JPH10133815A - Liquid crystal display element with inputting function and electronic appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display element with inputting function capable of obtaining sufficient contrast even if an inputting function is added thereto by devising the structure or arrangement of each member of an inputting device and the display element. SOLUTION: In the liquid crystal display element with inputting function having a liquid crystal cell 5 and an inputting device 1 between a pair of polarizing plates, as defining that the retardation value of one of the substrates (2a, 2b) of the input device 1 is R and an angle formed by the optical axis of one of the substrates and the polarization axis of the polarizing plate 11 adjacent to the input device 1 is δ, the retardation value R has the relation of the following formula. R(nm)<=25/sin(2*δ)*sin(2*δ).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having an input function, and further relates to an O.D.
The present invention relates to electronic devices such as A devices, measuring devices, and portable devices.

[0002]

2. Description of the Related Art An optically anisotropic polymer film for color compensation is provided between a polarizing plate and a liquid crystal cell of a super twisted nematic (STN) type liquid crystal display device as a liquid crystal display device capable of monochrome display with a large capacity in a simple matrix. There is a liquid crystal display device provided with the same (hereinafter referred to as an FTN type liquid crystal display device). The structure of such an FTN-type liquid crystal display device is described in Japanese Patent Publication No. 3-50249, column 6, line 41 to column 7, line 5, and FIG.
It is described in. In recent years, many small portable information terminal devices have been demanded to have low power consumption, so that liquid crystal display elements are often used. In particular, for those requiring monochrome display, FTN type liquid crystal display elements are used. ing.
Further, in order to reduce the size of the device, liquid crystal display devices having an input function having an input device arranged above the liquid crystal display device are increasing.

FIG. 4 shows a configuration of a conventional liquid crystal display device with an input device using an FTN type liquid crystal display device. An upper electrode substrate 406a on which an upper electrode 407a is formed and a lower electrode substrate 406b on which a lower electrode 407b is formed face the liquid crystal cell 405 via a spacer 408.
09 is filled. The input device 401 is the upper electrode 40
Upper electrode substrate 402a on which lower electrode 4a is formed and lower electrode 40
The lower electrode substrate 402b on which the 3b is formed is a spacer 4
The upper and lower electrodes are opposed to each other via the electrode 04 so that they do not normally come into contact with each other. On the upper side of the upper electrode substrate 406a of the liquid crystal cell 405, there is provided an optically anisotropic polymer film 410 (hereinafter referred to as a retardation plate).
There is. Also, the lower electrode substrate 406b of the liquid crystal cell 405
A lower polarizing plate 412 and a reflecting plate 413 are provided below the lower electrode substrate 402 b of the input device 401 and an upper polarizing plate 41.
1 is kept at such an interval that Newton rings do not occur.

[0004]

However, such a conventional liquid crystal display device having an input function has a large reflection on the surface of the liquid crystal display device and a large reflection on the inner surface of the input device, so that the display becomes difficult to see, and the input function is difficult. There is a problem that the contrast is remarkably reduced as compared with a liquid crystal display element not provided. Therefore, the present invention solves such a conventional problem,
An object of the present invention is to provide a liquid crystal display device with an input function that can obtain a sufficient contrast even if an input function is added by devising the configuration and arrangement of each member of an input device and a display element. Another object of the present invention is to provide an electronic device which has solved the problem that the contrast is reduced by mounting a liquid crystal display device with an input function.

[0005]

According to a first aspect of the present invention, there is provided a liquid crystal display device having an input function, wherein a nematic liquid crystal is twisted in a range of 180 degrees to 360 degrees between a pair of substrates having display electrodes on opposed inner surfaces. A liquid crystal cell sandwiching the
An input device including at least one layer of an optically anisotropic polymer film, a pair of substrates having input electrodes on opposing inner surfaces, and a liquid crystal display device with an input function including a pair of polarizing plates. The liquid crystal cell, the optically anisotropic polymer film and the input device are arranged between the polarizing plates, and the optically anisotropic polymer film is arranged adjacent to the liquid crystal cell, When the angle between the polarization axis of the one polarizing plate adjacent to the input device and the optical axis direction of one substrate of the input device is δ, and the value of the retardation of one substrate of the input device is R , R

[0006]

(Equation 3)

It is characterized by the following relationship.

