TWI720253B - Polarizing plate set and ips mode liquid crystal display device using the same - Google Patents

Abstract

The present invention provides a polarizing plate set for a specific IPS mode liquid crystal cell capable of securing good visibility even in an environment with strong external light and an IPS mode liquid crystal display device using the same.

The polarizer plate set of the present invention comprises a polarizer plate set for an IPS mode liquid crystal cell having an in-plane retardation value of 100 nm to 200 nm as the viewing side polarizing plate and the back side polarizing plate, wherein the absorption axis of the viewing side polarizing plate and the absorption axis of the back side polarizing plate are orthogonal, a λ/4 plate is disposed between the first polarizer and the liquid crystal cell, the angle between the absorption axis of the viewing side polarizing plate and the slow axis of the λ/4 plate is 45°, a λ/2 plate is disposed between the second polarizer and the liquid crystal cell, the angle between the absorption axis of the back side polarizing plate and the slow axis of the λ/2 plate is 45°, the slow axis of the λ/4 plate and the slow axis of the λ/2 plate are parallel, the Nz coefficient of the λ/4 plate is -0.5 or more and 0.5 or less, the slow axis of the λ/4 plate is arranged in a relationship orthogonal to the initial alignment direction of the liquid crystal cell.

Description

Polarizing plate group and IPS mode liquid crystal display device using the polarizing plate group

The present invention relates to a polarizing plate group and an IPS mode liquid crystal display device using the polarizing plate group.

In recent years, low-power consumption, low-voltage operation, lightweight and thin liquid crystal displays have rapidly spread into information display devices such as mobile phones, portable information terminals, computer screens, and televisions. With the development of liquid crystal technology, various modes of liquid crystal displays have been proposed and the problems of liquid crystal displays with narrow response speed, contrast, and viewing angle have been gradually eliminated.

With mobile phones and portable information terminals, the opportunities for outdoor use increase. In the case of strong external light such as sunlight, the liquid crystal display device with the previous liquid crystal cell and the previous polarizing plate group will appear external light. The reflection is strong and it is not easy to see the problem of the LCD screen.

In terms of countermeasures against this problem, a countermeasure of reducing external light reflection by providing a low-reflection layer on the surface of the viewing side polarizing plate, or using a circular polarizing plate on the viewing side polarizing plate to reduce external light reflection is usually adopted.

However, only with the aforementioned low reflection layer, the visibility will be significantly reduced in an environment where the illuminance of external light exceeds 5000 lux.

In addition, the IPS mode liquid crystal usually has an in-plane retardation value of 250 nm to 380 nm, so it is difficult to arrange the circularly polarizing plate as the viewing side polarizing plate.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] JP 2005-128498 A

The object of the present invention is to provide a polarizing plate group for a specific IPS mode liquid crystal cell and an IPS mode liquid crystal display device using the polarizing plate group, which can ensure good visibility even in an environment where the illuminance of external light exceeds 5000 lux.

In order to achieve the aforementioned object, as the first embodiment, the present invention provides the following [1] to [6].

[1] A polarizing plate group comprising a polarizing plate on the viewing side and a polarizing plate on the back side for bonding to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 100nm to 200nm, the aforementioned viewing side The absorption axis of the polarizing plate is approximately orthogonal to the absorption axis of the back side polarizing plate. The visible side polarizing plate has a first polarizer and a λ/4 plate. The λ/4 plate is arranged on the first polarizer and the liquid crystal. Between the units, between the absorption axis of the visible side polarizer and the slow axis of the λ/4 plate The included angle is approximately 45°, the back-side polarizing plate has a second polarizer and a λ/2 plate, the λ/2 plate is arranged between the second polarizer and the liquid crystal cell, and the absorption axis of the back-side polarizing plate and The angle between the slow axis of the λ/2 plate is approximately 45°, the slow axis of the λ/4 plate is roughly parallel to the slow axis of the λ/2 plate, and the Nz coefficient of the λ/4 plate is -0.5 or more And 0.5 or less, the slow axis system of the λ/4 plate is arranged in a substantially orthogonal relationship to the initial alignment direction of the IPS mode liquid crystal cell.

[2] The polarizing plate set according to [1], wherein the back side polarizing plate includes a positive C plate arranged between the second polarizing plate and the λ/2 plate.

[3] The polarizing plate set according to [1], wherein the back side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/2 plate.

[4] The polarizing plate set according to [2] or [3], wherein the thickness direction of the positive C plate has a retardation value of -150 nm to -250 nm.

[5] An IPS mode liquid crystal display device in which the polarizing plate group described in any one of [1] to [4] is arranged in an IPS mode liquid crystal cell with an in-plane retardation value of 100 nm to 200 nm.

[6] The IPS mode liquid crystal display device according to [5], wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally.

Furthermore, as the second embodiment, the present invention provides the following [7] to [12].

[7] A polarizing plate group comprising a polarizing plate on the visible side and a polarizing plate on the back side for bonding to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 100nm to 200nm, wherein the aforementioned The absorption axis of the viewing side polarizing plate is approximately parallel to the absorption axis of the back side polarizing plate, the viewing side polarizing plate has a first polarizer and a λ/4 plate, and the λ/4 plate is arranged on the first polarizing plate and the liquid crystal Between the units, the angle between the absorption axis of the visible side polarizing plate and the slow axis of the λ/4 plate is approximately 45°, the back side polarizing plate has a second polarizer and a λ/2 plate, and the λ/2 plate Arranged between the second polarizer and the liquid crystal cell, the angle between the absorption axis of the back-side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, and the slow axis of the λ/4 plate is approximately 45° The slow axis of the λ/2 plate is roughly orthogonal, the Nz coefficient of the λ/4 plate is -0.5 or more and 0.5 or less, and the slow axis of the λ/4 plate is arranged so that the initial alignment direction of the IPS mode liquid crystal cell is Roughly orthogonal.

[8] The polarizing plate set according to [7], wherein the back side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/2 plate.

[9] The polarizing plate set according to [7], wherein the back side polarizing plate includes a positive C plate arranged between the polarizing plate and the λ/2 plate.

[10] The polarizing plate set according to [8] or [9], wherein the thickness of the positive C plate is The retardation value in the degree direction is -50nm to -150nm.

[11] An IPS mode liquid crystal display device in which the polarizing plate group described in any one of [7] to [10] is arranged in an IPS mode liquid crystal cell with an in-plane retardation value of 100 nm to 200 nm.

[12] The IPS mode liquid crystal display device according to [11], wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally.

Furthermore, as the third embodiment, the present invention provides the following [13] to [18].

[13] A polarizing plate group comprising a polarizing plate on the visible side and a polarizing plate on the back side, which are used to be respectively attached to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 100nm to 200nm, wherein, the aforementioned The absorption axis of the viewing side polarizing plate is approximately parallel to the absorption axis of the back side polarizing plate, the viewing side polarizing plate has a first polarizer and a λ/4 plate, and the λ/4 plate is arranged on the first polarizing plate and the liquid crystal Between the units, the angle between the absorption axis of the visible side polarizing plate and the slow axis of the λ/4 plate is approximately 45°, the back side polarizing plate has a second polarizer and a λ/2 plate, and the λ/2 plate Arranged between the second polarizer and the liquid crystal cell, the angle between the absorption axis of the back-side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, and the slow axis of the λ/4 plate is approximately 45° The slow axis of the λ/2 plate is roughly orthogonal, The Nz coefficient of the λ/2 plate is -0.5 or more and 0.5 or less, and the slow axis system of the λ/4 plate is arranged in a substantially orthogonal relationship to the initial alignment direction of the IPS mode liquid crystal cell.

[14] The polarizing plate set according to [13], wherein the viewing-side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/4 plate.

[15] The polarizing plate set according to [13], wherein the viewing-side polarizing plate includes a positive C plate arranged between the polarizing plate and the λ/4 plate.

[16] The polarizing plate set according to [14] or [15], wherein the thickness direction of the positive C plate has a retardation value of -50 nm to -150 nm.

[17] An IPS mode liquid crystal display device in which the polarizing plate group described in any one of [13] to [16] is arranged in an IPS mode liquid crystal cell with an in-plane retardation value of 100 nm to 200 nm.

[18] The IPS mode liquid crystal display device according to [17], wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally.

Furthermore, as the fourth embodiment, the present invention provides the following [19] to [24].

[19] A polarizing plate group comprising a viewing side polarizing plate and a back side polarizing plate for bonding to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 400nm to 500nm, wherein, the aforementioned The absorption axis of the viewing side polarizing plate is approximately orthogonal to the absorption axis of the back side polarizing plate. The viewing side polarizing plate has a first polarizer and a λ/4 plate. The λ/4 plate is arranged on the first polarizer and the Between the liquid crystal cells, The angle between the absorption axis of the visible side polarizing plate and the slow axis of the λ/4 plate is approximately 45°, the back side polarizing plate has a second polarizer and a λ/2 plate, and the λ/2 plate is arranged on the first 2 Between the polarizer and the liquid crystal cell, the angle between the absorption axis of the back-side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, and the slow axis of the λ/4 plate and the λ/2 plate The slow axis of the λ/4 plate is roughly parallel, the Nz coefficient of the λ/4 plate is -0.5 or more and 0.5 or less, and the slow axis of the λ/4 plate is arranged so that the IPS mode is roughly parallel to the initial alignment direction of the liquid crystal cell.

[20] The polarizing plate set according to [19], wherein the back side polarizing plate includes a positive C plate arranged between the second polarizing plate and the λ/2 plate.

[21] The polarizing plate set according to [19], wherein the back side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/2 plate.

[22] The polarizing plate set according to [20] or [21], wherein the thickness direction of the positive C plate has a retardation value of -150 nm to -250 nm.

[23] An IPS mode liquid crystal display device in which the polarizing plate group described in any one of [19] to [22] is arranged in an IPS mode liquid crystal cell with an in-plane phase difference of 400 nm to 500 nm.

[24] The IPS mode liquid crystal display device according to [23], wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally.

Furthermore, as the fifth embodiment, the present invention provides the following [25] to [29].

[25] A polarizing plate group comprising a polarizing plate on the visible side and a polarizing plate on the back side for bonding to both sides of an IPS mode liquid crystal cell with an in-plane phase difference of 400nm to 500nm, wherein the aforementioned The absorption axis of the viewing side polarizing plate is approximately orthogonal to the absorption axis of the back side polarizing plate. The viewing side polarizing plate has a first polarizer and a λ/4 plate. The λ/4 plate is arranged on the first polarizer and the Between the liquid crystal cells, the angle between the absorption axis of the visible side polarizing plate and the slow axis of the λ/4 plate is approximately 45°, and the back side polarizing plate has a second polarizer, a λ/2 plate, and a positive C plate, The λ/2 plate is arranged between the second polarizer and the liquid crystal cell, the angle between the absorption axis of the back side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, and the thickness of the positive C plate The phase difference in the direction is -50nm to -150nm, the slow axis of the λ/4 plate is roughly parallel to the slow axis of the λ/2 plate, and the Nz coefficient of the λ/4 plate is -0.5 or more and 0.5 or less, The slow axis system of the aforementioned λ/4 plate is arranged so that the IPS mode is substantially parallel to the initial alignment direction of the liquid crystal cell.

[26] The polarizing plate set according to [25], wherein the positive C plate is arranged between the second polarizer and the λ/2 plate.

[27] The polarizing plate set according to [25], wherein the positive C plate is arranged on the front Between the liquid crystal cell and the aforementioned λ/2 plate.

[28] An IPS mode liquid crystal display device in which the polarizing plate group described in any one of [25] to [27] is arranged in an IPS mode liquid crystal cell with an in-plane retardation value of 400 nm to 500 nm.

[29] The IPS mode liquid crystal display device according to [28], wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally.

Furthermore, as the sixth embodiment, the present invention provides the following [30] to [34].

[30] A polarizing plate group comprising a polarizing plate on the visible side and a polarizing plate on the back side for bonding to both sides of an IPS mode liquid crystal cell with an in-plane phase difference of 400nm to 500nm, wherein the aforementioned The absorption axis of the viewing side polarizing plate is approximately orthogonal to the absorption axis of the back side polarizing plate. The viewing side polarizing plate has a first polarizer, a λ/4 plate, and a positive C plate. The λ/4 plate is arranged on the first Between the polarizer and the liquid crystal cell, the angle between the absorption axis of the visible side polarizer and the slow axis of the λ/4 plate is approximately 45°, and the back side polarizer has a second polarizer and a λ/2 plate, The λ/2 plate is arranged between the second polarizer and the liquid crystal cell, the angle between the absorption axis of the back side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, and the thickness of the positive C plate The phase difference of the direction is -50nm to -150nm, the slow axis of the λ/4 plate is roughly parallel to the slow axis of the λ/2 plate, the Nz coefficient of the λ/2 plate is -0.5 or more and 0.5 or less, the slow axis of the λ/4 plate The system is arranged in a substantially parallel relationship with the initial alignment direction of the IPS mode liquid crystal cell.

[31] The polarizing plate set according to [30], wherein the positive C plate is arranged between the first polarizer and the λ/4 plate.

[32] The polarizing plate set according to [30], wherein the positive C plate is arranged between the liquid crystal cell and the λ/4 plate.

[33] An IPS mode liquid crystal display device in which the polarizing plate group described in any one of [30] to [32] is arranged in an IPS mode liquid crystal cell with an in-plane phase difference of 400 nm to 500 nm.

[34] The IPS mode liquid crystal display device according to [33], wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally.

When the polarizing plate assembly of the present invention is used, it is possible to provide a liquid crystal display device that can suppress the reflection of external light and can ensure good visibility even in an environment with strong external light such as outdoors.

1: The absorption axis of the polarizer

2: Slow axis of λ/4 plate

3: The initial alignment direction of the liquid crystal cell

4: λ/2 slow phase axis

5: The absorption axis of the polarizer

10: Visual recognition side polarizer

20: Polarizing plate on the back side

30, 50: Polarizing plate

31a, 31b, 51a, 51b: protective film

32: The first polarizer

36: Surface treatment layer

34, 54: positive C plate

35:λ/4 plate

52: 2nd polarizer

55: λ/2 plate

61: Brightness enhancement film

60: LCD unit

Fig. 1 (a) and (b) are schematic cross-sectional views showing examples of preferable layer structures of the polarizing plate groups of Embodiments 1, 2, 4, and 5 of the present invention.

Fig. 2 (a) and (b) are schematic diagrams showing examples of a preferable axis configuration of the IPS liquid crystal display device according to the first embodiment of the present invention.

Fig. 3 (a) and (b) are schematic diagrams showing examples of a preferable axis configuration of the IPS liquid crystal display device of the second embodiment of the present invention.

Fig. 4 (a) and (b) are schematic cross-sectional views showing examples of preferable layer structures of the polarizing plate assembly of the third and sixth embodiments of the present invention.

Fig. 5 (a) and (b) are schematic diagrams showing examples of a preferable axis configuration of the IPS liquid crystal display device of the third embodiment of the present invention.

Fig. 6 (a) and (b) are schematic diagrams showing examples of preferable axis configurations of the IPS liquid crystal display device of the fourth and fifth embodiments of the present invention.

Figs. 7 (a) and (b) are schematic diagrams showing examples of a preferable axis configuration of the IPS liquid crystal display device of the sixth embodiment of the present invention.

Hereinafter, the polarizing plate group of the present invention and the liquid crystal panel using the polarizing plate group will be described using appropriate drawings, but the present invention is not limited by these embodiments.

Figure 1 (a) to (b) are schematic cross-sectional views showing examples of preferred layer structures of the polarizing plates of Embodiments 1, 2, 4, and 5 of the present invention. The polarizing plates of Embodiments 1, 2, 4, and 5 of the present invention will be described with reference to Fig. 1 (a) to (b). The polarizing plate set shown in Fig. 1 (a) to (b) includes: a λ/4 plate 35 layered on an area of the polarizing plate 30 as the viewing side polarizing plate 10; and a polarizing plate layered on an area of the polarizing plate 50. The C plate 54 and the λ/2 plate 55 are formed by layering the brightness enhancement film 61 on the other area of the polarizing plate 50 as the back side polarizing plate 20.

