JP2020144347A - Color filter substrate and liquid crystal display - Google Patents

Abstract

To provide, as a main purpose, a color filter substrate that can make natural the hue of reflection in a liquid crystal display.SOLUTION: A color filter substrate comprises: two optical functional members; and a color filter member provided between the two optical functional members. Both the two optical functional members have a phase difference layer, and the phase difference layers both have a function as a 1/4λ member that has reverse wavelength dispersibility and gives a phase difference by a 1/4 wavelength to transmitted light.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a color filter substrate and a liquid crystal display device.

In recent years, with the development of personal computers, especially portable personal computers, the demand for liquid crystal display devices has increased. In addition, recently, the penetration rate of home-use liquid crystal televisions is increasing, and smartphones and tablet terminals are also becoming widespread, so that the market for liquid crystal display devices is expanding more and more.

A liquid crystal display device generally includes a color filter substrate, a facing substrate, and a liquid crystal panel having a liquid crystal layer arranged between them. Further, the liquid crystal display device has, for example, a configuration in which a backlight source, a first linear polarizing plate, a liquid crystal panel, and a second linear polarizing plate are arranged in this order (Patent Document 1).

International Publication No. 2013/122155

It is required to make the display of the liquid crystal display device easier to see in a bright environment such as outdoors. One of the reasons why the display visibility is low in a bright environment is that the reflected light of the external light inside the liquid crystal panel is observed by the observer. In recent years, in order to suppress reflection of external light inside a liquid crystal panel, a color filter is arranged between two 1 / 4λ retardation plates whose slow axes are orthogonal to each other as a color filter base material for an LCD (Liquid Crystal Display). A low-reflection panel configuration has been proposed. In such a configuration, the transmitted light from the backlight returns to the original polarization mode by passing through two 1 / 4λ retardation plates whose slow axes are orthogonal to each other. On the other hand, the incident external light is converted into linearly polarized light by passing through the linear polarizing plate, and is converted into circularly polarized light by passing through the 1 / 4λ retardation plate. That is, the linear polarizing plate and the retardation layer function as circular polarizing plates. The external light due to this circular polarization is subsequently reflected by the back surface transparent electrode and the black matrix layer, but at the time of this reflection, the rotation direction of the polarizing surface is reversed. As a result, the reflected light is converted into linearly polarized light in the direction of being shielded by the linear polarizer by the 1/4 wavelength plate, which is the opposite of that at the time of arrival, and then shielded by the subsequent linear polarizer, and as a result, to the outside. Emission is suppressed. However, the reflection of external light inside the liquid crystal panel cannot be completely suppressed, and there is a problem that the color of the reflection becomes unnatural with purple, especially when displayed in black.

The present disclosure is an invention made in view of the above problems, and a color filter substrate capable of making the color of reflection of external light reflection inside a liquid crystal panel natural, and a liquid crystal display device using the same. The main purpose is to provide.

The present disclosure is a color filter substrate including two optical functional members and a color filter member provided between the two optical functional members, and both of the two optical functional members have a retardation layer. However, the retardation layers all provide a color filter substrate having anti-wavelength dispersibility and functioning as a 1 / 4λ member that imparts a phase difference of 1/4 wavelength to transmitted light.

According to the present disclosure, both of the two optical functional members have a retardation layer, and both of the retardation layers have opposite wavelength dispersibility, and further, the transmitted light is about 1/4 wavelength. Since it has a function as a 1 / 4λ member that imparts a phase difference, it is possible to prevent reflection of external light generated inside the liquid crystal panel in the liquid crystal display device and to make the color of the reflected light natural. It becomes a possible color filter substrate.

In the above disclosure, it is preferable that either or both of the retardation layers in the two optical functional members contain a liquid crystal material. This is because if it contains a liquid crystal material, it can be a retardation layer exhibiting more suitable inverse wavelength dispersibility.

In the above disclosure, the retardation layer in the optical functional member installed on the side where the outside light is incident (outside side) has a retardation value Re (450) at a wavelength of 450 nm with respect to a retardation value Re (550) at a wavelength of 550 nm. ) Ratio Re (450) / Re (550) is preferably 0.9 or less. With such a retardation layer having anti-wavelength dispersibility, it can surely function as a 1 / 4λ member in each wavelength region, and the tint of reflection can be made natural.

In the above disclosure, the retardation layer in the optical functional layer (inside side) installed on the side opposite to the side where the outside light is incident also has the same degree of inverse wavelength dispersibility as the retardation layer set on the outside side. It is preferable to have. Specifically, it is preferable that the difference between the phase difference value on the inside side and the phase difference value on the outside side is within ± 5% at each wavelength of 450 nm, 550 nm, and 650 nm. This is because it is possible to suppress a decrease in contrast of the liquid crystal display device.

In the above disclosure, the color filter substrate further has a linear polarizing plate, and one of the retardation layers in the two optical functional members is internally combined with incident light by the combination with the linear polarizing plate. It is preferable that the color difference ΔE * ab from the reflected light of the external light is less than 20. This is because if the color difference ΔE * ab is less than 20, the difference in color between the incident light and the reflected light cannot be clearly recognized.

The present disclosure provides a liquid crystal display device including at least a liquid crystal panel having the above-mentioned color filter substrate, an opposed substrate, and a liquid crystal layer arranged between the said color filter substrate and the said opposed substrate.

According to the present disclosure, by having the above-mentioned color filter substrate, the color of external light reflection generated inside the liquid crystal panel can be made natural.

In the present disclosure, the liquid crystal display device includes the two optical functional members, the color filter member, and two linear polarizing plates so as to sandwich the liquid crystal layer, and the two linear polarizing plates have different polarization directions. The retardation layers in the two optical functional members are arranged so as to be orthogonal to each other, and the optical axes of the retardation layers are arranged so as to be orthogonal to each other, and the optical axis of the linear polarizing plate and the optical axis of the retardation layer are arranged. The angle formed by the light crystal is preferably 45 °.

The color filter substrate of the present disclosure has an effect that the color of the external light reflection of the liquid crystal display device can be made natural.

It is the schematic cross-sectional view which illustrates the color filter substrate of this disclosure. It is schematic cross-sectional view which illustrates the liquid crystal display device of this disclosure. It is explanatory drawing explaining the behavior of the light source light and the outside light in the liquid crystal display device of this disclosure. It is explanatory drawing explaining the optical compensation state of the optical functional member in this disclosure. It is a graph explaining the positive dispersibility of a retardation layer, and the ideal dispersibility that a retardation is always 1 / 4λ regardless of a wavelength. A graph showing a graph in which the wavelength in the visible light region is on the horizontal axis and the retardation value (x) / retardation value (550) is on the vertical axis for each retardation layer. (A) is a schematic diagram showing the configuration of the liquid crystal panel designed in the simulation, and (B) is a diagram showing the simulation results in L * a * b * coordinates. It is a process drawing which illustrates the manufacturing method of the color filter substrate. It is a process drawing which illustrates another example of the manufacturing method of a color filter substrate.

Hereinafter, embodiments of the present disclosure will be described with reference to drawings and the like. However, the present disclosure can be implemented in many different embodiments and is not construed as being limited to the description of the embodiments illustrated below. Further, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the embodiment, but this is merely an example and the interpretation of the present disclosure is limited. It's not something to do. Further, in the present specification and each of the drawings, the same elements as those described above with respect to the above-described drawings may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate. Further, for convenience of explanation, the phrase "upper" or "lower" may be used for explanation, but the vertical direction may be reversed.

Further, in the present specification, there is no particular limitation when a certain component such as a certain member or a certain area is "above (or below)" another structure such as another member or another area. As long as this includes not only the case of being directly above (or directly below) the other configuration, but also the case of being above (or below) the other configuration, that is, separately above (or below) the other configuration. Including the case where the component of is included.

