) pixels in addition to blue pixels, red pixels, and green pixels. In addition to the spacer (main spacer) 5 having a height corresponding to the thickness of the liquid crystal, a sub-spacer 6 having a low height may be provided as shown in FIGS. When the main spacer 5 has a three-layer structure, for example, the two-layer sub-spacer 6 may be disposed only in the frame portion. The sub-spacer 6 may be a single colored layer or may be used by reducing the height by using a small-diameter spacer.

  The color filter substrate according to the present invention can be applied to a liquid crystal display device with a thin liquid crystal thickness in the near future. However, with a thin liquid crystal thickness, for example, the arrangement of spacer formation near the liquid crystal sealing opening is changed, and the liquid crystal cell is formed. The number of spacers and the layout may be adjusted in consideration of the flow of the liquid crystal material.

  In the color filter substrate according to the present invention, the light shielding layer 2 and the pedestals 4 and 4 ′ can be formed by the same photolithography process, as will be described later. The height of the plurality of spacers 5 is substantially the same, but is preferably a height obtained by adding a margin of about 0.1 μm in the liquid crystal cell to the liquid crystal thickness. In addition, as described above, the pedestal 4 ′ not formed with the spacer 5 is disposed for the purpose of adjusting the aperture ratio of the red pixel 3R, the green pixel 3G, and the blue pixel 3B and shielding the active elements such as TFTs. It is.

In the color filter substrate according to the present invention, the pedestal 4 and the spacer 5 are in units of colored pixels.
For example, it may be formed in the center in the longitudinal direction of the pixel (the center of the pixel or one central portion of the long side of the pixel), and these spacers may be a structure that also functions as a liquid crystal alignment control function.

  A circular shape, a diamond shape, a polygonal shape, or the like can be adopted as a planar view shape of such a structure serving both as a spacer and a liquid crystal alignment control function. The TFT element for driving the liquid crystal display element can also be formed at the center in the longitudinal direction of the pixel in accordance with the position of the spacer. For example, in the case of a liquid crystal alignment control structure having a rhombic shape in plan view, the pixel electrode on the TFT substrate side surrounds the spacer in a diamond-shaped concentric slit shape (a cross-sectional shape of the transparent electrode and alternating patterns). What is necessary is just to arrange | position. This is particularly effective when a vertically aligned liquid crystal is driven by the FFS method.

  In addition, such a structure serving as both the spacer and the alignment control structure can substantially increase the aperture ratio of the liquid crystal display device and improve the brightness. In general, the alignment control structure can be formed with a high height or with a high density to improve the response of liquid crystal molecules. This leads to a decrease in the aperture ratio. On the other hand, the configuration in which both the spacer and the alignment control structure are used does not lead to a decrease in the aperture ratio.

  In addition, the spacer having such a configuration has a high fluidity when the colored layer is thermally cured. For example, a smooth cross-sectional shape can be obtained by covering the entire spacer with the blue colored layer as the uppermost layer.

(Black matrix thickness)
FIG. 6 shows three colors stacked on the light shielding layer 2, the pedestal 4, the black matrix 8, the red pixel 3R, the green pixel 3G, the blue pixel 3B, and the pedestal 4 in the color filter substrate according to another embodiment of the present invention. It is a figure which shows the planar view arrangement | positioning of the spacer 5 by lamination | stacking of a colored layer, and the subspacer 6 by lamination | stacking of a colored layer of 2 colors. That is, in FIG. 6, a black matrix 8 is provided that separates three colored pixels including a red pixel 3R, a green pixel 3G, and a blue pixel 3B.

  As will be described later, the light shielding layer 2, the pedestal 4, and the black matrix 8 are formed of the same material by the same photolithography process. The height of the plurality of spacers 5 is substantially the same, but the height adjustment is performed by adjusting the thickness of the pedestal, selection of the colored layer, process conditions such as coating / developing / hardening in the color filter manufacturing process, spacer diameter Various adjustments are possible depending on (size) and the like. Further, it is also shown in FIG. 3 that the pedestal 4 ′ not formed with the spacers 5 is disposed for the purpose of adjusting the aperture ratio of the red pixel R, the green pixel G, and the blue pixel B and shielding the active elements such as TFTs. It is the same as the structure shown.

