WO2021095516A1

WO2021095516A1 - Optical film set and liquid crystal panel

Info

Publication number: WO2021095516A1
Application number: PCT/JP2020/040301
Authority: WO
Inventors: 俊樹大峰; 毅村重
Original assignee: 日東電工株式会社
Priority date: 2019-11-12
Filing date: 2020-10-27
Publication date: 2021-05-20
Also published as: TW202132877A; KR20220097895A; CN114651205A; JP2021076778A

Abstract

This liquid crystal panel has: a liquid crystal cell having a liquid crystal layer sandwiched between two transparent substrates; a first optical film provided on the viewed side of the liquid crystal cell via a first adhesive layer; and a second optical film provided to a backlight side of the liquid crystal cell via a second adhesive layer, wherein the total thickness of the two transparent substrates is no greater than 450 μm, the first optical film has a glass film and a first polarization plate, the thickness of the glass film is 50-150 μm, and the first polarization plate has a polarizer having a thickness of no greater than 15 μm.

Description

Optical film set, LCD panel

The present invention relates to an optical film set and a liquid crystal panel.

In recent years, liquid crystal display elements and display elements using organic EL (Organic Electro-Luminescence) have been made lighter and thinner from the viewpoint of storage and design. Conventionally, a cover glass has been used as the outermost surface of a display element, and after the polarizing plate is attached to a liquid crystal cell or the like, the cover glass is provided on the polarizing plate via an interlayer filler.

In Patent Document 1, in a liquid crystal panel obtained from a polarizing film and a liquid crystal cell, a technique for suppressing warpage of the polarizing film integrated with the liquid crystal panel, particularly the liquid crystal panel due to the influence of shrinkage of the polarizing film in a high temperature environment, is provided. It is disclosed.

Japanese Unexamined Patent Publication No. 2015-722384 International Publication No. 2019/087938

On the other hand, there is also an effort to simplify the process of bonding the cover glass and the polarizing plate via an interlayer filler by integrating the ultra-thin glass (glass film) with the polarizing plate in advance and bonding it to a liquid crystal cell or the like. It has been done.

Patent Document 2 discloses that a glass film laminate having excellent strength and flexibility against contact with a protrusion having high hardness such as a pen is used for the outermost layer of a display element or a lighting element. Specifically, as a glass film laminate used for a display element, an optical film in which a glass film, an adhesive layer, a protective film, a polarizer, and an adhesive layer are laminated in this order has been proposed.

Here, the present inventors make a glass film laminate into a predetermined size by processing such as laser or cutting according to an application such as a notebook computer, and attach it to a liquid crystal cell to form a liquid crystal panel, which is durable in a heating environment. The test was conducted. As a result, when the liquid crystal panel was photographed and observed, it was found that the color of the edge portion of the liquid crystal panel was changed as compared with the central portion of the liquid crystal panel.

Further, when the liquid crystal panel was made of an optical film not provided with a glass film, the present inventors could confirm that the warp was suppressed in a high temperature environment, and the color of the edge of the liquid crystal panel was confirmed. It was also confirmed that no change had occurred.

From the above studies, the present inventors have found that the change in the color of the edge of the liquid crystal panel occurs only in the liquid crystal panel satisfying a specific condition.

The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid crystal panel in which color change is suppressed even in a heating environment.

The liquid crystal panel includes a liquid crystal cell having a liquid crystal layer sandwiched between two transparent substrates, a first optical film provided on the visible side of the liquid crystal cell via a first pressure-sensitive adhesive layer, and the liquid crystal cell. The first optical film has a second optical film provided on the back light side of the film via a second pressure-sensitive adhesive layer, and the total thickness of the two transparent substrates is 450 μm or less. The glass film has a glass film and a first polarizing plate, and the thickness of the glass film is 50 μm or more and 150 μm or less, and the first polarizing plate has a polarizer having a thickness of 15 μm or less.

According to the disclosed technology, it is possible to provide a liquid crystal panel in which color change is suppressed even in a heating environment.

It is sectional drawing which illustrates the optical film set which concerns on 1st Embodiment. It is sectional drawing which illustrates the liquid crystal panel which concerns on 2nd Embodiment.

Hereinafter, a mode for carrying out the invention will be described with reference to the drawings. In each drawing, the same components may be designated by the same reference numerals and duplicate description may be omitted.

<First Embodiment>
FIG. 1 is a cross-sectional view illustrating the optical film set according to the first embodiment. Referring to FIG. 1, the optical film set 1 includes a first optical film 10 and a second optical film 20.

The first optical film 10 includes a first glass film 11, a first adhesive layer 12, and a first polarizing plate 13 in this order.

In the present specification, the pressure-sensitive adhesive layer means a layer that has adhesiveness at room temperature and adheres to an adherend with a light pressure. Therefore, even when the adherend attached to the pressure-sensitive adhesive layer is peeled off, the pressure-sensitive adhesive layer retains a practical adhesive force. On the other hand, the adhesive layer is a layer capable of binding substances by interposing between the substances. Therefore, when the adherend attached to the adhesive layer is peeled off, the adhesive layer does not have a practical adhesive force.

The first polarizing plate 13 has a first polarizer 131 and a first protective film 132. The first protective film 132 is arranged on at least one side (one side) of the first polarizer 131. The first protective film 132 is preferably arranged at least on the side of the first adhesive layer 12 of the first polarizer 131, but if necessary, both sides of the first polarizer (one surface and the other). It may be arranged on the surface of).

If necessary, the first retardation layer may be arranged on the side of the first polarizing plate 13 opposite to the first adhesive layer 12. The first retardation layer can be laminated on the first polarizing plate 13 via any suitable adhesive layer or adhesive layer. Further, if necessary, the first pressure-sensitive adhesive layer may be arranged on the side of the first polarizer 131 of the first polarizing plate 13, or the first mold release may be provided via the first pressure-sensitive adhesive layer. The film may be placed.

The second optical film 20 includes a second polarizing plate 23.

The second polarizing plate 23 has a second polarizer 231. The second polarizing plate 23 may include a second protective film 232 arranged on one side or both sides of the second polarizer 231 as required.

If necessary, a second retardation layer may be arranged on the second polarizer 231 side of the second polarizing plate 23. The second retardation layer can be laminated on the second polarizing plate 23 via any suitable adhesive layer or adhesive layer. Further, if necessary, a second pressure-sensitive adhesive layer may be arranged on the second polarizer 231 side of the second polarizing plate 23, or a second mold release may be provided via the second pressure-sensitive adhesive layer. The film may be placed. Further, if necessary, an optical layer may be arranged on the second protective film 232 side of the second polarizing plate 23. The optical layer can be laminated to the second protective film 232 via any suitable adhesive layer or adhesive layer.