The present inventors have investigated a phenomenon in which the color of external light reflection inside a liquid crystal panel becomes purple in a liquid crystal display device. Then, the present inventors consider that the appearance of the low-reflection panel at the time of reflection depends on the characteristics of the circularly polarizing plate (the retardation layer and the linear polarizing plate), and the wavelength dispersion of the 1 / 4λ retardation layer is positive dispersion. , It was found that the color of the reflection becomes purple. That is, conventionally, in order to minimize the reflectance and to reduce the reflectance of green (wavelength of 550 nm), which is highly sensitive to humans, it is necessary to set the phase difference of the wavelength of 550 nm to 1 / 4λ. It was. However, when a normal 1/4 wave plate made of a positively dispersible material is used, the phase difference of the 550 nm wavelength is 1/4 λ as shown in the dotted line graph shown in FIG. 5, but the wavelength is different from the wavelength of 550 nm. (Short wavelength side (blue region) and long wavelength side (red region)) do not have a phase difference of 1 / 4λ (blue region has a phase difference larger than 1 / 4λ, red region has a phase difference smaller than 1 / 4λ. ). For example, in the case of a wavelength of 620 nm, the phase difference is preferably 155 nm, but is actually around 133 nm. Therefore, it was found that the reflectance does not decrease in the blue and red wavelength regions, so that the color of the reflection becomes purple and the color becomes unnatural. The linear graph of FIG. 5 shows the ideal dispersibility in which the phase difference is always 1 / 4λ regardless of the wavelength.

Therefore, in order to investigate the effect of wavelength dispersibility on the tint of reflected light, the present inventors have set the wavelength in the visible light region as the horizontal axis and Re (x) for a plurality of retardation layers having different wavelength dispersibility. A simulation survey was conducted with the slope of the graph with / Re (550) on the vertical axis as the wavelength dispersibility. The obtained results are shown in FIG. Re (x) is a phase difference value (in-plane retardation value) at a wavelength of xnm.

In FIG. 6, sim_0.80 is the in-plane retardation value Re (550) of the retardation layer for transmitted light having a wavelength of 550 nm and the in-plane retardation value Re (in-plane) of the retardation layer for transmitted light having a wavelength of 450 nm. Sim_0.85, a simulation layer in which the wavelength dispersibility value represented by the ratio of (450) (Re (450) / Re (550)) is 0.80, is a retardation layer for transmitted light having a wavelength of 550 nm. The wavelength dispersibility value represented by the ratio of the in-plane retardation value Re (450) to the transmitted light having a wavelength of 450 nm with respect to the in-plane retardation value Re (550) is 0.85. It is a simulation layer like this. The resin film 1 is a polycarbonate film (product name "Pure Ace WR", manufactured by Teijin Co., Ltd.), the resin film 2 is a cycloolefin polymer film (product name "Zeonoa", manufactured by Nippon Zeon Co., Ltd.), and the liquid crystal layer 1 is JP-A-2019. A polymerizable liquid crystal material having a wavelength dispersibility of 1.03 was used with reference to JP-A-14890, and a polymerizable liquid crystal material having a wavelength dispersibility of 1.09 was used for the liquid crystal layer 2 with reference to JP-A-2017-138401. I am using it.

Next, the in-plane retardation value Re (450) of the retardation layer with respect to the transmitted light having a wavelength of 450 nm with respect to the in-plane retardation value Re (550) with respect to the transmitted light having a wavelength of 550 nm, which was investigated above. The liquid crystal display panel of FIG. 7A was designed using each of the retardation layers having different wavelength dispersibility represented by the ratio (Re (450) / Re (550) as a 1 / 4λ plate, and the polarizing plate 71. A simulation was performed to calculate the tristimulus value XYZ in accordance with the international standard (CIE / ISO) for the external light reflection of the liquid crystal display panel having the 1 / 4λ plate 72 and the ideal reflecting plate 73 that reflects 100%. The stimulus value XYZ was converted to the L * a * b * color system in the USC (color equality space). The result can be displayed at the L * a * b * coordinates in FIG. 7 (B). Reflection. The perceived color difference between the light and the incident light can be obtained by the distance ΔE * ab between the USC coordinates. As shown in Table 1, a retardation layer having a inverse dispersion with a wavelength dispersibility value of less than 1. In the case of, it was found that ΔE * ab became smaller.

An LCD master manufactured by Shintec Co., Ltd. was used for the simulation. By using this software, it is possible to perform optical simulation when the retardation layer is made into multiple layers, and it is possible to calculate the reflectance and the color change of the reflected light.

From the above results, the present inventors have provided retardation layers made of a material having antidispersity as shown in FIG. 6 above and below the color filter member, so that the retardation layers are provided in each wavelength region. We have found that it can function as a 1 / 4λ member and can give a natural appearance to the reflected color, and have completed the present invention.

Furthermore, the present inventors have identified an in-plane retardation value Re (450) of the retardation layer for transmitted light having a wavelength of 550 nm and an in-plane retardation value Re (450) of the retardation layer for transmitted light having a wavelength of 450 nm. The color difference ΔE * ab was calculated by simulation for the simulation layer in which the wavelength dispersibility value represented by the ratio (Re (450) / Re (550) was 0.80 to 1.00). Is shown in Table 2.

From the above results, the present inventors may set the value of the color difference ΔE * ab of the reflected light with respect to the incident light to less than 20 in the case of the retardation layer having the wavelength dispersibility value of 0.90 or less. I found out what I could do.

A. Color filter substrate The color filter substrate of the present disclosure is a color filter substrate including two optical functional members and a color filter member provided between the two optical functional members, and is a color filter substrate of the two optical functional members. Both have a retardation layer, and each of the retardation layers has a reverse wavelength dispersibility and functions as a 1 / 4λ member that imparts a phase difference of 1/4 wavelength to transmitted light. It is a substrate.

The color filter substrate of the present disclosure will be described with reference to the drawings. 1 (a) and 1 (b) are schematic cross-sectional views showing an example of the color filter substrate of the present disclosure. As shown in FIGS. 1 (a) and 1 (b), the color filter substrate 10 of the present disclosure has a collar arranged between two optical functional members 1A and 1B and two optical functional members 1A and 1B. It includes a filter member 2. In the present disclosure, both the two optical functional members 1A and 1B have anti-wavelength dispersibility, and further have a function as a 1 / 4λ member that imparts a phase difference of 1/4 wavelength to the transmitted light. It has retardation layers 11A and 11B. The retardation layers 11A and 11B are formed on the alignment layers 12A and 12B in FIG. 1A, and are bonded by the adhesive layers 13A and 13B in FIG. 1B.

As shown in FIGS. 1A and 1B, the color filter member 2 usually includes a transparent base material layer 21 and a plurality of colored layers 22 arranged on one surface of the transparent base material layer 21. Have at least. 1 (a) and 1 (b) show an example in which the red colored layer 22R, the green colored layer 22G, and the blue colored layer 22B are provided as the plurality of colored layers 22. Further, the color filter member 2 may have a light-shielding layer 23 in a region that overlaps the boundary region of the colored layer 22 in a plan view. Further, in the color filter member 2, the protective layer 24 may be arranged on the surface of the colored layer 22 opposite to the transparent base material layer 21 side.

FIG. 2 is a schematic cross-sectional view showing an example of a liquid crystal display device using the color filter substrate of the present disclosure. As shown in FIG. 2, the liquid crystal display device 100 of the present disclosure includes a color filter substrate 10, a facing substrate 20, and a liquid crystal layer 30 arranged between the color filter substrate 10 and the facing substrate 20. It has at least 100A. The liquid crystal display device 100 may further include, for example, a backlight 50, a first linear polarizing plate 40A, and a second linear polarizing plate 40B. The first linear polarizing plate 40A and the second linear polarizing plate 40B are arranged so that the polarization directions are orthogonal to each other, for example.

FIG. 3 is an explanatory diagram illustrating the behavior of light source light (transmitted light) and external light (reflected light) in the liquid crystal display device shown in FIG. First, the behavior of the light source light T will be described. The light source light T emitted from the backlight 50 in the liquid crystal display device is natural light Lom including light in all vibration directions. In the liquid crystal display device 100, linearly polarized Lline (0) having a vibration direction in one direction is emitted from the first linear polarizing plate 40A from the natural light Lom of the light source light T, and is incident on the liquid crystal layer 30. The linearly polarized Lline (0) is converted into the linearly polarized Lline (90) by, for example, causing a phase difference of λ / 2 depending on the liquid crystal material in the liquid crystal layer 30. Next, the linearly polarized Lline (90) is converted into the circularly polarized Lc by being incident on the optical functional member 1A. The circularly polarized Lc is incident on the color filter member 2 and further incident on the optical functional member 1B to convert the circularly polarized Lc into the linearly polarized Lline (90). The linearly polarized Lline (90) has a vibration direction parallel to the polarization direction of the second linear polarizing plate 40B. Therefore, the linearly polarized Lline (90) passes through the second linear polarizing plate 40B and is observed by the observer.

