JP2003131190A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semitransimissive liquid crystal display device with which high luminance is attainable and further a high contrast ratio and sufficient color compensation is obtainable in both reflective and transmissive applications. SOLUTION: In the semitransmissive liquid crystal display device with a first optical retardation plate 11, a second optical retardation plate 12 and a polarizing plate 13 successively stacked on one principal surface of a liquid crystal panel 2, with a third optical retardation plate 14, a fourth optical retardation plate 15 and a polarizing plate 16 successively stacked on the other principal surface thereof and with a backlight 8 disposed on the polarizing plate 16, the twist angle and the optical path difference Δnd of the liquid crystal, the optical path differences Δnd and the stretch axes of the first to the fourth optical retardation plates and the absorption axes of the first and the second polarizing plates are specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-transmissive liquid crystal display device provided with a semi-transmissive film, and particularly to the design of a liquid crystal panel (twist angle, optical path difference Δnd), optical path difference Δ of a retardation film.
The present invention relates to a liquid crystal display device obtained by optimizing the nd, the sticking angle, and the sticking angle of a polarizing plate.

[0002]

2. Description of the Related Art In recent years, a semi-transmissive liquid crystal display device which can be used both outdoors and indoors has been developed for portable information terminal applications.

This semi-transmissive liquid crystal display device may be used as a reflective device by external illumination such as sunlight or a fluorescent lamp, or may be used as a transmissive device in which a backlight is mounted as internal illumination. In order to have the function of both, the semi-transmissive reflection plate is arranged on the back surface of the liquid crystal panel, and the polarizing plate and the backlight are sequentially arranged on the back surface side of the semi-transmission reflection plate. A structure has been proposed in which a retardation plate for compensating coloring during transmissive display is arranged between the plate and the plate. (JP-A-8-2924)
13) FIG. 4 is a schematic sectional view of a conventional STN type simple matrix type transflective liquid crystal display device 1.

In this transflective liquid crystal display device 1, 2
Is a liquid crystal panel, in which a large number of transparent electrodes are arranged in parallel on the respective inner surfaces of two glass substrates arranged opposite to each other,
Further, both glass substrates are arranged so that the two parallel transparent electrode groups are orthogonal to each other between the two substrates, and an alignment film is formed on each of the parallel transparent electrode groups. The structure has a 270 ° twist arrangement.

Further, a retardation plate 3 and a polarizing plate 4 are sequentially stacked on one main surface of the liquid crystal panel 2, and a retardation plate 5, a polarizing plate 6 and a semi-transmissive reflecting plate 7 are stacked on the other main surface. A back light 8 is arranged on the semi-transmissive film 7 in this order.

When the liquid crystal display device 1 having the above structure is used as a reflection type device, the semi-transmissive reflection film 7 is a reflection film, and when it is used as a transmission type device, it is a transmission film.

[0007]

However, when the transflective liquid crystal display device 1 having the above structure is used as a reflective type, the thickness of the glass substrate existing between the liquid crystal layer of the liquid crystal panel 2 and the transflective plate 7. However, there is a problem in that parallax occurs, which causes a phenomenon in which an image looks double, and further, color reproducibility deteriorates due to color mixing.

Further, design specifications for achieving good performance of the transflective liquid crystal display device 1 for both the reflective type and the transmissive type have not yet been sufficiently studied, and further research and development is required. It was being done.

The present invention has been studied in view of the above circumstances, and an object thereof is to achieve high brightness and to obtain a high contrast ratio and sufficient color compensation in both reflective and transmissive applications. It is to provide a transflective liquid crystal display device.