According to the above configuration, there is an effect that a deterioration in display quality due to the influence of retardation of the input electrode substrate, which is an optically anisotropic body, can be prevented.

A liquid crystal display device with an input function according to a second aspect of the present invention is characterized in that the optically anisotropic polymer film is disposed between the liquid crystal cell and the input device.

According to the above arrangement, there is an effect that a liquid crystal element for black and white display can be obtained by the optically anisotropic polymer film.

According to a third aspect of the present invention, in the liquid crystal display device with an input function, the optically anisotropic polymer film is provided between the liquid crystal cell and the polarizing plate adjacent to the liquid crystal cell. Features.

According to the above arrangement, there is an effect that a black-and-white display liquid crystal element can be obtained by the optically anisotropic polymer film.

The liquid crystal display device with an input function according to the fourth aspect includes a substrate of the input device and the one polarizing plate adhered to each other through an adhesive layer. The liquid crystal cell and one of the pair of polarizing plates are adhered via an adhesive layer, and furthermore, the direction of the optical axis of the substrate of the input device and the polarizing axis of the polarizing plate adjacent to the input device. Δ from the direction of the input device, and R is the retardation value of the substrate of the input device.

[0014]

(Equation 4)

It is characterized by the following.

According to the above configuration, there is an effect that the reflected light on the surface of each layer is reduced, the influence of the retardation of the input electrode substrate, which is an optically anisotropic substance, is reduced, and the deterioration of display quality is prevented. .

According to a fifth aspect of the invention, there is provided a liquid crystal display device having an input function, wherein a surface of one of the pair of polarizing plates is subjected to a non-glare treatment or an anti-reflection treatment.

According to the above configuration, there is an effect that the reflection of light on the surface of the polarizing plate is controlled to prevent a deterioration in display quality due to the reflected light.

According to a sixth aspect of the present invention, in the liquid crystal display device with an input function, the optically anisotropic polymer film is a uniaxially stretched film.

According to the above configuration, there is an effect that a liquid crystal element for displaying black and white can be obtained.

According to a seventh aspect of the present invention, the optically anisotropic polymer film is made of polycarbonate, polysulfone, polyethersulfone, polyvinyl alcohol or polyarylate.

According to the above configuration, there is an effect that a black-and-white liquid crystal element which is uniform and has no display unevenness can be obtained.

The liquid crystal display device with an input function according to the present invention is characterized in that the optically anisotropic polymer film is a liquid crystal polymer film having a twisted orientation.

According to the above arrangement, there is an effect that a black-and-white display liquid crystal element having good contrast can be obtained.

According to the ninth aspect of the present invention, there is provided the electronic apparatus according to the first to eighth aspects.
A liquid crystal display device with an input function according to any one of the preceding claims is mounted as a display device.

According to the above configuration, there is an effect that a sufficient contrast can be obtained even with an input function.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows one configuration of an embodiment of the liquid crystal display device of the present invention. The liquid crystal cell 5 has an upper electrode 7
a on which an upper electrode substrate (referred to as a substrate) 6a and a lower electrode substrate 7b (referred to as a substrate) 6b
Are opposed to each other via a spacer 8 and the liquid crystal 9 is filled. The input device 1 includes an upper electrode substrate (a substrate of an input device, or simply a substrate) 2a on which an upper electrode 3a is formed and a lower electrode substrate (a substrate or a substrate of an input device) 2b on which a lower electrode 3b is formed. Normally, the upper and lower electrodes are opposed to each other via the spacer 4 so as not to contact with each other.