Next, the external light R will be described. In the liquid crystal display device 100, the external light R is omnidirectional light Lom. When the external light R is incident on the second linear polarizing plate 40B, the linearly polarized Lline (90) having a vibration direction in one direction is selected from the omnidirectional light Lom. The linearly polarized Lline (90) is converted into circularly polarized Lc by being incident on the optical functional member 1B. Next, the circularly polarized Lc is reflected by the configuration of the color filter member, so that the phase changes by λ / 2. For example, when the circularly polarized Lc before reflection is a clockwise circular polarization, the circularly polarized Lc (Rev) after reflection is a counterclockwise circular polarization. The reflected circularly polarized Lc (Rev) is converted into linearly polarized Lline (0) by being incident on the optical functional member 1B again. Since the vibration direction of the linearly polarized Lline (0) is orthogonal to the polarization direction of the second linear polarizing plate 40B, it cannot pass through the second linear polarizing plate 40B, and the observer sees the linearly polarized Lline. (0) is not observed.
However, conventionally, since the retardation layer having a function as a 1/4 wavelength member usually has a positive wavelength dispersibility, external light reflection inside the liquid crystal panel cannot be completely suppressed and is reflected. There was a problem that the color of the light crystal became unnatural with purple.

In the present disclosure, since the retardation layer is a reverse-dispersive retardation layer that imparts a phase difference of 1/4 wavelength to transmitted light, it exhibits good circular deflection characteristics in each wavelength region. Therefore, the color of the external light reflection of the liquid crystal display device can be made natural.
Hereinafter, the color filter substrate of the present disclosure will be described for each configuration.

1. 1. Optical functional member In the color filter substrate, the two optical functional members are members arranged so as to sandwich the color filter member. Hereinafter, the optical functional member arranged on one surface side of the color filter member is referred to as a first optical functional member, and the optical functional member arranged on the other surface side of the color filter member is referred to as a second optical functional member. It may be referred to and explained. Further, the layer constituting the first optical functional member will be referred to as a "first" layer, and the layer constituting the second optical functional member will be referred to as a "second" layer. The optical functional member in the present disclosure has a function as a λ / 4 member in a general optical functional member.

(1) Phase Difference Layer According to the present disclosure, both of the two optical functional members have an inverse wavelength dispersive retardation layer that imparts a phase difference of 1/4 wavelength to the transmitted light.

(I) Inverse dispersibility In the present disclosure, the first retardation layer and the second retardation layer have inverse dispersibility. Hereinafter, "inverse dispersibility of the retardation layer" will be described.
In general, depending on the type of the retardation layer, the same retardation value may not be exhibited in the entire visible light region, and the retardation value on the short wavelength side and the retardation value on the long wavelength side may be different. Specifically, depending on the material used for the retardation layer, the phase difference value on the short wavelength side in the visible light region may be larger than the phase difference value on the long wavelength side, or the phase difference value on the short wavelength side may be the long wavelength. It may be smaller than the phase difference value on the side. Here, the inverse wavelength dispersibility is a wavelength dispersion characteristic in which the phase difference in transmitted light is smaller toward the shorter wavelength side, and more specifically, in-plane retardation (Re ₄₅₀ ) at a wavelength of ₄₅₀ nm and a wavelength of 550 nm. The relationship between the in-plane retardation (Re ₅₅₀ ) and the in-plane retardation (Re ₅₅₀ ) at the wavelength of ₅₅₀ nm and the in-plane retardation (Re ₆₅₀ ) at the wavelength of 650 nm are the wavelength dispersion characteristics of Re ₄₅₀ <Re _550. ) Is the wavelength dispersion characteristic of Re ₅₅₀ <Re ₆₅₀ .

The in-plane retardation value is an index indicating the degree of birefringence in the in-plane direction of the refractive index variant, and the refractive index in the slow-phase axial direction, which has the largest refractive index in the in-plane direction, is Nx. When the refractive index in the phase-advancing axis direction orthogonal to the slow-phase axis direction is Ny and the thickness in the direction perpendicular to the in-plane direction of the refractive index variant is d.
Re [nm] = (Nx-Ny) x d [nm]
It is a value represented by. The in-plane retardation value (Re value) can be measured by the parallel Nicol rotation method using, for example, KOBRA-WR manufactured by Oji Measuring Instruments Co., Ltd. The in-plane retardation value of a minute region can also be measured using an AxoScan manufactured by AXOMETRICS (USA) using a Mueller matrix.

In this way, the retardation layer, which is arranged on the observer side and functions as a circularly polarizing plate together with the linearly polarizing plate, has inverse dispersibility, so that the color of the reflection of external light reflection inside the liquid crystal panel is natural. It becomes possible to. Further, since the retardation layer in the optical functional member arranged on the opposite side of the color filter member also has reverse dispersibility, it is possible to obtain a liquid crystal display device in which a decrease in contrast is suppressed in a bright environment. ..

In particular, in the present disclosure, the in-plane retardation value Re (550) of the retardation layer for transmitted light having a wavelength of 550 nm and the in-plane retardation value Re (450) of the retardation layer for transmitted light having a wavelength of 450 nm. , And the in-plane retardation value Re (650) of the retardation layer with respect to the transmitted light having a wavelength of 650 nm preferably satisfies the following relationship.
Re (450) / Re (550) ≤ 0.90
Above all
0.80 ≤ Re (450) / Re (550) ≤ 0.86,
In particular, 0.82 ≤ Re (450) / Re (550) ≤ 0.84
It is preferable to satisfy the relationship of.

In this disclosure,
Re (550) / Re (650) ≤ 0.977,
Above all
0.949 ≤ Re (550) / Re (650) ≤ 0.966,
In particular, 0.955 ≤ Re (550) / Re (650) ≤ 0.960,
It is preferable to satisfy the relationship of. This is because it is possible to prevent color leakage from either side of the long wavelength side on the short wavelength side and obtain reflected light having a natural color tone.

By satisfying the relationship of Re (450) / Re (550) ≤ 0.90, the value of the color difference ΔE * ab of the reflected light with respect to the incident light is set to less than 20 as shown in Table 2 described above. Can be done. The color difference ΔE * ab refers to the color difference defined by JIS Z8781.
In the present disclosure, ΔE * ab is preferably less than 20.

Here, when ΔE * ab is 20 or more, it is a value that is managed at the color name level as described in “New Color Science Handbook, 2nd Edition, Page 290”. That is, the difference in color between the incident light and the reflected light becomes clear. Therefore, by setting ΔE * ab to the above-mentioned value or less, it is possible to obtain the reflected light having a natural color tone instead of the reflected light having a special color tone.

In the present disclosure, it is preferable that the retardation layer in the above two optical functional members satisfies the relationship that the difference in retardation is within ± 5% at each wavelength of 450 nm, 550 nm, and 650 nm. That is, assuming that the retardation value of the first retardation layer at the wavelength λ is Re1 (λ) and the retardation value of the second retardation layer is Re2 (λ).
-5% ≤1- (Re1 (λ) / Re2 (λ)) ≤ + 5%, λ = 450, 550, 650 nm
It is preferable to satisfy.
This is because it is possible to suppress a decrease in contrast of the liquid crystal display device.

(Ii) Composition of retardation layer The retardation layer in the present disclosure is a layer that imparts a function as a λ / 4 plate to an optical functional member. The retardation layer may be formed of a liquid crystal compound having an inverse wavelength dispersion characteristic. Further, it may be formed of a polymer film having optical anisotropy of reverse wavelength dispersion characteristics.

Liquid crystal compounds are usually positively dispersible in wavelength or often do not have wavelength dispersibility. In order to exhibit the dedispersion characteristic, if the absorption wavelength in the normal light direction can be made longer, a molecule satisfying the dedispersion characteristic can be designed.

The direction of normal light is, for example, the width direction of a molecule in a rod-shaped liquid crystal, and it is very difficult to lengthen the absorption transition wavelength in the width direction of such a molecule. In order to lengthen the absorption transition, it is usually possible to achieve it by expanding the pi-conjugated system, but if such a method is used, the width of the molecule will be expanded and the liquid crystallinity will be improved. This is because it disappears. In order to prevent such a decrease in liquid crystallinity, William N. A skeleton in which two rod-shaped liquid crystals reported by Turms et al. (Liquid Crystals, Vol. 25, p. 149, 1998) are connected laterally can be used.

