JP2006285014A - Color filter having phase difference control function and display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter which does not cause orientation defect of liquid crystalline polymer constituting a phase difference control function layer and exhibits an excellent phase difference control function, in regard to the color filter having a substrate, a coloring layer composed of black matrix and a plurality of coloring pixels, and a phase difference control function layer composed of the liquid crystalline polymer having fixed orientation in order, and to provide a display which permits high-quality display by mounting the color filter. <P>SOLUTION: In the color filter, edge parts of respective coloring pixels are extended over the black matrix on the coloring layer formed on a substrate and the edge parts of coloring pixels adjacent to each other which are extended on the black matrix do not overlap each other. In the display, a deviation of phase of a liquid crystal layer is satisfactorily adjusted and high-quality display is permitted by mounting the color filter. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a color filter having a phase difference control function and a display using the same, and more particularly to a liquid crystal display or an electroluminescence display excellent in display quality and a color filter used therefor.

  In recent years, various color liquid crystal displays (hereinafter also referred to as “LCD”) have been put into practical use. Here, the LCD has a problem that the viewing angle is narrower than a display equipped with a cathode ray tube. The reason for narrowing the viewing angle of the LCD is that when the LCD is viewed from an oblique direction, light leakage from pixels that should display black originally occurs, contrast is inverted, and correct display cannot be performed. is there. In view of such problems, by using a transparent film having refractive index anisotropy outside the liquid crystal cell (hereinafter referred to as “retardation film”), a wide field of view that does not cause light leakage even when observed from an oblique direction. An angleable LCD has been developed (for example, Patent Document 1).

  The retardation film has been used by being attached to a substrate using an adhesive. However, since the refractive index of the pressure-sensitive adhesive applied to the substrate is different from that of the retardation film, there is a problem that irregular reflection occurs on the display surface. In addition, the retardation film cannot be patterned in accordance with the pixel size of the display, and further has low heat resistance, so there are problems such as changes in optical characteristics due to shrinkage over time.

  Therefore, the present applicant has proposed a phase difference control function layer that can be laminated on an arbitrary layer in a liquid crystal cell and is formed by three-dimensionally cross-linking a liquid crystalline polymer (for example, Patent Document 2). If it is this phase difference control functional layer, since it can be laminated and formed on the base substrate surface, a bonding process using an adhesive is not required, and micropatterning is possible by a photolithography technique. Further, since it is composed of a three-dimensionally cross-linked polymer, it is excellent in heat resistance, and can solve the problems of the conventional retardation film.

  On the other hand, in order to enable a wide viewing angle of the LCD, in addition to the means for widening the viewing angle by controlling (correcting) the phase shift caused by the liquid crystal described above, particularly when the LCD is used for TV applications. The LCD includes a liquid crystal display using a vertical alignment mode (Multi-domain Vertical Alignment mode, hereinafter referred to as “MVA mode”) capable of high-contrast display, and a horizontal alignment mode (In−) with a wide viewing angle and excellent gradation reproducibility. A liquid crystal display by a plain switching mode (hereinafter referred to as “IPS mode”) is widely used (for example, Patent Document 3). These liquid crystal displays are generally mounted with a color filter having a substrate and a colored layer. The colored layer is usually a lattice or stripe black matrix (hereinafter also referred to as “BM”), usually red (hereinafter also referred to as “R”), green (hereinafter also referred to as “G”), It is composed of colored pixels having a light-transmitting pattern made of blue (hereinafter also referred to as “B”).

JP-A-10-153802 JP2005-3750 JP 10-54982 A

By the way, when the phase difference control function layer proposed by the present applicant is provided in a liquid crystal cell of an MVA mode LCD or an IPS mode LCD, particularly when the phase difference control function layer is provided adjacent to the colored layer. Had the following problems.
That is, generally, a photolithography method is applied to form a colored layer in a color filter. Specifically, first, a positive photoresist is applied onto a substrate on which a chromium film or the like is formed, dried, then exposed through a mask, and then the exposed portion is removed by development. Subsequently, by performing an etching process, the chromium film is patterned to form a BM. Subsequently, in order to form a light-transmitting pattern, a negative photoresist is used, and in the same manner as described above, colored pixels such as R, G, and B are sequentially applied by coating, mask exposure, and development processing by photolithography. And patterning to form. When the colored pixels are mask-exposed in the above-described forming method, a certain amount of deviation may occur between the mask opening and the actual exposed portion. The deviation is caused by the alignment accuracy of the aligner used for exposure. When this deviation is large and the BM and each colored pixel adjacent to the BM are formed so as not to overlap with each other, a so-called white portion is generated between the BM end and the colored layer end, and the color purity is large. A problem that degrades occurs. For this reason, it is necessary to form the pattern of each colored pixel corresponding to the BM pattern and avoid the formation of a blank portion. Specifically, there is a method of forming a pattern so that the end of each colored pixel rides on the BM while assuming the shift. Increasing the amount of each colored pixel that rides on the BM by the above method eliminates the problem of the formation of white spots. However, if the colored pixel ends are formed on the BM as described above, the adjacent colored pixels 112R, 112G, and 112B on the BM 111 may overlap on the upper surface of the substrate 110 as shown in FIG. (In FIG. 8, the right end of the colored pixel 112G overlaps the left end of the colored pixel 112B). As a result, a step due to the overlap is formed on the upper surface of the colored layer 117 composed of the BM 111 and each colored pixel. That is, as shown in FIG. 9, a step 116 due to the overlap is formed on the upper surface of the colored layer 117, thereby adversely affecting the alignment characteristics of the liquid crystal in the phase difference control function layer 118 formed next to the upper surface of the colored layer 117. give. The step 116 causes a defect in the alignment of the liquid crystalline polymer 119 that should be regularly aligned in a certain direction, so that accurate optical compensation cannot be performed, and haze is increased, thereby significantly reducing display quality.

  Therefore, the present invention solves the above-described problems, and a colored layer is formed in which no gap is formed between the BM and each of the adjacent colored pixels, and the colored pixels riding on the BM are not overlapped with each other. An object of the present invention is to provide a color filter having a phase difference control function layer composed of a liquid crystalline polymer on the upper surface of the colored layer.

The present invention
(1) A color filter having a substrate, a colored layer, and a phase difference control function layer composed of a liquid crystalline polymer in order, wherein the colored layer has a black matrix and at least two different colors of light transmission A plurality of colored pixels exhibiting a sexual pattern, and the retardation control function layer is laminated on the colored layer as a continuous layer and adjacent on the black matrix. A color filter having a phase difference control function, wherein colored pixels do not overlap,
(2) The color filter having a phase difference control function according to (1), wherein the black matrix has a line width of 6 μm or more and 25 μm or less,
(3) The color filter having a phase difference control function according to (1) or (2), wherein the black matrix is a resin black matrix in which a black pigment is dispersed,
(4) The optical axis of the liquid crystalline polymer constituting the retardation control function layer is perpendicular to the retardation control function layer, according to any one of the above (1) to (3) A color filter having the described phase difference control function,
(5) In any one of the above (1) to (3), the optical axis of the liquid crystalline polymer constituting the retardation control function layer is horizontal to the retardation control function layer A color filter having the described phase difference control function,
(6) The above-mentioned (1) to (5), wherein a different second retardation control functional layer is further laminated on the first retardation control functional layer laminated on the colored layer. A color filter having a phase difference control function according to any one of
(7) A display using a color filter having the phase difference control function according to any one of (1) to (6),
(8) A liquid crystal display using a color filter having a phase difference control function according to any one of (1) to (6), and (9) a position according to any one of (1) to (6) above. An organic electroluminescence display using a color filter having a phase difference control function,
Is a summary.

