JP2587627B2 - Chiral smectic liquid crystal device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a chiral smectic liquid crystal device such as a liquid crystal display device or a liquid crystal-light shutter array, and more particularly, to improving the initial alignment state of liquid crystal molecules. The present invention relates to a chiral smectic liquid crystal device having a color filter having a uniform monodomain liquid crystal phase free from alignment defects and having improved display and driving characteristics.

[Prior art] As a conventional liquid crystal element, for example, M. Shut (M.
“Applied Physics Letters” by Schadt and W. Helfrich (“Appplied
Physics Letters ", Volume 18, Issue 4 (issued February 15, 1971), pp. 127-128," Voltage Dependent Optical Activity of a Twisted Nematic Liquid Crystal ( “Volt
age Dependent Optical Activity of a Twisted Nemati
c Liquid Crystal "), which use a twisted nematic liquid crystal. This TN liquid crystal is used in a time-division driving method using a matrix electrode structure with a high pixel density. Since there is a problem that a talk occurs, the number of pixels is limited.

Further, a display element of a type in which a switching element formed by a thin film transistor is connected to each pixel and switching is performed for each pixel is known, but a process of forming a thin film transistor on a substrate is extremely complicated, and a large-area display element is required. There are problems that are difficult to create.

To solve these problems, Clark (Cl
ark) et al. in U.S. Pat. No. 4,367,924 propose a ferroelectric liquid crystal device.

FIG. 2 schematically illustrates an example of a cell for explaining the operation of the ferroelectric liquid crystal. 21a and 21b are In ₂ O ₃ , SnO
₂ or a substrate (glass plate) covered with a transparent electrode made of a thin film such as ITO (Indium Tin Oxide), in which a plurality of liquid crystal molecular layers 22 are oriented so as to be perpendicular to the glass surface.
^* Phase or SmH ^* phase liquid crystal is enclosed. A bold line 23 represents a liquid crystal molecule.
_{Has a} dipole moment ( _P⊥ ) 24 in the direction perpendicular to the molecule. When a voltage equal to or higher than a certain threshold is applied between the electrodes on the substrates 21a and 21b, the helical structure of the liquid phase molecules 23 is released, and the dipole moment ( _P⊥ ) 24 is directed to the direction of the electric field. The orientation direction can be changed. The liquid crystal molecules 23 have a slender shape and exhibit refractive index anisotropy in the major axis direction and the minor axis direction. Therefore, for example, the polarizer can be placed above and below the glass surface in a crossed Nicols positional relationship. For example, it is easily understood that a liquid crystal optical modulation element whose optical characteristics change depending on the voltage application polarity is obtained.

The thickness of the liquid crystal cell preferably used in the ferroelectric liquid crystal device of the present invention can be made sufficiently thin (for example, 10 μm or less). As shown in FIG. 3, as the liquid crystal phase becomes thinner, the helical structure of the liquid crystal molecules is unwound and becomes non-helical even when no electric field is applied.
The dipole moment Pa or Pb takes either the upward (34a) or downward (34b) state. When an electric field Ea or Eb having a different polarity or more than a certain threshold is applied to such a cell as shown in FIG. 3, the dipole moment becomes
The direction is changed to upward 34a or downward 34b in accordance with the electric field vector of Ea or Eb, and accordingly, the liquid crystal molecules are aligned in one of the first stable state 33a and the second stable state 33b.

As described above, there are two advantages of using such a ferroelectric liquid crystal as the optical modulation element. The first is that the response speed is extremely fast, and the second is that the orientation of the liquid crystal molecules has bistability. The second point will be further described with reference to FIG. 3, for example, when an electric field Ea is applied, the liquid crystal molecules are oriented to a first stable state 33a. This state is stable even when the electric field is cut off. When an electric field Eb in the opposite direction is applied, the liquid crystal molecules align in the second stable state 33b and change the direction of the molecules, but remain in this state even after the electric field is cut off. As long as the applied electric field Ea does not exceed a certain threshold value, each of the alignment states is also maintained. In order to effectively realize such a high response speed and bistability, it is preferable that the cell be as thin as possible.

In order for the ferroelectric liquid crystal element to exhibit a predetermined driving characteristic, the ferroelectric liquid crystal disposed between the pair of parallel substrates needs to be switched between the above two stable states irrespective of the applied state of the electric field. It is necessary to be in a molecular arrangement in which the conversion takes place 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 conventional ferroelectric liquid crystal devices, since the alignment state of the liquid crystal having such a monodomain structure is not always formed satisfactorily, sufficient characteristics cannot be obtained.