Examples of the liquid crystal compound having such reverse dispersibility include JP-A-2010-522892, JP-A-2006-243470, JP-A-2007-243470, JP-A-2009-75494, and JP-A-2009. Examples of liquid crystal compounds described in JP-A-62508, JP-A-2009-179563, JP-A-2009-242717, JP-A-2009-242718, Patent No. 42223360, Patent No. 4186981 and the like are exemplified. it can.
In the present disclosure, it is particularly preferable to use a polymerizable liquid crystal material having a polymerizable functional group, which is described in, for example, Japanese Patent No. 6473537, Japanese Patent No. 5822098, Japanese Patent No. 5867655, Japanese Patent No. 5084293, and the like. A liquid crystal compound can be exemplified. This is because the polymerizable liquid crystal materials can be polymerized with each other via the polymerizable functional group, so that the mechanical strength of the retardation layer can be improved.

The liquid crystal material as described above may be used alone or in combination of two or more. When two or more kinds of liquid crystal materials are mixed and used in the present disclosure, a polymerizable liquid crystal material and a liquid crystal material having no polymerizable functional group may be mixed and used.

In the present disclosure, it is preferable that at least one of the retardation layers in the two optical functional members, particularly the retardation layer of the optical functional member located on the side opposite to the observer side, contains the liquid crystal material. Further, it is preferable that both of the retardation layers in the two optical functional members contain a liquid crystal material. This is because the optical compensation state can be improved.

Further, the retardation layer containing the liquid crystal material can be formed by applying the liquid crystal composition, or can be formed by laminating a cured film obtained by curing the liquid crystal composition. A coating type liquid crystal material is preferable because the retardation layer can be thinned. The thickness of the retardation layer is not particularly limited, but the thickness of the retardation layer in the optical functional member arranged on the observer side (outside) can be 1 to 100 μm, sandwiching the color film member. The thickness of the retardation layer in the optical functional member arranged on the inside side, which is the opposite side, can be 1 to 10 μm.

Examples of the transparent polymer film material having the optical anisotropy of the inverse dispersion characteristics include various stretched films such as polycarbonate and film materials disclosed in JP-A-2007-171756 and JP-A-2010-230832. The material can be applied. This is because it is excellent in optical characteristics and mechanical strength. Further, as a specific example of a commercially available film of a transparent polymer film material having an optical anisotropy of inverse dispersion characteristics, a trade name "Pure Ace WR" manufactured by Teijin Co., Ltd. ((phase difference value of 450 nm / 550 nm) Phase difference value) = 0.83).

The retardation layer is a member that transmits light emitted from a backlight portion when the color filter substrate of the present disclosure is used in, for example, a liquid crystal display device. Therefore, the retardation layer in the present disclosure preferably has a predetermined transparency. Here, "transparent" means that it is transparent enough to transmit the light emitted from the backlight unless otherwise specified. Since the specific transmittance of the retardation layer can be the same as that of the retardation layer used for a general optical functional member, the description thereof is omitted here.

(2) Fixed layer In the present disclosure, both of the above two optical functional members are a laminated body of the fixed layer and the retardation layer directly arranged on the color filter member, and the fixed layer is an alignment layer or an alignment layer. It is preferably an adhesive layer. Since the optical axes, thicknesses, etc. of the retardation layers of the two optical functional members arranged on both sides of the color filter member can be matched with high accuracy, the optical compensation state of the two optical functional members can be improved. Because. Further, from the viewpoint of matching the optical axis, thickness and the like of the retardation layers of the two optical functional members with higher accuracy, it is preferable that both the optical functional members are a laminated body of the alignment layer and the retardation layer. Since the alignment layer and the retardation layer can be formed directly on the color filter member by the coating method, the optical axes of the two retardation layers can be aligned with high accuracy. Here, "the fixed layer is directly arranged on the color filter member" means that the fixed layer and the layer constituting the color filter member are arranged in direct contact with each other. “The fixed layer is directly arranged on the color filter member” typically means that the fixed layer and the transparent base material layer in the color filter member are arranged in direct contact with each other. Further, it means that the fixed layer and the outermost layer on the colored layer side of the color filter member are arranged in direct contact with each other. Examples of the fixed layer include an alignment layer and an adhesive layer.

(I) Orientation layer In the present disclosure, it is preferable that the optical functional member is a laminate of an alignment layer directly arranged on the surface of the color filter member and a retardation layer. In particular, when the retardation layer contains a liquid crystal material, it is preferable that the optical functional member is a laminate of an alignment layer directly arranged on the surface of the color filter member and the retardation layer. In this case, the retardation layer is usually arranged directly on the surface of the alignment layer opposite to the color filter member side. When the optical functional member is a laminate of an alignment layer and a retardation layer, for example, the optical functional member can be arranged by forming the alignment layer directly on the color filter member and applying a liquid crystal material to the alignment layer. Therefore, the orientation direction of the retardation layer arranged on each surface of the color filter member can be arranged with high accuracy. Further, it is preferable that both of the two optical functional members are a laminate of an alignment layer directly arranged on the surface of the color filter member and a retardation layer containing a liquid crystal material. Since the film thickness profile (in-plane distribution) of the retardation layer can be formed so as to match on the front and back sides, for example, even if the phase difference value of the retardation layer deviates from the set value due to the tolerance of the device, it is public. This is because the effect of canceling the phase difference of the difference on the front and back can be exhibited. Specifically, even if there is a difference in the coating amount derived from each slit nozzle and a difference in the coating amount due to each slit coater, the thicknesses of the retardation layers arranged on the front and back sides can be matched at each location. The above effect can be exhibited.

The alignment layer may be a member containing the photoalignment material, although it is sufficient if the interaction for arranging the liquid crystal materials described above can be exhibited.

Here, the "photo-alignment material" contained in the alignment layer refers to a material capable of exhibiting an orientation-regulating force by the photo-alignment method. Further, the "photo-alignment method" is a method of expressing the orientation-regulating force (anisotropic) of the alignment layer by irradiating the alignment layer with light (polarized light) having an arbitrary polarization state. Therefore, the photo-alignment material in the present disclosure can be said to be a material capable of exhibiting an orientation-regulating force by irradiating with polarized light. Further, the "orientation regulating force" means an interaction of arranging the liquid crystal materials contained in the retardation layer.

The thickness of the alignment layer in the present disclosure can be adjusted according to the constituent materials. The thickness of the alignment layer in the present disclosure is, for example, preferably 0.01 μm or more and 2.0 μm or less, particularly preferably 0.02 μm or more and 1.0 μm or less, and particularly 0.03 μm or more and 0.2 μm or less. It is preferable to have. When the thickness of the alignment layer in the present disclosure is within the above range, a desired orientation regulating force can be exhibited with respect to the liquid crystal material contained in the retardation layer. The thickness of the alignment layer in the present disclosure can be measured, for example, by observing the cross section using a scanning electron microscope (SEM).

The alignment layer is a member that transmits the light emitted from the backlight when the color filter substrate of the present disclosure is used in a liquid crystal display device. Therefore, the orientation layer in the present disclosure preferably has a predetermined transparency. Here, "transparent" means that the light is transparent enough to transmit the light emitted from the backlight portion unless otherwise specified. Since the specific transmittance of the alignment layer can be the same as that of the alignment layer used for a general optical functional member, the description thereof is omitted here.

The alignment material contained in the alignment layer is not particularly limited as long as it is a material capable of exhibiting an orientation regulating force by irradiating with polarized light. Such photo-alignment materials include a photoisomerization material that changes only the molecular shape by a cis-trans change to reversibly change the orientation-regulating force, and a photoreaction material that changes the molecule itself by irradiating polarized light. It can be roughly divided into. In the present disclosure, either a photoisomerizing material or a photoreactive material can be preferably used, but it is more preferable to use a photoreactive material. In the photoreactive material, molecules react with each other when irradiated with polarized light to exert an orientation-regulating force, so that the orientation-regulating force can be irreversibly expressed. Therefore, the photoreactive material is superior in terms of orientation regulating force because it is stable over time.