  According to the present inventors, it has been confirmed that the film thickness of the black matrix 8 made of the same material as the frame portion (light-shielding layer) affects the flatness improvement. Note that the black matrix 8 is a lattice-shaped light shielding pattern that is usually formed so as to surround the colored pixels for the purpose of improving contrast, but may be formed in a stripe shape in the longitudinal direction of the pixel. In addition, as shown in FIG. 3, the color filter board | substrate which excluded the black matrix 8 may be sufficient.

  FIG. 5 is a characteristic diagram showing a change in the height of the protrusion at the end of the colored pixel superimposed on the black matrix when the thickness of the black matrix is changed. From the results shown in FIG. 5, when the film thickness of the black matrix exceeds 1.1 μm, the height of the protrusions on the color pixel end portion is remarkably increased, which is unfavorable for liquid crystal alignment. It can be seen that when the thickness of the black matrix is 1 μm or less, particularly 0.8 μm or less, the projection height at the end of the colored pixel is as low as 0.25 μm or less, and further 0.2 μm or less.

  Therefore, by reducing the thickness of the black matrix, it is possible to ensure good flatness, including variations in the thickness of the colored pixels, of less than ± 0.15 μm. It is possible to provide a color filter that meets the high demands of a high-quality liquid crystal display device such as a method. That is, a color filter having high flatness within a 1/4 wavelength range (± 0.15 μm) of the green wavelength of 550 nm, which is highly visible to human eyes, can be obtained, and coloring unevenness of the liquid crystal display element can be reduced. it can.

  A thin black matrix can be formed simultaneously with the light shielding layer by a photolithography technique using a gray-tone mask or a half-tone mask, as in the above-described pedestal. Alternatively, the exposure amount of the light shielding layer and the black matrix may be formed by changing the number of shots to give a film thickness difference using laser exposure. Note that FIG. 5 does not show a film thickness of less than 0.4 μm, but even if the film thickness of the black matrix is less than 0.4 μm, the height of the protrusions superimposed thereon is similarly reduced. The present inventors have confirmed that.

  Unlike the light-shielding layer (frame portion), the black matrix does not require much light-shielding properties. Therefore, in the present invention, it is possible to omit the formation of the black matrix and replace the black matrix by simply superimposing colored layers of different colors. is there. Note that light from a light source (backlight) disposed on the back surface of the transmissive liquid crystal display device can be shielded by a scanning line or a signal line of an active element such as a TFT.

(Colored pixel overlap shape)
As a TFT exposure apparatus, a highly accurate apparatus with an alignment accuracy of 3σ and 1.5 μm is commercially available. In the case of a color filter substrate, an alignment mark attached to an organic material (for example, a photosensitive coloring composition such as a black matrix) is used unlike the metal wiring of the TFT. In addition, the colored layer to be laminated is also an organic material, the film thickness is 1 to 4 μm, which is thicker than the TFT wiring, and the pattern edge is tapered, so the alignment accuracy is 4.5 μm at 3σ. Is at least required.

  As described above, the thickness of the liquid crystal layer of the IPS mode, VA mode, and FFS mode liquid crystal display devices is approximately 2 μm to 4 μm. Usually, the thickness of the colored layer of the color filter substrate is about 0.6 to 1 times the thickness of the liquid crystal layer. Therefore, the thickness of the colored layer in the color filter substrate according to an embodiment of the present invention is 1.2 μm or more and 4 μm or less. Note that the line width of the black matrix differs between a mobile (small) liquid crystal display device and a large TV, but is about 5 μm or more and 30 μm or less. If priority is given to the aperture ratio of the pixels, the formation of the black matrix may be omitted as described above.

FIG. 7 shows a pattern edge shape of the thick colored pixel 12 and FIG. 8 shows a pattern edge shape of the thin colored pixel 13. The length m and n of the pattern edge related to the alignment is 4.5 μm, the thickness of the colored pixel 12 is applied to the thickness t of the colored pixel 13 and the thickness t of the colored pixel 13 is 1.2 μm to 4 μm, When the taper angles θ ₁ and θ _{2 of} the pattern edges (angles formed with the surface of the transparent substrate 11 at the end of the colored pixel) are calculated, the angle range is about 15 ° to 40 °. Therefore, although depending on the film thicknesses s and t of the colored layers 12 and 13, it is desirable to form the end portions of the colored pixels at a taper angle of 15 ° or more and 40 ° or less in order to obtain good flatness. . When the taper angle at the end of the colored pixel exceeds 40 °, good flatness cannot be obtained, and it is difficult to obtain a taper angle of less than 15 °.