Figures 4 (a) to (b) are schematic cross-sectional views showing examples of preferred layer structures of the polarizing plates of Embodiments 3 and 6 of the present invention. The polarizing plates of Embodiments 3 and 6 of the present invention will be described with reference to Figs. 4 (a) to (b). The polarizing plate set shown in Fig. 4 (a) to (b) includes: a λ/4 plate 35 and a positive C plate 34 layered on one area of the polarizing plate 30 as the viewing side polarizing plate 10; and, the polarizing plate The λ/2 plate 55 is layered on one area of 50 and the brightness enhancement film 61 is layered on the other area of the polarizing plate 50 as the back side polarizing plate 20.

[Various components constituting the viewing side polarizing plate and the back side polarizing plate]

The viewing side polarizing plate and the back side polarizing plate of the present invention include a polarizing plate 30 and a polarizing plate 50.

[Polarizer]

The first polarizer 32 and the second polarizer 52 are usually manufactured through the following steps: a step of uniaxially stretching the polyvinyl alcohol-based resin film; and dyeing the polyvinyl alcohol-based resin film with a dichroic dye The step of adsorbing the dichroic pigment; the step of treating the polyvinyl alcohol resin film after the adsorption of the dichroic pigment with an aqueous solution of boric acid; and the step of washing with water after the treatment with the aqueous solution of boric acid.

As the polyvinyl alcohol resin, a polyvinyl acetate resin saponified can be used. In addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, polyvinyl acetate resins include copolymers with other monomers that can be copolymerized with vinyl acetate. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.

The saponification degree of polyvinyl alcohol resin is usually 85 to 100 About mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may also be modified. For example, polyvinyl methyl acetal and polyvinyl acetal modified with aldehydes can also be used. In addition, the degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.

A film formed of such a polyvinyl alcohol-based resin can be used as a blank film of the first polarizer 32 and the second polarizer 52. The method of forming a polyvinyl alcohol-based resin into a film is not particularly limited, and a well-known method can be used to form the film. The film thickness of the polyvinyl alcohol-based green film is not particularly limited, and for example, it is about 10 μm to 150 μm.

The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before the dyeing of the dichroic dye, simultaneously with the dyeing, or after the dyeing. When uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before or during the boric acid treatment. Moreover, it is also possible to perform uniaxial extension in these plural stages.

In uniaxial stretching, uniaxial stretching can be performed between rollers with different peripheral speeds, or a heated roll can be used for uniaxial stretching. In addition, the uniaxial stretching may be dry stretching in the atmosphere, or wet stretching in a state where the polyvinyl alcohol-based resin film is swollen using a solvent. The stretching ratio is usually about 3 to 8 times.

As a method of dyeing a polyvinyl alcohol-based resin film using a dichroic dye, for example, a method of immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye is used. As the dichroic dye, specifically, iodine and dichroic dye are used. In addition, the polyvinyl alcohol-based resin film is preferably immersed in water before the dyeing treatment.

When iodine is used as a dichroic dye, a method of dyeing by immersing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually adopted. The iodine content in the aqueous solution is usually about 0.01 to 1 part by weight per 100 parts by weight of water. In addition, the potassium iodide content is usually about 0.5 to 20 parts by weight per 100 parts by weight of water. The temperature of the aqueous solution used in dyeing is usually about 20 to 40°C.

In addition, the immersion time (dyeing time) in the aqueous solution is usually about 20 to 1,800 seconds.

On the other hand, when a dichroic dye is used as a dichroic dye, a method of dyeing by immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic dye is usually adopted. The content of the dichroic dye in the aqueous solution is usually about 1×10 ^-4 to 10 parts by weight per 100 parts by weight of water, preferably about 1×10 ^-3 to 1 part by weight. The aqueous solution may also contain inorganic salts such as sodium sulfate as a dyeing auxiliary. The temperature of the dichroic dye aqueous solution used in dyeing is usually about 20 to 80°C. In addition, the immersion time (dyeing time) in the aqueous solution is usually about 10 to 1,800 seconds.

The boric acid treatment after dyeing with a dichroic dye can usually be performed by immersing the dyed polyvinyl alcohol-based resin film in an aqueous solution containing boric acid.

The amount of boric acid in the boric acid-containing aqueous solution is usually about 2 to 15 parts by weight per 100 parts by weight of water, preferably 5 to 12 parts by weight. When iodine is used as the dichroic dye, the aqueous solution containing boric acid preferably contains potassium iodide. The amount of potassium iodide in the boric acid-containing aqueous solution is usually about 0.1 to 15 parts by weight per 100 parts by weight of water, preferably about 5 to 12 parts by weight. The immersion time in the boric acid-containing aqueous solution is usually about 60 to 1,200 seconds, preferably about 150 to 600 seconds, and more preferably about 200 to 400 seconds. The temperature of the boric acid-containing aqueous solution is usually 50°C or higher, preferably 50 to 85°C, and more preferably 60 to 80°C.

The polyvinyl alcohol-based resin film after the boric acid treatment is usually washed with water. The water washing treatment system can be performed, for example, by immersing the polyvinyl alcohol-based resin film treated with boric acid in water. The temperature of the water to be washed is usually about 5 to 40°C. In addition, the immersion time is usually about 1 to 120 seconds.

After washing with water, a drying process is performed, and the first polarizer 32 and the second polarizer 52 can be obtained.

The drying process can be performed using a hot air dryer and a far-infrared heater. The temperature of the drying treatment is usually about 30 to 100°C, preferably 50 to 80°C. The drying treatment time is usually about 60 to 600 seconds, preferably 120 to 600 seconds.

By the drying process, the moisture content of the first polarizer 32 and the second polarizer 52 can be reduced to a practical level. The moisture content is usually 5 to 20% by weight, preferably 8 to 15% by weight. When the moisture content is less than 5% by weight, the flexibility of the first polarizer 32 and the second polarizer 52 is lost, and the first polarizer 32 and the second polarizer 52 may be damaged or broken after drying. In addition, when the moisture content exceeds 20% by weight, the thermal stability of the first polarizer 32 and the second polarizer 52 may deteriorate.

As described above, it is possible to manufacture a polarizer in which a dichroic dye is adsorbed and aligned on a polyvinyl alcohol resin film.

In addition, the stretching, dyeing, boric acid treatment, water washing step, and drying step of the polyvinyl alcohol-based resin film in the manufacturing step of the polarizer can be performed, for example, according to the method described in JP 2012-159778 A. As the method described in this document, it is also useful to form a polyvinyl alcohol-based resin layer as a polarizer by coating a polyvinyl alcohol-based resin on a base film.

In order to suppress the shrinkage force of the polarizer in a high-temperature environment, the thickness of the polarizer is preferably 15 μm or less, and more preferably 12 μm or less. From the viewpoint of imparting good optical characteristics, the thickness of the polarizer is usually 3 μm or more.

By using a polarizer whose shrinkage force is suppressed in a high-temperature environment, it is also possible to suppress the phase difference change caused by the skew of the λ/2 plate and the λ/4 plate accompanying the shrinkage of the polarizer. When used in a liquid crystal display device It can be a polarizing plate with small display unevenness.

When kept at a temperature of 80°C for 240 minutes, the shrinkage force per 2mm of the width in the absorption axis direction of the polarizer is preferably 2N/2mm or less. When the shrinkage force exceeds 2N/2mm, the dimensional change in a high temperature environment will increase and the shrinkage force of the polarizer will increase. Therefore, the λ/2 plate and the λ/4 plate are prone to skew, which may cause cracks in the polarizer. tendency. When the stretching ratio is lowered, and when the thickness of the polarizer is reduced, the shrinkage force of the polarizer tends to be 2N/2mm or less. The method of measuring the contraction force is in accordance with the method of the examples described later.

Preferably, a protective film is layered on at least one area of the polarizer, and a protective film may also be provided on both sides. The protective films 31a, 31b, 51a, and 51b can be composed of a transparent resin film. In particular, it is better to be composed of materials with excellent transparency, mechanical strength, thermal stability, and moisture shielding properties. In this specification, the so-called transparent resin film refers to a resin film whose monomer transmittance in the visible light region is 80% or more.

For the film formation of the polarizing plate, it is also effective to omit the protective films 31b and 51b by making the positive C plate 34, the positive C plate 54, the λ/4 plate 35, and the λ/2 plate 55 function as protective films. means. Also, in the same way, in order to make the polarizing plate into a film, it is also effective to omit the protective film 51a by making the brightness enhancement film 61 function as a protective film.

As the protective films 31a, 31b, 51a, 51b, cellulose resins, chain polyolefin resins, cyclic polyolefin resins, acrylic resins, polyimide resins, and polycarbonate resins can be used. , Polyester resins, etc. in this field are widely used as protective film forming materials used to form films.

These resins can also be formulated with appropriate additives within a range that does not impair transparency.

Examples of additives include antioxidants, ultraviolet absorbers, antistatic agents, slip agents, nucleating agents, antifogging agents, anti-blocking agents, retardation reducing agents, stabilizers, processing aids, and plasticizers. , Impact resistant additives, matting agents, antibacterial agents, antifungal agents, etc. A plurality of these additives can be used in combination.

As a method of forming a film from a resin film as described above, any optimal method may be appropriately selected. For example, it is possible to use a solvent casting method in which a resin dissolved in a solvent is cast on a metal strip or drum, and the solvent is dried and removed to obtain a film; and by heating the resin to a temperature above its melting temperature, the method can be used. Melt extrusion method for kneading, extruding from a die, and cooling to obtain a film, etc. In the melt extrusion method, it can extrude a single layer film, and can also extrude a multi-layer film at the same time.

In addition, in order to improve the visibility when viewing the screen through polarized sunglasses, a retardation plate obtained by stretching the aforementioned film may be used for the protective film 31a. From the viewpoint of improving visibility, it is preferable to arrange it so that the angle between the slow axis of the λ/4 plate as the retardation plate and the absorption axis of the polarizing film becomes approximately 45°. In addition, when laminated with a long strip of polarizing film, it is preferable to use a roll to roll method to extend the angle to the long side direction of the strip to approximately 45° or 135° to manufacture the polarizing plate. .

[Surface Treatment Layer 36 of Protective Film 31a]

The protective film 31a may have a surface treatment layer 36 on the surface opposite to the surface to which the first polarizer 32 is bonded. As the surface treatment layer 36, for example, a hard coat layer having a fine surface concavity and convexity is exemplified. The hard coating is better for its pencil hardness to be harder than H. Its pencil hardness is H or less, and it is easy to cause damage on the surface, and the visibility with the liquid crystal display device deteriorates when it is damaged. The pencil hardness is determined in accordance with JIS K 5600-5-4: 1999 "General Test Methods for Paints-Part 5: Mechanical Properties of Coating Films-Section 4: Scratch Hardness (Pencil Method)", and each hardness is used When the pencil is scratched, it is the hardest pencil hardness that will not cause damage.

The protective film 31a having the surface treatment layer 36 preferably has a haze value in the range of 0.1 to 45%, and further preferably in the range of 5 to 40%. When the haze value is greater than 45%, although the reflection of external light can be reduced, the density of the black display screen is reduced. In addition, when the haze value is less than 0.1%, it is not good because a sufficient anti-glare performance cannot be obtained and external light is reflected on the screen. Here, the haze value is calculated in accordance with JIS K 7136: 2000 "Method for Obtaining the Haze of Plastic-Transparent Materials".

A hard coat with fine surface irregularities can be formed by forming a coating film containing organic or inorganic particles on the surface of a resin film; after forming a coating film with or without organic or inorganic particles, press it on A method of attaching a roller with a concave and convex shape; for example, it can be formed using an embossing method or the like. Such a coating film can be formed, for example, by applying a coating solution (curable resin composition) containing a binder component composed of a curable resin and organic or inorganic particles on the surface of the resin film. .

The protective film 31a is not only applied with the aforementioned anti-glare treatment (haze imparting treatment) which also serves as a hard coat, but also may be subjected to various additional surface treatments such as anti-reflection layer, antistatic treatment, antifouling treatment, or antibacterial treatment. , Can also form a coating layer containing liquid crystal compounds and their high molecular weight compounds. In particular, when forming an anti-reflection layer with a reflectance of 3% or less, it can be suitably used without impairing visibility even if it is 10,000 Lux or more. In addition, in addition to surface treatment, the antistatic function can also be imparted to other parts of the polarizing plate such as a pressure-sensitive adhesive layer.

[Protective film 31b, 51b]

As the protective films 31b and 51b, since the hysteresis value is easy to control and easy to obtain, cellulose resin or cyclic polyolefin resin is preferable.

The cellulose resin may be an organic acid ester or a mixed organic acid ester of cellulose in which part or all of the hydrogen atoms in the hydroxyl groups of the cellulose are substituted with acetyl, acryl, and/or butyryl groups. Examples include cellulose acetate, propionate, butyrate, and those composed of mixed esters. Especially cellulose triacetate, cellulose diacetate, cellulose acetate propionate, cellulose acetate butyrate and the like are preferred.

The cyclic polyolefin resin is obtained by polymerizing, for example, cyclic olefin monomers such as norbornene and other cyclopentadiene derivatives in the presence of a catalyst. When such a cyclic polyolefin resin is used, it is easy to obtain a protective film having a predetermined hysteresis value described later.

Examples of cyclic polyolefin-based resins include norcamene or its derivatives obtained by Diels-Alder reaction from cyclopentadiene and olefins or (meth)acrylic acid or its esters as The monomer undergoes ring-opening metathesis polymerization, followed by hydrogenation to obtain the resin; from dicyclopentadiene and olefins or (meth)acrylic acid or its esters, the tetracyclic ring obtained by the Diels-Alder reaction Dodecene or its derivatives are used as monomers to undergo ring-opening metathesis polymerization, followed by hydrogenation to obtain resins; will be selected from norbornene, tetracyclododecene, these derivatives, and other cyclic olefins At least two monomers of the monomers are similarly subjected to ring-opening metathesis copolymerization, followed by hydrogenation to obtain resins; and cyclic olefins such as norbornene, tetracyclododecene, or their derivatives are combined with A resin obtained by addition copolymerization of an aromatic compound having a chain olefin and/or a vinyl group.

As a method of forming a film from the above-mentioned resin film, an arbitrary optimal method may be appropriately selected. For example, it is possible to use a solvent casting method in which a resin dissolved in a solvent is cast on a metal strip or drum and the solvent is dried and removed to obtain a film; and the resin is heated to above its melting temperature, kneaded and removed from the mold Extrusion, cooling to obtain the melt extrusion method of the film, etc. In the melt extrusion method, a single-layer film can be extruded and a multi-layer film can be extruded at the same time.

In order to suppress the decrease in the degree of polarization caused by the removal of polarization of the protective films 31b and 51b, the retardation value Rth in the thickness direction is preferably 10 nm or less. The retardation value Rth in the thickness direction is a value obtained by subtracting the refractive index in the thickness direction from the average refractive index in the plane, multiplied by the film thickness, and is defined by the following formula (a). In addition, the in-plane retardation value Re is preferably 10 nm or less. The in-plane retardation value Re is a value obtained by multiplying the in-plane refractive index difference by the film thickness, and is defined by the following formula (b).

Rth=[(n _x +n _y )/2-n _z ]×d (a)

Re=(n _x -n _y )×d (b)

In the formula, n _x is the refractive index in the x-axis direction (in-plane slow axis direction) in the _{film plane, and n y} is the y-axis direction in the film plane (in-plane advancing axis direction, which is positive to the x-axis in the plane The refractive index in the cross direction), n _z is the refractive index in the z-axis direction (thickness direction) perpendicular to the film surface, and d is the film thickness.

Here, the retardation value may be a value of any wavelength in the range of about 500 to 650 nm near the center of the visible light, but in this specification, the retardation value at a wavelength of 590 nm is set as a standard. The thickness direction retardation value Rth and the in-plane retardation value Re can be measured using various commercially available retardation meters.