An upper polarizing plate 11 is adhered to the upper side of the upper electrode substrate 2a of the input device 1 via an adhesive layer. Above the upper electrode substrate 6a of the liquid crystal cell 5, a retardation plate 10 is adhered via an adhesive layer. Further, a lower polarizing plate 12 with a reflecting plate is adhered below the lower electrode substrate 6b of the liquid crystal cell 5 via an adhesive layer. The phase difference plate 10 attached to the lower electrode substrate 2b of the input device 1 and the upper electrode substrate 6a of the liquid crystal cell is maintained at such an interval that Newton rings do not occur.

FIG. 2 shows the direction of each axis such as the alignment direction of liquid crystal molecules, the direction of the slow axis of the retardation plate, and the direction of the polarization axis of the polarizing plate in the liquid crystal display device of the present invention.

Α is the angle between the direction 210 of the slow axis of the retardation plate and the orientation direction 206b of the liquid crystal molecules in contact with the inner surface of the lower electrode substrate 6b of the liquid crystal cell, and β is the polarization axis direction 211 of the upper polarizing plate 11. Is the angle between the liquid crystal cell and the orientation direction 206b of the liquid crystal molecules in contact with the inner surface of the lower electrode substrate 6b of the liquid crystal cell, and γ is the liquid crystal in contact with the polarization axis direction 212 of the lower polarizer 12 and the inner surface of the lower electrode substrate 6b of the liquid crystal cell. Δ1 is the angle between the optical axis direction 202a of the upper electrode substrate 2a of the input device and the polarization axis direction 211 of the upper polarizer 11, and δ2 is the lower side of the input device. Electrode substrate 2b
Of the optical axis 202b and the polarization axis direction 2 of the upper polarizing plate 11
11, the angle θ between the liquid crystal molecules in contact with the inner surface of the upper electrode substrate 6a of the liquid crystal cell and the orientation direction 206b of the liquid crystal molecules in contact with the inner surface of the lower electrode substrate 6b of the liquid crystal cell. The twist angle of the liquid crystal that is twisted. The directions of α, β, γ, and θ are positive in the direction shown in FIG. 2 (counterclockwise direction).

The material used for the substrate of the input device has some retardation other than glass. Although it is possible to reduce this retardation, the cost increases as it approaches zero. Also, there are variations in the size of the retardation and the direction of the optical axis. Therefore, even if there is some retardation, the cost can be reduced if it can be used by adjusting the size and the direction of the optical axis. The following is an example.

Embodiment 1 In FIG. 1, the upper polarizing plate 11
Is an NPF-G1225DU manufactured by Nitto Denko, and the upper electrode substrate 2a of the input device 1 is 100 μm thick and has a retardation of 3.
0 nm uniaxially stretched polyethersulfone film,
The lower electrode substrate of the input device 1 was made of glass having a thickness of 0.7 mm. This upper polarizing plate was adhered to the upper substrate of the input device via an adhesive layer.

The retardation plate 10 was a uniaxially stretched polycarbonate film having a thickness of 120 μm and a retardation of 600 nm, and was adhered to the upper electrode substrate 6a of the liquid crystal cell via an adhesive layer. 0.7 mm thick glass was used for the upper and lower electrode substrates 6a and 6b of the liquid crystal cell. NPF-F3225M manufactured by Nitto Denko was used as the lower polarizing plate 12 and the reflecting plate 13, and this was also adhered to the lower electrode substrate of the liquid crystal cell via an adhesive layer. In addition, a silicone rubber having a width of 3 mm and a height of 0.5 mm was set to an appropriate length between the input device 1 and the liquid crystal cell 5 and placed as a spacer.