[0010]

A liquid crystal display device according to the present invention comprises two transparent members each having a transparent electrode and an alignment layer sequentially laminated on a transparent substrate and having a twist angle of 240 to 260 °.
Of a liquid crystal panel in which pixels are arranged in a matrix by laminating via a super nematic liquid crystal having an optical path difference Δnd of 800 to 900 nm, and a semitransparent film is arranged between a transparent substrate and a transparent electrode. On the one main surface side, a first retardation plate having an optical path difference Δnd of 680 to 700 nm, a second retardation plate having an optical path difference Δnd of 570 to 590 nm, and a first polarizing plate are sequentially stacked, and the other main surface side And a third retardation plate having an optical path difference Δnd of 130 to 150 nm, a fourth retardation plate having an optical path difference Δnd of 265 to 275 nm, and a second polarizing plate.
While stacking backlights in sequence, the stretching axis of the first retardation plate was set to 50 to 60 ° and the second retardation was adjusted from the display surface with reference to the average value of the rubbing directions on both surfaces of the super nematic liquid crystal. The stretching axis of the plate is 165-1
At 75 °, the absorption axis of the first polarizing plate at 5 to 15 °, the stretching axis of the third retardation plate at 160 to 170 °, the stretching axis of the fourth retardation plate at 40 to 50 °, and the second The absorption axis of the polarizing plate is 145
It is characterized in that it is set to ˜155 °.

In another liquid crystal display device of the present invention, two transparent members each having a transparent electrode and an alignment layer sequentially laminated on a transparent substrate are provided with a twist angle of 240 to 260 ° and an optical path difference Δnd.
The optical path difference Δnd is 6 on the one main surface side of the liquid crystal panel in which the pixels are arranged in a matrix by laminating it through a super nematic liquid crystal having a thickness of 800 to 900 nm.
The first retardation plate of 80 to 700 nm and the optical path difference Δnd are 5
A second retardation plate having a thickness of 70 to 590 nm and a first polarizing plate are sequentially stacked, and the optical path difference Δnd is 130 to 1 on the other main surface side.
The third retardation plate of 50 nm and the optical path difference Δnd is 265 to 2
A 75 nm fourth retardation film, a second polarizing plate and a backlight are sequentially stacked, and the electrode on the other main surface side is formed by a semi-transmissive film. Further, the average of rubbing directions on both surfaces of the super nematic liquid crystal is obtained. The stretching axis of the first retardation plate is 50 to 60 when viewed from the display surface with reference to the value.
, The stretching axis of the second retardation plate is 165 to 175 °, the absorption axis of the first polarizing plate is 5 to 15 °, the stretching axis of the third retardation plate is 160 to 170 °, and the fourth position. The stretching axis of the phase difference plate is 40
The absorption axis of the second polarizing plate is set to ˜50 ° and 145 to 155 °.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The liquid crystal display device of the present invention will be described below with reference to FIGS. 1 and 2, and another liquid crystal display device of the present invention with reference to FIG.

(Example 1) FIG. 1 is a schematic sectional view of a liquid crystal display device 9, and FIG. 2 is an enlarged sectional view of a main part of the liquid crystal display device 9. The same members as those of the transflective liquid crystal display device 1 shown in FIG. 4 are designated by the same reference numerals.

In FIG. 1, a first retardation plate 11 made of polycarbonate or the like is provided on one main surface of the liquid crystal panel 2,
The second retardation plate 12 made of polycarbonate and the iodine type polarizing plate 13 are sequentially stacked, and the third retardation plate 14 made of polycarbonate or the like and the fourth retardation plate 15 made of polycarbonate or the like on the other main surface. The iodine type polarizing plate 16 is sequentially stacked. These are attached using an adhesive material made of an acrylic material. Further, the backlight 8 is arranged on the polarizing plate 16.

As the first retardation plate 11, the second retardation plate 12, the third retardation plate 14, and the fourth retardation plate 15, those obtained by stretching a synthetic resin film such as polycarbonate are used.

Preferably, the light-scattering plate member 10 is arranged between the liquid crystal panel 2 and the first retardation plate 11.
For example, there is a light scattering film such as SK80 manufactured by Sumitomo Chemical Co., Ltd., in which beads and the like are contained in an adhesive material.

