JPH05100112A - Color filter substrate and liquid crystal element - Google Patents

Abstract

PURPOSE:To provide the color filter substrate which is free from a difference in the film thickness of color filter layers and the liquid crystal element which prevents the generation of orientation detects. CONSTITUTION:This color filter substrate is constituted by having the color filters which consist of colored resins formed by dispersing coloring materials into a low-temp. curing type polyimide resins having photosensitive groups within the molecules and have nearly the same film thickness on a substrate 2 and successively laminating a protective layer 9 and transparent electrode 5 of a pattern shape on the color filters. This liquid crystal element is constituted by using this substrate. Light shielding layers 10 are provided at nearly the same thickness as the thickness of respective picture elements in the recesses between the picture elements of the color filters.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a liquid crystal display device and a liquid crystal display.
Regarding a color filter substrate and a liquid crystal element used for an optical shutter array and the like, more specifically, by improving the initial alignment state of liquid crystal molecules, a uniform monodomain liquid crystal phase without alignment defects was obtained, and display and driving characteristics were improved. The present invention relates to a color filter substrate having a color filter and a liquid crystal element.

[0002]

2. Description of the Related Art As a conventional liquid crystal element, for example,
"Applied Physics" by M. Schadt and W. Helfrich
s Letters ") Volume 18, Issue 4 (Published February 15, 1971), pages 127-128," Voltage Dependant Optical Activity of a Twisted Nematic Liquid Crystal ". "Voltage Dependent O
optical Activity of a Twis
ted Nematic Liquid Crystal
l ") shown in twisted nematic (twis)
A liquid crystal using a ted nematic liquid crystal is known. This TN liquid crystal has a problem that crosstalk occurs during time-divisional driving using a matrix electrode structure having a high pixel density, and thus the number of pixels is limited.

Further, a display element of a type in which a switching element made of a thin film transistor is connected to each pixel and each pixel is switched is known, but the step of forming the thin film transistor on the substrate is extremely complicated and a large area is required. There is a problem that it is difficult to make a display element.

As a solution to these problems, Clark et al., US Pat. No. 4,367,
A ferroelectric liquid crystal device is proposed in the specification of No. 924.

FIG. 2 illustrates the operation of the ferroelectric liquid crystal.
It is a schematic drawing of an example of a cell. 21a and 21b
Is In ₂ O ₃ , SnO ₂ or ITO (Indium T
inOxide) is a substrate (glass plate) covered with a transparent electrode composed of a thin film, and liquid crystal of SmC ^* phase or SmH ^* phase in which a plurality of liquid crystal molecular layers 22 are aligned perpendicular to the glass surface It is enclosed. A thick line 23 represents a liquid crystal molecule, and this liquid crystal molecule 23
Is the dipole moment (P
⊥) 24. When a voltage above a certain threshold is applied between the electrodes on the substrates 21a and 21b, the helical structure of the liquid crystal molecules 23 is unraveled, and all the dipole moments (P⊥) 24 are oriented in the electric field direction. Can be changed. The liquid crystal molecule 23 has an elongated shape and exhibits refractive index anisotropy in its major axis direction and its minor axis direction,
Therefore, for example, it is easily understood that a liquid crystal optical modulation element whose optical characteristics change depending on the polarity of voltage application can be obtained by disposing polarizers arranged in a crossed Nicol positional relationship above and below a glass surface.

Among the liquid crystal elements of the present invention, the liquid crystal cell preferably used in the ferroelectric liquid crystal element 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 unwinds and becomes a non-helical structure as shown in FIG. 3, and the dipole moment Pa or Pb of the liquid crystal molecule is directed upward (34a). Alternatively, the state is either downward (34b). When an electric field Ea or Eb having a polarity different from a certain threshold value is applied to such a cell as shown in FIG. 3, the dipole moment is directed upward 34a or downward 34b corresponding to the electric field vector of the electric field Ea or Eb.
The liquid crystal molecules are aligned in either the first stable state 33a or the second stable state 33b accordingly.