  The colored layer in the color filter of the present invention is configured not to overlap the colored pixels that run on the BM. Therefore, the liquid crystalline polymer constituting the retardation control function layer laminated on the upper surface of the colored layer does not cause alignment defects due to the steps caused by the overlap. As a result, the color filter of the present invention having the phase difference control function layer has an excellent phase difference control function, and can stably form a high-performance phase difference control function layer in the cell.

  In addition, by setting the BM line width to 6 μm or more and 25 μm or less, it is easy to form the end of each colored pixel on the BM, and it is suitable without overlapping adjacent colored pixels on the BM. It is easy to form with a large interval. Accordingly, it is possible to prevent a gap from being formed between the BM and the colored pixel, and so-called white spot defects can be prevented.

  Moreover, if it is the display of this invention using the said color filter, it is not necessary to stick a phase difference film with an adhesive further, and the irregular reflection by this adhesive which had been a problem conventionally will not be caused. In addition, because the phase difference control function layer composed of a liquid crystalline polymer can control the phase difference of transmitted light satisfactorily, for example, in a liquid crystal display, it is a display with a wide viewing angle and a good display state. In addition, a phase difference control function is not deteriorated even if the display is heated for a long time due to the influence of a backlight or the like.

  Furthermore, the color filter of the present invention can also be applied to an organic electroluminescence display. In other words, the present invention can be applied to a quarter-wave plate for an organic electroluminescence display that constitutes a circularly polarizing plate for the purpose of preventing external light reflection. Here, by setting the line width of the BM within the above preferable range, each colored pixel can be mounted on the BM, and adjacent colored pixels do not overlap each other. Therefore, a high-quality 1 / 4λ wavelength plate can be configured.

  FIG. 1 is a cross-sectional view of a color filter 1a showing an embodiment of the present invention. In the color filter 1a, a black matrix (BM) 11 having a line width of 6 μm in which a position corresponding to a non-colored pixel portion is made of a light-shielding material is laminated on a substrate 10 and corresponds to each opening of the BM 11. A colored layer 13a formed by arranging a colored pixel 12R showing a red pattern that is light transmissive, a colored pixel 12G showing a green pattern, and a colored pixel 12B showing a blue pattern is formed on the position where the light is transmitted. Yes. Each colored pixel is formed by photolithography using a mask designed so that both ends of the colored pixel run on the BM by 1.5 μm. The colored layer 13a in the color filter 1a shown in FIG. 1 is formed by the end portions of the colored pixels 12R, 12G, and 12B formed in the openings between the BMs 11 running on the BM as about 1.5 μm as designed. In addition, one of the pixels riding on the BM 11 does not ride on the other, and a state in which an interval of about 3 μm is left between the end portions.

  FIG. 2 is a cross-sectional view of a color filter 1b showing an embodiment of the present invention. The color filter 1b is formed with the same design as the color filter 1a shown in FIG. 1, but the colored pixel 12G is drawn from the designed position due to the misalignment of the alignment for forming the colored pixel. When viewed from the front side, it is shifted to the right side (colored pixel 12B side) by about 1 μm. However, since the color filter 1b is designed and formed so that the end of each colored pixel rides on the BM by 1.5 μm, the left end of the colored pixel 12G is still formed on the BM. No white space is formed between the BM and the left end of 12G. On the other hand, the right end portion of the colored pixel 12G is formed close to the left end portion of the colored pixel 12B, but both are formed adjacent to each other on the BM at a certain distance without overlapping.

  In the case of the color filters 1a and 1b of the present invention shown in FIGS. 1 and 2, the line width of the BM is formed to be 6 μm, and the end of each colored pixel is designed to run on the BM by 1.5 μm. Therefore, even if the color pixel is formed at a position shifted from the designed position by a maximum of 1.5 μm due to the misalignment, the adjacent color pixels on the BM do not overlap each other.

  In particular, the present invention is a color filter in which a phase difference control function layer composed of a liquid crystalline polymer is formed on the upper surface of the colored layer, so that a step is formed on the upper surface of the colored layer due to overlapping of the end portions of the colored pixels. When this occurs, alignment defects of the liquid crystalline polymer constituting the phase difference control function layer occur, which makes it impossible to obtain high-quality optical compensation and cause display defects. However, in the color filter of the present invention, as described above, the ends of the colored pixels do not overlap on the colored layer. Accordingly, the step due to the overlap is not formed on the upper surface of the colored layer. Therefore, the liquid crystalline polymer constituting the retardation control function layer laminated on the colored layer may cause an alignment defect due to the step. Absent.

  In the BM11 of the present invention, a resin layer in which black pigments such as carbon fine particles are dispersed is formed on the substrate 10, and the resin layer is patterned and formed into a lattice shape or a stripe shape by a photoresist method. be able to.

  Or BM11 can also be comprised from the thin film of a metal or a metal oxide. As the metal or metal oxide, a single layer of Cr, a composite film of a two-layer structure having a laminated structure of CrOx / Cr (x is an arbitrary number, “/” represents a laminated structure), or CrOx / CrNy / Cr ( x and y may be a composite film having a three-layer structure having an arbitrary number of laminated structures. In the BM 11 formed using these metals or metal oxides, a thin film is first formed on the substrate 10 by a method such as vapor deposition, ion plating, or sputtering, and then patterned by photolithography. It can be formed by the method of forming.

  When the BM11 made of a resin layer in which the black pigment is dispersed and the BM11 made of a metal or metal oxide are used in an LCD, respectively, the BM11 made of a resin layer is compared with the BM11 made of a metal or metal oxide, External light reflection from the observation surface can be satisfactorily suppressed. Accordingly, BM11 made of a resin layer is preferable from the viewpoint of providing good display quality in a particularly bright environment. Note that the above-described raw materials and forming methods constituting BM11 are merely examples, and any raw materials and methods may be selected as long as they are known BM raw materials and forming methods. Although the thickness of BM11 is not specifically limited, Generally, it is 0.1 micrometer-3.0 micrometers.