Hereinafter, each component of the optical film set 1 will be described in more detail.

(First optical film)
[First glass film]
The first glass film 11 is not particularly limited, and an appropriate one can be adopted depending on the intended purpose. According to the classification according to the composition, the first glass film 11 includes, for example, soda-lime glass, borosilicate glass, aluminosilicate glass, quartz glass and the like. Further, according to the classification according to the alkaline component, non-alkali glass and low-alkali glass can be mentioned. The content of the alkali metal component (for example, Na ₂ O, K ₂ O, Li ₂ O) of the glass is preferably 15% by weight or less, and more preferably 10% by weight or less.

The thickness of the first glass film 11 is preferably 50 μm to 150 μm, more preferably 60 μm to 140 μm, further preferably 70 μm to 130 μm, and particularly preferably 80 μm to 120 μm. Within such a range, the first optical film 10 which is excellent in flexibility, can be processed by a roll-to-roll process, and the glass film is not easily cracked and is excellent in productivity can be obtained.

The light transmittance of the first glass film 11 at a wavelength of 550 nm is preferably 85% or more. The refractive index of the first glass film 11 at a wavelength of 550 nm is preferably 1.4 to 1.65.

The density of the first glass film 11 is preferably 2.3 g / cm ³ to 3.0 g / cm ³ , and more preferably 2.3 g / cm ³ to 2.7 g / cm ³ . With the glass film in the above range, it is possible to provide an optical film set 1 that can contribute to weight reduction of image display.

The molding method of the first glass film 11 is not particularly limited, and an appropriate one can be adopted according to the purpose. Typically, the first glass film 11 is a mixture containing a main raw material such as silica and alumina, a defoaming agent such as sardine glass and antimony oxide, and a reducing agent such as carbon at about 1400 ° C to 1600 ° C. It can be produced by melting at the above temperature, forming it into a thin plate, and then cooling it. Examples of the molding method of the first glass film 11 include a slot down draw method, a fusion method, and a float method. The glass film formed into a plate shape by these methods may be chemically polished with a solvent such as hydrofluoric acid, if necessary, in order to thin the plate or improve the smoothness.

[First adhesive layer]
The first adhesive layer 12 is not particularly limited, and an appropriate adhesive can be adopted depending on the intended purpose. Examples of the adhesive include polyester adhesives, polyurethane adhesives, polyvinyl alcohol adhesives, and epoxy adhesives. Among these, an epoxy-based adhesive that can obtain particularly good adhesion is preferable.

When the first adhesive layer 12 is a thermosetting adhesive, it can exhibit peeling resistance by heating and curing (solidifying). Further, when the first adhesive layer 12 is a photocurable adhesive such as an ultraviolet curable type, the peeling resistance can be exhibited by irradiating the first adhesive layer 12 with light such as ultraviolet rays and curing the adhesive. Further, when the first adhesive layer 12 is a moisture-curable adhesive, it can be cured by reacting with moisture in the air or the like, so that it can be cured even if left unattended to exhibit peeling resistance.

For the first adhesive layer 12, for example, a commercially available adhesive may be used, or various curable resins may be dissolved or dispersed in a solvent to prepare an adhesive solution (or dispersion liquid).

The thickness of the first adhesive layer 12 is preferably 10 μm or less, more preferably 0.1 μm to 10 μm, still more preferably 0.5 μm to 8 μm, and particularly preferably 1 μm to 6 μm. Within such a range, the first optical film 10 having excellent flexibility and puncture resistance can be obtained.

The elastic modulus of the first adhesive layer 12 is preferably 0.5 GPa to 15 GPa, more preferably 0.8 GPa to 10 GPa, and further preferably 1 GPa to 5 GPa. Within such a range, the first optical film 10 having excellent flexibility and puncture resistance can be obtained. In the present specification, the elastic modulus can be measured under the following conditions using an autograph.

[Modulus measurement method]
Measurement temperature: 23 ° C
Sample size: width 2 cm, length 15 cm
Distance between chucks: 10 cm
Tensile speed: 10 mm / min.

[First polarizing plate]
The thickness of the first polarizing plate 13 is preferably 5 μm to 300 μm, more preferably 10 μm to 250 μm, still more preferably 25 μm to 200 μm, and particularly preferably 25 μm to 100 μm.

The elastic modulus of the first polarizing plate 13 is preferably 1 GPa or more, more preferably 1 GPa to 10 GPa, further preferably 2 GPa to 7 GPa, and particularly preferably 2 GPa to 5 GPa. Within such a range, the first optical film 10 having excellent puncture resistance can be obtained.

The shape of the first polarizing plate 13 is not particularly limited, and an appropriate shape can be adopted depending on the purpose. As an example, a square shape having a long side and a short side can be mentioned. When the first polarizing plate 13 has a rectangular shape, the absorption axis direction of the first polarizing element 131 of the first polarizing plate 13 and the long side or the short side of the first polarizing plate 13 are substantially parallel to each other. Is preferable. In addition, in this specification, "substantially parallel" is a concept including not only the case where it is strictly parallel but also the case where the angle formed by both lines is ± 10 ° (preferably ± 5 °).

[First Polarizer]
The thickness of the first polarizer 131 is not particularly limited, and an appropriate thickness can be adopted depending on the intended purpose. The thickness of the first polarizer 131 is typically about 1 μm to 80 μm. A thin polarizer may be used as the first polarizer 131. In this case, the thickness of the first polarizer 131 is preferably 20 μm or less, more preferably 15 μm or less.

In particular, when the thickness of the first polarizer 131 is 15 μm or less, the heating environment is formed when the first optical film 10 and the second optical film 20 are arranged on both sides of the liquid crystal cell to form a liquid crystal panel. Even below (for example, 80 ° C.), the change in color of the edge of the liquid crystal panel can be suppressed.

The first polarizer 131 preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm. The simple substance transmittance of the polarizer is preferably 40.0% or more, more preferably 41.0% or more, still more preferably 42.0% or more, and particularly preferably 43.0% or more. The degree of polarization of the first polarizer 131 is preferably 99.8% or more, more preferably 99.9% or more, and further preferably 99.95% or more.

The first polarizer 131 is preferably an iodine-based polarizer. More specifically, the polarizer can be composed of a polyvinyl alcohol-based resin (hereinafter, referred to as "PVA-based resin") film containing iodine.