Next, the structure of the liquid crystal panel 2 shown in FIG. 2 will be described. Reference numeral 17 denotes a segment side glass substrate, 18 denotes a common side glass substrate, and a plurality of transparent electrodes 19 made of ITO and arranged in parallel on the glass substrate 17 and SiO.
The insulating layer 20 made of 2 and the alignment film 21 made of polyimide resin rubbed in a certain direction are sequentially formed.
The insulating layer 20 may not be formed.

A semi-transmissive film 22 is formed on the other glass substrate 18.
And a color filter 23 and a black matrix 24 are formed on the semi-transmissive film 22. In order to easily form the color filter 23 and the like, the semi-transmissive film 22
The color filter 23 may be provided on the SiO ₂ layer.

The color filter 23 is arranged for each pixel, and a black matrix 24 of chromium metal or a photosensitive resist is formed between the color filters 23.

The black matrix 24 is not essential, and the black matrix 24 may not be provided.

The semi-transmissive film 22 has both light transmissive properties and light reflective properties, and it prevents the phase difference from occurring when sandwiched between two polarizing plates. Further, the semi-transmissive film 22 may be specular or diffusive, and in order to have the diffusive property, an uneven shape is provided with a resin or the like, and the semi-transmissive film is formed thereon. However, when the light-scattering semi-transmissive film 22 is formed in this way, the light-scattering plate-like body 10 as described above may not be provided.

The semi-transmissive film 22 is formed of a metal layer or a dielectric layer. When using a metal layer, Al, Cr, S
In order to satisfy both the light transmissivity and the light reflectivity, it is preferable that the film thickness is 50 to 300 Å, which is composed of US system and Ag.
Further, when importance is attached to light transmittance, 50 to 150 Å is preferable, and when importance is attached to light reflectance, 150 to 300 Å is preferable.

When the dielectric layer is used, for example, a film in which a TiO ₂ film of a high refractive index material and a SiO ₂ film of a low refractive index material are alternately laminated may be used.
It should be formed with a thickness of Å.

The semi-transmissive film 22 having such a structure is provided on a transparent support plate such as a glass substrate. Further, it is preferable that the metal layer is formed with a single material at a low cost, and the sputtering method can easily and stably form a high-quality film.

The color filter 23 is formed by a pigment dispersion method, that is, a photosensitive resist prepared in advance with a pigment is applied on a substrate and photolithography is performed. The R, G, and B displays in the figure are red,
The color filter 23 is colored green and blue.

An overcoat layer 25 made of acrylic resin and a plurality of transparent electrodes 26 made of ITO arranged in parallel are formed thereon. The transparent electrode 26 is orthogonal to the transparent electrode 19. Moreover, the alignment film 27 made of polyimide resin rubbed in a certain direction is formed on the transparent electrode 26. The transparent electrode 26 and the alignment film 2
An insulating layer made of SiO ₂ or the like may be interposed between the insulating layer 7 and the insulating layer 7.

The glass substrates 17 and 18 formed as described above are attached to each other with a sealant 28 via a liquid crystal layer 28 made of chiral nematic liquid crystal twisted at an angle of 200 to 270 °, for example. Furthermore,
A large number of spacers 30 are arranged between the two glass substrates 17 and 18 in order to keep the thickness of the liquid crystal layer 28 constant.

In the liquid crystal panel 2 of this example, the insulating layer 2
0, the overcoat layer 25 is provided, but it may not be provided.

Thus, when the liquid crystal display device 9 having the above-mentioned configuration is used as a reflection type, the irradiation light from external illumination such as sunlight or a fluorescent lamp is emitted from the first polarizing plate 13, the second retardation plate 12 and the first position. Phase difference plate 11, light-scattering plate member 10, and liquid crystal panel 2
And then reflected by the semi-transmissive film 22, the reflected light passes through the liquid crystal panel 2, and the light-scattering plate member 10, the first retardation plate 11, the second retardation plate 12 and the Since the light passes through the one polarizing plate 13, it does not pass through the glass substrate 18, the third retardation plate 14, the fourth retardation plate 15, and the second polarizing plate 16, so that the brightness is increased.

