JPS62124505A - Color filter and its production - Google Patents

Abstract

PURPOSE:To extremely easily and efficiently obtain a color filter having water- resistant color filter layers by having a hydrophobic resin layer to be dyed formed on the surface of a base and hydrophobic dyes which are contained in the resin layer to be dyed and dye the resin layer to be dyed to a pattern shape. CONSTITUTION:The thin film-like hydrophobic resin layer 3 is the resin layer 3 to be dyed if the thin film-like hydrophobic resin layer 3 is formed over the entire surface including electrodes 2 of a glass substrate 1 by coating a soln. of a hydrophobic resin which can be colored on the electrode 2 forming surface on the substrate 1 and drying. A sizing material layer 4 (41, 42, 43) contg. the hydrophobic dye is then coated and formed at the prescribed points on the hydrophobic resin layer 3 to be dyed by a screen printing method to the prescribed pattern shape and is then dried. The dried sizing material layer 4 of three colors is subjected to a heating treatment, for example for about 60-90sec at about 180-200 deg.C. The water soluble sizing material layer 4' (41', 42', 43') of which the dye is migrated to the layer 3 is easily removed from the dye layer 3 by rinsing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used, for example, in electro-optical display devices such as liquid crystal display elements and electrochromic display elements, solid-state image carriers, and imaging devices such as image pickup tubes. , e.g. striped,
The present invention relates to a color filter having a predetermined pattern such as a heptad pattern, and a method for manufacturing the same.

[Prior Art] As methods for producing patterned color filters of this type, there are mainly two well-known methods: (a) a printing method and (b) a photolithography method. In other words...
... <a> A method of printing color printing ink in a pattern on a support by a printing method such as screen printing (for example,
JP-A-56-21182, JP-A-58-4632
See Publication No. 5, etc. ) (b> A method of dyeing a hydrophilic resin layer formed on a support in a pattern with a water-soluble dye by photolithography (for example, Japanese Patent Application Laid-Open No. 58-102
See JP-A No. 214, JP-A-59-155830, JP-A-59-191015, etc. )・・・・・・
In these publications, after a photosensitive resin layer is formed by applying a photosensitive resin prepared by adding medium chromate, diazo compound, etc. as a photosensitizer to a hydrophilic resin such as gris, gelatin, or polyvinyl alcohol onto a support, A mask with a lobe pattern in a predetermined shape is placed on this photosensitive resin layer, and exposed and developed to form a hydrophilic dyeing (!!resin layer).
Next, a Robaturn resisting mask layer made of a hydrophobic photosensitive resin is formed on this resin layer to be dyed, and the exposed portions of the hydrophilic resin layer to be dyed are dyed with an aqueous solution containing a water-soluble dye. Furthermore, to form a single layer of multi-color color filters, the other layer is made of a hydrophobic photosensitive resin, and another layer of the hydrophilic dyed resin layer is exposed by a water-soluble dye of different colors through a pattern resisting mask layer. Parts are stained.

The former (a) printing method using color ink has the advantage of being able to form a single layer of color filter very easily, but the film thickness cannot be made small and is usually about 30 microns thick. This results in a thick film.

Therefore, when applied to a color liquid crystal display device (see above-mentioned public IFi) in which a liquid crystal layer and a color filter layer are not interposed in the electrode gate, the driving voltage must be increased to apply a sufficient voltage to the liquid crystal layer. It is difficult to make the thickness of a single layer of the non-nolar filter uniform, and the uniformity of electro-optical characteristics such as alignment unevenness and display unevenness is impaired.

In addition, according to the latter method (b), in which a hydrophilic resin layer to be dyed is dyed with an aqueous solution of a water-soluble dye, a single layer of an i9 film-like color filter of about 0.1 micron to 1 micron is placed on a support. However, in order to form color filters of multiple colors by dyeing with water-soluble dyes, multiple photolithography processes and multiple steps of forming a dye resisting mask layer are required, making workability difficult. However, it had the disadvantage of poor yield.

In addition, if water remains or enters the water-soluble dye and hydrophilic resin layer that make up one layer of the color filter, the water-soluble dye may dissolve and bleed into other parts, or water may be absorbed by the hydrophilic resin layer. There were drawbacks such as the swelling and the thickening of the filter layer.

[Problems to be Solved by the Invention] Therefore, the main purpose of the present invention is to solve the former (a) mentioned above.
In addition to eliminating various drawbacks due to the thick film of the color filter layer produced by the prior art (b), the manufacturing method of the color filter layer produced by the prior art (b) is complicated, has poor workability, and has a low yield. This method eliminates the disadvantage of poor water resistance due to the single layer of the resulting color filter being made of a hydrophilic resin dyed with a water-soluble dye.

