JPH1039291A - Liquid crystal element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent orientation defects or faults in functions of the device constitution due to difference in the surface levels of a substrate and to obtain high-quality image display characteristics with uniform orientation of a liquid crystal by forming a flattening layer which contains a specified acryl polymer component having a repeating unit on a color filter. SOLUTION: At least color filters 5a to 5c and a flattening layer 7 on the color filters 5a to 5c are formed between one substrate and a transparent electrode 2a, 2b, and the flattening layer 7 contains an acryl polymer component having the repeating unit expressed by formula. In the formula, R is H or CH3 . Since a resin compsn. containing the acryl polymer component having the repeating unit expressed by the formula is used for flattening treatment of the substrates 1a, 1b having the structure above described, difference in the surface levels due to recesses between pixels and difference in the film thickness of the color filters 5a, 5c are largely corrected. Therefore, even when transparent electrodes 2a, 2b and orientation controlling films 3a, 3b are formed on the pixels, the substrate surface can be maintained almost flat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color display liquid crystal element used for a terminal display of a computer, a television receiver, and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As one of the conventional liquid crystal devices, there is a liquid crystal display device of a type that controls transmitted light in combination with a polarizing element by utilizing the refractive index anisotropy of ferroelectric liquid crystal molecules. And Lagerwal
1) (JP-A-56-107216).
No. 4,367,924). This ferroelectric liquid crystal generally has a chiral smectic C phase (SmC ^* ) or H phase (SmH ^* ) in a specific temperature range.
^* ), Takes either the first optically stable state or the second optically stable state in response to the electric field applied in this state, and maintains that state when no electric field is applied In other words, it has bistability and quick response to a change in electric field, and is expected to be widely used as a high-speed and storage-type display element.

[0003]

In order for this ferroelectric liquid crystal element to exhibit predetermined driving characteristics, the ferroelectric liquid crystal disposed between a pair of parallel substrates needs to be driven irrespective of the state of application of an electric field. It is necessary to be in a molecular arrangement state in which conversion between the above two stable states occurs effectively. For example, for a ferroelectric liquid crystal having a chiral smectic phase, a region (monodomain) is formed in which the liquid crystal molecular layer of the chiral smectic phase is perpendicular to the substrate surface, and thus the liquid crystal molecular axis is arranged almost parallel to the substrate surface. Need to be However, in the past, in the ferroelectric liquid crystal element, since the alignment state of the liquid crystal having such a mono-domain structure was not always formed satisfactorily, sufficient characteristics were not obtained.

FIG. 4 is a sectional view of a conventional ferroelectric liquid crystal device. In the figure, reference numerals 1a and 1b denote substrates, on each of which stripe-shaped transparent electrodes 2a and 2b forming a matrix electrode structure are provided. Orientation control films 3a and 3b are provided on the transparent electrodes 2a and 2b, respectively, and the ferroelectric liquid crystal 4 is sandwiched between them.

[0005] Color filters 5a to 5c are generally made of red (R), green (G), and blue (B) dyes or a layer containing the same. Since the color filter is formed in a separate process for each color,
It is difficult to form a completely uniform film thickness from the viewpoint of film thickness control, and the film thickness setting itself may be different for each color. Further, a depression is formed in the pixel gap portion of the color filter, and as a result, a step of about 1000 ° to 1 μm is formed.

Therefore, for example, the color filters 5a to 5a
Even if a planarization layer 7 made of an organic resin is provided on c,
The effect of the step is not eliminated, and an alignment defect is generated at the ferroelectric liquid crystal 4 whose orientation is controlled by utilizing the temperature drop process.

FIG. 5 is a sketch when the ferroelectric liquid crystal device is observed with a crossed Nicol polarizing microscope. In the drawing, a white line 51 corresponds to a line of a spacer (not shown) used for the liquid crystal device. 52 and 53 are observed corresponding to the steps on the substrate 1a in FIG. Many edge lines 55 appearing in the polarizing microscope represent alignment defects of the ferroelectric liquid crystal.

[0008] As described above, when a step exceeding 500 ° particularly on the surface in contact with the ferroelectric liquid crystal is present on the substrate, an alignment defect is generated from the step, and the monodomain formation of the ferroelectric liquid crystal is inhibited.

