JPH0990348A - Color liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make color display by using the double refraction effect of liquid crystals and phase difference plates without using color filters. SOLUTION: The uniaxially stretched phase difference plates 12, 13 and liquid crystal cells 6 are held between a front surface side polarizing plate 1 and a rear surface side polarizing plate 5. The liquid crystal molecules 4 of the liquid crystal cells 6 are twist oriented at 200 to 260 deg. twist angle. The ΔnLC.dLC of the layer is specified to 1.0 to 1.8μm and at least one sheet of the phase difference plates are >=1.0μm in the product ΔnF.dF of the refractive index anisotropy ΔnF and sheet thickness dF of the phase difference plates. The total sum of the respective ΔnF.dF is specified to a range of 1.0 to 1.5 times the ΔnLC.dLC of the liquid crystal cells. The further white display is obtd. at the time of impression of the off voltage. The color liquid crystal display panel which the color purity is enhanced, the number of colors is increased, the intra-surface unequalness of the phase differences is suppressed and the cost is reduced is thus obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display panel. More specifically, the present invention relates to a color liquid crystal display panel that can perform color display without using a color filter.

[0002]

2. Description of the Related Art A conventional color liquid crystal display panel capable of obtaining a colored display comprises a liquid crystal cell having a color filter and a pair of polarizing plates arranged with the liquid crystal cell interposed therebetween. The color filter is provided on one of the substrates of the liquid crystal cell, and the color filter is formed on the substrate, and the transparent electrode is formed thereon. The liquid crystal cell is subjected to a twist alignment treatment, and the liquid crystal layer assumes two states, that is, the liquid crystal layer performs a rising alignment and remains twisted depending on whether a voltage is applied or not applied. By combining this with a polarizing plate, the incident light is transmitted to provide a bright display of the color colored by the color filter, or the incident light is blocked, resulting in a dark (black) display.

However, a color liquid crystal display panel using a color filter has a problem that the light transmittance is low and the display is dark because a colored light is obtained using the color filter. Therefore, a color liquid crystal display device in which light is colored by birefringence of a liquid crystal layer of a liquid crystal cell and a polarizing plate without using a color filter (Japanese Patent Laid-Open No. 6-30848).
No. 1) and a color liquid crystal display device utilizing not only the liquid crystal layer but also the birefringence of the retardation plate (Japanese Patent Laid-Open No. 6-301006).

[0004]

However, the color liquid crystal display device using the conventional color filter described above is
It has a problem of low light transmittance, which is due to absorption of light by the color filter. Further, the color liquid crystal display device (JP-A-6-308481) in which light is colored by the birefringence of the liquid crystal layer of the liquid crystal cell and the polarizing plate has a problem that the number of colors that can be displayed is small and white is colored. The color liquid crystal display device (Japanese Patent Laid-Open No. 6-301006) that utilizes not only the liquid crystal layer but also the birefringence of the retardation plate has a problem that the number of colors that can be displayed is small, white is slightly colored, and color purity is low. .

In order to solve the above-mentioned conventional problems, the present invention provides a color liquid crystal display panel in which transmitted light is colored without using a color filter, white coloring is suppressed, a large number of colors can be displayed, and color purity is good. It is intended to be provided.

[0006]

In order to achieve the above object, the first color liquid crystal display panel of the present invention sandwiches a liquid crystal between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces. , The molecules of the liquid crystal are twist-aligned between the upper and lower electrode substrates in the range of 100 ° to 170 °, and the product of the optical anisotropy Δn _LC of the liquid crystal and the liquid crystal layer thickness d _LC (μm) of the liquid crystal Δn _LC. It comprises a liquid crystal cell having d _LC in the range of 1.0 μm to 1.6 μm, and two polarizing plates arranged with the liquid crystal cell interposed therebetween, and the transmission axis of the polarizing plate is adjacent to the polarizing plate of the liquid crystal cell. 45 with respect to the orientation direction of liquid crystal molecules on the substrate side
The feature is that it is slanted by ± 5 °. This first configuration can be applied to both a transmissive color liquid crystal display panel and a reflective color liquid crystal display panel. When it is applied to a reflective panel, it reflects on the outer surface of the polarizing plate on the back side. Provide a plate.

In the above structure, the transparent electrode is provided on the opposite surface.
The liquid crystal is sandwiched between the two formed upper and lower electrode substrates,
Twist liquid crystal molecules between upper and lower electrode substrates by 150 ° ± 5 °
The optical anisotropy Δn of the liquid crystal is oriented._LCAnd the liquid crystal of the liquid crystal
Layer thickness d_LC(Μm) product Δn _LC・ D_LC1.4 μm ±
A liquid crystal cell of 0.05 μm and the liquid crystal cell sandwiched between
It consists of two polarizing plates placed, and the transmission of the polarizing plate
Liquid crystal molecules whose axes are on the side of the substrate adjacent to the polarizing plate of the liquid crystal cell
It is preferable to shift it at an angle of 45 ° ± 5 ° with respect to the orientation direction.
Good. This configuration also applies to a transmissive color liquid crystal display panel.
Also applicable to reflective color LCD panels
When applying to a reflective panel,
A reflector is provided on the outer surface.

