JPH04264404A - Color filter and liquid crystal display using the same - Google Patents

Abstract

PURPOSE:To suppress a decrease in the light beam transmissivity of a color filter due to pigment particles and to improve the contrast ratio of the liquid crystal display, etc., by the suppression of the decrease in the light beam transmissivity. CONSTITUTION:This color filter is formed by forming a transparent colored layer 14 on a transparent substrate 11 by dispersing the pigment particles 15a in a transparent resin base material 15. Particulates of transparent resin which is colored with dye are used as said pigment particles 15a. Pigment particles having dye layers for color correction nearby the surfaces may be used instead. The dye layers for color correction are obtained by chemically coupling dye molecules with the surfaces of pigment particles, coloring the surfaces of pigment particles, or forming resin layers dyed in a correction color.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter used in, for example, a liquid crystal display device capable of full color display, and a liquid crystal display device using the same.

0003

[Prior Art] Liquid crystal display devices are commonly used in portable computers,
It is used in displays for word processors, flat-screen televisions, etc., and in recent years, devices capable of full-color display have also appeared. Demand for full-color liquid crystal display devices is rapidly increasing, and along with this, liquid crystal display devices are being made lower in price, larger in area, and higher in quality.

FIG. 4 shows a TFT (thin film transistor), which is one of the active matrix drive methods.
(nsistor) shows a cross-sectional structure of an active matrix type liquid crystal display device. In general, a color filter 1 used in a full-color liquid crystal display device is first provided with a light blocking layer, that is, a black matrix 3, having a predetermined pattern on a transparent substrate 2, and this black matrix 3
Transparent colored layers 1a, 1b, 1c are formed on the pixel portion formed by
A transparent protective film 4, ITO (Indiu
It has a structure in which a transparent electrode 5 and an alignment film 6 made of a material such as (mTin Oxide) are laminated in this order. A liquid crystal display device is manufactured by sandwiching a liquid crystal 9 between the color filter 1 and a transparent substrate 8 provided with individual electrodes 7 on the inside, and by arranging polarizing plates 10 and 11 on the outside thereof. is configured.

By the way, the transparent colored layers 1a, 1b, 1
c is formed by arranging three types of dyes that selectively transmit the three primary colors of R, G, and B, one type in each pixel portion. As described above, various methods are known for placing pigments in pixel areas, and methods currently in practical use include dyeing methods, pigment dispersion methods, printing methods, and electrodeposition methods. . However, each method has its advantages and disadvantages, and at present no widely used method has been established.

For example, the dyeing method had the disadvantage of low heat resistance during heat treatment of ITO films, but recently methods have been developed to form low resistance films at relatively low temperatures (IEICE Technical Report). Vol.90 No.190 EID9
0-37), heat resistance is no longer the main issue. However, since the photosensitive liquid is applied onto the substrate and then dyed with a predetermined dye, there remains the problem that the process becomes complicated and the manufacturing cost increases. Furthermore, the pigment dispersion method has a problem in that light is absorbed by the pigment particles dispersed in the resin base, resulting in a decrease in light transmittance. Such a decrease in light transmittance causes a depolarization phenomenon, resulting in, for example, a decrease in the contrast ratio of a liquid crystal display device. Furthermore, the printing method also improves the surface flatness of the transferred transparent colored layer.
The accuracy of the transferred pattern shape and the accuracy of pattern positioning are inferior to other methods, and the electrodeposition method requires electrodes to be formed on the transparent substrate in advance, so there is a high degree of freedom in pixel arrangement. The disadvantage is that it is small. As described above, the current methods for forming transparent colored layers each have various drawbacks, but from the viewpoint of the stability of the manufacturing process, the pigment dispersion method developed as an application of photolithography is superior. If this problem can be solved, it is expected that it will be possible to stably mass-produce color filters.

On the other hand, in methods such as pigment dispersion methods and printing methods, in which pigment particles are dispersed in a binder for coloring, the pigments that can be used are limited to some extent due to dispersibility and other factors. Therefore, in order to obtain the desired chromaticity, it is necessary to perform color correction, and a simple method is generally to add pigment particles of the corrected color at the same time. However, when two or more types of pigment particles are dispersed in order to perform color correction, the above-mentioned absorption and scattering of light becomes more pronounced as the amount of dispersed pigment particles increases, making it difficult to use the color filter. For example, there is a problem in that the contrast ratio of a liquid crystal display device is significantly reduced.