In FIG. 2, α is 20 degrees, β is 170 degrees,
γ was 50 degrees and θ was 240 degrees. Further, a nematic liquid crystal having a refractive index anisotropy Δn of 0.132 is filled in a liquid crystal cell having a liquid crystal layer thickness d of 6.3 μm, and a product Δn of the liquid crystal refractive index anisotropy Δn and the liquid crystal layer thickness d is filled. D was set to 0.83 μm; Further, an appropriate amount of an optically active agent was added so that the twist angle of the liquid crystal molecules was stabilized at 240 degrees, thereby obtaining a liquid crystal display device having a black-and-white display input function which became bright when no voltage was applied and became dark when voltage was applied. At this time, when δ1 in FIG. 2 is set in the range of 0 ° to 30 ° or in the range of 60 ° to 90 °, it is slightly colored in pale green or pale yellow when no voltage is applied, and the appearance and contrast are better than before. . Further, δ1 in FIG. 2 is set in a range from 0 to 15 degrees or 7
When the angle is in the range from 5 degrees to 90 degrees, the appearance is further improved without faint coloring when no voltage is applied. On the other hand, when δ1 is in the range of 30 ° to 60 °, coloring when no voltage is applied becomes strong, the contrast becomes poor, and the appearance is not good.

As a comparative example, a conventional liquid crystal display device with an input function shown in FIG. 4 was used. In FIG. 4, the upper polarizer 4
11 is NPF-G1225DU manufactured by Nitto Denko, input device 4
01 is a polyethylene terephthalate film having a thickness of 120 μm and a retardation of 1 μm or more, and the lower electrode substrate of the input device 401 has a thickness of 0.7 μm.
mm glass was used. The phase difference plate 410 has a thickness of 120 μ
m, a uniaxially stretched polycarbonate film having a retardation of 600 nm is used.
For 06a and 406b, glass having a thickness of 0.7 mm was used.

As the lower polarizing plate 412 and the reflecting plate 413, NPF-F3205M manufactured by Nitto Denko was used. In addition, a width of 3 mm and a height of 0.5 m is provided between the input device 401 and the liquid crystal cell 405.
m silicone rubber was made to an appropriate length and placed as a spacer.

The orientation direction of the liquid crystal molecules, the direction of the slow axis of the retardation plate, and the direction of the polarization axis of the polarizing plate in the conventional liquid crystal display device with an input device shown in FIG. 4 can be represented by the definitions in FIG.
In FIG. 2, α is 20 degrees, β is 170 degrees, γ is 50 degrees,
θ was 240 degrees. Further, the refractive index anisotropy Δn is 0.1
A liquid crystal layer having a thickness d of 6.3 μm
m, and the product Δn · d of the refractive index anisotropy Δn of the liquid crystal and the thickness d of the liquid crystal layer was set to 0.83 μm. At this time, an appropriate amount of an optically active agent was added so that the twist angle of the liquid crystal molecules was stabilized at 240 degrees. As a result, this was also a liquid crystal display device with an input function that became bright when no voltage was applied and darkened when a voltage was applied.

In this embodiment and the comparative example, the brightness in the ON state (dark) and the brightness in the OFF state (bright) and the contrast (brightness in the OFF state / brightness in the ON state) when time-division driving with a duty ratio of 1/240 is performed. Is shown in Table 1.

[0039]

[Table 1]

As can be seen from the comparison between the first embodiment and the comparative example, the present embodiment has a slightly lower brightness in the OFF state than the comparative example, but has a better contrast. The conventional liquid crystal display device with an input function device used in the comparative example is light reflected on the surface of the liquid crystal cell or the inner surface of the input device (reducing the display quality).
Is strong. Since this reflected light overlaps both the OFF state and the ON state of the liquid crystal display element, the brightness in the OFF state is correspondingly bright but the contrast is reduced. On the other hand, in this embodiment, since the polarizing plate is provided on the upper side of the input device, the reflected light on the surface of the liquid crystal cell and the inner surface of the input device is smaller than that of the conventional device. Therefore, the contrast of this embodiment is clearly better than that of the comparative example. The brightness in the off state is smaller than that of the comparative example, because the reflected light on the surface of the liquid crystal cell and the inner surface of the input device is smaller than that of the comparative example. Therefore, the appearance of this embodiment is much better because unnecessary reflected light is eliminated.

By providing a plurality of retardation plates, coloring of the liquid crystal cell can be further eliminated. When a plurality of retardation plates are arranged, they may be arranged only on one substrate side of the liquid crystal cell, or may be arranged on both sides of the liquid crystal cell.