As described above, there are two advantages of using such a ferroelectric liquid crystal as an optical modulator. The first is that the response speed is extremely fast, and the second is that the alignment of the liquid crystal molecules has bistability. To further explain the second point, for example, with reference to FIG. 3, when the electric field Ea is applied, the liquid crystal molecules are aligned in the first stable state 33a, but this state is stable even when the electric field is cut off. When a reverse electric field Eb is applied, the liquid crystal molecules are in the second stable state 3
3b is oriented to change the direction of the molecule, but it remains in this state even when the electric field is cut off. Further, as long as the applied electric field Ea does not exceed a certain threshold value, the respective alignment states are still maintained. In order to effectively realize such a high response speed and bistability, it is preferable that the cell is as thin as possible.

In order for this ferroelectric liquid crystal element to exhibit a predetermined driving characteristic, the ferroelectric liquid crystal disposed between the pair of parallel substrates has the above two stable states regardless of the electric field application state. It is necessary that the molecular arrangement is such that the conversion between the two occurs effectively. For example, for a ferroelectric liquid crystal having a chiral smectic phase, the liquid crystal molecular layer of the chiral smectic phase is perpendicular to the substrate surface,
Therefore, it is necessary to form a region (monodomain) in which the liquid crystal molecular axes are arranged substantially parallel to the substrate surface. However, in the conventional ferroelectric liquid crystal device, sufficient characteristics cannot be obtained because the alignment state of the liquid crystal having such a monodomain structure is not always formed satisfactorily.

FIG. 4 is a sectional view of a conventional ferroelectric liquid crystal element, and FIG. 5 is a schematic explanatory view showing the state of alignment defects appearing in the conventional ferroelectric liquid crystal element.

That is, the conventional ferroelectric liquid crystal element 40 shown in FIG. 4 has a pair of parallel substrates 41 and 42.
Striped transparent electrodes 43 and 44 having a matrix electrode structure are provided on the substrates 41 and 42, respectively.

Generally, a color filter is composed of red (R), green (G), and blue (B) dyes or a layer containing the dyes, but the film thickness of each dye layer is different regardless of the formation method. Therefore, a step A of about 2000Å to 1 μm is formed. As a result, when the alignment control is performed using the temperature lowering process, the above-mentioned step A causes the alignment defect in the ferroelectric liquid crystal 47 with the step A as a boundary.
Further, when the alignment control films 45 and 46 are provided on the substrates 41 and 42 where the step A exists, the step C formed corresponding to the step A in the alignment control film is almost the same as the film thickness of the pixel. As a result, an alignment defect occurs in the ferroelectric liquid crystal 47 in the same manner as described above.

FIG. 5 is a sketch of the ferroelectric liquid crystal device observed with a crossed Nicol polarization microscope. The white line 51 in the drawing corresponds to the line of a spacer (not shown) used in the liquid crystal device. Lines 52 and 53 are observed corresponding to step C on substrate 41 of FIG. Also, part 5 in the figure
Reference numeral 4 is a ferroelectric liquid crystal sandwiched between opposed electrodes. A large number of blade lines 55 appearing in the polarization microscope represent alignment defects of the ferroelectric liquid crystal.

As described above, the surface in contact with the ferroelectric liquid crystal is 100
If there is a level difference of 0 Å or more, an alignment defect is generated from the level difference, and the monodomain formation of the ferroelectric liquid crystal is hindered.

[0014]

The inventors of the present invention have clarified through experiments that such a step on the substrate causes an alignment defect with respect to the ferroelectric liquid crystal.

An object of the present invention is to provide a color filter substrate and a liquid crystal element which can prevent the occurrence of the above-mentioned alignment defects and can sufficiently exhibit the high-speed response and the memory effect characteristics originally possessed by the ferroelectric liquid crystal element. To provide.