In particular, when the semi-transmissive film 22 is formed on the glass substrate 18 as described above, it does not pass through the glass substrate 18 even when it is used as a reflection type, and thus the display due to the glass substrate 18 is doubled. There is no phenomenon that looks like.

When the liquid crystal display device 9 is used as a transmissive type, the irradiation light of the backlight 8 is the second polarizing plate 16.
, The fourth retardation plate 15, the third retardation plate 14 and the semi-transmissive film 22 in order, and the light scattering plate-like body 10, the first retardation plate 11 and the second retardation film 2 through the liquid crystal panel 2. The phase difference plate 12 and the first polarizing plate 13 are sequentially passed, whereby the second polarizing plate 1
The light that has passed through 5 is the fourth retardation plate 15 and the third retardation plate 14
As a result, the polarization state is changed, and as a result, the liquid crystal panel 2 used in the reflection type can be used in the transmission type under the same conditions.

That is, the twist angle of the liquid crystal layer 28, the optical path difference Δnd of the liquid crystal layer 28, the absorption axes of the polarizing plates 13 and 16, and the optical path difference Δnd of the phase difference plates 11, 12, 14, and 15.
By setting the stretching axis to the predetermined range defined in the present invention, sufficient color compensation was obtained in both the reflective type and the transmissive type, and high-saturation display was realized.

Moreover, according to the liquid crystal display device 9 of the present invention, when the semi-transmissive film 22 has a mirror surface property, the light-scattering plate member 10 is used as the liquid crystal panel 2 and the first retardation plate 11. When it is used as a reflection type by being provided between the light-scattering plate-like body 10 and the semi-transmissive film 22, the light-scattering plate-like body 10 scatters in a direction other than the regular reflection direction. Is enlarged, display characteristics at the time of reflection are improved, and by disposing the semi-transmissive film 22 inside, parallax is eliminated, and deterioration of color reproducibility due to double image and color mixture is eliminated.

Example 2 Another liquid crystal display device 31 of the present invention will be described with reference to FIG. The liquid crystal display device 9 of (Example 1)
The same reference numerals are given to the same portions as.

In this liquid crystal display device 31, a transparent electrode 19 is used instead of the semi-transmissive film 22 provided in the liquid crystal display device 9.
Can be formed by using a semi-transmissive film (indicated as an electrode 19 'in the drawing), and can also be used in this manner to reduce the cost.
The semi-transmissive film electrode 19 'is formed of a metal film. However, the location where the backlight 8 is provided is on the opposite side of the liquid crystal display device 9.

When the liquid crystal display device 31 having the above structure is also used as a reflection type, the brightness is increased, and when used as a transmission type, the liquid crystal panel used as a reflection type is also used as a transmission type under the same conditions. Yes, stable and clear color display is possible in both reflective and transmissive types.
Moreover, as in Example 1, the double appearance phenomenon disappeared.
Also, good display was obtained when the panel was viewed through polarized sunglasses.

Next, the numerical limitation defined in the liquid crystal display devices 9 and 31 of the present invention will be described in detail.

[Preferable Conditions] FIG. 5 shows that the liquid crystal layer 28 has a twist angle of 240 to 260 ° and an optical path difference Δnd of 800 to 90.
Each retardation film 1 is set to 0 nm and the average rubbing direction of both rubbing directions of both alignment films 21 and 27 is used as a reference.
1, 12, 14, 15 stretching axes and respective polarizing plates 13, 1
The case where each angle (counterclockwise) of the absorption axis of No. 6 is viewed from the display surface is shown. In addition, the retardation plates 11 and 12, the first polarizing plate 13
Is a phase difference plate 14, 1 on the opposite substrate of the semi-transmissive film forming substrate.
5. The second polarizing plate 16 is arranged on the semi-transmissive film forming substrate.

According to the present invention, the following settings are made.