Embodiment 2 The upper electrode substrate 2a of the input device 1 of Embodiment 1 has a thickness of 100 μm and a retardation of 5 μm.
A 0 nm film of polyethersulfone was used.
At this time, when δ1 in FIG. 2 is set in the range of 0 ° to 20 ° or in the range of 70 ° to 90 °, it is slightly colored green or pale yellow when no voltage is applied, and the appearance and contrast are better than before. . Further, when δ1 in FIG. 2 is set in the range of 0 ° to 10 ° or in the range of 80 ° to 90 °, there is no faint coloring when no voltage is applied, and the appearance is further improved. On the other hand, when δ1 is in the range of 20 degrees to 70 degrees, coloring when no voltage is applied becomes strong, the contrast becomes poor, and the appearance is not good.

Embodiment 3 Instead of polyether sulfone, a polycarbonate film having a thickness of 120 μm and a retardation of 80 nm was used for the upper electrode substrate 2a of the input device 1 of the embodiment 1. At this time, when δ1 in FIG. 2 is set in the range of 0 ° to 15 ° or in the range of 75 ° to 90 °, it is slightly colored in pale green or pale yellow when no voltage is applied, and the appearance and contrast are better than before. . On the other hand, when δ1 is in the range of 15 degrees to 75 degrees, the coloring when no voltage is applied becomes strong, the contrast becomes poor, and the appearance is not good.

[Embodiment 4] FIG. 3 shows another configuration of the embodiment of the present invention. The liquid crystal cell 305 has an upper electrode 30
Upper electrode substrate 306a on which lower electrode 7a is formed and lower electrode 30
The lower electrode substrate 306b on which 7b is formed is the spacer 3
08 and the liquid crystal 309 is filled. In the input device 301, an upper electrode substrate 302a on which an upper electrode 303a is formed and a lower electrode substrate 302b on which a lower electrode 303b is formed face each other via a spacer 304 so that the upper and lower electrodes do not normally come into contact with each other. Input device 301
An upper polarizing plate 311 is attached to the upper side of the upper electrode substrate 302a via an adhesive layer. On the upper side of the upper electrode substrate 306a of the liquid crystal cell 305, an optically anisotropic polymer film 310 (hereinafter referred to as a retardation plate) is adhered via an adhesive layer. Also, the lower electrode substrate 3 of the liquid crystal cell 305
A lower polarizing plate 312 with a reflection plate is attached to the lower side of 06b via an adhesive layer. The phase difference plate 310 attached to the lower electrode substrate 302b of the input device 301 and the upper electrode substrate 306a of the liquid crystal cell is maintained at such an interval that Newton rings do not occur.

In FIG. 3, the upper polarizing plate 311 is NPF-G1225DU manufactured by Nitto Denko, and the upper electrode substrate 302a of the input device 301 is 100 μm thick and has a retardation of 5 μm.
0nm polyethersulfone film, input device 3
The lower electrode substrate 01 was made of glass having a thickness of 0.7 mm. The retardation plate 310 was a uniaxially stretched polycarbonate film having a thickness of 120 μm and a retardation of 600 nm. Glass having a thickness of 0.7 mm was used for the upper and lower electrode substrates 306a and 306b of the liquid crystal cell.

As the lower polarizing plate 312 and the reflecting plate 313, NPF-F3225M manufactured by Nitto Denko was used. Further, the liquid crystal cell, the retardation plate, and the lower polarizing plate were adhered via an adhesive layer. In addition, a width of 3 between the input device 301 and the liquid crystal cell 305.
Silicon rubber having a height of 0.5 mm and a suitable length was placed as a spacer.

In FIG. 2, α is 100 degrees and β is 7
0 degrees, γ was 130 degrees, and θ was 240 degrees. Further, a nematic liquid crystal having a refractive index anisotropy Δn of 0.132 is filled in a liquid crystal cell having a liquid crystal layer thickness d of 6.3 μm, and a product Δn of the liquid crystal refractive index anisotropy Δn and the liquid crystal layer thickness d is filled.・ D is 0.8
It was 3 μm. At this time, an appropriate amount of an optically active agent was added so that the twist angle of the liquid crystal molecules was stabilized at 240 degrees.