FIG. 4 is a sectional view of a conventional ferroelectric liquid crystal device.
FIG. 5 is a schematic explanatory view showing a state of an alignment defect which has appeared in a conventional ferroelectric liquid crystal element.

That is, the conventional ferroelectric liquid crystal element 40 shown in FIG.
Has a pair of parallel substrates 41 and 42, and the substrates 41 and 42 are provided with striped transparent electrodes 43 and 44 forming a matrix electrode structure, respectively.

Generally, a color filter is composed of red (R), green (G), and blue (B) dyes or a layer containing the dyes. A step A of about 1 μm is formed. As a result, when the alignment is controlled by using the temperature decreasing process, the above-described step A causes an alignment defect in the ferroelectric liquid crystal 47 at the step A. Also, this step A
On the substrates 41 and 42 on which the alignment control films 45 and 46 respectively exist.
Is provided, a step C formed in accordance with the step A also occurs in the alignment control film with almost the thickness of the pixel, and an alignment defect occurs in the ferroelectric liquid crystal 47 in the same manner as described above.

FIG. 5 is a sketch when the above ferroelectric liquid crystal element 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 element, and a line 52. And 53 are observed on the substrate 41 of FIG. The portion 54 in the figure is a ferroelectric liquid crystal sandwiched between the counter electrodes. A large number of edge lines 55 appearing in the polarizing microscope represent alignment defects of the ferroelectric liquid crystal.

If there is a certain level difference on the surface in contact with the ferroelectric liquid crystal, an alignment defect is generated from the level difference, and the monodomain formation of the ferroelectric liquid crystal is hindered.

[Problems to be Solved by the Invention] When the color filter is provided inside the ferroelectric liquid crystal element, the present inventors consider that the step on the substrate, that is, the pixel interval is not larger than the film thickness of the color filter. It has been clarified by an experiment that a step (concave groove) generated when the ratio exceeds 5 times that of the above causes a serious alignment defect in the ferroelectric liquid crystal.

In addition, in such a step, even if a protection / flattening layer is formed on the color filter, the recess between pixels cannot be completely covered, and the flattening effect is significantly reduced.
This causes an alignment defect in the ferroelectric liquid crystal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a chiral smectic liquid crystal device capable of preventing the occurrence of the above-described alignment defect and sufficiently exhibiting the high-speed response and the memory effect characteristics inherent to a ferroelectric liquid crystal device. .

[Means for Solving the Problems] The present inventors have paid attention to the initial orientation in 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). The present invention has found a chiral smectic liquid crystal device having a structure capable of achieving both the operating characteristics of the device based on the bistability of the dielectric liquid crystal and the monodomain property of the liquid crystal layer.

The liquid crystal element of the present invention is based on such knowledge. More specifically, there is no step (concave groove) that induces alignment defects on the surface in contact with the liquid crystal layer, that is, the film thickness of the liquid crystal layer is sharp. It is characterized in that the initial orientation during the temperature lowering process is kept in a good state by preventing any significant change from occurring, and a monodomain having no alignment defect is formed.

That is, the present invention provides a pair of substrates provided with a transparent electrode, a chiral smectic liquid crystal disposed between the pair of substrates, and at least one of the substrates, so as to form a plurality of pixels spaced apart from each other. In a chiral smectic liquid crystal device having a plurality of color filters disposed separately, the plurality of color filters are set to have substantially the same film pressure d, and when an interval between adjacent color filters is 1, 0 <l / d ≦ 5 and 0.5μm ≦ d ≦ 3.0μ
m is a chiral smectic liquid crystal element characterized by having a relationship of m.

 Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a substrate structure of a ferroelectric liquid crystal device as a chiral smectic liquid crystal device according to the present invention. In FIG. 1, a ferroelectric liquid crystal element 1 includes substrates 2 and 3 using a transparent plate such as a glass plate or a plastic plate.
, And a ferroelectric liquid crystal 4 is interposed therebetween.
On each of the substrates 2 and 3, there are disposed transparent electrodes 5 and 6 in the form of stripes forming a matrix electrode structure. On the transparent electrodes, alignment control films 7 and 8 are formed. Each of the R (red), G (green), and B (blue) color filters is formed by setting a coloring material concentration in advance so as to have desired spectral characteristics with the same film thickness.
On the other hand, in order to further planarize, if necessary, a light-shielding layer 10 is formed in a recess between the color filters, and a protective film or a planarizing film 9 is further formed thereon.