[0016]

Means for Solving the Problems The present inventors have paid particular attention to the initial orientation in the temperature decreasing 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 inventors have found a ferroelectric liquid crystal device having a structure capable of satisfying both the operating characteristics of the device based on the bistability of the ferroelectric liquid crystal and the monodomain property of the liquid crystal layer.

The liquid crystal element of the present invention is based on such knowledge, and more specifically, there is no step on the surface in contact with the liquid crystal layer, that is, the film thickness of the liquid crystal layer is not abruptly changed. Is characterized in that the initial orientation in the temperature lowering process is kept in a good state and a monodomain without orientation defects is formed.

That is, according to the present invention, a film of a colored resin in which a coloring material is dispersed in a low temperature curable polyimide resin having a photosensitive group in the molecule is provided on a substrate, and the film is exposed to light,
A color filter substrate having a color filter obtained by curing, and a protective layer and a patterned transparent electrode being sequentially laminated on the color filter.

Further, according to the present invention, in a liquid crystal device in which a liquid crystal is sandwiched between a pair of parallel substrates having transparent electrodes and a color filter is provided between at least one transparent electrode and the substrate, the color filter of each pixel is photosensitive. Forming a film of a colored resin in which a coloring material is dispersed in a low temperature curable polyimide resin having a functional group in the molecule, exposing the film and curing the film, and forming a protective layer and a pattern shape on the color filter. The liquid crystal element is characterized in that the transparent electrode and the orientation control film are sequentially laminated.

The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the basic structure of a ferroelectric liquid crystal element among the liquid crystal elements of the present invention. In FIG. 1, a ferroelectric liquid crystal element 1 has substrates 2 and 3 using transparent plates such as glass plates or plastic plates, and a ferroelectric liquid crystal 4 is sandwiched between them. On each of the substrates 2 and 3, transparent electrodes 5 and 6 having a stripe pattern for forming a matrix electrode structure are formed.
Is provided, and the orientation control films 7 and 8 are provided on the transparent electrode.
Are formed. Each of the R (red), G (green), and B (blue) color filters is formed by previously setting the concentration of the coloring material so as to obtain desired spectral characteristics with the same film thickness. On the other hand, if necessary, a light shielding layer 10 is formed in the depressions between the color filters, and a protective film or a flattening film 9 is further formed thereon.

In the substrate having the above-mentioned structure, since the step due to the film thickness of the color filter and the depression between the pixels is corrected, even if the transparent electrode and the alignment control film are sequentially formed on the pixel, the substrate surface is almost flat. Can be kept at

In the present invention, the level difference of the color filter substrate can be made 1000 Å or less by the above-mentioned flattening, but it is preferably 500 Å or less.
When the step exceeds 1000 Å, the liquid crystal element using the non-planarizing layer formed with 1200 Å or more, in particular, causes the alignment defect of the edge line shown in FIG. 5 described above.

The low temperature curable polyimide resin having a photosensitive group in the molecule forming the colored resin film of the color filter of the present invention (hereinafter referred to as photosensitive low temperature curable polyimide resin) is a photosensitive group. Aromatic low-temperature curable polyimide resins in the molecule, which do not have specific light absorption characteristics in the visible light wavelength range (400 to 700 nm) (light transmittance of about 90% or more) are preferable. .. From this viewpoint, an aromatic low temperature curable polyimide resin is particularly preferable.

Further, 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 acid esters

[0025]

[Chemical 1]

(Wherein R ₁ is CHX = CY-COO-Z
-, X is -H or -C ₆ H _5, Y is -H or -CH _3,
Z represents-or an ethyl group or a glycidyl group) (2) Benzyl acrylates

[0027]

[Chemical 2]

(Wherein Y represents --H or --CH ₃ ) (3) Diphenyl ethers

[0029]

[Chemical 3]

(Wherein R ₂ is CHX = CY-CONH-,
_{CH 2 = CY-COO- (CH} 2) 2 -OCO-, or _{CH 2 = CY-COO-CH} 2 - which the containing 1 or more,
X and Y have the above-mentioned meanings.) (4) Chalcones and other compound chains

[0031]

[Chemical 4]

(In the formula, R ₃ represents H-, an alkyl group or an alkoxy group)

[0033]

[Chemical 5]

And the like. Specific examples of the aromatic low temperature curable polyimide resin having these groups in the molecule include “Lisocoat PI-400” (trade name, manufactured by Ube Industries, Ltd.) and the like.