At this time, when δ1 in FIG. 2 is set in the range of 0 ° to 20 ° or in the range of 70 ° to 90 °, light green or pale yellow is slightly colored when no voltage is applied. Better than before. Further, when δ1 in FIG. 2 is set in the range of 0 ° to 10 ° or in the range of 80 ° to 90 °, there is no faint coloring when no voltage is applied, and the appearance is further improved. On the other hand, δ1 is 20
When the angle is in the range of degrees to 70 degrees, the coloring when no voltage is applied becomes strong, the contrast becomes poor, and the appearance is not good.

In a reflection type display element, if an air layer is present in the structure, the light reflected on the surface in contact with the air layer becomes large and may be at a level that cannot be ignored. In the case of using the FTN type liquid crystal display element as in the present invention, depending on the position of the phase difference plate and the position of the air layer, in addition to the light passing through the phase difference plate and the liquid crystal layer, only the phase difference plate or only the liquid crystal layer Light passing through is generated. Since both the liquid crystal layer and the retarder are optically anisotropic, in the structure of the present invention in which the polarizing plate is on the outside, light passing through only the retarder or the liquid crystal layer is different from the original display color. Each has a unique coloring.

When the retardation plate is above the liquid crystal cell, between the input device and the liquid crystal cell, between the upper polarizer and the input device, or inside the input device, etc., and there is an air layer between the liquid crystal cell. think about. In this case, the original display color due to the light passing through the phase difference plate and the liquid crystal layer is added to the original display color, and the colored light passing only through the phase difference plate without passing through the liquid crystal layer due to reflection at the surface in contact with the air layer is added. The display color is not black and white and the display is not good. When the retardation plate is between the liquid crystal cell and the lower polarizing plate and there is an air layer between the liquid crystal cell and the retardation plate, the display color by light passing through the retardation plate and the liquid crystal layer comes into contact with the air layer. Colored light that is reflected on the surface and passes only through the liquid crystal layer without passing through the phase difference plate is added, and the display color is not the original black and white display color, and the display is not good. In order to prevent such unnecessary coloring due to surface reflection, it is necessary not to place an air layer between the liquid crystal layer and the retardation plate, but to place the liquid crystal layer and the retardation plate on the same side with respect to the air layer. .

Fifth Embodiment A polyethersulfone film having a thickness of 100 μm and a retardation of 20 nm was used for the upper electrode substrate 302 a of the input device 301 of the third embodiment. The lower electrode substrate of the input device 301 has a thickness of 1.0 m.
A plate of polymethyl methacrylate having a retardation of 50 nm was used. At this time, δ1 in FIG.
Range to 0 degrees or range from 70 degrees to 90 degrees,
δ2 ranges from 0 to 15 degrees or 75 to 9
In the range up to 0 °, the appearance and contrast were improved to the extent that the color was slightly colored to pale green or pale yellow when no voltage was applied. On the other hand, δ1 is changed from 20 degrees to 70
In the case where δ2 is in the range of 15 ° to 75 °, coloring when no voltage is applied becomes strong, the contrast becomes poor, and the appearance is not good. . The same effect was obtained by using a norbornene-based resin in addition to polymethyl methacrylate for the lower electrode substrate of the input device 301.

Example 6 Instead of a uniaxially stretched polycarbonate film, a twist-oriented acrylic liquid crystalline polymer film was used for the retardation plate 10 of Example 1. The product Δn · d of the refractive index anisotropy Δn of the liquid crystalline polymer and the thickness d of the liquid crystalline polymer layer was set to 0.72 μm. Furthermore, the twist angle of the liquid crystalline polymer was set to 150 degrees, and the twist direction was set to the opposite direction to the liquid crystal of the liquid crystal cell. At this time, in FIG.
Is set to 60 degrees, β is set to 75 degrees, γ is set to 45 degrees, and θ is set to 220 degrees. As a result, a liquid crystal display device with an input function which became bright when no voltage was applied and darkened when a voltage was applied was also obtained. As a result, in the case of this embodiment, the contrast ratio was better and the appearance was better than in the prior art, similarly to the above-described embodiment.