  The end shape of the colored pixel can be controlled by various methods such as changing the amount of the polymerization initiator, the developing method, and the exposure amount. The planar view shape of the colored pixels is preferably a continuous stripe shape of the colored pixels.

  On the color filter substrate according to the present invention, for the purpose of covering the subtle texture of the color filter surface (surface irregularities of 0.1 μm or less) and improving the electrical insulation, a protective layer made of a transparent resin or insulation Layers may be stacked. In order to ensure the height of the spacer to some extent, a protective layer that facilitates ensuring followability (in the opposite direction to ensuring flatness) can be formed by increasing the molecular weight of the transparent resin. The height of the spacer can be ensured by applying and forming the protective layer with a thin film thickness of, for example, 0.05 μm to 0.3 μm.

  The protective layer may also serve as an alignment film, or may contain an additive (for example, an ultraviolet absorber) that assists photoalignment. Further, a transparent conductive film made of a metal oxide thin film called ITO or the like may be formed. Alternatively, a protrusion may be formed in the pixel in advance using the same material as the light shielding layer, and a colored layer may be further stacked thereon to be used as an alignment control structure.

  Further, the spacer and the alignment control structure may be used together. For example, a TFT element for driving the liquid crystal on the TFT substrate side and a pedestal on the color filter substrate side are formed at the center of the pixel so as to face each other, so that the vertical alignment liquid crystal display spacer and the alignment control structure are combined. be able to.

  The transparent conductive film may be formed in a comb-like shape, and a slit that is an opening may be formed in the transparent conductive film for the purpose of controlling liquid crystal alignment.

(Preparation of light shielding layer material / black composition)
(Pigment dispersion RD1)
As a coloring agent, C.I. I. Pigment red 254 / C.I. I. Pigment Red 177 = 80/20 (weight ratio) 20 parts of a mixture, 5 parts of BYK-2001 (in terms of solid content) as a dispersant, and 75 parts of propylene glycol monomethyl ether acetate as a solvent are dispersed using a bead mill to disperse the pigment. Body (RD1) was prepared.

(Pigment dispersion YD1)
As a coloring agent, C.I. I. 20 parts of Pigment Yellow 150, 5 parts of Solsperse 24000 as a dispersant (in terms of solid content), and 75 parts of propylene glycol monomethyl ether acetate as a solvent were dispersed by a bead mill to prepare a pigment dispersion (YD1).

(Pigment dispersion BD1)
As a coloring agent, C.I. I. Pigment Blue 15: 6, 20 parts of Ajisper PB-821 as a dispersant (in terms of solid content), and 75 parts of propylene glycol monomethyl ether acetate as a solvent are treated with a bead mill to prepare a pigment dispersion (BD1) did.

(Pigment dispersion liquid VD1)
As a coloring agent, C.I. I. A pigment dispersion (VD1) was prepared by treating 20 parts of Pigment Violet 23, 5 parts of Ajisper PB-821 as a dispersant (in terms of solid content) and 75 parts of propylene glycol monomethyl ether acetate as a solvent using a bead mill.

(Synthesis of resin solution (P1))
The reaction vessel was charged with 800 parts of cyclohexanone, heated while injecting nitrogen gas into the vessel, and a mixture of the following monomer and thermal polymerization initiator was added dropwise to carry out a polymerization reaction.

Styrene 60 parts Methacrylic acid 60 parts Methyl methacrylate 65 parts Butyl methacrylate 65 parts Thermal polymerization initiator 10 parts Chain transfer agent 3 parts After dripping and heated sufficiently, 2.0 parts of thermal polymerization initiator was dissolved in 50 parts of cyclohexanone. The solution was added and the reaction was further continued to obtain an acrylic resin solution.

  An acrylic resin solution was prepared by adding cyclohexanone to the resin solution so that the non-volatile content was 20% by weight, and it was designated as resin solution (P1). The weight average molecular weight of the acrylic resin was about 10,000.

(Black composition)
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 black composition. This black composition is used for forming a light shielding layer and a pedestal in Examples to be described later.