Such a step on the substrate causes an alignment defect and a functional defect in a device configuration not only in a ferroelectric liquid crystal but also in a liquid crystal element using another liquid crystal. Therefore, an object of the present invention is to provide a liquid crystal element having high quality image display characteristics by preventing the occurrence of alignment defects due to steps of a substrate and the occurrence of malfunction of a device configuration, and obtaining uniform liquid crystal alignment. In particular, an object of the present invention is to obtain a good liquid crystal alignment in a ferroelectric liquid crystal element which is greatly affected by a step of a substrate.

[0010]

The present invention relates to a liquid crystal device comprising a pair of substrates each having a transparent electrode and a liquid crystal interposed between the pair of substrates, wherein at least a color filter is provided between one of the substrates and the transparent electrode. A liquid crystal device having a flattening layer laminated on a color filter, wherein the flattening layer is made of a resin composition containing an acrylic polymer component having at least a repeating unit represented by the following general formula (1). It is.

[0011]

Embedded image

The liquid crystal device of the present invention is suitably applied particularly to a liquid crystal device using a ferroelectric liquid crystal. Hereinafter, the present invention will be described by taking a ferroelectric liquid crystal element as an example.

The present inventor pays particular attention to the initial orientation during the temperature drop process in which the ferroelectric liquid crystal transitions from the isotropic phase (high temperature state) to the liquid crystal phase (low temperature state), and focuses on the bistability of the ferroelectric liquid crystal. The liquid crystal element of the present invention has been achieved as a structure that can achieve both the operating characteristics of the element based on the liquid crystal layer and the monodomain property of the liquid crystal layer. Is achieved.

In the present invention, the initial alignment during the temperature lowering process is improved by greatly reducing the film thickness difference and the step between pixels on the color filter so as not to cause a sudden change in the liquid crystal layer thickness. And is characterized in that a monodomain having no alignment defect is formed.

[0015]

FIG. 1 is a sectional view of a ferroelectric liquid crystal device according to an embodiment of the present invention. In the figure, reference numerals 1a and 1b denote substrates using a transparent plate such as a glass plate or a plastic plate, between which a ferroelectric liquid crystal 4 is sandwiched.
Transparent electrodes 2a and 2b having a stripe pattern forming a matrix electrode structure are provided on each of the substrates 1a and 1b, and alignment control films 3a and 3b are formed on the transparent electrodes 2a and 2b. 5a-5c are R (red), G
(Green) and B (blue) color filters, which are formed by setting the coloring material concentration in advance so as to obtain desired spectral characteristics.

On the other hand, if necessary, a light-shielding layer 6 is formed in a recess between the color filters or in a region including a pixel gap between the color filters, and a flattening layer 7 made of a specific polymer composition is further formed thereon. Are formed.

In the substrate having the above-described structure, the flattening process is performed by using the specific polymer composition, so that the difference in film thickness between the color filters 5a to 5c and the step due to the depression between pixels are largely corrected. Therefore, the transparent electrode 2
Even if a, 2b and the orientation control films 3a, 3b are sequentially formed, the substrate surface can be kept substantially flat.

In the present invention, the level difference remaining on the surface of the flattening layer 7 can be made 1000 ° or less, but is preferably 5 ° or less.
Desirably, it is not more than 00 °. This step is 1000Å
In particular, when a step difference of 1200 ° or more is generated, the above-described edge-shaped alignment defect shown in FIG. 5 is generated.

Color filter 5a used in the present invention
5c is not particularly limited as long as it has characteristics that can withstand the process conditions at the time of forming the liquid crystal element and has desired durability. As an example, a color filter formed by forming a colored resin film in a pattern by a photolithography process using a colored resin obtained by dispersing a coloring material in a polyamino resin having a photosensitive group in a molecule is exemplified. The polyamino resin (hereinafter referred to as a photosensitive polyamino resin) is an aromatic polyamide resin or a polyimide resin having a photosensitive group in its molecule, particularly, in a visible light wavelength region (400 to 7).
(00 nm) and no specific light absorption characteristic (light transmittance of about 90% or more) is preferable. In this respect, an aromatic polyamide resin is particularly preferable.

The photosensitive group may be any aromatic chain having a photosensitive hydrocarbon unsaturated group as shown below.

[0021]

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And the like.

Specific examples of aromatic polyamide resins and polyimide resins having these groups in the molecule include "Lisocoat PA-1000c" (trade name, manufactured by Ube Industries, Ltd.) and "Lisocoat PI-400" (trade name). (Trade name, manufactured by Ube Industries).

In general, the photosensitive resin used in the photolithography process varies depending on its chemical structure, but few of them have excellent mechanical properties as well as durability such as heat resistance, weather resistance and solvent resistance. On the other hand, the photosensitive polyamino-based resin is a resin system having excellent durability in terms of chemical structure, and the durability of a color filter formed using the resin is also very good.

