TWI708966B - Polarizing plate set and ips mode liquid crystal display device using the same - Google Patents

Abstract

An object of the present invention is to provide a polarizing plate set for specific IPS mode liquid crystal cell which is 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 polarizing plate set comprises a viewing side polarizing plate and a back side polarizing plate for respectively being adhered to both sides of an IPS mode liquid crystal cell having an in-plane retardation value of 100 nm to 200 nm, wherein the absorption axis of the viewing side polarizing plate and the absorption axis of the back side polarizing plate are substantially orthogonal to each other, the viewing side polarizing plate has a polarizer and a λ/4 plate, the angle between the absorption axis of the viewing side polarizing plate and the slow axis of the λ/4 plate is approximately 45°, and the slow axis of the λ/4 plate is disposed in such a relationship as to substantially orthogonal to the initial alignment direction of the IPS mode liquid crystal cell.

Description

Set of polarizing plate and IPS mode liquid crystal display device using the set

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

In recent years, low-power consumption, low-voltage operation, lightweight and thin liquid crystal displays have rapidly become popular as information display devices such as mobile phones, personal digital assistants, computer screens, and televisions. With the development of liquid crystal technology, various types of liquid crystal displays have been proposed, and the so-called liquid crystal display problems such as response speed, contrast, and narrow viewing angle have been continuously solved.

With the increasing opportunities for using mobile phones and personal digital assistants outdoors, when the external light such as sunlight is strong, the liquid crystal display device with the conventional liquid crystal unit and the conventional polarizing plate set has the problem of strong reflection of external light and difficult to see the LCD screen. .

As a countermeasure to this problem, a general example is to provide a low reflection layer on the surface of the viewing side polarizing plate to reduce external light reflection, or to use a circular polarizing plate on the viewing side polarizing plate as a countermeasure to reduce external light reflection.

But only with the aforementioned low reflection layer, the visibility will be significantly reduced in an environment where the external light intensity exceeds 5000 lux. Also, in the IPS mode LCD In general, the in-plane retardation value is 250 nm to 380 nm, and it is difficult to arrange the circularly polarizing plate as the viewing side polarizing plate.

[Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2005-128498.

The object of the present invention is to provide a set of polarizing plates for a specific IPS mode liquid crystal cell that can ensure good visibility even in an environment with an external light intensity exceeding 5000 lux, and an IPS mode liquid crystal display device using the set.

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

[1] A set of polarizing plates, which includes a viewing side polarizing plate and a back side polarizing plate, 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. The aforementioned viewing side polarizing plate The absorption axis is slightly orthogonal to the absorption axis of the back side polarizing plate. The visible side polarizing plate has a polarizer and a λ/4 plate. The absorption axis of the visible side polarizing plate is aligned with the slow axis of the λ/4 plate. The included angle is slightly 45°, and the slow axis of the λ/4 plate is arranged in a relationship that is slightly orthogonal to the initial alignment direction of the IPS mode liquid crystal cell.

[2] The polarizing plate set as described in [1], wherein the aforementioned visual recognition side polarized light The plate includes a positive C plate arranged between the liquid crystal cell and the λ/4 plate.

[3] The set of polarizing plates as described in [1], wherein the viewing side polarizing plate includes a positive C plate arranged between the polarizing plate of the viewing side polarizing plate and the λ/4 plate.

[4] The polarizing plate set as described in [2] or [3], wherein the thickness direction of the positive C plate has a retardation value of -50 nm to -150 nm.

[5] An IPS mode liquid crystal display device, which is formed by arranging a polarizing plate set as described in any one of [1] to [4] on an IPS mode liquid crystal cell with an in-plane phase difference of 100 nm to 200 nm .

[6] The IPS mode liquid crystal display device as described in [5], wherein the size of the IPS mode liquid crystal display device is less than 15 inches diagonally.

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

[7] A set of polarizing plates, comprising a viewing side polarizing plate and a back side polarizing plate, which are used to respectively attach to both sides of an IPS mode liquid crystal cell with an in-plane retardation value of 400nm to 500nm. The aforementioned viewing side polarizing plate The absorption axis is slightly orthogonal to the absorption axis of the back-side polarizing plate, the visible side polarizing plate has a polarizer and a λ/4 plate, and the angle between the absorption axis of the visible side polarizing plate and the slow axis of the λ/4 plate Slightly 45°, the slow axis of the λ/4 plate is arranged in a relationship that is slightly parallel to the initial alignment direction of the IPS mode liquid crystal cell.

[8] The polarizing plate set as described in [7], wherein the viewing-side polarizing plate includes a positive C arranged between the liquid crystal cell and the λ/4 plate board.

[9] The set of polarizing plates as described in [7], wherein the viewing-side polarizing plate includes a positive C plate arranged between the polarizing plate and the λ/4 plate.

[10] The polarizing plate set as described in [8] or [9], wherein the thickness direction of the positive C plate has a retardation value of -50 nm to -150 nm.

[11] An IPS mode liquid crystal display device, which is formed by arranging the polarizing plate set as described in any one of [7] to [10] on an IPS mode liquid crystal cell with an in-plane phase difference of 400 nm to 500 nm.

[12] The IPS mode liquid crystal display device described in [11], wherein the size of the IPS mode liquid crystal display device is less than 15 inches diagonally.

In addition, the third embodiment of the present invention provides the following [13] to [21].

[13] A set of polarizing plates, including a viewing side polarizing plate and a back side polarizing plate, 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. The aforementioned viewing side polarizing plate The absorption axis is slightly 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 on 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 slightly 45°, the back side polarizing plate has a second polarizer and a λ/2 plate, and the back side polarizing plate is The angle between the absorption axis and the slow axis of the aforementioned λ/2 plate is slightly 45°, the slow axis of the aforementioned λ/4 plate is slightly orthogonal to the slow axis of the aforementioned λ/2 plate, and the slow axis of the aforementioned λ/4 plate is opposite The initial alignment directions of the aforementioned IPS mode liquid crystal cells are arranged in a slightly orthogonal relationship.

[14] The polarizing plate set as described in [13], wherein the visible side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/4 plate, and the back side polarizing plate includes an arrangement The positive C plate between the liquid crystal cell and the λ/2 plate.

[15] The polarizing plate set according to [13], wherein the visible side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/4 plate, and the back side polarizing plate includes an arrangement The positive C plate between the second polarizer and the λ/2 plate.

[16] The set of polarizing plates as described in [13], wherein the visible side polarizing plate includes a positive C plate arranged between the first polarizer and the λ/4 plate, and the back side polarizing plate is It contains a positive C plate arranged between the liquid crystal cell and the λ/2 plate.

[17] The set of polarizing plates as described in [13], wherein the visible side polarizing plate includes a positive C plate arranged between the first polarizer and the λ/4 plate, and the back side polarizing plate is Contains a positive C plate arranged between the second polarizer and the λ/2 plate.

[18] The polarizing plate set as described in any one of [14] to [17], wherein the positive C plate of the aforementioned visible-side polarizing plate and the positive C plate of the aforementioned back-side polarizing plate are The retardation value in the thickness direction is slightly equal.

[19] The polarizing plate set according to any one of [14] to [18], wherein the thickness direction of the positive C plate has a retardation value of -50 nm to -150 nm.

[20] An IPS mode liquid crystal display device, formed by arranging the polarizing plate set as described in any one of [13] to [19] on an IPS mode liquid crystal cell with an in-plane phase difference of 100 nm to 200 nm.

[21] The IPS mode liquid crystal display device described in [20], wherein the size of the IPS mode liquid crystal display device is less than 15 inches diagonally.

In addition, the fourth embodiment of the present invention provides the following [22] to [30].

[22] A set of polarizing plates, including a viewing side polarizing plate and a back side polarizing plate, 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. The aforementioned viewing side polarizing plate The absorption axis is slightly 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 on 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 slightly 45°, the back side polarizing plate has a second polarizer and a λ/2 plate, and the back side polarizing plate is The angle between the absorption axis and the slow axis of the aforementioned λ/2 plate is slightly 45°, the slow axis of the aforementioned λ/4 plate is slightly orthogonal to the slow axis of the aforementioned λ/2 plate, and the slow axis of the aforementioned λ/4 plate is opposite to The initial alignment directions of the aforementioned IPS mode liquid crystal cells are arranged in a slightly parallel relationship.

[23] The polarizing plate set as described in [22], wherein the visible side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/4 plate, and the back side polarizing plate includes an arrangement The positive C plate between the liquid crystal cell and the λ/2 plate.

[24] The polarizing plate set as described in [22], wherein the visible side polarizing plate includes a positive C plate arranged between the liquid crystal cell and the λ/4 plate, and the back side polarizing plate includes an arrangement The positive C plate between the second polarizer and the λ/2 plate.

[25] The set of polarizing plates according to [22], wherein the visible side polarizing plate includes a positive C plate arranged between the first polarizer and the λ/4 plate, and the back side polarizing plate is It contains a positive C plate arranged between the liquid crystal cell and the λ/2 plate.

[26] The set of polarizing plates as described in [22], wherein the visible side polarizing plate includes a positive C plate arranged between the first polarizer and the λ/4 plate, and the back side polarizing plate is Contains a positive C plate arranged between the second polarizer and the λ/2 plate.

[27] The set of polarizing plates as described in any one of [23] to [26], wherein the positive C plate of the visible side polarizing plate and the positive C plate of the back side polarizing plate are The retardation value in the thickness direction is slightly equal.

[28] The polarizing plate set as described in any one of [23] to [27], wherein the thickness direction of the positive C plate has a retardation value of -50 nm to -150 nm.

[29] An IPS mode liquid crystal display device, which is formed by arranging the set of polarizing plates described in any one of [22] to [28] on an IPS mode liquid crystal cell with an in-plane phase difference of 400 nm to 500 nm.

[30] The IPS mode liquid crystal display device described in [29], wherein the size of the IPS mode liquid crystal display device is less than 15 inches diagonally.

The polarizing plate set according to the present invention can provide a liquid crystal display device, which can suppress the reflection of external light, and can ensure good visibility even in an outdoor environment with strong external light.

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: Slow axis of λ/2 plate

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, 52: Polarizer

32’: The first polarizer

34: λ/4 plate

35, 55: positive C plate

36: Surface treatment layer

52’: 2nd polarizer

54: λ/2 plate

60: LCD unit

61: Brightness enhancement film

The schematic cross-sectional view of Fig. 1 shows an example of a preferred layer configuration in the polarizing plate set of the first embodiment and the second embodiment of the present invention.

The schematic cross-sectional view of Fig. 2 shows an example of a preferred layer configuration in the polarizing plate set of the third and fourth embodiments of the present invention.

Fig. 3 is a schematic diagram showing an example of a preferable shaft configuration in the IPS liquid crystal display device of the first embodiment of the present invention.

Fig. 4 is a schematic diagram showing an example of a preferable shaft configuration in the IPS liquid crystal display device of the second embodiment of the present invention.

Fig. 5 is a schematic diagram showing an example of a preferable shaft configuration in the IPS liquid crystal display device of the third embodiment of the present invention.

Fig. 6 is a schematic diagram showing an example of a preferable shaft configuration in the IPS liquid crystal display device of the fourth embodiment of the present invention.