First retardation plate 11 Optical path difference Δnd: 680 to 700 nm, preferably 685 to
695 nm Stretching axis: 50-60 °, preferably 52-58 ° Second retardation plate 12 optical path difference Δnd: 570-590 nm, preferably 575
685 nm Stretching axis: 165 to 175 °, preferably 167 to 173 ° First polarizing plate 13 absorption axis: 5 to 15 °, preferably 7 to 13 ° Third retardation plate 14 Optical path difference Δnd: 130 to 150 nm, Suitably 135-
143 nm Stretching axis: 160 to 170 °, preferably 162 to 168 ° Fourth retardation plate 15 optical path difference Δnd: 265 to 285 nm, preferably 270 to 270 nm.
280 nm Stretching axis: 40 to 50 °, preferably 42 to 48 ° Second polarizing plate 16 absorption axis: 145 to 155 °, preferably 147 to 153 ° Used as a reflection type by setting as described above. In the case, a high brightness was achieved, and a high contrast (sufficient color compensation) was obtained. Even when the liquid crystal display device used as the reflective type was used as the transmissive type, sufficient color compensation was obtained, and high-saturation display was realized in either the reflective type or the transmissive type.

[0040]

Example 1 When the liquid crystal display devices 9 and 31 were used in a transmissive type and a reflective type, the luminance was measured and the results shown in Table 1 were obtained. As a comparative example, the transflective liquid crystal display device 1 of FIG. 4 was used.

For measurement of chromaticity and luminance, CS manufactured by Minolta
-100 is used, in the case of the transmissive type, the same backlight having constant chromaticity and luminance is used, and in the case of the reflective type, the same light source is applied to the liquid crystal panel at a constant angle. , And each chromaticity and brightness were measured.

[0042]

[Table 1]

Regarding the luminance, the transmission type and the reflection type of the comparative example were set to 1.00 and expressed as a relative value.

As is clear from the results shown in Table 1, according to the liquid crystal display devices 9 and 31 of the present invention, both the transmissive type and the reflective type were able to increase the brightness. In particular, the liquid crystal display device 31 of Example 2 is
It was possible to increase the brightness in both the transmissive type and the reflective type.

Example 2 In this example, in the liquid crystal display device 9 of Example 1, the first retardation plate 11 (optical path difference Δn
d: 680 to 700 nm) stretching axis, second retardation plate 12
(Optical path difference Δnd: 570-590 nm) stretching axis, first polarizing plate 13 absorption axis, third retardation plate 14 (optical path difference Δn
d: 130 to 150 n) stretching axis, fourth retardation plate 15
Various liquid crystal display devices 9 were manufactured by changing the stretching axis of (optical path difference Δnd: 265 to 285n) and the absorption axis of the second polarizing plate 16 in various ways. 1 to 25 were obtained. Then, when the contrast of each of these devices was measured by the measuring method used in (Example 1), the results shown in Table 2 were obtained.

[0046]

[Table 2]

As is clear from this result, the device No. 1 of the present invention was used. 1-3, 6, 7, 10, 11, 14, 15, 1
Regarding 8, 19, 22, and 23, excellent values were obtained in which the contrast during reflection was 12.5 or more and the contrast during transmission was about 20 or more.

On the other hand, the device No. In Nos. 4 and 5, the first polarizing plate is outside the scope of the present invention, and the device No. In Nos. 8 and 9, the second retardation plate is outside the scope of the present invention, and the device No. 12, 13
The first retardation plate is outside the scope of the present invention, and the device No. 1
In Nos. 6 and 17, the third retardation plate is outside the scope of the present invention, and the device No. In Nos. 20 and 21, the fourth retardation plate is out of the range of the present invention, so that the contrast during reflection and the contrast during transmission are low. Further, the device No. 24, 25
Also for the second polarizing plate is outside the scope of the present invention,
The contrast during transmission is low.