In the substrate having the above configuration, the film thickness of each color of the color filter is set to be substantially the same, and the interval between pixels is suppressed to 5 times or more of the film thickness. Steps have been corrected.

Further, a liquid crystal element using a color filter layer in which each pixel interval is set in a range exceeding 5 times the film thickness is the same as that of the above-described fifth embodiment.
As a result, an alignment defect of the edge line shown in FIG.

As a color filter suitable for the present invention, any method may be used as long as the film thickness of each pixel can be set to be substantially the same, but a fine pattern can be formed by a particularly simple manufacturing process, The following method, which is a color filter having excellent properties such as heat resistance, light resistance, and solvent resistance, is preferred.

That is, the optimal color filter for the present invention is formed by repeating the photolithography process of a colored resin obtained by dispersing a colored material in an aromatic polyamide resin or a polyimide resin having a photosensitive group in a molecule. It is.

More specifically, as an aromatic polyamide resin or polyimide resin having a photosensitive group in a molecule that forms a colored resin layer having a color filter, a cured film obtained at 200 ° C. or lower, for example, 150 ° C. × A cured film can be formed with about 30 heat, especially in the visible light wavelength range (400-700nm)
And those having no specific light absorption characteristics (light transmittance of about 90% or more) are preferable. In this respect, an aromatic polyamide resin is particularly preferable.

The photosensitive group in the present invention may be any aromatic chain having a photosensitive hydrocarbon unsaturated group as shown below, for example: (1) benzoic esters (Wherein R ₁ is CHX = CY-COO-Z-, X is -H or -C ₆ H ₅ ,
Y is -H or -CH _3, Z is - or an ethyl group or a glycidyl group) (2) Benzyl acrylate (Wherein, Y represents —H or CH ₃ ) (3) Diphenyl ethers (Wherein R ₂ is _{CHX = CY-CONH-, CH 2} = CY-COO- (CH 2) 2
Containing one or more —OCO— or CH ₂ CYCY—COO—CH ₂ —,
X and Y represent the same groups as above.) (4) Chalcone and other compound chains (Wherein R ₃ represents H-, an alkyl group or an alkoxy group) And the like.

Specific examples of aromatic polyamide resins and polyimide resins having these groups in the molecule include “Lisocoat PA”.
−1000 ”(trade name, manufactured by Ube Industries, Ltd.),“ Lisocoat P
I-400 "(trade name, manufactured by Ube Industries, Ltd.) and the like.

In general, the photosensitive resin used in the photolithography process varies depending on its chemical structure, but few of them have excellent durability such as heat resistance, light resistance and solvent resistance as well as mechanical properties. On the other hand, the photosensitive polyamide-based resin of the present invention is a resin system having excellent durability in terms of chemical structure, and the durability of a color filter formed using these resins is also very good. Becomes In particular, it exhibits excellent heat resistance when sputter-forming a transparent dielectric film on a color filter, which can be a problem as a color filter for ferroelectric liquid crystal elements, and excellent performance when the color filter is damaged by inner spacers when assembling the liquid crystal element. Is what you do.

The coloring material forming the colored resin layer of the color filter in the present invention 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 using a dye,
Although the performance of the color filter is governed by the durability of the dye itself, the use of the above-mentioned resin system enables the formation of a filter having better performance than a normal dye color filter. Therefore, an organic pigment is most preferable as the coloring material in consideration of the color characteristics and various performances of the color filter.

Organic pigments include azo pigments such as soluble azo, insoluble azo and condensed azo pigments, phthalocyanine pigments, and indigo, anthraquinone, perylene, dioxazine, quinacridone, isoindolinone, and phthalone. Methine-azomethine-based, condensed polycyclic pigments including other metal complex-based pigments, or a mixture of some of these.

In the present invention, the colored resin used to form the colored resin layer is such that the photosensitive polyamide-based resin solution is prepared by adding the colored materials having the desired spectral characteristics at the same film thickness of each color to about 10 to 70% by weight, respectively. , And dispersed sufficiently by ultrasonic waves or a three-roll, ball mill, sand mill, or the like, and preferably prepared by removing a substance having a large particle size using a filter of 1 μm or less.