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

The schematic cross-sectional views of (a) to (b) in Fig. 1 show examples of preferred layer configurations in the polarizing plates of Embodiment 1 and Embodiment 2 of the present invention. The polarizing plates of Embodiment 1 and Embodiment 2 of the present invention will be described with reference to Fig. 1 (a) to (b). The set of polarizing plates shown in Fig. 1 (a) to (b) includes: the visual recognition side polarizing plate 10, which is formed by the single area layer λ/4 plate 34 and the positive C plate 35 of the polarizing plate 30; and The back side polarizing plate 20 is formed by a single-area layer brightness enhancement film 61 of the polarizing plate 50.

The schematic cross-sectional views of Figure 2 (a) to (d) show the present invention Examples of preferred layer configurations in the polarizing plate of the third and fourth embodiments. The polarizing plate of the present invention will be described with reference to Fig. 2 (a) to (d). The polarizing plate set shown in Fig. 2 (a) to (d) contains: the visual recognition side polarizing plate 10, which is formed by the single-area layer λ/4 plate 34 and the positive C plate 35 of the polarizing plate 30; and The back side polarizing plate 20 is formed by layering the single-area layer λ/2 plate 54 and the positive C plate 55 of the polarizing plate 50, and layering the brightness enhancement film 61 on the other area of the polarizing plate 50.

[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 polarizers 32 (the first polarizer 32') and 52 (the second polarizer 52') are usually manufactured through the following steps: a step of uniaxially stretching a polyvinyl alcohol-based resin film; The step of dyeing with chromatic pigments by adsorbing dichroic pigments; the step of treating the polyvinyl alcohol resin film adsorbing dichroic pigments with an aqueous solution of boric acid; and the step of washing after 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 of vinyl acetate and other monomers copolymerizable therewith. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having ammonium groups.

The degree of saponification of the polyvinyl alcohol resin is generally about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formaldehyde and polyvinyl acetal modified with aldehydes may 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.

Such a polyvinyl alcohol-based resin formed into a film can be used as a raw material film for the polarizers 32 (first polarizer 32') and 52 (second polarizer 52'). The method of forming a polyvinyl alcohol-based resin into a film is not particularly limited, and the film can be formed by a known method. The thickness of the polyvinyl alcohol-based raw material film is not particularly limited, but is, for example, about 10 μm to 150 μm.

The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before the dichroic dye is dyed, at the same time as the dyeing, or after the dyeing. When uniaxial stretching is performed after dyeing, the uniaxial stretching can be performed before or during the boric acid treatment. Moreover, uniaxial extension can be performed in these plural time periods.

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

The method of dyeing the polyvinyl alcohol-based resin film with a dichroic dye, for example, a method of immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye can be adopted. Specifically, dichroic dyes can be iodine and dichroic dyes. In addition, the polyvinyl alcohol-based resin film is preferably subjected to water immersion treatment before the dyeing treatment.

When iodine is used as a dichroic dye, a method of immersing a polyvinyl alcohol resin film in an aqueous solution containing iodine and potassium iodide for dyeing is usually adopted. The content of iodine in this aqueous solution is usually about 0.01 to 1 part by weight with respect to 100 parts by weight of water. In addition, the content of potassium iodide is usually about 0.5 to 20 parts by weight with respect to 100 parts by weight of water. The temperature of the aqueous solution used for 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 immersing a polyvinyl alcohol resin film in an aqueous solution containing a water-soluble dichroic dye for dyeing is usually adopted. The content of the dichroic dye in the aqueous solution is usually about 1×10 ^-4 to 10 parts by weight, preferably about 1×10 ^-3 to 1 part by weight, relative to 100 parts by weight of water. The aqueous solution may contain inorganic salts such as sodium sulfate as a dyeing auxiliary. The temperature of the dichroic dye aqueous solution used for 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 is usually performed by immersing the dyed polyvinyl alcohol resin film in an aqueous solution containing boric acid.

In the aqueous solution containing boric acid, the amount of boric acid is usually about 2 to 15 parts by weight relative to 100 parts by weight of water, preferably 5 to 12 parts by weight. When iodine is used as a dichroic dye, the aqueous solution containing boric acid preferably contains potassium iodide. In the aqueous solution containing boric acid, the amount of potassium iodide is usually about 0.1 to 15 parts by weight relative to 100 parts by weight of water, preferably 5 to About 12 parts by weight. The immersion time in the aqueous solution containing boric acid 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 aqueous solution containing boric acid is usually 50°C or higher, preferably 50 to 85°C, more preferably 60 to 80°C.

The polyvinyl alcohol resin film after boric acid treatment is usually washed with water. The water washing treatment can be performed, for example, by immersing a boric acid-treated polyvinyl alcohol-based resin film in water. The water temperature in the water washing treatment 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 to obtain polarizers 32 (first polarizer 32') and 52 (second polarizer 52'). The drying treatment can be performed using a hot air dryer or a far infrared heater. The drying treatment temperature 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.

The drying treatment reduces the moisture content of the polarizers 32 (first polarizer 32') and 52 (second polarizer 52') to a practical level. The moisture content is usually 5 to 20% by weight, preferably 8 to 15% by weight. If the moisture content is less than 5% by weight, the polarizers 32 (first polarizer 32') and 52 (second polarizer 52') lose their flexibility, and the polarizer 32 (first polarizer 32') and 52 (the second polarizer 52') is damaged and cracked after drying. In addition, if the moisture content is higher than 20% by weight, the thermal stability of the polarizers 32 (first polarizer 32') and 52 (second polarizer 52') will be poor.

By the above method, a polarizer with a dichroic dye adsorbed on a polyvinyl alcohol resin film can be manufactured.

In addition, in the manufacturing process of the polarizer, the polyvinyl alcohol-based tree The extension, dyeing, boric acid treatment, water washing step, and drying step of the lipid film can be performed, for example, according to the method described in JP 2012-159778. The method described in this document can be used to form a polyvinyl alcohol-based resin layer that becomes 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, more preferably 12 μm or less. Considering that good optical properties can be imparted, the thickness of the polarizer is usually 3 μm or more.

The use of a polarizer that suppresses shrinkage in a high-temperature environment can suppress the phase difference change caused by the distortion of the λ/2 plate and λ/4 plate that accompany the shrinkage of the polarizer, which can cause uneven display when used in liquid crystal display devices. Smaller polarizer.

When the polarizer is kept at 80°C for 240 minutes, the shrinkage force per 2 mm width in the absorption axis direction is preferably 2 N/2 mm or less. If the shrinkage force is greater than 2N/2mm, the dimensional change under high temperature environment will increase, and the shrinkage force of the polarizer will increase. The λ/2 plate and λ/4 plate will be easily distorted, and the polarizer will tend to crack. If the stretching ratio is lowered or the thickness of the polarizer is made thinner, the shrinkage force of the polarizer tends to be 2N/2mm or less. The method of measuring the contraction force is based on the method of the following Examples.

It is preferable to layer a protective film on at least one area of the polarizer, and it may also have protective films on both sides. The protective films 31a, 31b, 51a, and 51b may be composed of transparent resin films. Especially preferably, it is made of materials with excellent transparency, mechanical strength, thermal stability, and moisture shielding properties. In this specification, a transparent resin film refers to a resin film with a monomer transmittance of 80% or more in the visible light range.

By making the positive C plates 35, 55, the λ/4 plate 34, and the λ/2 plate 54 function as protective films and omitting the protective films 31b and 51b, it is also an effective means for thinning the polarizer. Also, making the brightness enhancement film 61 function as a protective film and omitting the protective film 51a is also an effective means for thinning the polarizer.

The protective films 31a, 31b, 51a, and 51b can be formed from materials that have been widely used as protective film forming materials in this field. The materials are cellulose resins, chain polyolefin resins, and cyclic polyolefin resins. Resin, acrylic resin, polyimide resin, polycarbonate resin, polyester resin, etc.

These resins can be blended with suitable additives to the extent that the transparency is not compromised.

Additives include, for example, antioxidants, ultraviolet absorbers, antistatic agents, slip agents, nucleating agents, anti-fogging agents, anti-caking agents, retardation reducing agents, stabilizers, processing aids, plasticizers, impact resistance Additives, matting agents, antibacterial agents, antifungal agents, etc. A plurality of these additives can be used in combination.

For the method of forming a film from the above resin, any most suitable method can be appropriately selected. For example, it can be used: a solvent casting method in which a resin dissolved in a solvent is cast on a metal belt or roller, and the solvent is dried to remove the solvent to obtain a film; the resin is heated to above its melting temperature, kneaded, extruded from a die, and cooled, thereby Melt extrusion method to obtain film, etc. The melt extrusion method can extrude a single-layer film or a multi-layer film at the same time.

In addition, a phase difference plate can be used in the protective film 31a. The phase difference plate is designed to improve the visibility when viewing the screen through polarized sunglasses. The aforementioned film is stretched. As a phase difference plate, it is better to arrange the angle between the slow axis of the λ/4 plate and the absorption axis of the polarizing film to be slightly 45° from the viewpoint of improving visibility. In addition, when laminating with the elongated polarizing film, it is preferable to extend the polarizing plate in a roll-to-roll method if the angle with the longitudinal direction of the elongated shape is slightly 45° or 135°.

[Surface treatment layer 36 of protective film 31a]

The protective film 31a may have a surface treatment layer 36 on the side opposite to the surface where the polarizer 32 (first polarizer 32') is bonded. The surface treatment layer 36 may be, for example, a hard coat layer having fine surface irregularities. The hard coat layer is preferably harder than H in pencil hardness.

If the pencil hardness is H or lower, the surface is likely to be scratched, and if it is scratched, the visibility of the liquid crystal display device deteriorates. The pencil hardness is calculated in accordance with JIS K 5600-5-4: 1999 "General Test Methods for Coatings, Chapter 5: Mechanical Properties of Coating Films, Section 4: Scratch Hardness (Pencil Method)". It means using pencils of various hardnesses. The hardness of the hardest pencil without scars when scratched.

The protective film 31a having the surface treatment layer 36 has a haze value in the range of 0.1 to 45%, more preferably in the range of 5 to 40%. If the haze value is greater than 45%, although the external light can be reduced, the tube bundle of the black display screen will be reduced. In addition, if the haze value is less than 0.1%, it is not preferable because external light enters the screen due to insufficient anti-glare performance. Here, the haze value is obtained according to JIS K 7136: 2000 "Plastic-transparent material haze determination method".

Hard coat with fine surface unevenness can be as follows Method of formation: a method of forming a coating film containing organic or inorganic microparticles on the surface of a resin film; and a method of forming a coating film containing or not containing organic microparticles or inorganic microparticles, and then forming a concave-convex shape roll imprinting method, for example, It is formed by embossing. Such a coating film can be formed, for example, by a method of applying a coating solution (curable resin composition) containing a binder component formed of a curable resin and organic or inorganic particles on the surface of the resin film.

For the protective film 31a, in addition to the aforementioned anti-glare treatment (haze imparting treatment) that also has a hard coat function, various additional surface treatments such as anti-reflection layer, anti-static treatment, anti-fouling treatment, or antibacterial treatment can be applied. It is also possible to form a coating layer composed of a liquid crystal compound or its high molecular weight compound. In particular, when forming an anti-reflection layer with a reflectance of 3% or less, the visibility is not impaired even if it is more than 10000 Lux, which is preferable. Moreover, in addition to surface treatment, an antistatic function can also be provided to other parts of the polarizing plate through, for example, an adhesive layer.

[Protective film 31b, 51b]

The protective films 31b and 51b are preferably cellulose-based resins or cyclic polyolefin-based resins in consideration of easy control of the retardation value and easy availability.