Photoreactive materials can be further sorted according to the type of reaction produced by polarized irradiation. Specifically, a photodimerization type material that exerts an orientation regulating force by causing a photodimerization reaction, a photobonding type material that expresses an orientation regulating force by causing a photodecomposition reaction, and a photolysis reaction and a photobonding reaction. It can be divided into photodegradable-bonded materials and the like that exhibit orientation-regulating power. In the present disclosure, any of the above-mentioned photoreactive materials can be preferably used, but it is preferable to use a photodimerization type material from the viewpoint of stability and reactivity (sensitivity).

The photodimerization type material is not particularly limited as long as it is a material capable of exhibiting an orientation regulating force by causing a photodimerization reaction. In the present disclosure, the wavelength of the light that causes the photodimerization reaction is preferably 280 nm or more, particularly preferably 280 nm or more and 400 nm or less, and further preferably 300 nm or more and 380 nm or less.

Examples of such photodimerization type materials include polymers having cinnamate, coumarin, benzylidenephthalimidine, benzylideneacetophenone, diphenylacetylene, stillbazole, uracil, quinolinone, maleimido, and cinnamylidene acetate derivatives. In the present disclosure, among them, a polymer having at least one of cinnamate and coumarin, and a polymer having cinnamate and coumarin are preferably used. Specific examples of such a photodimerized material include compounds described in JP-A-9-118717, JP-A-10-506420, and JP-A-2003-505561.

The photo-alignment material used in the present disclosure may be of only one type or of two or more types. Further, the photoalignment material used in the present disclosure preferably has high heat resistance.

(Ii) Adhesive Layer In the present disclosure, it is preferable that the optical functional member is a laminate of an adhesive layer directly arranged on the surface of the color filter member and a retardation layer. In this case, the retardation layer is usually arranged directly on the surface of the adhesive layer opposite to the color filter member side. At this time, since the optical functional member can be formed by using the transfer method, the manufacturing cost of the color filter substrate can be reduced. Further, for example, when the color filter substrate is manufactured on multiple surfaces, the optical axes of the two optical functional members can be accurately aligned and arranged.

The adhesive layer is not particularly limited as long as the retardation layer and the color filter member can be adhered to each other, but an ultraviolet curable adhesive layer is preferable. In the ultraviolet curable adhesive layer, the thickness of the adhesive layer can be reduced, so that the thickness of the color filter substrate can be reduced. Further, by reducing the distance between the color filter member and the optical functional member, the light from the backlight can be advanced more efficiently.

The ultraviolet curable adhesive layer in the present disclosure refers to a member that is cured by irradiation with ultraviolet rays and exhibits adhesiveness. In addition, the ultraviolet curable adhesive layer usually has a predetermined adhesiveness before being irradiated with ultraviolet rays. Here, the predetermined adhesiveness is, for example, preferably that the peel strength of the ultraviolet curable adhesive layer on the glass plate by the 180 degree peel test specified in JIS K6854-2 is 10 N / 25 mm width or more, and above all, The width is preferably 15 N / 25 mm or more, and particularly preferably 20 N / 25 mm width or more. Further, in the present disclosure, the peel strength of the ultraviolet curable adhesive layer is preferably, for example, 50 N / 25 mm width or less, particularly preferably 45 N / 25 mm width or less, and particularly 40 N / 25 mm width or less. Is preferable.

The thickness of the ultraviolet curable adhesive layer in the present disclosure is, for example, preferably 10 μm or less, particularly preferably 5 μm or less, and particularly preferably 2 μm or less. Further, the thickness of the ultraviolet curable adhesive layer in the present disclosure is preferably 0.1 μm or more, for example. The thickness of the ultraviolet curable adhesive layer in the present disclosure can be measured by observing the cross section using, for example, a scanning electron microscope (SEM).

The ultraviolet curable adhesive layer in the present disclosure is a member that transmits light emitted from a backlight portion when the color filter substrate of the present disclosure is used in a liquid crystal display device. Therefore, the UV curable adhesive layer in the present disclosure preferably has a predetermined transparency. Here, "transparent" means that the light is transparent enough to transmit the light emitted from the backlight portion unless otherwise specified. For example, the total light transmittance of the ultraviolet curable adhesive layer can be the same as that of the adhesive layer used for a general optical functional member.

The ultraviolet curable adhesive layer in the present disclosure may be a layer made of an ultraviolet curable resin and cured by irradiation with ultraviolet rays. The ultraviolet curable resin used for the ultraviolet curable adhesive layer is not particularly limited as long as it is a material that can be cured by irradiating, for example, ultraviolet rays having a wavelength of 100 nm or more and 450 nm or less. For example, monofunctional monomers such as reactive ethyl (meth) acrylates, ethylhexyl (meth) acrylates, styrenes, methylstyrenes, N-vinylpyrrolidones, polyfunctional monomers, polymethylol propanetri (meth) acrylates, hexanediol (meth) acrylates. , Triethylene (polypropylene) glycol (meth) diacrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, Examples thereof include isocyanuric acid EO-modified diacrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, bisphenol fluorene derivative, bisphenoxyethanol full orange (meth) acrylate, and bisphenol full orange epokiki (meth) acrylate. .. Here, (meth) acrylate is a notation meaning acrylate or methacrylate. In the present disclosure, only one type of these ultraviolet curable resins may be used, or two or more types may be mixed and used. When the retardation layer is a resin film, a general adhesive material (Optical Clear Adaptive, so-called OCA) for optical applications can also be used.

(3) Arrangement of Optical Functional Members The arrangement of the two optical functional members will be described with reference to the drawings. 4 (a) to 4 (c) are explanatory views illustrating the arrangement of the two optical functional members in the present disclosure. In the present disclosure, as shown in FIG. 4A, the two optical functional members 1A and 1B have, for example, an optical compensation state in which the phase differences of the retardation layers cancel each other out (cancel each other). Be placed. More specifically, the two optical functional members 1A and 1B are arranged so that the optical axes x1 and x2 of the retardation layer are orthogonal to each other. The optical compensation state will be described with reference to a specific example in the case where the linearly polarized Lline (0) is incident on the two optical functional members 1A and 1B from the one optical functional member 1A side in FIG. 4A. First, when the linearly polarized Lline (0) is incident on the optical functional member 1A, a phase difference of −λ / 4 occurs in the vibration direction of the linearly polarized Lline (0) in the optical axis direction of the optical functional member 1A. As a result, the linearly polarized Lline (0) is converted into the circularly polarized Lc. Next, when the circularly polarized Lc is incident on the optical functional member 1B, a phase difference of −λ / 4 occurs in the vibration direction of the circularly polarized light Lc in the optical axis direction of the optical functional member 1B. As a result, the circularly polarized Lc is again converted into the linearly polarized Lline (0) which is the polarization direction Dline (0). As described above, the two optical functional members 1A and 1B do not work effectively with respect to the linearly polarized Lline (0) because the phase differences cancel each other out. Therefore, as shown in FIG. 4 (b), when two optical functional members 1A and 1B are arranged between the two linear polarizing plates 40A and 40B, as shown in FIG. 4 (c), two The linearly polarized Lline (0) can be advanced as in the case where the two optical functional members are not arranged between the linear polarizing plates 40A and 40B. For example, when the polarization directions of the linear polarizing plates 40A and 40B are orthogonal to each other, the linearly polarized Lline (0) is absorbed by the linear polarizing plate 40B. In FIG. 4C, for ease of explanation, two nonexistent optical functional members are shown by broken lines.

2. 2. Color filter member The color filter member in the present disclosure is a member arranged between the two optical functional members described above. The color filter member in the present disclosure usually includes at least a transparent base material layer and a colored layer.

(1) Transparent base material layer The transparent base material layer in the present disclosure is a member that supports a colored layer described later.

Here, the term "transparent" means transparency to the extent that the observer of the liquid crystal display device using the color filter substrate of the present disclosure does not interfere with the visual recognition from the observation surface, unless otherwise specified. Therefore, "transparency" includes colorless transparency and colored transparency to the extent that it does not interfere with visibility, and is not defined by a strict transmittance, and the degree of transparency is determined according to the application of the color filter substrate of the present disclosure. Can be decided.

The thickness of the transparent base material layer in the present disclosure is not particularly limited as long as it can support each member, and can be appropriately designed according to the application of the color filter substrate of the present disclosure. Since the specific thickness of the transparent base material layer can be the same as the thickness of the transparent base material layer used for a general color filter substrate, the description here is omitted.