Another main object of the present invention is to provide a method for manufacturing a color filter having a single thin film, water-resistant color filter layer.

[Means for solving problems]. In order to achieve the object of the present invention described in E, the nonolar filter of the present invention has a hydrophobic resin layer to be dyed formed on the surface of the support and a resin layer to be dyed included in the resin layer to be dyed. In the method for manufacturing a color filter of the present invention, a glue layer containing a hydrophobic dye is formed in a predetermined pattern on a hydrophobic resin layer to be dyed; Next, by heat treatment, the hydrophobic dye in the wood layer is thermally diffused into the resin layer to be dyed, and then the glue layer is removed from the resin layer to be dyed.

1 Effect J In the present invention, even if a thick adhesive layer containing a hydrophobic dye is formed on a thin hydrophobic resin layer to be dyed by a printing method, the thick adhesive layer is The intermediate layer is finally removed from above the hydrophobic dyed resin layer, so the completed color filter layer is a thin film-like hydrophobic dyed layer in which the hydrophobic dye is thermally diffused and dyed. Since it is composed of only a resin layer, it is possible to obtain a single layer of a thin film-like and water-resistant color filter using a simple manufacturing method.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

An embodiment of the manufacturing method of the present invention will be described with reference to FIGS. 1 to 5.

1 to 4 are cross-sectional views, not showing the process order, of an embodiment in which the present invention is applied to a method of manufacturing a multicolor color filter for a color liquid crystal display device, and FIG. 5 is a cross-sectional view of this method. FIG. 2 is a cross-sectional view of a color filter obtained by the method.

As shown in FIG. 1, after forming a transparent conductive layer of tin oxide, indium oxide, etc. on a glass substrate (transparent support) 1 by means such as vacuum evaporation or sputtering, a large number of stripes are formed by photolithography. Alternatively, a mosaic-like transparent electrode 2 (21, 22, 23, . . . ) is formed. Note that a striped or mosaic-shaped transparent electrode 2 may be formed by screen-printing a conductive paste for forming a transparent electrode onto the substrate 1 and then baking it.

Next, as shown in FIG. 2, a solution of a hydrophobic resin that can be dyed by diffusing a hydrophobic dye by heating is applied onto the surface on which the electrodes 2 are formed on the glass substrate 1 by a spinner method, a dipping method, etc. , to form a thin hydrophobic tree layer 3 on the entire surface of the glass substrate 1 including the electrodes 2 and having a thickness of about 1 micron or less (for example, about 0.1 micron) after drying. This thin film-like hydrophobic tree layer 3 becomes the resin layer 3 to be dyed.

Examples of the hydrophobic resins mentioned above include vinyl resins such as polyvinyl chloride, polynylidene chloride, polystyrene, polypropylene, and fluorine resins, cellulose ester resins such as cellulose diacetate and cellulose triacetate, methyl methacrylate, and ethyl chloride. Examples include hydrophobic thermoplastic resins such as acrylic resins such as acrylate, polyester resins such as polycarbonate, and polyethylene terephthalate.To apply the above thermoplastic resin onto the support 1 by a spinner method, a dipping method, etc. In order to substantially liquefy the thermoplastic resin from the liquefaction section, (A) dissolve the resin in an appropriate solvent, or (B) disperse fine powder of the resin in an appropriate solution. (j) It is necessary to heat the above resin to make it into a molten liquid.

The above (A>) includes polyvinyl chloride (agent A: toluene, cyclohexane, nitrobenzene, methylene chloride, etc.), cellulose diacetate-1 to <solvent: acetone to methyl alcohol, methylene chloride, etc.>, cellulose triacetate (solvent: chloroform, ethyl alcohol, methylene chloride, etc.), and polycarbonate (solvent: methylene chloride, trichlene, metacresol, etc.).

In addition, the above (B) includes an aqueous dispersion obtained by emulsion polymerization of polyvinyl acetate, an aqueous dispersion obtained by emulsion polymerization of methyl methacrylate, polyacrylic ester, polyvinylidene chloride,
Fine particles of thermoplastic resin such as polyvinyl propionate, polystyrene, saturated polyester, and fluororesin with a size of about 2 microns or less, preferably about 0.05 to 0.05 microns, are stirred in water or ultrasonically imaged. These dispersions can be heated at low temperatures after application*2.
It is dried and then heat treated to the melting point of the thermoplastic resin to form a transparent continuous coating.