Generally, photosensitive resins used in the photolithography process have excellent durability such as mechanical properties, heat resistance, light resistance, and solvent resistance, although there are differences depending on their chemical structures. On the other hand, the photosensitive low temperature curable polyimide resin of the present invention is also a resin system excellent in durability in terms of chemical structure, and the durability of the color filter formed using these is also very good. It will be
In particular, it exhibits excellent performance against heat resistance during sputter formation of a transparent conductive film, which may be a problem as a color filter for a ferroelectric liquid crystal element, and damage to the color filter due to an inner spacer during assembly of a liquid crystal element. ..

The coloring material for 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 a dye is used, the performance of the color filter is governed by the durability of the dye itself. However, when the resin system of the present invention is used, the performance is superior to that of an ordinary dyed color filter. Can be formed. Therefore, the 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 azo pigments such as soluble azo pigments, insoluble azo pigments and condensed azo pigments, phthalocyanine pigments, and indigo pigments, anthraquinone pigments, perylene pigments, perinone pigments, dioxazine pigments, quinacridone pigments, A condensed polycyclic pigment containing an isoindolinone type, a phthalone type, a methine / azomethine type, other metal complex type, or a mixture of some of these is used.

In the present invention, the colored resin used for forming the colored resin layer is the above-mentioned photosensitive low-temperature curable polyimide resin solution, and each of the above-mentioned colored materials having the desired spectral characteristics at the same film thickness of each color is used. It is blended at an arbitrary ratio of about 50%, sufficiently dispersed by ultrasonic waves or three rolls, and then preferably prepared by removing one having a large particle size with a filter of 1 μm or less.

The colored resin layer of the color filter according to the present invention is formed in a pattern by a photolithography process in which the colored resin is applied onto a substrate by a coating device such as a spinner or a roll coater, and the layer thickness is desired. Although it is determined according to the spectral characteristics, it is usually about 0.5 to 5 μm, preferably 0.5 to 1.5 μm, with the same film thickness for each color.
About m is desirable.

When it is necessary to further increase the adhesiveness between the colored resin layer and the underlying substrate, the colored resin pattern is formed on the substrate after being thinly coated with a silane coupling agent or the like, or It is more effective to form a color filter by using a coloring resin containing a small amount of a silane coupling agent or the like.

The colored resin layer included in the color filter of the present invention is made of a good material having sufficient durability by itself, and particularly, the colored resin layer is protected from various environmental conditions. Therefore, or in order to flatten the color filter surface, on the colored resin layer surface,
Polyamide, Polyimide, Polyurethane, Polycarbonate, Silicon-based organic resin, Si ₃ N ₄ , SiO
An inorganic film of ₂ , SiO, Al ₂ O ₃ , Ta ₂ O ₃ or the like can be provided as a protective film or a flattening film by a spin coating method, a roll coating method, or an evaporation method. 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 liquid crystal material and the required response speed. ˜20 μm, preferably 0.5 μm to 10 μm
It is set to the range of.

Further, in order to improve the display characteristics, the light shielding layer can be provided by any of the following three methods. (1) Carbon black or iron black on a photosensitive low-temperature curable polyimide resin similar to that for forming the colored resin layer on either the glass substrate or the colored resin pattern, or on the protective film or the flattening film. , Light-shielding resin in which a light-shielding material such as graphite, copper-chromium-based, copper-iron-manganese-based composite oxide black pigment, or other metal powder having a light-shielding ability is dispersed is used to match the depressions between pixels. , A method of forming a light shielding pattern by a photolithography process.

