JP2003043216A - Scattering anisotropic film and liquid crystal display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen a visual range, to brighten a display picture by enhancing scattering properties (furthermore, reducing a yellowish tinge) and to observe in a state with reduced blurring in applying a scattering anisotropic film to a liquid crystal display device. SOLUTION: The scattering anisotropic film is provided with a plurality of regions with mutually different refractive indexes inside thereof and is constructed in such a way that the respective regions with the mutually different refractive indexes are distributed in layers along the film thickness direction or inclined thereto. When the refractive indexes of the respective regions with the mutually different refractive indexes are denoted by n1 and n2 (provided that n1 and n2 satisfy an inequality n1>n2) and the film thickness is denoted by T, the difference in the refractive indexes Δn(=|n1-n2|) and the film thickness T are made to satisfy an inequality 140 nm<|n1-n2|×T<325 nm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scattering anisotropic film used for a display device such as a reflective liquid crystal display device which changes a display pattern by modulating transmission / non-transmission of incident light according to an applied voltage. And a liquid crystal display device using the same, in particular, a reflection type liquid crystal display device can be observed in a state where the viewing area is widened, the scattering property is increased to make the display image brighter, the yellowishness is further reduced, and the blurring is reduced. The present invention relates to such a scattering anisotropic film and a liquid crystal display device using the same.

[0002]

2. Description of the Related Art Conventionally, in a reflective liquid crystal display device in which a display pattern is changed by modulating transmission / non-transmission of incident light according to an applied voltage, a viewing angle for observation is ensured (that is, On the front of the display device, make the displayed image look brighter while reducing the blurring of the image),
For the purpose of making the display image visible with uniform brightness over the entire display screen, the scattering property varies depending on the change of the incident angle of the incident light on the front side (viewer side) of the reflective liquid crystal panel. At the same time, a scattering anisotropic film having anisotropy in light scattering characteristics has been arranged.

As this type of scattering anisotropic film, those disclosed in, for example, "Japanese Patent Application Laid-Open No. 2000-171619" and "Japanese Patent Application Laid-Open No. 11-352470" have been used.

That is, this scattering anisotropic film basically has a structure in which inside the film, portions having different refractive indexes with respect to the thickness direction of the film are inclined and distributed in layers. Is.

[0005]

However, in such a scattering anisotropic film, the scattering property of the scattering anisotropic film is lower than that of the isotropic scattering film, and in the case of scattering. However, there is a problem that a bright display image cannot be obtained because there are many transmitted light components that are not scattered.

In addition, liquid crystals, polarizing plates and the like are generally colored in the yellow direction in many cases, and there is a problem that the displayed image looks yellow.

The object of the present invention, when applied to a liquid crystal display device, is to observe a display image with a wide viewing area and a high scattering property to make the displayed image brighter, further reduce the yellow tint and reduce the blur. An object is to provide a scattering anisotropic film that can be manufactured.

Further, an object of the present invention is to provide a liquid crystal display device capable of observing in a state in which the viewing area is widened, the scattering property is increased to make the displayed image brighter, the yellow tint is further reduced, and the blur is reduced. To provide.

[0009]

In order to achieve the above object, in the invention corresponding to claim 1, inside the film,
Scattering of a structure that has multiple regions with different refractive indices, and each region with different refractive index is distributed in layers along the thickness direction of the film or inclined with respect to the thickness direction of the film. It is an anisotropic film, and the respective refractive indexes in the respective regions having different refractive indexes are n1 and n2 (however,
When n1 and n2 are n1> n2) and the thickness of the film is T, the refractive index difference Δn (= | n1-n2)
|) And the thickness T of the film are

[Equation 3] I try to satisfy the relationship.

Therefore, in the scattering anisotropic film of the invention according to claim 1, the above-mentioned means are taken to widen the viewing range when applied to a liquid crystal display device,
It is possible to observe the displayed image in a state where the scattering property is increased and the displayed image is bright and the blur is reduced.