The material of the transparent base material layer in the present disclosure is not particularly limited as long as it is a material used for a general color filter substrate, but it is preferably heat resistant. Examples of the transparent base material layer include a non-flexible inorganic substrate such as quartz glass, Pyrex (registered trademark) glass, and a synthetic stone plate, and flexibility such as a transparent resin film and an optical resin plate. Examples include a resin substrate. Above all, it is preferable to use an inorganic substrate, and among the inorganic substrates, it is preferable to use a glass substrate. Furthermore, it is preferable to use a non-alkali type glass substrate among the glass substrates. The non-alkali type glass substrate is excellent in dimensional stability and workability in high temperature heat treatment, and does not contain an alkali component in the glass, so that it is suitable for, for example, a color filter substrate used in a liquid crystal display device. Is.

(2) Colored layer The colored layer in the present disclosure is a layer arranged at an opening in the above-mentioned light-shielding portion.

The thickness of the colored layer in the present disclosure can be the same as the thickness of the colored layer used in a general color filter, and can be set to, for example, 1 μm or more and 5 μm or less.

In the present disclosure, it has, for example, three colored layers of red, green, and blue. The color of the coloring layer may include at least three colors of red, green, and blue. For example, three colors of red, green, and blue, four colors of red, green, blue, and yellow, or red, Five colors such as green, blue, yellow, and cyan can be used.

As the coloring layer, for example, a color material dispersed in a binder resin can be used. Examples of the coloring material used for the coloring layer include pigments and dyes of each color. For example, examples of the coloring material used for the red coloring portion include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthracene pigments, anthracene pigments, isoindoline pigments and the like. Examples of the coloring material used for the green coloring layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolines. Examples include linone pigments. Further, examples of the coloring material used for the blue coloring layer include copper phthalocyanine pigments, anthraquinone pigments, indanthrone pigments, indanthrone pigments, cyanine pigments, dioxazine pigments and the like. These pigments and dyes may be used alone or in combination of two or more. Examples of the binder resin used for the colored layer include photosensitive resins having a reactive vinyl group such as acrylate-based, methacrylate-based, polyvinyl cinnamic acid-based, and cyclized rubber-based.

In addition to the above-mentioned materials, the colored layer may contain, if necessary, a photopolymerization initiator, a sensitizer, a coatability improver, a development improver, a cross-linking agent, a polymerization inhibitor, a plasticizer, a flame retardant, etc. Can be contained.

Further, on the same plane on which the colored layer is formed, a white layer which does not contain the above-mentioned coloring material but contains a binder resin may be formed.

(3) Light-shielding layer The color filter member in the present disclosure may further have a light-shielding layer. The light-shielding layer in the present disclosure is a member arranged on one surface of a transparent base material and having a plurality of openings. The light-shielding layer is arranged in a region that overlaps the boundary region of the colored layer in a plan view. Further, the light-shielding layer is arranged, for example, on the surface of the transparent substrate on the colored layer side. In the color filter member, it is preferable that the transparent base material layer, the light-shielding layer, and the colored layer are laminated in this order.

The light-shielding layers are arranged in parallel so as to extend in a first direction and a second direction intersecting the first direction, defining an opening. Examples of the shape of the opening include a rectangular shape. Further, since the width of the opening in the light-shielding layer can be the same as the width of the opening in the light-shielding layer in a general color filter substrate, the description here is omitted.

The line width of the light-shielding layer in the present disclosure can be appropriately selected depending on the use of the color filter substrate of the present disclosure, and is not particularly limited, but is preferably 1 μm or more and 30 μm or less, and among them, 1. It is preferably 5 μm or more and 28 μm or less, particularly preferably 2 μm or more and 25 μm or less. If the line width of the light-shielding layer is smaller than the above range, the opening may not be sufficiently defined. Further, when the line width of the light-shielding layer is larger than the above range, a high-definition color filter may not be obtained. When the line width of the light-shielding layer is not constant, it is preferable that the line width of the light-shielding layer is all within the above range.

The thickness of the light-shielding layer in the present disclosure is not particularly limited as long as it can exhibit a desired light-shielding property, and is appropriately adjusted according to the material used for the light-shielding layer. The specific thickness of the light-shielding layer in the present disclosure can be, for example, 0.5 μm or more and 3.0 μm or less.

The constituent material of the light-shielding layer in the present disclosure is not particularly limited as long as it is a material capable of exhibiting a desired light-shielding property. Specifically, the light-shielding layer is usually a cured product containing a black color material in a binder resin, but may contain a colored material in addition to the black color material, if necessary. Since the constituent material of the light-shielding layer can be the same as the material used for a general color filter substrate, the description here is omitted.

(4) Protective layer The color filter member in the present disclosure may further have a protective layer. The protective layer is a layer arranged on the surface of the transparent base material layer on the colored layer side. Further, the protective layer is preferably arranged so as to cover the colored layer and the light-shielding layer. The material of the protective layer can be the same as the material of the protective layer in a general color filter substrate. For example, a photocurable resin such as a photosensitive polyimide resin, an epoxy resin and an acrylic resin, or a thermosetting resin, And inorganic materials and the like. In addition, examples of other materials include polymerization initiators and various additives. The thickness of the protective layer can be appropriately selected depending on the use of the color filter substrate.

3. 3. Other Configurations The color filter substrate of the present disclosure may have the above-mentioned optical functional member and the color filter member, and a necessary configuration can be appropriately selected and added. Other configurations include, for example, a touch panel, a linear polarizing plate, a front plate, and the like. Since these configurations can be the same as those used in a general liquid crystal display device, the description thereof is omitted here.

B. Liquid crystal display device The liquid crystal display device of the present disclosure is a liquid crystal layer arranged between the color filter substrate described in "A. Color filter substrate" described above, a counter substrate, the color filter substrate, and the counter substrate. At least a liquid crystal panel having As an example of the liquid crystal display device of the present disclosure, the liquid crystal display device 100 shown in FIG. 2 described in the above-mentioned "A. Color filter substrate" can be mentioned.

According to the present disclosure, since the liquid crystal panel has the color filter substrate described above, it is possible to obtain a liquid crystal display device that suppresses external light reflection inside the liquid crystal display device and exhibits good contrast.

The color filter substrate used for the liquid crystal panel in the liquid crystal display device of the present disclosure can be the same as the content described in the above-mentioned section “A. Color filter substrate”, and thus the description thereof is omitted here. Further, the facing substrate and the liquid crystal layer in the present disclosure can be the same as those used in a general liquid crystal display device, and thus the description thereof is omitted here.

The liquid crystal display device can be added by appropriately selecting a necessary configuration other than the liquid crystal panel described above. For example, as shown in FIG. 2, the liquid crystal display device 100 of the present disclosure has two optical functional members 1A and 1B, the color filter member 2 and two 40A and 40B so as to sandwich the liquid crystal layer 30. In this case, the two linear polarizing plates 40A and 40B are arranged so that the polarization directions are orthogonal to each other, and the retardation layers in the two optical functional members 1A and 1B have the optical axes of the retardation layers. Arranged so as to be orthogonal to each other, the angle formed by the optical axis of the linear polarizing plate 40A and the optical axis of the retardation layer in the optical functional member 1A, the optical axis of the linear polarizing plate 40B and the optical axis of the retardation layer in the optical functional member 1B. The angle formed by the light crystal is preferably 45 °.
Other configurations include, for example, a backlight, a front plate, and the like.

The liquid crystal display device of the present disclosure can be applied to, for example, a television, a personal computer, a smartphone, a tablet terminal, or the like.

C. Others The color filter substrate of the present disclosure can be manufactured, for example, as follows. 8 (a) to 8 (d) are process diagrams showing an example of a method for manufacturing a color filter substrate. First, as shown in FIG. 8A, the photoalignment material 12a is directly coated on one surface of the color filter member using the coating machine P, and then polarized light is exposed to be subjected to polarization exposure in FIG. 8B. ) May be formed. Further, the retardation layer 11 may be formed as shown in FIG. 8C by irradiating the alignment layer 12 with a liquid crystal material and then irradiating it with ultraviolet rays. Further, as shown in FIG. 8D, the alignment layer 12 and the retardation layer 11 may be formed on the other surface of the color filter member 2 in the same manner. Next, although not shown, the color filter substrate may be annealed.