Embodiment 7 NPF-G1225DUAG30 manufactured by Nitto Denko, whose surface is non-glare treated on the upper polarizers 11 and 311 in Embodiments 1 to 6, was used. As a result, an image was easily displayed without reflection of an image due to regular reflection on the polarizing plate surface. Further, the reflection of an image could be reduced by applying an anti-reflection treatment to the surface of the upper polarizing plate or attaching a film subjected to the anti-reflection treatment.

Example 8 In Examples 1 to 5, NPF-F4205P3 manufactured by Nitto Denko, which is a polarizing plate with a transflective reflector, was used for the lower polarizing plate and the reflecting plate. Further, a backlight was provided below the reflection plates 13 and 313.
As a result, by turning on the backlight, it can be used even in a dark environment.

[Embodiment 9] When the liquid crystal display elements of Embodiments 1 to 6 were mounted as a display element of an electronic organizer or a portable telephone, a high contrast ratio was obtained and a black-and-white display which was easy to see was obtained. Further, since the contrast ratio was high, the display capacity could be made larger than before. As a result, more information can be displayed, and a portable electronic device that is easier to use than before has been made possible.

In the present invention, the same effect can be obtained by using polysulfone, polyvinyl alcohol, polyarylate, polystyrene, or the like in addition to polycarbonate and polysulfone as the upper and lower electrode substrates of the input device.

[0057]

As described above, according to the liquid crystal display element of the present invention, the input device including the pair of input electrode substrates and the polarizing plates are disposed on both sides of the liquid crystal cell so that the liquid crystal cell and the liquid crystal cell are optically connected. A liquid crystal display device with an input function that has excellent black-and-white display with excellent contrast and easy-to-see because the structure is such that no air layer is interposed between the anisotropic polymer films and the direction of the optical axis of the input device substrate and the magnitude of the retardation are adjusted. Is obtained. Further, since the electronic apparatus of the present invention is equipped with a liquid crystal display element with an input function in which the configuration and arrangement of the input device and the display element are devised, sufficient contrast can be ensured.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a liquid crystal display device with an input function according to an embodiment of the present invention.

FIG. 2 is a diagram showing a direction of liquid crystal molecules, a direction of a polarization axis of a polarizing plate, and the like of a liquid crystal display device with an input function according to an embodiment of the present invention.

FIG. 3 is a structural view of a liquid crystal display device with an input function according to an embodiment of the present invention.

FIG. 4 is a structural view of a conventional liquid crystal display device with an input function.

[Brief description of reference numerals]