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 group of the cellulose are substituted with acetyl, propionyl and/or butyryl groups. Examples include those composed of cellulose acetate, propionate, butyrate, and mixed esters of these. Among them, cellulose triacetate, cellulose diacetate, cellulose acetate propionate, and butyl acetate are preferred. Acid cellulose, etc.

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

Cyclic polyolefin resins include, for example, cyclopentadiene and olefins or (meth)acrylic acid or its esters are prepared by Diels-Alder reaction to obtain norcampine or its derivatives as monomers. Ring shift polymerization, followed by hydrogenation to obtain the resin; Dicyclopentadiene and olefins or (meth)acrylic acid or its esters are obtained by Diels-Adel reaction of tetracyclododecene or its derivatives As monomers undergo ring-opening translocation polymerization, followed by hydrogenation to obtain resins; at least two monomers selected from norbornene, tetracyclododecene, these derivatives, and other cyclic olefin monomers The resin is obtained by the same ring-opening translocation copolymerization and then hydrogenation; for cyclic olefins such as norbornene, tetracyclododecene, or derivatives of these, it has a chain olefin and/or ethylene Resins obtained by addition copolymerization of aromatic compounds based on the base.

The method of forming a film from the above resin can be suitably selected as any most suitable method. For example, it can be used: a solvent casting method in which a resin dissolved in a solvent is cast on a metal belt or roller and then dried to remove the solvent to obtain a film; the resin is heated to a temperature higher than its melting temperature, kneaded, extruded from a die, cooled, and The melt extrusion method to obtain the film, etc. The melt extrusion method can extrude a single-layer film or simultaneously extrude a multi-layer film.

In order to suppress the decrease in the degree of polarization caused by depolarization, the protective films 31b and 51b preferably have a thickness direction retardation value Rth of 10 nm or less under. The retardation value Rth in the thickness direction is a value obtained by multiplying the value of the average in-plane refractive index minus the refractive index in the thickness direction 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 of the film in the x-axis direction (in-plane slow axis direction), n _y is the in-plane y-axis direction (in-plane fast axis direction, the direction perpendicular to the x-axis in the plane) refractive index, _n-z of the z-axis direction perpendicular to the film plane (thickness direction) of the refractive index, and, d is the film thickness.

Here, the retardation value can be a value of any wavelength in the range of about 500 to 650 nm near the center of the visible light. In this specification, the retardation value at a wavelength of 590 nm is used 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.

The method of controlling the retardation value Rth of the resin film in the plane and the thickness direction within the range of 10nm or less can include a method of reducing the residual in-plane and thickness direction distortion as much as possible when the film is made. For example, in the above-mentioned solvent casting method, a heat treatment can be used to alleviate the residual shrinkage distortion in the plane and the thickness direction generated when the casting resin solution is dried. On the other hand, in the above-mentioned melt extrusion method, in order to prevent the resin film from being extended from the mold to the cooling, the distance from the mold to the cooling drum is minimized, and the extrusion amount and the rotation speed of the cooling drum are controlled. , So that the film will not Extended control methods, etc. Also, as with the solvent casting method, a method of reducing the distortion remaining in the obtained film by heat treatment can also be adopted.

[λ/4 plate 34]

The λ/4 plate 34 is particularly preferably composed of materials with excellent transparency, mechanical strength, thermal stability, and moisture shielding properties. Examples include polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.), cyclic polyolefin resins (norbornene resins, etc.); cellulose triacetate, cellulose diacetate, etc. Cellulose resins such as cellulose ester resins; polyester resins; polycarbonate resins; (meth)acrylic resins; polystyrene resins; liquid crystal compositions; or mixtures and copolymers of these . Among them, a film composed of a polycarbonate resin and a liquid crystal composition has positive wavelength dispersibility and is therefore preferable.

Here, the positive wavelength dispersion means that the following formula (c) is satisfied. The numbers in parentheses refer to the measured wavelength (unit: nm) of the retardation value.

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

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

Nz=Re/Rth+0.5 (d)

In the range of non-destructive transparency, suitable additives can be added to the λ/4 plate. Additives include, for example, antioxidants, ultraviolet absorbers, antistatic agents, slip agents, nucleating agents, anti-fogging agents, anti-blocking agents, and retardation reducing agents. Low agents, stabilizers, processing aids, plasticizers, impact resistant additives, matting agents, antibacterial agents, antifungal agents, etc A plurality of these additives can be used in combination.

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

The divalent phenol is preferably composed of 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-hydroxybenzene) Yl)-4-methylpentane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, and α,α'-bis(4-hydroxyphenyl) -Homopolymer or copolymer made from at least one divalent phenol selected from the group of m-dicumylbenzene, particularly preferably the homopolymer of bisphenol A and 1,1-bis(4-hydroxyl Phenyl)-3,3,5-trimethylcyclohexane and divalent phenol copolymer, the divalent phenol is composed of bisphenol A, 2,2-bis{(4-hydroxy-3-methyl) At least one selected from phenyl}propane and α,α'-bis(4-hydroxyphenyl)-dicumyl.

The carbonate precursor system uses a carbonyl halide, a carbonate, a haloformate, etc., and specific examples include phosgene, diphenyl carbonate, or dihaloformate of divalent phenol.

The method of forming a film from the resin as described above can be appropriately selected any most suitable method. For example, it can be used: a solvent casting method in which a resin dissolved in a solvent is cast on a metal belt or roller and then dried to remove the solvent to obtain a film; the resin is heated to a temperature above its melting temperature, extruded from a die after kneading, and cooled However, the melt-extrusion method and the like are obtained by this. The melt extrusion method can extrude a single-layer film or simultaneously extrude a multi-layer film.

In order to give a predetermined retardation value to the film produced in this way, it is preferable to perform a stretching treatment. Stretching can use any of the most suitable stretching methods such as uniaxial stretching/sequential biaxial stretching/simultaneous biaxial stretching.

The liquid crystal composition preferably has a nematic liquid crystal phase (nematic liquid crystal). The liquid crystal display mechanism of the liquid crystal material can be lyotropic or thermotropic. The alignment state of the liquid crystal material is preferably a homogeneous alignment. As the liquid crystal material, for example, a liquid crystal polymer or a liquid crystal monomer can be used. The liquid crystal polymer and the liquid crystal monomer can be used alone or in combination.

In the present invention, when used as a λ/4 plate, it is preferably a cured layer of a liquid crystal composition. Specifically, when the liquid crystal composition contains a liquid crystalline monomer, the liquid crystalline monomer 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, if the liquid crystal monomers are polymerized or crosslinked with each other, the aforementioned alignment state can be fixed. Here, although a polymer is formed by polymerization and a three-dimensional network structure is formed by crosslinking, these are non-liquid crystal properties. Therefore, the formed retardation layer will not be transformed into a liquid crystal phase, a glass phase, or a crystalline phase due to, for example, a temperature change peculiar to liquid crystal compounds. As a result, the retardation layer is not affected by temperature changes and can be a layer with extremely excellent stability.

The above-mentioned liquid crystal monomers can be exemplified by BASF's trade name LC242, Merck's trade name E7, and Wacker-Chem's trade name LC-Sillicon-CC3767. These liquid crystal monomers can be used alone or Use 2 or more types in combination.

The temperature range in which the above-mentioned liquid crystalline monomer exhibits liquid crystallinity varies according to its type. 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 hardening layer can be set to have the most suitable function as a λ/4 plate. In other words, the thickness can be set to obtain the desired optical characteristics. 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.

Any appropriate method can be used to produce a film exhibiting optical anisotropy by coating and aligning the liquid crystal composition. For example, an alignment treatment is performed on the surface of a base film such as a polyethylene terephthalate film, and a coating liquid containing the above-mentioned liquid crystal composition is applied to the surface to form a liquid crystal cured layer. The coating liquid may contain a polymerization initiator, a crosslinking agent, a surfactant, a solvent, and the like. Any suitable aligning treatment can be used for the alignment treatment. Specifically, mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment can be cited.

Specific examples of mechanical alignment treatment include rubbing treatment and extension treatment. Specific examples of the physical alignment treatment include magnetic field alignment treatment and electric field alignment treatment. Specific examples of chemical alignment treatment include oblique vapor deposition and optical alignment treatment. It is preferably a rubbing treatment. The alignment treatment can be directly applied to the surface of the substrate film, or any suitable alignment film (typically a silane coupling agent layer, a polyvinyl alcohol layer or a polyimide layer) can be formed on the substrate film and applied to the alignment membrane. It is preferable to apply the rubbing treatment directly to the surface of the base film.

The alignment direction of the above alignment treatment can be adapted to the above requirements Set the angle. By performing the alignment treatment, the liquid crystal material can be aligned according to the alignment direction of the base film, so 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 polarizer 32 (the first polarizer 32') (long strip) has an absorption axis in its longitudinal direction, the alignment treatment can be performed in a direction with an angle of 135° relative to the longitudinal direction of the substrate (long strip). . By forming the liquid crystal hardened layer in this way, the polarizer 32 (first polarizer 32') (polarizer) and the λ/4 plate 34 can be continuously laminated on a roll-to-roller basis. As a result, the manufacturing steps can be greatly shortened.

[λ/2 plate 54]

The λ/2 plate 54 used in the polarizing plate set of Embodiment 3 and Embodiment 4 of the present invention can be a retardation film made of the same material as the λ/4 plate 34. λ/2 plate and λ/4 plate can use retardation films made of the same material, or retardation films made of different materials.

Considering the positive wavelength dispersion, thinning, and ease of adjusting the retardation value, it is preferable to use a polycarbonate resin film like the λ/4 plate, or to exhibit optical anisotropy by coating or aligning a liquid crystal compound的膜。 The film.

In addition, in the present invention, the retardation value of the λ/2 plate means that the retardation value Re in the measurement wavelength of 590 nm is 200 nm to 300 nm. Furthermore, the Nz coefficient of the λ/2 plate is preferably in the range of 0.8 to 1.2. More preferably, it is in the range of 0.95 to 1.05.

When using a film that exhibits optical anisotropy by coating and aligning liquid crystal compounds as a λ/2 plate, the thickness of the retardation layer is preferably 0.5 to 20 μm, more preferably 0.5 to 16 μm, particularly preferably 0.5 to 8 μm.

As a film that exhibits optical anisotropy by coating and aligning liquid crystal compounds, for example, when the second polarizer 52' (long strip) has an absorption axis in its longitudinal direction, it is positioned relative to the substrate (long strip). The long direction angle is slightly 135° to perform alignment treatment. By forming the liquid crystal hardened layer in this way, the second polarizer 52' (polarizing plate) and the λ/2 plate 54 can be laminated continuously in a roll-to-roll manner. As a result, the manufacturing steps can be greatly shortened.

[Positive C plate 35, 55]

Used in the present invention refers to the positive C plate is substantially equal to n _x and n _y of a positive uniaxial retardation film having an optical axis and the normal direction of the film. If expressed in terms of refractive index, it is a retardation film with a relationship of n _x ≒ n _y <n _z .

The positive C plates 35 and 55 preferably have an in-plane retardation Re of 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. It is more preferably -70nm to -120nm.

As long as the positive C plates 35 and 55 have the aforementioned optical properties, their materials and forms are not particularly limited. For example, any of the following can be used: a retardation film composed of a birefringent polymer film; and a phase with a retardation layer formed by coating or transferring a low-molecular or polymer liquid crystal compound on a transparent support Poor film and so on. In addition, they can also be used in separate layers.