Further, when the color filter substrate of the present disclosure has a bonded type retardation layer, the color filter substrate can be manufactured by the methods of FIGS. 9A to 9C. For example, as shown in FIG. 9A, a transfer substrate having the transfer substrate layer 200 and the retardation layer 11 is prepared and attached to one surface side of the color filter member 2 via the adhesive layer 13. After the combination, the transfer substrate layer 200 may be peeled off as shown in FIG. 9B. That is, the retardation layer 11 may be formed by a transfer method. Further, as shown in FIG. 9C, the adhesive layer 13 and the retardation layer 11 may be formed on the other surface of the color filter member 2 in the same manner. Although not shown, an optical function member having an alignment layer and a retardation layer is arranged on one surface side of the color filter member, and an adhesive layer and a retardation layer are provided on the other surface side of the color filter member. Members may be arranged.

Further, whether the retardation layer is a coating type or a bonding type can be determined depending on the configuration and application of the color filter substrate. Further, in the color filter substrate, the retardation layer of one optical functional member may be a coating type, and the retardation layer of the other optical functional member may be a bonding type. In this case, it is preferable that the retardation layer of the optical functional member on the observer side is a bonded type and the retardation layer of the optical functional member on the other inside side is a coating type.

The present disclosure is not limited to the above embodiment. The above-described embodiment is an example, and any object having substantially the same structure as the technical idea described in the claims of the present disclosure and exhibiting the same action and effect is described in this invention. Included in the technical scope of disclosure.

Examples and comparative examples are shown below, and the present disclosure will be described in more detail.

[Example]
(Preparation of copolymer resin solution)
63 parts by mass of methyl methacrylate (MMA), 12 parts by mass of acrylic acid (AA), 6 parts by mass of -2-hydroxyethyl methacrylate (HEMA), and 88 parts by mass of diethylene glycol dimethyl ether (DMDG) were charged in the polymerization tank. After stirring and dissolving, 7 parts by mass of 2,2'-azobis (2-methylbutyronitrile) was added and dissolved uniformly. Then, the mixture was stirred at 85 ° C. for 2 hours under a nitrogen stream, and further reacted at 100 ° C. for 1 hour. To the obtained solution, 7 parts by mass of glycidyl methacrylate (GMA), 0.4 parts by mass of triethylamine, and 0.2 parts by mass of hydroquinone were further added, and the mixture was stirred at 100 ° C. for 5 hours to obtain a copolymer resin solution ( Solid content 50%) was obtained.

(Synthesis of curable resin composition)
The following materials were stirred and mixed at room temperature to obtain a curable resin composition.
<Composition of curable resin composition>
-The above copolymer resin solution (solid content 50%) ... 16 parts by mass-Dipentaerythritol pentaacrylate (trade name: SR399, manufactured by Sartmer) ... 24 parts by mass-Orthocresol novolac type epoxy resin (trade name: Epicoat 180S70, (Manufactured by Yuka Shell Epoxy): 4 parts by mass: 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropane-1-one (trade name: Irgacure 907, manufactured by Ciba Specialty Chemicals) … 4 parts by mass ・ Diethylene glycol dimethyl ether (manufactured by Genuine Chemical Co., Ltd.)… 52 parts by mass

(Preparation of composition for light-shielding layer)
First, the following amounts of components were mixed and sufficiently dispersed with a sand mill to prepare a black pigment dispersion.
<Composition of black pigment dispersion>
・ Black pigment: 23 parts by mass ・ Polymer dispersant (Big Chemie Japan Co., Ltd. Disperbyk111): 2 parts by mass ・ Solvent (diethylene glycol dimethyl ether): 75 parts by mass

Next, the following amounts of the components were sufficiently mixed to obtain a composition for a light-shielding layer.
<Composition of composition for light-shielding layer>
-The black pigment dispersion ... 61 parts by mass-The curable resin composition ... 20 parts by mass-Diethylene glycol dimethyl ether ... 30 parts by mass

(Preparation of composition for colored layer)
For each of the red, green, and blue colored layer compositions, the pigment and the dispersant were first mixed in the following amounts and sufficiently dispersed by a sand mill to prepare a colored pigment dispersion liquid. Next, the colored pigment dispersion liquid, the curable resin composition, and the solvent were mixed in their respective amounts to obtain a colored layer forming composition.

<Composition of composition for red colored layer>
・ C. I. Pigment Red 254 ... 7 parts by mass-Polysulfonic acid type polymer dispersant ... 3 parts by mass-The curable resin composition ... 23 parts by mass-Acetic acid-3-methoxybutyl ... 67 parts by mass

<Composition of composition for green colored layer>
・ C. I. Pigment Green 58 ... 7 parts by mass · C.I. I. Pigment Yellow 138 ... 1 part by mass-Polysulfonic acid type polymer dispersant ... 3 parts by mass-The curable resin composition ... 22 parts by mass-Acetic acid-3-methoxybutyl ... 67 parts by mass

<Composition of composition for blue colored layer>
・ C. I. Pigment Blue 1 ... 5 parts by mass-Polysulfonic acid type polymer dispersant ... 3 parts by mass-The curable resin composition ... 25 parts by mass-Acetic acid-3-methoxybutyl ... 67 parts by mass

(Manufacturing of color filter members)
A color filter member was produced by the following procedure.

(Formation of light-shielding layer)
As a transparent base material, a glass substrate with a thickness of 0.7 mm (Asahi Glass Co., Ltd. AN material) was prepared. The above composition for a light-shielding layer was applied onto a transparent substrate with a spin coater and dried at 100 ° C. for 3 minutes to form a light-shielding layer having a thickness of about 1 μm. The light-shielding layer is exposed to a light-shielding pattern (striped RGB repetition of 75 μm pitch) with an ultra-high pressure mercury lamp, developed with a 0.05 wt% potassium hydroxide aqueous solution, and then the substrate is placed in an atmosphere of 230 ° C. By leaving it for 30 minutes, heat treatment was performed to form a light-shielding layer having a plurality of openings.

(Formation of red colored layer)
The transparent substrate on which the light-shielding layer is formed as described above is irradiated with a low-pressure mercury UV lamp from the light-shielding layer forming side to form a first region, and then the above-mentioned composition for a red colored layer is subjected to a spin coating method. The first region was coated (coating thickness 2.0 μm), and then dried in an oven at 70 ° C. for 3 minutes. Next, a photomask is placed at a distance of 100 μm from the coating film of the composition for the red colored layer, and ultraviolet rays are applied only to the region corresponding to the region where the colored portion is formed by using a 2.0 kW ultra-high pressure mercury lamp with a proximity liner. Irradiation was performed for 10 seconds. Then, it was immersed in a 0.05 wt% potassium hydroxide aqueous solution (liquid temperature 23 ° C.) for 1 minute and subjected to alkaline development to remove only the uncured portion of the coating film of the composition for the red colored layer. Then, the substrate was left to stand in an atmosphere of 230 ° C. for 25 minutes to perform heat treatment to form a red relief pattern (red colored layer) at the opening of the light-shielding layer.

(Formation of green colored layer)
Next, the second region is formed in the same manner as the above-mentioned light irradiation step, and the green colored layer composition having the above-mentioned composition is used to form the second region in the same step as the red relief pattern formation. A relief pattern (green colored layer) was formed.

(Formation of blue colored layer)
Further, a third region is formed in the same manner as the above-mentioned light irradiation step, and the blue relief pattern is formed in the third region by the same step as the red relief pattern formation using the composition for the blue colored layer having the above-mentioned composition. (Blue colored layer) was formed.

(Formation of protective layer)
Then, the above-mentioned curable resin composition was applied as a protective layer by a spin coating method and dried to form a coating film (coating thickness 2.0 μm). A photomask was placed at a distance of 100 μm from the coating film of the curable resin composition, and ultraviolet rays were irradiated only to the formed region of the protective film for 10 seconds using a 2.0 kW ultrahigh pressure mercury lamp with a proximity liner. Then, it was immersed in a 0.05 wt% potassium hydroxide aqueous solution (liquid temperature 23 ° C.) for 1 minute and subjected to alkaline development to remove only the uncured portion of the coating film of the curable resin composition. After that, the substrate was left in an atmosphere of 230 ° C. for 30 minutes to be heat-treated to form a protective layer, which was used as a color filter member.

(Manufacturing of the first optical functional member)
By the following procedure, a first optical functional member in which an alignment layer and a retardation layer were laminated in this order on the above-mentioned protective layer was produced.

