JP2817740B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] The present invention relates to an STN-type liquid crystal display device that performs black-and-white display using a plastic film for color compensation, and has a simple structure by defining a plastic film, a polarizer, and an analyzer. In order to provide a liquid crystal display device with good display quality, the retardation of the liquid crystal layer is between the polarizer and the analyzer.
In a liquid crystal display device equipped with an STN type liquid crystal panel for display of 0.95 ± 0.1 μm and a plastic film for color compensation which has birefringence by stretching, a polarizer, liquid crystal panel, plastic When the film and the analyzer are laminated in this order, the retardation of the plastic film is set to 0.60 when the direction of dividing the rubbing direction unique to the two glass substrates of the liquid crystal panel into two is set to 0 °.
And the stretching direction is 42 ° ± 5 °, the absorption axis angle of the polarizer is 0 ° ± 5 °, and the absorption axis angle of the analyzer is 10 ° ± 5 °. When the polarizer, the plastic film, the liquid crystal panel, and the analyzer are laminated in this order in the propagation direction, the stretching direction of the plastic film in the above-described configuration is set to −42 ° ± 5 °.

[Industrial applications]

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of displaying a large number of black lines on a white background by using a plastic film for color compensation and suitable for colorization.

The conventional twisted nematic liquid crystal (TN liquid crystal), which twists (twists) the molecular axis of liquid crystal molecules by 90 ° along the cell layer, has a low contrast ratio and cannot display large-capacity data. The super-twisted nematic liquid crystal (STN liquid crystal) has been put to practical use, in which the liquid crystal cell has a sharp change in the optical characteristics with respect to the applied voltage by drastically increasing the temperature to within the range of 180 ° to 270 °. This STN type liquid crystal has a liquid crystal of 10 pixels by a display method using its birefringence effect.
A large-capacity color liquid crystal display device capable of displaying ⁴ to 10 ⁵ and realizing display of many lines in a simple matrix format using such an STN liquid crystal has been commercialized as a word processor, a liquid crystal television, or the like.

However, since the STN-type liquid crystal uses a color change effect due to an interference phenomenon using a birefringence effect for display, the display is inevitably colored in an on or off state.

By the way, as for the display color tone, in principle, white / black display is obtained by on / off modulating the light of all components in the visible light region, so that the contrast is good. Characters and figures have been commonly used. For this reason, there is a demand for black / white display from the market for the entire electronic display such as a CRT and a flat display. In particular, there is a strong demand from the field of OA equipment for business use which has a long usage time.

Further, white / black display of the STN type liquid crystal is an essential requirement for performing multi-color or full-color display. In other words, when performing color display using this STN type liquid crystal,
If the display color is not white / black, there is a problem that color unevenness occurs among the three primary colors of red R, green G, and blue B. Therefore, a white / white liquid crystal using STN type liquid crystal with large capacity and excellent display quality
There is a demand for a black display liquid crystal display device.

[Conventional technology]

To date, the following three schemes have been developed as a technical approach to white / black display of STN type liquid crystals.

(1) OMI type Based on a conventional STN type liquid crystal, a retardation value (Δn · d: d is a liquid crystal layer film, Δn is a birefringence value of the liquid crystal) of the liquid crystal layer is reduced to achieve an achromatic color. By decreasing the retardation value, the white state can be approached, but there is also a problem that the transmittance of the panel is reduced.

(2) Dye-added type A device based on the blue mode of STN-type liquid crystal, and displays black by correcting the color of the blue display state when off by adding a dichroic dye. Dissolution of the black dichroic dye in the liquid crystal inevitably decreases the transmittance in the white state (at the time of ON), and also causes a problem that the response speed is reduced.

(3) Two-layer type An optical STN-type liquid crystal panel without an electrode structure for eliminating display coloring is superimposed on a conventional STN-type liquid crystal as a compensator. Between a pair of electrodes arranged in a matrix
A drive panel having a nematic liquid crystal twisted by 180 ° to 270 ° is overlapped with a compensation panel having a nematic liquid crystal having a twist direction opposite to that of the liquid crystal of the drive panel and having the same twist angle, and a pair of polarized light is provided on both sides thereof. This is a configuration in which the absorption axes of the plates are arranged orthogonally, and is called a DSTN type liquid crystal.