As a method of controlling the retardation value Rth of the resin film in the plane and the thickness direction within a range of 10 nm or less, there is a method of minimizing the skew remaining in the plane and the thickness direction when the film is manufactured. For example, in the above-mentioned solvent casting method, a method in which the residual shrinkage strain in the plane and the thickness direction generated when the casting resin solution is dried can be relieved by heat treatment. On the other hand, in the above-mentioned melt extrusion method, in order to prevent the resin film from being stretched from the die to the cooling, the distance from the die to the cooling drum can be shortened as much as possible, and the film can be prevented from being stretched. The method of controlling the amount of extrusion and the rotation speed of the cooling drum, etc. Moreover, similarly to the solvent casting method, it is also possible to adopt a method of alleviating the strain remaining in the obtained film by heat treatment.

[λ/2 plate 55]

In Embodiments 1 to 5 of the present invention, the λ/2 plate 55 is preferably composed of materials having excellent transparency, mechanical strength, thermal stability, moisture shielding properties, and the like. For example, polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.), cyclic polyolefin resins (norbornene resins, etc.); such as cellulose triacetate, cellulose Cellulose resins such as cellulose ester resins of diacetate; polyester resins; polycarbonate resins; (meth)acrylic resins; polystyrene resins; liquid crystal compositions; or mixtures of these, Copolymers and so on. Among them, since a film containing a polycarbonate resin and a liquid crystal composition has positive wavelength dispersibility, it is suitable for use.

Here, the term “positive wavelength dispersion” means that the following formula (c) is satisfied. The number in () is the measurement wavelength (unit: nm) of the retardation value.

Re(450)>Re(590)>Re(650) (c)

In addition, the retardation value of the λ/2 plate 55 in the present invention means that the retardation value Re at the measurement wavelength of 590 nm is 200 nm to 300 nm. In the present invention, the Nz coefficient defined by the following formula (d) of the λ/2 plate 55 is preferably in the range of 0.8 to 1.2. More preferably, it is the range of 0.95 to 1.05.

Nz=Re/Rth+0.5 (d)

The λ/2 plate is in the range that does not damage the transparency, and appropriate additives can also be deployed. Examples of additives include antioxidants, ultraviolet absorbers, antistatic agents, slip agents, nucleating agents, anti-fogging agents, anti-blocking agents, retardation reducing agents, stabilizers, processing aids, and plasticizing agents. Agents, impact resistant additives, matting agents, antibacterial agents, antifungal agents, etc. A plurality of these additives can be used in combination.

The term polycarbonate resin refers to aromatic polycarbonate. Polycarbonate resins can be obtained by, for example, the following methods: a method of reacting a dihydric phenol with a carbonate precursor by an interfacial polycondensation method or a melt transesterification method; and a solid phase transesterification method for prepolymerizing the carbonate ester The method of polymer polymerization; and the method of polymerizing cyclic carbonate compound by ring-opening polymerization method, etc.

As a dihydric phenol, it is selected from bisphenol A, 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane, 2,2-bis(4-hydroxyphenyl)butane , 2,2-bis(4-hydroxyphenyl)-3-methylbutane, 2,2-bis(4-hydroxyphenyl)-3,3-dimethylbutane, 2,2-bis( 4-hydroxyphenyl)-4-methylpentane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and α,α'-bis(4-hydroxy Phenyl)-m-diisopropylbenzene is preferably a homopolymer or copolymer obtained from at least one dihydric phenol, and it is particularly suitable to use a homopolymer of bisphenol A and 1,1 -Bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and selected from bisphenol A, 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane and α,α'-Bis(4-hydroxyphenyl)-m-diisopropylbenzene is a copolymer of at least one dihydric phenol.

As the aforementioned carbonate precursor, carbonyl halide, carbonate, haloformate, etc. can be used. Specifically, phosgene, diphenyl carbonate, or dihaloformate of dihydric phenol can be used.

As a method of forming a film from the above-mentioned resin film, any optimal method may be appropriately selected. For example, the following methods can be used: a solvent casting method in which a resin dissolved in a solvent is cast onto a metal strip or drum, and the solvent is dried and removed to obtain a film; by heating the resin to a temperature above its melting temperature and mixing Refining, extruding from a die, and cooling to obtain a melt extrusion method. In the melt extrusion method, a single layer film can be extruded, and a multi-layer film can be extruded at the same time.

In order to give a predetermined retardation value to the film formed in this way, it is preferable to perform a stretching process. The extension can adopt any optimal extension method such as uniaxial extension/sequential biaxial extension/simultaneous biaxial extension.

The liquid crystal composition preferably has a nematic phase (nematic liquid crystal) in its liquid crystal phase. The mechanism for expressing the liquid crystallinity of the liquid crystal material may be soluble or thermotropic. The alignment state of the liquid crystal material is preferably horizontal alignment. As the liquid crystal material, for example, a liquid crystal polymer and a liquid crystal monomer can be used. The liquid crystal polymer and the liquid crystal monosystem can be used alone or in combination of two or more kinds.

When the present invention is used as a λ/2 plate, it is preferably a hardened layer of a liquid crystal composition. Specifically, when the liquid crystal composition contains a liquid crystal monomer, the liquid crystal single system preferably contains a polymerizable monomer and/or a crosslinkable monomer. By polymerizing or crosslinking the liquid crystal monomer, the alignment state of the liquid crystal monomer can be fixed. After the liquid crystal monomers are aligned, for example, when the liquid crystal monomers are polymerized or crosslinked with each other, the alignment state can be fixed by this. Here, a polymer is formed by polymerization and a three-dimensional network structure is formed by crosslinking, but these are non-liquid crystallinity. Therefore, the formed retardation layer will not transition to a liquid crystal phase, a glass phase, or a crystal phase due to, for example, a temperature change peculiar to a liquid crystal compound. As a result, the retardation layer is not affected by temperature changes and can be a layer having very excellent stability.

Examples of the liquid crystal monomers include BASF's trade name LC242, Merck's trade name E7, and Wacker-Chem's trade name LC-Sillicon-CC3767. These liquid crystal monosystems can be used alone or in combination of two or more kinds.

The temperature range in which the above-mentioned liquid crystal monomer exhibits liquid crystallinity differs according to its kind. Specifically, the temperature range is preferably 40 to 120°C, more preferably 50 to 100°C, and most preferably 60 to 90°C.

The liquid crystal hardened layer can be set in such a way that the best function as a λ/2 plate can be obtained. In other words, the thickness can be set in such a way that the required optical characteristics can be obtained. The thickness of the retardation layer is preferably 0.5 to 10 μm, more preferably 0.5 to 8 μm, particularly preferably 0.5 to 5 μm.

As a method of manufacturing a film exhibiting optical anisotropy by coating and alignment of the liquid crystal composition, any appropriate method can be adopted. For example, an alignment treatment is performed on the surface of a base film such as a polyethylene terephthalate film, and the coating liquid containing the liquid crystal composition is applied to the surface to form a liquid crystal cured layer. The coating liquid may also contain a polymerization initiator, a crosslinking agent, a surfactant, a solvent, and the like. As the alignment processing, any appropriate alignment processing can be adopted. Specifically, mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment can be cited.

Specific examples of mechanical alignment treatment include rubbing treatment and stretching treatment. Specific examples of physical alignment treatment include magnetic field alignment treatment and electric field alignment treatment. As specific examples of the chemical alignment treatment, oblique vapor deposition and photo-alignment treatment can be cited. It is preferably a rubbing treatment. The alignment treatment can be performed directly on the surface of the substrate film, or any appropriate alignment film (as a representative of the silane coupling agent layer, polyvinyl alcohol layer or polyimide layer) can be formed on the substrate film, and the alignment film Implement. When performing rubbing treatment, it is better to apply it directly on the surface of the substrate film.

The alignment direction of the above-mentioned alignment process can be set according to the above-mentioned required angle. By performing the alignment treatment, since the liquid crystal material can be aligned in accordance with the alignment direction of the base film, the slow axis of the formed liquid crystal hardened layer is substantially the same as the alignment direction of the base film. Therefore, for example, when the second polarizer 52 (long strip) has an absorption axis in its longitudinal direction, the alignment treatment is performed in the direction in which the angle of the substrate (long strip) in the longitudinal direction is approximately 45° or approximately 135°. . By forming the liquid crystal hardened layer in this manner, the second polarizer 52 (polarizing plate) and the λ/2 plate 55 can be continuously laminated in a roll-to-roll manner. As a result, the manufacturing steps can be significantly shortened.

[λ/4 plate 35]

In Embodiments 1, 2, 4, and 5 of the present invention, the λ/4 plate 35 is particularly preferably composed of materials having excellent transparency, mechanical strength, thermal stability, moisture shielding properties, and the like. As the material of the λ/4 plate 35, it can also be made of the resin that forms the aforementioned protective film, but it is preferable to use a styrene-based material. Styrene-based materials are preferable from the viewpoint of satisfying the relational expression of refractive index nz>nx≧ny, but because of their fragility, they are not suitable for independent use. Therefore, in the present invention, a phase difference film composed of a three-layer structure in which a surface layer including a (meth)acrylic resin composition containing rubber particles is formed on both sides of a core layer containing a styrene-based resin is used as good. In addition, the aforementioned retardation film is also preferable because it has positive wavelength dispersion.

In the present invention, the retardation value of the λ/4 plate 35 means that the retardation value Re at the measurement wavelength of 590 nm is 120 nm to 160 nm. _{In addition, the N z} coefficient defined by the following formula (d) is in the range of -0.5 to 0.5, preferably in the range of -0.2 to 0.2.

N _z =(n _x -n _z )/(n _x -n _y )=Re/Rth+0.5 (d)

The λ/4 plate 35 can also be equipped with appropriate additives within a range that does not impair transparency. Examples of additives include antioxidants, ultraviolet absorbers, antistatic agents, slip agents, nucleating agents, anti-fogging agents, anti-blocking agents, retardation reducing agents, stabilizers, processing aids, and plasticizing agents. Agents, impact resistant additives, matting agents, antibacterial agents, antifungal agents, etc. A plurality of these additives can be used in combination.

In addition to the homopolymer of styrene or its derivatives, the styrene resin that constitutes the core layer can also be a binary or more copolymer of styrene or its derivatives and other copolymerizable monomers. Things. Here, the so-called styrene derivatives refer to compounds with other groups bonded to styrene, such as o-methyl styrene, m-methyl styrene, p-methyl styrene, 2,4-di Methyl styrene, o-ethyl styrene, p-ethyl styrene and methyl styrene; such as hydroxystyrene, tertiary butoxy styrene, vinyl benzoic acid, o-chlorostyrene, p-chlorostyrene Substituted styrene, etc. by introducing hydroxyl, alkoxy, carboxyl, halogen, etc. into the benzene nucleus of styrene. It is also possible to use a terpolymer as disclosed in Japanese Patent Laid-Open No. 2003-90912 and Japanese Patent Laid-Open No. 2004-167823. The styrene resin is preferably a copolymer of styrene or a styrene derivative and at least one monomer selected from acrylonitrile, maleic anhydride, methyl methacrylate, and butadiene. The styrene resin of the core layer is preferably made of heat-resistant ones, and its Tg is usually 100°C or higher. The preferred Tg of the styrene resin is 120°C or higher.

The core layer made of styrene resin is preferably set so that its thickness becomes 10 to 100 μm. When the thickness is less than 10 μm, it may not be easy to develop a sufficient hysteresis value by extension. On the other hand, when the thickness exceeds 100μm, the impact strength of the film tends to be weakened, and the hysteresis value change caused by external stress tends to increase, and it is easy to produce white spots when applied to a liquid crystal display device, and the display performance is easy. low.

The surface layers arranged on both sides of the core layer containing the aforementioned styrene resin are composed of a (meth)acrylic resin composition in which rubber particles are blended with a (meth)acrylic resin.

Here, examples of the (meth)acrylic resin include homopolymers of alkyl methacrylate or alkyl acrylate, copolymers of alkyl methacrylate and alkyl acrylate, and the like. Examples of alkyl methacrylates include methyl methacrylate, ethyl methacrylate, and propyl methacrylate. Examples of alkyl acrylates include methyl acrylate. , Ethyl acrylate, Propyl acrylate, etc. As such (meth)acrylic resins, commercially available general-purpose (meth)acrylic resins can be used. In addition, (meth)acrylic resins include those called impact-resistant (meth)acrylic resins, and those that have a glutaric anhydride structure and a lactone ring structure in the main chain are also included. Highly heat-resistant (meth)acrylic resin.

The rubber particles prepared by the (meth)acrylic resin are preferably acrylic. The so-called acrylic rubber particles refer to particles having rubber elasticity obtained by polymerizing alkyl acrylates such as butyl acrylate and 2-ethylhexyl acrylate as main components in the presence of a polyfunctional monomer. Such particles having rubber elasticity may be formed in a single layer, or may be a multilayer structure having at least one rubber elastic layer. Examples of acrylic rubber particles with a multilayer structure include the following: a particle having rubber elasticity as described above as a core, and a hard alkyl methacrylate polymer covering the surroundings; a hard alkyl methacrylate The base ester polymer is used as the core, and the surrounding is covered with an acrylic polymer with rubber elasticity as described above; and the hard core is covered with an acrylic polymer with rubber elasticity, and a hard alkyl methacrylate is used. Ester-based polymer covering its surroundings, etc. The average diameter of the rubber particles formed by the elastic layer is usually in the range of about 50 to 400 nm.

The content of the aforementioned rubber particles in the (meth)acrylic resin composition constituting the surface layer is usually about 5 to 50 parts by weight per 100 parts by weight of the (meth)acrylic resin. Since the (meth)acrylic resin and acrylic rubber particles are commercially available in a mixed state, the commercially available products can be used. Examples of commercially available products of (meth)acrylic resins prepared with acrylic rubber particles include "HT55X" and "TECHNOLLOY (registered trademark) S001" sold by Sumitomo Chemical Co., Ltd. Such a (meth)acrylic resin composition usually has a Tg of 160°C or less, and preferably has a Tg of 120°C or less, and furthermore, 110°C or less.

The surface layer of the (meth)acrylic resin composition prepared with rubber particles, preferably acrylic rubber particles, preferably has a thickness of 10 to 100 μm.

When the thickness is less than 10 μm, film formation tends to become difficult. On the other hand, when the thickness exceeds 100 μm, the hysteresis value of the (meth)acrylic resin layer tends not to be ignored.

As mentioned above, the retardation film used in the present invention contains a core layer of styrene resin with a Tg of 120°C or higher. On the other hand, it contains a (meth)acrylic resin composition with rubber particles. The surface layer of the object has a Tg of 120°C or less, and more preferably 110°C or less. The Tg of the two do not overlap, and it is preferable that the core layer including the styrene resin has a higher Tg than the surface layer including the (meth)acrylic resin composition prepared with rubber particles.

To manufacture the retardation film used in the present invention, for example, a styrene resin and a (meth)acrylic resin composition prepared with rubber particles may be co-extruded, and then stretched.

In addition, it is also possible to adopt a method of thermally fusing and extending each single-layer film by thermal lamination.

In this retardation film, a three-layer structure including a surface layer of a (meth)acrylic resin composition prepared with rubber particles is formed on both sides of a core layer containing a styrene-based resin. In this three-layer structure, the surface layers arranged on both sides are usually set to almost the same thickness.

With such a three-layer structure, the surface layer of the (meth)acrylic resin composition containing rubber particles functions as a protective layer and has excellent mechanical strength and chemical resistance.

The retardation film constructed as described above is extended to give an in-plane hysteresis value. The stretching system can be performed by well-known longitudinal uniaxial stretching and tenter transverse uniaxial stretching, simultaneous biaxial stretching, successive biaxial stretching, etc., and can be extended in a manner that can obtain the required hysteresis value.