The coloring material is not particularly limited as long as it can obtain desired spectral characteristics among organic pigments, inorganic pigments, dyes and the like. In this case, each material can be used alone or as a mixture of some of them. However, when a dye is used, the performance of the color filter is governed by the durability of the dye itself.However, if the above resin system is used, it is possible to form a color filter having better performance than a normal dyed color filter. It is. Therefore, an organic pigment is most preferable as the coloring material in consideration of the color characteristics and various performances of the color filter.

The organic pigments include soluble azo, insoluble azo and condensed azo pigments, phthalocyanine pigments, indigo, anthraquinone, perylene, perinone, dioxazine, quinacridone, isoindolinone, Condensed polycyclic pigments including phthalone-based, methine / azomethine-based, and other metal complex-based pigments, or a mixture of some of these are used.

The colored resin used to form the colored resin layer may be prepared by adding the above-mentioned colored materials having desired spectral characteristics at the same film thickness of each color to the photosensitive polyamino resin solution in an amount of about 10 to 50%. After sufficiently dispersing by ultrasonic waves or three rolls or the like, preferably, the particles having a large particle size are removed with a filter of 1 μm or less to adjust.

Next, the colored resin is applied on a substrate by a coating device such as a spinner, a roll coater, or printing, and is formed into a pattern by a photolithography process. The layer thickness is usually about 0.5 to 5 μm, preferably 0.5 to 2.0 μm
m is desirable.

When it is necessary to further increase the adhesiveness between the colored resin layer and the underlying substrate, a thin layer of a silane coupling agent or the like is applied on the substrate before forming the colored resin layer, or By forming the coloring resin layer using a coloring resin to which a silane coupling agent or the like is added in a small amount in advance, the adhesion between the substrate and the coloring resin layer can be effectively increased.

As another example of the color filter used in the present invention, there is an ink jet type color filter which is a simple process, has high use efficiency of a coloring material, and can be reduced in cost.

As a specific example of the color filter using the ink jet method, a bubble jet type using an electrothermal converter or a piezo jet type using a piezoelectric element can be used as an energy generating element. In this method, a receiving layer is formed as necessary, and an acrylic resin having high hydrophilicity is used as a material.
The receiving layer is formed by applying a resin solution on a substrate by a spin coating method, a roll coating method, a printing method, and the like, and then drying the coating. If necessary, a color-mixing prevention region is formed by photo-curing, and the image is drawn by an inkjet method. Next, post-baking is performed to a film thickness of about 0.5 to 5 μm, preferably 0.5 to 2.0 μm.
A color filter of about m is formed. In addition, as the ink used for the inkjet method, an organic pigment, an inorganic pigment,
A coloring material such as a dye is used by being dissolved or dispersed in a solvent together with a resin, an additive, and the like, if necessary.

In the present invention, the flattening layer 7 is composed of a polymer composition containing at least an acrylic polymer component having a repeating unit represented by the following general formula (1). It is preferable to use a composition comprising a product and a polyfunctional epoxy compound.

[0033]

Embedded image

As the acrylic polymer component, glycidyl acrylate or glycidyl methacrylate, or both, is used as a monomer component for forming the repeating unit represented by the general formula (1). If necessary, acrylic acid and methacrylic acid are used. It may be a copolymer of an ester or an aromatic compound containing a vinyl group.

The repeating unit component represented by the above general formula (1) is a component that controls the flattening ability at the time of heat treatment and also has a protective film function on a color filter, and particularly constitutes a ferroelectric liquid crystal element. It has excellent properties.

Therefore, when the other copolymer component is included in the polymer component, it is desirable that the structure represented by the general formula (1) is contained in a molar ratio of 30% or more. Further, the molecular weight is preferably a somewhat low molecular weight in order to obtain a molten state by heat treatment and promote flattening, and more specifically, about 1,000 to 5,000 as a weight average molecular weight in terms of polystyrene by GPC.

In the present invention, the acid anhydride contained in the resin composition forming the flattening layer 7 may be an aliphatic anhydride,
Although alicyclic and aromatic acid anhydrides are mentioned, aromatic acid anhydrides are particularly preferred from the viewpoint of various properties. Specific examples include phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, benzophenonetetracarboxylic acid, and the like. The acid anhydride is used in a weight ratio of 5 to 100% based on the acrylic polymer component.