Next, the second color liquid crystal display panel of the present invention is used.
The flannel is two upper and lower electrodes with transparent electrodes formed on opposite surfaces.
A liquid crystal is sandwiched between substrates, and the molecules of the liquid crystal are placed on the upper and lower electrode substrates.
Twist orientation in the range of 200 ° -260 ° between
Optical anisotropy of liquid crystal Δn_LCAnd the liquid crystal layer thickness d of the liquid crystal
_LC(Μm) product Δn_LC・ D_LC1.0 μm to 1.8 μm
A liquid crystal cell having a range of m and arranged with the liquid crystal cell sandwiched therebetween.
At least one of the two polarizing plates and the liquid crystal cell
From two or more retardation plates placed between
And at least one of the retardation plates is the retardation plate.
Anisotropy of refractive index Δn _FAnd plate thickness d_FProduct Δn_F・ D_FIs 1.
0 μm or more, and each of the two or more retardation plates
Δn_F・ D_FIs the sum of Δn of the liquid crystal cell_LC・ D_LCof
It is characterized in that the range is 1.0 to 1.5 times. This
The configuration of the transmissive color liquid crystal display panel is
It is also applicable to the color liquid crystal display panel of
When applied to a panel, it reflects on the outer surface of the polarizing plate on the back side.
Provide a plate. In the case of a transmissive type, the polarizing plate on the light incident side
Liquid on the substrate adjacent to the polarizing plate of the liquid crystal cell and the transmission axis
The deviation angle from the crystal molecule orientation direction is desired to be within 45 ° ± 5 °
In the case of a reflective type, the transmission axis of the polarizing plate adjacent to the reflection plate
And liquid crystal molecules on the side of the liquid crystal cell adjacent to the polarizing plate.
The deviation angle from the orientation direction is preferably within the range of 45 ° ± 5 °.
Furthermore, it is desirable to use a three-dimensional refractive index controlled product for the retardation plate.
Good. Here, the three-dimensional refractive index control product is the one in the thickness direction.
Refractive index n_zIs the refractive index n in one direction of the plane_yMade bigger
A film. Generally, like liquid crystal or retardation film
An optical anisotropic body has a three-dimensional refractive index (n_x, N_y,
n_z) Is not uniform and is represented by an index ellipsoid. Normal
Retardation film formed by stretching polymer film
N_x, N_y, N_z(X is the slow axis) and refraction
The value of the refractive index varies depending on the viewing direction of the index ellipsoid.
Therefore, the viewing angle becomes dependent. This visual property is improved
As a phase difference film, for example, a polycarbonate film
There is a dimensional refractive index control film.

In the above structure, a liquid crystal is sandwiched between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces, and molecules of the liquid crystal are twist-aligned between the upper and lower electrode substrates in a range of 230 ° to 260 °. The liquid crystal cell is sandwiched between a liquid crystal cell in which the product Δn _LC · d _LC of the optical anisotropy Δn _LC of the liquid crystal and the liquid crystal layer thickness d _LC (μm) of the liquid crystal is 1.6 μm ± 0.05 μm. And two retardation plates disposed between the liquid crystal cell and the front-side polarizing plate. One of the retardation plates is a retardation plate. is 1.3 .mu.m ± product Δn _F · d _F of the refractive index anisotropy [Delta] n _F and the plate thickness d _F
It is 0.05 μm, and the sum of Δn _F · d _F of each of the two retardation plates is 1.0 to 1.2 times the Δn _LC · d _LC of the liquid crystal cell. preferable. This structure can be applied to both a transmissive color liquid crystal display panel and a reflective color liquid crystal display panel. When the reflective panel is used, a reflector is provided on the outer surface of the polarizing plate on the back surface side. In the case of the transmissive type, the deviation angle between the transmission axis of the polarizing plate on the light incident side and the liquid crystal molecule alignment direction on the side of the liquid crystal cell adjacent to the polarizing plate is preferably in the range of 45 ° ± 5 °. In this case, the shift angle between the transmission axis of the polarizing plate adjacent to the reflector and the alignment direction of the liquid crystal molecules on the polarizing plate adjacent substrate side of the liquid crystal cell is preferably in the range of 45 ° ± 5 °.
Further, it is desirable to use a three-dimensional refractive index control product for the retardation plate.