Examples of the above (C) include a heated melt of a thermoplastic resin such as polystyrene.

Next, as shown in FIG. 3, a transom layer 4 (4L 42.43) containing a hydrophobic dye is coated on the hydrophobic resin layer 3 to be dyed in a predetermined pattern at a predetermined location using a screen printing method. formed and then dried.

In FIG. 3, a transom layer 41 containing a hydrophobic dye of a first hue such as red (R) is applied for the first time on the dyed resin layer 3 at locations corresponding to striped or mosaic electrodes 21. It is formed by a screen printing method and dried, and then by a second screen printing method, a second color such as blue (B) is printed on the resin layer 3 to be dyed at the locations corresponding to the second striped or mosaic electrodes 22. A transom layer 42 containing a hydrophobic dye with a hue of
A transom layer 43 containing a hydrophobic dye of a third hue such as green (G) is formed on the dyed resin layer 3 at a location corresponding to 3 and dried.

These glue vJ layers 4 (41, 42, 43) are formed by the screen printing method, so they are about 30 microns thick, but they are intermediate layers in the manufacturing process and are later coated with the resin to be dyed. Note that this does not pose any problem since it is removed from above layer 3.

The transom of the transom layer 4 is made of wheat starch, dextrin, sodium alginate, gelatin, methyl cellulose, carboxyl methylcellulose (CMC), natural rubber, partially saponified polyvinyl alcohol (PV), etc.
It is preferable to use a water-soluble adhesive such as synthetic adhesive such as A). By using a water-soluble adhesive, it is possible to easily obtain a viscosity suitable for screen printing by adjusting the amount of water. , the transom layer 4 that is no longer needed after heat dyeing,
It can be easily removed from the dyed resin layer 3 by washing with water.

The dye to be included in the above-mentioned transom layer 4 is a hydrophobic (insoluble in water) powdered dye, and it is desirable to use a disperse dye that is well thermally diffused and dyed into the hydrophobic resin by heat treatment.

Examples of the dye names of this disperse dye include red dyes such as Kemiton First Pink RL, KaX Freon First Red R1 Varanyl Scarlet 3R, Duranol Red 2B, and Seriton First Pink FF3B. Examples of blue dyes include Dianix First Blue GS, Miketon First Navy Blue BRL, Seriton Brilliant Blue FRN, and Seriton First Blue B.
Examples of green dyes include Seriton First Brilliant Green 3G, Miketon First Green GL, Miketon First Green BL, and Seriton First Green 3.
Examples include B.

An example of the composition of a transom in which a disperse dye is dispersed, which is easy to screen print, is a composition of the disperse dye, warm water, and glue (F ratios of 0.2 to 8, 34.8 to 32 degrees, 65 to 60 degrees, respectively). or 0
．． 2~8.39.8~32°60.

Thereafter, the dried three-color transom layer 4 shown in FIG.
For example, by heating a melon at 180 to 20 degrees Celsius for about 160 to 90 seconds, R, B, and G as shown in FIG.
The dye diffuses and moves from the glue 44 layer 41, 42, 43 into the dyed resin layer 3 corresponding to the transom layers 41, 42, 43 containing dye of each color R, B,
The dye G is dyed into the resin FIs to be dyed. Furthermore, 41
', 42-143' indicate the transom layer 4' to which the dye has been transferred, 31, 32, and 33 indicate the hydrophobic dyed resin layers dyed in red, blue, and green, respectively, and 34 indicates the dyed resin layer. Undyed portion w of the resin layer 3 indicates a transparent portion.

Next, the water-soluble glue 44 layer 4 = (41', 42', 43-) in which the dye has migrated to the dyed resin layer 3 shown in FIG. removed from above.

Finally, as shown in Figure 5, the resin layer 3 to be dyed is dried.
Then, the disperse dyes of three colors R, B, and G are diffused in a stripe-like or mosaic-like pattern in different regions in the ig-removable hydrophobic dyed resin layer 3 on the support (glass substrate) 1,
A three-color dyed multicolor filter is completed. 3
L 32 and 33 are hydrophobic dyed resin layers dyed red, blue, and green, respectively, and 34 is an undyed dyed resin layer.

Note that if the transom layer 4 is printed by a well-known offset printing method instead of the screen printing method of the above embodiment, a color filter layer with a finer pattern can be obtained.

FIG. 6 shows a specific example in which the color filter shown in FIG. 5 is applied to a multicolor liquid crystal display device.