In the present invention, the polyfunctional epoxy compound contained in the resin composition for forming the flattening layer 7 is important mainly for lowering the viscosity of the polymer composition. Compounds, glycidyl ether epoxy compounds, glycidylamine epoxy compounds, fluorinated epoxy compounds, hydantoin epoxy compounds, or cycloaliphatic epoxy compounds having a cyclohexene oxide group or a tricyclodecene oxide group, and the like. Compounds, fluorinated epoxy compounds and hydantoin epoxy compounds are preferred. The polyfunctional epoxy compound is used in a weight ratio of 1 to 150% with respect to the acrylic polymer component.

In the present invention, in addition to the above components, a silane coupling agent, a titanate coupling agent, a polysiloxane or an antioxidant, an ultraviolet ray An absorbent or the like can be added in a weight ratio of 0 to 150% with respect to the acrylic polymer component.

In the present invention, when the flattening layer 7 is formed using the above resin composition, the above resin composition components are uniformly mixed in a solvent so as to have a solid concentration of about 10 to 60% by weight. Then, the solution is applied on a color filter by spin coating, roll coating, spray coating, printing, or the like, and dried at 80 ° C. for 10 minutes.
By performing a heat treatment at 180 to 230 ° C. for about 1 hour, a highly planarized and heat-cured planarized layer is formed through a heat-melting state. The thickness of the planarized layer is as follows:
Although it is set in consideration of the required degree of flattening, it is usually set in the range of about 1 to 5 μm, preferably in the range of 1 to 3 μm.

Since the flattening layer 7 used in the present invention has the structure represented by the above-mentioned general formula, its chemical structure is excellent in transparency, heat resistance and chemical resistance, and is suitable for various device forming processes. It is a material that can be used and has excellent device durability.

Further, in some cases, for the purpose of improving the display performance, a light-shielding layer 6 is formed by depositing a thin metal film having a light-shielding ability such as chromium or aluminum on each pixel or in a region including each pixel by a vapor deposition method. It is more effective to form a light-shielding resin film in which a material having a light-shielding ability, such as carbon black, a composite oxide black pigment, and metal powder, is dispersed in the resin by a coating method.

The alignment control films 3a and 3b used in the present invention
Examples of the material include resins such as polyvinyl alcohol, polyimide, polyamide imide, polyester, polycarbonate, polyvinyl acetal, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, cellulose resin, melamine resin, urea resin, and acrylic resin; Alternatively, it can be formed by selecting from a photosensitive polyimide, a photosensitive polyamide, a cyclic rubber-based photoresist, a phenol novolak-based photoresist, or an electron beam photoresist (eg, polymethyl methacrylate, epoxidized-1,4-polybutadiene). . Although the thickness of the alignment control film depends on the thickness of the liquid crystal, it is generally 10
It is set in the range of {1 μm, preferably 50-1000}.

As the liquid crystal material used in the present invention, a ferroelectric liquid crystal having bistability is preferably used. Specifically, chiral smectic C phase (SmC ^* ), H phase (SmH ^* ), I phase (SmI ^* ), J phase (SmJ ^* ),
K phase (SmK ^* ), G phase (SmG ^* ) or F phase (SmF ^* )
^* ) Liquid crystal can be used.

As for the ferroelectric liquid crystal, "Le Journal de Physique Le Terre"("LEJOUR")
NAL DE PHYSIQUE LETTERS ")
1975, 36 (L-69), "Ferroelectric Liquid Crystall"("Ferroele
tric Liquid Crystals]); "
Applied Physics, 1980, 36 (11)
No., “Submicro Second Bistable Electrooptic Switching in Liquid Crystals” (“Submicro Second Bi
stableElectrical Switch
ing in Liquid Crystal
s]); "Solid State Physics", 1981 16 (141),
These are described in "Liquid Crystal" and the like, and in the present invention, the ferroelectric liquid crystals disclosed therein can be used.

Specific examples of the ferroelectric liquid crystal include, for example, desyloxybenzylidene-p'-amino-2-methylbutylcinnamate (DOBAMBC) and hexyloxybenzylidene-p'-amino-2-chloropropylcinnamate (HOBACPC). ), 4-o- (2-methyl)-
Butylresorcylidene-4'-octylaniline (MB
RAS).

When an element is formed using these materials, the element may be designated by a block or the like in which a heater is embedded, if necessary, in order to maintain a temperature state in which the liquid crystal compound becomes a chiral smectic phase. it can.