Example 3 In this example, in the liquid crystal display device 31 of Example 2, the first retardation plate 11 (optical path difference Δn
d: 680 to 700 nm) stretching axis, second retardation plate 12
(Optical path difference Δnd: 570-590 nm) stretching axis, first polarizing plate 13 absorption axis, third retardation plate 14 (optical path difference Δn
d: 130 to 150 n) stretching axis, fourth retardation plate 15
The liquid crystal display device 31 was manufactured by changing the stretching axis of (optical path difference Δnd: 265 to 285n) and the absorption axis of the second polarizing plate 16 in various ways. 26-50
Got Then, when the contrast of each of these devices was measured by the measuring method used in (Example 1), the results shown in Table 3 were obtained.

[0050]

[Table 3]

As is clear from this result, the device No. 1 of the present invention was used. 26-28, 31, 32, 35, 36, 39,
For 40, 43, 44, 47 and 48, excellent values were obtained in which the contrast during reflection was 15.2 or more and the contrast during transmission was about 21 or more.

On the other hand, the device No. In Nos. 29 and 30, the first polarizing plate is outside the scope of the present invention, and the device No. 33, 34
The second retardation plate is outside the scope of the present invention, and the device No. Three
In Nos. 7 and 38, the first retardation plate is outside the scope of the present invention, and the device No. In Nos. 41 and 42, the third retardation plate is outside the scope of the present invention, and the device No. In 45 and 46, the fourth retardation plate is out of the range of the present invention, so that the contrast at the time of reflection and the contrast at the time of transmission are low. Further, the device No. Four
Regarding 9 and 50 as well, the second polarizing plate is out of the range of the present invention, so that the contrast during transmission is low.

The present invention is not limited to the above-mentioned embodiment, and various modifications and improvements may be made without departing from the scope of the present invention.

[0054]

As described above, according to the present invention, two transparent members formed by sequentially stacking a transparent electrode and an alignment layer on a transparent substrate are provided via a super nematic liquid crystal having a twist angle and Δnd defined. A first phase difference in which an optical path difference Δnd and a stretching axis are defined on the one main surface side of a liquid crystal panel in which pixels are arranged in a matrix form by bonding and a semi-transmissive film is provided between a transparent substrate and a transparent electrode. Plate, a second retardation plate that defines the optical path difference Δnd and the stretching axis, and a first polarizing plate that defines the absorption axis in this order, and the third phase difference that defines the optical path difference Δnd and the stretching axis on the other main surface side. A plate, a fourth retardation plate that defines the optical path difference Δnd and the stretching axis, a first polarizing plate that defines the absorption axis, and a backlight are sequentially stacked, so that when used as a reflection type, external illumination is used. The irradiation light by the first polarization plate, the second retardation plate and the first phase Sequentially passes through the difference plate, the light-scattering plate and the liquid crystal panel, and is further reflected by the semi-transmissive film,
When the reflected light passes through the liquid crystal panel, it does not pass through the other second polarizing plate, which increases the brightness. On the other hand, when used as a transmissive type, the light emitted from the backlight is the second polarized light. The plate, the third retardation plate, the fourth retardation plate and the semi-transmissive film are sequentially passed, the liquid crystal panel is passed, and the second retardation plate, the first retardation plate and the first polarizing plate are sequentially passed, and The light passing through the polarizing plate changes the polarization state with the retardation film, and as a result, the panel used in the above reflection type can be used in the transmission type under the same conditions,
Furthermore, the twist angle of the liquid crystal layer, the optical path difference Δnd of the liquid crystal layer,
By setting the absorption axis of the polarizing plate, the optical path difference Δnd of the retardation plate, and the stretching axis within a predetermined range, stable and clear color display can be achieved in both reflective and transmissive types, and color compensation is sufficient. As a result, a high-performance transflective liquid crystal display device having improved characteristics to the extent that both reflective and transmissive functions can be satisfied can be provided.

In still another liquid crystal display device of the present invention, a super nematic liquid crystal, a first polarizing plate, a first retardation plate, a second retardation plate, a third retardation plate, a fourth retardation plate. By defining the second polarizing plate in the same manner, the brightness becomes high when used as a reflective type, while the liquid crystal panel used as a reflective type when used as a transmissive type becomes a transmissive type under the same conditions. It can also be used as a reflective type or transmissive type, and stable and clear color display can be performed, color compensation is sufficient, and as a result, both reflective and transmissive type characteristics can be satisfied. We were able to provide a high-performance semi-transmissive liquid crystal display device.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a liquid crystal display device of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the liquid crystal display device of the present invention.