In FIG. 6, the glass substrate shown in FIG.
Transparent electrodes 21.22.2 formed in stripes on 1
R, B is formed on 3 in a stripe or mosaic pattern.
, G dyed 3L 32.33 The dyed resin layer 3 is rubbed in a predetermined direction to form an alignment film that also serves as a Nocoler filter, and is used as one electrode substrate 1, and a transparent electrode patterned in a striped pattern in the same manner. 6 is formed on the glass substrate (
An alignment film 8 is provided in a predetermined direction on the support) 5 to form the other electrode slope 5, and the electrode surfaces of both substrates 1.5 are made to face each other, and both striped electrodes 2 (21, 22, 23 )
and 6 are perpendicular to each other, the peripheries of both 4 and 4 plates 1.5 are sealed with a peripheral sealing material 7 while maintaining a predetermined gap, and the well-known liquid crystal injection method is used to seal the peripheries of both 4 and 4 plates 1.5. When the liquid crystal 9 is injected and the injection port is sealed with a well-known sealing material, XY
A matrix electrode type multicolor liquid crystal display device is obtained.

This multicolor liquid crystal display device has a color filter layer 3 (31R
132B, 33G, 34 colorless) can be formed into a thin, uniform thickness of about 2 microns or less, the driving voltage of the liquid crystal 9 can be lowered, and the color filter layer 3
Since the hydrophobic (water-insoluble) disperse dye is diffused and dyed into the hydrophobic resin, the sealing performance of the peripheral sealing material 7 and the injection port sealing material deteriorates, and some moisture may enter from the outside. Even if the dye penetrates, the resin layer 3 to be dyed will not soften or swell due to moisture, the film thickness will not change, and the alignment performance will not deteriorate, and the dye will not dissolve in the water and ooze into the liquid crystal 9. can be avoided.

Next, another embodiment of the present invention will be described with reference to the sectional views shown in FIGS. 7 and 8.

As shown in FIG. 7, 3t! ! A transom layer 41 containing a dye of
．． 42.43 as the electrode 21.22.2 on the resin layer 3 to be dyed
Form at the location corresponding to 3. In this embodiment, the electrode 21
．． Transom layers 41 (R), 42 (B), 43 (G>) containing dyes of three colors are formed on the dyed resin layer 3 in a width slightly wider than the width of 22.23.
．． Cover the part of the transom layer 41.42.43 that protrudes a little beyond the width of the transom layer 41.42.43, and apply, for example, Ceritazol STN, Dai7nix.
A transom layer 50 containing a black disperse dye such as Fast Black GS or Terrasil Black is applied by screen printing and dried.

After that, as shown in FIG. 8, for example, 150 to 200
By performing heat treatment for about 160 to 90 seconds at a temperature of C, the dye in the transom layers 41, 42, 43, and 50 is diffused and transferred into the corresponding resin layer 3 to be dyed, and is dyed therein.

41', 42', 43-150' indicate transom layers to which the dye has migrated. Also, 3L 32.33 are R, B, and G respectively.
3 shows a portion of the dyed resin layer 3 that has been dyed, and 34 indicates a black dyed portion of the dyed resin layer 3 that has been dyed except for these three-color dyed portions.

The transom layer 41' indirectly attached to the resin layer 3 to be dyed
, 42', 43=, 50- are removed by washing with water,
A color filter shown in FIG. 9 is obtained.

This color filter consists of a striped transparent electrode lIf! on a transparent support 1. R and B on 21.22.23 respectively
, the adjacent l color filter layer 31.3 dyed in G
Since the gap between 2.33 and 33 mm is completely blackened by the dyed black resin layer 34, it is possible to prevent color flooding, and
Contrast can be improved.

FIG. 10 and FIG. 11 show still other embodiments of the present invention,
FIG. 9 shows a method of manufacturing a color filter similar to that shown in FIG.

As shown in FIG. 10, after a transom layer 50 containing a black dye is formed by screen printing on the dyed resin layer 3 of the transparent support 1 on which transparent electrodes 21, 22, 23 are formed, 3f! Transom layer 4 containing each of the dyes R, B, and G of A
1.42.43 are formed by performing screen printing three times in total.

After that, when heat treatment is performed, the three color dyes and black dye in the transom layer 41, 42, 43, 50 are removed as shown in the first figure.
It diffuses and moves into the resin layer 3 to be dyed corresponding to these particles, thereby obtaining the resin layers 31, 32, and 33 to be dyed in three colors and the black dyed layer 34 adjacent thereto.