Further, in the above structure, a liquid crystal is sandwiched between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces,
The molecules of the liquid crystal are twist-aligned between the upper and lower electrode substrates in the range of 230 ° to 260 ° to obtain the optical anisotropy Δn of the liquid crystal.
The product of _LC and the liquid crystal layer thickness d _LC (μm) of the liquid crystal Δn _LC · d
A liquid crystal cell having an _LC of 1.5 μm ± 0.05 μm, two polarizing plates arranged with the liquid crystal cell sandwiched therebetween, and one plate between the liquid crystal cell and each of the front and back side polarizing plates. Two retardation plates arranged one by one, and one of the retardation plates is a product Δ of the refractive index anisotropy Δn _{F of the} retardation plate and the plate thickness d _F.
n _F · d _F is 1.4 μm ± 0.05 μm, and the sum of Δn _F · d _F of each of the two retardation plates is 1.1 times the Δn _LC · d _LC of the liquid crystal cell. The range is preferably 1.3 times. This structure can be applied to both a transmissive color liquid crystal display panel and a reflective color liquid crystal display panel. When the reflective panel is used, a reflector is provided on the outer surface of the polarizing plate on the back surface side. In the case of the transmissive type, the deviation angle between the transmission axis of the polarizing plate on the light incident side and the liquid crystal molecule alignment direction on the side of the liquid crystal cell adjacent to the polarizing plate is preferably in the range of 45 ° ± 5 °. In this case, the shift angle between the transmission axis of the polarizing plate adjacent to the reflector and the alignment direction of the liquid crystal molecules on the polarizing plate adjacent substrate side of the liquid crystal cell is preferably in the range of 45 ° ± 5 °. Further, it is desirable to use a three-dimensional refractive index control product for the retardation plate.

Next, in the third color liquid crystal display panel of the present invention, the liquid crystal is sandwiched between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces, and the molecules of the liquid crystal are sandwiched between the upper and lower electrode substrates. Twist alignment is performed in the range of 200 ° to 260 °, the optical anisotropy Δn _LC of the liquid crystal and the liquid crystal layer thickness d of the liquid crystal.
The product of _LC (μm) Δn _LC · d _LC is 0.6 μm to 1.8 μm
a liquid crystal cell having a range of m, a polarizing plate arranged on the front surface side across the liquid crystal cell and having a polarizing ability over the entire visible light, and a polarizing plate arranged on the back surface side having no red polarizing ability, It is characterized by comprising two or more retardation plates arranged between the liquid crystal cell and at least one polarizing plate. This configuration also applies to the transmissive color liquid crystal display panel,
It can also be applied to reflective color liquid crystal display panels,
When applied to a reflection type panel, a reflection plate is provided on the outer surface of the polarizing plate on the back surface side. In the case of the transmissive type, the deviation angle between the transmission axis of the polarizing plate on the light incident side and the liquid crystal molecule alignment direction on the side of the liquid crystal cell adjacent to the polarizing plate is preferably in the range of 45 ° ± 5 °. In this case, the shift angle between the transmission axis of the polarizing plate adjacent to the reflector and the alignment direction of the liquid crystal molecules on the polarizing plate adjacent substrate side of the liquid crystal cell is preferably in the range of 45 ° ± 5 °. Further, it is desirable to use a three-dimensional refractive index control product for the retardation plate.

In the first to third color liquid crystal display panels, it is preferable that a reflection plate is provided outside the polarizing plate arranged on the back surface side. In the second to third color liquid crystal display panels, the transmission axis of the polarizing plate on the light incident side is inclined 45 ° ± 5 ° with respect to the liquid crystal molecule alignment direction on the polarizing plate adjacent substrate side of the liquid crystal cell. It is preferable to shift them.

Further, in the second to third color liquid crystal display panels, a reflection plate is provided outside the polarizing plate arranged on the back surface side, and the transmission axis of the polarizing plate adjacent to the reflection plate is It is preferable that the liquid crystal cell is slanted by 45 ° ± 5 ° with respect to the alignment direction of liquid crystal molecules on the side of the polarizing plate adjacent substrate.

In the second to third color liquid crystal display panels, it is preferable to use three-dimensional refractive index control means for the retardation plate arranged between the liquid crystal cell and at least one polarizing plate. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the color liquid crystal display panel to which the first structure is applied, when the liquid crystal molecules of the liquid crystal cell are in the twist orientation, a straight line which is incident on the liquid crystal cell through one polarizing plate is used. The polarized light becomes elliptically polarized light due to the birefringence of the liquid crystal cell in the process of passing through the liquid crystal cell, and enters the other polarizing plate.

When a voltage is applied between the electrodes of the liquid crystal cell, the birefringence in the liquid crystal cell changes due to the change in the alignment state of the liquid crystal molecules, so that light having a polarization state different from that in the state in which no voltage is applied becomes light of the other polarization. When the light enters the plate and the liquid crystal molecules rise almost vertically, the birefringence due to the liquid crystal cell almost disappears, and the linearly polarized light that has entered through one polarization plate enters the other polarization plate in its polarization state.

If the light incident on one of the polarizing plates is the same linearly polarized light as that after the other polarizing plate is emitted, all wavelength light is transmitted through the polarizing plate, and at this time, the emitted light is uncolored light. . When the light incident on the other polarizing plate is elliptically polarized light, only the light of the wavelength of the polarization component that passes through the polarizing plate among the light passes through the other polarizing plate, and this outgoing light falls within that wavelength band. It becomes the corresponding colored light.

Since the wavelength band of the light emitted through the other polarizing plate differs depending on the polarization state of the elliptically polarized light incident on the polarizing plate, the polarization state of the elliptically polarized light is controlled by controlling the voltage applied to the liquid crystal cell. The color of the colored light can be changed by changing.