(2) Either on the glass substrate or on the colored resin pattern, on the protective film or on the flattening film,
Form a metal thin film of chromium, aluminum, etc. that has a light-shielding ability by vapor deposition, sputtering, etc., form a resist mask in accordance with the recess between each pixel, and form a light-shielding pattern by etching away the metal thin film on each pixel how to.

(3) When the colored resin pattern is formed on the glass substrate, the light-shielding pattern is simultaneously formed by superimposing the end portions (about 2 to 15 μm) of each adjacent two colors of the colored resin pattern, A method of providing the protective film or the flattening film in order to flatten the overlapping portion on the color filter layer.

The thickness of the light shielding layer of each of the light shielding patterns is set so that the surface on which the transparent electrode is formed is substantially flattened.

Examples of the material of the orientation control film used in the present invention include polyvinyl alcohol, polyimide, polyamide imide, polyester, polycarbonate, pyrivinyl acetal, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, cellulose resin and melamine. Resins such as resin, urea resin, acrylic resin, photosensitive polyimide, photosensitive polyamide, cyclic rubber photoresist, phenol novolac photoresist or electron beam photoresist (polymethylmethacrylate, epoxidized-1,4-polybutadiene) Such)
It can be selected from the above. Alignment control film 7
Depends on the film thickness of the liquid crystal, but generally 10Å ~ 1
μm, preferably in the range of 100Å to 3000Å.

A particularly suitable 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 phase (SmK ^* ), G phase (S
Liquid crystal of mG ^* ) or F phase (SmF ^* ) can be used.

Regarding this ferroelectric liquid crystal, "LE JOURNAL DE Fijique RUTER"("LE JO
URNAL DE PHYSIQUE LETTRE
S ") 1975, No. 36 (L-69)," Ferroelectric Liquid Crystals "(" Ferro
electric Liquid Crystal
s ");" Applied Physics Letters "
("Applied Physics Letter
s ") 1980, No. 36 (11)," Submicro Second Biasable Electro-Optic Switching in Liquid Crystals "(" Sub
micro Second Bistable Ele
ctropic Switching in Li
"quid Crystals");"Solid State Physics" 198
No. 16 (141), "Liquid crystal", etc., and the ferroelectric liquid crystal disclosed therein can be used in the present invention.

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

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

[0051]

In the color filter substrate of the present invention and the liquid crystal element using the same, the color filter of each pixel is formed to have substantially the same thickness, the transparent electrode and the alignment control film are laminated on the color filter, and the flat surface of the substrate is obtained. Since there is no step on the surface in contact with the liquid crystal phase for good property, the liquid crystal phase sandwiched between the substrates having good flatness is an isotropic phase, and is gradually cooled in the temperature decreasing process of transition to the liquid crystal phase, The liquid crystal phase region gradually expands to form a uniform monodomain liquid crystal phase.

For example, the above-mentioned DOBAMBC showing a ferroelectric liquid crystal phase as a liquid crystal will be described as an example.
When gradually cooling from the isotropic phase of AMBC, it undergoes a phase transition to a smectic A phase (SmA phase) at about 115 ° C. At this time, if the substrate is subjected to alignment treatment such as rubbing or SiO ₂ oblique vapor deposition, the molecular axes of the liquid crystal molecules are
Parallel and unidirectionally oriented monodomains are formed. Further, as the cooling proceeds, the phase transitions to the chiral smectic C phase (SmC ^* phase) at a specific temperature of about 90 to 75 ° C. depending on the thickness of the liquid crystal layer. Further, when the thickness of the liquid crystal layer is about 2 μm or less, the spiral of the SmC ^* phase is unraveled, and bistability is exhibited.

[0053]

EXAMPLES The present invention will be described more concretely with reference to the following examples.