1. Input device 2a. Upper electrode substrate 2b. Lower electrode substrate 3a. Upper electrode 3b. Lower electrode 4. Spacer 5. Liquid crystal cell 6a. Upper electrode substrate 6b. Lower electrode substrate 7a. Upper electrode 7b. Lower electrode 8. Spacer 9. Liquid crystal 10. 10. Optically anisotropic polymer film (retardation plate) Upper polarizing plate 12. Lower polarizing plate 13. Reflector 202a. Direction of optical axis of upper electrode substrate of input device 202b. Direction of optical axis of lower electrode substrate of input device 206a. Orientation direction of liquid crystal molecules in contact with inner surface of upper electrode substrate 206b. 210. Alignment direction of liquid crystal molecules in contact with the inner surface of lower electrode substrate Direction of slow axis of retardation plate 211. Direction of polarization axis of upper polarizer 212. The direction of the polarization axis of the lower polarizing plate 301. Input device 302a. Upper electrode substrate 302b. Lower electrode substrate 303a. Upper electrode 303b. Lower electrode 304. Spacer 305. Liquid crystal cell 306a. Upper electrode substrate 306b. Lower electrode substrate 307a. Upper electrode 307b. Lower electrode 308. Spacer 309. Liquid crystal 310. Optically anisotropic polymer film (retardation plate) 311. Upper polarizing plate 312. Lower polarizing plate 313. Reflector 401. Input device 402a. Upper electrode substrate 402b. Lower electrode substrate 403a. Upper electrode 403b. Lower electrode 404. Spacer 405. Liquid crystal cell 406a. Upper electrode substrate 406b. Lower electrode substrate 407a. Upper electrode 407b. Lower electrode 408. Spacer 409. Liquid crystal 410. Optically anisotropic polymer film (retardation plate) 411. Upper polarizing plate 412. Lower polarizing plate 413. Reflector α. Angle β between the direction of the slow axis of the retardation plate and the orientation direction of the liquid crystal molecules in contact with the inner surface of the lower electrode substrate of the liquid crystal cell. The angle between the polarization axis direction of the upper polarizer and the orientation direction of the liquid crystal molecules in contact with the inner surface of the lower electrode substrate of the liquid crystal cell. Angle θ between the direction of the polarization axis of the lower polarizer and the orientation direction of the liquid crystal molecules in contact with the inner surface of the lower electrode substrate of the liquid crystal cell. Twist angle of liquid crystal twisted between the upper electrode substrate of the liquid crystal cell and the lower electrode substrate of the liquid crystal cell δ1. Narrow angle δ2 between the direction of the optical axis of the upper electrode substrate of the input device and the direction of the polarization axis of the upper polarizer. Narrow angle between the direction of the optical axis of the lower electrode substrate of the input device and the direction of the polarization axis of the upper polarizer

Claims (9)

[Claims] 1. A liquid crystal cell comprising a pair of substrates having display electrodes on opposing inner surfaces sandwiched between nematic liquid crystals twisted in a range of 180 degrees to 360 degrees, and at least one optically anisotropic layer. Polymer device, and an input device including a pair of substrates having input electrodes on inner surfaces facing each other,
In a liquid crystal display device with an input function having a pair of polarizing plates, the liquid crystal cell, the optically anisotropic polymer film, and the input device are arranged between the pair of polarizing plates, and the optically anisotropic member is provided. The conductive polymer film is disposed adjacent to the liquid crystal cell, and an angle between a polarization axis of the one polarizing plate adjacent to the input device and an optical axis direction of one substrate of the input device is δ. When the value of the retardation of one of the substrates of the input device is R, R is given by A liquid crystal display device with an input function, characterized in that: 2. The liquid crystal display device with an input function according to claim 1, wherein said optically anisotropic polymer film is disposed between said liquid crystal cell and said input device. 3. An input function according to claim 1, wherein said optically anisotropic polymer film is disposed between said liquid crystal cell and said polarizing plate adjacent to said liquid crystal cell. Liquid crystal display element. 4. The substrate of the input device and the one polarizing plate are adhered via an adhesive layer, and the optically anisotropic polymer film, the liquid crystal cell, and one of the pair of polarizing plates are provided. A polarizing plate is attached via an adhesive layer, and furthermore, an angle δ between the direction of the optical axis of the substrate of the input device and the direction of the polarizing axis of the polarizing plate adjacent to the input device, When the retardation value of the substrate is R: The liquid crystal display device with an input function according to any one of claims 1 to 3, wherein: 5. A liquid crystal display with an input function according to claim 1, wherein a surface of one of said pair of polarizing plates is subjected to a non-glare treatment or an anti-reflection treatment. element. 6. The liquid crystal display device with an input function according to claim 1, wherein said optically anisotropic polymer film is a uniaxially stretched film. 7. An input function according to claim 1, wherein said optically anisotropic polymer film is made of polycarbonate, polysulfone, polyethersulfone, polyvinyl alcohol or polyarylate. Liquid crystal display element. 8. The liquid crystal display device with an input function according to claim 1, wherein said optically anisotropic polymer film is a liquid crystal polymer film having a twisted orientation. 9. An electronic device comprising the liquid crystal display device with an input function according to claim 1 as a display device.