For example, when the first polarizer 32 (long strip) has an absorption axis in its longitudinal direction, the stretching process is performed so that the slow axis becomes a direction of approximately 45° or approximately 135°. By doing so, the first polarizer 32 (polarizing plate) and the λ/4 plate 35 can be continuously laminated in a roll-to-roll manner. As a result, the manufacturing steps can be significantly shortened.

In addition, in the present invention, the thickness of the first layer and the second layer constituting the resin multilayer film is the value before stretching. In the retardation film after stretching, the lower limit of the thickness of each layer may be slightly lower than the aforementioned value. . However, it is more preferable to have a thickness in the aforementioned range after stretching.

In the third and sixth embodiments of the present invention, as the λ/4 plate 35, a retardation film made of the material of the second λ/2 plate 55 of the first to fifth embodiments can be used.

In addition, the retardation value of the λ/4 plate in the third and sixth embodiments of the present invention means that the retardation value Re at the measurement wavelength of 590 nm is 120 nm to 160 nm. In addition, the Nz coefficient defined by the following formula (d) of the λ/4 plate is preferably in the range of 0.8 to 1.2. Preferably it is the range of 0.95 to 1.05.

Nz=Re/Rth+0.5 (d)

In Embodiment 6 of the present invention, as the λ/2 plate 55, the retardation film manufactured with the material of the λ/4 plate 35 in Embodiments 1, 2, 4, and 5 can be used.

In addition, the retardation value of the λ/2 plate in the sixth embodiment of the present invention means that the retardation value Re at the measurement wavelength of 590 nm is 200 nm to 300 nm. In addition, the Nz coefficient defined by the following formula (d) is in the range of -0.5 to 0.5, preferably in the range of -0.2 to 0.2.

Nz=(nx-nz)/(nx-ny)=Re/Rth+0.5 (d)

[Positive C plate 34, 54]

The positive C plate used in the present invention refers to a retardation film in which nx and ny have substantially equal positive uniaxiality and have an optical axis in the film normal direction. When expressed in terms of refractive index, it is a retardation film having a relationship of _{n x} ≒ n _y <n _z.

In the first and fourth embodiments of the present invention, the in-plane hysteresis value Re of the positive C plate 54 is preferably 20 nm or less, and more preferably 10 nm or less. In addition, the retardation value Rth in the thickness direction is preferably from -150 nm to -250 nm. Preferably it is -190nm to -220nm.

In the embodiments 2, 3, 5, and 6 of the present invention, the in-plane hysteresis value Re of the positive C plates 34 and 54 is preferably 20 nm or less, and more preferably 10 nm or less. In addition, the retardation value Rth in the thickness direction is preferably -50 nm to -150 nm. Preferably it is -70nm to -120nm.

As long as the positive C plates 34 and 54 have the aforementioned optical properties, there are no particular restrictions on their materials and forms. For example, it is possible to use a retardation film composed of a birefringent polymer film; and a retardation film having a retardation layer formed by coating or transferring a low-molecular or high-molecular liquid crystal compound on a transparent support. Of any kind. In addition, they can also be used in layers.

A retardation film composed of a birefringent polymer film having the above-mentioned optical properties can be easily formed by the following method: laminating the heat-shrinkable film, applying a predetermined tension while heating, and placing the polymer film on the film A method of extending in the thickness direction; a method of coating and drying a vinyl carbazole polymer. In addition, as a retardation layer formed from a liquid crystal compound having the above-mentioned optical properties, an example can be exemplified: a cholesteric discotic liquid crystal compound and a composition containing an opposing structural unit such that the helix axis is aligned substantially perpendicular to the substrate Then, a layer formed by immobilization; and a layer formed by aligning the rod-shaped liquid crystal compound and the composition with a positive refractive index anisotropy substantially perpendicular to the substrate and then immobilizing. The rod-shaped liquid crystal compound may be a low-molecular compound or a high-molecular compound.

Furthermore, not only a single retardation layer, but also a plurality of retardation layers can be laminated to form a retardation layer exhibiting the above-mentioned optical characteristics. In addition, the entire laminate of the support and the retardation layer may constitute the retardation layer so as to satisfy the above-mentioned optical characteristics. As the rod-shaped liquid crystal compound used, it can be suitably used to obtain a nematic liquid crystal phase, a discotic liquid crystal phase, and a liquid crystal phase state in the temperature range where the alignment is fixed. It is better to obtain disc-shaped A-phase and B-phase liquid crystals that do not shake and have a uniform vertical alignment. Compared with nematic liquid crystal phases, the birefringence of these phases is larger and the film thickness can be made thinner, which is also preferable. In particular, in the presence of additives, it is also preferable to use a composition containing the additive and the rod-shaped liquid crystalline compound to form a layer for the rod-shaped liquid crystalline compound that becomes the above-mentioned liquid crystal state in an appropriate alignment temperature range.

烷類、二苯基乙炔類及烯基環己基苯甲腈類。不僅是如上述的低分子液晶性分子，亦能夠使用高分子液晶性分子。液晶分子係能夠適合使用具有藉由活性光線、電子射線、熱等而能夠產生聚合和交聯反應的部分結構者。該部分結構的個數為1至6個，較佳為1至3個。 As the aforementioned rod-shaped liquid crystalline compounds, suitable use are: azomethines, azo oxides, cyanobiphenyls, cyanophenyl esters, benzoic acid esters, phenyl cyclohexanecarboxylic acid esters, cyano Phenyl cyclohexanes, cyano substituted phenyl pyrimidines, alkoxy substituted phenyl pyrimidines, phenyl bis

Alkanes, diphenyl acetylenes and alkenyl cyclohexyl benzonitriles. Not only the low-molecular-weight liquid crystal molecules as described above, but also high-molecular-weight liquid crystal molecules can be used. The liquid crystal molecule system can suitably use those having a partial structure capable of causing polymerization and crosslinking reactions by active rays, electron rays, heat, and the like. The number of this partial structure is 1 to 6, preferably 1 to 3.

When a retardation layer formed by fixing a rod-shaped liquid crystalline compound in an aligned state is included, it is preferable to use a retardation layer formed by aligning the rod-shaped liquid crystalline compound substantially vertically and fixing the state. The term "substantially vertical" means that the angle between the film surface and the director of the rod-shaped liquid crystalline compound is in the range of 70° to 90°. The liquid crystal compounds can be tilted and aligned, or they can be mixed and aligned in a way that the tilt angle changes gradually. In the case of inclined alignment or mixed alignment, the average inclination angle is preferably 70° to 90°, preferably 80° to 90°, and most preferably 85° to 90°.

The retardation layer formed by the rod-shaped liquid crystalline compound can be coated with a coating solution containing the rod-shaped liquid crystalline compound, the following polymerization initiator, air interface vertical alignment agent, and other additives as required. The vertical alignment film formed on the support is arranged on the vertical alignment film, and the alignment state is fixed to form the vertical alignment film. When it is formed on a temporary support, it can also be manufactured by transferring the retardation layer to the support. In addition, not only a single retardation layer, but also a plurality of retardation layers may be laminated to form a retardation layer exhibiting the above-mentioned optical characteristics. In addition, the entire laminate of the support and the retardation layer may satisfy the above-mentioned optical characteristics to form the retardation layer.

In Embodiments 1, 3, and 6 of the present invention, a positive C-plate layer formed of a liquid crystalline compound may be laminated on the aforementioned λ/4 plate 35 to be formed.

In Embodiments 2, 4, and 5 of the present invention, a positive C-plate layer formed of a liquid crystalline compound may be stacked on the aforementioned λ/2 plate 55 to be formed.

[Brightness Enhancement Film 61]

The brightness enhancement film 61 is also called a reflective polarizer, and it is possible to use a polarization conversion element having a function such as separating light emitted from a light source (backlight) into penetrating polarized light and reflected polarized light or scattered polarized light. As described above, by arranging the brightness enhancement film 61 on the polarizing plate 50, it is possible to improve the emission efficiency of the linearly polarized light emitted from the polarizing plate 50 by using the returning light of the reflected polarized light or the scattered polarized light.

The brightness improvement film 61 system can be an anisotropic reflective polarizer, for example. An example of anisotropic reflective polarizer is an anisotropic multilayer film that transmits linearly polarized light in one vibration direction and reflects linearly polarized light in the other vibration direction. A specific example is DBEF (Japan Special Kaiping 4-268505 Bulletin, etc.). Another example of anisotropic reflective polarizer, It is a composite of a cholesteric liquid crystal layer and a λ/4 plate, and a specific example thereof is PCF manufactured by Nitto Denko Co., Ltd. (Japanese Patent Application Laid-Open No. 11-231130, etc.). Another example of the anisotropic reflective polarizer is a reflective grid polarizer. A specific example is a metal lattice reflective polarizer that can emit reflected polarized light in the visible light region by performing micro-processing on metal (U.S. Patent No. 6288840, etc.) ), and a film formed by adding metal fine particles to a polymer matrix and extending it (Japanese Patent Application Laid-Open No. 8-184701).

On the surface of the brightness enhancement film 61 opposite to the polarizing plate 50, an optical layer such as a hard coat layer, an anti-glare layer, a light diffusion layer, and a retardation layer having a retardation value of 1/4 wavelength may be provided. By forming the optical layer, the adhesion to the backlight band and the uniformity of the displayed image can be improved. The thickness of the brightness enhancement film 61 can be about 10 to 100 μm, and from the viewpoint of film formation of the polarizing plate, it is preferably 10 to 50 μm, preferably 10 to 30 μm.

[Next to each layer]

It is preferable to provide any suitable adhesive layer or adhesive layer between each member constituting the polarizing plate of the present invention. In addition, in order to attach the polarizing plate to the liquid crystal cell, it is better to arrange the adhesive layer on the surface of the polarizing plate. In this embodiment, for example, the adhesive can be provided on the outside of the λ/4 plate 35, and the adhesive layer can be provided on the outside of the λ/2 plate 55.

Examples of the adhesive for forming the adhesive layer include water-based adhesives, and active energy ray-curable adhesives that are cured by irradiation with ultraviolet rays or electron beams. As an active energy ray curable adhesive, for example, a composition containing a radical polymerizable compound such as an acrylic compound and a composition containing a cationic polymerizable compound such as an epoxy compound. These compositions preferably contain a radical polymerization initiator or a cationic polymerization initiator, respectively. As the adhesive, an adhesive containing acrylic resin (acrylic adhesive) is preferred.

[Liquid Crystal Unit 60]

The liquid crystal cell has a pair of substrates and a liquid crystal layer sandwiched between the substrates as a display medium. A color filter and a black matrix are provided on a substrate (color filter substrate) on one side. The other side of the substrate (active matrix substrate) is provided with switching elements (represented by TFTs) for controlling the electro-optical characteristics of liquid crystals, scanning lines for providing gate signals to the switching elements, signal lines for providing source signals, and pixel electrodes.

In addition, the color filter can also be arranged on the side of the active matrix substrate. The interval between the above-mentioned substrates (liquid crystal cell gap) is controlled by spacers. On the side in contact with the liquid crystal layer between the above-mentioned substrates, for example, an alignment film made of polyimide is provided.

As the driving mode of the above-mentioned liquid crystal cell for arranging the polarizing plate group of Embodiments 1 to 3 of the present invention, IPS (In-Plane Switching; In-Plane Switching) with an in-plane retardation value of 100 to 200 nm at a wavelength of 590 nm is used. )mode. Such a liquid crystal cell itself has an in-plane retardation value close to the wavelength of λ/4, whereby a circular polarizing plate can be arranged as a viewing-side polarizing plate and the reflection of external light can be greatly reduced.

As a method of making the in-plane phase difference of the liquid crystal cell 100 nm to 200 nm at a wavelength of 590 nm, it can be manufactured by adjusting the thickness of the liquid crystal of the liquid crystal cell. For example, by adjusting the thickness of the liquid crystal of the liquid crystal cell to about 1 to 2 µm, a liquid crystal cell having a desired in-plane retardation value can be manufactured.

As a driving mode of the liquid crystal cell used to configure the polarizing plate group of the fourth to sixth embodiments of the present invention, an IPS (In-Plane Switching) mode with an in-plane phase difference of 400 to 500 nm at a wavelength of 590 nm is adopted. Such a liquid crystal cell itself has an in-plane retardation value close to a wavelength of 3λ/4, whereby a circular polarizing plate can be arranged as a viewing side polarizing plate and the reflection of external light can be greatly reduced.

As a method of making the in-plane phase difference of the liquid crystal cell 400 nm to 500 nm at a wavelength of 590 nm, it can be manufactured by adjusting the thickness of the liquid crystal of the liquid crystal cell. For example, by adjusting the thickness of the liquid crystal of the liquid crystal cell to about 1 to 6 μm, a liquid crystal cell having a required in-plane retardation value can be manufactured.

[Liquid crystal display device]

The liquid crystal display device of the present invention includes the polarizing plate group of the present invention and the above-mentioned liquid crystal cell. The liquid crystal display device of the present invention has excellent visibility especially even outdoors where external light is strong, so it can be suitably used for small and medium-sized liquid crystal display devices. For example, it is suitable for the case where the size of the liquid crystal display device is 15 inches or less diagonally.

The axial configuration of each member of the liquid crystal display device according to Embodiment 1 of the present invention will be described with reference to Fig. 2. For convenience of description, the initial alignment direction of the liquid crystal cell used in the present invention is set to 0°, and when the back side polarizing plate is viewed from the viewing side polarizing plate, the angle of the counterclockwise rotation direction is defined as positive. The slow phase shafts of the λ/4 plate 35 and the λ/2 plate 55 are arranged at approximately 90° to the aforementioned initial alignment direction. In addition, the absorption axis of the polarizing plate on the visible side is arranged at approximately 45° to the initial alignment direction, and the absorption axis of the polarizing plate on the back side is arranged at approximately 135° to the initial alignment direction. It is recorded here as roughly. When, it means that its value is in the range of ±5°, preferably in the range of ±2°.

In addition, in the first embodiment of the present invention, the so-called initial alignment direction of the liquid crystal cell refers to the alignment direction of the liquid crystal molecules in the initial state when no driving voltage is applied to the liquid crystal cell. The initial alignment angle is the angle between the long sides of the liquid crystal cell It is better to be roughly parallel.

The axial configuration of each member of the liquid crystal display device in the second embodiment of the present invention will be described with reference to Fig. 3.

The λ/4 plate 35 is arranged at approximately -90° to the aforementioned initial alignment direction, and the slow axis of the λ/2 plate 55 is arranged at approximately 0° to the aforementioned initial alignment direction. In addition, the absorption axis of the viewing-side polarizing plate is arranged at approximately -45° with respect to the aforementioned initial alignment direction, and the absorption axis of the back-side polarizing plate is arranged at approximately -45°.

In addition, in the second embodiment of the present invention, the initial alignment direction of the liquid crystal cell refers to the alignment direction of the liquid crystal molecules in the initial state when no driving voltage is applied to the liquid crystal cell. The initial alignment angle of the liquid crystal cell is preferably 45° to the longitudinal direction of the liquid crystal cell.

The axial configuration of each member of the liquid crystal display device in the third embodiment of the present invention will be described with reference to FIG. 5.

The λ/4 plate 35 is arranged at approximately -90° to the aforementioned initial alignment direction, and the slow axis of the λ/2 plate 55 is arranged at approximately 0° to the aforementioned initial alignment direction. The absorption axis of the viewing-side polarizing plate is arranged at approximately 45° to the aforementioned initial alignment direction, and the absorption axis of the back-side polarizing plate is arranged at approximately 45°.

In addition, in Embodiment 3 of the present invention, the initial alignment direction of the liquid crystal cell refers to the alignment direction of the liquid crystal molecules in the initial state where no driving voltage is applied to the liquid crystal cell. The initial alignment angle of the liquid crystal cell is preferably 45° with respect to the longitudinal direction of the liquid crystal cell.

With reference to Fig. 6, the axial configuration of each member of the liquid crystal display device in the fourth and fifth embodiments of the present invention will be described.