The PVA-based resin that forms the PVA-based resin film is not particularly limited, and an appropriate resin can be used depending on the intended purpose. Examples thereof include polyvinyl alcohol and ethylene-vinyl alcohol copolymers.

Polyvinyl alcohol is obtained by saponifying polyvinyl acetate. The ethylene-vinyl alcohol copolymer is obtained by saponifying the ethylene-vinyl acetate copolymer. The degree of saponification of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. Is. The degree of saponification is determined according to JIS K 6726-1994. By using a PVA-based resin having such a degree of saponification, a polarizer having excellent durability can be obtained. If the degree of saponification is too high, gelation may occur.

The average degree of polymerization of the PVA-based resin is not particularly limited and can be appropriately selected according to the purpose. The average degree of polymerization of the PVA-based resin is, for example, 1000 to 10000, preferably 1200 to 5000, and more preferably 1500 to 4500. The average degree of polymerization is determined according to JIS K 6726-1994.

Examples of the method for producing the first polarizer 131 include a method (I) of stretching and dyeing a single PVA-based resin film, and a method (i) of stretching and dyeing a laminate (i) having a resin base material and a polyvinyl alcohol-based resin layer. Method (II) and the like. Since the method (I) is a well-known and commonly used method in the art, detailed description thereof will be omitted.

In the method (II), preferably, a laminate (i) having a resin base material and a polyvinyl alcohol-based resin layer formed on one side of the resin base material is stretched and dyed, and polarized light is applied onto the resin base material. Including the step of producing a child. The laminate (i) can be formed by applying and drying a coating liquid containing a polyvinyl alcohol-based resin on a resin base material. Further, the laminate (i) may be formed by transferring the polyvinyl alcohol-based resin layer onto the resin base material. Details of the production method (II) are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580, and this publication can be incorporated herein by reference.

[First protective film]
The first protective film 132 is not particularly limited, and an appropriate resin film can be used depending on the intended purpose. Examples of the material for forming the first protective film 132 include polyester resins such as polyethylene terephthalate (PET), cellulose resins such as triacetyl cellulose (TAC), cycloolefin resins such as norbornene resins, polyethylene, and polypropylene. Such as olefin resin, (meth) acrylic resin and the like. Among these, polyethylene terephthalate (PET) is preferable. The "(meth) acrylic resin" refers to an acrylic resin and / or a methacrylic resin.

As the (meth) acrylic resin, for example, a (meth) acrylic resin having a glutarimide structure is used. Examples of the (meth) acrylic resin having a glutarimide structure (hereinafter, also referred to as glutarimide resin) include JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, and JP-A. 2006-328334, 2006-337491, 2006-337492, 2006-337493, 2006-337569, 2007-009182, 2009- It is described in Japanese Patent Application Laid-Open No. 161744 and Japanese Patent Application Laid-Open No. 2010-284840. These statements may be incorporated herein by reference.

The first protective film 132 and the first polarizer 131 can be laminated via any suitable adhesive layer. The resin base material used in the production of the first polarizer 131 is peeled off before or after the first protective film 132 and the first polarizer 131 are laminated.

The thickness of the first protective film 132 is preferably 4 μm to 250 μm, more preferably 5 μm to 150 μm, further preferably 10 μm to 100 μm, and particularly preferably 10 μm to 50 μm.

The elastic modulus of the first protective film 132 is 1 GPa or more, preferably 1 GPa to 10 GPa, more preferably 1.8 GPa to 7 GPa, and further preferably 2 GPa to 5 GPa. Within such a range, the first optical film 10 having excellent puncture resistance can be obtained.

[First retardation layer]
As described above, the first retardation layer is not an essential configuration and is provided as needed. The first retardation layer is not particularly limited and may have any suitable optical property and / or mechanical property depending on the purpose. The first retardation layer typically has a slow axis. The optical and / or mechanical properties of the first retardation layer can be appropriately selected depending on the orientation mode of the liquid crystal cell.

The first retardation layer may exhibit a reverse dispersion wavelength characteristic in which the retardation value increases according to the wavelength of the measurement light, and a positive wavelength dispersion characteristic in which the retardation value decreases according to the wavelength of the measurement light. It may be shown, or may show a flat wavelength dispersion characteristic in which the phase difference value hardly changes with the wavelength of the measurement light.

The thickness of the first retardation layer is preferably 60 μm or less, more preferably 30 μm to 55 μm, and further preferably 30 μm or less.

The first retardation layer can be made of any suitable resin film that can satisfy the above characteristics. Typical examples of such resins are cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins, and acrylics. Examples thereof include based resins and polymer liquid crystal resins.

[First adhesive layer]
As described above, the first pressure-sensitive adhesive layer is not an essential configuration and is provided as needed. The first pressure-sensitive adhesive layer can be formed from any suitable pressure-sensitive adhesive. As the pressure-sensitive adhesive, for example, a pressure-sensitive adhesive based on a polymer such as an acrylic polymer, a silicone-based polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based polymer, or a rubber-based polymer is used. Preferably, an acrylic pressure-sensitive adhesive is used. This is because the acrylic pressure-sensitive adhesive is excellent in optical transparency, exhibits appropriate wettability, cohesiveness, and adhesiveness, and can be excellent in weather resistance, heat resistance, and the like. In particular, an acrylic pressure-sensitive adhesive made of an acrylic polymer having 4 to 12 carbon atoms is preferable.

The first pressure-sensitive adhesive layer is formed from the pressure-sensitive adhesive. The thickness of the first pressure-sensitive adhesive layer is not particularly limited, and is, for example, about 1 to 400 μm. Further, the thickness of the first pressure-sensitive adhesive layer can be appropriately set in a preferable range depending on the method for producing the (meth) acrylic polymer used for the pressure-sensitive adhesive. For example, when a (meth) acrylic polymer is produced by solution polymerization or the like, the thickness of the first pressure-sensitive adhesive layer is preferably 1 to 100 μm, more preferably 2 to 50 μm, further preferably 2 to 40 μm, and 5 ~ 35 μm is particularly preferable. When a (meth) acrylic polymer is produced by radiation polymerization or the like, the thickness of the first pressure-sensitive adhesive layer is preferably 50 to 400 μm, more preferably 75 to 300 μm, and even more preferably 100 to 200 μm.

Solution polymerization is suitable for producing an acrylic polymer with such a thickness.

[First release film]
As described above, the first release film is not an essential configuration and is provided as needed. The first release film can be formed of, for example, a resin of polyethylene terephthalate (PET). The thickness of the first release film is preferably 5 μm to 200 μm, more preferably 10 μm to 100 μm, and even more preferably 30 μm to 50 μm. The first release film is peeled off at the interface with the first pressure-sensitive adhesive layer before the first optical film 10 is attached to an optical element such as a liquid crystal cell.