Further, Δn _LC · d _LC of the liquid crystal layer is 1.0 μm
In the case of 1.6 [mu] m, 100 [deg.] To 170 [deg.] Twist orientation, the light incident on one of the polarizing plates becomes linearly polarized light after the other polarizing plate exits without applying any voltage, and thus a color close to white can be displayed. Furthermore, Δn _LC · dLC is 1.4 μm ± 0.0
In the case of 5 μm and 150 ° ± 5 ° twist orientation, the light incident on one polarizing plate becomes a linearly polarized light which is almost the same as that after the other polarizing plate is emitted, and thus a color closer to white can be displayed.

In the color liquid crystal display panel to which the second structure is applied, the transmitted light is colored by the birefringence of the retardation plate, and the birefringence of the retardation plate and the liquid crystal in which the liquid crystal molecules are twist-aligned. The transmitted light is colored in another color due to the birefringence of.

In the state where no voltage is applied between the electrodes of the liquid crystal cell, the light incident through one of the polarizing plates is caused by the birefringence of the twist-aligned liquid crystal molecules and the birefringence of the retardation plate, and the other When it passes through the polarizing plate of, it becomes uncolored light.

When a voltage is applied between the electrodes of the liquid crystal cell, the birefringence in the liquid crystal cell changes in accordance with the change in the alignment state of the liquid crystal molecules. Therefore, the birefringence of both the retardation plate and the liquid crystal cell causes coloring. The color of light changes.

When a voltage is further applied and the liquid crystal molecules rise almost vertically to the substrate surface, the birefringence due to the liquid crystal cell is almost eliminated, and the light transmitted through the other polarizing plate is
It becomes colored light only by the birefringence of the retardation plate.

Further, Δn of the liquid crystal layer_LC・ D_LC1.0 μm
1.8 μm, 200 ° to 260 ° twist orientation, liquid
2 disposed between the crystal cell and at least one polarizing plate
One of the phase difference plates is an anisotropic refractive index of the phase difference plate.
Sex Δn_FAnd plate thickness d_FProduct Δn _F・ D_FIs 1.0 μm or more
And Δn of each of the two or more retardation plates_F・ D_Fof
The sum is Δn of the liquid crystal cell_LC・ D_LC1.0 to 1.5 times
If, the light incident on one of the polarizing plates is not applied.
Becomes a linearly polarized light near the other polarizing plate, so it becomes white.
Can display similar colors. Furthermore Δn_LC・ D_LC1.6 μm
± 0.05μm, 230 ° ~ 260 ° twist orientation
, One of the retarders is the refractive index anisotropy Δn of the retarder.
_FAnd plate thickness d_FProduct Δn_F・ D_FIs 1.3 μm ± 0.05 μ
m and Δn of each of the two retardation plates_F・ D_FTotal of
The sum is the Δn of the liquid crystal cell_LC・ D_LC1.0 times to 1.2 times
If no light is applied, the light that enters one polarizing plate
Since the linearly polarized light is almost the same as after exiting from the other polarizing plate, white
You can display a color that is closer to the color. Similarly Δn_LC・ D_LCTo
1.5μm ± 0.05μm, 230 ° ~ 260 ° twist
Between the liquid crystal cell and the polarizing plates on the front and back sides.
One of the two retardation plates placed one between
Refractive index anisotropy Δn of retardation plate_FAnd plate thickness d_FProduct Δn_F・ D_F
Is 1.4 μm ± 0.05 μm, and of the two phase difference plates
Each Δn_F・ D_FIs the sum of the liquid crystal cell Δn_LC・ D
_LC1.1 times to 1.3 times the
Light incident on one polarizing plate is almost the same as after it exits the other polarizing plate
Since it becomes a new linearly polarized light, a color closer to white can be displayed.
You.

In the color liquid crystal display panel to which the third structure is applied, the transmitted light is colored by the birefringence of the retardation plate, and the birefringence of the retardation plate and the liquid crystal molecules are adjusted to 2%.
The transmitted light is colored in another color due to the birefringence of the liquid crystal which is twisted at 00 ° to 260 °, and a polarizing plate having no red polarization ability is used on the rear surface side of the liquid crystal cell. When the non-linearly polarized light is incident on the polarizing plate disposed on the back surface side of the liquid crystal cell and having no red polarization ability, the light of wavelengths other than red becomes linearly polarized light, and the light of red wavelength passes through as non-linearly polarized light. After that, the polarization state of the light is changed by the twist-oriented liquid crystal cell and the retardation plate, and becomes linearly polarized light when emitted from the polarizing plate on the surface side of the liquid crystal cell.

In the state where no voltage is applied between the electrodes of the liquid crystal cell, the polarized light transmitted through the polarizing plate on the back surface side is also emitted from the polarizing plate on the front surface side as the linearly polarized light of red wavelength. It becomes uncolored light.

When a voltage is applied between the electrodes of the liquid crystal cell,
The alignment state of the liquid crystal molecules changes and the birefringence changes, resulting in red light. When voltage is further applied and the liquid crystal molecules rise almost perpendicularly to the substrate surface, the birefringence due to the liquid crystal cell almost disappears, and the light transmitted through the polarizing plate on the back surface is
Although it receives only the birefringence of the retardation plate, it does not coincide with the transmission axis of the polarizing plate on the front surface side, resulting in black display.