The slow axis of the λ/4 plate 35 and the λ/2 plate 55 are arranged at approximately 0° to the aforementioned initial alignment direction. Furthermore, the absorption axis of the viewing-side polarizer is arranged at approximately 135° to the aforementioned initial alignment direction, and the absorption axis of the back-side polarizing plate is arranged at approximately 45° to the aforementioned initial alignment direction.

In addition, in Embodiments 4 and 5 of the present invention, the initial alignment direction of the liquid crystal cell refers to the alignment direction of the liquid crystal molecules in the initial state where no driving voltage is applied to the liquid crystal cell.

With reference to Fig. 7, the axial configuration of each member of the liquid crystal display device according to the sixth embodiment of the present invention will be described. The slow axis of the λ/4 plate 35 and the λ/2 plate 55 are arranged at approximately 0° in the aforementioned initial alignment direction. Furthermore, the absorption axis of the viewing-side polarizer is arranged at approximately 135° to the aforementioned initial alignment direction, and the absorption axis of the back-side polarizing plate is arranged at approximately 45° to the aforementioned initial alignment direction.

In addition, in the sixth embodiment of the present invention, the initial alignment direction of the liquid crystal cell refers to the alignment direction of the liquid crystal molecules in the initial state where no driving voltage is applied to the liquid crystal cell.

[Example]

Hereinafter, examples are shown to further specifically explain the present invention, but the present invention is not limited by these examples. In the examples, the parts and% representing the content or usage amount are based on weight unless otherwise stated. Also, regarding the angle system, the counterclockwise rotation is set to be positive. In addition, the measurement of each physical property in the following example was performed using the following method.

(1) Measurement of thickness:

It is measured using a digital micrometer "MH-15M" manufactured by Nikon Co., Ltd.

(2) Measurement of in-plane hysteresis value and thickness direction hysteresis value:

Using the phase difference meter "KOBRA (registered trademark)-WPR" manufactured by Oji Metrology Co., Ltd. based on the parallel Nicole rotation method (parallel Nicole rotation method), the surface at each wavelength was measured at a temperature of 23°C. Internal hysteresis value and thickness direction hysteresis value.

(3) Measurement of polarization degree and monomer transmittance of polarizing plate:

The measurement was performed using a spectrophotometer with an integrating sphere ["V7100" manufactured by JASCO Corporation, 2 degree field of view; C light source].

(4) Measurement of the shrinkage force of the polarizer:

The polarizer was cut into a width of 2 mm and a length of 50 mm using a Super Cutter (cutting device) (manufactured by Ogino Seiki Seisakusho Co., Ltd.) so that the direction of measuring shrinkage force (the direction of the absorption axis of the polarizer) becomes the long side. The obtained long wafer was used as a test piece. The shrinkage force of the test piece was measured using a thermomechanical analyzer (manufactured by SII Nano Technology Co., Ltd., model TMA/6100). The measurement is based on the dimensional fixed model The formula is implemented and the distance between the chucks is set to 10mm. After placing the test piece in a 23°C 55% room for more than 24 hours, set the temperature in the sample room to increase from 23°C to 80°C in 1 minute. After the temperature rises, the temperature in the sample room is maintained at 80°C. Mode setting. After the temperature was raised, it was left to stand for another 4 hours, and the shrinkage force in the longitudinal direction of the test piece was measured in an environment of 80°C.

In this measurement, the static load was set to 0 mN, and a probe made of SUS was used for the jig.

[Manufacturing Example 1] Manufacturing of Polarizer

A polyvinyl alcohol film with a thickness of 30μm (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) is uniaxially stretched to about 4 times by dry stretching, and further immersed in pure water at 40°C while keeping it tightly in tension. After 40 seconds, it was immersed in an aqueous solution with a weight ratio of iodine/potassium iodide/water of 0.052/5.7/100 at 28°C for 30 seconds to perform dyeing treatment. Subsequently, it was immersed in an aqueous solution with a weight ratio of potassium iodide/boric acid/water of 11.0/6.2/100 at 70°C for 120 seconds. Then, after washing with pure water at 8°C for 15 seconds, it was dried at 60°C for 50 seconds while maintaining a tension of 300N, followed by drying at 75°C for 20 seconds to obtain the iodine adsorption alignment on the polyvinyl alcohol film. Absorption polarizer with a thickness of 12μm. When the shrinkage force of the obtained polarizer was measured, it was 2.0 N/2 mm.

[Production example 2] Production of water-based adhesive

With respect to 100 parts by weight of water, 3 parts by weight of carboxyl modified polyvinyl alcohol [trade name "KL-318" obtained from KURARAY Co., Ltd.] are dissolved, and polyamide epoxy, which is a water-soluble epoxy resin, is added to the aqueous solution. A water-based adhesive was prepared by adding 1.5 parts by weight of an additive [trade name "Sumirez Resin (registered trademark) 650(30)" obtained from Taoka Chemical Industry Co., Ltd., an aqueous solution with a solid concentration of 30% by weight).

[Adhesive A, B]

Prepare the following 2 types of adhesives.

Adhesive A: A sheet-like adhesive with a thickness of 25 μm ["P-3132" manufactured by LINTEC Co., Ltd.]

Adhesive B: A sheet-like adhesive with a thickness of 5 μm ["NCF #L2" manufactured by LINTEC Co., Ltd.]

[Protective film A, B, C, D]

Prepare the following 4 types of protective films.

Protective film A: cellulose triacetate film with hard coating made by Konica Minolta Co., Ltd.; 25KCHCN-TC (thickness 32μm)

Protective film B: Cellulose triacetate film manufactured by Konica Minolta Co., Ltd.; KC2UA (thickness 25μm)

Protective film C: Cyclic polyolefin resin film made by Japan's ZEON Co., Ltd.; ZF14-013 (thickness 13μm, in-plane retardation value at wavelength 590nm = 0.8nm, retardation value in thickness direction at wavelength 590nm = 3.4nm )

Protective film D: Anti-reflection film containing cellulose triacetate resin made by TOPPAN TOMOEGAWA Optical Products Co., Ltd.; 40KSPLR (thickness 44μm, Y value 1.1% according to JIS-Z8701-1982)

[Brightness enhancement film A]

Prepare the following brightness enhancement film.

Brightness enhancement film A: 26μm thick brightness enhancement film (brand name Advanced Polarized Film, Version 3 manufactured by 3M)

[Manufacturing of λ/4 plate (1)]

The styrene-maleic anhydride copolymer resin ["Dylark (registered trademark) D332" (Tg=131°C) manufactured by NOVA Chemicals Co., Ltd.] was used as the core layer, and about 20% of the average particle size was 200μm. Acrylic rubber particles of methacrylic resin [resin used in "TECHNOLLOY (registered trademark) (registered trademark) S001" manufactured by Sumitomo Chemical Co., Ltd. (Tg=105°C)] are used as the surface layer and are co-extruded with three layers A three-layer resin film with a core layer thickness of 60 μm and a surface layer of 72 μm in thickness was formed on both sides of the resin three-layer film. This three-layer resin film was stretched twice at 142°C to obtain a negative retardation film having an in-plane retardation value of 140 nm at a wavelength of 590 nm and an Nz coefficient of 0.0.

[Manufacturing of λ/4 plate (2)]

After forming a polyvinyl alcohol film (thickness 0.1μm) on the surface of the base film (cellulose triacetate film, thickness 80μm), rub the surface of the polyvinyl alcohol film with a rubbing cloth at a direction of 135° with respect to the longitudinal direction of the substrate Process to produce a base film with an alignment film.

Next, 10g of polymerizable liquid crystal (manufactured by BASF Corporation, trade name Paliocolor LC242) showing a nematic liquid crystal phase, and a photopolymerization initiator corresponding to the polymerizable liquid crystal compound (manufactured by Ciba Specialty Chcmicals Corporation, trade name IRGACURE (registered trademark) 907 , 0.5 g containing 1% benzotriazole-based ultraviolet absorber) was dissolved in 40 g of toluene to prepare a coating liquid. Then, after the coating liquid was coated on the surface of the alignment substrate obtained above using a rod coater, the liquid crystal was aligned by heating and drying at 90° C. for 2 minutes. In the liquid crystal layer formed in this manner, ^{the liquid crystal layer was cured by irradiating light of 20 mJ/cm 2} with a metal halide lamp to form a retardation layer on the substrate. The thickness of the obtained retardation layer was 1 μm, and the in-plane retardation value was 139.8 nm at a wavelength of 590 nm.

[Manufacturing of λ/4 plate (3)]

In the manufacture of the above-mentioned λ/4 plate (2), except that the surface of the polyvinyl alcohol film is rubbed in a direction of 45° with respect to the longitudinal direction of the substrate, the same method as the manufacture of the λ/4 plate (2) is used. The method of manufacturing λ/4 plate. The thickness of the obtained retardation layer was 1 μm, and the in-plane retardation value was 139.8 nm at a wavelength of 590 nm.

[Manufacturing of λ/2 plate (1)]

After forming a polyvinyl alcohol film (thickness 0.1μm) on the surface of the base film (cellulose triacetate film, thickness 80μm), rubbing the surface of the polyvinyl alcohol film with a rubbing cloth in the direction of the length of the substrate at 135° And manufacture the base film with the alignment film.

Next, 10g of polymerizable liquid crystal (manufactured by BASF Corporation, trade name Paliocolor LC242) showing a nematic liquid crystal phase, and a photopolymerization initiator corresponding to the polymerizable liquid crystal compound (manufactured by Ciba Specialty Chemicals, trade name IRGACURE (registered trademark) 907. 0.5 g containing 1% benzotriazole-based ultraviolet absorber) was dissolved in 40 g of toluene to prepare a coating liquid. Then, after the coating liquid was coated on the surface of the alignment substrate obtained above using a rod coater, the liquid crystal was aligned by heating and drying at 90° C. for 2 minutes. In the liquid crystal layer formed in this manner, ^{the liquid crystal layer was cured by irradiating light of 20 mJ/cm 2} with a metal halide lamp to form a retardation layer on the substrate. The thickness of the obtained retardation layer was 2 μm, and the in-plane retardation value was 258.6 nm at a wavelength of 590 nm.

[Manufacturing of λ/2 plate (2)]

The styrene-maleic anhydride copolymer resin ["Dylark (registered trademark) D332" (Tg=131°C) manufactured by NOVA Chemicals Co., Ltd.] was used as the core layer, and about 20% of the average particle size was 200μm. Acrylic rubber particles of methacrylic resin [resin used in "TECHNOLLOY (registered trademark) (registered trademark) S001" manufactured by Sumitomo Chemical Co., Ltd. (Tg=105°C)] are used as the surface layer and are co-extruded with three layers To obtain a three-layer resin film with a core layer thickness of 60 μm and a surface layer of 72 μm formed on both surfaces. This three-layer resin film was stretched at 142° C. to quadruple to obtain a negative retardation film having an in-plane retardation value of 260 nm at a wavelength of 590 nm and an Nz coefficient of 0.0.

[Manufacturing of Positive C Plate 1]

A commercially available vertical alignment film (JALS-204R, manufactured by Nippon Synthetic Rubber Co., Ltd.) was diluted 1:1 with methyl ethyl ketone, and then coated on the base film (triacetate fiber) using a wire-wound bar coater. Plain film, thickness 80μm) surface (coating amount 2.4ml/m ² ). Immediately dry it with warm air at 120°C for 120 seconds.

Next, 3.8 g of the following rod-shaped liquid crystal compound, 0.06 g of a photopolymerization initiator (IRGACURE (registered trademark) 907, manufactured by CIBA-GEIGY), a sensitizer (KAYACURE (registered trademark) DETX, Nippon Kayaku Co., Ltd. (Company made) 0.02 g and 0.002 g of the air interface side vertical alignment agent described below were dissolved in 9.2 g of methyl ethyl ketone to prepare a solution. This solution was coated on the aforementioned film formed with the alignment film using a wire rod, and heated at 100° C. for 2 minutes to align the rod-shaped liquid crystal compound. Next, a 120 W/cm ² high-pressure mercury lamp was used at 80° C. to irradiate the rod-shaped liquid crystal compound with UV light for 20 seconds to cross-link the rod-shaped liquid crystal compound. Then, it was allowed to cool to room temperature to produce a retardation layer with the characteristics of a positive C plate. The thickness of the obtained retardation layer was 1 μm, and the retardation value in the thickness direction at a wavelength of 590 nm was -194.3 nm.

Rod-shaped liquid crystal compound:

Vertical alignment agent on the air interface side:

Exemplary compound (II-4) described in Japanese Patent Application No. 2003-119959:

[Manufacturing of positive C plates 2 to 7]

The positive C plates 2 to 7 are manufactured in the same manner as the positive C plate 1. The retardation value is adjusted to the desired retardation value by adjusting the thickness.

The retardation value of the thickness direction of the positive C plate 2 Rth(590)=-219.6nm, the retardation value of the thickness direction of the positive C plate 3 Rth(590)=-247.2nm, the retardation value of the thickness direction of the positive C plate 4 Value Rth(590)=-266.1nm, the retardation value of the thickness direction of the positive C plate 5 Rth(590)=-109.4nm, the retardation value of the thickness direction of the positive C plate 6 Rth(590)=-91.2nm, The retardation value of the thickness direction of the positive C plate 7 Rth(590)=-69.1nm

[Manufacturing of Polarizing Plate A]

The protective film A is subjected to saponification treatment and the bonding surface of the protective film C to the polarizer is subjected to corona treatment. So that the cellulose triacetate surface of the protective film A and The corona-treated surface of the protective film C is used as a bonding surface with the polarizer, and the protective film A and the polarizer and the protective film C are bonded together using a water-based adhesive to obtain the polarizer A.

[Manufacturing of Polarizing Plate B]

The protective film B is subjected to saponification treatment, and the bonding surface of the protective film C to the polarizer is subjected to corona treatment. The protective film B and the polarizer and the protective film C are bonded together using a water-based adhesive so that the corona-treated surfaces of the protective film B and the protective film C are bonded to the polarizer to obtain the polarizer B. Stick the adhesive B on the protective film B side of the polarizing plate B. At this time, corona treatment is performed on the bonding surface of the protective film B and the adhesive B. Finally, the brightness enhancement film A is bonded to the adhesive B surface of the polarizing plate to obtain the polarizing plate B.

[Manufacturing of analog liquid crystal cell A]

Prepare two sheets of alkali-free glass made by Corning: EAGLE XG (thickness 0.7 mm, size of 157 mm in the vertical direction × 98 mm in the horizontal direction) bonded with the adhesive B. At this time, corona treatment is performed on the bonding surface of the glass and the adhesive. Next, the λ/4 plate (1) manufactured above was bonded to the adhesive B surface of one piece of glass. At this time, corona treatment was also performed on the λ/4 plate (1) and the adhesive B surface. Finally, the λ/4 surface of the glass to which the λ/4 plate (1) is bonded is bonded to the adhesive B surface of the other glass to produce a pseudo liquid crystal cell A. At this time, corona treatment was performed on the bonding surface of the λ/4 plate surface and the adhesive B. It is manufactured so that the slow axis direction of the λ/4 plate (1) is parallel to the short side direction of the glass.

The initial alignment direction of the aforementioned analog liquid crystal cell A is assumed to be parallel to the longitudinal direction of the glass, and the aforementioned analog liquid crystal cell A is assumed to be a liquid crystal cell when a driving voltage is applied (during white display).

[Manufacturing of Analog Liquid Crystal Cell B]

Prepare two sheets of alkali-free glass made by Corning: EAGLE XG (thickness 0.7 mm, size of 157 mm in the vertical direction × 98 mm in the horizontal direction) bonded with the adhesive B. At this time, corona treatment is performed on the bonding surface of the glass and the adhesive. Next, the λ/4 plate (1) manufactured above was bonded to the adhesive B surface of one piece of glass. At this time, corona treatment was also performed on the λ/4 plate (1) and the adhesive B surface. Finally, the λ/4 surface of the glass to which the λ/4 plate (1) is bonded is bonded to the adhesive B surface of the other glass to produce a pseudo liquid crystal cell B. At this time, corona treatment was performed on the bonding surface of the λ/4 plate surface and the adhesive B. It is manufactured so that the slow axis direction of the λ/4 plate (1) becomes -45° when the longitudinal direction of the glass is set to 0°.