[0008]

[Problems to be Solved by the Invention] As mentioned above, in conventional color filters, sufficient light transmittance cannot be obtained, so that the contrast ratio of liquid crystal display devices etc. using the color filters may be reduced. In addition, there were problems such as a complicated manufacturing process. Furthermore, in connection with the decrease in light transmittance, color correction cannot be freely performed, which also causes a problem in that the contrast ratio decreases. Therefore, as for the method of forming a transparent colored layer itself, it is desired to form a transparent colored layer with a relatively simple manufacturing process and less decrease in light transmittance. Furthermore, from the viewpoint of color correction, it is desired to be able to easily perform desired color correction without reducing light transmittance. The present invention has been made to address such problems, and aims to provide a color filter that has excellent light transmittance and can be obtained through a relatively simple manufacturing process. It is an object of the present invention to provide a liquid crystal display device with improved characteristics such as contrast ratio by using such a color filter.

[Configuration of the invention]

0010

[Means for Solving the Problems] That is, the first color filter of the present invention includes a transparent substrate, a transparent colored layer provided on the substrate, and having pigment particles dispersed in a transparent resin base material. The color filter is characterized in that the pigment particles are made of transparent resin fine particles dyed with a dye.

A second color filter according to the present invention is a color filter comprising a transparent substrate and a transparent colored layer provided on the substrate and having pigment particles dispersed in a transparent resin base material. The pigment particles are characterized in that they have a dyed part for color correction near the surface thereof.

[0012] The liquid crystal display device of the present invention has a transparent first layer on which a transparent colored layer and a transparent electrode layer are sequentially provided.
a second substrate disposed opposite to the first substrate with a predetermined gap and having an electrode layer on the opposing surface side; a liquid crystal sandwiched in the gap; A liquid crystal display device having polarizing plates disposed on the outside of each of the substrates, characterized in that the transparent first substrate and the transparent colored layer are constituted by any of the above-mentioned color filters. .

[0013]

[Function] In the first color filter of the present invention, since fine particles of transparent resin dyed with a dye are used as pigment particles, a decrease in light transmittance due to the transparent colored layer can be suppressed. In addition, since the transparent colored layer itself can be formed by applying a conventional pigment dispersion method,
It can be formed through a relatively simple manufacturing process.

[0014] Furthermore, in the second color filter,
Since a dyed portion is provided in the vicinity of the surface of the pigment particles and color correction is performed on the pigment particles themselves, it is possible to form a color-corrected transparent colored layer using only one type of pigment particles. Therefore, it is possible to prevent an increase in pigment particles due to color correction,
This can prevent an increase in the decrease in light transmittance of the transparent colored layer.

By using such a color filter, in the liquid crystal display device of the present invention, it becomes possible to suppress the occurrence of the depolarization phenomenon, thereby making it possible to improve the contrast ratio.

[0016]

EXAMPLES The present invention will now be explained in detail by way of examples.

First, an embodiment of the first color filter according to the present invention will be described. FIG. 1 is a sectional view showing the structure of a color filter according to an embodiment of the present invention. In the figure, 11 is a transparent substrate made of blue plate glass or the like, and a black matrix 12 made of a Cr thin film is formed on this transparent substrate 11. This black matrix 12 is formed, for example, by sputtering Cr into a predetermined pattern. The above black matrix 12 is
A large number of pixel portions 13 are formed by the pattern, and each of these pixel portions 13 constitutes a color filter.
Three transparent colored layers 14a, 14b, and 14c that selectively transmit the three primary colors of R, G, and B are formed, respectively.

The transparent colored layers 14a, 14b, and 14c are each constructed by dispersing pigment particles 15a made of fine particles of transparent resin dyed in a desired color with a dye into a transparent resin base material 15b. has been done. Transparent resin materials that are the source of the pigment particles 15a include, for example, acrylic resins, vinyl chloride resins, alkyd resins, aromatic sulfonamide resins, urea resins, melanin resins, benzoguanamine resins, and cocondensation polymers and mixtures thereof. Synthetic resins such as Then, by dyeing these transparent resins with dyes of colors corresponding to R, G, and B and pulverizing them, transparent and dyed pigment particles 15a are obtained. Alternatively, a transparent resin that has been crushed in advance may be dyed. This particle size is 0.
The thickness is preferably 3 μm or less.