A retardation film composed of a birefringent polymer film having the above-mentioned optical properties can be easily formed by the following method: heat-shrinkable film is laminated and heated while applying a desired tension to extend the polymer film in the thickness direction of the film Method; and coating vinyl carbazole polymer and drying method. In addition, the retardation layer formed of a liquid crystal compound having the above-mentioned optical properties includes, for example, a cholesteric discotic liquid crystal compound or composition containing palm-like structural units so that the spiral axis is aligned slightly perpendicular to the substrate A layer formed by post-fixation; a layer formed by post-fixing the rod-shaped liquid crystal compound or composition with a positive refractive index anisotropy aligned slightly perpendicular to the substrate. The rod-shaped liquid crystal compound may be a low molecular compound or a high molecular compound. In addition, not only a single retardation layer, but a plurality of retardation layers can be laminated to form a retardation layer exhibiting the above-mentioned optical characteristics. In addition, the retardation layer can be constructed such that the entire laminate of the support and the retardation layer satisfies the above-mentioned optical characteristics. The rod-shaped liquid crystal compound used is more suitable for those in a nematic liquid crystal phase, a matrix liquid crystal phase, and a lyotropic liquid crystal phase in the fixed alignment temperature range. Preferably, it is possible to obtain a liquid crystal of A phase and B phase of display matrix with uniform vertical alignment without shaking. The birefringence of these phases is greater than that of the nematic liquid crystal phase, and the film thickness can be made thinner, which is preferable in consideration of this point. In addition, with regard to the rod-shaped liquid crystal compound that becomes the above-mentioned liquid crystal state in the tangential alignment temperature range in the presence of an additive, it is preferable to form a layer using a composition containing the additive and the rod-shaped liquid crystal compound.

The rod-shaped liquid crystalline compound preferably uses azomethines, azo oxides, cyanobiphenyls, cyanophenyl esters, benzoic acid esters, phenyl cyclohexanecarboxylic acid esters, and cyanobenzene. Cyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted phenylpyrimidines, phenyldioxanes, diphenylacetylenes, and alkenylcyclohexyl benzonitriles. In addition to the above low-molecular liquid crystal molecules, high-molecular liquid crystal molecules can also be used. It is preferable to use liquid crystal molecules that can be produced by active light, electron rays, heat, etc. Part of the structure of polymerization and crosslinking reactions. The number of partial structures is 1 to 6, preferably 1 to 3.

When it contains a retardation layer formed by fixing a rod-shaped liquid crystalline compound in an aligned state, it is preferable to use a retardation layer formed by aligning the rod-shaped liquid crystalline compound substantially vertically and fixing it in this state. Substantially vertical means that the angle between the film surface and the director of the rod-shaped liquid crystal compound is in the range of 70° to 90°. The liquid crystal compounds can be oriented obliquely, or they can gradually change the tilt angle (mixed alignment). Regardless of the diagonal alignment or the mixed alignment, the average inclination angle is preferably 70° to 90°, more preferably 80° to 90°, and most preferably 85° to 90°.

The retardation layer formed by the rod-shaped liquid crystalline compound can be formed by the following method: the coating liquid contains the rod-shaped liquid crystalline compound, the following polymerizable initiator, air interface vertical alignment agent, and other additives as required, The coating liquid is coated on the vertical alignment film formed on the support to align it vertically and fix the alignment state. When it is formed on a temporary support, it can be produced by transferring the retardation layer on the support. Moreover, in addition to one retardation layer, a plurality of retardation layers may be laminated to form a retardation layer exhibiting the above-mentioned optical characteristics. In addition, the retardation layer can be constructed such that the entire laminate of the support and the retardation layer satisfies the above-mentioned optical characteristics.

In the present invention, a positive C plate layer formed of a liquid crystal compound can be formed by overlapping the λ/4 plate 34 or the λ/2 plate 54.

The two positive C plates 35 and 55 used in the present invention preferably have a slightly equal phase difference in the thickness direction. In the present invention, "slightly equal" means that the difference in retardation value in the thickness direction is 20 nm or less.

[Brightness enhancement film 61]

The brightness enhancement film 61 is also called a reflective polarizer and uses a polarization conversion element that has the function of separating light emitted from a light source (backlight) into transmitted polarized light, reflected polarized light, and scattered polarized light. As described above, the brightness enhancement film 61 is disposed on the polarizing plate 50, thereby utilizing the retro-reflected polarized light or scattered polarized light to improve the efficiency of linearly polarized light emitted from the polarizing plate 50.

The brightness improvement film 61 may be an anisotropic reflective polarizer, for example. An example of an anisotropic reflective polarizer is an anisotropic multiple film that passes linearly polarized light in one vibration direction and reflects linearly polarized light in the other vibration direction. A specific example is DBEF manufactured by 3M (Japanese Patent Application Publication No. 4-268505) No. Bulletin, etc.). Another example of the anisotropic reflective polarizer 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 (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 grid reflective polarizer that can emit reflected polarized light even in the visible light field by implementing fine processing on metal (US Patent No. 6288840, etc.) ), a film formed by adding fine metal particles to a polymer matrix (Japanese Patent Laid-Open No. 8-184701).

Optical layers 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 on the surface of the brightness enhancement film 61 opposite to the polarizing plate 50. By forming the optical layer, the adhesion to the backlight tape 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, but it is thinned by a polarizing plate From the viewpoint of consideration, it is preferably 10 to 50 μm, more preferably 10 to 30 μm.

[Next to each layer]

It is preferable to provide an arbitrary suitable adhesive layer or adhesive layer between each member constituting the polarizing plate of the present invention. For example, in order to bond a polarizing plate to a liquid crystal cell, it is preferable to provide an adhesive layer on the surface of the polarizing plate. In the first and second embodiments, for example, an adhesive layer may be provided on the outside of the λ/4 plate 34, and an adhesive layer may be provided on the outside of the protective film 51b. Furthermore, in the third and fourth embodiments, for example, an adhesive layer may be provided on the outside of the λ/4 plate 34 and an adhesive layer may be provided on the outside of the λ/2 plate 54.

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 rays. Examples of the active energy ray-curable adhesive include a composition containing a radical polymerizable compound such as an acrylic compound and a composition containing a cationic polymerizable compound such as an epoxy-based compound. These compositions preferably contain a radical polymerization initiator or a cationic polymerization initiator, respectively. The adhesive is preferably an adhesive containing acrylic resin (acrylic adhesive).

[LCD 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 one side of the substrate (color filter substrate). On the other side of the substrate (active matrix substrate) is provided with switching elements (representatives are TFT), scanning lines for applying gate signals to the switching element, signal lines for applying source signals, and pixel electrodes.

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

The driving mode of the above-mentioned liquid crystal cell used to configure the polarizing plate set of Embodiment 1 and Embodiment 3 of the present invention is an IPS (In-Plane Switching) mode with an in-plane phase difference of 100 to 200 nm in a wavelength of 590 nm. In this way, the liquid crystal cell itself has an in-plane retardation value close to the wavelength of λ/4, so that the circular polarizing plate can be configured as the viewing side polarizing plate, and the reflection of external light can be greatly reduced.

The method of making the in-plane phase difference of the liquid crystal cell from 100 nm to 200 nm at a wavelength of 590 nm can be produced 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 with a desired in-plane phase difference value can be produced.

The driving mode of the above-mentioned liquid crystal cell used to configure the polarizing plate set of Embodiment 2 and Embodiment 4 of the present invention adopts an IPS (In-Plane Switching) mode with a wavelength of 590 nm and an in-plane phase difference of 400 to 500 nm. In this way, the liquid crystal cell itself has an in-plane retardation value close to 3 λ/4 wavelength, so that the circular polarizing plate can be configured as the viewing side polarizing plate, and the reflection of external light can be greatly reduced.

The method of making the in-plane phase difference of the liquid crystal cell from 400nm to 500nm at a wavelength of 590nm can be achieved by adjusting the liquid crystal cell The thickness of the crystal is produced. 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 with a desired in-plane phase difference value can be produced.

[Liquid crystal display device]

The liquid crystal display device of the present invention is provided with the polarizing plate set of the present invention and the above-mentioned liquid crystal cell. The liquid crystal display device of the present invention is particularly excellent in outdoor visibility with strong external light, so it is suitable 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 less than 15 inches diagonally.

The shaft configuration of each member in the liquid crystal display device according to Embodiment 1 of the present invention will be described with reference to FIG. 3.

For ease of description, in the present invention, the initial alignment direction of the liquid crystal cell used is defined as 0°, and the counterclockwise angle when viewing the back side polarizer from the viewing side polarizer is defined as positive. The slow axis of the λ/4 plate 34 is arranged slightly at -90° with respect to the aforementioned initial alignment direction. In addition, the absorption axis of the visible side polarizer is arranged at a slight angle of -45° with respect to the initial alignment direction, and the absorption axis of the back side polarizer is arranged at approximately 45° with respect to the initial alignment direction. Here, when it is written as a few degrees, it means that it is within the range of ±5°, preferably within the range of ±2°.

Next, the shaft configuration of each member in the liquid crystal display device according to Embodiment 2 of the present invention will be described with reference to FIG. 4.

The slow axis of the λ/4 plate 34 is arranged slightly at 0° with respect to the initial alignment direction of the liquid crystal cell. In addition, the absorption axis of the polarizing plate on the visible side is arranged at 45° with respect to the initial alignment direction, and the absorption of the polarizing plate on the back side The shaft system is arranged slightly at 135° with respect to the aforementioned initial alignment direction. Here, when it is written as a few degrees, it means that it is within the range of ±5°, preferably within the range of ±2°.

Next, the shaft configuration of each member in the liquid crystal display device of Embodiment 3 of the present invention will be described with reference to FIG. 5.

The slow axis of the λ/4 plate 34 is arranged slightly at -90° relative to the initial alignment direction of the liquid crystal cell, and the slow axis of the λ/2 plate 54 is arranged at slightly 0° relative to the aforementioned initial alignment direction. In addition, the absorption axis of the viewing side polarizer is arranged at a slight angle of -45° with respect to the initial alignment direction, and the absorption axis of the back side polarizer is arranged at a slight angle of -45° to the initial alignment direction. Here, when it is written as a few degrees, it means that it is within the range of ±5°, preferably within the range of ±2°.

Next, the shaft structure of each member in the liquid crystal display device according to the fourth embodiment of the present invention will be explained with reference to FIG. 6.

The slow axis of the λ/4 plate 34 is arranged slightly at 0° with respect to the initial alignment direction of the liquid crystal cell, and the slow axis of the λ/2 plate 54 is arranged at slightly 90° with respect to the aforementioned initial alignment direction. In addition, the absorption axis of the viewing-side polarizer is arranged at 45° relative to the initial alignment direction, and the absorption axis of the back-side polarizing plate is arranged at 45° relative to the initial alignment direction. Here, when it is written as a few degrees, it means that it is within the range of ±5°, preferably within the range of ±2°.

In addition, in 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 is preferably the angle relative to the long side of the liquid crystal cell Slightly 45°.

(Example)

The following examples illustrate the present invention in more detail, but the present invention is not limited to these examples. In the example, unless otherwise specified, the content or usage amount and% are based on weight. Also, the angle is positive counterclockwise. In addition, the following methods were used to measure the physical properties in the following examples.

(1) Measurement of thickness:

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

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

Using the phase difference meter "KOBRA (registered trademark)-WPR" manufactured by Oji Measurement Instruments Co., Ltd. and based on the principle of the parallel Nicol rotation method, the in-plane retardation and thickness direction retardation at each wavelength were measured at a temperature of 23°C.