The colored resin layer of the color filter according to the present invention is formed by applying the colored resin on a substrate by using a coating device such as a spinner or a roll coater, and forming a pattern by a photolithography process. Normally, the same film thickness of each color, 0.5 to 3.0
About μm, preferably about 0.5 to 1.5 μm is desirable.

If it is necessary to further increase the adhesiveness between the colored resin layer and the underlying substrate, a colored resin pattern may be formed on the substrate in advance with a thin coating with a silane coupling agent or the like, or the colored resin pattern may be formed in advance. It is more effective to form a color filter by using a mixture of a small amount of a silane coupling agent and the like.

The colored resin layer of the color filter according to the invention is composed of a good material having sufficient durability per se, but in particular, from more various environmental conditions, to protect the colored resin layer, or In order to flatten the surface of the color filter, an organic resin such as polyamide, polyimide, polyurethane, polycarbonate, silicon or the like, Si ₃ N ₄ , SiO ₂ , SiO, Al ₂ O ₃ , Ta ₂ O An inorganic film such as ₃ can be provided as a protective film or a flattening film by a spin coating or roll coating application method or a vapor deposition method.

In this case, since the surface of the color filter has a shape with less steps, it is more suitable for eliminating the alignment defect of the ferroelectric liquid crystal element aimed at by the present invention.

Further, since the thickness of the protective film 9 can determine the thickness of the ferroelectric liquid crystal 4, it varies depending on the type of the liquid crystal material, the required response speed, and the like.
It is set in the range of μm to 20 μm, preferably 0.5 μm to 10 μm.

In some cases, to improve display characteristics,
In order to further reduce the gap between pixels, the light-shielding layer is formed by depositing a thin metal film having a light-shielding ability, such as chrome or aluminum, in accordance with each pixel by vapor deposition, or in a photosensitive polyamide or polyimide resin. A light-shielding resin layer in which a material having a light-shielding ability such as black, a composite oxide black pigment, or a metal powder is dispersed can be formed by a coating method.

Examples of the material of the alignment control film used in the present invention include, for example, polyvinyl alcohol, polyimide, polyamide imide, polyester, polycarbonate, pyrivinyl acetal, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, cellulose resin, melamine resin, and urea. Resins such as resin and acrylic resin, or photosensitive polyimide, photosensitive polyamide, cyclic rubber photoresist, phenol novolak photoresist or electron beam photoresist (polymethyl methacrylate, epoxidized-1,4-polybutadiene, etc.) It can be formed by selecting from. Although it depends on the thickness of the ferroelectric liquid crystal, the orientation control film 7 is generally set in the range of 10 to 1 μm, preferably in the range of 100 to 3000.

Particularly suitable as the liquid crystal material used in the present invention is a liquid crystal having bistability and having ferroelectricity. Specifically, chiral smectic C phase (SmC ^* ), H phase (SmH ^* ), I phase (SmI ^* ), J phase (SmJ ^* ), K
A liquid crystal of a phase (SmK ^* ), a G phase (SmG ^* ), or an F phase (SmF ^* ) can be used.

About this ferroelectric liquid crystal,
De Physique Le Terreux "(" LEJOURNAL DE PHYSIQU
E LETTRES ") 1975, 36 (L-69)," Ferroelectric Liquid Crystals "(" Ferroelectri
c Laquid Crystals ”);“ Applied Physics Letters ”1980,
No. 36 (11), “Submicro Second Bistable Electrooptic Switching in Liquid Crystals” (“Submicro Second Bistable Ele
ctorrptic Switching in Liquad Crystals ”);“ Solid State Physics ”, 1981 16 (141),“ Liquid Crystals ”and the like. In the present invention, the ferroelectric liquid crystals disclosed therein can be used. .

Specific examples of the ferroelectric liquid crystal include, for example, disiloxybedylidene-p'-amino-2-methylbutylcinnamate (DOBAMBC) and hexyloxybenzylidene-p'-
Amino-2-chloropropylcinnamate (HOBACP
C), 4-o- (2-methyl) -butylresosilidene-
4'-octylaniline (MBRAS).

When an element is formed using these materials, the element must be supported by a block or the like in which a heater is obtained, if necessary, in order to maintain a temperature state in which the liquid crystal compound becomes a chiral smectic phase. Can be.