21 parts of the above pigment dispersion (RD1) 17 parts of the above pigment dispersion (BD1) 4 parts of the above pigment dispersion (YD1) 9 parts of the resin solution (P-1) 4.8 parts of trimethylolpropane triacrylate Photopolymerization initiator ( "Irgacure-369" manufactured by Ciba Geigy Co., Ltd.) 2.8 parts Photosensitizer ("EAB-F" manufactured by Hodogaya Chemical Co., Ltd.) 0.2 parts Cyclohexanone 36.2 parts Using this black composition, it was applied and cured. A light shielding layer having an optical density (OD value) of about 1.8 can be obtained with a film thickness of 1 μm. The film thickness can be adjusted depending on the coating conditions. It is also possible to control the concentration by adjusting the component (solid content) ratio of the resin solution. In addition, since the green organic pigment has bad light-shielding property, it is not added to this black composition.

(Measurement of optical density (OD))
The optical density (OD value) is a characteristic value representing the degree of light absorption by a substance. When the optical path length is constant, the larger the OD value, the higher the substance concentration. The optical density (OD value) in the color filter substrate according to the present invention is expressed by the following mathematical formula (1). A tristimulus value Y with a C light source was measured for a measurement sample obtained using the above black composition using a spectroscope OSP-200 manufactured by Olympus, and an optical density (OD) was calculated by the following formula.

Optical density (OD) =-log (Y / 100)
(Y is the tristimulus value Y with the C light source)
The measurement sample was obtained as follows. First, the black composition Blk diluted with an organic solvent to adjust the concentration was applied to a thickness of 1 μm on a glass substrate and allowed to dry naturally. Subsequently, it heated at 90 degreeC with the hotplate for 1 minute, and the excess solvent was removed and dried. Then, it baked in oven at 230 degreeC for 1 hour, and was set as the optical density measurement sample of a light shielding layer.

  When the optical density (OD) of this measurement sample was measured, a value of approximately 1.8 was obtained. In the light-shielding layer (film thickness 2.5 μm) of Examples described later, the optical density was about 4.5.

(Preparation of colored pixel material / colored composition)
[Pigment production example R2]
100 parts of diketopyrrolopyrrole red pigment PR254 ("Irgafoa Red B-CF" manufactured by Ciba Specialty Chemicals; R-1), 18 parts of dye derivative (D-1), 1000 parts of crushed salt, and 120 parts of diethylene glycol Was charged into a stainless steel 1 gallon kneader (manufactured by Inoue Seisakusho) and kneaded at 60 ° C. for 10 hours.

  The mixture was poured into 2000 parts of warm water, stirred with a high-speed mixer for about 1 hour while being heated to about 80 ° C. to form a slurry, filtered and washed with water repeatedly to remove salt and solvent, and then at 24 ° C. for 24 hours. It was dried for a period of time to obtain 115 parts of a salt milled pigment (R2).

[Pigment production example R3]
100 parts of anthraquinone red pigment PR177 (“Chromophthal Red A2B” manufactured by Ciba Specialty Chemicals), 8 parts of a dye derivative (D-2), 700 parts of crushed salt, and 180 parts of diethylene glycol are made of 1 gallon kneader made of stainless steel (Inoue Seisakusho) And kneaded at 70 ° C. for 4 hours. The mixture was put into 4000 parts of warm water, heated to about 80 ° C., stirred with a high speed mixer for about 1 hour to form a slurry, filtered and washed with water to remove salt and solvent, and then at 80 ° C. for 24 hours. Drying gave 102 parts of salt milled pigment (R3).

[Pigment production example R4]
A sulfonation flask was charged with 170 parts of tert-amyl alcohol under a nitrogen atmosphere. To this was added 11.04 parts of sodium and the mixture was heated to 92-102 ° C. The molten sodium was kept at 100-107 ° C. overnight with vigorous stirring.

  A solution of 44.2 parts of 4-chlorobenzonitrile and 37.2 parts of diisopropyl succinate in 50 parts of tert-amyl alcohol at 80 ° C. and 2 parts at 80-98 ° C. was dissolved in the resulting solution. Introduced over time. After the introduction, the reaction mixture was further stirred at 80 ° C. for 3 hours, and 4.88 parts of diisopropyl succinate was added dropwise at the same time.

  The reaction mixture was cooled to room temperature and added to a 20 ° C. mixture consisting of 270 parts of methanol, 200 parts of water and 48.1 parts of concentrated sulfuric acid and stirring was continued at 20 ° C. for 6 hours. The obtained red mixture was filtered, and the residue was washed with methanol and water and then dried at 80 ° C. to obtain 46.7 parts of a red pigment (R4).