Further, in the invention corresponding to claim 2, there are a plurality of regions having different refractive indexes inside the film, and each region having a different refractive index is along the thickness direction of the film or the thickness of the film. It is a scattering anisotropic film having a structure in which it is distributed in a layered manner inclining with respect to the vertical direction, and the respective refractive indexes in respective regions having different refractive indexes are n1 and n2 (where n1 and n2 are, n1> n2) and the film thickness is T, the refractive index difference Δn (= | n
1-n2 |) and the thickness T of the film are

[Equation 4] I try to satisfy the relationship.

Therefore, in the scattering anisotropic film of the invention according to claim 2, by taking the above-mentioned means, it is possible to widen the viewing range when applied to a liquid crystal display device,
It is possible to observe with a high scattering property to make the displayed image brighter, to reduce the yellow tint, and to reduce the blur.

On the other hand, in the invention according to claim 3, in the scattering anisotropic film of the invention according to claim 1 or claim 2, when the refractive index difference Δn is 0.01, scattering is different. The thickness T of the main body of the anisotropic film is 140
The range is from 00 nm to 32500 nm.

Therefore, in the scattering anisotropic film of the invention corresponding to the third aspect, a higher scattering property can be obtained by taking the above means.

Further, in the invention according to claim 4, in the scattering anisotropic film of the invention according to claim 1 or 2, when the refractive index difference Δn is 0.01, the scattering difference is The thickness T of the main body of the anisotropic film is 140
The range is from 00 nm to 25000 nm.

Therefore, in the scattering anisotropic film of the invention according to claim 4, by taking the above-mentioned means, it is possible to obtain the scattering property in which the yellow tint is further reduced.

Further, in the invention according to claim 5, in the scattering anisotropic film of the invention according to claim 1 or claim 2, when the refractive index difference Δn is 0.02, scattering difference occurs. The thickness T of the main body of the anisotropic film is 700
The range is from 0 nm to 16250 nm.

Therefore, in the scattering anisotropic film of the invention according to claim 5, it is possible to obtain a higher scattering property by taking the above means.

Furthermore, in the invention corresponding to claim 6, in the scattering anisotropic film of the invention corresponding to claim 1 or claim 2, scattering occurs when the refractive index difference Δn is 0.02. As the thickness T of the anisotropic film body,
The range is from 7000 nm to 12500 nm.

Therefore, in the scattering anisotropic film of the invention according to claim 6, by taking the above-mentioned means, it is possible to obtain the scattering property in which the yellow tint is further reduced.

On the other hand, in the invention according to claim 7, a reflection type liquid crystal panel for changing a display pattern by modulating transmission / non-transmission of incident light according to an applied voltage, and a rear side of the reflection type liquid crystal panel ( Placed on the opposite side of the observer)
A reflection type liquid crystal display device, comprising: a reflection plate that reflects incident light modulated by the reflection type liquid crystal panel and emits the light to the reflection type liquid crystal panel side, the front side (viewer side) of the reflection type liquid crystal panel. In the above, the scattering anisotropic film of the invention corresponding to any one of claims 1 to 6 is arranged.

Therefore, in the liquid crystal display device of the invention according to claim 7, the scattering anisotropic film having the action of the invention according to any one of claims 1 to 4 is applied to the applied voltage. By arranging it on the front side (viewer side) of a reflective liquid crystal panel that changes the display pattern by modulating the transmission / non-transmission of incident light, the viewing range of the liquid crystal display device is increased and the scattering property is increased. Thus, the displayed image can be observed brightly (further yellowing is reduced) and the blurring can be reduced.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The scattering anisotropic film of the present invention comprises
Conditions for making a highly anisotropic scattering anisotropic film,
By focusing on the conditions for reducing the yellow tint of the film, which is a problem of the scattering anisotropic film,
When applied to a reflective liquid crystal display device, the viewing area can be expanded and the yellow tint can be reduced.