Of these, the two-layer DSTN liquid crystal panel has good white /
In recent years, since black display is possible and there is no problem of reduction in transmittance,
It has begun to be used for large liquid crystal display devices for OA equipment.

[Problems to be solved by the invention]

However, the DSTN type liquid crystal display device configured as described above has good display characteristics such as contrast, but requires two STN type liquid crystal panels, so that the cost is high.
There are disadvantages such as a large weight.

Therefore, the present inventors have found that, as a result of experiments, a liquid crystal display device that can reduce the above-mentioned disadvantages by using a plastic film having birefringence by stretching instead of the compensation panel of the DSTN type liquid crystal panel. We found that we could provide.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display capable of white / black display, which can reduce the disadvantages of high cost and heavy weight.

[Means for solving the problem]

FIG. 1 shows the principle configuration of the liquid crystal display device of the present invention which achieves the above object. In the liquid crystal display device of the present invention, the retardation Δn · of the liquid crystal layer is provided between the polarizer 1 and the analyzer 2.
FIG. 1A shows a liquid crystal display device provided with an STN liquid crystal panel 3 for display having d of 0.95 ± 0.1 μm and a plastic film 4 for color compensation having birefringence by stretching. When the polarizer 1, the liquid crystal panel 3, the plastic film 4, and the analyzer 2 are laminated in this order in the light propagation direction, the rubbing direction inherent to the two glass substrates of the liquid crystal panel 3 is divided into two. Is 0 °, the retardation Δnd of the plastic film 4 is 0.60
± 0.05μm and the angle of the stretching direction is 42 ° ± 5
を, the absorption axis angle of the polarizer 1 is 0 ° ± 5 °,
The absorption axis angle of the analyzer 2 is set to 10 ° ± 5 °,
As shown in FIG. 1 (b), when the polarizer 1, the plastic film 4, the liquid crystal panel 3, and the analyzer 2 are laminated in this order in the light propagation direction, the angle in the stretching direction of the plastic film is- It is characterized by being configured as 42 ° C. ± 5 °.

[Action]

According to the present invention, the plastic film having birefringence functions as a compensating plate for coloring of the display of the STN liquid crystal, and white / black display with high contrast can be realized on the STN liquid crystal panel.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view showing the configuration of the liquid crystal display device of the present invention. 1 and 2 are polarization filters, 1 is called a polarizer (polarizer), and 2 is called an analyzer (analyzer). An STN liquid crystal panel (drive panel) 3 for display and a plastic film 4 for color compensation are provided between the polarizer 1 and the analyzer 2.
Are laminated. The display driving panel 3 is composed of a driving liquid crystal 33 sealed between two glass substrates 31 and 32, and inside the two glass substrates 31 and 32, respectively, are orthogonal to each other. Transparent electrodes such as ITO that are related,
An alignment film (both not shown) is provided inside.

In the liquid crystal display device configured as described above, in this embodiment, the rubbing direction of the upper glass substrate 31 of the drive panel 3 (indicated by a dashed line A) and the rubbing direction of the lower glass substrate 32 (the dashed line B) Is defined as 0 °. The retardation value Δn · d of the liquid crystal 33 of the drive panel 3 is set to 0.95 ± 0.1 μm.

In FIG. 1, the absorption axis angle θ _P of the polarizer 1 is set to 0 ° ± 5 ° as shown by an arrow C, and the absorption axis angle θ _A of the analyzer 2 is set to 10 ° ± 5 as shown by an arrow d.゜, and the retardation value Δnd of the plastic film 4 for compensation is
Defined as 0.60 ± 0.05 .mu.m, further define 42 ° ± 5 ° as shown the extending direction of the angle theta _f by an arrow e.

The reason why the absorption axis angle of the polarizer 1 and the analyzer 2 and the retardation value and the stretching direction of the plastic film are defined as described above is based on the experimental results of the present inventors. FIG. 7 to FIG.