Example 1 FIGS. 6A to 6F are process diagrams showing a process of forming color pixels of R, G, and B colors. First, Corning's # 70
59 A blue colored resin material [Helogen Blue (Helogen Blue (Helogen Blue)
iogen Blue) L7080 (trade name, BASF
Manufactured by C.I. I. No. 74160) to PI-400C
(Product name, Ube Industries, Polymer content = 10%, solvent:
N-methyl-2-pyrrolidone, pigment: polymer = 1: 2
The photosensitive colored resin material prepared by being dispersed in the composition) was applied to a film thickness of 1.5 μm by the spinner coating method to form the colored resin layer 62. (See FIG. 6 (a))

Next, the colored resin layer 62 was prebaked at 80 ° C. for 30 minutes, and then exposed by a high pressure mercury lamp through a photomask 63 corresponding to the pattern shape to be formed. (See FIG. 6 (b))

After the exposure is completed, as shown in FIG. 6C, a dedicated developing solution (development containing N-methyl-2-pyrrolidone as a main component) that dissolves only the unexposed portion of the colored resin layer 62 having the photocured portion 62a. Solution) using ultrasonic waves and treated with a special rinse solution (for example, a rinse solution containing isopropyl alcohol as a main component), followed by post-baking at 200 ° C. for 30 minutes to form a blue pattern. The patterned colored resin layer 64 was formed. (See FIG. 6 (b))

Then, on the glass substrate on which the blue color pattern was formed, the second color green resin material [Lionol Green 6YK] was used.
(Product name, manufactured by Toyo Ink Co., CI No. 7426
Photosensitive colored resin prepared by dispersing 5) in PI-400C (trade name, manufactured by Ube Industries, polymer content = 10%, solvent: N-methyl-2-pyrrolidone, pigment: polymer = 1: 2 blend) Material was used in the same manner as above to form the green patterned resin layer 65 at a predetermined position on the substrate.

Further, as a third color, a red colored resin material [Irgazin Red (IrgazinRe) is formed on the substrate on which the blue and green patterns are formed in this manner.
d) BPT (trade name, Ciba-Gei
gy) company, C.I. I. No. 71127) to PI-40
0C (trade name, manufactured by Ube Industries, polymer content = 10%, solvent: N-methyl-2-pyrrolidone, pigment: polymer =
1: 2 blending) to prepare a photosensitive colored resin material]
In the same manner as above, except that the red patterned resin layer 66 is formed at a predetermined position on the substrate, and R
A colored pattern of three-color stripes of (red), G (green), and B (blue) was obtained. (See FIG. 6 (e))

Next, a black colored resin material [carbon black (CI. No. 77266) was used as a light-shielding layer on a glass substrate on which a three-color coloring pattern was formed, PI-400.
C (polymer content = 10%, pigment: polymer = 1: 4 blended) to produce a light-sensitive colored resin material, and light-shielding is performed in the same manner as above to match the gaps between the pixels. A light shielding layer 67 having a pattern was formed.

On the color filter pattern thus obtained, the same transparent resin material [PI-400C as that used for the colored resin material as the protective film or the flattening film 68 is used.
(Product name, Ube Industries, Polymer content = 10%, solvent:
N-methyl-2-pyrrolidone)] was formed by a spinner coating method to a film thickness of about 1.0 μm. (Fig. 6
(See (f)) As described above, the color filter substrate can be formed in the same plane.

Next, as shown in FIG. 1, ITO was formed into a film with a thickness of 500 Å by a sputtering method to form a transparent electrode 5. As the orientation control film 7, a polyimide forming solution (Hitachi Chemical Co., Ltd. “PIQ”) was applied by a spinner rotating at 3000 rpm and heated at 150 ° C. for 30 minutes to form a 2000 Å polyimide film. After that,
The surface of this polyimide coating was rubbed.

The color filter substrate thus formed and the opposing substrate 3 were bonded together to form a cell group, and a ferroelectric liquid crystal was injected and sealed to obtain a liquid crystal element. When this liquid crystal element was observed with a crossed Nicols polarization microscope, it was confirmed that the liquid crystal molecules inside did not have alignment defects.