That is, the film has a plurality of regions having different refractive indices, and the regions having different refractive indices are layered along the thickness direction of the film or inclined with respect to the thickness direction of the film. In the scattering anisotropic film having a structure in which the refractive indices are n1 and n2 (where n1 and n2 are n1>
n2) and the film thickness is T, the refractive index difference Δn (= | n1-n2 |) and the film thickness T are

[Equation 5] Or

[Equation 6] To satisfy the relationship.

Embodiments of the present invention based on the above attention will be described in detail below with reference to the drawings.

(First Embodiment) FIG. 1 is a sectional view showing a structural example of an optical film according to the present embodiment.

That is, as shown in FIG. 1, the scattering anisotropic film 1 according to the present embodiment has a plurality of regions (2 having a high refractive index (layer) and 3 having a high refractive index) inside the film. Regions (layers) each having a low refractive index), and regions 2 and 3 having different refractive indices are inclined along the thickness direction of the film or respectively with respect to the thickness direction of the film. The film has a structure in which layers are distributed in layers, and the respective refractive indices in regions 2 and 3 having different refractive indices are n1 and n2 (however, n1 and n2 are
Is n1> n2), and when the film thickness is T, the refractive index difference Δn (= | n1-n2 |) and the film thickness T are

[Equation 7] I try to satisfy the relationship.

The scattering anisotropic film 1 according to the present embodiment is manufactured by a method disclosed in, for example, "Japanese Patent Laid-Open No. 2000-171619" or "Japanese Patent Laid-Open No. 11-352470". can do.

Next, in the scattering anisotropic film 1 according to the present embodiment configured as described above, when it is applied to a liquid crystal display device, the viewing area is reduced with respect to the incident light (illumination light) 4. It is possible to observe the displayed image with widening and high scattering to make the displayed image bright and with less blur.

That is, as shown in FIG. 1, the scattering anisotropic film 1 of the present embodiment has a difference in refractive index of 0.1.
A structure of about 1 μm to 100 μm is formed with directionality in the thickness direction of the film.

The scattering anisotropic film 1 has a high scattering property when illuminated with the light 4 having an incident angle θ along the thickness direction of the film, and the scattering property decreases as the distance from the angle θ increases.

The scattering of the scattering anisotropic film 1 is caused by the illumination light 4
Is transmitted through the film, it is caused by the phase difference between the light transmitted through the region 2 having a high refractive index and the light transmitted through the region 3 having a low refractive index, and the phase difference is the wavelength λ of the light 4. When it is equal to half, it scatters most strongly.

Therefore, the respective refractive indices in the regions 2 and 3 having different refractive indices of the scattering anisotropic film 1 are set to n1 and n2, the film thickness is T, and the incident angle of the illumination light 4 in the film is θ. Assuming that the wavelength of the illumination light 4 is λ, the light can be scattered most efficiently when | n1−n2 | × T / cos (θ) = λ / 2.

This is obtained from the principle of diffraction, and in the case of the phase type diffraction grating, the highest diffraction efficiency can be easily obtained when the phase difference is half the wavelength.

In the case of the reflection type liquid crystal panel, as the illumination light 4 to be used, sunlight or room illumination is used, so that light of various wavelengths and various angles are incident.

The wavelength λ of the light 4 used is 400 of visible light.
The light 4 has a wavelength of nm to 650 nm, and the incident angle θ of the light 4 is about 0 to 45 degrees.

Therefore, the refractive index difference Δn (= | n1-n2
|) And the thickness T of the film are

[Equation 8] It is good to satisfy the relationship of.

Here, the refractive index difference Δn (= | n1-n2
|) Is generally determined by the properties of the material.

For example, as an example of the photopolymerization photopolymer constituting the film, use is made of the photopolymer disclosed in, for example, "JP-A-2-3081" or "JP-A-2-3082". You can

Examples of the actual photopolymerizable photopolymer products include Omnidex series (disclosed in "JP-A-5-27436") manufactured by DuPont.

As for these photopolymerizable photopolymers, those having a refractive index difference Δn higher than 0.005 are 0.0
Some have been reported near four.

On an actual product, there are many cases where the product changes from 0.01 to 0.02.