The line width of BM11 in the present invention is preferably 6 μm or more and 25 μm or less, and more preferably 10 μm or more and 20 μm or less. In general, a general-purpose aligner used to laminate the colored pixels 12R, 12G, and 12B in the opening between the BMs 11 has an alignment accuracy of about ± 1.5 μm. As described above, in order to prevent a white spot defect between the BM 11 and the adjacent colored pixels 12R, 12G, and 12M, it is important that the end portions of the respective colored pixels run on the BM 11 and be stacked. In consideration of the accuracy of the general-purpose aligner, it is necessary to design each colored pixel so that the end of the colored pixel is stacked on the BM 11 by about 1.5 μm or more (that is, the colored pixels are colored depending on the accuracy of the aligner). (Even if the position of the end of the pixel is shifted by -1.5 μm from the planned position, it is necessary to have a running width that does not allow a gap between the BM and the colored pixel.)
At this time, if the line width of the BM 11 is less than 6 μm, there is a high possibility that adjacent colored pixels on the BM overlap each other on the BM (that is, the position of the end of the colored pixel is scheduled due to the accuracy of the aligner). Even when the position is deviated by +1.5 μm from the position, the line width is required so that the adjacent colored pixels on the BM do not overlap. Therefore, the line width of the BM 11 is desirably 6 μm or more.
On the other hand, from the viewpoint of preventing overlapping of adjacent colored pixels on the BM 11, it is preferable that the line width of the BM 11 is increased. However, the increase of the line width of the BM 11 decreases the aperture ratio of the colored layer 13. Therefore, when it is mounted on a display, the brightness of the display is reduced. For this reason, it is preferable that the line width of the BM 11 is as narrow as possible within a range where alignment with the opposing substrate is possible. In a normal LCD, the inter-pixel gap on the thin film transistor array facing the color filter substrate is about 4 to 12 μm, and the bonding accuracy is about ± 1 μm. Therefore, from the viewpoint of sufficiently ensuring the brightness of the display, it is preferable to set the line width of the BM 11 to 25 μm or less.

  The colored pixels in the present invention are provided in a pattern formed for each opening of the BM 11 using at least two of arbitrary colors such as R, G, and B. The pattern formation of each colored pixel can be formed by a photolithography method using a photosensitive resin containing a desired colorant. Alternatively, a pattern of colored pixels can be printed using the ink composition. The thickness of the colored pixel is not particularly limited, but is generally 1 μm to 4 μm, and 12R, 12G, and 12B may have the same thickness or different thicknesses. Generally, 12R, 12G, and 12B are formed with the same thickness in order to make the thickness of the liquid crystal layer constant when the panel is formed.

The board | substrate 10 used for this invention can use the board, sheet | seat, or film formed with the transparent inorganic material or the transparent organic material.
Among these, a transparent inorganic material is preferable because it has low thermal expansibility, good dimensional stability, and excellent workability in high-temperature heat treatment. As the transparent inorganic material, glass, silicon, quartz, or the like can be used. In particular, in the case of the color filter of the present invention, which is applied to an LCD, it is preferable to use an alkali-free glass containing no alkali component in the glass.
On the other hand, as the transparent organic material, acrylic such as polymethyl methacrylate, polyamide, polyacetal, polybutylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, triacetyl cellulose, or syndiotactic polystyrene, polyphenylene sulfide, polyether ketone, Polyetheretherketone, fluororesin, polyethernitrile, etc., polycarbonate, modified polyphenylene ether, polycyclohexene, polynorbornene resin, etc., or polysulfone, polyethersulfone, polyarylate, polyamideimide, polyetherimide, or Examples include those made of thermoplastic polyimide, but those made of general plastics are also used. Possible it is. In particular, as the film, a uniaxially or biaxially stretched film, a TAC film having no in-plane retardation, or the like can be used. Although the thickness of the board | substrate 10 is not specifically limited, It is common to set it as about 5 micrometers-1 mm according to a use.

  The liquid crystalline polymer constituting the phase difference control function layer 20 has a liquid crystal state fixed by irradiation with ionizing radiation. Specifically, a liquid crystalline monomer having an unsaturated bond group in the molecular structure is converted into a liquid crystal state. Is a polymer obtained by immobilizing the liquid crystal structure while maintaining the alignment characteristics of the liquid crystal structure. Examples of the three-dimensionally crosslinkable liquid crystalline monomer include liquid crystalline monomers as disclosed in, for example, JP-A-7-258638 and JP-T-10-508882. Examples of such three-dimensionally crosslinkable liquid crystalline monomers include, for example, the compound (I) represented by the following general formula (1) shown in the following [Chemical Formula 1] and the compound (II) exemplified in [Chemical Formula 2] Can be mentioned. As the monomer material constituting the liquid crystalline polymer that can be used in the present invention, one compound or a mixture of two or more of the compounds (I) represented by the general formula (1), [Chemical Formula 2] One compound of compounds (II) exemplified in the above, a mixture of two or more kinds, or a mixture of these can be used.

In the general formula (1) representing the compound (I), R ¹ and R ² each represent hydrogen or a methyl group, but R ¹ and R ² are both hydrogen due to the wide temperature range showing the liquid crystal phase. Is preferred. X may be hydrogen, chlorine, bromine, iodine, an alkyl group having 1 to 4 carbon atoms, a methoxy group, a cyano group, or a nitro group, but is preferably a chlorine or methyl group. Moreover, a and b which show the chain length of the alkylene group which is a spacer with the (meth) acryloyloxy group of the molecular chain both ends of a compound (I), and an aromatic ring are respectively arbitrary integers in the range of 2-12. Although it can take, it is preferable that it is the range of 4-10, and it is more preferable that it is the range of 6-9. The compound of the general formula (1) in which a = b = 0 is poor in stability, easily subjected to hydrolysis, and the compound itself has high crystallinity. In addition, the compound of the general formula (1) in which a and b are each 13 or more has a low isotropic transition temperature (TI). For this reason, both of these compounds are not preferable because the temperature range showing liquid crystallinity becomes narrow. The above-described three-dimensionally crosslinkable compounds are all polymerizable liquid crystal monomers capable of taking nematic regularity. In the present invention, conventionally proposed polymerizable liquid crystal oligomers and polymerizable liquid crystals exhibiting nematic alignment regularity. A polymer can be appropriately selected and used.

  In order to form the retardation control function layer 20 in the present invention, a chiral agent may be added to the above-described nematic alignment polymerizable liquid crystal. The chiral nematic liquid crystal having cholesteric regularity obtained as described above can be suitably used as the liquid crystal constituting the phase control function layer 20. In the present invention, the chiral agent is used when forming a negative C plate, which will be described later, in the retardation control function layer composed of a liquid crystalline polymer.

  As the chiral agent that can be used in the present invention, the compound described in the compound (I) included in the general formula (1) of [Chemical Formula 1] or the compound (II) exemplified in [Chemical Formula 2] is expressed. Used to induce helical pitch in positive uniaxial nematic regularity. Therefore, it is important that the compound has an optically active site in the molecule. Specifically, a compound having one or more asymmetric carbons, a compound having an asymmetric point on a hetero atom such as a chiral amine or chiral sulfoxide, or an axial asymmetry such as cumulene or binaphthol. The compound which has is mentioned. For example, commercially available chiral nematic liquid crystal, more specifically, S-811 manufactured by Merck Co., etc. can be used. Moreover, it is preferable that the molecular weight of the chiral agent to be used is 1500 or less.