In the liquid crystal device of the present invention, since there is no large step on the surfaces of the alignment control films 3a and 3b in contact with the liquid crystal layer, the liquid crystal phase sandwiched between the substrates is subjected to a temperature drop during transition from the isotropic phase to the liquid crystal phase. By slow cooling, a mono-domain liquid crystal having a gradually uniform liquid crystal region is formed.

For example, the above-described DOBAMBC exhibiting a ferroelectric liquid crystal phase as a liquid crystal will be described as an example.
When gradually cooled from the isotropic phase of BAMBC, the phase transitions to a smectic A phase (SmA) at about 115 ° C. At this time,
If the substrate has been subjected to an alignment treatment such as rubbing or oblique evaporation of SiO ₂ , the molecular axes of the liquid crystal molecules are parallel to the substrate,
In addition, monodomains oriented in one direction are formed. Further, as the cooling proceeds, about 9% depending on the thickness of the liquid crystal layer is obtained.
Chiral smectic C at a specific temperature between 0 and 75 ° C
Phase transition to phase (SmC ^* ). When the thickness of the liquid crystal layer is about 2 μm or less, the helix of SmC ^* is broken, and the liquid crystal exhibits bistability.

[0050]

【Example】

Example 1 As a first example of the present invention, a liquid crystal device having the cross-sectional view shown in FIG. 1 was manufactured. FIG. 2 shows a process of forming a color filter and a flattening layer according to the present embodiment.

First, on a glass substrate 1a having a black matrix of MoTa (light-shielding layer 6) formed by a usual film forming and photolithography technique, a blue colored resin material [Heliogen] capable of obtaining desired spectral characteristics.
Blue (Heliogen Blue) L7080 (trade name, manufactured by BASF, CI No. 74160)
A-1000C (trade name, manufactured by Ube Industries, polymer =
10%, solvent: N-methyl-2-pyrrolidone, pigment: polymer = 1: 2) and a photosensitive coloring resin material prepared by spinner coating to a thickness of 1.5 μm. A colored resin layer 21 was formed (a).

Next, the colored resin layer 21 was prebaked at 80 ° C. for 10 minutes, and then exposed with a high-pressure mercury lamp through a photomask 22 corresponding to the pattern shape to be formed (b).

After the completion of the exposure, as shown in FIG.
(Developer mainly containing γ-butyrolactone) for dissolving only the unexposed portions of the colored resin layer 21 having No. 3
Develop using ultrasonic waves, and use a special rinsing liquid (for example,
After treatment with a rinse liquid containing ethyl cellosolve as a main component), post-baking was performed at 200 ° C. for 30 minutes to form a blue colored resin layer having a predetermined pattern, that is, a color filter 5c (d).

Subsequently, as a second color, a green colored resin material [Lionol Green 6YK] was formed on the glass substrate on which the blue colored pattern was formed.
(Product name, manufactured by Toyo Ink Co., Ltd., CI No. 7426
5) A photosensitive colored resin prepared by dispersing 5) in PA-100C (trade name, manufactured by Ube Industries, Ltd., polymer content = 10%, solvent: N-methyl-2-pyrrolidone, pigment: polymer = 1: 2) A green color filter 5b was formed at a predetermined position on the substrate in the same manner as described above, except that the material was used.

Further, on the substrate on which the blue and green color filters are formed, as a third color, a red colored resin material [Irgazin Re
d) BPT (trade name, Ciba-Gei
gy), C.I. I. No. 71127) to PA-10
00C (trade name, manufactured by Ube Industries, polymer content = 10%,
Solvent: N-methyl-2-pyrrolidone, pigment: polymer =
1: 2 blended photosensitive photosensitive resin material prepared by
A red color filter 5a was formed in the same manner as described above except that the color pattern was used, and a colored pattern of three color stripes of R, G, and B was obtained (e).

On the color filter pattern thus obtained, as a planarizing layer 7, a copolymer containing glycidyl methacrylate as a main component and having a repeating unit represented by the following general formula, and a heat-melt-curable acrylic A resin composition (containing 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate as a polyfunctional epoxy compound and trimellitic anhydride as an acid anhydride) is applied by a spinner coating method,
After a pre-bake treatment at 0 ° C. for 10 minutes, a heat treatment was performed at 200 ° C. for 1 hour to form a highly planarized planarized layer 7 having a thickness of 2.2 μm through a heat-melting state (f). ).