The initial alignment direction of the analog liquid crystal cell B is assumed to be 45° to the longitudinal direction of the glass, and the analog liquid crystal cell B is assumed to be a liquid crystal cell when a driving voltage is applied (during white display).

[Manufacturing of analog liquid crystal cell C]

Prepare two sheets of alkali-free glass made by Corning: EAGLE XG (thickness 0.7 mm, size of 157 mm in the vertical direction × 98 mm in the horizontal direction) bonded with the adhesive B. At this time, corona treatment is performed on the bonding surface of the glass and the adhesive. Next, the λ/4 plate (2) manufactured above is bonded to the adhesive B surface of one piece of glass. At this time, corona treatment was also performed on the λ/4 plate (2) and the adhesive B surface. Finally, the λ/4 surface of the glass on which the λ/4 plate (2) is bonded is bonded to the adhesive B surface of the other glass to produce a pseudo liquid crystal cell C. At this time, corona treatment was performed on the bonding surface of the λ/4 plate surface and the adhesive B. It is manufactured so that the slow axis direction of the λ/4 plate (2) becomes -45° when the longitudinal direction of the glass is set to 0°.

The initial alignment direction of the analog liquid crystal cell C is assumed to be 45° to the longitudinal direction of the glass, and the analog liquid crystal cell C is assumed to be a liquid crystal cell when a driving voltage is applied (during white display).

[Manufacturing of analog liquid crystal cell D]

Prepare two sheets of alkali-free glass made by Corning: EAGLE XG (thickness 0.7 mm, size of 157 mm in the vertical direction × 98 mm in the horizontal direction) bonded with the adhesive B. At this time, corona treatment is performed on the bonding surface of the glass and the adhesive. Next, the previously manufactured λ/4 plate (1) is bonded to the adhesive B surface of the two sheets of glass. At this time, the λ/4 plate (1) and the adhesive B surface are corona treated. Furthermore, the adhesive B was bonded to the λ/4 plate (1) surface of the two glass sheets. At this time, corona treatment was also performed on the λ/4 plate (1) and the adhesive B surface. One sheet of glass is further bonded to the B surface of the adhesive with a λ/4 plate (1). At this time, corona treatment was also performed on the λ/4 plate (1) and the adhesive B surface. Finally, the λ/4 surface (1) of one piece of glass was bonded to the adhesive B surface of the other piece of glass to produce a pseudo liquid crystal cell D. At this time, corona treatment was performed on the bonding surface of the λ/4 plate (1) surface and the adhesive B. It is manufactured so that the slow axis direction of all the λ/4 plates (1) is parallel to the longitudinal direction of the glass.

The initial alignment direction of the aforementioned analog liquid crystal cell D is assumed to be parallel to the short-side direction of the glass, and the aforementioned analog liquid crystal cell D is assumed to be a liquid crystal cell when a driving voltage is applied (during white display).

[Manufacturing of analog liquid crystal cell E]

Prepare two sheets of alkali-free glass made by Corning: EAGLE XG (thickness 0.7mm, size of 157mm in length x 98mm in width) and bonded with adhesive B. At this time, corona treatment is performed on the bonding surface of the glass and the adhesive. Next, the previously manufactured λ/4 plate (3) is bonded to the adhesive B surface of the two sheets of glass. At this time, the λ/4 plate (3) and the adhesive B surface are corona treated. Furthermore, the adhesive B was bonded to the λ/4 plate (3) surface of the two glass sheets. At this time, corona treatment was also performed on the λ/4 plate (3) and the adhesive B surface. Furthermore, a λ/4 plate (3) is bonded to the B surface of the adhesive with one glass system. At this time, corona treatment was also performed on the λ/4 plate (3) and the adhesive B surface. Finally, the λ/4 surface (3) of one piece of glass was bonded to the adhesive B surface of the other piece of glass to produce a pseudo liquid crystal cell E. At this time, corona treatment was performed on the bonding surface of the λ/4 plate (3) surface and the adhesive B. It is manufactured so that the slow axis direction of all the λ/4 plates (3) is parallel to the longitudinal direction of the glass.

The initial alignment direction of the aforementioned analog liquid crystal cell E is assumed to be parallel to the short-side direction of the glass, and the aforementioned analog liquid crystal cell E is assumed to be a liquid crystal cell when a driving voltage is applied (during white display).

Furthermore, on one glass surface of the manufactured analog liquid crystal cell, high McKee blue (MO-150-MC-BL) manufactured by ZEBRA Co., Ltd. is used to depict Doraemon (appeared in "Doraemon" by Fujiko F. Fujio The cat-shaped robot, published by Shogakukan).

[Backlight]

The LCD panel is taken out from Nexus7 (registered trademark) manufactured by Google Inc., and a backlight panel is obtained that only uses the backlight panel to turn on the lights.

[Example 1-1]

(Manufacturing of visual recognition side polarizing plate 1-1)

Stick the adhesive B on the surface of the protective film C of the polarizing plate A. At this time, corona treatment was performed on the surface of the protective film C and the bonding surface of the adhesive B. Next, the λ/4 plate (1) is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate (1). Set the angle between the absorption axis of the polarizing plate and the λ/4 plate (1) to be 45° (when viewing the protective film side A of the polarizing plate as the upper side, set the slow axis of the λ/4 plate (1) from the polarizing plate's The absorption axis rotates counterclockwise to become 45°). Furthermore, the adhesive A was attached to the surface of the λ/4 plate (1) of the polarizing plate A. At this time, corona treatment was also performed on the bonding surface of the λ/4 plate (1) of the polarizing plate A and the adhesive A. In this way, the viewing side polarizing plate 1-1 is manufactured.

(Manufacturing of Polarizing Plate 1-1 on the Back Side)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the positive C plate 1 is laminated on the adhesive B side of the polarizing plate B to be manufactured. At this time, corona treatment was performed on the bonding surface of the adhesive B and the positive C plate 1. Furthermore, the adhesive B was attached to the positive C plate 1 surface of the polarizing plate B. At this time, the bonding surface of the positive C plate 1 of the polarizing plate B and the adhesive B was also corona treated. Next, the λ/2 plate (1) is bonded to the adhesive B surface of the polarizing plate B. At this time, corona treatment was also applied to the bonding surface of the adhesive B surface and the λ/2 plate (1). Take the angle between the absorption axis of the polarizing plate and the λ/2 plate (1) to be 45° (when viewing the protective film C from the protective film B, set the slow axis of the λ/2 plate (1) relative to the absorption axis of the polarizing plate Become a 45° counterclockwise rotation configuration) method of bonding. Finally, stick the adhesive A on the λ/2 plate (1) surface of the polarizing plate A. At this time, corona treatment was also performed on the surface of the λ/2 plate (1) and the bonding surface of the adhesive A. In this way, the back side polarizing plate 1-1 was manufactured.

The manufactured viewing-side polarizing plate 1-1 and the back-side polarizing plate 1-1 were cut into a size of 155 mm in the vertical direction×96 mm in the horizontal direction. At this time, when viewing the protective film A of the viewing-side polarizing plate 1-1 or the protective film B of the back-side polarizing plate 1-1 as the upper side, the absorption axis of each polarizing plate becomes 45° with respect to the longitudinal direction. The way is judged separately.

The viewing side polarizing plate 1-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell A was drawn, and the back side polarizing plate 1-1 was bonded to the glass surface of the reverse surface to produce a pseudo liquid crystal panel. The shaft structure at this time is shown in Figure 2(b).

The simulated liquid crystal panel manufactured in this way is placed on the manufactured backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 1-2]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 1-3]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 1-4]

Except that the positive C plate 1 was changed to the positive C plate 4, a pseudo liquid crystal panel was manufactured in the same manner as in Example 1-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 1-5]

Except that the protective film A of the viewing-side polarizing plate 1-1 was changed to the protective film D, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 1-6]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-5.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 1-7]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-5.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 1-8]

Except that the positive C plate 1 was changed to the positive C plate 4, a pseudo liquid crystal panel was manufactured in the same manner as in Example 1-5.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 1-9]

(Manufacturing of Polarizing Plate 1-2 on the Back Side)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/2 plate (1) is laminated on the adhesive B side of the polarizing plate B manufactured. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/2 plate (1). Take the angle between the absorption axis of the polarizing plate and the λ/2 plate (1) to be 45° (when viewing the protective film C from the protective film B, set the slow axis of the λ/2 plate (1) relative to the absorption axis of the polarizing plate Become a 45° counterclockwise rotation configuration) method of bonding. Furthermore, the adhesive B was bonded to the λ/2 plate (1) surface of the polarizing plate B. At this time, the bonding surface of the λ/2 plate (1) of the polarizing plate B and the adhesive B was corona treated. Next, the positive C plate 1 is attached to the adhesive B surface of the polarizing plate B. At this time, corona treatment was also applied to the bonding surface of the adhesive B surface and the positive C plate 1. Finally, the adhesive A is attached to the positive C plate 1 of the polarizing plate B. At this time, corona treatment was also performed on the surface of the positive C plate 1 and the bonding surface of the adhesive A. In this way, the back side polarizing plate 1-2 is manufactured.

The manufactured viewing-side polarizing plate 1-1 and the back-side polarizing plate 1-2 were cut into a size of 155 mm in the vertical direction×96 mm in the horizontal direction. At this time, when viewing the protective film A of the viewing-side polarizing plate 1-1 or the protective film B of the back-side polarizing plate 1-2 as the upper side, the absorption axis of each polarizing plate becomes 45° with respect to the longitudinal direction. The way is judged separately.

The viewing side polarizing plate 1-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell A was drawn, and the back side polarizing plate 1-2 was bonded to the glass surface on the reverse side to produce a pseudo liquid crystal panel. The shaft structure at this time is shown in Figure 2(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 1-10]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-9.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 1-11]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-9.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 1-12]

Except for changing the positive C-plate 1 to the positive C-plate 4, an analog liquid crystal panel was manufactured in the same manner as in Example 1-9.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 1-13]

Except having changed the protective film A of the viewing side polarizing plate 1-1 to the protective film D, it carried out similarly to Example 1-9, and manufactured the pseudo liquid crystal panel.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 1-14]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-13.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 1-15]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was manufactured in the same manner as in Example 1-13.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 1-16]

Except for changing the positive C-plate 1 to the positive C-plate 4, an analog liquid crystal panel was manufactured in the same manner as in Example 1-13.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Comparative Example 1]

The upper and lower polarizing plates were peeled from the Nexus 7 (registered trademark) liquid crystal panel manufactured by Google Inc., and the in-plane retardation value of the liquid crystal cell was measured at a wavelength of 590 nm, and it was 355 nm. Next, the polarizing plate A is bonded to the visible side of the taken-out liquid crystal cell through the adhesive A, and the polarizing plate B is bonded to the back side through the adhesive A to manufacture a liquid crystal panel. The liquid crystal panel fabricated in this way was mounted on the Nexus 7 and the image of the image was displayed on the screen, and it was confirmed whether it was visible under external light. As a result, at an illuminance of 5000 Lux, visibility is significantly reduced and image recognition becomes difficult.

[Example 2-1]

(Manufacturing of visual recognition side polarizing plate 2-1)

Stick the adhesive B on the surface of the protective film C of the polarizing plate A. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/4 plate (1) is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate (1). Set the angle between the absorption axis of the polarizing plate and the λ/4 plate (1)) to be 45° (when viewing the protective film C from the protective film A, the λ/4 plate is arranged so that the absorption axis of the polarizing plate becomes 45° (1)) The method of fitting. Finally, the adhesive A is attached to the λ/4 plate (1) surface of the polarizing plate A. At this time, corona treatment was also performed on the bonding surface of the λ/4 plate (1) surface and the adhesive A. In this way, the viewing side polarizing plate 2-1 is manufactured.

(Manufacturing of back side polarizing plate 2-1)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/2 plate (1) is laminated on the adhesive B side of the polarizing plate B manufactured. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/2 plate (1). The angle between the absorption axis of the polarizing plate and the λ/2 plate (1) is 45° (when viewing the protective film B from the protective film C, the λ/2 plate is arranged so that the absorption axis of the polarizing plate becomes -45° ( 1)) The method of fitting.

Furthermore, the adhesive B was bonded to the λ/2 plate (1) surface of the polarizing plate B. At this time, the λ/2 plate (1) surface of the polarizing plate B and the bonding surface of the adhesive B were also corona treated. Next, the positive C plate 5 is attached to the adhesive B surface of the polarizing plate B. At this time, the corona treatment was also performed on the bonding surface of the adhesive B surface and the positive C plate 5.

Finally, the adhesive A is attached to the positive C plate 5 surface of the polarizing plate B. At this time, corona treatment was also performed on the bonding surface of the positive C plate 5 surface and the adhesive A. In this way, the back side polarizing plate 2-1 is manufactured.

The manufactured visibility-side polarizing plate 2-1 and the back-side polarizing plate 2-1 were cut into a size of 155 mm in the vertical direction×96 mm in the horizontal direction. At this time, they were cut so that the absorption axis of each polarizing plate became 90° with respect to the longitudinal direction.

The viewing side polarizing plate 2-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell B was drawn, and the back side polarizing plate 2-1 was bonded to the glass surface of the reverse surface to produce a pseudo liquid crystal panel. The shaft structure at this time is shown in Figure 3(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 2-2]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 2-3]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 2-4]

Except having changed the protective film A of the viewing-side polarizing plate 2-1 to the protective film D, it carried out similarly to Example 2-1, and manufactured the pseudo liquid crystal panel.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 2-5]

Except for changing the positive C plate 5 to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-4.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 2-6]

Except for changing the positive C plate 5 to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-4.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 2-7]

(Manufacturing of polarizing plate 2-2 on the back side)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the positive C plate 5 is attached to the adhesive B surface of the polarizing plate B manufactured. At this time, the bonding surface of the adhesive B and the positive C plate 5 is corona treated. Furthermore, the adhesive B was bonded to the positive C plate 5 surface of the polarizing plate B. At this time, the surface of the positive C plate 5 of the polarizing plate B and the bonding surface of the adhesive B were also corona treated. Next, the λ/2 plate (1) is bonded to the adhesive B surface of the polarizing plate B. At this time, corona treatment was also applied to the bonding surface of the adhesive B surface and the λ/2 plate (1). Take the angle between the absorption axis of the polarizer and the λ/2 plate (1) to be 45° (when viewing the protective film B from the protective film C, set the λ/2 plate (1) to -45° with respect to the absorption axis of the polarizer. The method of configuration) fits. Finally, the adhesive A is attached to the λ/2 plate (1) surface of the polarizing plate B. At this time, corona treatment was also performed on the bonding surface of the λ/2 plate (1) surface and the adhesive A. In this way, the back side polarizing plate 2-2 is manufactured.

The manufactured viewing side polarizing plate 2-1 and the back side polarizing plate 2-2 were cut into a size of 155 mm in the vertical direction × 96 mm in the horizontal direction. At this time, the absorption axis of each polarizing plate was cut so as to be 90° with respect to the longitudinal direction.

The viewing side polarizing plate 2-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell B was drawn, and the back side polarizing plate 2-2 was bonded to the glass surface of the reverse surface to manufacture a pseudo liquid crystal panel. The shaft structure at this time is shown in Figure 3(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 2-8]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 2-9]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 2-10]

Except that the protective film A of the recognition-side polarizing plate 1 was changed to the protective film D, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 2-11]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-10.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 2-12]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 2-10.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 3-1]

(Manufacturing of visual recognition side polarizing plate 3-1)

Stick the adhesive B on the surface of the protective film C of the polarizing plate A. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/4 plate (2) is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate (2). Take the angle between the absorption axis of the polarizer and the λ/4 plate (2) to be 45° (when viewing the protective film C from the protective film A, set the λ/4 plate (2) to 45° relative to the absorption axis of the polarizer. Way of configuration).