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

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

(4) Measurement of shrinkage force of polarizer

The polarizer was cut into a width of 2 mm and a length of 50 mm by using SUPER CUTTER (manufactured by Ogino Seiki Co., Ltd.) to measure the shrinking force direction (the direction of the absorption axis of the polarizer) as the long side. Use the obtained signature sheet as Test piece. A thermomechanical analyzer (manufactured by SII Nanotechnology Co., Ltd., type TMA/6100) was used to measure the shrinkage force of the test piece. This measurement is carried out in the fixed size mode, and the distance between the clamps is 10 mm. After placing the test piece in a room at 23°C and 55% for more than 24 hours, the temperature in the sample room is set as follows: the temperature in the sample room is increased from 23°C to 80°C in 1 minute, and then the temperature in the sample room is maintained at 80°C. After the temperature was raised and left for 4 hours, the shrinkage force in the longitudinal direction of the test piece was measured in an environment of 80°C.

In this measurement, the dead load is 0 mN, and the jig is made of SUS probe.

[Manufacturing example 1] Making of polarizer

A polyvinyl alcohol film with a thickness of 30 μm (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 immersed in pure water at 40°C for 40 seconds while maintaining tension Dyeing is performed by immersing 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. Thereafter, 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. After washing with pure water at 8°C for 15 seconds, dry at 60°C for 50 seconds under a tension of 300N, and then at 75°C for 20 seconds. The absorption of iodine on the polyvinyl alcohol film with a thickness of 12μm is obtained. Type polarizer. The shrinkage force of the polarizer obtained was measured to be 2.0N/2mm.

[Production example 2] Production of water-based adhesive

Dissolve 3 parts by weight of carboxyl modified polyvinyl alcohol [trade name "KL-318" obtained by Kuraray Co., Ltd.] in 100 parts by weight of water, and dissolve in the water Liquid addition of water-soluble epoxy resin polyamide epoxy-based additives [trade name "Sumirez Resin (registered trademark) 650(30)" obtained by Taoka Chemical Industry Co., Ltd., solid content concentration 30% by weight aqueous solution] 1.5 Parts by weight, prepared into a water-based adhesive.

[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: A cellulose triacetate film with hard coat made by KONICA MINOLTA Co., Ltd.; 25KCHCN-TC (thickness 32μm).

Protective film B: cellulose triacetate film manufactured by KONICA MINOLTA Co., Ltd.; KC2UA (thickness 25 μm).

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

Protective film D: Anti-reflective film made of cellulose triacetate resin manufactured by TOPPAN TOMOEGAWA OPTICAL PRODUCTS Co., Ltd.; 40KSPLR (thickness 44μm, Y value according to JIS-Z8701-1982 1.1%)

[Brightness enhancement film A]

Prepare the following brightness enhancement film.

Brightness-enhancing film A: Brightness-enhancing film with a thickness of 26μm (trade name "Advanced Polarized Film, Version 3" manufactured by 3M).

[Making of λ/4 plate 1]

After forming a polyvinyl alcohol film (thickness 0.1μm) on the surface of the base film (cellulose triacetate film, thickness 80μm), use a rubbing cloth to apply the surface of the polyvinyl alcohol film in a direction of -45° with respect to the longitudinal direction of the substrate. Rubbing treatment to make a base film with alignment film.

Next, 10 g of a polymerizable liquid crystal (manufactured by BASF Corporation, trade name Paliocolor LC242) showing a nematic liquid crystal phase, and a photopolymerization initiator for the polymerizable liquid crystal compound (manufactured by Ciba Specialty Chemicals, trade name IRGACURE (registered trademark) 907. 0.5 g containing benzotriazole-based ultraviolet absorber 1%) was dissolved in 40 g of toluene to prepare a coating liquid. Next, after applying the coating liquid on the surface of the alignment substrate obtained above with a bar coater, it was heated and dried at 90° C. for 2 minutes to thereby align the liquid crystal. The liquid crystal layer thus formed was irradiated with light of 20 mJ/cm ² using a metal halide lamp to harden the liquid crystal layer, thereby forming 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.

[Making of λ/4 plate 2]

A resin film ["ZEONOR FILM (registered trademark)" manufactured by ZEON Co., Ltd., Japan] obtained by hydrogenating a ring-opening polymer of a norbornene-based monomer is stretched longitudinally uniaxially. The thickness of the obtained retardation film was 18 μm, and the in-plane retardation value was 137.2 nm at a wavelength of 590 nm.

[Making 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), using a rubbing cloth, apply the surface of the polyvinyl alcohol film in a direction of -45° with respect to the longitudinal direction of the substrate. Rubbing treatment to make a base film with alignment film.

Next, 10 g of a polymerizable liquid crystal (manufactured by BASF Corporation, trade name Paliocolor LC242) showing a nematic liquid crystal phase, and a photopolymerization initiator for the polymerizable liquid crystal compound (manufactured by Ciba Specialty Chemicals, trade name IRGACURE (registered trademark) 907. 0.5 g containing benzotriazole-based ultraviolet absorber 1%) was dissolved in 40 g of toluene to prepare a coating liquid. Next, after applying the coating liquid on the surface of the alignment substrate obtained above with a bar coater, it was heated and dried at 90° C. for 2 minutes to thereby align the liquid crystal. The liquid crystal layer thus formed was irradiated with light of 20 mJ/cm ² using a metal halide lamp to harden the liquid crystal layer, thereby forming 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.

[Making of λ/2 plate 2]

A resin film obtained by hydrogenating a ring-opening polymer of a norbornene-based monomer [ZEONOR film (registered trader Mark)”] was stretched longitudinally uniaxially. The thickness of the obtained retardation film was 39 μm, and the in-plane retardation value was 265.4 nm at a wavelength of 590 nm.

[Production of positive C board 1]

On the surface of the substrate film (cellulose triacetate film, thickness 80μm), a commercially available vertical alignment film (JALS-204R, manufactured by Japan Synthetic Rubber Co., Ltd.) was diluted 1:1 with methyl ethyl ketone, and then a wire rod coater Coating (coating amount 2.4 ml/m ² ). Immediately dry 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 photopolymerization initiator (IRGACURE (registered trademark) 907, manufactured by Ciba-Geigy Co., Ltd.), sensitizer (KAYACURE (registered trademark) DETX, Nippon Kayaku Co., Ltd. (Company) 0.02g, and the following air interface side vertical alignment agent 0.002g dissolved in 9.2g methyl ethyl ketone solution. On the alignment film side of the film forming the alignment film, the solution was coated with a wire bar and heated at 100°C for 2 minutes to align the rod-shaped liquid crystal compound. Then, the rod-shaped liquid crystal compound was cross-linked by irradiating the rod-shaped liquid crystal compound with a high-pressure mercury lamp of 120 W/cm ² at 80° C., and then cooled to room temperature to form a retardation layer with positive C plate characteristics. The thickness of the obtained retardation layer was 0.6 μm, and the retardation value in the thickness direction at a wavelength of 590 nm was -109.4 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.

[Production of positive C board 2 to 3]

Make positive C plates 2 to 3 in the same way as positive C plate 1. The retardation value becomes the desired retardation value by adjusting the thickness.

The thickness direction retardation value of the positive C plate 2 is Rth(590)=-91.2nm.

The thickness direction retardation value of the positive C plate 3 is Rth(590)=-69.1nm.

[Production of Polarizing Plate A]

The protective film A is subjected to saponification treatment, and the protective film C is subjected to corona treatment to the bonding surface of the polarizer. The cellulose triacetate surface of the protective film A and the corona-treated surface of the protective film C become the bonding surface with the polarizer, and the protective film A and the polarizer and the protective film C are bonded with an aqueous adhesive to obtain a polarizer A.

[Production of Polarizing Plate B]

The protective film B is subjected to saponification treatment, and the bonding surface of the protective film C with the polarizer is corona treated. The protective film B and the polarizer and the protective film C are adhered to the protective film B and the polarizer and the protective film C with a water-based adhesive so that the corona-treated surface of the protective film B and the protective film C becomes the bonding surface with the polarizer, thereby obtaining the polarizer B. Adhesive B is attached to 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 adhesion on the polarizer The brightness-enhancing film A was bonded to the surface of the agent B to obtain a polarizing plate B.

[Production of analog LCD unit]

The production of the analog liquid crystal cell A in Embodiment 1 or Embodiment 3 of the present invention will be described. Prepare 2 pieces of Alkali-free glass made by Corning: EAGLE XG (thickness 0.7mm, length 157mm×width 98mm size) bonded with adhesive B. At this time, corona treatment is performed on the bonding surface of the glass and the adhesive. Then stick the λ/4 plate 1 made previously on the adhesive B side of a piece of glass. At this time, the λ/4 plate 1 and the adhesive B surface were also corona treated. Finally, one side of the λ/4 plate of the glass bonded to the λ/4 plate 1 and the adhesive B side of another piece of glass are bonded to form a simulated liquid crystal cell A. At this time, corona treatment is performed on the bonding surface of the λ/4 plate 1 surface and the adhesive B. It is produced so that the slow axis direction of the λ/4 plate 1 becomes -45° when the longitudinal direction of the glass is 0°.

In Embodiment 1 or Embodiment 3 of the present invention, the initial alignment direction of the analog liquid crystal cell A is tentatively set at 45° to the longitudinal direction of the glass, and the analog liquid crystal cell A is assumed to be when the driving voltage is applied (in white display) Liquid crystal cell.

Next, the production of the pseudo liquid crystal cell B in Embodiment 2 or Embodiment 4 of the present invention will be described. Prepare 2 pieces of Alkali-free glass made by Corning: EAGLE XG (thickness 0.7mm, length 157mm×width 98mm size) bonded with adhesive B. At this time, corona treatment is performed on the bonding surface of the glass and the adhesive. Then stick the λ/4 plate 1 made previously on the adhesive B side of the two pieces of glass. At this time, corona treatment was performed on the λ/4 plate 1 and the adhesive B surface. In addition, the adhesive B was bonded to one side of the λ/4 plate of the two glasses. At this time, λ /4 board 1 and adhesive B side are corona treated. Laminate λ/4 plate 1 on the adhesive B side of a piece of glass. At this time, the λ/4 plate 1 and the adhesive B surface were also corona treated.

Finally, one side of the λ/4 plate of one piece of glass is bonded to the adhesive B side of another piece of glass to form a simulated liquid crystal cell B. At this time, corona treatment is performed on the bonding surface of the λ/4 plate 1 surface and the adhesive B.

When the glass longitudinal direction is 0°, the slow axis direction of all the λ/4 plates 1 is made to be 45°.

In Embodiment 2 or Embodiment 4 of the present invention, the initial alignment direction of the analog liquid crystal cell B is tentatively set to -45° with respect to the longitudinal direction of the glass, and the analog liquid crystal cell B is assumed to be when the driving voltage is applied (in white display) The liquid crystal cell.

In addition, on the glass surface of one side of the analog liquid crystal cell A and B manufactured by ZEBRA Co., Ltd. Hi-Mckee blue (MO-150-MC-BL) was used for drawing (Doraemon (Fujiko F. Fujio) The cat-shaped robot that appeared in "Doraemon", the portrait of the character published by Shogakukan).

[Backlight]

Nexus7 (registered trademark) manufactured by Google Inc. took out the LCD panel, and only turned on the backlight to obtain the backlight.

[Example 1-1] (Production of visual recognition side polarizer 1-1)

Paste adhesive B on the protective film C surface of polarizer A. At this time, guarantee The surface of the protective film C and the bonding surface of the adhesive B are subjected to corona treatment. Next, the λ/4 plate 1 is layered on the adhesive B area of the produced polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate 1.