(Formation of alignment layer)
The alignment layer is coated with a photoalignment film material (solid content 4.5%) manufactured by JSR Corporation so as to have a film thickness of 0.2 μm, dried at 120 ° C. for 1 minute, and then 30 mJ with a polarization exposure apparatus. It was prepared by irradiating polarized ultraviolet rays of / cm ² . The angle of the polarizing exposure device was adjusted so that the angle formed by the optical axis of the polarizing plate installed on the liquid crystal panel and the optical axis of the retardation layer was 45 degrees.

(Formation of retardation layer)
A polymerized liquid crystal having a reverse wavelength dispersibility was applied to the retardation layer. Specifically, a polymerizable liquid crystal having a reverse wavelength dispersibility property having a wavelength dispersibility of 0.86 was prepared with reference to Japanese Patent No. 6473537. The above solution was applied with a spin coater, dried at 90 ° C. for 1 minute, and then exposed at an exposure amount of 500 mJ / cm ² and an exposure wavelength of 365 nm to form a retardation layer. The front retardation Re (nm) is affected by the process performed after the retardation layer is formed, especially after all the steps are completed, so that it becomes λ / 4 at a wavelength of 550 nm after the retardation layer is formed. The front phase difference value was adjusted. Specifically, the amount of change in the phase difference after the formation of the retardation layer was measured in advance, and the front retardation value after the formation of the difference layer was set to a value in which the amount of change was expected.

(Formation of protective layer)
Then, the above-mentioned curable resin composition was applied as a protective layer by a spin coating method and dried to form a coating film (coating thickness 2.0 μm). The detailed conditions are the same as those of the color filter protective layer described above.

(Manufacturing of second optical functional member)
A second optical layer in which an alignment layer and a retardation layer are laminated in this order on a transparent substrate surface which is a surface opposite to the surface on which the first optical functional member of the color filter member is formed by the following procedure. A functional member was produced.

(Formation of alignment layer)
The alignment layer is coated with a photoalignment film material (solid content 4.5%) manufactured by JSR Corporation so as to have a film thickness of 0.2 μm, dried at 120 ° C. for 1 minute, and then 30 mJ with a polarization exposure apparatus. It was prepared by irradiating polarized ultraviolet rays of / cm ² . The angle of the polarization exposure apparatus was adjusted so that the angle formed by the optical axis of the retardation layer on the color filter surface side was 90 degrees.

(Formation of retardation layer)
A polymerized liquid crystal having a reverse wavelength dispersibility was applied to the retardation layer. Specifically, a polymerizable liquid crystal having a reverse wavelength dispersibility property having a wavelength dispersibility of 0.86 was prepared with reference to Japanese Patent No. 6473537. The above solution was applied with a spin coater, dried at 90 ° C. for 1 minute, and then exposed at an exposure amount of 500 mJ / cm ² and an exposure wavelength of 365 nm to form a retardation layer. The front retardation Re (nm) is affected by the process performed after the retardation layer is formed, especially after all the steps are completed, so that it becomes λ / 4 at a wavelength of 550 nm after the retardation layer is formed. The front phase difference value was adjusted. Specifically, the amount of change in the phase difference after the formation of the retardation layer was measured in advance, and the front retardation value after the formation of the difference layer was set to a value in which the amount of change was expected.

(Formation of protective layer)
Then, the above-mentioned curable resin composition was applied as a protective layer by a spin coating method and dried to form a coating film (coating thickness 2.0 μm). The detailed conditions are the same as those of the color filter protective layer described above. A color filter substrate was obtained by the above procedure.

[Comparison example]
Except for changing the material of the retardation layer used for the first optical functional member and the second optical functional member to a polymerizable liquid crystal having a positive wavelength dispersibility property having a wavelength dispersibility of 1.09. A color filter substrate having the same layer structure as the above-mentioned color filter with an optical functional member was produced. The polymerized liquid crystal material having a wavelength dispersibility of 1.09 was prepared with reference to JP-A-2017-138401.

[Evaluation]
(Manufacturing of liquid crystal panel for evaluation)
A columnar spacer (spacer-member) was formed on the surface of the obtained color filter substrate on the side of the first optical functional member by the following procedure. The above-mentioned curable resin composition was applied onto the light-shielding layer by a spin coating method and dried to form a coating film. A photomask was placed at a distance of 100 μm from the coating film of the curable resin composition, and only the region where the columnar spacer was formed was irradiated with ultraviolet rays for 10 seconds using a 2.0 kW ultrahigh pressure mercury lamp with a proximity liner. Then, it was immersed in a 0.05 wt% potassium hydroxide aqueous solution (liquid temperature 23 ° C.) for 1 minute and subjected to alkaline development to remove only the uncured portion of the coating film of the curable resin composition. After that, the substrate was left to stand in an atmosphere of 230 ° C. for 30 minutes to be heat-treated to form columnar spacers having a predetermined number density.

Next, a TFT substrate was prepared as a counter substrate. An alignment layer was formed on the color filter substrate on which the columnar spacer was formed and the TFT substrate in order to align the driving liquid crystal. After bonding the TFT substrate and the color filter substrate, the driving liquid crystal was injected between the color filter substrate and the TFT substrate, and the polarizing plates were bonded to the front and back of the panel in a cross-nicol relationship. The optical axis of the optical axis of the polarizing plate and the retardation layer of the color filter substrate was set to 45 degrees. A low-reflection film was attached to the outermost surface of the liquid crystal panel on the manside side. From the above, a liquid crystal panel for evaluation was obtained.

(Reflectance measurement)
The reflectance on the manside side of the produced liquid crystal panel was measured. As a measuring device, CM-2500d manufactured by Konica Minolta Co., Ltd. was used. In the layer structure of the example, the color difference ΔE * ab was 10.2, whereas in the layer structure of the comparative example, the color difference ΔE * ab was 72.8.

(Visual evaluation)
Further, when the produced liquid crystal panel was darkened and observed in an outdoor bright environment (about 20000 lux), the reflection color was purple in the configuration of the comparative example, whereas in the configuration of the example, it was observed. The color of the reflection was natural.

1 ... Optical functional member 11 ... Phase difference layer 12 ... Alignment layer 13 ... Adhesive layer 2 ... Color filter member 10 ... Color filter substrate 20 ... Opposing substrate 30 ... Liquid crystal layer 100A ... Liquid crystal panel 100 ... Liquid crystal display device

Claims (7)

A color filter substrate including two optical functional members and a color filter member provided between the two optical functional members.
Both of the two optical functional members have a retardation layer and
Each of the retardation layers is a color filter substrate having anti-wavelength dispersibility and functioning as a 1 / 4λ member that imparts a phase difference of 1/4 wavelength to transmitted light. The color filter substrate according to claim 1, wherein either or both of the retardation layers in the two optical functional members contain a liquid crystal material. Of the retardation layers in the two optical functional members, at least the retardation layer in the optical member on the side irradiated with external light has a retardation value Re (550) at a wavelength of 450 nm with respect to a retardation value Re (550) at a wavelength of 550 nm. The color filter substrate according to claim 1 or 2, wherein the value of the ratio Re (450) / Re (550) of 450) is 0.9 or less. The retardation layer in the two optical functional members according to any one of claims 1 to 3, wherein the difference in phase difference is within ± 5% at each wavelength of 450 nm, 550 nm, and 650 nm. The color filter substrate described. The color filter substrate further has a linear polarizing plate, and one of the retardation layers in the two optical functional members can be combined with the linear polarizing plate to generate incident light and internally reflected external light. The color filter substrate according to any one of claims 1 to 4, wherein the color difference ΔE * ab from the light is less than 20. A liquid crystal panel having at least the color filter substrate according to any one of claims 1 to 5, a facing substrate, and a liquid crystal layer arranged between the color filter substrate and the facing substrate. A liquid crystal display device provided. The liquid crystal display device includes the two optical functional members, the color filter member, and two linear polarizing plates so as to sandwich the liquid crystal layer, and the two linear polarizing plates are arranged so that the polarization directions are orthogonal to each other. The retardation layers in the two optical functional members are arranged so that the optical axes of the retardation layers are orthogonal to each other, and the angle formed by the optical axis of the linear polarizing plate and the optical axis of the retardation layer is 45. The liquid crystal display device according to claim 6, wherein °.