The average refractive index of these materials is
It is about 1.4 to 1.7.

Here, assuming a scattering anisotropic film 1 made of a material having a refractive index difference Δn = 0.01, a high scattering property is obtained when the thickness T of the film is in the range of 14000 nm to 32500 nm. To be

In order to strongly scatter light of 500 nm, which has high visibility, the film thickness T is set to 25.
Nearly 000 nm is most suitable.

On the other hand, assuming a scattering anisotropic film 1 made of a material having a refractive index difference Δn = 0.02, a high scattering property is obtained when the film thickness T is in the range of 7000 nm to 16250 nm. .

Further, in order to strongly scatter light of 500 nm having high visibility, the film thickness T is set to 12
The vicinity of 500 nm is the most suitable.

Scattering anisotropic film 1 according to the present embodiment
Is a plurality of regions 2 and 3 having different refractive indexes inside the film.
However, the film has a structure in which the layers are distributed along the thickness direction of the film or inclined with respect to the thickness direction of the film.

This tilt angle and the illumination light 4 in the film
The illuminating light 4 exhibits strong scattering when the traveling directions of the two coincide with each other.

When the average refractive index of the photopolymer forming the film is N2 and the illumination light 4 is incident from the medium having the refractive index N1 at an angle φ, the light is refracted at the boundary with the film and the illumination light 4 in the film is changed. The incident angle θ can be obtained by Snell's law represented by the following well-known formula.

N1 · sin (φ) = N2 · sin (θ) For example, when light 4 having a wavelength of 500 nm is incident from the air having a refractive index N1 = 1 at an angle of φ = 25 degrees, the average refractive index is 1. In the film of No. 5, it advances with an angle of θ = about 16.4 degrees.

Assuming that the refractive index difference Δn of the photopolymers forming this film is 0.01, the highest value is obtained when the film thickness T = 23983 nm because of the relationship Δn × T / cos (θ) = λ / 2. It has a scattering property, and as a result, a film having a high scattering anisotropy can be obtained.

As described above, in the actual photopolymer,
A film thickness of about 3500 nm to 65000 nm is desirable, and a range of 7000 nm to 32500 nm is most desirable.

FIG. 2 is a cross-sectional view showing a structural example of a reflective liquid crystal display device using the scattering anisotropic film 1 according to this embodiment. Note that FIG. 2 shows a case where the illumination light 4 is obliquely incident on the scattering anisotropic film 1 and is observed from a substantially vertical direction. That is, as shown in FIG. 2, the reflection-type liquid crystal display device has an incident light 4 depending on the applied voltage.
A reflective liquid crystal panel 5 that changes the display pattern by modulating the transmission / non-transmission of light, and is arranged on the back side (the side opposite to the observer 6) of the reflective liquid crystal panel 5 and modulated by the reflective liquid crystal panel 5. A reflection plate 7 that reflects the incident light 4 that is emitted and emits the reflected light to the reflective liquid crystal panel 5 side, and the scattering anisotropic of the present embodiment, which is arranged on the front surface side (observer 6 side) of the reflective liquid crystal panel 5. It is composed of a transparent film 1. Therefore, by applying the scattering anisotropic film 1 of the present embodiment to a reflective liquid crystal display device, when the illumination light 4 passes through the film, the light transmitted through the region 2 having a high refractive index, The phase difference with the light transmitted through the region 3 having a low refractive index causes the scattering of the scattering anisotropic film 1, and when the phase difference becomes equal to half the wavelength λ of the light 4, the strongest scattering occurs. .

That is, in the scattering anisotropic film 1, the refractive index difference Δn (= | n1-n2 |) and the film thickness T are

[Equation 9] By satisfying the condition that
It is possible to realize a reflection type liquid crystal display device capable of observing a display image with a wide viewing area and a high scattering property to make the display image bright and reduce blur.