Transparent colored layers 14a and 14b using such transparent pigment particles 15a dyed in a desired color
, 14c is, for example, a photosensitive transparent resin base material 15
It can be formed by repeatedly dispersing the pigment particles 15a in B, coating this dispersion on the transparent substrate 11, and developing it into a desired pattern depending on each color.

A transparent protective film 16 made of acrylic resin, epoxy resin, or the like is formed on the transparent colored layers 14a, 14b, and 14c, and a transparent electrode 17 made of ITO or the like is further formed. And this transparent electrode 1
An alignment film 18 made of a polyimide resin thin film or the like is provided on the color filter 19 to constitute a color filter 19.

Next, a specific example of the first color filter having the above configuration and its evaluation results will be described. Example 1 First, a block of acrylic resin is dyed with an azo dye, a phthalocyanine dye, and an anthraquinone dye, and then subjected to a coarse crushing process and a crushing process to obtain particles with an average particle size of approximately 0.1 μm.
15 transparent red, green, and blue pigment particles, respectively.
A was prepared respectively. Next, the pigment fine particles 15a thus obtained were dispersed in a solvent-soluble resin solution, and a polymerization monomer and a photopolymerization initiator were added to prepare three types of resist solutions.

On the other hand, a black matrix 12 made of a Cr thin film having a predetermined pattern was formed on a blue plate glass substrate 11 by sputtering. Then, on this black matrix 12, the pigment particles 15 of the first color described above are placed.
A resist solution containing a is spin-coated, a desired pattern is left by development, and the transparent colored layer 14a of the first color is formed.
was formed. Next, patterning by spin coating and development was performed in the same manner for the second and third color resist solutions to form second and third color transparent colored layers 14b and 14c.

After that, the transparent colored layers 14a, 14b,
After forming the transparent protective film 16 on the transparent protective film 14c, a transparent electrode 17 made of ITO was formed by sputtering, and an alignment film 18 made of polyimide resin was further formed to complete the color filter 19. Example 2 Acrylic resin particles having an average diameter of about 0.1 μm were dyed with an azo dye, a phthalocyanine dye, and an anthraquinone dye to produce transparent red, green, and blue pigment particles 15a, respectively. Next, the pigment particles 15a thus obtained were each dispersed in a solvent-soluble resin solution, and a polymerization monomer and a photopolymerization initiator were added to prepare three types of resist solutions.

[0024] Thereafter, a color filter 19 was produced in the same manner as in Example 1 using the above three types of resist solutions.

Comparative Example 1 As pigment particles corresponding to each color, dianthraquinone pigment (corresponding to red color), halogen copper phthalocyanine pigment (corresponding to green color), and copper phthalocyanine pigment (corresponding to blue color) having an average particle diameter of about 0.1 μm were used. A color filter was produced by the pigment dispersion method in the same manner as in Example 1 above, except that fine particles were used in each case.

Each color according to these examples and comparative examples
A TFT active matrix liquid crystal display device having the structure shown in FIG. 1 was manufactured using a filter, and
Light transmittance was measured. The results are shown in Table 1.

[0027]
Table 1

Example 1 Example 2 Comparative example 1 Light transmittance 1 (wavelength 450 nm) 21
22 16 Light transmittance 2 (wavelength 546 nm) 23
22 17
Light transmittance 3 (wavelength 700nm) 2
3 23 17
As is clear from the results shown in Table 1, all of the liquid crystal display devices using the color filters according to the examples
It had an excellent light transmittance compared to that using a color filter made by the conventional pigment dispersion method (comparative example), and also good results were obtained in terms of chromaticity.

Next, an embodiment of the second color filter according to the present invention will be described. This color filter also has a basic structure similar to that of the first color filter described above, so it will be explained with reference to FIG. 1.