  Depending on the properties of the selected chiral agent, the nematic regularity formed by the liquid crystalline compound may be destroyed, the orientation may be lowered, and the like. In addition, the use of a large amount of a chiral agent having an optically active site increases the cost of the liquid crystal material composition. Accordingly, as the chiral agent used in the present invention, it is preferable to select a chiral agent having a large effect of inducing a helical pitch in the alignment of the liquid crystalline polymer. Specifically, the chiral agent represented by the general formula (2) described in [Chemical Formula 3] ) To (4), which are preferably low molecular compounds having axial asymmetry in the molecule.

In the general formulas (2) to (4) shown in the above [Chemical Formula 3], R ⁴ represents hydrogen or a methyl group. Y is any one of (i) to (xxiv) shown in [Chemical Formula 4] and [Chemical Formula 5], and among them, in formulas (i), (ii), (iii), (v) and (vii) Any one of them is preferable. Moreover, it is more preferable that c and d which show the long chain of an alkylene group are the range of 2-12 individually, respectively. A compound in which the value of c or d is 0 or 1 lacks stability, is susceptible to hydrolysis, and has high crystallinity. On the other hand, a compound having a value of c or d of 13 or more has a low melting point (Tm). As a result, when a compound in which the values of c and d are outside the above preferred range is used as a chiral agent, the compatibility with the liquid crystalline monomer material exemplified by compound (I) or compound (II) decreases, and depending on the concentration There is a risk of phase separation and the like.

  The chiral agent used in the present invention does not necessarily have polymerizability. However, in consideration of the thermal stability of the obtained retardation control function layer, a polymerizable chiral agent that can be polymerized with the above-described three-dimensionally crosslinkable liquid crystalline monomer material to fix cholesteric regularity. Is preferably used. In particular, it is preferable to have a polymerizable functional group at both ends of the molecule in order to obtain a phase control layer having good heat resistance.

  If the chiral agent is represented by the general formulas (2) to (4) described above, it is possible to satisfactorily form a retardation control function layer having a short pitch cholesteric regularity. However, the chiral agent used in the present invention is not limited to the above. It is compatible with the above compound (I) or the above compound (II) in a solution state or in a molten state, and without impairing the liquid crystal property of the liquid crystal polymer, the positive uniaxial nematic regularity expressed by the liquid crystal polymer is obtained. Any agent capable of inducing a helical pitch can be used as the chiral agent of the present invention.

  The amount of the chiral agent blended in the three-dimensionally crosslinkable liquid crystal monomer material of the present invention depends on the amount of the liquid crystal polymer material used, the helical pitch inducing ability and the finally obtained polarization selective reflection layer (ie, phase difference). It can be determined appropriately in consideration of the cholesteric properties of the control function layer. In particular, in relation to the amount of the liquid crystal monomer material used, 0.01 to 60 parts by weight, preferably 0.1 to 40 parts by weight, and more preferably 0.8 to 100 parts by weight of the total amount of the liquid crystal monomer material. It is preferable that the amount of the chiral agent is determined in the range of 5 to 30 parts by weight, most preferably 1 to 20 parts by weight. When the blending amount of the chiral agent with respect to 100 parts by weight of the liquid crystalline monomer material is less than 0.01 parts by weight, sufficient cholesteric properties may not be imparted to the liquid crystalline monomer material. The alignment of the liquid crystalline monomer material is hindered, and when the retardation control function layer 20 is formed, there is a possibility of adverse effects when the alignment is fixed by active radiation such as ultraviolet rays.

  The retardation control function layer 20 according to the present invention is formed by fixing the alignment structure of the above-described three-dimensionally crosslinkable liquid crystalline monomer while maintaining the alignment of the liquid crystal state. Specifically, the retardation layer made of the liquid crystalline polymer has an optical axis perpendicular to the substrate and has negative birefringence anisotropy (hereinafter also referred to as “negative C plate”), the liquid crystalline Retardation layer (hereinafter, also referred to as “positive C plate”) having a positive birefringence anisotropy with an optical axis of a retardation layer made of a polymer perpendicular to the substrate, or a retardation made of the liquid crystalline polymer A retardation layer (hereinafter also referred to as “positive A plate”) having a positive birefringence anisotropy with the optical axis of the layer being horizontal to the substrate can be used. In the present invention, the term “C plate” is used to include both “negative C plate” and “positive C plate”. In the present invention, the term “A plate” is used in the same meaning as “positive A plate”. A method for forming the A plate and the C plate using the liquid crystalline polymer on the colored layer will be described below.

  In order to produce a positive A plate in the present invention, it is necessary to nematically align the liquid crystalline polymer constituting the retardation control function layer 20 in the horizontal direction with respect to the substrate surface. Specifically, first, a horizontal alignment film that promotes horizontal alignment is formed on the upper surface of the colored layer 13, and a resin composition containing a three-dimensionally crosslinkable liquid crystalline monomer is applied to the upper surface of the horizontal alignment film and heated. Then, the liquid crystal monomer is promoted to be horizontally aligned, and then the aligned liquid crystal monomer is photopolymerized by irradiating active radiation such as ultraviolet rays. As a result, it is possible to form a phase difference control functional layer in which the liquid crystalline polymer is three-dimensionally cross-linked in a state of being aligned in the horizontal direction with respect to the substrate and the alignment is fixed.

The horizontal alignment film is a roller or the like in which a solution in which a resin such as polyamide resin or polyimide resin is dissolved is applied on a colored layer and dried to form a coating film, and then a cloth is wound around the upper surface of the coating film. It can be formed by performing a rubbing process that rubs in a predetermined direction. The thickness of the alignment film is not particularly limited, but is generally 0.01 μm to 0.08 μm.
On the other hand, the resin composition applied on the horizontal alignment film is composed of one or more compounds (I) or compounds (II) exemplified above, a photopolymerization initiator, and a polymerization inhibitor as necessary. Etc. can be prepared by dissolving them in an organic solvent. Although the thickness after drying of the resin composition in a positive A plate is not specifically limited, It is common to set it as 0.1 micrometer-2.0 micrometers.

  In the present invention, for the negative C plate, a resin composition obtained by adding the chiral agent exemplified in [Chemical Formula 3] to the resin composition used when forming the positive A plate is directly applied to the colored layer 13. It can be prepared by applying and heating to promote alignment of the liquid crystalline monomer, and then photopolymerizing the aligned liquid crystalline monomer by irradiation with light radiation such as ultraviolet rays. By adding the chiral agent, twist can be induced in the alignment of the liquid crystalline monomer, and the alignment of the liquid crystal molecules having a helical structure can be defined. Then, the liquid crystalline monomer that is oriented in a spiral (that is, chiral nematic orientation) is three-dimensionally cross-linked to form a retardation control function layer composed of a liquid crystal polymer in which the orientation is fixed. Alternatively, a horizontal alignment film may be formed in advance on the upper surface of the colored layer 13 before the resin composition containing the chiral agent is applied on the colored layer 13. In this way, by forming a horizontal alignment film and applying a chiral agent-containing resin composition on the upper surface thereof, the helical alignment is regularly started, and a more undisturbed alignment can be defined. preferable. Although the thickness after drying of the resin composition in a negative C plate is not specifically limited, It is common to set it as 1.0 micrometer-7.0 micrometers.