As described above, in the scattering anisotropic film 1 and the reflection type liquid crystal display device according to the present embodiment, when the illumination light 4 passes through the film, the illumination light 4 passes through the region 2 having a high refractive index. , When the phase difference between the light passing through the region 3 having a low refractive index and the scattering anisotropic film 1 occurs and the phase difference becomes equal to half the wavelength λ of the light 4, the strongest scattering occurs. So that the refractive index difference Δn (= |
n1-n2 |) and the thickness T of the film are

[Equation 10] Since the above relationship is satisfied, it is possible to observe the reflective liquid crystal display device in a state where the viewing area is widened and the scattering property is increased to make the display image bright and the blur is reduced.

(Second Embodiment) The structure of the scattering anisotropic film according to the present embodiment is the same as that of the first embodiment shown in FIG.
Is the same as the scattering anisotropic film 1 according to the embodiment of the present invention, except for the following points.

That is, in the scattering anisotropic film 1 according to the present embodiment, the refractive index difference Δn (= | n1-n2 |) and the thickness T of the film are

[Equation 11] I try to satisfy the relationship.

The scattering anisotropic film 1 according to the present embodiment is manufactured by the method disclosed in, for example, "Japanese Patent Laid-Open No. 2000-171619" and "Japanese Patent Laid-Open No. 11-352470". can do.

Next, in the scattering anisotropic film 1 according to the present embodiment configured as described above, when applied to a liquid crystal display device, light (illumination light) 4 incident from a wide angle is applied.
On the other hand, it is possible to observe in a state in which the viewing area is widened, the scattering property is increased to make the display image brighter, the yellow tint is reduced, and the blur is reduced.

That is, as shown in FIG. 1, the scattering anisotropic film 1 of the present embodiment has a difference of 0.
A structure of about 1 μm to 100 μm is formed with directionality in the thickness direction of the film.

The scattering anisotropic film 1 has a high scattering property when illuminated with the light 4 having the incident angle θ along the thickness direction of the film, and the scattering property decreases as the distance from the angle θ increases.

Scattering of the scattering anisotropic film 1 is caused by the illumination light 4
Is transmitted through the film, it is caused by the phase difference between the light transmitted through the region 2 having a high refractive index and the light transmitted through the region 3 having a low refractive index, and the phase difference is the wavelength λ of the light 4. When it is equal to half, it scatters most strongly.

Therefore, the respective refractive indices in the regions 2 and 3 having different refractive indices of the scattering anisotropic film 1 are n1 and n2, the thickness of the film is T, and the incident angle of the illumination light 4 in the film is θ. Assuming that the wavelength of the illumination light 4 is λ, the light can be scattered most efficiently when | n1−n2 | × T / cos (θ) = λ / 2.

This is obtained from the principle of diffraction, and in the case of the phase type diffraction grating, the highest diffraction efficiency can be easily obtained when the phase difference is half the wavelength.

In the case of a reflection type liquid crystal panel, as the illumination light 4 to be used, sunlight or room illumination is used, so that light of various wavelengths and various angles are incident.

The wavelength λ of the light 4 used is 400 of visible light.
The light 4 has a wavelength of nm to 650 nm, and the incident angle θ of the light 4 is about 0 to 45 degrees.

Further, since the liquid crystal and the polarizing plate generally have a yellowish tint, in order to strongly scatter the light excluding the wavelengths of red from yellow, it is necessary to strongly scatter the visible light of 400 nm to 500 nm. Good.

Therefore, the refractive index difference Δn (= | n1-n2
|) And the thickness T of the film are

[Equation 12] It is good to satisfy the relationship of.

Here, the refractive index difference Δn (= | n1-n2
|) Is generally determined by the properties of the material.

For example, as an example of the photopolymerization photopolymer constituting the film, use is made of the photopolymer disclosed in, for example, Japanese Patent Application Laid-Open No. 2-3081 or Japanese Patent Application Laid-Open No. 23082. You can

Examples of the actual photopolymerizable photopolymer products include Omnidex series (disclosed in Japanese Patent Laid-Open No. 5-27436) of DuPont.

For these photopolymerizable photopolymers, those having a refractive index difference Δn higher than 0.005 are 0.0
Some have been reported near four.