The color filter in this embodiment includes pigment particles 15a having dyed portions for color correction in the vicinity of the surface;
For example, dianthraquinone pigment particles (for red color), halogen copper phthalocyanine pigment particles (for green color), and copper phthalocyanine pigment particles (for blue color) are placed on a transparent resin base 1.
It has transparent colored layers 14a, 14b, and 14c of three colors corresponding to the three primary colors of R, G, and B, which are dispersed in the transparent colored layer 5b. In addition, the correction colors are red, yellow for green,
As for blue, purple is common. As a method for dyeing the surface portion of the pigment particles 15a, for example, (a) a color correction dye containing a group reactive with a group in the pigment is applied to the surface of the pigment particle; The dye molecules combine to form a surface stain for color correction.

(b) After the pigment particles absorb the primer, the primer and developer are reacted on the surface of the pigment particles to form a dyed area for color correction on the surface of the pigment particles.

(c) A resin layer dyed with a correction color is formed on the surface of the pigment particles.

[0032] etc. are exemplified.

Specific examples of the methods (a) to (C) above are shown below.

[0034] In the above method (a), the method for bonding the dye molecules to the surface of the pigment particles includes, for example, covalent bonding and hydrogen bonding. For example, assume that Lake red 4 particles expressed by the following formula (1) are used as a red pigment.

[0035]

[Chemical formula 1]

On the other hand, as a correction color, for example, Direct Yellow 4 expressed by the following equation (2)
4 or Direct Ye expressed by the following formula (3)
When a yellow direct dye having a proton-donating group such as llow 4 is applied, a hydrogen bond is formed with the -N=N- group in the pigment.

[0037]

[Case 2]

[0038]

[Chemical formula 3]

Alternatively, as a yellow reactive dye, for example, Reactive Ye represented by the following formula (4)
low 2 or Reac expressed by the following formula (5)
When tive Yellow 3 or the like is applied, it reacts with the -OH group in the pigment to form a covalent bond represented by the following formula (6).

[0040]

[C4]

[0041]

[C5]

[0042]

[C6]

[0043] All of the above reactions are difficult to proceed to the inside of the pigment particles, and the dyeing group of the correction color is bonded to the surface of the pigment particles. Further, by appropriately changing the type of dye, reaction conditions, etc., the degree of reaction between the pigment particles and the dyeing group can be changed, so color correction can be performed freely. In addition, when performing the above color correction, for example, if -NH2 groups etc. are present in the pigment molecule, the color correction in the dye
-SO3 May cause electrostatic bonding with Na group. However, in this case, the bond strength is only improved by secondary bonding, and there is no particular problem. Also,
If a problematic bond occurs, the target group may be protected by applying an appropriate protecting group.

[0044] In addition, as a green pigment, the following (7
) Green Gold particles expressed by the formula (8) below, and C.I. I. Vat Green 1
Suppose we use particles of

[0045]

[C7]

[0046]

[Chemical formula 8]

For these, the above (
2) Direct Yellow 44 expressed by the formula and Direct Yellow 4 expressed by the formula (3)
By acting with a yellow dye such as, hydrogen bonding occurs with the -N=N- group or -OR group in the pigment, and a dyed layer for color correction can be formed on the surface.

Furthermore, as pigments for blue color, the following (
9) C. I. Assume that Vat Blue 4 particles are used.

[0049]

[Chemical formula 9]

On the other hand, Dir-ect V expressed by the following formula (10) is used as a purple dye which is a correction color.
iolet 1 or Dir expressed by the following formula (11)
When ect Violet 7 or the like is applied, hydrogen bonds expressed by the following formula (12) occur, and a dyed layer for color correction can be formed on the surface.

[0051]

[Chemical formula 10]

[0052]

[Chemical formula 11]

[0053]

[Chemical formula 12]

Next, the method (b) above will be explained. In method (b), first, the primer is absorbed onto the surface of the pigment particles. For example, when purple is used as the correction color, naphthol AS represented by the following formula (13), which is a coupling component, is absorbed. Next, this primer and a color developer, for example, a diazo compound represented by the following formula (14), are reacted on the pigment particles to form a combined color. In this case, a correction color of purple (for example, Azoic Violet 1 expressed by the following equation (15)) can be dyed. Even in this method, it is possible to obtain various hues by appropriately selecting the type of primer, reaction conditions, etc.