(Second optical film)
The dimensional change of the second optical film 20 is preferably 0.5% or less, more preferably 0% to 0.2%. The optical film set 1 is a combination of a first optical film 10 including a first glass film 11 and a second optical film 20 exhibiting a dimensional change as described above. Therefore, by arranging the first optical film 10 and the second optical film 20 on both sides of the liquid crystal cell, a liquid crystal panel with less warpage (first optical film / liquid crystal cell / second optical film) can be obtained. Be done.

_{The dimensional change is the dimensional change when a rectangular sample having a length of X 0} (for example, 20 cm) in the absorption axis direction of the second polarizer 231 is allowed to stand in an environment at a temperature of 80 ° C. for 150 hours. The rate (| length in the absorption axis direction before the test X _0- length in the absorption axis direction after the test X ₁ | / length in the absorption axis direction before the test X ₀ ) × 100. The dimensional change can be measured by a plane biaxial length measuring machine, for example, Quick Vision (manufactured by Mitutoyo).

[Second polarizing plate]
The thickness of the second polarizing plate 23 is preferably 5 μm to 250 μm, more preferably 10 μm to 200 μm, further preferably 25 μm to 200 μm, and particularly preferably 25 μm to 100 μm.

The shape of the second polarizing plate 23 is not particularly limited, and an appropriate shape can be adopted depending on the purpose. As an example, a square shape having a long side and a short side can be mentioned. When the second polarizing plate 23 has a rectangular shape, the absorption axis direction of the second polarizing element 231 of the second polarizing plate 23 and the long side or the short side of the second polarizing plate 23 are substantially parallel to each other. Is preferable.

As an example, the relationship between the second polarizing plate 23 and the first polarizing plate 13 is such that the absorption axis direction of the first polarizing element 131 and the short side of the first polarizing plate 13 are substantially parallel to each other. The absorption axis of the second polarizer 231 and the long side of the second polarizing plate 23 are substantially parallel to each other.

As for the relationship between the second polarizing plate 23 and the first polarizing plate 13, as another example, the absorption axis direction of the first polarizing element 131 and the long side of the first polarizing plate 13 are substantially parallel. Moreover, the absorption axis of the second polarizer 231 and the short side of the second polarizing plate 23 are substantially parallel to each other.

[Second Polarizer]
The thickness of the second polarizer 231 is preferably 1 μm or more and 10 μm or less. When the thickness of the second polarizer 231 is 1 μm or more and 10 μm or less, the second optical film 20 with little dimensional change can be obtained. If the thickness of the second polarizer 231 is 10 μm or less, the liquid crystal panel is formed when the first optical film 10 and the second optical film 20 are arranged on both sides of the liquid crystal cell to form the liquid crystal panel. Warp can be suppressed.

Regarding the simple substance transmittance, material, manufacturing method, etc. of the second polarizer 231, the same description as that of the above-mentioned first polarizer 131 can be exemplified.

[Second protective film]
As the second protective film 232, for example, a protective film similar to the above-mentioned first protective film 132 is used.

[Second retardation layer]
As described above, the second retardation layer is not an essential configuration and is provided as needed. As the second retardation layer, for example, a retardation layer similar to the first retardation layer described above is used.

[Optical layer]
As described above, the optical layer is not an essential configuration and is provided as needed. Examples of the optical layer include a reflective polarizer and the like. The thickness of the optical layer is, for example, 1 μm to 200 μm.

As the reflective polarizer, for example, those described in JP-A-9-507308 can be used. As the reflective polarizer, a commercially available product may be used as it is, or the commercially available product may be used after secondary processing (for example, stretching). Examples of commercially available products include the product name DBEF manufactured by 3M and the product name APF building manufactured by 3M.

[Second adhesive layer]
As described above, the second pressure-sensitive adhesive layer is not an essential configuration and is provided as needed. The second pressure-sensitive adhesive layer can be formed from any suitable pressure-sensitive adhesive. The pressure-sensitive adhesive may be the same except for the thickness of the first pressure-sensitive adhesive layer.

The thickness of the second pressure-sensitive adhesive layer is 50 μm or more and 200 μm or less. When the thickness of the second pressure-sensitive adhesive layer is 50 μm or more and 200 μm or less, the resistance to cracking of the first glass film 11 can be improved when the liquid crystal panel 2 described later is configured. In particular, when the thickness of the first glass film 11 is 50 μm or more and 150 μm or less, the first glass film 11 is thin and easily broken. Therefore, it is significant to set the thickness of the second pressure-sensitive adhesive layer to 50 μm or more and 200 μm or less to improve the resistance of the first glass film 11 to cracking.

Radiation polymerization is suitable for producing an acrylic polymer with such a thickness.

[Second release film]
As described above, the second release film is not an essential configuration and is provided as needed. The second release film can be formed of, for example, a resin of polyethylene terephthalate (PET). The thickness of the second release film is preferably 5 μm to 200 μm, more preferably 10 μm to 100 μm, and even more preferably 30 μm to 50 μm. The second release film is peeled off at the interface with the second pressure-sensitive adhesive layer before the second optical film 20 is attached to an optical element such as a liquid crystal cell.

As will be described later, the optical film set 1 can be used for, for example, a liquid crystal cell having a liquid crystal layer sandwiched between two transparent substrates and having a total thickness of 450 μm or less of the two transparent substrates. At this time, the first optical film 10 is provided, for example, on the visible side of the liquid crystal cell via the first adhesive layer, and functions as a front plate of the liquid crystal panel. The second optical film 20 is provided, for example, on the back surface side of the liquid crystal cell via the second pressure-sensitive adhesive layer. The visual side means a side facing the side to be visually recognized when the predetermined member is applied to the image display device. The back side is the side opposite to the visual recognition side (backlight side).

<Second Embodiment>
The second embodiment shows an example of a liquid crystal panel having an optical film set according to the first embodiment. In the second embodiment, the description of the same components as those in the above-described embodiment may be omitted.

FIG. 2 is a cross-sectional view illustrating the liquid crystal panel according to the second embodiment. Referring to FIG. 2, the liquid crystal panel 2 includes a first optical film 10, a liquid crystal cell 30, and a second optical film 20 in this order from the viewing side.

That is, in the liquid crystal panel 2, the first optical film 10 is laminated on the visible side of the liquid crystal cell 30 via the first adhesive layer 14, and the second optical film 20 is opposite to the visible side of the liquid crystal cell 30. It is laminated on the side (backlight side) via the second pressure-sensitive adhesive layer 24.