[Pigment production example G2]
In a molten salt of 200 ° C. of 356 parts of aluminum chloride and 6 parts of sodium chloride, 46 parts of zinc phthalocyanine was dissolved, cooled to 130 ° C., and stirred for 1 hour. The reaction temperature was raised to 180 ° C., and bromine was added dropwise at 10 parts per hour for 10 hours. Thereafter, chlorine was introduced at 0.8 parts per hour for 5 hours.

  The reaction solution was gradually poured into 3200 parts of water, then filtered and washed with water to obtain 107.8 parts of a crude zinc halide phthalocyanine pigment. The average number of brominations contained in one molecule of the crude zinc halide phthalocyanine pigment was 14.1 and the average number of chlorine was 1.9. In the present embodiment, the bromination number is not limited.

120 parts of the obtained crude zinc halide phthalocyanine pigment, 1600 parts of crushed salt,
And 270 parts of diethylene glycol 1 gallon kneader (manufactured by Inoue Seisakusho)
And kneaded at 70 ° C. for 12 hours.

The mixture was poured into 5000 parts of warm water, stirred at a high speed mixer for about 1 hour while being heated to about 70 ° C. to form a slurry, filtered and washed repeatedly to remove salt and solvent, and then at 80 ° C. for 24 hours. Drying gave 117 parts of salt milled pigment (G2).

[Pigment production example Y2]
A separable flask was charged with 150 parts of water, and further stirred with 63 parts of 35% hydrochloric acid to prepare a hydrochloric acid solution. Benzenesulfonyl hydrazide 38.7 while paying attention to foaming
The ice was added until the liquid temperature was 0 ° C. or lower. After cooling, 19 parts of sodium nitrite was charged over 30 minutes, stirred at 0 to 15 ° C. for 30 minutes, and then sulfamic acid was charged until no coloration was observed on the potassium iodide starch paper.

  Next, after adding 25.6 parts of barbituric acid, it heated up to 55 degreeC and stirred as it was for 2 hours. Next, 25.6 parts of barbituric acid was added, the temperature was raised to 80 ° C., and then sodium hydroxide was added until the pH reached 5. After further stirring at 80 ° C. for 3 hours, the temperature was lowered to 70 ° C., followed by filtration and washing with warm water.

  The obtained press cake was reslurried in 1200 parts of warm water, and then stirred at 80 ° C. for 2 hours. Thereafter, filtration was performed at the same temperature, and washing with 2000 parts of water at 80 ° C. was performed with warm water, and it was confirmed that benzenesulfonamide was transferred to the filtrate side. The obtained press cake was dried at 80 ° C. to obtain 61.0 parts of disodium azobarbituric acid.

  Thereafter, 200 parts of water was charged into a separable flask, and 8.1 parts of the obtained disodium azobarbituric acid powder was added and dispersed while stirring. After uniformly dispersing, the solution was heated to 95 ° C., and 5.7 parts of melamine and 1.0 part of diallylaminomelamine were added.

Further, a green solution obtained by dissolving 6.3 parts of cobalt (II) chloride hexahydrate in 30 parts of water was added dropwise over 30 minutes. After completion of the dropwise addition, complexation was performed at 90 ° C. for 1.5 hours. Thereafter, the pH was adjusted to 5.5, 20.4 parts of xylene, 0.4 part of sodium oleate, and 16 parts of water were previously stirred to add 20.4 parts of an emulsion, and the mixture was heated and stirred for 4 hours. did. After cooling to 70 ° C., it was quickly filtered, and warm water washing was repeated at 70 ° C. until the inorganic salt could be washed. Thereafter, 14 parts of an azo yellow pigment (Y2) was obtained through drying and grinding processes.

[Pigment production example B2]
Copper phthalocyanine-based blue pigment PB15: 6 (Toyo Ink Mfg. Co., Ltd. “Lionol Blue E
S "), 100 parts of crushed salt, and 100 parts of diethylene glycol were charged into a stainless steel 1 gallon kneader (Inoue Seisakusho) and kneaded at 70 ° C for 12 hours.

  The mixture was poured into 3000 parts of warm water, stirred at a high speed mixer for about 1 hour while being heated to about 70 ° C. to form a slurry, filtered and washed repeatedly to remove salt and solvent, and then at 80 ° C. for 24 hours. Dried to obtain 98 parts of salt milled pigment (B2).