[0055]

[Chemical formula 13]

[0056]

[Chemical formula 14]

[0057]

[Chemical formula 15]

Next, the method (c) above will be explained. This method (c) is a method in which a resin layer dyed with a correction color is formed on the surface of the pigment particles. As a specific method for forming a resin layer dyed in a correction color, for example,
The surface of pigment particles having a particle size of about 0.1 μm is coated with a dyeable resin by a dipping method, a spray method, or the like. As the coating resin, acrylic resin polymers, ethyl cellulose polymers, and the like are preferable in consideration of adhesion to pigment particles, chemical resistance, heat resistance, and the like. For example, when coating with an acrylic resin polymer, the resin solution is coated and then heat treated at a temperature of about 200° C. or lower to harden it. Thereafter, the cured product is pulverized to a desired particle size. Through the above steps, the surfaces of the pigment particles are entirely or partially covered with the dyeable resin.

Next, the dyeable resin is dyed with a correction color. When using yellow as the correction color, for example, DisperseYellow expressed by the following equation (16)
3 or Disperse expressed by the following equation (17)
When using a dye such as Yellow 7, or when using a purple color, Disperse expressed by the following formula (18)
Violet 1 or D expressed by the following formula (19)
The dyeable resin is dyed using a dye such as isperse Violet 4.

[0060]

[Chemical formula 16]

[0061]

[Chemical formula 17]

[0062]

[Chemical formula 18]

[0063]

[Chemical formula 19]

[0064] In this way, even when dyeing the dyeable resin coated on the surface of pigment particles with a correction color,
The hue can be controlled by the type of dye, dyeing conditions, type and condition of resin, etc.

In addition, in the method for forming a resin layer dyed with a correction color as described above, the surface of the pigment particles is coated with a dyeable resin and then dyed with a correction color. A similar effect can be obtained by coating the surface of the pigment particles with a resin. In this case,
First, a dyeable resin is dyed with a correction color dye as described above. Next, this dyed resin is dissolved in a solvent to obtain a resin solution with an appropriate concentration. Then, after coating the surface of the pigment particles with this resin solution, it is cured to form a dyed resin layer. The dyes and resins used in this case can be the same as those used in the above-mentioned method.

Next, a specific example of the second color filter having the above configuration and its evaluation results will be described. Examples 3 and 4 First, as a red pigment, La represented by the above formula (1)
Direct Yellow expressed by the above formula (3) is used as ke Red 4 and as a yellow dye which is a correction color.
I prepared w 4. Using this yellow dye, dye 5%,
Conditions of 10% sulfur salt (Example 3), and dye 10%
% and 20% copper salt (Example 4), and the red pigment particles having an average particle size of about 0.5 μm were immersed in these dye baths to form hydrogen bonds. We created two types of red pigments with different hues by dyeing only the surface area with a correction color. In addition, as a green pigment, Green Go represented by the above formula (7)
ld fine particles were prepared, and two types of color-corrected pigment particles were produced in the same manner as the red pigment described above.

Furthermore, as a blue pigment, C.I. I. Vat Blue 4 and D expressed by the above formula (10) as a purple dye which is a correction color.
Direct Violet 1 was prepared. Using this purple dye, dye baths were prepared under the conditions of 7% dye and 15% sulfur salt (Example 3) and the conditions of 10% dye and 20% sulfur salt (Example 4). The above blue pigment particles having an average particle size of about 0.5 μm were respectively immersed in water to form hydrogen bonds, thereby producing two types of blue pigment particles having different hues with only the surface portions dyed with a correction color.

FIG. 2 shows the CIE chromaticity diagram of the two types of pigments corresponding to the three primary colors thus obtained. Note that the comparative example in the figure is a pigment compatible with three primary colors before color correction. As is clear from FIG. 2, it can be seen that the color-corrected pigment particles according to the above examples can expand the color reproduction range, and can obtain any hue by changing the dyeing conditions.

[0069] Next, color filters were produced using the above two types of three primary color pigment particles in the same manner as in Example 1, and a liquid crystal display device was also produced. Also, regarding pigment particles before color correction,
Similarly, a color filter and a liquid crystal display device were manufactured.

When the contrast ratio of the color filters obtained in the example and comparative example thus obtained was measured, the contrast ratio of the color filter of the comparative example was about 200, whereas the contrast ratio of the color filters of examples 3 and 4 was I was also able to improve it to about 650. In addition,
The above contrast ratio is a value obtained by sandwiching a color filter between polarizing plates and dividing the luminance when the polarizing plates are parallel by the luminance when the polarizing plates are crossed. Furthermore, no increase in the debiasing phenomenon was observed.