Further, when a reflecting plate is provided on the outer surface of the polarizing plate on the back surface side, the incident light from the front surface side is reflected by the reflecting plate through one polarizing plate, the liquid crystal cell and the other polarizing plate, and is reflected again. The light is emitted through the other polarizing plate, the liquid crystal cell, and one polarizing plate. At this time, the polarization state is further changed in the process of being reflected by the reflection plate and passing through the liquid crystal cell again.

The birefringence of the liquid crystal layer twist-aligned with respect to the linearly polarized light is greatest when the linearly polarized light is incident at an angle of 45 ° from the alignment direction of the liquid crystal molecules on the incident side of the liquid crystal cell. The color purity is improved by offsetting the axis and the liquid crystal molecule alignment direction on the side of the liquid crystal cell adjacent to the polarizing plate by 45 ° ± 5 °.

The retardation plate used in the color liquid crystal display panel to which the second to third configurations are applied is a three-dimensional refractive index controlled product, so that the birefringence when the panel is viewed from the front and the panel are Since the difference in birefringence when viewed at an angle is small, the viewing angle dependence of the panel is small.

[0031]

EXAMPLES The present invention will be described in more detail below with reference to examples. (Embodiment 1) Hereinafter, an embodiment of the first invention will be described with reference to FIGS. FIG. 1 is a sectional view of a color liquid crystal display panel of this embodiment. This color liquid crystal display panel includes one liquid crystal cell 6 in which liquid crystal molecules 4 are twist-aligned,
The liquid crystal cell 6 is sandwiched between a pair of polarizing plates 1 and 5. The liquid crystal cell 6 is a simple matrix type,
The electrodes 3 on the front-side transparent substrate 2 are a plurality of scanning electrodes formed in parallel to each other, and the electrodes 3 on the back-side transparent substrate 2 are a plurality of signal electrodes formed in a direction orthogonal to the scanning electrodes. An alignment film was applied to the substrate, spacers having a particle size of 7.0 μm were dispersed between both substrates, and a sealant was printed on the peripheral portion and bonded. A tolan nematic liquid crystal (Δn = 0.2) having a chiral pitch of 18.42 μm was vacuum-injected and then sealed.

FIG. 2 is a plan view showing liquid crystal molecule alignment directions 9 and 10 of the liquid crystal cell 6 and transmission axes 8 and 11 of a pair of polarizing plates. The angle between the liquid crystal molecule orientation direction 9 of the front side transparent substrate, the liquid crystal molecule orientation direction 10 of the back side transparent substrate and the reference line 7 is θ1 = 165 °, θ2 = 195 °, and the liquid crystal molecules are oriented from the back side to the front side. Was twist-oriented at a twist angle of about 150 °. The angle between the transmission axis 8 of the front-side polarizing plate, the transmission axis 11 of the rear-side polarizing plate and the reference line 7 is ξ1 = 12.
0 ° and {2 = 60}.

FIG. 3 is a CIE chromaticity diagram showing a color change of colored light when a backlight is installed in the color liquid crystal display panel having the above-mentioned structure and a voltage is applied. CI in a conventional color liquid crystal display panel (Japanese Patent Laid-Open No. 6-308481)
E chromaticity coordinates (x, y) are white (0.36, 0.29),
Red (0.46, 0.39), blue (0.25, 0.2)
2) However, from FIG. 3, the CIE chromaticity coordinates (x, y) when no voltage is applied are (0.35, 0.35) when the panel configuration of this embodiment is adopted, which is more than that of the conventional panel. D65
Close to white light source (0.3127, 0.3291), red (0.51, 0.35) and blue (0.20, 0.16)
Therefore, a color liquid crystal display panel with good color purity can be provided at low cost because there is no color filter. In addition, the twist angle is as shallow as 150 °, the alignment of liquid crystal molecules is easily stabilized, and the display capacity is small, and the orientation is low duty.

In this embodiment, the liquid crystal cell 6 has a liquid crystal molecule 4 with a twist angle of about 150 °, and Δn of the liquid crystal layer is increased.
_LC · d _LC was 1.40 μm, but this liquid crystal cell 6
The liquid crystal molecules 4 may be twist-aligned at a twist angle of 100 ° to 170 °, and Δn _LC · d _LC of the liquid crystal layer is 1.0 μ.
It may be m to 1.6 μm. In order to obtain a white display when no voltage is applied, the twist angle of the liquid crystal molecules 4 in the liquid crystal cell 6 is 150 ° ± 5 °, and Δn _LC · d _LC of the liquid crystal layer is 1.40 μm ± 0.05 μm. desirable. In addition, in the present embodiment, the deviation angle between the transmission axes 8 and 11 of the polarizing plates and the liquid crystal molecule alignment directions 9 and 10 of the substrates adjacent to the respective polarizing plates is 4.
Although it is set to 5 °, it is desirable that this shift angle is 45 ° ± 5 °. Further, in the present embodiment, the color liquid crystal display panel is a transmissive type in which a backlight is installed, but a reflective type color liquid crystal display panel may be provided by attaching a reflection plate to the outside of the back side polarizing plate.