The angle between the absorption axis of the polarizing plate and the λ/4 plate 1 is 45° (when the protective film C is viewed from the protective film A, the λ/4 plate 1 is arranged counterclockwise with respect to the absorption axis of the polarizing plate 1 Slow axis).

Furthermore, the adhesive B is attached to one side of the λ/4 plate of the polarizing plate A. At this time, corona treatment is also performed on the 1 side of the λ/4 plate of the polarizing plate A and the bonding surface of the adhesive B. Then, paste the positive C plate 1 on the adhesive B side 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, glue A on the 1 side of the positive C plate of the polarizing plate A. At this time, corona treatment was also performed on the 1 side of the positive C plate and the bonding surface of the adhesive A. Thus, the viewing side polarizing plate 1-1 is produced.

(Production of Polarized 1-1 on the back side)

Adhesive A is attached to the protective film C surface of the polarizing plate B to form the back side polarizing plate 1-1. At this time, corona treatment was performed on the surface of the protective film C and the bonding surface of the adhesive A.

The produced viewing side polarizing plate 1-1 and the back side polarizing plate 1-1 were cut into a size of 155 mm in length × 96 mm in width. At this time, when viewing with the protective film A of the viewing side polarizing plate 1-1 as the upper side, the absorption axis of the viewing side polarizing plate is cut parallel to the short side direction, and the back side polarizing plate 1-1 When viewing the protective film on the top side, the absorption axis of the back side polarizer 1-1 is parallel to the longitudinal direction. cut.

The visual recognition side polarizing plate 1-1 is attached to the drawing glass surface of the analog liquid crystal cell A, and the back side polarizing plate 1-1 is attached to the reverse glass surface to form an imitation liquid crystal panel. The shaft structure at this time is as shown in Figure 3(b).

The imitation liquid crystal panel manufactured in this way is placed on the manufactured backlight to confirm whether the picture is visible. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 1-2]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 1-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 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 produced in the same manner as in Example 1-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 1-4]

In addition to changing the protective film A of the viewing side polarizer 1-1 to protective film D Other than that, a pseudo liquid crystal panel was produced in the same manner as in Example 1-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 1-5]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 1-4.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 1-6]

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

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 1-7] (Production of visual recognition side polarizer 1-2)

Paste adhesive B on the protective film C surface of polarizer A. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then, the positive C plate 1 is attached to the adhesive B side of the produced polarizing plate A. Sticking The surface of agent B and the bonding surface of positive C plate 1 are corona treated. Furthermore, the adhesive B is attached to the positive C plate 1 surface of the polarizing plate A. At this time, corona treatment was also performed on the positive C plate 1 surface of the polarizing plate A and the bonding surface of the adhesive B. Then, the λ/4 plate 1 is attached to the adhesive B side of the polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate 1. The angle between the absorption axis of the polarizing plate and the λ/4 plate 1 is 45° (when the protective film C is viewed from the protective film A, the λ/4 plate 1 is arranged counterclockwise with respect to the absorption axis of the polarizing plate 1 Of the slow axis).

Finally, glue A on the 1 side of the λ/4 plate of the polarizing plate A. At this time, corona treatment is also performed on the bonding surface of the λ/4 plate and the adhesive A. Thus, the viewing side polarizing plate 1-2 is produced.

The produced viewing side polarizing plate 1-2 and the back side polarizing plate 1-1 were cut into a size of 155 mm in length × 96 mm in width. At this time, when viewing with the protective film A of the viewing side polarizing plate 1-2 as the upper side, the absorption axis of the viewing side polarizing plate is cut parallel to the short side direction, and the back side polarizing plate 1-1 When viewing the B surface of the protective film with the upper side, the absorption axis of the back side polarizing plate 1-1 is cut so as to be parallel to the longitudinal direction.

The visual recognition side polarizing plate 1-2 is attached to the drawing glass surface of the analog liquid crystal cell A, and the back side polarizing plate 1-1 is attached to the reverse glass surface to make an imitation liquid crystal panel. The shaft structure at this time is as shown in Figure 3(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 1-8]

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

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 1-9]

Except for changing the positive C plate 1 to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 1-7.

The imitation liquid crystal panel manufactured in this way is placed on the manufactured backlight to confirm whether the picture is visible. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 1-10]

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

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 1-11]

In addition to changing the positive C-plate 1 to the positive C-plate 2, in accordance with the embodiment 1-10 The same method is used to make imitation LCD panels.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 1-12]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was produced in the same manner as in Example 1-10.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Examples 1-13 to 1-24]

Except that the λ/4 plate 1 of Examples 1-1 to 1-12 was changed to the λ/4 plate 2, the pseudo liquid crystal panels were produced in the same manner. The correspondence between the numbers of the embodiments is shown in Table 1 below.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, all the imitation liquid crystal panels have good visibility even under 10000 Lux.

[Comparative Example 1]

The upper and lower polarizing plates were peeled off from the liquid crystal panel of Nexus 7 (registered trademark) manufactured by Google Inc., and the in-plane retardation value of the liquid crystal cell was 355 nm at a wavelength of 590 nm. Then the polarizing plate A is bonded to the viewing 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. Make a liquid crystal panel. The liquid crystal panel thus made is mounted on Nexus7, and the picture image is displayed on the screen, and it is confirmed whether it can be seen under external light. As a result, the visibility at 5000 Lux is significantly reduced, making it difficult to recognize images.

[Example 2-1] (Production of visual recognition side polarizer 2-1)

Paste adhesive B on the protective film C surface of polarizer A. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then apply the adhesive B area layer λ/4 plate 1 of the produced polarizer A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate 1.

The angle between the absorption axis of the polarizing plate and the λ/4 plate 1 is -45° (when viewing the protective film C from the protective film A, the λ/4 plate is arranged at 45° clockwise relative to the absorption axis of the polarizing plate 1 of the slow axis).

Furthermore, the adhesive B is attached to one side of the λ/4 plate of the polarizing plate A. At this time, corona treatment is also performed on the 1 side of the λ/4 plate of the polarizing plate A and the bonding surface of the adhesive B. Then, paste the positive C plate 1 on the adhesive B side 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, glue A on the 1 side of the positive C plate of the polarizing plate A. At this time, corona treatment was also performed on the 1 side of the positive C plate and the bonding surface of the adhesive A. In this way, the viewing side polarizing plate 2-1 was produced.

(Making of the back side polarizing plate 2-1)

Adhesive A was attached to the protective film C surface of the polarizing plate B to form the back side polarizing plate 2-1. At this time, the protective film C surface and the adhesive surface of the adhesive A Perform corona treatment.

The finished viewing side polarizing plate 2-1 and the back side polarizing plate 2-1 were cut into a size of 155 mm in length × 96 mm in width. At this time, when viewing with the protective film A of the viewing side polarizing plate 2-1 as the upper side, the absorption axis of the viewing side polarizing plate is cut parallel to the short side direction, and the back side polarizing plate 2-1 When viewing the B surface of the protective film from the upper side, the absorption axis of the back side polarizing plate 2-1 is cut so as to be parallel to the longitudinal direction.

The visual recognition side polarizing plate 2-1 is attached to the drawing glass surface of the analog liquid crystal cell B, and the back side polarizing plate 2-1 is attached to the glass surface of the reverse side to form an imitation liquid crystal panel. At this time, the shaft configuration is shown in Figure 4(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 2-2]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 2-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 2-3]

Except for changing the positive C plate 1 to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 2-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 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 produced the pseudo liquid crystal panel.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 2-5]

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

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 2-6]

Except that the positive C plate 1 was changed to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 2-4.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 2-7] (Production of visual recognition side polarizer 2-2)

Paste adhesive B on the protective film C surface of polarizer A. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then layer the positive C plate 1 on the adhesive B area of the finished polarizing plate A. At this time, corona treatment is performed on the bonding surface of the adhesive B and the positive C plate 1. Furthermore, the adhesive B is attached to the positive C plate 1 surface of the polarizing plate A. At this time, corona treatment was also performed on the positive C plate 1 surface of the polarizing plate A and the bonding surface of the adhesive B. Then, the λ/4 plate 1 is attached to the adhesive B side 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 1. The angle between the absorption axis of the polarizing plate and the λ/4 plate 1 is -45° (when viewing the protective film C from the protective film A, the λ/4 plate is arranged at 45° clockwise relative to the absorption axis of the polarizing plate 1 of the slow axis). Finally, glue A on the 1 side of the λ/4 plate of the polarizer A. At this time, corona treatment is also performed on the bonding surface of the λ/4 plate and the adhesive A. Thus, the viewing side polarizing plate 2-2 was produced.

Cut the finished viewing side polarizing plate 2-2 and the back side polarizing plate 2-1 into a size of 155 mm in length × 96 mm in width. At this time, when viewing with the protective film A of the viewing side polarizing plate 2-2 as the upper side, the absorption axis of the viewing side polarizing plate is cut parallel to the short side direction, and the back side polarizing plate 2-1 When viewing the B surface of the protective film from the upper side, the absorption axis of the back side polarizing plate 2-1 is cut so as to be parallel to the longitudinal direction.

Paste the viewing side polarizing plate 2-2 on the drawing glass surface of the analog liquid crystal cell B, and attach the back side polarizing plate to the glass surface on the reverse side 2-1, make an imitation liquid crystal panel. At this time, the shaft configuration is shown in Figure 4(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 2-8]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 2-7.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 2-9]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was produced in the same manner as in Example 2-7.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 2-10]

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

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When confirming visibility under external light, Even under 10000 Lux, the visibility is good.

[Example 2-11]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 2-10.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 2-12]

Except that the positive C plate 1 was changed to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 2-10.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Examples 2-13 to 2-24]

Except for changing the λ/4 plate 1 to the λ/4 plate 2 in Examples 2-1 to 2-12, pseudo liquid crystal panels were produced in the same manner. The correspondence between the numbers of the various embodiments is shown in Table 2 below.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, all the imitation liquid crystal panels have good visibility even under 10000 Lux.

[Example 3-1] (Production of visual recognition side polarizer 3-1)

Paste adhesive B on the protective film C surface of polarizer A. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then, the adhesive B area layer λ/4 plate 1 on the finished polarizing plate A. At this time, to stick The bonding surface of agent B and λ/4 plate 1 is corona treated.

The angle between the absorption axis of the polarizing plate and the λ/4 plate 1 is 45° (when the protective film C is viewed from the protective film A, the λ/4 plate 1 is arranged counterclockwise with respect to the absorption axis of the polarizing plate 1 ) Method of fitting.

Furthermore, the adhesive B is attached to one side of the λ/4 plate of the polarizing plate A. At this time, corona treatment is also performed on the 1 side of the λ/4 plate of the polarizing plate A and the bonding surface of the adhesive B. Then, paste the positive C plate 1 on the adhesive B side 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, glue A on the 1 side of the positive C plate of the polarizing plate A. At this time, corona treatment was also performed on the 1 side of the positive C plate and the bonding surface of the adhesive A. In this way, the viewing side polarizing plate 3-1 is produced.

(Making of the back side polarizing plate 3-1)

Except that the polarizing plate A was changed to the polarizing plate B and the λ/4 plate 1 was changed to the λ/2 plate 1, the back side polarizing plate 3-1 was produced in the same manner as the viewing side polarizing plate 3-1. The angle between the absorption axis of the polarizing plate and the λ/2 plate 1 is 45° (when the protective film B is viewed from the protective film C, the λ/2 plate 1 is arranged counterclockwise with respect to the absorption axis of the polarizing plate 1 ) Method of fitting. The retardation value in the thickness direction at a wavelength of 590nm is the same as the positive C plate of the viewing side polarizing plate and the positive C plate of the back side polarizing plate.