In the liquid crystal panel 2, for example, the first glass film 11, the first adhesive layer 12, the first polarizing plate 13, the first pressure-sensitive adhesive layer 14, the liquid crystal cell 30, the second pressure-sensitive adhesive layer 24, and The second polarizing plate 23 can be arranged in this order from the viewing side. However, as described above, the liquid crystal panel 2 may have a first retardation layer, a second retardation layer, an optical layer, and the like, if necessary.

The liquid crystal cell 30 has a liquid crystal layer 31 sandwiched between two

transparent substrates

32 and 33. That is, the

transparent substrates

32 and 33 sandwich the liquid crystal layer 31, which is a display medium, from both sides.

The liquid crystal layer 31 contains, for example, liquid crystal molecules homogenically oriented in the absence of an electric field. As the liquid crystal layer 31, for example, an IPS type liquid crystal layer is preferably used, but a TN type, STN type, π type, VA type or the like liquid crystal layer may be used. The thickness of the liquid crystal layer 31 is, for example, about 1.5 μm to 4 μm.

Since the liquid crystal cell 30 is thinned in consideration of mounting on a notebook PC or the like, the total thickness of the two

transparent substrates

32 and 33 is 450 μm or less. The

transparent substrates

32 and 33 have, for example, the same thickness. The

transparent substrates

32 and 33 are made of, for example, glass.

The liquid crystal cell 30 is, for example, an in-cell type. When the liquid crystal cell 30 is an in-cell type, for example, a touch sensing electrode portion having a touch sensor or a touch drive function is provided between the transparent substrate 32 and the transparent substrate 33. The liquid crystal cell 30 may have a color filter or the like.

When the inventors have thin

transparent substrates

32 and 33 having a total thickness of 450 μm or less, such as the liquid crystal cell 30, when a durability test is performed in a heating environment (for example, 80 ° C.), the liquid crystal panel 2 is subjected to a durability test. It has been found that the color of the edge portion may change as compared with the central portion of the liquid crystal panel 2. The change in color of the edge of the liquid crystal panel 2 in a heating environment depends on the thickness of the first polarizing element 131 constituting the first polarizing plate 13, and the thickness of the first polarizing element 131 is 15 μm or less. Then, it was found that the change in color of the edge of the liquid crystal panel 2 was suppressed even in a heating environment.

That is, in the first optical film 10, since the first polarizing plate 13 has the first polarizing element 131 having a thickness of 15 μm or less, the color change of the edge portion of the liquid crystal panel 2 is suppressed even in a heating environment. To.

Further, the inventors have stated that the warp of the liquid crystal panel 2 depends on the thickness of the second polarizing element 231 constituting the second polarizing plate 23, and that the thickness of the second polarizer 231 is 10 μm or less. It was found that the warp of the panel 2 was suppressed.

That is, in the second optical film 20, the warp of the liquid crystal panel 2 is suppressed by having the second polarizing plate 231 having a thickness of 10 μm or less in the second polarizing plate 23.

It is preferable that the liquid crystal panel 2 is configured such that the absorption axis of the first polarizer 131 and the absorption axis of the second polarizer 231 are substantially orthogonal to each other. With such a configuration, a liquid crystal panel 2 that is less likely to warp can be obtained. The term "substantially orthogonal" is a concept that includes not only the case of being strictly orthogonal but also the case where the angle formed by both lines is 90 ° ± 10 ° (preferably 90 ° ± 5 °).

[Example]
Hereinafter, the optical film set and the liquid crystal panel will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Further, in the examples, unless otherwise specified, "parts" and "%" are based on weight.

[Production Example 1] Preparation of Polarizing Plate A Polyvinyl alcohol film (PVA) having a thickness of 30 μm is dyed three times in rolls having different speed ratios in an iodine solution at 30 ° C. and a 0.3% concentration for 1 minute. Stretched to. Then, the total stretching ratio was stretched to 6 times while being immersed in an aqueous solution containing boric acid having a concentration of 4% and potassium iodide having a concentration of 10% at 60 ° C. for 0.5 minutes. Then, it was washed by immersing it in an aqueous solution containing potassium iodide having a concentration of 4.0% at 30 ° C. for 10 seconds, and then dried at 50 ° C. for 4 minutes to obtain a polarizer having a thickness of 15 μm. A saponified 25 μm-thick triacetyl cellulose film (TAC) is attached to one side of the polarizing element, and a 20 μm-thick acrylic resin film is attached to the other side with a polyvinyl alcohol-based adhesive. Thickness: 60 μm) was obtained.

[Manufacturing Example 2] Preparation of polarizing plate B (preparation of polarizer)
First, a stretched laminate in which a 9 μm-thick PVA layer was formed on an amorphous PET substrate was subjected to aerial auxiliary stretching at a stretching temperature of 130 ° C. to produce a stretched laminate. Next, the stretched laminate was dyed to produce a colored laminate, and the colored laminate was further stretched in boric acid at a stretching temperature of 65 ° C. to obtain a total stretching ratio of 5.94 times with an amorphous PET substrate. An optical film laminate containing a 5 μm-thick PVA layer stretched integrally was produced.

The PVA molecules in the PVA layer formed on the amorphous PET substrate by such two-step stretching are highly oriented, and the iodine adsorbed by dyeing is highly oriented in one direction as a polyiodine ion complex. It was possible to generate an optical film laminate containing a PVA layer having a thickness of 5 μm, which constitutes a high-performance polarizer.

(Preparation of acrylic film)
A methacrylic resin pellet having a glutarimide ring unit was dried at 100.5 kPa at 100 ° C. for 12 hours, and extruded from a T-die at a die temperature of 270 ° C. using a single-screw extruder to form a film. This film was stretched in the transport direction (MD direction) in an atmosphere 10 ° C. higher than the Tg of the resin, and then stretched in the direction orthogonal to the film transport direction (TD direction) in an atmosphere 7 ° C. higher than the Tg of the resin. Acrylic films having thicknesses of 20 μm, 30 μm, and 40 μm were obtained, respectively.

(Preparation of curable adhesive)
35 parts by weight of N-hydroxyethylacrylamide HEAA (manufactured by Kojin Co., Ltd.), 45 parts by weight of N-acryloyl morpholine ACMO (manufactured by Kojin Co., Ltd.), and polypropylene glycol diacrylate TPGDA (manufactured by Toa Synthetic Co., Ltd., "trade name" Aronix M. -220) 25 parts by weight, 3 parts by weight of photopolymerization initiator (manufactured by Ciba Specialty Chemicals, trade name "Irgacure 184"), another photopolymerization initiator (manufactured by Nippon Kayaku Co., Ltd., trade name "KAYACUREDETX") -S ") was mixed with 1.5 parts by weight to obtain a curable adhesive.