[0063]

As described above, according to the present invention, there is no difference in film thickness of the color filter layer on the substrate, and further, if necessary, a light shielding layer, a protective film / planarizing film is provided, It is possible to eliminate a minute step generated between each pixel of the color filter, prevent the occurrence of alignment defects, and provide, for example, a liquid crystal element that can sufficiently exhibit the characteristics of a ferroelectric liquid crystal. ..

Further, according to the present invention, a color filter portion having a fine pattern excellent in mechanical strength and excellent in various properties such as heat resistance, light resistance and solvent resistance can be produced by a simple manufacturing process. It becomes possible to manufacture, and it is possible to easily provide a color liquid crystal device having excellent performance.

[Brief description of drawings]

FIG. 1 is a sectional view showing a basic structure of a ferroelectric liquid crystal device according to the present invention.

FIG. 2 is a perspective view schematically showing a ferroelectric liquid crystal used in the present invention.

FIG. 3 is a perspective view schematically showing a ferroelectric liquid crystal used in the present invention.

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 appearing in a conventional ferroelectric liquid crystal element.

FIG. 6 is a process drawing showing a process of forming a color pixel of the present invention.

[Explanation of symbols]

 1 Substrate 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 Alignment Control Film 9,48, 68 Protective film (flattening film) 10, 67 Light-shielding layer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nobuyuki Sekimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (8)

[Claims] 1. A color obtained by providing a film of a colored resin in which a coloring material is dispersed in a low temperature curable polyimide resin having a photosensitive group in the molecule on a substrate, exposing the film, and curing the film. A color filter substrate having a filter, wherein a protective layer and a patterned transparent electrode are sequentially laminated on the color filter. 2. A light-shielding layer pattern made of a light-shielding resin in which a light-shielding material is dispersed in an aromatic low-temperature-curable polyimide resin having a photosensitive group in the molecule is formed in each of the recesses between the pixels of the color filter. 2. The color filter substrate according to claim 1, wherein the color filter substrate is provided so as to have a thickness substantially equal to that of the pixel, and a surface for forming the transparent electrode is substantially flattened. 3. The light-shielding layer made of a metal material is provided in the depressions between the pixels of the color filter so as to have a thickness substantially equal to the thickness of each pixel, and the surface forming the transparent electrode is substantially flattened. Color filter substrate. 4. A light-shielding layer is formed by overlapping one portion of each two adjacent pixels of the color filter, and a flattening film is provided on the color filter so that a surface on which a transparent electrode is formed is substantially flattened. The color filter substrate according to claim 1. 5. A liquid crystal device having a liquid crystal sandwiched between a pair of parallel substrates having transparent electrodes and a color filter between at least one transparent electrode and the substrate, wherein the color filter of each pixel has a photosensitive group as a molecule. A film of a colored resin in which a coloring material is dispersed in a low temperature curable polyimide resin contained therein is provided, and the film is formed by exposing and curing the film, and a protective layer on the color filter, a transparent electrode having a pattern shape, and A liquid crystal element comprising an alignment control film sequentially laminated. 6. A light-shielding layer pattern made of a light-shielding resin obtained by dispersing a light-shielding material in an aromatic low-temperature-curable polyimide resin having a photosensitive group in the molecule in each of the recesses between pixels of the color filter. 6. The liquid crystal device according to claim 5, wherein the liquid crystal device is provided with substantially the same thickness as the pixel, and the surface on which the transparent electrode is formed is substantially flat. 7. The light-shielding layer made of a metal material is provided in the depressions between the pixels of the color filter so as to have a thickness substantially equal to the thickness of each pixel, and the surface forming the transparent electrode is substantially flattened. Liquid crystal element. 8. A light-shielding layer is formed by overlapping one portion of each two adjacent pixels of the color filter, and a flattening film is provided on the color filter so that a surface on which a transparent electrode is formed is substantially flattened. 6. The liquid crystal element according to claim 5.