The finished viewing side polarizing plate 3-1 and the back side polarizing plate 3-1 were cut into a size of 155mm in length×96mm in width. At this time, the absorption axis of each polarizer is cut at 90° with respect to the longitudinal direction.

Attach visual recognition to the drawing glass surface of analog LCD unit A The side polarizing plate 3-1, and the back side polarizing plate 3-1 are attached to the glass surface of the reverse side to form an imitation liquid crystal panel. At this time, the shaft configuration is shown in Figure 5(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-2]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 3-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-3]

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

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 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 produced in the same manner as in Example 3-1.

The imitation liquid crystal panel made in this way is arranged on the made On the backlight, confirm whether the picture is visible. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-5]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 3-4.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-6]

Except for changing the positive C plate 1 to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 3-4.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-7] (Making of the back side polarizing plate 3-2)

Paste adhesive B on the protective film C surface of polarizer B. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then, the positive C plate 1 is attached to the adhesive B side of the finished 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. Polarizer Adhesive B is attached to one side of the positive C board of B. At this time, the positive C plate 1 surface of the polarizing plate B and the bonding surface of the adhesive B are also corona treated. Then, the λ/2 plate 1 is attached to the adhesive B side 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. The angle between the absorption axis of the polarizing plate and the λ/2 plate 1 is 45° (when the protective film B is viewed from the protective film C, the λ/2 plate 1 is arranged counterclockwise 45° with respect to the absorption axis of the polarizing plate 1 ) Method for bonding. Finally, glue A on the 1 side of the λ/2 plate of the polarizer B. At this time, corona treatment is 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 3-2 was produced. The retardation value in the thickness direction at a wavelength of 590 nm is the same as that of the positive C plate of the viewing side polarizing plate 3-1 and the positive C plate of the back side polarizing plate.

Cut the finished viewing side polarizing plate 3-1 and the back side polarizing plate 3-2 into a size of 155 mm in length × 96 mm in width. At this time, the absorption axis of each polarizer is cut at 90° with respect to the longitudinal direction.

The visual recognition side polarizing plate 3-1 is attached to the drawing glass surface of the analog liquid crystal cell A, and the back side polarizing plate 3-2 is attached to the glass surface of the reverse side to make an imitation liquid crystal panel. At this time, the shaft configuration is shown in Figure 5(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-8]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 3-7.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-9]

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

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-10]

Except having changed the protective film A of the viewing-side polarizing plate 3-1 to the protective film D, the pseudo liquid crystal panel was produced in the same manner as in Example 3-7.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-11]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 3-10.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-12]

Except that the positive C plate 1 was changed to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 3-10.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-13] (Production of visual recognition side polarizer 3-2)

Paste adhesive B on the protective film C surface of polarizer A. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then, the positive C plate 1 is attached to the adhesive B side of the finished polarizing plate A. At this time, corona treatment is performed on the bonding surface of the adhesive B and the positive C plate 1. Furthermore, the adhesive B is attached to the positive C plate 1 surface of the polarizing plate A. At this time, corona treatment was also performed on the positive C plate 1 surface of the polarizing plate A and the bonding surface of the adhesive B. Then, the λ/4 plate 1 is attached to the adhesive B side 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 1. The angle between the absorption axis of the polarizing plate and the λ/4 plate 1 is 45° (when the protective film C is viewed from the protective film A, the λ/4 plate 1 is arranged counterclockwise with respect to the absorption axis of the polarizing plate 1 ) Method of fitting. Finally, glue A on the 1 side of the λ/4 plate of the polarizer A. At this time, corona treatment is also performed on the bonding surface of the λ/4 plate and the adhesive A. Thus, the viewing side polarizing plate 2 is produced. The retardation value in the thickness direction at a wavelength of 590nm is the same as that of the positive C plate and back side of the viewing side polarizer 3-2 The positive C plate of the polarizing plate 3-1 is the same.

Cut the finished viewing side polarizing plate 3-2 and the back side polarizing plate 3-1 into a size of 155 mm in length × 96 mm in width. At this time, cut separately so that the absorption axis of each polarizer is 90° with respect to the longitudinal direction.

The visual recognition side polarizing plate 3-2 is attached to the drawing glass surface of the analog liquid crystal cell A, and the back side polarizing plate 3-1 is attached to the glass surface of the reverse side to make an imitation liquid crystal panel. At this time, the shaft configuration is shown in Figure 5(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-14]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 3-13.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-15]

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

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-16]

Except that the protective film A of the viewing-side polarizing plate 3-2 was changed to the protective film D, the pseudo liquid crystal panel was produced in the same manner as in Example 3-13.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-17]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 3-16.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-18]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was produced in the same manner as in Example 3-16.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-19]

Cut the finished viewing side polarizer 3-2 and back side polarizer 3-2 It is 155mm in length × 96mm in width. At this time, cut separately so that the absorption axis of each polarizer is 90° with respect to the longitudinal direction.

The visual recognition side polarizing plate 3-2 is attached to the drawing glass surface of the analog liquid crystal cell A, and the back side polarizing plate 3-2 is attached to the glass surface of the reverse side to make an imitation liquid crystal panel. At this time, the shaft configuration is shown in Figure 5(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-20]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 3-19.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-21]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was produced in the same manner as in Example 3-19.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 3-22]

Except that the protective film A of the viewing-side polarizing plate 2 was changed to the protective film D, the pseudo liquid crystal panel was produced in the same manner as in Example 3-19.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-23]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 3-22.

Place such an imitation LCD panel on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 3-24]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was produced in the same manner as in Example 3-22.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Examples 3-25 to 3-48]

Except that the λ/4 plate 1 in Examples 3-1 to 3-24 was changed to a λ/4 plate 2 and the λ/2 plate 1 was changed to a λ/2 plate 2, respectively, pseudo liquid crystal panels were produced in the same manner. The corresponding relationship between the numbers of the various embodiments is shown in Table 3.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, all the imitation liquid crystal panels have good visibility even under 10000 Lux.

[Example 4-1] (Production of visual recognition side polarizer 4-1)

Paste adhesive B on the protective film C surface of polarizer A. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then the adhesive B area layer λ/4 plate 1 on the finished polarizing plate A. At this time, corona treatment was performed on the bonding surface of the adhesive B and the λ/4 plate 1.

The angle between the absorption axis of the polarizing plate and the λ/4 plate 1 is -45° (when viewing the protective film C from the protective film A, the λ/4 plate is arranged at 45° clockwise relative to the absorption axis of the polarizing plate 1) The method of lamination.

Furthermore, the adhesive B is attached to one side of the λ/4 plate of the polarizing plate A. At this time, corona treatment is also performed on the 1 side of the λ/4 plate of the polarizing plate A and the bonding surface of the adhesive B. Then, paste the positive C plate 1 on the adhesive B side 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, glue A on the 1 side of the positive C plate of the polarizing plate A. At this time, corona treatment was also performed on the 1 side of the positive C plate and the bonding surface of the adhesive A. In this way, the viewing side polarizing plate 4-1 is produced.

(Making of the back side polarizing plate 4-1)

Except that the polarizing plate A was changed to the polarizing plate B and the λ/4 plate 1 was changed to the λ/2 plate 1, the back side polarizing plate 4-1 was produced in the same manner as the viewing side polarizing plate 4-1. That is, the λ/2 plate 1 is attached to the protective film C of the polarizing plate B via the adhesive B, then the positive C plate 1 is attached via the adhesive B, and finally the adhesive A is laminated on the positive C plate. The angle between the absorption axis of the polarizing plate and the λ/2 plate 1 is 45° (when the protective film B is viewed from the protective film C, the λ/2 plate 1 is arranged counterclockwise 45° with respect to the absorption axis of the polarizing plate 1 ) Method for bonding. The retardation value in the thickness direction at a wavelength of 590 nm is the same as the positive C plate of the viewing side polarizing plate and the positive C plate of the back side polarizing plate.

The finished viewing side polarizing plate 4-1 and the back side polarizing plate 4-1 are cut into a size of 155 mm in length × 96 mm in width. At this time, cut separately so that the absorption axis of each polarizer is 90° with respect to the longitudinal direction.

The visual recognition side polarizing plate 4-1 is attached to the drawing glass surface of the analog liquid crystal cell B, and the back side polarizing plate 4-1 is attached to the glass surface of the reverse side to form an imitation liquid crystal panel. The shaft structure at this time is shown in Figure 6(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 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 produced in the same manner as in Example 4-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 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 produced in the same manner as in Example 4-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 4-4]

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 produced in the same manner as in Example 4-1.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-5]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 4-4.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-6]

Except for changing the positive C plate 1 to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 4-4.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-7] (Making of the back side polarizing plate 4-2)

Paste adhesive B on the protective film C surface of polarizer B. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then, the positive C plate 1 is layered on the adhesive B area of the finished polarizer B. At this time, corona treatment is performed on the bonding surface of the adhesive B and the positive C plate 1. Furthermore, the adhesive B is attached to the positive C plate 1 surface of the polarizing plate B. At this time, the positive C plate 1 surface of the polarizing plate B and the bonding surface of the adhesive B are also corona treated. Then, the λ/2 plate 1 is attached to the adhesive B side 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. The angle between the absorption axis of the polarizing plate and the λ/2 plate 1 is 45° (when the protective film B is viewed from the protective film C, the λ/2 plate 1 is arranged counterclockwise 45° with respect to the absorption axis of the polarizing plate 1 ) Method for bonding. Finally, glue A on the 1 side of the λ/2 plate of the polarizer B. At this time, corona treatment is 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 4-2 was produced.

Polarizing the finished viewing side polarizer 4-1 and the back side Board 4-2 is cut to a size of 155mm in length×96mm in width. At this time, cut separately so that the absorption axis of each polarizer is 90° with respect to the longitudinal direction.

The visual recognition side polarizing plate 4-1 is attached to the drawing glass surface of the analog liquid crystal cell B, and the back side polarizing plate 4-2 is attached to the glass surface of the reverse side to form an imitation liquid crystal panel. The shaft structure at this time is shown in Figure 6(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 4-8]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 4-7.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 4-9]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was produced in the same manner as in Example 4-7.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 4-10]

Except having changed the protective film A of the viewing side polarizing plate 4-1 to the protective film D, it carried out similarly to Example 4-7, and produced the pseudo liquid crystal panel.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-11]

Except for changing the positive C plate 1 to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 4-10.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-12]

Except that the positive C plate 1 was changed to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 4-10.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-13] (Production of visual recognition side polarizer 4-2)

Paste adhesive B on the protective film C surface of polarizer A. At this time, corona treatment is performed on the bonding surface of the protective film C surface and the adhesive B. Then made The adhesive B area layer of polarizing plate A is positive C plate 1. At this time, corona treatment is performed on the bonding surface of the adhesive B and the positive C plate 1. Furthermore, the adhesive B is attached to the positive C plate 1 surface of the polarizing plate A. At this time, corona treatment was also performed on the positive C plate 1 surface of the polarizing plate A and the bonding surface of the adhesive B. Then, the λ/4 plate 1 is attached to the adhesive B side 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 1. The angle between the absorption axis of the polarizing plate and the λ/4 plate 1 is -45° (when viewing the protective film C from the protective film A, the λ/4 plate is arranged at 45° clockwise relative to the absorption axis of the polarizing plate 1) The method of lamination. Finally, glue A on the 1 side of the λ/4 plate of the polarizer A. At this time, corona treatment is also performed on the bonding surface of the λ/4 plate and the adhesive A. Thus, the viewing side polarizing plate 4-2 was produced.