FIG. 3 shows the dependence of chromaticity on the absorption axis angle of the analyzer using a chart showing the color evaluation method determined by the CIE (International Commission on Illumination). In the CIE chart, the upper left direction indicates green G, the lower right direction indicates red R, and the lower left direction indicates blue B. Then, X = 0.313, Y = 0.3
The 29th point D65 is a white reference point. At this point D65, the light state (V _ON ) turns white and the dark state (V _OFF ) turns black.

Now, under the condition that the absorption axis angle θ _P of the polarizer 1 is 0 ° and the angle θ _{f in} the stretching direction of the plastic film 4 is 45 °, the absorption axis angle θ _A of the analyzer 2 is changed from 0 ° to 20 °. As a result of experiment, in the bright state, it becomes almost white at all angles,
Data that the absorption axis angle theta _A is close to the most black near 10 ° was obtained in a dark state.

FIG. 4 shown below is the same CIE chart as FIG. 3,
This chart shows the angle dependence of the chromaticity in the stretching direction of the plastic film. Here, the absorption axis angle θ _P of the polarizer 1 is 0 °, and the absorption axis angle θ _A of the analyzer 2 is 10 °.
Under the condition of ゜, the stretching direction θ _f of the plastic film 4 is 35
The experiment was carried out by changing from ゜ to 55 ゜. Becomes close to white at all angles in the bright state from the figure, the data that the extending direction of the angle theta _f is close to the most black near 45 ° was obtained in a dark state.

FIG. 5 is the same CIE chart as FIG. 3, and shows the dependence of the chromaticity on the absorption axis angle of the polarizer. Here, the absorption axis angle θ _A of the analyzer 2 is fixed at 10 °, the angle θ _f in the stretching direction of the plastic film 4 is fixed at 45 °, and the absorption axis angle θ _P of the polarizer 1 is changed from −5 ° to 10 °. The experiment was performed. From this figure, data was obtained that in the bright state, the color became almost white at all angles, but in the dark state, the absorption axis angle θ _P of the polarizer 1 became the blackest when the angle was around −5 °.

FIG. 6 shows experimental data showing a change in contrast when the absorption axis angle θ _A of the analyzer 2 is changed. The absorption axis angle θ _P = 0 ° of the polarizer 1 and the angle θ in the stretching direction of the plastic film 4 are shown. Data obtained by setting _f to 45 °. From this data, it is seen how the absorption axis angle theta _A of the analyzer 2 is good contrast when the order of 10 ° to 15 °. That from the characteristic absorption axis angle theta _A of the analyzer 2 can be when about 10 ° concludes with excellent contrast.

FIG. 7 shows that the absorption axis angle θ _P of the polarizer 1 is 0 ° and the analyzer 2
The absorption axis angle theta _A fixed 10 ° of, shows changes in Kotorasuto in experiments with varying angle theta _f stretching direction of the plastic film 4. From this data,
Stretching direction at an angle theta _f of the plastic film 4 is 35 ° to
It can be seen that good contrast can be obtained in the range of 45 °.

FIG. 8 is 10 ° to the absorption axis angle theta _A of the analyzer 2, the extending direction of the angle theta _f of the plastic film 4 is fixed to 45 °,
FIG. 9 shows a change in contrast in an experiment in which the absorption axis angle θ _P of the polarizer 1 was changed. From this data, it can be seen that good contrast is obtained when the absorption axis angle θ _P of the polarizer 1 is around 0 °.

Further, FIG. 9 is experimental data showing a change in contrast when the retardation value Δn · d of the plastic film 4 is changed. From this data, the retardation value Δnd of the plastic film 4 is 500 nm (0.5 μm).
m), the contrast increases as the distance increases, but Δ
The contrast becomes maximum when n · d is around 580 nm, and thereafter, the retardation value Δn · d of the plastic film 4 is obtained.
It can be seen that the contrast decreases as the value increases.