(Embodiment 2) An embodiment of the second invention will be described below with reference to FIGS. FIG. 4 is a sectional view of the color liquid crystal display panel of this embodiment. This color liquid crystal display panel includes one liquid crystal cell 6 in which liquid crystal molecules 4 are twist-aligned, a pair of polarizing plates 1 and 5 arranged with the liquid crystal cell 6 in between, a liquid crystal cell 6 and a polarizing plate 1 on the front surface side. It is composed of two retardation plates 12 and 13 disposed between the two. The liquid crystal cell 6 is a simple matrix type, and the front transparent substrate 2
The upper electrode 3 is a plurality of scanning electrodes formed in parallel with each other, and the electrode 3 on the rear transparent substrate 2 is a plurality of signal electrodes formed in a direction orthogonal to the scanning electrodes, and an alignment film is applied thereto. Then, a spacer having a particle size of 8.0 μm was scattered between both substrates, and a sealant was printed on the peripheral portion and bonded. Toran-based nematic liquid crystal with a chiral pitch of 13.3 μm (Δn
_LC = 0.2) was vacuum-injected and then sealed.

FIG. 5 shows liquid crystal molecule alignment directions 9 and 10 of the liquid crystal cell 6, slow axis directions 14 and 15 of two polycarbonate uniaxially stretched retardation plates, and transmission axes 8 and 1 of a pair of polarizing plates.
FIG. The angles between the liquid crystal molecule orientation direction 9 of the front side transparent substrate, the liquid crystal molecule orientation direction 10 of the back side transparent substrate and the reference line 7 are θ1 = 215 ° and θ2 = 145 °, and the liquid crystal molecules are oriented from the back side to the front side. 4 to almost 25
Twist orientation was performed at a twist angle of 0 °. The angle between the slow axis direction 14 of the uniaxially stretched retardation plate adjacent to the front-side polarizing plate 1 and the reference line 7 is ψ1 = 136 °, ΔnF ₁ · dF ₁ =
1.294 μm, and the angle between the slow axis direction 15 of the uniaxially stretched phase difference plate adjacent to the liquid crystal cell 6 and the reference line 7 is ψ2
= 124.5 ° and ΔnF ₂ · dF ₂ = 0.392 μm. Transmission axis 8 of front side polarizing plate, transmission axis 1 of back side polarizing plate
The angle between 1 and the reference line 7 was {1 = 3} and {2 = 100}.

A backlight is installed in the color liquid crystal display panel having the above structure, and voltage is driven at a duty of (1/200) to (1/240) and a bias of (1/14) to (1/17). It was controlled by the frame rate control method. FIG. 6 is a CIE chromaticity diagram showing a color change of colored light when a voltage is applied. CIE chromaticity coordinates (x, y) in a conventional color liquid crystal display panel (Japanese Patent Laid-Open No. 6-308481) are white (0.36, 0.29), red (0.46, 0.39), blue ( 0.25, 0.2
2) and green (0.27, 0.47), the CIE chromaticity coordinates (x, y) when the off voltage is applied are (0. 34,
0.32), which is closer to the D65 white light source (0.3127, 0.3291) than the conventional panel and red (0.5
6, 0.29), blue (0.16, 0.16), green (0.21, 0.52), and a color liquid crystal display panel with good color purity can be provided.

Further, in the conventional color liquid crystal display panel (JP-A-6-175125), Δn _LC · d of the liquid crystal layer is
_LC is 1.0 μm to 2.0 μm and the number of retardation plates is N
Like to the the product Δn _F · d _F of the refractive index anisotropy [Delta] n _F and the plate thickness d _F of the retardation plate _{Δn LC · d LC × (0.70~0.95} )
It is set to x (1 / N). In this case, when the number of retardation plates is two or more, Δn _F · d _F of the retardation plates is 1.0 μm or less. However, in order to increase the color purity of the color liquid crystal display panel and increase the number of colors, at least one of the retardation plates needs to have Δn _F · d _F > 1.0 μm. When Δn _F · d _F of all the retardation plates is 1.0 μm or less, the color purity is poor or the number of colors is small. On the contrary, when Δn _F · d _F of all retardation plates is 1.0 μm or more, Δn _F · d _F
The phase difference plate of> 1.0 μm has a problem that the phase difference between lots and lots during the formation of the phase difference plate is larger than that of the phase difference plate of Δn _F · d _F <1.0 μm, and the cost increases. . Therefore, at least one of the retardation plates should be Δn _F
・ D _F > 1.0 μm, and other phase difference plates are Δn _F・ d _F <
By setting the thickness to 1.0 μm, it is possible to provide a color liquid crystal display panel in which color purity is increased, the number of colors is increased, in-plane unevenness of retardation is suppressed, and cost is suppressed.