Cut the finished visual recognition side polarizing plate 4-2 and the back side polarizing plate 4-1 into a size of 155 mm in length × 96 mm in width. At this time, cut separately so that the absorption axis of each polarizer is 90° with respect to the longitudinal direction.

The visual recognition side polarizing plate 4-2 is attached to the drawing glass surface of the analog liquid crystal cell B, and the back side polarizing plate 4-1 is attached to the glass surface of the reverse side to form an imitation liquid crystal panel. The shaft structure at this time is shown in Figure 6(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 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 produced in the same manner as in Example 4-13.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 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 produced in the same manner as in Example 4-13.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 4-16]

Except having changed the protective film A of the viewing side polarizing plate 4-2 to the protective film D, it carried out similarly to Example 4-13, and produced the pseudo liquid crystal panel.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-17]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 4-16.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-18]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was produced in the same manner as in Example 4-16.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-19]

Cut the finished viewing side polarizing plate 4-2 and the back side polarizing plate 4-2 into a size of 155 mm in length × 96 mm in width. At this time, cut separately so that the absorption axis of each polarizer is 90° with respect to the longitudinal direction.

The visual recognition side polarizing plate 4-2 is attached to the drawing glass surface of the analog liquid crystal cell B, and the back side polarizing plate 4-2 is attached to the glass surface of the reverse side to make an imitation liquid crystal panel. The shaft structure at this time is shown in Figure 6(b).

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 4-20]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 4-19.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When confirming visibility under external light, Even under 7500Lux, the visibility is good.

[Example 4-21]

Except for changing the positive C plate 1 to the positive C plate 3, a pseudo liquid crystal panel was produced in the same manner as in Example 4-19.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 7500 Lux.

[Example 4-22]

Except having changed the protective film A of the viewing side polarizing plate 4-2 to the protective film D, it carried out similarly to Example 4-19, and produced the pseudo liquid crystal panel.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-23]

Except that the positive C plate 1 was changed to the positive C plate 2, the pseudo liquid crystal panel was produced in the same manner as in Example 4-22.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Example 4-24]

Except that the positive C plate 1 was changed to the positive C plate 3, the pseudo liquid crystal panel was produced in the same manner as in Example 4-22.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, the visibility is good even under 10000 Lux.

[Examples 4-25 to 4-48]

Except that the λ/4 plate 1 in Examples 4-1 to 4-24 was changed to a λ/4 plate 2 and the λ/2 plate 1 was changed to a λ/2 plate 2, respectively, pseudo liquid crystal panels were produced in the same manner. The correspondence between the numbers of the various embodiments is shown in Table 4 below.

The imitation liquid crystal panel manufactured in this way is arranged on the manufactured backlight to confirm whether the picture is visible or not. When the visibility is confirmed under external light, all the imitation liquid crystal panels have good visibility even under 10000 Lux.

(Industrial availability)

According to the polarizing plate set of the present invention, it is useful to provide a liquid crystal display device that can suppress the reflection of external light and can ensure good visibility even in a strong external light environment 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

5: The absorption axis of the polarizer

30, 50: Polarizing plate

34: λ/4 plate

35: positive C plate

60: LCD unit

Claims (30)

A set of polarizing plates, including a viewing side polarizing plate and a back side polarizing plate, the viewing side polarizing plate and the back side polarizing plate are respectively attached to an IPS mode liquid crystal cell with an in-plane phase difference of 100nm to 200nm The absorption axis of the aforementioned visible side polarizing plate is slightly orthogonal to the absorption axis of the aforementioned back side polarizing plate; the aforementioned visible side polarizing plate has a polarizer and a λ/4 plate; the aforementioned visible side polarizing plate has an absorption axis and The included angle of the slow axis of the λ/4 plate is slightly 45°; and the slow axis of the λ/4 plate should be arranged in a slightly orthogonal relationship with respect to the initial alignment direction of the IPS mode liquid crystal cell. The set of polarizing plates described in the first item of the scope of patent application, wherein the visible side polarizing plate includes a positive C plate to be arranged between the liquid crystal cell and the λ/4 plate. The set of polarizing plates described in the first item of the scope of patent application, wherein the viewing side polarizing plate includes a positive C plate to be arranged between the polarizing plate of the viewing side polarizing plate and the λ/4 plate. For the polarizing plate set described in item 2 or 3 of the scope of the 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 an IPS mode liquid crystal cell with an in-plane phase difference of 100 nm to 200 nm with a polarizing plate set as described in any one of items 1 to 4 of the scope of patent application. As 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 set of polarizing plates, including a viewing side polarizing plate and a back side polarizing plate, the viewing side polarizing plate and the back side polarizing plate are respectively attached to an IPS mode liquid crystal cell with an in-plane phase difference of 400nm to 500nm The absorption axis of the aforementioned visible side polarizing plate is slightly orthogonal to the absorption axis of the aforementioned back side polarizing plate; the aforementioned visible side polarizing plate has a polarizer and a λ/4 plate; the aforementioned visible side polarizing plate has an absorption axis and The included angle of the slow axis of the λ/4 plate is slightly 45°; and the slow axis of the λ/4 plate should be arranged in a slightly parallel relationship with the initial alignment direction of the IPS mode liquid crystal cell. According to the set of polarizing plates described in item 7 of the scope of patent application, the visible-side polarizing plate includes a positive C plate to be arranged between the liquid crystal cell and the λ/4 plate. The set of polarizing plates described in item 7 of the scope of patent application, wherein the visible-side polarizing plate includes a positive C plate to be arranged between the polarizing plate and the λ/4 plate. The polarizing plate set as described in item 8 or 9 of the scope of patent application, wherein the phase difference in the thickness direction of the positive C plate is -50nm to -150nm. An IPS mode liquid crystal display device is formed by arranging IPS mode liquid crystal cells with an in-plane phase difference of 400 nm to 500 nm with a polarizing plate set as described in any one of the 7th to 10th patent applications. Such as 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 less than 15 inches diagonally. A set of polarizing plates, including a viewing side polarizing plate and a back side polarizing plate, the viewing side polarizing plate and the back side polarizing plate are respectively attached to an IPS mode liquid crystal cell with an in-plane phase difference of 100nm to 200nm The absorption axis of the aforementioned viewing side polarizing plate is slightly parallel to the absorption axis of the aforementioned back side polarizing plate; the aforementioned viewing side polarizing plate has a first polarizer and a λ/4 plate; the aforementioned λ/4 plate is to be 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 slightly 45°; the back side polarizer has a second polarizer and λ /2 plate; the angle between the absorption axis of the back side polarizing plate and the slow axis of the λ/2 plate is slightly 45°; and the slow axis of the λ/4 plate is slightly orthogonal to the slow axis of the λ/2 plate ; The slow axis of the λ/4 plate relative to the initial alignment direction of the IPS mode liquid crystal cell should be arranged in a slightly orthogonal relationship. The set of polarizing plates described in item 13 of the scope of patent application, wherein the visible side polarizing plate includes a positive C plate to be arranged between the liquid crystal cell and the λ/4 plate; the back side polarizing plate includes A positive C plate to be placed between the liquid crystal cell and the λ/2 plate. As the set of polarizing plate described in item 13 of the scope of patent application, the former The visible side polarizing plate includes a positive C plate to be arranged between the liquid crystal cell and the λ/4 plate; the back side polarizing plate includes a positive C plate to be arranged between the second polarizer and the λ/2 plate Positive C board. The set of polarizing plates described in item 13 of the scope of patent application, wherein the visible side polarizing plate includes a positive C plate to be arranged between the first polarizer and the λ/4 plate; the back side polarizing plate It contains a positive C plate to be arranged between the liquid crystal cell and the λ/2 plate. The set of polarizing plates described in item 13 of the scope of patent application, wherein the visible side polarizing plate includes a positive C plate to be arranged between the first polarizer and the λ/4 plate; the back side polarizing plate It includes a positive C plate to be arranged between the second polarizer and the λ/2 plate. The polarizing plate set according to any one of the 14th to 17th patents, wherein the positive C plate of the aforementioned visible side polarizing plate and the positive C plate of the aforementioned back side polarizing plate are in the thickness direction The phase difference values are slightly equal. According to the set of polarizing plates described in any one of items 14 to 18 in the scope of the 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 IPS mode liquid crystal cells with an in-plane phase difference of 100 nm to 200 nm with a polarizing plate set as described in any one of the scope of patent application 13 to 19. The IPS mode liquid crystal display device described in item 20 of the scope of patent application, wherein the size of the IPS mode liquid crystal display device is less than 15 inches diagonally. A set of polarizing plates, including a viewing side polarizing plate and a back side polarizing plate, the viewing side polarizing plate and the back side polarizing plate are respectively attached to an IPS mode liquid crystal cell with an in-plane phase difference of 400nm to 500nm The absorption axis of the aforementioned viewing side polarizing plate is slightly parallel to the absorption axis of the aforementioned back side polarizing plate; the aforementioned viewing side polarizing plate has a first polarizer and a λ/4 plate; the aforementioned λ/4 plate is to be 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 slightly 45°; the back side polarizer has a second polarizer and λ /2 plate; the angle between the absorption axis of the back-side polarizing plate and the slow axis of the λ/2 plate is slightly 45°; the slow axis of the λ/4 plate is slightly orthogonal to the slow axis of the λ/2 plate; In addition, the slow axis of the λ/4 plate should be arranged in a substantially parallel relationship with the initial alignment direction of the IPS mode liquid crystal cell. The set of polarizing plates described in item 22 of the scope of the patent application, wherein the visible side polarizing plate includes a positive C plate to be arranged between the liquid crystal cell and the λ/4 plate; the back side polarizing plate includes To be configured in the aforementioned liquid crystal cell And the positive C plate between the aforementioned λ/2 plate. The set of polarizing plates described in item 22 of the scope of the patent application, wherein the visible side polarizing plate includes a positive C plate to be arranged between the liquid crystal cell and the λ/4 plate; the back side polarizing plate includes The positive C plate should be placed between the second polarizer and the λ/2 plate. The set of polarizing plates described in item 22 of the scope of patent application, wherein the visible side polarizing plate includes a positive C plate to be arranged between the first polarizer and the λ/4 plate; the back side polarizing plate It contains a positive C plate to be arranged between the liquid crystal cell and the λ/2 plate. The set of polarizing plates described in item 22 of the scope of patent application, wherein the visible side polarizing plate includes a positive C plate to be arranged between the first polarizer and the λ/4 plate; the back side polarizing plate It includes a positive C plate to be arranged between the second polarizer and the λ/2 plate. The polarizing plate set according to any one of the 23 to 26 patents, wherein the positive C plate of the visible side polarizing plate and the positive C plate of the back side polarizing plate are in the thickness direction The phase difference values are slightly equal. According to the set of polarizing plates described in any one of items 23 to 27 in the scope of the 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, which has an in-plane phase difference value The 400nm to 500nm IPS mode liquid crystal cell is formed by configuring the polarizing plate set as described in any one of the 22nd to 28th patent applications. For the IPS mode liquid crystal display device described in item 29 of the scope of patent application, the size of the IPS mode liquid crystal display device is less than 15 inches diagonally.

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