Therefore, from the data shown in FIGS. 3 to 9 obtained by the experiment, an STN-type liquid crystal panel for display in which the retardation Δn · d of the liquid crystal layer is 0.95 ± 0.1 μm is provided between the polarizer 1 and the analyzer 2. 3 and a plastic film 4 for color compensation, which is made birefringent by stretching, are combined with a polarizer 1, a liquid crystal panel 3, a plastic film 4, and an analyzer 2 in the light propagation direction.
In the liquid crystal display device stacked in this order, the liquid crystal panel 3
When the direction in which the rubbing direction unique to the two glass substrates is divided into two is set to 0 °, the retardation Δn · d of the plastic film 4 is set to 0.60 ± 0.05 μm, and the angle θ _{f of the} stretching direction is set to 42 ° ± 5 °, the absorption axis angle θ _P of the polarizer 1 is 0 ° ± 5 °, and the absorption axis angle θ of the analyzer 2 is
_It can be seen that when _{A is set} to 10 ° ± 5 °, a liquid crystal display device with good contrast and a display closest to white / black can be obtained.

FIG. 10 is a perspective view showing a configuration of a modified example of the liquid crystal display device of FIG. 1, and includes a polarizer 1, an analyzer 2, and a driving panel 3.
The order of lamination of the plastic film 4 for color compensation is the same as that of the liquid crystal display device of FIG. The configuration of the drive panel 3 is the same as that of FIG. 1, and furthermore, the rubbing direction of the upper glass substrate 31 of the drive panel 3 (indicated by a dashed line A) and the rubbing direction of the lower glass substrate 32 (the dashed line) B)
Is defined as 0 °, and the retardation value Δn · d of the liquid crystal 33 is also 0.95 ± 0.1 μm.

The liquid crystal display device of this embodiment differs from the liquid crystal display device of FIG. 1, the absorption axis angle theta _A absorption polarizer 1 axis angle theta _P and the analyzer 2. That is, in this embodiment, the 10 90 ° ± an absorption axis angle theta _P of the polarizer 1 as illustrated in FIG arrow
5 defined °, only point set 100 ° ± 5 ° to the absorption axis angle theta _A of the analyzer 2 as shown by arrows and. FIGS. 11 to 14 show the experimental results that led to the definition of the configuration of the liquid crystal display device as described above.

FIG. 11 shows the dependence of the chromaticity on the absorption axis angle of the analyzer using a chart showing the color evaluation method determined by the CIE as in FIG. Here, the absorption axis angle θ of the polarizer 1
_P = 90 degrees, the angle θ in the stretching direction of the plastic film 4
As a result of an experiment in which the absorption axis angle θ _A of the analyzer 2 was changed from 90 ° to 110 ° under the condition of _f = 45 °, the angle became close to white at all angles in the bright state, but the absorption axis angle in the dark state. θ _A
The data showed that the color became closest to black at around 100 mm.

FIG. 12 shown below is the same CIE chart as FIG. 11,
This chart shows the dependence of the chromaticity on the angle in the stretching direction of the plastic film. Here, the stretching direction angle θ _f of the plastic film 4 is determined under the conditions that the absorption axis angle θ _P of the polarizer 1 is 90 ° and the absorption axis angle θ _A of the analyzer 2 is 100 °.
The experiment was carried out by changing from 35 ゜ to 55 ゜. Becomes close to white at all angles in the bright state from the figure, the data that the extending direction of the angle theta _f is close to the most black near 45 ° was obtained in a dark state.

FIG. 13 is experimental data showing a change in contrast when the absorption axis angle θ _A of the analyzer 2 is changed. The absorption axis angle θ _P = 90 ° of the polarizer 1 and the angle θ in the stretching direction of the plastic film 4 are shown. Data obtained by setting _f to 45 °. From this data, the absorption axis angle theta _A of the analyzer 2 is 100 ° to 105
It can be seen that the contrast is good at the time of ゜.

FIG. 14 shows that the absorption axis angle θ _P of the polarizer 1 is 90 ° and the analyzer 2
The absorption axis angle theta _A fixed 100 ° of shows the change in contrast in the experiment of varying the angle theta _f stretching direction of the plastic film 4. According to this data, the angle θ _{f in} the stretching direction of the plastic film 4 is 35
It can be seen that good contrast can be obtained in the range of ゜ to 45 °.