[Pigment production example V2]
300 parts of LIONOGEN VIOLET RL (manufactured by Toyo Ink Manufacturing Co., Ltd.) was added to 3000 parts of 96% sulfuric acid, stirred for 1 hour, and poured into water at 5 ° C. After stirring for 1 hour, the mixture was filtered, washed with warm water until the washing solution became neutral, and dried at 70 ° C.

  120 parts of the obtained acid pasting pigment, 1600 parts of sodium chloride, and 100 parts of diethylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.) were charged into a stainless gallon kneader (manufactured by Inoue Seisakusho) and kneaded at 90 ° C. for 18 hours. Next, the mixture is poured into about 5 liters of warm water, heated to about 70 ° C. with a high speed mixer for about 1 hour to form a slurry, filtered, washed with water to remove sodium chloride and diethylene glycol. And dried at 80 ° C. for 24 hours to obtain 118 parts of a salt milled pigment (V2).

(Preparation of resin solution (P2))
Put 800 parts of cyclohexanone in a reaction vessel and inject nitrogen gas into the vessel at 100 ° C.
The mixture of the following monomer and thermal polymerization initiator was added dropwise at the same temperature over 1 hour to carry out the polymerization reaction.

Styrene 70.0 parts Methacrylic acid 10.0 parts Methyl methacrylate 65.0 parts Butyl methacrylate 65.0 parts Azobisisobutyronitrile 10.0 parts After dropwise addition, the mixture is further reacted at 100 ° C for 3 hours, and then azo A solution prepared by dissolving 2.0 parts of bisisobutyronitrile in 50 parts of cyclohexanone was added, and the reaction was further continued at 100 ° C. for 1 hour to synthesize a resin solution.

  After cooling to room temperature, about 2 g of the resin solution was sampled, heated and dried at 180 ° C. for 20 minutes to measure the nonvolatile content, and cyclohexanone was added to the previously synthesized resin solution so that the nonvolatile content was 20%. An acrylic resin solution (P2) was prepared.

(Preparation of pigment dispersion and coloring composition)
After uniformly stirring and mixing the mixture (parts by weight) shown in Table 3 below, using zirconia beads having a diameter of 1 mm, dispersing for 5 hours with a sand mill, and filtering with a 5 μm filter, red, green, and blue A pigment dispersion was obtained.

Thereafter, as shown in Table 4 below, a mixture of the pigment dispersion acrylic resin solution (P2), the monomer, the polymerization initiator, the sensitizer, and the organic solvent was mixed and stirred, filtered through a 5 μm filter, red, Colored compositions of green and blue were obtained. In the following examples, red pixels, green pixels, and blue pixels were formed using the colored composition shown in Table 4 below.

  Although not described in detail in the following examples, Table 5 below shows respective colored compositions for red, green, and blue pixels that can be formed with a film thickness of 3 μm, and Table 6 below shows a film thickness of 2 μm. Each colored composition for red pixel, green pixel, and blue pixel that can be formed by is shown.

In addition to the organic pigment as described above, a small amount of carbon whose dielectric constant is lowered by carbon surface treatment such as resin coating is added to the colorant of the black composition having a film thickness of 2 μm to increase the light shielding property, and The relative dielectric constant can be made 4 or less. Using these black compositions and colored compositions, the color filter substrate can be produced in the same manner as in the following examples, with the film thickness of the light shielding layer and the colored layer being 2 μm. By using a coloring composition that can be formed thick, the spacer can be formed in two layers. In addition, if the liquid crystal cell has a thin liquid crystal thickness, the spacer may be formed of two colored layers.

Example 1
(Production of color filter)
As shown in FIG. 1, on a transparent substrate 1, a light shielding layer 2, a red pixel 3R, a green pixel 3G, a blue pixel 3B, a pedestal 4 having a thickness of 0.6 μm, a red laminated portion 5R, a green laminated portion 5G, a blue color The spacer 5 was formed by stacking the stacked portions 5B. The light shielding layer 2 and the pedestal 4 are coated with the above-described black composition, dried, and then used with a gray tone photomask (a photomask having a difference in transmittance between the light shielding layer pattern and the pedestal pattern). The film was formed on the transparent substrate 1 by a film hardening process by repeated exposure / development and heat treatment.

  The film thicknesses of the light shielding layer 2 and the colored layers (red pixel 3R, green pixel 3G, blue pixel 3B) were all 2.5 μm. The spacer 5 has a bottom size of 30 μm, the height of the red colored layer constituting the spacer 5 on the pedestal 4 of the stacked portion 5R is 2.2 μm, and the height adjusted by the pedestal 4 having a height of 0.6 μm. The height h of 5 was 3.65 μm. The liquid crystal thickness of the target liquid crystal display device is 3.6 μm.