[Operation] In the chiral smectic liquid crystal element of the present invention, the color filters of each pixel are formed to have substantially the same thickness, the thickness of the color filter of each pixel is d (μm), and the distance between adjacent pixels is l. (Μm), the relationship of 0 <l / d ≦ 5 and 0.5 μm ≦ d ≦ 3.0 μm is satisfied, so that the flatness of the substrate is improved and there is no step which causes alignment defects on the surface in contact with the liquid crystal phase. The liquid crystal phase sandwiched between the substrates having good flatness is gradually cooled in the temperature decreasing process in which the liquid crystal phase shifts to the liquid crystal phase due to the isotropic phase, thereby gradually expanding the liquid crystal phase region to form a uniform monodomain liquid crystal phase. Become like

For example, the above-mentioned DOBA showing a ferroelectric liquid crystal phase as a liquid crystal
To explain by taking MBC as an example, when gradually cooling with the isotropic phase of DOBAMBC, the smectic A phase (SmA
Phase). At this time, rubbing or
When an alignment process such as SiO ₂ oblique deposition is performed, monodomains in which the molecular axes of the liquid crystal molecules are parallel to the substrate and oriented in one direction are formed. Further, as the cooling is further advanced, a phase transition to a chiral smectic liquid crystal C phase (SmC ^* phase) occurs at a specific temperature of about 90 to 75 ° C. depending on the thickness of the liquid crystal element. When the thickness of the liquid crystal phase is about 2 μm or less, the helix of the SmC ^* phase is broken, and the liquid crystal exhibits bistability.

[Example] Hereinafter, the present invention will be described more specifically with reference to examples.

Example 1 FIGS. 6 (a) to 6 (f) are process diagrams showing a process of forming R, G, and B color pixels.

First, a blue colored resin material [Heliog Blue (Heliog Blue) capable of obtaining desired spectral characteristics is provided on a glass substrate 61.
en Blue) PA of L7080 (product name, BASF company nature, CI No. 74160)
−1000C (brand name, manufactured by Ube Industries, polymer content = 10%,
Solvent: N-methyl-2-pyrrolidone) and dispersed (pigment: polymer = 1: 2 blended) to produce a photosensitive colored resin material] was applied to a film thickness of d μm by a spinner coating method.
(See FIG. 6 (a).) Next, after pre-baking the colored resin layer 62 at 70 ° C. for 30 minutes, it is exposed with a high-pressure mercury lamp through a photomask 63 corresponding to the pattern shape to be formed. did. (See FIG. 6 (b).) After the exposure, as shown in FIG. 6 (c), the photocured portion 62a
Is developed using ultrasonic waves with a dedicated developer (a developer mainly containing N-methyl-2-pyrrolidone) that dissolves only the unexposed portions of the colored resin layer 62 having Rinse solution mainly composed of isopropyl alcohol)
And then post-baked at 200 ° C. for 30 minutes to obtain a blue patterned colored resin layer having a patterned shape.
Formed 64. (Refer to FIG. 6 (d).) Subsequently, a green colored resin material [Lionol Green 6YK (trade name, manufactured by Toyo Ink Co., Ltd., C .
I.No.74265) was dispersed (pigment: polymer = 1: 2) in PA-1000C (trade name, manufactured by Ube Industries, Ltd., polymer content = 10%, solvent: N-methyl-2-pyrrolidone). Photosensitive colored resin material], and a green pattern colored resin layer 65 is formed at a predetermined position on the substrate in the same manner as described above, with the pixel spacing from the blue colored pattern being the actually measured value 1 (μm). did.

Further, on the substrate on which the blue and green patterns are formed in this manner, as a third color, a red colored resin material [Irgazin Red BPT (trade name, manufactured by Ciba-Geigy), CINo. .71127) to PA−
1000C (trade name, manufactured by Ube Industries, Ltd., polymer content = 10%, solvent: N-methyl-2-pyrrolidone) dispersed (pigment: polymer = 1: 2) prepared and used as a photosensitive colored resin material] , The pixel spacing between the blue and green colored patterns
(Μm), a red patterned colored resin layer 66 is formed at a predetermined position on the substrate in the same manner as above, and R (red), G
(Green) and B (blue) colored patterns of three color stripes were obtained. (Refer to FIG. 6 (e).) Next, a black colored resin material [carbon black (CI No. 77266) is PA-1000C (polymer content = 10) as a light shielding layer on a glass substrate on which a three-color coloring pattern is formed. %) (Light-sensitive colored resin material prepared by dispersing (pigment: polymer = 1: 4)) and the light-shielding layer of the light-shielding pattern in the same manner as described above so as to match the distance between the pixels. 67 formed.