Therefore, based on the data shown in FIGS. 11 to 14 obtained by the experiment, the absorption axis angle θ _P of the polarizer 1 is set to 90 ° ± 5 ° in the embodiment of FIG. _A to 10
It can be seen that a liquid crystal display device with good contrast and a display closest to white / black can be obtained even when 0 ° ± 5 °.

FIG. 15 is a perspective view showing the configuration of another embodiment of the liquid crystal display device of the present invention. In this embodiment, the structures of the polarizer 1, the analyzer 2, the drive panel 3, and the plastic film 4 for color compensation are the same as those of the embodiment of FIG. 2, but the lamination order is different from that of FIG. That is, in the liquid crystal display device of FIG. 2, the polarizer 1, the drive panel 3, the plastic film 4, and the analyzer 2 are laminated in this order in the light propagation direction.
The liquid crystal display device shown in FIG. 15 is different in that a polarizer 1, a plastic film 4, a driving panel 3, and an analyzer 2 are laminated in this order in the light propagation direction.

The direction in which the rubbing direction of the upper glass substrate 31 of the drive panel 3 (indicated by a dashed-dotted line h) and the rubbing direction of the lower glass substrate 32 (indicated by a dashed-dotted line) are bisected is 0.
゜, the retardation value Δ of the liquid crystal 33 of the drive panel 3
The point where n · d is 0.95 ± 0.1 μm, the absorption axis angle θ _P of the polarizer 1 is defined as 0 ° ± 5 ° as shown by the arrow nu, and the absorption axis angle θ of the analyzer 2 is shown as the arrow ル. _A is set to 10 ° ± 5 °, and the retardation value Δnd of the plastic film 4 for compensation is set to 0.60 ± 0.05 μm in the same manner as in the liquid crystal display device of FIG. However, the angle theta _f stretching direction of the plastic film 4 in this embodiment is determined to be the -42 ° ± 5 ° as shown by the arrow o. Experimental results in which the absorption axis angle of the polarizer 1 and the analyzer 2 and the retardation value and the stretching direction angle of the plastic film are defined as described above are shown in FIGS. 16 to 19 below.

FIG. 16 shows the dependence of the chromaticity on the absorption axis angle of the analyzer using a chart showing the color evaluation method determined by the CIE as in FIG. Here, the absorption axis angle θ of the polarizer 1
_P = 0 °, angle θ in the stretching direction of the plastic film 4
As a result of an experiment in which the absorption axis angle θ _A of the analyzer 2 was changed from 0 ° to 20 ° under the condition of _f = −45 °, the absorption axis became close to white at all angles in the bright state, but the absorption axis in the dark state. Angle θ _A
The data showed that the color became closest to black at around 10 mm.

FIG. 17 shown below is also the same CIE chart as FIG. 3,
This chart shows the dependence of chromaticity on the stretching direction of the plastic film. Here the absorption axis angle theta _{P =} 0 ° of the polarizer 1, the theta _f the angle of the extending direction of the plastic film 4 at the absorption axis angle theta _{A =} 10 ° condition of the analyzer 2 -35
The experiment was performed by changing from ゜ to -55 ゜. Becomes close to white at all angles in the bright state from the figure, the data that the extending direction of the angle theta _f is close to the most black near -40 ° was obtained in a dark state.

FIG. 18 is experimental data showing a change in contrast when the absorption axis angle θ _A of the analyzer 2 is changed. The absorption axis angle θ _P = 0 ° of the polarizer 1 and the angle θ in the stretching direction of the plastic film 4 are shown. _This is data obtained by setting _f to -45 °.
From this data, the absorption axis angle theta _A is 10 ° to 15 of the analyzer 2
It can be seen that the contrast is good at the time of ゜.

FIG. 19 shows that the absorption axis angle θ _P of the polarizer 1 is 0 degree and the analyzer 2
The absorption axis angle theta _A fixed 10 ° of shows the change in contrast in the experiment of varying the angle theta _f stretching direction of the plastic film 4. According to this data, the angle θ _{f in} the stretching direction of the plastic film 4 is −
It can be seen that good contrast is obtained in the range of 35 ° to -45 °.