Transom layer 41', 42=, 43' where the dye moved last
, 50' are removed by washing with water, a color filter similar to that shown in FIG. 9 is obtained.

In the embodiments of the present invention described above, a color filter used in a multicolor liquid crystal display device and a method for manufacturing the same have been explained. It can be applied to various other methods of manufacturing color filters.

In the examples described below, the support (i.e., the base) on which the color filter layer is formed is a glass substrate on which electrodes are formed in advance, but the color filter layer obtained by the present invention is hydrophobic. The color dye is diffused into the hydrophobic resin layer to be dyed by heat treatment and has relatively good heat resistance, so after forming the color filter layer on the glass substrate, relatively low temperature treatment such as vacuum evaporation is applied. It is also possible to form electrodes.

Further, when the object is a color imaging device such as a solid-state image carrier, the support is the light receiving surface thereof, and the electrodes of the support are unnecessary.

[Effects of the Invention] As has become clear from the above explanation, in the present invention, in addition to forming a hydrophobic resin layer to be dyed on a support, a printing method such as a screen printing method or the like can be applied on the resin layer to be dyed. to form a transom layer containing a hydrophobic dye, then by heat treatment, the hydrophobic dye in the rope layer is thermally diffused and dyed into the resin layer to be dyed, and finally the transom layer is removed from the support. Therefore, a color filter with a water-resistant color filter layer can be obtained very easily and efficiently.

Further, since the transom layer is water-soluble, after the hydrophobic dye in the rope layer is dyed onto the resin layer to be dyed by thermal diffusion, the transom layer can be removed by dissolving it in an aqueous solution.

Furthermore, since the hydrophobic resin layer to be dyed is formed into a thin film having a uniform thickness on the support, the resin layer to be dyed itself becomes a color filter layer. Therefore, it is possible to obtain a thin film-like water-resistant color filter layer with a uniform film thickness, and when used as a color filter layer for a color liquid crystal display device, the driving voltage can be lowered, and the electro-optical characteristics can be improved. good,
A long-life color liquid crystal display device can be obtained.

[Brief explanation of drawings]

FIGS. 1 to 4 are cross-sectional views showing an embodiment of the present invention in the order of steps, FIG. 5 is a cross-sectional view of a color filter according to the above-mentioned embodiment, and FIG. FIG. 7 and FIG. 8 are cross-sectional views not showing other embodiments of the present invention;
FIG. 9 is a sectional view of a color filter obtained in this example. FIGS. 10 and 11 show still other embodiments of the present invention.
FIG. In the figure, 1, 5...Support (glass substrate)
, 2, 21.22.23...Transparent electrode, 3.-
...Hydrophobic dyed resin layer, 31.32.33...
... Color filter layer (R, B, G colors, respectively), 4
．． 41.42.43... Glue layer containing dyeing II, 4', 41', 42=, 43'... Transom layer, 6... Electrode , 7... peripheral sealing material,
9...LCD. Above glue color film I rec layer 1411 transparent electrolyte? 11th class 11th JE q bow electric 4 box color filled! layer 3

Claims (6)

[Claims] (1) In a color filter comprising a resin layer to be dyed formed on the surface of a support rod and a dye contained in the resin layer to be dyed and dyeing the resin layer to be dyed in a pattern, the resin layer to be dyed is hydrophobic. 1. A color filter, characterized in that the color filter is made of a hydrophobic resin, and the dye is a hydrophobic dye. (2) The color filter according to claim 1, wherein the hydrophobic resin is a thermoplastic resin. (3) The color filter according to claim 1, wherein the hydrophobic dye is a disperse dye. (4) In a method for producing a color filter comprising a resin layer to be dyed formed on the surface of a support and a dye contained in the resin layer to be dyed and dyeing the resin layer to be dyed in a pattern: from a hydrophobic resin. a first step of forming a glue layer containing a hydrophobic dye in a predetermined pattern on the resin layer to be dyed by a printing method; A color filter comprising: a second step of diffusing and dyeing into the resin layer to be dyed; and a third step of removing the glue layer from above the resin layer to be dyed. Production method. (5) The adhesive layer is water-soluble, and after the hydrophobic dye in the adhesive layer is dyed onto the resin layer to be dyed by thermal diffusion, the adhesive layer is dissolved in an aqueous solution and removed. A method for producing a color filter according to claim 4. (6) The method for manufacturing a color filter according to claim 4, wherein a plurality of adhesive layers containing hydrophobic dyes of different hues are formed in a predetermined pattern on the hydrophobic resin layer to be dyed. .