On actual products, there are many cases where the product changes from 0.01 to 0.02.

The average refractive index of these materials is
It is about 1.4 to 1.7.

Here, assuming a scattering anisotropic film 1 made of a material having a refractive index difference Δn = 0.01, if the thickness T of the film is in the range of 14000 nm to 25000 nm, the yellow tint is reduced. Scattering property is obtained.

Further, in order to strongly scatter light of 450 nm, which is less yellowish, the film thickness T should be 22
The vicinity of 500 nm is the most suitable.

On the other hand, assuming a scattering anisotropic film 1 made of a material having a refractive index difference Δn = 0.02, when the thickness T of the film is in the range of 7000 nm to 12500 nm, the yellowish scattering is reduced. Sex is obtained.

Further, in order to strongly scatter 450 nm light, which is less yellowish, the film thickness T should be 11
Around 250 nm is most suitable.

Scattering anisotropic film 1 according to the present embodiment
Is a plurality of regions 2 and 3 having different refractive indexes inside the film.
However, the film has a structure in which the layers are distributed along the thickness direction of the film or inclined with respect to the thickness direction of the film.

This inclination angle and the illumination light 4 in the film
The illuminating light 4 exhibits strong scattering when the traveling directions of the two coincide with each other.

When the average refractive index of the photopolymer forming the film is N2 and the illumination light 4 is incident from the medium having the refractive index N1 at an angle φ, the light is refracted at the boundary with the film and the illumination light 4 in the film is changed. The incident angle θ can be obtained by Snell's law represented by the following well-known formula.

N1sin (φ) = N2sin (θ) For example, when light 4 having a wavelength of 450 nm enters from air with a refractive index N1 = 1 at an angle of φ = 25 degrees, the average refractive index is 1. In the film of No. 5, it advances with an angle of θ = about 16.4 degrees.

Assuming that the refractive index difference Δn of the photopolymers constituting this film is 0.01, it is the highest when the film thickness T = 21585 nm from the relationship Δn × T / cos (θ) = λ / 2. It has a scattering property and further has a scattering property with reduced yellowness, and as a result, a film with reduced scattering and high scattering anisotropy can be obtained.

As described above, in the actual photopolymer,
A film thickness of about 3500 nm to 50000 nm is desirable, and a range of 7000 nm to 25000 nm is most desirable.

Therefore, by applying the scattering anisotropic film 1 of the present embodiment to the reflection type liquid crystal display device as shown in FIG. 2 described above, when the illumination light 4 is transmitted through the film, high refraction is achieved. By the phase difference between the light transmitted through the region 2 having a refractive index and the light transmitted through the region 3 having a low refractive index,
The scattering of the anisotropic scattering film 1 causes the phase difference of the light 4
When it becomes equal to half the wavelength λ of
Furthermore, the scattering property with reduced yellowness is obtained.

That is, in the scattering anisotropic film 1, the refractive index difference Δn (= | n1-n2 |) and the film thickness T are

[Equation 13] By satisfying the condition that
It is possible to realize a reflection type liquid crystal display device capable of observing in a state in which the viewing area is widened, the scattering property is increased to make the display image brighter, the yellow tint is reduced, and the blur is reduced.

As described above, in the scattering anisotropic film 1 and the reflection type liquid crystal display device according to the present embodiment, when the illumination light 4 passes through the film, the illumination light 4 passes through the region 2 having a high refractive index. , When the phase difference between the light passing through the region 3 having a low refractive index and the scattering anisotropic film 1 occurs and the phase difference becomes equal to half the wavelength λ of the light 4, the strongest scattering occurs. The refractive index difference Δn (= | n1-n2
|) And the thickness T of the film are

[Equation 14] Since the reflective liquid crystal display device has a wider viewing area and a higher scattering property to make the display image brighter, the yellow tint can be reduced, and the image can be observed with less blurring. It will be possible.