Furthermore, when the screen contrast ratio of the liquid crystal display devices according to the above embodiment and comparative example was measured, it was found that at a screen brightness of 70 Cd/m3, the liquid crystal display device according to the comparative example had a maximum contrast ratio of 12:1. The ratio of the liquid crystal display devices according to the examples were all 19:1 at maximum, which was a significant improvement.

Example 5 Pigment particles corresponding to the three primary colors include a dianthraquinone pigment (corresponding to red), a halogen copper phthalocyanine pigment (corresponding to green), and a copper phthalocyanine pigment (corresponding to blue).
Different types of pigment particles were prepared.

First, Disperse Ye represented by the above formula (16) is added to the red pigment and the green pigment.
Pigment particles for red and green having a corrected color resin layer with an average particle size of 0.5 μm were prepared by coating each acrylic polymer dyed with LOW 3 and then pulverizing it. Similarly, for the blue pigment, DisperseViolet expressed by the above formula (19)
A resin layer dyed with No. 4 was formed.

C of the pigment corresponding to the three primary colors thus obtained
The IE chromaticity diagram is shown in FIG. Note that the comparative example in the figure is a pigment compatible with three primary colors before color correction. As is clear from FIG. 3, it can be seen that the color-corrected pigment particles according to the above examples can expand the color reproduction range.

Next, a color filter was produced using the three primary color pigment particles described above in the same manner as in Example 1, and a liquid crystal display device was also produced. Furthermore, color filters and liquid crystal display devices were similarly produced using pigment particles before color correction.

When the contrast ratio of the color filters obtained in the example and comparative example thus obtained was measured, it was found that the color filter according to the comparative example had a contrast ratio of about 200, whereas the color filter according to the example had improved to about 500. I was able to do it. Furthermore, no increase in the debiasing phenomenon was observed.

[0077] In the above embodiment, a color filter for a full-color liquid crystal display device was explained as an example, but the present invention is not limited thereto, and can be applied to color filters for various devices.

[0078]

As explained above, according to the color filter of the present invention, it is possible to prevent a decrease in light transmittance due to pigment particles, so that, for example, a liquid crystal display device with an excellent contrast ratio can be stably manufactured. It becomes possible to provide Further, since the above-described color filter can be obtained through a relatively simple process, it greatly contributes to cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a color filter according to an embodiment of the present invention.

FIG. 2: CIE of a color filter according to an embodiment of the present invention.
FIG. 4 is a diagram showing a chromaticity diagram in comparison with a conventional color filter.

FIG. 3: C of a color filter according to another embodiment of the present invention.
FIG. 3 is a diagram showing an IE chromaticity diagram in comparison with a conventional color filter.

FIG. 4 is a cross-sectional view showing the structure of a conventional full-color TFT active matrix liquid crystal display device.

[Explanation of symbols]

11...Transparent substrate 12...Black matrix 13...Pixel section 14...Transparent colored layer 15a...Pigment particles 15b...Transparent resin base material 16...Transparent protective film 17...Transparent electrode 18...Alignment film 19...Color filter

Claims (3)

[Claims] 1. A color filter comprising a transparent substrate and a transparent colored layer provided on the substrate and having pigment particles dispersed in a transparent resin base material, wherein the pigment particles are colored with a dye. A color filter characterized by being made of transparent resin particles. 2. A color filter comprising a transparent substrate and a transparent colored layer provided on the substrate in which pigment particles are dispersed in a transparent resin base material, wherein the pigment particles are present in the vicinity of the surface thereof. A color filter characterized in that it has a dyed part for color correction. 3. A transparent first substrate having a transparent colored layer and a transparent electrode layer sequentially provided on the surface thereof, and an electrode disposed on the opposite surface side, which is disposed facing the first substrate with a predetermined gap. In the liquid crystal display device, the liquid crystal display device includes a second substrate having a layer, a liquid crystal sandwiched in the gap, and polarizing plates disposed outside the first and second substrates, respectively.
A liquid crystal display device, wherein the substrate and the transparent colored layer are constituted by the color filter according to claim 1 or the color filter according to claim 2.