  The protrusion height d on the pedestal 4 shown in FIG. 2 was as low as 0.1 μm on the blue pixel side and 0.17 μm on the green pixel side, and the flatness was good.

Example 2
(Production of liquid crystal display device)
A liquid crystal display device having the structure shown in FIG. 9 was produced.

  The color filter substrate 21 and the TFT substrate 22 are arranged to face each other, and an IPS liquid crystal layer 23 that is aligned in parallel with the substrate surface is sandwiched between them to obtain a liquid crystal display device. In addition, illustration of the polarizing film, retardation film, and alignment film was abbreviate | omitted.

  The pixel electrode 25 electrically connected to the TFT element 24 has a comb-like pattern made of a transparent conductive film. Although not shown, a common electrode is disposed below the pixel electrode through an insulating layer. The same color filter substrate 21 as that obtained in Example 1 shown in FIG. 1 was used, and the thickness of the liquid crystal layer 23 was set to 3.6 μm.

  In the present embodiment, the color filter substrate 21 has the same film thickness as the light shielding layer and the colored layer, and has no extra protruding structure, so that it can be filled with smooth and uniform liquid crystal, and the image display is extremely homogeneous. It was good. A high-quality liquid crystal display device free from light leakage without any disturbance of the liquid crystal alignment around the colored pixels or at the boundary between the light shielding layer and the display region was obtained.

  Note that when the insulating layer is thin, liquid crystal can be driven through the insulating layer by arched lines of electric force formed between the pixel electrode and the common electrode, and a liquid crystal display device with high transmittance can be obtained. Can be offered. As described above, the present invention does not limit the liquid crystal driving method to the IPS method.

DESCRIPTION OF SYMBOLS 1,11 ... Transparent substrate 2 ... Light-shielding layer 3R ... Red pixel 3G ... Green pixel 3B ... Blue pixel 4, 4 '... Base 5 ... Spacer 5R ... Red Laminated portion 5G ... Green laminated portion 5B ... Blue laminated portion 6 ... Sub-spacer 7 ... Protrusions 8 ... Black matrix 12, 13 ... Colored pixels 21 ... Color filter substrate 22. ..TFT substrate 23... Liquid crystal layer 24... TFT element 25.

Claims (7)

In a color filter substrate in which a light-shielding layer mainly composed of an organic pigment is disposed on the outer periphery of an effective display area on a transparent substrate, and colored pixels formed of three or more colored layers are formed in the effective display area.
A spacer pedestal formed in the effective display area and made of the same material as the light shielding layer and having a film thickness of 0.4 μm or more and 1.0 μm or less thinner than the light shielding layer, and formed on the pedestal A spacer composed of a stack of colored layers of a plurality of colors;
The light-shielding layer contains C.I. I. Pigment red 254, C.I. I. Pigment red 177, C.I. I. Pigment yellow 150, C.I. I. Using a black composition obtained by mixing with Pigment Blue 15: 6,
One of the colored layers is a green colored layer containing zinc halide phthalocyanine as a main coloring material,
The light shielding layer and the film thickness is equal to the colored layer, it and the thickness of the liquid crystal layer when the liquid crystal display device, and the height of the portion projecting on the colored pixels of the spacer formed on the pedestal equal A color filter substrate characterized by. 2. The color filter substrate according to claim 1 , wherein a black matrix made of the same material as the light shielding layer and having a thickness smaller than that of the light shielding layer is disposed in the effective display area. The color filter substrate according to claim 1 or 2 , wherein adjacent portions of the colored pixels are overlapped at an inclined portion of an end portion of each colored pixel. The color filter substrate according to claim 3 , wherein an inclination angle of an end portion of the colored pixel with respect to the transparent substrate surface is 15 ° or more and 40 ° or less. 4. The color filter substrate according to claim 3 , wherein, in the effective display area, a height of a protrusion formed in an overlapping portion of the colored pixels is 0.25 μm or less. 6. The color filter substrate according to claim 1 , wherein a spacer that also serves as a liquid crystal alignment control structure is disposed in the center of the colored pixel in the longitudinal direction in the effective display area. A liquid crystal display device comprising the color filter substrate according to claim 1 .

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