Furthermore, the adhesive B is attached to the λ/4 plate (2) surface of the polarizing plate A. At this time, the λ/4 plate (2) surface of the polarizing plate A and the bonding surface of the adhesive B were also corona treated. Next, the positive C plate 5 is attached to the adhesive B surface of the polarizing plate A. At this time, the corona treatment was also performed on the bonding surface of the adhesive B surface and the positive C plate 5.

Finally, the adhesive A is attached to the positive C plate 5 surface of the polarizing plate A. At this time, corona treatment was also performed on the bonding surface of the positive C plate 5 surface and the adhesive A. In this way, the viewing side polarizing plate 3-1 is manufactured.

(Manufacturing of back side polarizing plate 3-1)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/2 plate (2) is laminated on the adhesive B side of the polarizing plate B manufactured. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/2 plate (2). Take the angle between the absorption axis of the polarizing plate and the λ/2 plate (2) to be 45° (when viewing the protective film B from the protective film C, set the λ/2 plate (2) to -45° with respect to the absorption axis of the polarizing plate The method of configuration) fits. Finally, stick the adhesive A on the λ/2 plate (2) surface of the polarizing plate B. At this time, corona treatment was also performed on the surface of the λ/2 plate (2) and the bonding surface of the adhesive A. In this way, the back side polarizing plate 3-1 is manufactured.

The manufactured viewing side polarizing plate 3-1 and the back side polarizing plate 3-1 were cut into a size of 155 mm in the vertical direction × 96 mm in the horizontal direction. At this time, the absorption axis of each polarizing plate was cut so as to be 90° with respect to the longitudinal direction.

The viewing side polarizing plate 3-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell C was drawn, and the back side polarizing plate 3-1 was bonded to the glass surface of the reverse surface to manufacture a pseudo liquid crystal panel. At this time, the shaft configuration is shown in Figure 5(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 3-2]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 3-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 3-3]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 3-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 3-4]

Except that the protective film A of the viewing-side polarizing plate 3-1 was changed to the protective film D, the pseudo liquid crystal panel was manufactured in the same manner as in Example 3-1.

The simulated liquid crystal panel fabricated in this way was placed on the fabricated backlight panel, and it was confirmed whether the image could be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 3-5]

Except that the positive C-plate 5 was changed to the positive C-plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 3-4.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 3-6]

Except for changing the positive C-plate 5 to the positive C-plate 7, an analog liquid crystal panel was manufactured in the same manner as in Example 3-4.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 3-7]

(Manufacturing of visual recognition side polarizing plate 3-2)

Stick the adhesive B on the surface of the protective film C of the polarizing plate A. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the positive C plate 5 is layered on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the 5 surface of the positive C plate. Furthermore, the adhesive B was attached to the positive C plate 5 surface of the polarizing plate A. At this time, the surface of the positive C plate 5 of the polarizing plate A and the bonding surface of the adhesive B were also corona treated. Next, the λ/4 plate (2) is attached to the adhesive B surface of the polarizing plate A. At this time, corona treatment was also applied to the bonding surface of the adhesive B surface and the λ/4 plate (2). Set the angle between the absorption axis of the polarizing plate and the λ/4 plate (2) to be 45° (when viewing the protective film C from the protective film A, set the λ/4 plate (2) to 45° with respect to the absorption axis of the polarizing plate Configuration) fit.

Finally, the adhesive A is attached to the λ/4 plate (2) surface of the polarizing plate A. At this time, corona treatment was also performed on the surface of the λ/4 plate (2) and the bonding surface of the adhesive A. In this way, the viewing side polarizing plate 3-2 is manufactured.

The manufactured viewing side polarizing plate 3-2 and the back side polarizing plate 3-1 were cut into a size of 155 mm in the vertical direction × 96 mm in the horizontal direction. At this time, the absorption axis of each polarizing plate was cut so as to be 90° with respect to the longitudinal direction.

The viewing side polarizing plate 3-2 was bonded to the glass surface on which the image of the pseudo liquid crystal cell C was drawn, and the back side polarizing plate 3-1 was bonded to the glass surface on the reverse side to manufacture a pseudo liquid crystal panel. At this time, the shaft configuration is shown in Figure 5(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 3-8]

Except for changing the positive C-plate 5 to the positive C-plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 3-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 3-9]

Except that the positive C-plate 5 was changed to the positive C-plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 3-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 3-10]

Except having changed the protective film A of the viewing side polarizing plate 3-2 to the protective film D, it carried out similarly to Example 3-7, and manufactured the pseudo liquid crystal panel.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 3-11]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 3-10.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 3-12]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 3-10.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 4-1]

(Manufacturing of visual recognition side polarizing plate 4-1)

Stick the adhesive B on the surface of the protective film C of the polarizing plate A. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/4 plate (1) is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate (1). Take the angle between the absorption axis of the polarizing plate and the λ/4 plate (1)) to be 45° (when viewing the protective film C from the protective film A, set the slow axis of the λ/4 plate (1) relative to the absorption of the polarizing plate The shaft rotates counterclockwise to become a 45° method of placement). Furthermore, the adhesive A is bonded to the λ/4 plate (1) surface of the polarizing plate A. At this time, corona treatment was also performed on the bonding surface of the λ/4 plate (1) surface and the adhesive A. In this way, the viewing side polarizing plate 4-1 was produced.

(Manufacturing of back side polarizing plate 4-1)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the positive C plate 1 is laminated on the adhesive B side of the polarizing plate A to be manufactured. At this time, corona treatment was performed on the bonding surface of the adhesive B and the positive C plate 1. Furthermore, the adhesive B was attached to the positive C plate 1 surface of the polarizing plate A. At this time, the surface of the positive C plate 1 of the polarizing plate A and the bonding surface of the adhesive B were also corona treated. Next, the λ/2 plate (1) is bonded to the adhesive B surface of the polarizing plate A. At this time, corona treatment was also applied to the bonding surface of the adhesive B surface and the λ/2 plate (1). Take the angle between the absorption axis of the polarizing plate and the λ/2 plate (1) to be 45° (when viewing the protective film B from the protective film C, set the slow axis of the λ/2 plate (1) relative to the absorption axis of the polarizing plate Become a 45° clockwise rotation configuration) method of bonding. Finally, the adhesive A is attached to the λ/2 plate (1) surface of the polarizing plate B. At this time, corona treatment was also performed on the surface of the λ/2 plate (1) and the bonding surface of the adhesive A. In this way, the back side polarizing plate 4-1 was manufactured.

The manufactured viewing side 4-1 and the back side polarizing plate 4-1 were cut into a size of 155 mm in the vertical direction×96 mm in the horizontal direction. At this time, when viewing the protective film A of the viewing-side polarizing plate 4-1 or the protective film B of the back-side polarizing plate 4-1 as the upper side, the absorption axis of each polarizing plate becomes 45° with respect to the longitudinal direction. Adjudication.

The visual recognition side polarizing plate 4-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell D was drawn, and the back side polarizing plate 4-1 was bonded to the glass surface on the reverse side to manufacture a pseudo liquid crystal panel. The shaft structure at this time is shown in Figure 6(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 4-2]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 4-3]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-1.

The simulated liquid crystal panel fabricated in this way was placed on the fabricated backlight panel, and it was confirmed whether the image could be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 4-4]

Except that the positive C plate 1 was changed to the positive C plate 4, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 4-5]

Except that the protective film A of the viewing-side polarizing plate 4-1 was changed to the protective film D, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 4-6]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-5.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 4-7]

Except that the positive C plate 1 was changed to the positive C plate 3, a pseudo liquid crystal panel was manufactured in the same manner as in Example 4-5.

The simulated liquid crystal panel fabricated in this way was placed on the fabricated backlight panel, and it was confirmed whether the image could be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 4-8]

Except that the positive C plate 1 was changed to the positive C plate 4, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-5.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 4-9]

(Manufacturing of the back side polarizing plate 4-2)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/2 plate (1) is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/2 plate (1). Take the angle between the absorption axis of the polarizing plate and the λ/2 plate (1) to be 45° (when viewing the protective film B from the protective film C, set the slow axis of the λ/2 plate (1) relative to the absorption axis of the polarizing plate Become a 45° clockwise rotation configuration) method of bonding. Furthermore, the adhesive B is attached to the λ/2 plate (1) surface of the polarizing plate A. At this time, the λ/2 plate (1) surface of the polarizing plate A and the bonding surface of the adhesive B were also corona treated. Next, the positive C plate 1 is attached to the adhesive B surface of the polarizing plate A. At this time, corona treatment was also applied to the bonding surface of the adhesive B surface and the positive C plate 1. Finally, the adhesive A is attached to the positive C plate 1 surface of the polarizing plate A. At this time, corona treatment was also performed on the surface of the positive C plate 1 and the bonding surface of the adhesive A. In this way, the back side polarizing plate 4-2 was produced.

The manufactured viewing side 4-1 and the back side polarizing plate 4-2 were cut into a size of 155 mm in the vertical direction×96 mm in the horizontal direction. At this time, when viewing the protective film A of the viewing-side polarizing plate 4-1 or the protective film B of the back-side polarizing plate 4-2 as the upper side, the absorption axis of each polarizing plate becomes 45° with respect to the longitudinal direction. Adjudication.

The viewing side polarizing plate 4-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell D was drawn, and the back side polarizing plate 4-2 was bonded to the glass surface of the reverse surface to manufacture a pseudo liquid crystal panel. The shaft structure at this time is shown in Figure 6(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 4-10]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-9.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 4-11]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-9.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 4-12]

Except that the positive C plate 1 was changed to the positive C plate 4, a pseudo liquid crystal panel was manufactured in the same manner as in Example 4-9.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 4-13]

Except having changed the protective film A of the visibility-side polarizing plate 4-1 to the protective film D, it carried out similarly to Example 4-9, and manufactured the pseudo liquid crystal panel.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 4-14]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-13.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 4-15]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was manufactured in the same manner as in Example 4-13.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 4-16]

Except that the positive C plate 1 was changed to the positive C plate 4, a pseudo liquid crystal panel was manufactured in the same manner as in Example 4-13.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 5-1]

(Manufacturing of visual recognition side polarizing plate 5-1)

Stick the adhesive B on the surface of the protective film C of the polarizing plate A. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/4 plate (1) is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate (1). Take the angle between the absorption axis of the polarizing plate and the λ/4 plate (1)) to be 45° (when viewing the protective film C from the protective film A, set the slow axis of the λ/4 plate (1) relative to the absorption of the polarizing plate The shaft rotates counterclockwise to become a 45° method of placement). Furthermore, the adhesive A was attached to the surface of the λ/4 plate (1) of the polarizing plate A. At this time, corona treatment was also performed on the bonding surface of the λ/4 plate (1) surface and the adhesive A. In this way, the viewing side polarizing plate 5-1 is manufactured.

(Manufacturing of Polarizing Plate 5-1 on the Back Side)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the positive C plate 5 is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, the bonding surface of the adhesive B and the positive C plate 5 is corona treated. Furthermore, the adhesive B was attached to the positive C plate 5 surface of the polarizing plate A. At this time, the bonding surface of the positive C plate 5 of the polarizing plate A and the adhesive B was also corona treated. Next, the λ/2 plate (1) is bonded to the adhesive B surface of the polarizing plate A. At this time, corona treatment was also applied to the bonding surface of the adhesive B surface and the λ/2 plate (1). Take the angle between the absorption axis of the polarizing plate and the λ/2 plate (1) to be 45° (when viewing the protective film B from the protective film C, set the slow axis of the λ/2 plate (1) relative to the absorption axis of the polarizing plate Become a 45° clockwise rotation configuration) method of bonding. Finally, stick the adhesive A on the λ/2 plate (1) surface of the polarizing plate A. At this time, corona treatment was also performed on the surface of the λ/2 plate (1) and the bonding surface of the adhesive A. In this way, the back side polarizing plate 5-1 is manufactured.

The manufactured viewing side polarizing plate 5-1 and the back side polarizing plate 5-1 were cut into a size of 155 mm in the vertical direction×96 mm in the horizontal direction. At this time, when viewing the protective film A of the viewing-side polarizing plate 5-1 or the protective film B of the back-side polarizing plate 5-1 as the upper side, the absorption axis of each polarizing plate becomes 45° with respect to the longitudinal direction Judging separately.

The viewing side polarizing plate 5-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell was drawn, and the back side polarizing plate 5-1 was bonded to the glass surface on the reverse side to manufacture a pseudo liquid crystal panel. The shaft structure at this time is shown in Figure 6(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 5-2]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 5-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 5-3]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 5-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 5-4]

Except having changed the protective film A of the viewing side polarizing plate 5-1 to the protective film D, it carried out similarly to Example 5-1, and manufactured the pseudo liquid crystal panel.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 5-5]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 5-4.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 5-6]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 5-4.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 5-7]

(Manufacturing of 5-2 Polarizing Plate on the Back Side)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/2 plate (1) is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/2 plate (1). Take the angle between the absorption axis of the polarizing plate and the λ/2 plate (1) to be 45° (when viewing the protective film B from the protective film C, set the slow axis of the λ/2 plate (1) relative to the absorption axis of the polarizing plate Become a 45° clockwise rotation configuration) method of bonding. Furthermore, the adhesive B was bonded to the λ/2 plate (1) surface of the polarizing plate A. At this time, the λ/2 plate (1) surface of the polarizing plate A and the bonding surface of the adhesive B were also corona treated. Next, the positive C plate 5 is attached to the adhesive B surface of the polarizing plate A. At this time, corona treatment is also applied to the bonding surface of the adhesive B surface and the positive C plate 5. Finally, the adhesive A is attached to the positive C plate 5 surface of the polarizing plate A. At this time, corona treatment was also performed on the bonding surface of the positive C plate 5 surface and the adhesive A. In this way, the back side polarizing plate 5-2 was manufactured.

The manufactured viewing side polarizing plate 5-1 and the back side polarizing plate 5-2 were cut into a size of 155 mm in the vertical direction×96 mm in the horizontal direction. At this time, when viewing the protective film A of the viewing-side polarizing plate 5-1 or the protective film B of the back-side polarizing plate 5-2 as the upper side, the absorption axis of each polarizing plate becomes 45° with respect to the longitudinal direction. Adjudication.

The viewing side polarizing plate 5-1 was bonded to the glass surface on which the image of the pseudo-liquid crystal cell was drawn, and the back side polarizing plate 5-2 was bonded to the glass surface of the reverse surface to manufacture a pseudo-liquid crystal panel. The shaft structure at this time is shown in Figure 6(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 5-8]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 5-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 5-9]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 5-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 5-10]

Except having changed the protective film A of the side polarizing plate 5-1 to the protective film D, it carried out similarly to Example 5-7, and manufactured the pseudo liquid crystal panel.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 5-11]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 5-10.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 5-12]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 5-10.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 6-1]

(Manufacturing of visual recognition side polarizing plate 6-1)

Stick the adhesive B on the surface of the protective film C of the polarizing plate A. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the positive C plate 5 is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, the bonding surface of the adhesive B and the positive C plate 5 is corona treated. Furthermore, the adhesive B was attached to the positive C plate 5 surface of the polarizing plate A. At this time, the bonding surface of the positive C plate 5 of the polarizing plate A and the adhesive B was also corona treated. Next, the λ/4 plate (3) is bonded to the adhesive B surface of the polarizing plate A. At this time, corona treatment was also applied to the bonding surface of the adhesive B surface and the λ/4 plate (3). The angle between the absorption axis of the polarizing plate and the λ/4 plate (3) is 45° (when viewing the protective film C from the protective film A, the slow axis of the λ/4 plate (3) is reversed from the absorption axis of the polarizing plate The way the hour hand rotates 45°) is fitted. Finally, the adhesive A is attached to the λ/4 plate (3) surface of the polarizing plate A. At this time, corona treatment was also performed on the bonding surface of the λ/4 plate (3) and the adhesive A. In this way, the viewing side polarizing plate 6-1 was produced.