  In order to produce a positive C plate, it is necessary to nematically align the liquid crystalline polymer constituting the retardation control function layer 20 in the direction perpendicular to the substrate surface on the colored layer 13. Specifically, first, a vertical alignment film is formed on the upper surface of the colored layer 13, and a resin composition containing a liquid crystal monomer capable of three-dimensional crosslinking is applied on the upper surface of the vertical alignment film and heated to promote vertical alignment. Subsequently, it photopolymerizes in the state of vertical alignment by irradiating active rays, such as an ultraviolet-ray. As a result, it is possible to form a phase difference control function layer in which the liquid crystalline monomer is three-dimensionally crosslinked in a state in which the liquid crystal monomer is aligned in a direction perpendicular to the substrate and the alignment is fixed.

As the vertical alignment film, a vertical alignment film formed of a surfactant having a long chain alkyl group, a vertical alignment film formed of polyimide having a long chain alkyl group, or a vertical alignment film formed of a coupling agent Can be used. Further, a commercially available vertical alignment film generally used for a driving liquid crystal layer of a vertical alignment type (MVA: Multi-domain Vertical Alignment method) LCD may be used. Examples of commercially available vertical alignment films include JALS-2021-R2 (manufactured by JSR Corporation), SE-1211 (manufactured by Nissan Chemical Industries, Ltd.), SE-7511 (Nissan Chemical Industries, Ltd.), and the like. Can be mentioned. The thickness of the vertical alignment film is not particularly limited, but is generally 0.01 μm to 0.08 μm.
On the other hand, the resin composition applied on the vertical alignment film can be the same as the resin composition that can be used for the positive A plate described above. In addition, you may further add the component which comprises the vertical alignment film employ | adopted, ie, surfactant, a silane coupling agent, or the vertical alignment film component for MVA to the said resin composition. It is preferable to add the vertical alignment film component to the resin composition because the affinity between the vertical alignment film and the resin composition is further improved and the vertical alignment can be more strictly performed. Although the thickness after drying of a resin composition is not specifically limited, It is common to set it as 0.5 micrometer-3.0 micrometers.

  The color filter 1 of the present invention using the phase difference control function layer 20 made of the above-described C plate or A plate will be described with reference to FIGS. The color filter 1 of the present invention shown in FIG. 3 is formed by laminating a colored layer 13 on the upper surface of a substrate 10 and then laminating a phase difference control function layer 20a formed by forming a negative C plate on the upper surface of the colored layer 13. can do.

  The color filter 1 of the present invention shown in FIG. 4 has a phase difference control function layer 20b formed by forming a positive A plate in place of the phase difference control function layer 20a formed in the color filter 1 shown in FIG. Can be formed.

  The color filter 1 of the present invention shown in FIG. 5 has a phase difference control function layer 20c formed by laminating a colored layer 13 on the upper surface of a substrate 10 and then forming a positive C plate on the upper surface of the colored layer 13. A phase difference control function layer 20b formed by forming a positive A plate on the upper surface of the phase difference control function layer can be stacked as a second phase difference control function layer. As described above, when a different second phase difference control function layer is laminated on the upper surface of the first phase difference control function layer, an alignment film is formed on the upper surface of the first phase difference control function layer, and then the liquid crystal The second phase difference control function layer can be formed by applying a resin composition containing a functional polymer, and aligning and fixing the resin composition. Alternatively, in the case of a retardation control function layer that does not require an alignment film, a liquid crystal polymer-containing resin composition is applied to the top surface of the retardation control function layer that is first laminated, aligned, fixed, and fixed. Two phase difference control functional layers can be formed.

  In the color filter 1 of the present invention shown in FIG. 6, a phase difference control function layer 20 b formed by forming a positive A plate is laminated on the upper surface of the substrate 10, and then the colored layer 13 is formed on the upper surface of the phase difference control function layer 20 b. Further, a retardation control function layer 20c formed by forming a positive C plate on the upper surface of the colored layer 13 can be laminated.

  Although not shown in the figure, in the color filter 1 shown in FIGS. 3 to 6, the positive C plate 20c, the negative C plate 20a, or the positive A plate 20b constituting the phase difference control function layer 20 is Each can be replaced or replaced.

  The color filter 1 of the present invention is formed by laminating a retardation control function layer 20 composed of a liquid crystalline polymer having a fixed orientation using a three-dimensionally crosslinkable liquid crystalline monomer on the upper surface of the colored layer 13. Therefore, compared with a retardation film that has been used by pasting a polarizing film or the like with an adhesive, the step of pasting can be omitted, and the refractive index of the adhesive is different from that of the retardation film or the like. It is excellent in that the irregular reflection caused can be prevented. In addition, the thickness of the conventional retardation film including the base material is about 50 μm to 100 μm. However, if the retardation control function layer 20 in the present invention is used, the thickness can be 10 μm or less per layer. This is effective for reducing the film thickness. Furthermore, since the liquid crystalline polymer constituting the retardation control function layer 20 in the present invention is formed by three-dimensionally cross-linking and fixing a liquid crystalline monomer, it has superior heat resistance compared to conventional retardation films and is suitable for display. When mounted, changes in phase difference due to shrinkage over time can be suppressed.

  The color filter 1 of the present invention described above can be mounted on a display such as an LCD or an organic electroluminescence display.

  FIG. 7 is a cross-sectional view showing an embodiment of the configuration of a transmission type liquid crystal display using the color filter 1 of the present invention.

  In the liquid crystal display 2 shown in FIG. 7, the upper side of the figure is the observation side, and from the observation side, the polarizing plate 24, the substrate 10, the colored layer 13, the phase difference control function layer 20b, the phase difference control function layer 20a, and the counter electrode The layer 23, the liquid crystal layer 21, the pixel electrode layer 22, the substrate 10, and the polarizing plate 24 are laminated in this order. The pixel electrode layer 22 includes a pixel electrode 22a patterned to face each colored pixel located above, an operation line 22c, an insulating layer 22d that isolates the pixel electrode 22a and the operation line 22c, and a liquid crystal The protective layer 22b is located between the layer 15 and the protective layer 22b. The color filter 1 including the substrate 10, the colored layer 13, the phase difference control function layer 20a, and the phase difference control function layer 20b is the color filter 1 of the present invention described above, and a phase difference formed by forming a negative C plate. The color filter includes a control function layer 20a and a phase difference control function layer 20b formed by forming a positive A plate.