(Preparation of polarizing plate)
The above-mentioned curable adhesive was applied to a polarizer produced on a PET film with a coating thickness of about 1 μm. Next, the 40 μm (elastic modulus 2.5 GPa) acrylic film was attached to the adhesive layer. Conveyor type UV irradiation device (manufactured by fusion) from the PET film side, peak UV illuminance; 1600 mW / cm ² , UV integrated light ^{intensity: 1000 mJ / cm 2} (wavelength 380 to 440 nm), and the adhesive irradiated with ultraviolet rays is cured. It was dried at 70 ° C. for 2 minutes. Finally, the PET film was peeled off from the laminate in which the acrylic film, the polarizer, and the PET film were laminated to obtain a laminate of the acrylic film (protective film) and the polarizer (polarizing plate B having a thickness of 45 μm). ..

[Production Example 3] Preparation of Polarizing Plate C PVA having a thickness of 75 μm was stretched up to 3 times while being stained in an iodine solution at 30 ° C. and a 0.3% concentration for 1 minute between rolls having different speed ratios. Then, the total stretching ratio was stretched to 6 times while being immersed in an aqueous solution containing boric acid having a concentration of 4% and potassium iodide having a concentration of 10% at 60 ° C. for 0.5 minutes. Then, it was washed by immersing it in an aqueous solution containing potassium iodide having a concentration of 4.0% at 30 ° C. for 10 seconds, and then dried at 50 ° C. for 4 minutes to obtain a polarizer having a thickness of 28 μm. A saponified 40 μm-thick triacetyl cellulose film (TAC) is attached to one side of the polarizing element, and a 30 μm-thick acrylic resin film is attached to the other side with a polyvinyl alcohol-based adhesive. Thickness: 98 μm) was obtained.

[Production Example 4] Preparation of Polarizing Plate D PVA having a thickness of 60 μm was stretched up to 3 times while being stained in an iodine solution at 30 ° C. and a 0.3% concentration for 1 minute between rolls having different speed ratios. Then, the total stretching ratio was stretched to 6 times while being immersed in an aqueous solution containing boric acid having a concentration of 4% and potassium iodide having a concentration of 10% at 60 ° C. for 0.5 minutes. Then, it was washed by immersing it in an aqueous solution containing potassium iodide having a concentration of 4.0% at 30 ° C. for 10 seconds, and then dried at 50 ° C. for 4 minutes to obtain a polarizer having a thickness of 23 μm. A saponified 40 μm-thick triacetyl cellulose film (TAC) is attached to one side of the polarizing element, and a 30 μm-thick acrylic resin film is attached to the other side with a polyvinyl alcohol-based adhesive. Thickness: 93 μm) was obtained.

[Production Example 5] Preparation of Polarizing Plate E PVA having a thickness of 45 μm was stretched up to 3 times while being stained in an iodine solution at 30 ° C. and a 0.3% concentration for 1 minute between rolls having different velocity ratios. Then, the total stretching ratio was stretched to 6 times while being immersed in an aqueous solution containing boric acid having a concentration of 4% and potassium iodide having a concentration of 10% at 60 ° C. for 0.5 minutes. Then, it was washed by immersing it in an aqueous solution containing potassium iodide having a concentration of 4.0% at 30 ° C. for 10 seconds, and then dried at 50 ° C. for 4 minutes to obtain a polarizer having a thickness of 18 μm. A saponified 40 μm-thick triacetyl cellulose film (TAC) is attached to one side of the polarizing element, and a 30 μm-thick acrylic resin film is attached to the other side with a polyvinyl alcohol-based adhesive. Thickness: 88 μm) was obtained.

[Manufacturing Example 6] Preparation of Adhesive (Preparation of Acrylic Polymer)
In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler, 100 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid and 0.075 parts by weight of 2-hydroxyethyl acrylate, and 2 as a polymerization initiator. , 2'-Azobisisobutyronitrile 0.2 parts by weight and ethyl acetate 200 parts by weight as a polymerization solvent were charged, and after sufficient nitrogen substitution, the liquid temperature in the flask was adjusted to around 55 ° C. while stirring under a nitrogen stream. The polymerization reaction was carried out for 10 hours to prepare an acrylic polymer solution. The weight average molecular weight of the acrylic polymer was 2.2 million.

(Preparation of adhesive composition)
Dibenzoyl peroxide (Niper BMT, manufactured by Nippon Polyurethane Industry Co., Ltd.) 0.2 parts by weight as a peroxide in 100 parts by weight of the solid content of the acrylic polymer solution, and diglycidylaminomethylcyclohexane (Mitsubishi) as an epoxy-based cross-linking agent. 0.05 parts by weight of Tetrad C) manufactured by Gas Chemicals, 0.1 parts by weight of trimethylolpropane / tolylene diisocyanate adduct (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as an isocyanate-based crosslinker, and a silane coupling agent. (KBM403, manufactured by Shin-Etsu Chemical Industry Co., Ltd.) 0.075 parts by weight were uniformly mixed and stirred to prepare an acrylic pressure-sensitive adhesive (solid content 10.9% by weight).

[Manufacturing Example 7] Preparation of Adhesive (Preparation of Epoxy Adhesive)
Celoxide 2021P (manufactured by Daicel Chemical Industries) 70 parts by weight, EHPE3150 5 parts by weight, Aron Oxetan OXT-221 (manufactured by Toagosei Co., Ltd.) 19 parts by weight, KBM-403 (manufactured by Shin-Etsu Chemical Co., Ltd.) 4 parts by weight, CPI101A (Manufactured by San Afro) was blended in 2 parts by weight to prepare an epoxy adhesive.
[Example 1]
(Preparation of the first optical film A)
An adhesive layer composed of a glass film (manufactured by Nippon Electric Glass Co., Ltd., trade name "OA-10G", thickness: 100 μm) and a polarizing plate A produced in Production Example 1 and an adhesive prepared in Production Example 7. It was pasted together via. At this time, the polarizing plate A was arranged so that the triacetyl cellulose film was on the glass film side. Next, the adhesive layer was irradiated with ultraviolet rays (500 mJ / cm ² ) with a high-pressure mercury lamp to cure the adhesive layer, and a first optical film A was obtained. The adhesive layer had a thickness of 5 μm and an elastic modulus of 1.8 GPa.
(Preparation of the second optical film B)
A pressure-sensitive adhesive layer (manufactured by 3M, trade name "APF V3", thickness: 30 μm) and a polarizing plate B produced in Production Example 2 composed of a pressure-sensitive adhesive prepared in Production Example 6 (manufactured by 3M). They were bonded together via a thickness of 12 μm). At this time, the polarizing plate B was arranged so that the acrylic film was on the reflective polarizer side.