(Manufacturing of Polarizing Plate 6-1 on the Back Side)

Stick the adhesive B on the C surface of the protective film of the polarizing plate B. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, the λ/2 plate (2) is laminated on the adhesive B side of the polarizing plate B manufactured. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/2 plate (2). Take the angle between the absorption axis of the polarizing plate and the λ/2 plate (2)) to be 45° (when viewing the protective film C from the protective film B, set the slow axis of the λ/2 plate (2) relative to the absorption of the polarizing plate The shaft is arranged in a counterclockwise rotation of 45°). Furthermore, the adhesive A was attached to the surface of the λ/2 plate (2) of the polarizing plate B. At this time, the λ/2 plate (2) surface of the polarizing plate A and the bonding surface of the adhesive A were corona treated. In this way, the back side polarizing plate 6-1 was manufactured.

The manufactured viewing side polarizing plate 6-1 and the back side polarizing plate 6-1 were cut into a size of 155 mm in the vertical direction × 96 mm in the horizontal direction. At this time, when viewing the protective film A of the viewing-side polarizing plate 6-1 or the protective film B of the back-side polarizing plate 6-1 as the upper side, the absorption axis of each polarizing plate becomes 45° with respect to the longitudinal direction. Adjudication.

The viewing side polarizing plate 6-1 was bonded to the glass surface on which the image of the pseudo liquid crystal cell E was drawn, and the back side polarizing plate 6-1 was bonded to the glass surface of the reverse surface to manufacture a pseudo liquid crystal panel. At this time, the shaft configuration is as shown in Figure 7(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 6-2]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 6-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 6-3]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 6-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 6-4]

Except that the protective film of the viewing-side polarizing plate 6-1 was changed to the protective film D, a pseudo liquid crystal panel was produced in the same manner as in Example 6-1.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 6-5]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 6-4.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 6-6]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 6-4.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 6-7]

(Manufacturing of visual recognition side polarizing plate 6-2)

Stick the adhesive B on the surface of the protective film C of the polarizing plate A. At this time, corona treatment was performed on the bonding surface of the protective film C surface and the adhesive B. Next, a positive λ/4 plate (3) is laminated on the adhesive B side of the manufactured polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate (3). Take the angle between the absorption axis of the polarizing plate and the λ/4 plate (3) to be 45° (when viewing the protective film C from the protective film B, set the slow axis of the λ/4 plate (3) relative to the absorption axis of the polarizing plate Become a 45° counterclockwise rotation configuration) method of bonding. Furthermore, the adhesive B is attached to the λ/4 plate (3) surface of the polarizing plate A. Next, the positive C plate 5 is attached to the adhesive B surface of the polarizing plate A. At this time, corona treatment is also applied to the bonding surface of the adhesive B surface and the positive C plate 5. Finally, the adhesive A is attached to the positive C plate 5 surface of the polarizing plate A. At this time, corona treatment was also performed on the bonding surface of the positive C plate 5 surface and the adhesive A. In this way, the viewing side polarizing plate 6-2 is manufactured.

The manufactured viewing side polarizing plate 6-2 and the back side polarizing plate 6-1 were cut into a size of 155 mm in the vertical direction×96 mm in the horizontal direction. At this time, when viewing the protective film A of the viewing-side polarizing plate 6-1 or the protective film B of the back-side polarizing plate 6-1 as the upper side, the absorption axis of each polarizing plate becomes 45° with respect to the longitudinal direction. Adjudication.

The viewing side polarizing plate 6-2 was bonded to the glass surface on which the image of the pseudo-liquid crystal cell E was drawn, and the back side polarizing plate 6-1 was bonded to the glass surface of the reverse surface to manufacture a pseudo-liquid crystal panel. At this time, the shaft configuration is as shown in Figure 7(b).

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 6-8]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 6-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 6-9]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 6-7.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 7500 Lux.

[Example 6-10]

Except having changed the protective film A of the viewing-side polarizing plate 2 to the protective film D, it carried out similarly to Example 6-7, and manufactured the pseudo liquid crystal panel.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 6-11]

Except that the positive C plate 5 was changed to the positive C plate 6, the pseudo liquid crystal panel was manufactured in the same manner as in Example 6-10.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Example 6-12]

Except that the positive C plate 5 was changed to the positive C plate 7, the pseudo liquid crystal panel was manufactured in the same manner as in Example 6-10.

The simulated liquid crystal panel fabricated in this way is placed on the fabricated backlight panel, and it is confirmed whether the image can be seen or not. When the visibility is confirmed under external light, the visibility is good even at 10000 Lux.

[Industrial availability]

The polarizing plate assembly of the present invention is useful because it can provide a liquid crystal display device that can suppress the reflection of external light and can ensure good visibility even in an environment with strong external light.

1‧‧‧The absorption axis of the polarizer

2‧‧‧Lagging axis of λ/4 plate

3‧‧‧The initial alignment direction of the liquid crystal cell

The slow axis of 4‧‧‧λ/2

5‧‧‧The absorption axis of the polarizer

30、50‧‧‧ Polarizing plate

35‧‧‧λ/4 plate

54‧‧‧Positive C Plate

55‧‧‧λ/2 plate

60‧‧‧LCD unit

Claims (34)

A polarizing plate group comprising a polarizing plate on the viewing side and a polarizing plate on the back side, which are used to be respectively attached to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 100nm to 200nm, wherein the aforementioned viewing side polarizer The absorption axis of the plate is approximately orthogonal to the absorption axis of the back-side polarizing plate. The visible-side polarizing plate has a first polarizer and a λ/4 plate. The λ/4 plate is arranged between the first polarizer and the liquid crystal cell. The angle between the absorption axis of the visible side polarizer and the slow axis of the λ/4 plate is approximately 45°, the back side polarizer has a second polarizer and a λ/2 plate, and the λ/2 plate is arranged in Between the second polarizer and the liquid crystal cell, the angle between the absorption axis of the back-side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, and the slow axis of the λ/4 plate is approximately equal to the aforementioned λ/ The slow axis of the two plates are roughly parallel, the Nz coefficient of the λ/4 plate is -0.5 or more and 0.5 or less, and the slow axis of the λ/4 plate is arranged to be roughly orthogonal to the initial alignment direction of the IPS mode liquid crystal cell relationship. The polarizing plate set according to the first item of the scope of patent application, wherein the back side polarizing plate includes a positive C plate arranged between the second polarizing plate and the λ/2 plate. The polarizing plate set according to the first item of the scope of patent application, wherein the back side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/2 plate. According to the polarizing plate set described in item 2 or 3 of the scope of patent application, the thickness direction of the positive C plate has a retardation value of -150nm to -250nm. An IPS mode liquid crystal display device is formed by arranging the polarizing plate group described in any one of items 1 to 4 of the scope of patent application in an IPS mode liquid crystal cell with an in-plane phase difference of 100 nm to 200 nm. According to the IPS mode liquid crystal display device described in item 5 of the scope of patent application, the size of the IPS mode liquid crystal display device is less than 15 inches diagonally. A polarizing plate group comprising a polarizing plate on the viewing side and a polarizing plate on the back side, which are used to be respectively attached to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 100nm to 200nm, wherein the aforementioned viewing side polarizer The absorption axis of the plate is approximately parallel to the absorption axis of the back-side polarizing plate, the visible side polarizing plate has a first polarizer and a λ/4 plate, and the λ/4 plate is arranged between the first polarizer and the liquid crystal cell The angle between the absorption axis of the visible side polarizing plate and the slow axis of the λ/4 plate is approximately 45°, the back side polarizing plate has a second polarizer and a λ/2 plate, and the λ/2 plate is arranged on the The second polarizer and the aforementioned liquid crystal cell In between, the angle between the absorption axis of the back-side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, and the slow axis of the λ/4 plate is approximately orthogonal to the slow axis of the λ/2 plate. The Nz coefficient of the λ/4 plate is -0.5 or more and 0.5 or less, and the slow axis system of the λ/4 plate is arranged in a substantially orthogonal relationship to the initial alignment direction of the IPS mode liquid crystal cell. The polarizing plate set according to the seventh item of the scope of patent application, wherein the back side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/2 plate. The polarizing plate set according to the seventh item of the scope of patent application, wherein the back side polarizing plate includes a positive C plate arranged between the polarizing plate and the λ/2 plate. According to the polarizing plate set described in item 8 or 9 of the scope of patent application, the phase difference in the thickness direction of the positive C plate is from -50 nm to -150 nm. An IPS mode liquid crystal display device is formed by arranging the polarizing plate group described in any one of items 7 to 10 in the scope of patent application in an IPS mode liquid crystal cell with an in-plane phase difference of 100 nm to 200 nm. In the IPS mode liquid crystal display device described in item 11 of the scope of patent application, the size of the IPS mode liquid crystal display device is 15 inches or less diagonally. A polarizing plate group, which includes a visual recognition side polarizing plate and a back side polarizing plate, which are respectively attached to the in-plane retardation value of 100nm to 200nm The polarizing plate group on both sides of the IPS mode liquid crystal cell, wherein the absorption axis of the visible side polarizing plate is approximately parallel to the absorption axis of the back side polarizing plate, and the visible side polarizing plate has a first polarizer and a λ/4 plate. The λ/4 plate is arranged between the first polarizer and the liquid crystal cell, the angle between the absorption axis of the visible side polarizer and the slow axis of the λ/4 plate is approximately 45°, and the back side polarizer has a second 2 Polarizer and λ/2 plate, the λ/2 plate is arranged between the second polarizer and the liquid crystal cell, and the angle between the absorption axis of the back-side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, the slow axis of the λ/4 plate and the slow axis of the λ/2 plate are roughly text, the Nz coefficient of the λ/2 plate is -0.5 or more and 0.5 or less, the slow axis of the λ/4 plate The system is arranged so that the initial alignment direction of the aforementioned IPS mode liquid crystal cell is substantially orthogonal. The polarizing plate set according to the 13th patent application, wherein the visible side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/4 plate. The polarizing plate set according to the scope of patent application item 13, wherein the visible side polarizing plate includes a positive C plate arranged between the polarizing plate and the λ/4 plate. The polarizing plate set according to item 14 or 15 of the scope of patent application, wherein the thickness direction of the positive C plate has a retardation value of -50 nm to -150 nm. An IPS mode liquid crystal display device is formed by arranging the polarizing plate group described in any one of items 13 to 16 in the scope of patent application in an IPS mode liquid crystal cell with an in-plane phase difference of 100 nm to 200 nm. For the IPS mode liquid crystal display device described in item 17 of the scope of patent application, the size of the IPS mode liquid crystal display device is 15 inches or less diagonally. A polarizing plate group comprising a polarizing plate on the viewing side and a polarizing plate on the back side, which are used to be respectively attached to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 400nm to 500nm, wherein the aforementioned viewing side polarizer The absorption axis of the plate is approximately orthogonal to the absorption axis of the back-side polarizing plate. The visible-side polarizing plate has a first polarizer and a λ/4 plate. The λ/4 plate is arranged between the first polarizer and the liquid crystal cell. The angle between the absorption axis of the visible side polarizer and the slow axis of the λ/4 plate is approximately 45°, the back side polarizer has a second polarizer and a λ/2 plate, and the λ/2 plate is arranged in Between the second polarizer and the liquid crystal cell, the angle between the absorption axis of the back-side polarizing plate and the slow axis of the λ/2 plate is approximately 45°, and the slow axis of the λ/4 plate is approximately equal to the aforementioned λ/ The slow phase axis of the 2 plate is roughly flat Therefore, the Nz coefficient of the λ/4 plate is -0.5 or more and 0.5 or less, and the slow phase axis of the λ/4 plate is arranged in a substantially parallel relationship with the initial alignment direction of the IPS mode liquid crystal cell. The polarizing plate set described in claim 19, wherein the back side polarizing plate includes a positive C plate arranged between the second polarizing plate and the λ/2 plate. The polarizing plate set described in claim 19, wherein the back side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/2 plate. According to the polarizing plate set described in item 20 or 21 of the scope of patent application, the phase difference in the thickness direction of the positive C plate is -150nm to -250nm. An IPS mode liquid crystal display device is formed by arranging the polarizing plate group described in any one of the 19th to 22nd patent applications in an IPS mode liquid crystal cell with an in-plane phase difference of 400nm to 500nm. The IPS mode liquid crystal display device described in item 23 of the scope of patent application, wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally. A polarizing plate group comprising a polarizing plate on the viewing side and a polarizing plate on the back side, which are used to be respectively attached to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 400nm to 500nm, wherein the aforementioned viewing side polarizer The absorption axis of the plate is roughly orthogonal to the absorption axis of the back-side polarizing plate, The viewing side polarizing plate has a first polarizer and a λ/4 plate, the λ/4 plate is arranged between the first polarizing plate and the liquid crystal cell, and the absorption axis of the viewing side polarizing plate and the λ/4 plate The angle between the slow axis is approximately 45°, the back side polarizing plate has a second polarizer, a λ/2 plate, and a positive C plate. The λ/2 plate is arranged between the second polarizer and the liquid crystal cell. The angle between the absorption axis of the back-side polarizing plate and the slow axis of the aforementioned λ/2 plate is approximately 45°, and the retardation in the thickness direction of the aforementioned positive C plate is from -50 nm to -150 nm. The axis is roughly parallel to the slow axis of the λ/2 plate, the Nz coefficient of the λ/4 plate is -0.5 or more and 0.5 or less, and the slow axis of the λ/4 plate is arranged as the initial phase of the IPS mode liquid crystal cell. The alignment directions are roughly parallel. The polarizing plate set described in claim 25, wherein the positive C plate is arranged between the second polarizer and the λ/2 plate. The polarizing plate set as described in item 25 of the scope of patent application, wherein the positive C plate is arranged between the liquid crystal cell and the λ/2 plate. An IPS mode liquid crystal display device in which the polarizing plate group described in any one of the 25th to 27th items of the patent application is arranged on the in-plane phase difference value It is made of IPS mode liquid crystal cells from 400nm to 500nm. The IPS mode liquid crystal display device described in item 28 of the scope of patent application, wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally. A polarizing plate group, which includes a polarizing plate on the viewing side and a polarizing plate on the back side, which is used to be respectively attached to both sides of an IPS mode liquid crystal cell with an in-plane phase difference of 400nm to 500nm, wherein the aforementioned viewing side polarizer The absorption axis of the plate is approximately orthogonal to the absorption axis of the back-side polarizing plate. The visible-side polarizing plate has a first polarizer, a λ/4 plate, and a positive C plate. The λ/4 plate is arranged between the first polarizer and the Between the liquid crystal cells, the angle between the absorption axis of the visibility side polarizing plate and the slow axis of the λ/4 plate is approximately 45°, the back side polarizing plate has a second polarizer and a λ/2 plate, and the λ/ The two plates are arranged between the second polarizer and the liquid crystal cell, the angle between the absorption axis of the back side polarizer and the slow axis of the λ/2 plate is approximately 45°, and the phase of the positive C plate in the thickness direction The difference is -50nm to -150nm, the slow axis of the aforementioned λ/4 plate is roughly parallel to the slow axis of the aforementioned λ/2 plate, The Nz coefficient of the λ/2 plate is -0.5 or more and 0.5 or less, and the slow axis system of the λ/4 plate is arranged in a substantially parallel relationship with the initial alignment direction of the IPS mode liquid crystal cell. The polarizing plate set according to the 30th patent application, wherein the positive C plate is arranged between the first polarizer and the λ/4 plate. The polarizing plate set according to the 30th patent application, wherein the positive C plate is arranged between the liquid crystal cell and the λ/4 plate. An IPS mode liquid crystal display device is formed by arranging the polarizing plate group described in any one of the 30 to 32 patent applications in an IPS mode liquid crystal cell with an in-plane phase difference of 400 nm to 500 nm. The IPS mode liquid crystal display device described in item 33 of the scope of patent application, wherein the size of the IPS mode liquid crystal display device is 15 inches or less diagonally.

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