  The liquid crystal display of the present invention illustrated in FIG. 7 is formed using the color filter 1 having the phase difference control function of the present invention. Therefore, there is no step due to the overlap of the colored pixels on the upper surface of the colored layer 13 in the color filter 1. For this reason, the liquid crystalline polymer constituting the subsequently formed retardation control function layer 20a and retardation control function layer 20b can be well aligned, and the phase shift generated in the liquid crystal layer 21 can be controlled well. A display with an enlarged field of view can be realized. Also, unlike the conventional liquid crystal display that controls the shift of the phase difference by the retardation film that is attached to the polarizing plate, the liquid crystal display of the present invention is formed by laminating the retardation control function layer in the color filter. Therefore, there is no need to attach a retardation film to the polarizing plate using an adhesive as in a liquid crystal display, and irregular reflection of light by the adhesive does not occur.

  The liquid crystal display shown in FIG. 7 is an example of the display of the present invention and does not limit the present invention. Therefore, a layer or a structure necessary for configuring the liquid crystal display may be provided as appropriate. For example, an alignment layer can be provided adjacent to both surfaces of the liquid crystal layer (not shown). The display of the present invention may be, for example, a display using the color filter of the present invention for a transmissive liquid crystal display, or a display using the color filter of the present invention for an organic electroluminescence display. Good. Furthermore, the color filter of the present invention used for these displays is not limited to the color filter shown in FIG. 7, and the color filters in the various embodiments described above can be appropriately employed.

  Embodiments according to the present invention will be described in detail below.

(Pretreatment of substrate)
Appropriate cleaning treatment was performed, and a glass substrate (1737 material, manufactured by Corning) was prepared as a cleaned substrate. In this embodiment, a glass substrate is used as the substrate. However, the present invention is not limited to the glass substrate, and the substrates made of the various materials described above can be used, for example, polycarbonate, polymethyl methacrylate. Further, a plastic substrate made of polyethylene terephthalate, triacetyl cellulose, or the like may be used, or a film of polyethersulfone, polysulfone, polypropylene, polyimide, polyamideimide, polyetherketone, or the like may be used.
(Coloring resist adjustment)
A pigment-dispersed photoresist was used as a coloring material for the black matrix and red (R), green (G), and blue (B) colored pixels. A pigment dispersion type photoresist uses a pigment as a coloring material, adds beads to a dispersion composition (containing a pigment, a dispersant, and a solvent), disperses for 3 hours with a disperser, and then removes the beads. A clear resist composition (containing polymer, monomer, additive, initiator and solvent) is mixed. Its composition is shown below. A paint shaker was used as the disperser.

The composition of each photoresist is shown below.

(Photoresist for black matrix)
・ Black pigment: 14.0 parts by weight (TM Black # 95550 manufactured by Dainichi Seika Kogyo Co., Ltd.)
・ Dispersant: 1.2 parts by weight (Disperbyk 111 manufactured by Big Chemie Co., Ltd.)
・ Polymer 2.8 parts by weight (VR60 manufactured by Showa Polymer Co., Ltd.)
・ Monomer: 3.5 parts by weight (SR399, manufactured by Sartomer)
・ Additive: 0.7 parts by weight (L-20 manufactured by Soken Chemical Co., Ltd.)
Initiator: 1.6 parts by weight (2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1)
・ Initiator: 0.3 parts by weight (4,4′-diethylaminobenzophenone)
・ Initiator: 0.1 parts by weight (2,4-diethylthioxanthone)
・ Solvent: 75.8 parts by weight (ethylene glycol monobutyl ether)

(Photoresist for red (R) colored pixels)
・ Red pigment: 3.5 parts by weight (CIPR254 (Chromophthal DPP Red BP manufactured by Ciba Specialty Chemicals))
・ Yellow pigment: 0.6 parts by weight (CI PY139 (PASFOL Yellow D1819 manufactured by BASF))
・ Dispersant: 3.0 parts by weight (Solsparse 24000 manufactured by Zeneca)
-Monomer: 4.0 parts by weight (SR399 manufactured by Sartomer Co., Ltd.)
-Polymer 1 ... 5.0 parts by weight-Initiator ... 1.4 parts by weight (Irgacure 907 manufactured by Ciba Geigy)
Initiator: 0.6 parts by weight (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole)
・ Solvent: 81.9 parts by weight (propylene glycol monomethyl ether acetate)

(Photoresist for green (G) colored pixels)
Green pigment: 3.7 parts by weight (CI PG7 (Seika Fast Green 5316P manufactured by Dainichi Seika))
・ Yellow pigment: 2.3 parts by weight (CI PY139 (PASFOL Yellow D1819 manufactured by BASF))
・ Dispersant: 3.0 parts by weight (Solsparse 24000 manufactured by Zeneca)
-Monomer: 4.0 parts by weight (SR399 manufactured by Sartomer Co., Ltd.)
-Polymer 1 ... 5.0 parts by weight-Initiator ... 1.4 parts by weight (Irgacure 907 manufactured by Ciba Geigy)
Initiator: 0.6 parts by weight (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole)
・ Solvent: 80.0 parts by weight (propylene glycol monomethyl ether acetate)

(Blue (B) colored pixel photoresist)
Blue pigment: 4.6 parts by weight (CI PB15: 6 (BASF Heliogen Blue L6700F))
・ Purple pigment: 1.4 parts by weight (CI PV23 (Clariant Foster Palm RL-NF))
・ Pigment derivative: 0.6 parts by weight (Solsperse 12000 manufactured by Zeneca)
・ Dispersant: 2.4 parts by weight (Solsparse 24000 manufactured by Zeneca Corporation)
-Monomer: 4.0 parts by weight (SR399 manufactured by Sartomer Co., Ltd.)
-Polymer 1 ... 5.0 parts by weight-Initiator ... 1.4 parts by weight (Irgacure 907 manufactured by Ciba Geigy)
Initiator: 0.6 parts by weight (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole)
・ Solvent: 80.0 parts by weight (propylene glycol monomethyl ether acetate)

  In addition, the polymer 1 described in this specification is a copolymer 100 of benzyl methacrylate: styrene: acrylic acid: 2-hydroxyethyl methacrylate = 15.6: 37.0: 30.5: 16.9 (molar ratio). 2-Methacryloyloxyethyl isocyanate is added 16.9 mol% with respect to mol%, and the weight average molecular weight is 42500.

  A liquid crystalline polymer-containing resin composition constituting the retardation control function layer was prepared as follows.

(Preparation of resin composition for retardation control function layer having negative C plate)
75 parts by weight of a liquid crystalline monomer material having a polymerizable acrylate group at both ends as a three-dimensionally crosslinkable liquid crystalline monomer material constituting a negative C plate and having a spacer between the mesogen at the center and the acrylate 1 part by weight of Irgacure Irg184 (manufactured by Ciba Specialty Chemicals) as a photopolymerization initiator, 25 parts by weight of toluene as a solvent, and 7 parts by weight of a chiral agent having polymerizable acrylate groups at both ends as a chiral agent In addition, a resin composition was prepared.