On the color filter pattern obtained in this manner, a transparent resin material [PA-1000C (trade name, manufactured by Ube Industries, Ltd., polymer component = 10%, solvent: N-methyl-2-pyrrolidone)] with a thickness of about 0.5 μm by a spinner coating method. (Refer to FIG. 6 (f).) Next, as shown in FIG. 1, ITO was formed to a thickness of 500 ° by a sputtering method to form a transparent electrode 5. A polyimide forming solution (Hitachi Kasei Kogyo “PIQ”) is applied thereon as an orientation control film 7 by a spinner rotating at 3000 rpm,
Heating was performed at 0 ° C. for 30 minutes to form a polyimide film of 2000 °. Thereafter, the surface of the polyimide film was subjected to a rubbing treatment.

The color filter substrate thus formed and the opposing substrate 3 are attached to form a cell, and a ferroelectric liquid crystal “CS-1014” (trade name) manufactured by Chisso Corporation is injected. An element was obtained. This liquid crystal element was observed with a crossed Nicol polarizing microscope, and the degree of alignment defect of liquid crystal molecules inside was evaluated.

In the above method, the color filter thickness d (μm)
Table 1 shows the results of evaluation of alignment defects by changing the distance l (μm) between pixels of the color filter and the color filters.

[Effects of the Invention] As described above, according to the present invention, by setting the pixel interval of the color filter on the substrate to 5 times or less of the film thickness, alignment defects caused by a step between pixels can be significantly reduced. Became possible.

In addition, by providing a light-shielding layer and a protective / planarizing layer on the color filter as needed, it is possible to sufficiently reduce a step generated between each pixel of the color filter, thereby preventing the occurrence of alignment defects. Accordingly, it is possible to provide a chiral smectic liquid crystal element capable of sufficiently exhibiting the characteristics of the ferroelectric liquid crystal.

Furthermore, according to the present invention, excellent mechanical strength, and,
A color filter part having a fine pattern with excellent properties such as heat resistance, light resistance, and solvent resistance can be manufactured by a simple manufacturing process, and a color chiral smectic liquid crystal element with excellent performance can be easily manufactured. Can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a basic structure of a ferroelectric liquid crystal device according to the present invention, FIGS. 2 and 3 are perspective views schematically showing a ferroelectric liquid crystal used in the present invention, and FIG. FIG. 5 is a cross-sectional view of a conventional ferroelectric liquid crystal element, FIG. 5 is a schematic explanatory view showing a state of an alignment defect appearing in the conventional ferroelectric liquid crystal element, and FIGS. FIG. 3 is a process diagram showing a process of forming a color pixel. 1,40 ... ferroelectric liquid crystal element 2,3,41,42,61 ... substrate 4,47 ... ferroelectric liquid crystal 5,6,43,44 ... transparent electrode 7,8,45,46 ... … Orientation control film 9,48,68… Protective film (planarization film) 10,67… Light-shielding layer 62 …… Colored resin layer 62a …… Photo-cured portion 63 …… Photomask 64,65,66 …… Pattern Colored resin layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Tatsuo Murata, Inventor 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Nobuyuki Sekimura 3-30-2, Shimomaruko, Ota-ku, Tokyo Canon Inside the corporation

Claims (3)

(57) [Claims] 1. A pair of substrates provided with a transparent electrode, a chiral smectic liquid crystal disposed between the pair of substrates, and at least one of the substrates are spaced apart from each other so as to form a plurality of pixels spaced apart from each other. In a chiral smectic liquid crystal device having a plurality of color filters provided, the plurality of color filters are set to have substantially the same film thickness d, and when an interval between adjacent color filters is 1, 0 <l / d ≦ 5. And 0.5 μm ≦ d ≦ 3.0 μm. A chiral smectic liquid crystal device. 2. The color filter according to claim 1, wherein the color filter is a color filter in which a coloring material is dispersed and contained in an aromatic polyamide resin or an aromatic polyimide resin having a photosensitive group bonded in a molecule. Chiral smectic liquid crystal element. 3. The color filter according to claim 1, wherein the color filter is a color filter that is disposed between a transparent electrode and a substrate, and a protective film is disposed between the color filter and the transparent electrode. Chiral smectic liquid crystal element.