In this embodiment, the liquid crystal cell 6 has a liquid crystal molecule 4 having a twist angle of approximately 250 ° and Δn of the liquid crystal layer.
_LC · d _LC is set to 1.60 μm, and two phase difference plates 12 and 1
Although Δn _F · d _F of 3 was 0.392 μm and 1.294 μm, the liquid crystal cell 6 had liquid crystal molecules 4 of 200 ° to 26 °.
Twist orientation may be performed at a twist angle of 0 °, Δn _LC · d _LC of the liquid crystal layer may be 1.0 μm to 1.8 μm, and at least one retardation plate may have a different refractive index. The product Δn _F · d _{F of the} anisotropic Δn _F and the plate thickness d _F is 1.0 μm or more, and the sum of Δn _F · d _F of the retardation plates is 1 of Δn _LC · d _LC of the liquid crystal cell 6. It may be in the range of 0.0 times to 1.5 times. Furthermore, in order to obtain a white display by applying an off voltage, the liquid crystal cell 6 has a liquid crystal molecule 4 with a twist angle of 230 ° to 260 °, and Δn _LC · d _LC of the liquid crystal layer is 1.
And 60 [mu] m ± 0.05 .mu.m, the product of one of the phase difference plate and the refractive index anisotropy [Delta] n _F and the plate thickness d _F of the retardation plate Δn _F · d _F
Is 1.3 μm ± 0.05 μm, and the sum of Δn _F · d _F of each of the two retardation plates is Δn _LC · of the liquid crystal cell 6.
It is desirable to be 1.0 to 1.2 times d _LC .

Further, in this embodiment, the uniaxially stretched retardation plate 1 is used.
Although polycarbonate is used for 2 and 13, polyvinyl alcohol, polyarylate, polyether sulfone, etc. may be used.

In the present embodiment, the shift angle between the transmission axis 11 of the back side polarizing plate and the liquid crystal molecule alignment direction 10 of the back side polarizing plate adjacent substrate is 45 °, but this shift angle is 45 °. ± 5 ° is desirable.

Further, in this embodiment, the color liquid crystal display panel is a transmissive type in which a backlight is installed, but a reflective type color liquid crystal display panel may be formed by attaching a reflection plate to the outside of the back side polarizing plate. In the case of a reflective color liquid crystal display panel, the transmission axis 11 of the back side polarizing plate and the liquid crystal molecule orientation direction 10 of the polarizing plate adjacent substrate adjacent to the reflecting plate 16 are arranged.
It is desirable that the deviation angle from the angle is 45 ° ± 5 °. Further, Δn _F · d _F is 0.392 μm, and Δn when viewed from the vertical direction instead of the two uniaxially drawn retardation plates of 1.294 μm.
_F · d _F equals respectively uniaxially stretched phase difference plate 2 sheets above, two three-dimensional refractive index control film of N _z coefficient of 0.7 (e.g. Nitto Denko under the trade name: NZ films, polycarbonate resin ), A color liquid crystal display panel having a wide viewing angle may be obtained.

(Embodiment 3) Another embodiment of the second invention will be described below with reference to FIGS. FIG. 7 is a sectional view of the color liquid crystal display panel of this embodiment. This color liquid crystal display panel includes one liquid crystal cell 6 in which liquid crystal molecules 4 are twist-aligned, a pair of polarizing plates 1 and 5 arranged with the liquid crystal cell 6 sandwiched therebetween, and the liquid crystal cell 6 and front and back surfaces. Two retardation plates 1 arranged one by one between the polarizing plates 1 and 5.
2 and 13 and the reflector 1 arranged on the outer surface of the back side polarizing plate
6 The liquid crystal cell 6 is of a simple matrix type, the electrodes 3 on the front surface side transparent substrate 2 are a plurality of scanning electrodes formed in parallel with each other, and the electrodes 3 on the back surface side transparent substrate 2 are formed.
Is an alignment film coated on a plurality of signal electrodes formed in a direction orthogonal to the scanning electrodes, and has a grain size of 7.5 μm between both substrates.
m spacers were sprinkled, and a sealant was printed on the peripheral portion and then laminated. A tran nematic liquid crystal (Δn _LC = 0.2) having a chiral pitch of 12.5 μm was vacuum-injected and then sealed.

FIG. 8 shows liquid crystal molecule orientation directions 9 and 10 of the liquid crystal cell 6, slow axis directions 14 and 15 of two polycarbonate uniaxially stretched retardation plates, and transmission axes 8 and 1 of a pair of polarizing plates.
FIG. The angles between the liquid crystal molecule alignment direction 9 of the front surface side transparent substrate and the liquid crystal molecule alignment direction 10 of the back surface side transparent substrate and the reference line 7 are θ1 = 215 ° and θ2 = 145 °, and the liquid crystal molecules are arranged from the back surface side to the front surface side. Almost 250
Twist orientation was performed at a twist angle of ゜. Front side polarizing plate 1
The angle between the slow axis direction 14 of the uniaxially stretched retardation plate adjacent to the reference line 7 and the reference line 7 is ψ1 = 123 °, ΔnF ₁ · dF ₁ = 1.
374 μm, and the angle between the slow axis direction 15 of the uniaxially stretched retardation plate on the side adjacent to the back side polarizing plate 5 and the reference line 7 is ψ2.
= 86 ° and ΔnF ₂ · dF ₂ = 0.418 μm. The angles between the transmission axis 8 of the front-side polarizing plate and the transmission axis 11 of the back-side polarizing plate and the reference line 7 were ξ1 = 79.1 ° and ξ2 = 100 °.