Therefore, according to the data shown in FIGS. 16 to 19 obtained by the experiment, in the liquid crystal display device in which the polarizer 1, the plastic film 4, the liquid crystal panel 3, and the analyzer 2 are stacked in the light propagation direction in this order, When the direction of dividing the rubbing direction inherent to the two glass substrates into two is 0 °,
Set the retardation Δn · d of the plastic film 4 to 0.
60 ± 0.05 μm, and the angle θ _{f in the} stretching direction is −
42 ° ± 5 °, and the absorption axis angle θ _P of the polarizer 1 is set to 0 ° ± 5 °.
And °, the absorption axis angle theta _A of the analyzer 2 when 10 ° ± 5 °, good contrast, yet displayed it can be seen that the closest the liquid crystal display device in a white / black is obtained.

FIG. 20 is a perspective view showing a configuration of a modified embodiment of the liquid crystal display device of FIG. 15. In the liquid crystal display device of FIG. 15, the absorption axis angle θ _P of the polarizer 1 and the absorption axis angle of the analyzer 2 are shown. θ _A
Is changed. In this embodiment, the absorption axis angle θ _P of the polarizer 1 is determined to be 90 ° ± 5 ° as shown by an arrow in FIG. 20, and the absorption axis angle θ _{A of the} analyzer 2 is shown by an arrow f.
Is defined as 100 ゜ ± 5 ゜.

In the liquid crystal display device of FIG. 2, the absorption axis angle θ _P of the polarizer 1 is changed from 0 ° ± 5 ° to 90 ° ± 5 °, and the absorption axis angle θ _A of the analyzer 2 is changed from 10 ° ± 5 ° to 100 °. As the liquid crystal display device of FIG. 10 changed to {± 5} showed good contrast, the absorption axis angle θ of the polarizer 1 in the embodiment of FIG.
_P was changed 90 ° ± 5 ° from the 0 ° ± 5 °, Figure 20 a liquid crystal display device also contrast was changed 100 ° ± 5 ° from the absorption axis angle theta _A of the analyzer 2 10 ° ± 5 ° Thus, a liquid crystal display device with good display and the display closest to white / black can be obtained.

〔The invention's effect〕

As described above, according to the present invention, a liquid crystal display device is provided with a polarizer and a liquid crystal layer having a liquid crystal layer having a retardation value of 0.95 ± 0.1 μm.
It consists of a TN type liquid crystal panel, a plastic film with a retardation value of 0.60 ± 0.05μm, and an analyzer. These are arranged in the direction of light propagation in the order of polarizer, liquid crystal panel, plastic film, analyzer, or polarizer, plastic film, liquid crystal. Panels and analyzers are stacked in this order, and the polarizer absorption axis angle, the plastic film stretching direction angle, and the analyzer absorption axis angle are specified, respectively. A display device is obtained.
Therefore, in the device of the present invention, by using a plastic film having birefringence by stretching instead of the compensation panel, while maintaining display characteristics such as good contrast, the cost is high, and the weight is large. There is an effect that it is possible to provide a liquid crystal display device with no disadvantage.

[Brief description of the drawings]