[0057]

Embedded image

Next, ITO was applied to each of the color filter substrate and the substrate 1b opposed to the color filter substrate.
A film was formed to a thickness of Å by a sputtering method, and then patterned by a conventional method to obtain transparent electrodes 2a and 2b. A polyimide forming solution ("PIQ", manufactured by Hitachi Chemical Co., Ltd.) was applied as a spin control on the film as an orientation control film 3a, 3b, and heated at 200 ° C. for 1 hour to form a polyimide film having a thickness of 1000 °. Thereafter, the surface of the polyimide film was subjected to a rubbing treatment.

The color filter substrate thus formed and the opposing substrate were bonded together to form a cell, and a ferroelectric liquid crystal was injected and sealed to obtain a liquid crystal element. Observation of this liquid crystal element with a crossed Nicol polarizing microscope confirmed that no liquid crystal molecules had any alignment defects.

Embodiment 2 FIG. 3 is a sectional view of a liquid crystal device according to a second embodiment of the present invention.

First, on a glass substrate 1a having a black matrix of MoTa (light shielding layer 6) formed by ordinary film formation and photolithography technology, an acrylic receiving layer having an aqueous ink receiving ability was formed by spin coating. It was applied to a thickness of 0.0 μm. Next, at 50 ° C.
After the pre-baking for 10 minutes, deep-UV exposure (50 at λ = 254 nm) is performed on the color mixture prevention region through a photomask that forms the color mixture prevention region by photo-curing.
mJ / cm ² ). Then, after performing PEB (post exposure bake) processing on a hot plate at 120 ° C. for 90 seconds, coloring processing is performed using a dye-based R, G, B coloring ink in an ink jet printing apparatus. Was carried out to obtain an RGB three-color filter 5.

As a flattening layer 7 on the color filter pattern thus obtained, a heat-melt-curable acrylic resin similar to that of Example 1 was applied by a spinner coating method, and prebaked at 80 ° C. for 10 minutes. , And 200
By a heat treatment at 1 ° C. for 1 hour, a highly planarized layer 7 having a thickness of 2.0 μm was formed after being heated and melted.

On this, the same orientation control film as in Example 1 was formed, and the other substrate on which the transparent electrode and the orientation control film were similarly formed was bonded to form a cell, and ferroelectric liquid crystal was injected and sealed. A liquid crystal element was obtained. Observation of this liquid crystal element with a crossed Nicol polarizing microscope confirmed that no liquid crystal molecules had any alignment defects.

[0064]

As described above, in the present invention, the difference in film thickness of the color filter layer on the substrate and the step between pixels are highly planarized by the planarization layer made of a polymer component having a specific chemical structure. Therefore, a minute step on a surface in contact with the liquid crystal can be eliminated, an alignment defect of the liquid crystal can be prevented, and a liquid crystal element which can sufficiently exhibit characteristics of the liquid crystal can be provided. In particular, when applied to a ferroelectric liquid crystal element, the effect is remarkable.

Further, according to the present invention, it is possible to uniformly and stably form various constituent members formed on a flattened color filter, and to provide a liquid crystal element of stable quality by a simple method. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal element according to an embodiment of the present invention.

FIG. 2 is a partial process view of the liquid crystal element according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a liquid crystal device according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a conventional ferroelectric liquid crystal element.

FIG. 5 is a schematic explanatory view showing an alignment defect in a conventional ferroelectric liquid crystal element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1a, 1b Substrate 2a, 2b Transparent electrode 3a, 3b Alignment control film 4 Ferroelectric liquid crystal 5, 5a-5c Color filter 6 Light-shielding layer 7 Flattening layer 21 Colored resin layer 22 Photomask 23 Light-cured part

Claims (5)

[Claims] 1. A liquid crystal element comprising a pair of substrates each having a transparent electrode, wherein a liquid crystal is interposed between the pair of substrates, wherein at least a color filter is provided between one of the substrates and the transparent electrode, and a flat layer laminated on the color filter. A liquid crystal device having a functionalized layer, wherein the flattening layer comprises a resin composition containing an acrylic polymer component having at least a repeating unit represented by the following general formula (1). Embedded image 2. The liquid crystal device according to claim 1, wherein the resin composition is a heat-melt-curable type. 3. The liquid crystal device according to claim 1, wherein the resin composition comprises the acrylic polymer component, an acid anhydride, and a polyfunctional epoxy compound. 4. The liquid crystal device according to claim 1, wherein the structure represented by the general formula (1) is contained in the acrylic polymer component in a molar ratio of 30% or more. 5. The liquid crystal according to claim 1, wherein said liquid crystal is a ferroelectric liquid crystal.
5. The liquid crystal device according to any one of items 1 to 4.