(Preparation of resin composition for retardation control function layer having positive C plate)
The resin composition for a retardation control function layer having a positive C plate was prepared in the same manner as the above-described negative C plate resin composition except that no chiral agent was added.

(Preparation of resin composition for retardation control function layer having positive A plate)
A resin composition for a retardation control function layer having a positive A plate was prepared in the same manner as the negative C plate resin composition described above, except that no chiral agent was added.

Example 1
The BM photoresist prepared as described above is applied to the top surface of the glass substrate cleaned by the pretreatment to a thickness of 1.2 μm by spin coating, and prebaked at 90 ° C. for 3 minutes to form a predetermined pattern. The film was exposed using a mask (100 mJ / cm ² ), followed by spray development using a 0.05% KOH aqueous solution for 60 seconds, followed by post-baking at 200 ° C. for 30 minutes to have a BM with a line width of 6 μm. A BM substrate was produced.
Next, a red (R) pigment-dispersed photoresist is applied onto the BM substrate by spin coating, pre-baked at 80 ° C. for 5 minutes, and alignment exposure is performed using a predetermined colored pattern photomask. (300 mJ / cm ² ). An aligner MA6700 manufactured by Dainippon Kaken was used for the exposure. At this time, a photomask designed in advance so that the amount of the end of the red colored pixel that rises on the adjacent BM is 1.5 μm was used. Subsequently, spray development using a 0.1% KOH aqueous solution was performed for 60 seconds, followed by post-baking at 200 ° C. for 60 minutes, and a red (R) colored pixel pattern having a film thickness of 2.8 μm at a predetermined position with respect to the BM pattern. Formed.
Subsequently, a green (G) colored pixel pattern having a film thickness of 2.6 μm was formed under the same method and conditions as the method for forming the red (R) colored pixel pattern.
Further, a blue (B) colored pixel pattern having a film thickness of 2.3 μm was formed under the same method and conditions as the method for forming the red (R) colored pixel pattern.
As described above, a colored layer composed of BM, red colored pixels, green colored pixels, and blue colored pixels was formed on the substrate. In the colored layer, the end portions of the red colored pixel, the green colored pixel and the blue colored pixel are formed on the BM, and the adjacent colored pixels on the BM are formed without overlapping. It was. Therefore, no step due to the overlap of the colored pixels on the BM occurred on the upper surface of the colored layer.

A retardation control function layer having a negative C plate was produced on the colored layer laminated on the substrate. First, AL1254 (manufactured by JSR) was used as an alignment film material, and the alignment film was patterned on the upper surface of the colored layer by flexographic printing to form an alignment film having a thickness of 700 mm. And the resin composition prepared for negative C plate formation was apply | coated to the thickness of 2.4 micrometers by the spin-coating method on the said alignment film upper surface. In this example, the spin coating method was adopted as a method of applying the resin composition, but the application method of the resin composition is not limited to this, and for example, die coating, slit coating, and a combination of these methods are appropriately used. You can choose. The same applies to the embodiments described below. Subsequently, the substrate coated with the resin composition was heated on a hot plate at 100 ° C. for 5 minutes to remove the residual solvent and to align the liquid crystalline polymer contained in the resin composition. The retardation layer at the end face portion of the substrate can be removed by a known method, for example, edge rinse.
Subsequently, ultraviolet irradiation was performed under conditions of 10 J / cm ² and 365 nm to cure the liquid crystalline polymer. That is, a phase difference control function layer made of a liquid crystalline polymer in which the liquid crystalline monomer material was aligned and three-dimensionally crosslinked and fixed in that state was formed. Furthermore, it heated for 10 minutes on a 200 degreeC hotplate, the curing reaction was complete | finished, and the color filter of Example 1 was formed.

(Example 2)
Example 1 is the same as Example 1 except that a phase difference control function layer having a positive C plate is formed as an alternative to the phase difference control function layer having a negative C plate formed on the upper surface of the colored layer. The color filter of Example 2 was formed by the method and conditions described above.
In forming a phase difference control function layer having a positive C plate, first, DMAOP was used as an alignment film material, and an alignment film having a thickness of 700 mm was formed on the colored layer by patterning the alignment film by flexographic printing. . And the resin composition prepared for positive C plate formation was apply | coated to the thickness of 1.6 micrometers by the spin-coating method on the said alignment film upper surface. As in Example 1, the colored layer in Example 2 is formed such that the ends of the colored pixels run on the BM, and no overlap is observed between the ends of the adjacent colored pixels on the BM. It was. Therefore, no step due to the overlap of the colored pixels on the BM occurred on the upper surface of the colored layer.
In Example 2, the resin composition prepared for forming the positive C plate was prepared in the same manner as the resin composition used in Example 1 except that no chiral agent was added.

(Example 3)
Example 1 is the same as Example 1 except that a phase difference control function layer having a positive A plate is formed as an alternative to the phase difference control function layer having a negative C plate formed on the upper surface of the colored layer. The color filter of Example 3 was formed by the method and conditions described above. As in Example 1, the colored layer in Example 3 is formed such that the ends of the colored pixels run on the BM, and no overlap is observed between the ends of the adjacent colored pixels on the BM. It was. Therefore, no step due to the overlap of the colored pixels on the BM occurred on the upper surface of the colored layer.
In Example 3, the resin composition prepared for forming the positive A plate was prepared in the same manner as the resin composition used in Example 1 except that no chiral agent was added.

(Comparative Examples 1-3)
A BM substrate was formed by the same method and conditions as in Example 1 except that the line width of BM was 5 μm. Next, in the same manner as in Example 1, each colored pixel was formed by designing the end portions of the red colored pixel, the green colored pixel, and the blue colored pixel to run on the BM by 1.5 μm. Due to the misalignment of the aligner used for patterning each colored layer, a part of the end portion between the adjacent colored pixels on the BM was formed to overlap. Therefore, a step due to the overlap of the colored pixels on the BM occurred on the upper surface of the colored layer.

  Next, a color filter in which a negative C plate is formed as a phase difference control function layer is formed on the colored layer in which the steps due to the overlap between the colored pixels are partially generated in the same manner as in Example 1. As in Comparative Example 1, a color filter having a positive C plate formed as a phase difference control function layer as in Example 2 was formed as Comparative Example 2, and as in Example 3, a positive A plate was used as a phase difference control function layer. A color filter formed with a plate was formed as Comparative Example 3.

(Comparative Example 4)
A BM substrate was formed by the same method and conditions as in Example 1 except that the line width of BM was 30 μm. Next, in the same manner as in Example 1, each colored pixel was formed by designing the ends of the red colored pixel, the green colored pixel, and the blue colored pixel so as to run on the BM by 1.5 μm. In the colored layer, the end portions of the red colored pixel, the green colored pixel and the blue colored pixel are formed on the BM, and the adjacent colored pixels on the BM are formed without overlapping. It was. Therefore, no step was caused due to the overlap of the colored pixels on the BM.