1 (a) and 1 (b) are views for explaining the principle of the present invention, FIG. 2 is an exploded perspective view showing the structure of a liquid crystal display device according to one embodiment of the present invention, and FIGS. FIG. 3 shows experimental data obtained by using the apparatus shown in FIG. 2, FIG. 3 is an ICE chart showing the dependence of chromaticity on the absorption axis of the analyzer, and FIG. 4 is a dependence of chromaticity on the stretching direction angle of the plastic film. FIG. 5 is an IC showing the dependence of the chromaticity on the absorption axis angle of the polarizer.
E chart, FIG. 6 is a characteristic diagram showing the relationship between the absorption axis angle of the analyzer and the contrast, FIG. 7 is a characteristic diagram showing the relationship between the stretching direction angle of the plastic film and the contrast, and FIG. 8 is a polarizer. FIG. 9 is a characteristic diagram showing the relationship between the absorption axis angle and the contrast of FIG. 9, FIG. 9 is a characteristic diagram showing the relationship between the retardation of the plastic film and the contrast, and FIG.
11 is an exploded perspective view showing the configuration of a modified embodiment of the liquid crystal display device shown in FIG. 2, and FIGS. 11 to 14 show experimental data using the device shown in FIG. 10, and FIG. FIG. 12 is an ICE chart showing the dependence of chromaticity on the absorption axis of the analyzer, FIG. 12 is an ICE chart showing the dependence of chromaticity on the stretching direction of the plastic film, and FIG. 13 is an absorption axis angle and contrast of the analyzer. FIG. 14 is a characteristic diagram showing the relationship between the stretching direction angle and the contrast of the plastic film,
FIG. 15 is an exploded perspective view showing the configuration of another embodiment of the liquid crystal display device of the present invention, FIGS. 16 to 19 show experimental data using the device of FIG. 15, and FIG. FIG. 17 is an ICE chart showing the dependence of chromaticity on the absorption axis of the analyzer, FIG. 17 is an ICE chart showing the dependence of chromaticity on the stretching direction of the plastic film, and FIG. 18 is an absorption axis angle and contrast of the analyzer. 19 is a characteristic diagram showing the relationship between the stretching direction angle of the plastic film and the contrast, FIG.
FIG. 20 is an exploded perspective view showing a configuration of a modified example of the liquid crystal display device shown in FIG. 1 ... Analyzer, 2 ... Polarizer, 3 ... Drive panel, 4 ...
… Plastic film, 31, 32 …… Glass substrate, 33…
... Liquid crystal, θ _A ... Absorption axis angle of analyzer, θ _f ... Angle of stretching direction of plastic film, θ _p ... Absorption axis angle of polarizer.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Go Kamata 1015 Ueodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-64-519 (JP, A) JP-A-64-23224 (JP, A) JP-A-1-173012 (JP, A) JP-A-2-4230 (JP, A) JP-A-2-45518 (JP, U) JP-A-2-45519 (JP, U) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/1335 510

Claims (4)

(57) [Claims] 1. An STN type liquid crystal panel for display having a retardation of a liquid crystal layer of 0.95 ± 0.1 μm between a polarizer (1) and an analyzer (2), and having birefringence by stretching. In a liquid crystal display device provided with a plastic film (4) for color compensation, a polarizer (1), a liquid crystal panel (3), a plastic film (4), and an analyzer (2) are arranged in the light propagation direction. When the rubbing directions inherent to the two glass substrates of the liquid crystal panel (3) are divided into two in this order, and the direction in which the two rubbing directions are divided into two is 0 °,
Set the retardation of the plastic film (4) to 0.
60 ± 0.05 μm, the stretching direction is 42 ° ± 5 °, the absorption axis angle of the polarizer (1) is 0 ° ± 5 °,
A liquid crystal display device wherein the analyzer (2) has an absorption axis angle of 10 ° ± 5 °. 2. The liquid crystal display device according to claim 1, wherein the polarizer (1) has an absorption axis angle of 90 ° ± 5 ° and the analyzer (2) has an absorption axis angle of 10 ° ± 5 °. Liquid crystal display device characterized by the above-mentioned. 3. An STN type liquid crystal panel for display having a retardation of a liquid crystal layer of 0.95 ± 0.1 μm between a polarizer (1) and an analyzer (2), and having birefringence by stretching. In a liquid crystal display device provided with a plastic film (4) for color compensation, a polarizer (1), a plastic film (4), a liquid crystal panel (3), and an analyzer (2) are arranged in the light propagation direction. The plastic film (4) is laminated in this order, and the retardation of the plastic film (4) is set to 0.60 ± 0.05 μm when the direction of dividing the rubbing direction inherent to the two glass substrates of the liquid crystal panel (3) into two is set to 0 °. -42 ゜ ±
A liquid crystal display device, wherein the angle is 5 °, the absorption axis angle of the polarizer (1) is 0 ° ± 5 °, and the absorption axis angle of the analyzer (2) is 10 ° ± 5 °. 4. The liquid crystal display device according to claim 3, wherein the polarizer (1) has an absorption axis angle of 90 ° ± 5 ° and the analyzer (2) has an absorption axis angle of 10 ° ± 5 °. Liquid crystal display device characterized by the above-mentioned.