FIG. 3 is an enlarged cross-sectional view of a main part of another liquid crystal display device of the present invention.

FIG. 4 is a schematic cross-sectional view of a conventional liquid crystal display device.

FIG. 5 is an explanatory diagram showing angular angles when the stretching axis of the retardation plate and the absorption axis of the polarizing plate are viewed from the display surface.

[Explanation of symbols]

1, 9, liquid crystal display device 2, 30 LCD panel 3,5 Phase plate 10 Light-scattering plate 11 First retardation plate 12 Second retardation plate 14 Third retardation plate 15 Fourth phase plate 4, 6, 13, 16 Polarizing plate 22 Semi-permeable membrane 7 Semi-transparent plate 8 backlight 17, 18 glass substrate 19, 26 Transparent electrode 19 'semi-transparent electrode 20, 25 Overcoat layer 21, 27 Alignment film 23 Color filter 24 black matrix 28 Liquid crystal layer 29 Sealant 30 spacers

Claims (2)

[Claims] 1. Two transparent members each having a transparent electrode and an alignment layer sequentially laminated on a transparent substrate and having a twist angle of 240 to 2.
A liquid crystal in which pixels are arranged in a matrix by laminating a super nematic liquid crystal having an optical path difference Δnd of 800 to 900 nm at 60 ° and a semitransparent film is arranged between a transparent substrate and a transparent electrode. On one main surface side of the panel,
A first retardation plate having an optical path difference Δnd of 680 to 700 nm,
A second retardation plate having an optical path difference Δnd of 570 to 590 nm,
The first polarizing plate is sequentially assembled and laminated, and the optical path difference Δ
nd is 130 to 150 nm, the third retardation plate, and the optical path difference Δ
A fourth retardation plate having an nd of 265 to 275 nm, a second polarizing plate, and a backlight are sequentially stacked, and when viewed from the display surface with reference to the average value of the rubbing directions on both surfaces of the super nematic liquid crystal, The stretching axis of the first retardation plate is 50 to 60 °, and the stretching axis of the second retardation plate is 16 °.
5 to 175 °, the absorption axis of the first polarizing plate to 5 to 15 °,
The stretching axis of the third retardation plate is set to 160 to 170 °, the stretching axis of the fourth retardation plate is set to 40 to 50 °, and the absorption axis of the second polarizing plate is set to 145 to 155 °. Liquid crystal display device. 2. Two transparent members each having a transparent electrode and an alignment layer laminated in this order on a transparent substrate and having a twist angle of 240 to 2
At a 60 ° angle, a liquid crystal panel, in which pixels are arranged in a matrix by adhering via a super nematic liquid crystal having an optical path difference Δnd of 800 to 900 nm, on one main surface side, the optical path difference Δnd is 680 to 700 nm. One retardation plate, a second retardation plate having an optical path difference Δnd of 570 to 590 nm, and a first polarizing plate are sequentially stacked, and on the other main surface side, a third retardation plate having an optical path difference Δnd of 130 to 150 nm. And sequentially stacking a fourth retardation plate having an optical path difference Δnd of 265 to 275 nm, a second polarizing plate and a backlight,
The electrode on the other main surface side is formed of a semi-transmissive film, and the stretching axis of the first retardation plate is 50 to 50 when viewed from the display surface based on the average value of the rubbing directions of both surfaces in the super nematic liquid crystal. The stretching axis of the second retardation plate is 165 to 175 °, and the absorption axis of the first polarizing plate is 5 to 15 °.
In addition, the stretching axis of the third retardation plate is set to 160 to 170 °, the stretching axis of the fourth retardation plate is set to 40 to 50 °, and the absorption axis of the second polarizing plate is set to 145 to 155 °. Liquid crystal display device.