  Next, a color filter in which a negative C plate was formed as a retardation control function layer was formed on the colored layer in the same manner as in Example 1 to obtain Comparative Example 4.

Example 4
As a liquid crystal display using Example 1, a liquid crystal display 1 by the MVA mode method was produced as described below, and Example 4 was obtained.

A transparent common electrode made of indium tin oxide (ITO) was formed on the upper surface of the phase difference control function layer in the color filter of Example 1 having a negative C plate. On the other hand, thin film transistors (TFTs) are formed on a plurality of predetermined locations on the glass substrate described above, and transparent pixel electrodes are formed of indium tin oxide (ITO) so as to be connected to the drain electrodes of the respective TFTs. Produced.
Next, a solution obtained by diluting a vertical alignment film solution (JALS-20210-R2) with γ-butyrolactone to 50% so as to cover the transparent common electrode surface and the transparent pixel electrode surface is applied and dried to form an alignment film (thickness). 0.07 μm) was formed. Next, both substrates are made to face each other so that these alignment films face each other, the space between both substrates is sealed with a sealing member, and liquid crystal (MLC-6608 manufactured by Merck Japan) is injected into the sealed space. Was sealed to prepare a liquid crystal display.

(Example 5)
As a liquid crystal display using Example 2, a liquid crystal display by an IPS mode method was produced as follows and used as an example.

The color filter of Example 2 having a positive C plate was formed. On the other hand, thin film transistors (TFTs) are formed on a plurality of predetermined locations on the glass substrate described above, and comb-like transparent pixel electrodes are formed of indium tin oxide (ITO) so as to be connected to the drain electrodes of the respective TFTs. An electrode substrate was produced.
Next, a polyimide resin paint was applied so as to cover the top surface of the retardation control function layer and the transparent pixel electrode surface in the color filter, dried, and rubbed to form an alignment film (thickness 0.07 μm). Next, the two substrates are made to face each other such that these alignment films face each other, the space between both the substrates is sealed with a sealing member, and liquid crystal (MLC-6846-000 manufactured by Merck Japan) is injected into the sealed space, The inlet was sealed to produce a liquid crystal display.

(Comparative Example 5)
A liquid crystal display according to the MVA mode method was produced as Comparative Example 5 in the same manner as in Example 4 except that Comparative Example 1 was used.

(Comparative Example 6)
A liquid crystal display by the IPS mode method was produced as Comparative Example 6 in the same manner as Example 5 except that Comparative Example 2 was used.

(Comparative Example 7)
A liquid crystal display according to the MVA mode method was produced as Comparative Example 7 in the same manner as in Example 4 except that Comparative Example 4 was used.

(Evaluation)
In each of the liquid crystal displays of Examples 4 and 5 and Comparative Examples 5 to 7, the same images were displayed for the same time, and the display states were evaluated by the following evaluation methods. As a result, as shown in Table 1, the display state of the liquid crystal display of Example 4 equipped with the color filter of Example 1 and Example 5 equipped with the color filter of Example 2 was subjected to high-quality optical compensation. The front contrast was good. Further, the aperture ratio of the colored layer was sufficiently maintained, and the brightness of the display was not impaired.
On the other hand, the display state of the liquid crystal display of Comparative Example 5 equipped with the color filter of Comparative Example 1 and Comparative Example 6 equipped with the color filter of Comparative Example 1 caused light leakage due to poor alignment of liquid crystal molecules. As a result, good display quality could not be obtained.
In the display state of the liquid crystal display of Comparative Example 7 on which the color filter of Comparative Example 4 was mounted, the luminance decreased due to a decrease in the aperture ratio.

(Table 1)

(Evaluation methods)
The brightness was measured by using a spectral brightness meter SR-3 manufactured by Topcon Corporation and the white display brightness of each display.
Similarly, the front contrast was obtained by measuring the luminance of each display during black display and calculating the white display luminance / black display luminance.

* 1 Front contrast ○: The measured value is 500 or more, and the display quality is very good.
X: The measured value is less than 500, and insufficient contrast is observed.

* 2 Luminance ○: The measured value is 500 cd / m ² or more, and sufficient luminance for display display is obtained.
X: The measured value is less than 500 cd / m ² , and sufficient luminance in display display cannot be obtained.

It is sectional drawing which shows one embodiment of the color filter of this invention. It is sectional drawing which shows one embodiment of the color filter of this invention. It is a disassembled perspective view which shows one embodiment of the color filter of this invention. It is a disassembled perspective view which shows one embodiment of the color filter of this invention. It is a disassembled perspective view which shows one embodiment of the color filter of this invention. It is a disassembled perspective view which shows one embodiment of the color filter of this invention. It is sectional drawing which shows one embodiment of the liquid crystal display of this invention. It is explanatory drawing which shows the problem of the conventional color filter. It is explanatory drawing which shows the problem of the conventional color filter.

Explanation of symbols

1, 1a, 1b Color filter of the present invention 2 Liquid crystal display of the present invention 10 Substrate 11 Black matrix 12, 12R, 12G, 12B Colored pixels 13, 13a, 13b, 13c Color filter layer 20 Phase difference control function layer 20a Negative C Phase difference control function layer 20b formed using a plate Phase difference control function layer 20c formed using a positive A plate Phase difference control function layer 21 formed using a positive C plate Liquid crystal layer 22 Pixel electrode Layer 22a Pixel electrode 22b Protective layer 22c Operation line 22d Insulating layer 23 Counter electrode layer 24 Polarizing plate 110 Substrate 111 Black matrix 112R, 112G, 112B Colored pixel 115 White spot 116 Step 117 Colored layer 118 Phase difference control function layer 119 Liquid crystal High molecular

Claims (9)

  A color filter having a substrate, a colored layer, and a phase difference control function layer composed of a liquid crystalline polymer in order, wherein the colored layer has a black matrix and at least two different light-transmitting patterns. The phase difference control function layer is laminated on the color layer as a continuous layer, and the color pixels adjacent on the black matrix are arranged. A color filter having a phase difference control function characterized by not overlapping.   The color filter having a phase difference control function according to claim 1, wherein the black matrix has a line width of 6 μm to 25 μm.   The color filter having a phase difference control function according to claim 1 or 2, wherein the black matrix is a resin black matrix in which a black pigment is dispersed.   The color having a phase difference control function according to claim 1, wherein an optical axis of the liquid crystalline polymer constituting the phase difference control function layer is perpendicular to the phase difference control function layer. filter.   The color having a phase difference control function according to claim 1, wherein an optical axis of the liquid crystalline polymer constituting the phase difference control function layer is horizontal with respect to the phase difference control function layer. filter.   The phase difference control according to claim 1, wherein a different second phase difference control functional layer is further laminated on the first phase difference control functional layer laminated on the colored layer. Color filter with function.   A display using the color filter having the phase difference control function according to claim 1.   A liquid crystal display using the color filter having the phase difference control function according to claim 1. The organic electroluminescent display using the color filter which has a phase difference control function of Claims 1-6.

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