(Other Embodiments) It should be noted that the present invention is not limited to the above-described embodiments, and can be variously modified and carried out at the stage of carrying out the invention without departing from the spirit thereof. Is. In addition, the respective embodiments may be implemented in combination as appropriate as possible, and in that case, combined operation effects can be obtained. Further, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent features. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem (at least one) described in the section of the problem to be solved by the invention can be solved, and When the effect (at least one) described in the section can be obtained, a structure in which this constituent element is deleted can be extracted as an invention.

[0090]

As described above, according to the scattering anisotropic film of the present invention, when it is applied to a liquid crystal display device, the viewing area is widened and the scattering property is increased to make the displayed image brighter (more yellow). It is possible to observe with reduced taste) and reduced blur.

Further, according to the liquid crystal display device of the present invention, it is possible to observe the display image in a state in which the viewing area is widened and the scattering property is increased to make the displayed image bright (further reduce the yellow tint) and the blur is reduced. It will be possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing first and second embodiments of a scattering anisotropic film according to the present invention.

FIG. 2 is a cross-sectional view showing a configuration example of a reflective liquid crystal display device using the scattering anisotropic film according to the same embodiment.

[Explanation of symbols]

1 ... Scattering anisotropic film 2 ... High refractive index region (layer) 3 ... Area (layer) with low refractive index 4… Incident light (illumination light) 5 ... Reflective LCD panel 6 ... Observer 7 ... Reflector n1 ... Refractive index of region 2 n2 ... Refractive index of region 3 T ... film thickness θ: Incident angle of illumination light 4 λ: wavelength of illumination light 4

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Claims (7)

[Claims] 1. A film has a plurality of regions having different refractive indices, and the regions having different refractive indices are inclined along the thickness direction of the film or respectively with respect to the thickness direction of the film. Is a scattering anisotropic film having a structure in which the refractive index in each region having a different refractive index is n1.
And n2 (where n1 and n2 are n1> n2),
When the film thickness is T, the refractive index difference Δn (= | n1-n2 |) and the film thickness T are as follows: A scattering anisotropic film characterized by satisfying the following relationship. 2. The film has a plurality of regions having different refractive indices, and the regions having different refractive indices are inclined along the thickness direction of the film or respectively with respect to the thickness direction of the film. Is a scattering anisotropic film having a structure in which the refractive index in each region having a different refractive index is n1.
And n2 (where n1 and n2 are n1> n2),
When the film thickness is T, the refractive index difference Δn (= | n1-n2 |) and the film thickness T are as follows: A scattering anisotropic film characterized by satisfying the following relationship. 3. The scattering anisotropic film according to claim 1 or 2, wherein the scattering anisotropic film body has a thickness T when the refractive index difference Δn is 0.01. , 14000 nm ~
A scattering anisotropic film characterized by having a range of 32500 nm. 4. The thickness T of the scattering anisotropic film body in the scattering anisotropic film according to claim 1 or 2, when the refractive index difference Δn is 0.01. , 14000 nm ~
A scattering anisotropic film having a thickness in the range of 25000 nm. 5. In the scattering anisotropic film according to claim 1 or 2, when the refractive index difference Δn is 0.02, the thickness T of the scattering anisotropic film body is , 7,000 nm-1
A scattering anisotropic film having a thickness in the range of 6250 nm. 6. The scattering anisotropic film according to claim 1 or 2, wherein, when the refractive index difference Δn is 0.02, the thickness T of the scattering anisotropic film body is , 7,000 nm-1
A scattering anisotropic film having a thickness of 2500 nm. 7. A reflective liquid crystal panel for changing a display pattern by modulating transmission / non-transmission of incident light according to an applied voltage, and a reflective liquid crystal panel arranged on the back side (opposite the observer) of the reflective liquid crystal panel. And a reflection plate that reflects the incident light modulated by the reflection type liquid crystal panel and emits the light to the reflection type liquid crystal panel side, wherein the front side of the reflection type liquid crystal panel ( 7. A liquid crystal display device, characterized in that the scattering anisotropic film according to any one of claims 1 to 6 is arranged on the observer side).