This adhesive layer is formed on the peeled surface of a polyester film (trade name: Diafoil MRF, manufactured by Mitsubishi Resin Co., Ltd.) having a thickness of 38 μm, which is a monomer component prepared in Production Example 6 and one side of which is peeled with silicone. A coating layer was formed by coating so that the final thickness was 12 μm. Next, a polyester film (trade name: Diafoil MRE, manufactured by Mitsubishi Resin Co., Ltd.) having a thickness of 38 μm, one side of which was peeled off with silicone, was applied to the surface of the coated monomer component, and the peeled surface of the film was on the coated layer side. It was coated so as to be. As a result, the coating layer of the monomer component was shielded from oxygen. ^{The sheet having the coating layer thus obtained is subjected to ultraviolet rays having an illuminance of 5 mW / cm 2} (measured by Topcon UVR-T1 having the maximum sensitivity at about 350 nm) using a chemical light lamp (manufactured by Toshiba Corporation). The coating layer was irradiated for 360 seconds to cure the pressure-sensitive adhesive layer to form a pressure-sensitive adhesive layer, and a pressure-sensitive adhesive sheet was prepared. The polyester film coated on both sides of the pressure-sensitive adhesive layer functions as a release film.

Next, the polyester film on one side was peeled off and laminated on the acrylic film side of the second optical film B, and then the other polyester film was peeled off and laminated on the reflective polarizer.
(Manufacturing of liquid crystal panel A for evaluation)
A liquid crystal cell having a liquid crystal layer as a display medium and two transparent substrates sandwiching the liquid crystal layer from both sides was prepared. The liquid crystal cell is 13.3 inches, 298 mm × 170 mm, and the total thickness of the two transparent substrates is 450 μm.

The first optical film A was cut into a size of 296 mm × 168 mm so that the absorption axis direction of the polarizer and the short side were parallel to each other.

The second optical film B was cut into a size of 296 mm × 168 mm so that the absorption axis direction of the polarizer and the long side were parallel to each other.

The first optical film A is placed on one surface of the liquid crystal cell (the surface of one transparent substrate) so that the short sides of the liquid crystal cell and the first optical film A are parallel to each other, and the polarizing plate A is used. The layers were laminated so that the (polarizer) was on the liquid crystal cell side.

The second optical film B is placed on the other surface of the liquid crystal cell (the surface of the other transparent substrate) so that the short sides of the liquid crystal cell and the second optical film A are parallel to each other, and the polarizer is formed. The layers were laminated so as to be on the liquid crystal cell side.

The first optical film A was laminated on the liquid crystal cell via a pressure-sensitive adhesive layer (thickness: 30 μm) composed of the pressure-sensitive adhesive prepared in Production Example 6. The pressure-sensitive adhesive layer was formed as follows. (I) A silicone-treated polyethylene terephthalate film (manufactured by Mitsubishi Chemical Polyester Film Co., Ltd., thickness: 38 μm) was applied and heated at 155 ° C. for 1 minute to form an adhesive layer having a thickness of 20 μm after drying. ii) The pressure-sensitive adhesive layer was transferred from a polyethylene terephthalate film to a polarizing plate A to form a pressure-sensitive adhesive layer.

The second optical film B was laminated on the liquid crystal cell via a pressure-sensitive adhesive layer (thickness: 20 μm) composed of the pressure-sensitive adhesive prepared in Production Example 6. This adhesive layer is formed on the peeled surface of a polyester film (trade name: Diafoil MRF, manufactured by Mitsubishi Resin Co., Ltd.) having a thickness of 38 μm, which is a monomer component prepared in Production Example 6 and one side of which is peeled with silicone. A coating layer was formed by coating so that the final thickness was 100 μm. Next, a polyester film (trade name: Diafoil MRE, manufactured by Mitsubishi Resin Co., Ltd.) having a thickness of 38 μm, one side of which was peeled off with silicone, was applied to the surface of the coated monomer component, and the peeled surface of the film was on the coated layer side. It was coated so as to be. As a result, the coating layer of the monomer component was shielded from oxygen. ^{The sheet having the coating layer thus obtained is subjected to ultraviolet rays having an illuminance of 5 mW / cm 2} (measured by Topcon UVR-T1 having the maximum sensitivity at about 350 nm) using a chemical light lamp (manufactured by Toshiba Corporation). The coating layer was irradiated for 360 seconds to cure the pressure-sensitive adhesive layer to form a pressure-sensitive adhesive layer, and a pressure-sensitive adhesive sheet was prepared. The polyester film coated on both sides of the pressure-sensitive adhesive layer functions as a release film.

Next, the polyester film on one side was peeled off and laminated on the optical film B, and then the other polyester film was peeled off and laminated on the liquid crystal cell.

The evaluation liquid crystal panel A was produced as described above.

[Example 2]
The evaluation liquid crystal panel B was formed in the same manner as in Example 1 except that the first optical film A was produced by using the polarizing plate B produced in Production Example 2 instead of the polarizing plate A produced in Production Example 1. Made.

[Comparative Example 1]
The evaluation liquid crystal panel C was formed in the same manner as in Example 1 except that the first optical film A was produced by using the polarizing plate C produced in Production Example 3 instead of the polarizing plate A produced in Production Example 1. Made.

[Comparative Example 2]
The evaluation liquid crystal panel D was formed in the same manner as in Example 1 except that the first optical film A was produced by using the polarizing plate D produced in Production Example 4 instead of the polarizing plate A produced in Production Example 1. Made.

[Comparative Example 3]
The evaluation liquid crystal panel E was formed in the same manner as in Example 1 except that the first optical film A was produced by using the polarizing plate E produced in Production Example 5 instead of the polarizing plate A produced in Production Example 1. Made.

[Reference example 1]
An evaluation liquid crystal in the same manner as in Example 1 except that the polarizing plate C produced in Production Example 3 was used instead of the polarizing plate A produced in Production Example 1 and the glass film was not attached to the polarizing plate C. Panel F was produced. That is, the evaluation liquid crystal panel F has a configuration in which the glass film is removed from the evaluation liquid crystal panel C according to Comparative Example 1.

(Evaluation)
A heating environment test was carried out on each of the evaluation liquid crystal panels A to F obtained in Examples 1 and 2, Comparative Examples 1 to 3, and Reference Example 1, and then the color change was evaluated.

<Heating environment test>
After the evaluation liquid crystal panels A to F were autoclaved (50 ° C./5 atm / 15 minutes), they were placed in a heating oven at 80 ° C. and taken out 120 hours later.

<Evaluation of color change>
The color change was evaluated for the evaluation liquid crystal panels A to F after the heating environment test was performed under the above conditions.

Specifically, the evaluation liquid crystal panels A to F after the heating environment test were placed on the backlight so that each of the second optical films B was on the lower side. Then, in the undisplayed state (substantially black display), the color change at the edge of each of the visual side surface of the evaluation liquid crystal panels A to F was visually evaluated.

When evaluating the color change, the liquid crystal layer of each of the evaluation liquid crystal panels A to F is in the transmission mode. Further, the de facto black display means that the light transmitted through the polarizing plate on the backlight side passes through the liquid crystal layer as it is, so that the light is completely absorbed by the polarizing plate on the viewing side, resulting in a black display.

The evaluation criteria for color change is x (failure) when the color of the edge of the visible side surface of the evaluation liquid crystal panel is clearly changed compared to the center, and the color of the edge is the center. The case where the color is slightly changed compared to the part but is acceptable when commercialized is evaluated as △ (pass), and the case where the color of the edge is hardly changed compared to the central part is evaluated as 〇 (pass). .. Table 1 shows the evaluation results of the color change along with the configuration of each evaluation liquid crystal panel.

As shown in Table 1, the evaluation result of the tint change of the evaluation liquid crystal panel A according to Example 1 in which the thickness of the polarizer of the first optical film A is 15 μm is Δ, and the polarization of the first optical film A is Δ. The evaluation result of the color change of the evaluation liquid crystal panel B according to Example 2 in which the thickness of the child was 5 μm was 〇. On the other hand, the evaluation result of the color tint change of the evaluation liquid crystal panels C to E according to Comparative Examples 1 to 3 in which the thickness of the polarizer of the first optical film A was larger than 15 μm was x.

From this result, by reducing the thickness of the polarizer of the first optical film A, in the evaluation liquid crystal panel after the heating environment test, the color of the edge portion of the visible side surface changes as compared with the central portion. It can be said that this can be suppressed. In particular, when the thickness of the polarizer of the first optical film A is 15 μm or less, the change in color of the liquid crystal panel can be suppressed. This is because by reducing the thickness of the polarizer of the first optical film A, the heat shrinkage rate of the polarizer after the heating environment test is reduced, and the shrinkage stress applied to the edge of the liquid crystal panel is relaxed. it is conceivable that.

By the way, in the evaluation liquid crystal panel F according to Reference Example 1 in which the first optical film A does not include a glass film, the color of the edge is compared with that of the center even though the thickness of the polarizer is 28 μm. And there was almost no change. According to an additional study by the inventors, when the first optical film A does not include a glass film, regardless of whether the thickness of the polarizer is 15 μm or less (the thickness of the polarizer is determined). (Independently), it was found that the color change at the edge of the liquid crystal panel did not occur.

As described above, the color change at the edge of the liquid crystal panel occurs only in the liquid crystal panel in which the first optical film A includes the glass film, but the thickness of the polarizer of the first optical film A is 15 μm or less. By doing so, it was found that the change in color of the liquid crystal panel can be suppressed.

According to the studies by the inventors, when the total thickness of the two transparent substrates constituting the liquid crystal cell is 450 μm or less, the color of the liquid crystal panel is likely to change. Therefore, in such a liquid crystal cell, it is particularly effective to set the thickness of the polarizer of the first optical film A to 15 μm or less.

Although it may be a problem that the liquid crystal panel is warped by the heating environment test, no problematic warp has occurred in any of the evaluation liquid crystal panels A to F after the heating environment test. ..

According to the studies by the inventors, by setting the thickness of the polarizer of the second optical film B to 10 μm or less, it is possible to suppress the problem that the liquid crystal panel is warped by the heating environment test. Since the thickness of the polarizer of the second optical film B of the evaluation liquid crystal panels A to F was 5 μm, it is considered that the liquid crystal panel did not warp in a heating environment test.

Although the preferred embodiments and the like have been described in detail above, they are not limited to the above-described embodiments and the like, and various modifications and substitutions are made to the above-mentioned embodiments and the like without departing from the scope of claims. Can be added.

This international application claims priority based on Japanese patent application 2019-204932 filed on November 12, 2019, and the entire contents of Japanese patent application 2019-204932 are incorporated into this international application. ..

1 Optical film set 2 Liquid crystal panel 10 First optical film 11 First glass film 12 First adhesive layer 13 First polarizing plate 14 First adhesive layer 20 Second optical film 23 Second polarized light Plate 24 Second adhesive layer 30 Liquid crystal cell 31

Liquid crystal layer

32, 33 Transparent substrate 131 First polarizer 132 First protective film 231 Second polarizing element 232 Second protective film

Claims

A liquid crystal cell having a liquid crystal layer sandwiched between two transparent substrates,
A first optical film provided on the visible side of the liquid crystal cell via a first adhesive layer, and
It has a second optical film provided on the backlight side of the liquid crystal cell via a second pressure-sensitive adhesive layer.
The total thickness of the two transparent substrates is 450 μm or less.
The first optical film includes a glass film and a first polarizing plate.
The thickness of the glass film is 50 μm or more and 150 μm or less.
The first polarizing plate is a liquid crystal panel having a polarizing element having a thickness of 15 μm or less.
The second optical film has a second polarizing plate and has a second polarizing plate.
The liquid crystal panel according to claim 1, wherein the second polarizing plate has a polarizer having a thickness of 10 μm or less.
The liquid crystal panel according to claim 1 or 2, wherein the glass film and the first optical film are laminated via an adhesive layer.
An optical film set used for a liquid crystal cell having a liquid crystal layer sandwiched between two transparent substrates and having a total thickness of 450 μm or less.
A first optical film provided on the visible side of the liquid crystal cell via a first adhesive layer, and
It has a second optical film provided on the backlight side of the liquid crystal cell via a second pressure-sensitive adhesive layer.
The first optical film includes a glass film and a first polarizing plate.
The thickness of the glass film is 50 μm or more and 150 μm or less.
The first polarizing plate is an optical film set having a polarizer having a thickness of 15 μm or less.
The second optical film has a second polarizing plate and has a second polarizing plate.
The optical film set according to claim 4, wherein the second polarizing plate has a polarizer having a thickness of 10 μm or less.