A reflection plate 16 is attached to the outer surface of the back side polarizing plate 5 of the color liquid crystal display panel having the above-mentioned structure, and (1/20)
0)-(1/240) duty, (1/14)-
The voltage was driven with a (1/17) bias, and each gradation was controlled by the frame rate control method. FIG. 9 shows a CIE chromaticity diagram showing the color change of colored light when a voltage is applied. Conventional color liquid crystal display panel (Japanese Patent Laid-Open No. 6-3084)
No. 81), the CIE chromaticity coordinates (x, y) are white (0.36, 0.29) and red (0.46, 0.3).
9), blue (0.25, 0.22), green (0.27,
However, according to the panel configuration of this embodiment, the CIE chromaticity coordinates (x, y) at the time of applying the off voltage are (0.34, 0.32), D65 white light source (0.3127, 0.3291)
Close to, red (0.58, 0.34), blue (0.1
It is possible to provide a color liquid crystal display panel having good color purity of 8, 0.16) and green (0.19, 0.50).

Further, in the conventional color liquid crystal display panel (JP-A-6-175125), Δn _LC · d of the liquid crystal layer is
_LC is 1.0 μm to 2.0 μm and the number of retardation plates is N
Like to the the product Δn _F · d _F of the refractive index anisotropy [Delta] n _F and the plate thickness d _F of the retardation plate _{Δn LC · d LC × (0.70~0.95} )
It is set to x (1 / N). In this case, when the number of retardation plates is two or more, Δn _F · d _F of the retardation plates is 1.0 μm or less. However, in order to increase the color purity of the color liquid crystal display panel and increase the number of colors, at least one of the retardation plates needs to have Δn _F · d _F > 1.0 μm. When Δn _F · d _F of all the retardation plates is 1.0 μm or less, the color purity is poor or the number of colors is small. On the contrary, when Δn _F · d _F of all retardation plates is 1.0 μm or more, Δn _F · d _F
The phase difference plate of> 1.0 μm has a problem that the phase difference between lots and lots during the formation of the phase difference plate is larger than that of the phase difference plate of Δn _F · d _F <1.0 μm, and the cost increases. . Therefore, at least one of the retardation plates should be Δn _F
・ D _F > 1.0 μm, and other phase difference plates are Δn _F・ d _F <
By setting the thickness to 1.0 μm, it is possible to provide a color liquid crystal display panel in which color purity is increased, the number of colors is increased, in-plane unevenness of retardation is suppressed, and cost is suppressed.

In this embodiment, the liquid crystal cell 6 is a liquid crystal.
The twist angle of the molecule 4 is set to about 250 ° and Δn of the liquid crystal layer is set.
_LC・ D_LCIs set to 1.50 μm, and the two phase difference plates 12 and 1
Δn of 3_F・ D_FAre 0.418 μm and 1.374 μm
However, this liquid crystal cell 6 has liquid crystal molecules 4 at 200 ° to 26 °.
The liquid crystal layer may be twist-aligned at a twist angle of 0 °.
Δn_LC・ D_LCIs 1.0 μm to 1.8 μm
At least one of the retardation plates has a different refractive index.
Direction Δn_FAnd plate thickness d_FProduct Δn_F・ D_FIs 1.0 μm or more
And each Δn of the retardation plate_F・ D_FIs the sum of liquid crystal
Δn of cell_LC・ D _LC1.0 times to 1.5 times
I just need. Furthermore, a white display is obtained when the off voltage is applied.
The liquid crystal cell 6 has a twist angle of 2 as the liquid crystal cell 6.
30 ° to 260 ° and Δn of the liquid crystal layer_LC・ D_LCTo 1.5
0μm ± 0.05μm, one of the phase difference plate is the phase
Refractive index anisotropy Δn of the difference plate_FAnd plate thickness d_FProduct Δn_F・ D_FBut
1.4 μm ± 0.05 μm and the width of two retardation plates
Each Δn_F・ D_FIs the sum of the liquid crystal cell Δn_LC・ D_LC
It is desirable to be 1.1 to 1.3 times.

In this embodiment, the uniaxially stretched retardation plate 1 is used.
Although polycarbonate is used for 2 and 13, polyvinyl alcohol, polyarylate, polyether sulfone, etc. may be used.

Further, in the present embodiment, the shift angle between the transmission axis 11 of the back side polarizing plate and the liquid crystal molecule alignment direction 10 of the polarizing plate adjacent substrate adjacent to the reflecting plate 16 is 45 °. Is preferably 45 ° ± 5 °.

Further, in the present embodiment, the reflection type is formed by attaching the reflection plate 16 to the outside of the back side polarizing plate 5 of the color liquid crystal display panel, but it may be a transmission type color liquid crystal display panel with a backlight installed. Good. In the case of a transmission type color liquid crystal display panel, the transmission axis 11 of the back side polarizing plate,
It is desirable that the deviation angle between the substrate adjacent to the polarizing plate on the rear surface side and the alignment direction 10 of the liquid crystal molecules is 45 ° ± 5 °. A color liquid crystal display panel having a wide viewing angle may be obtained by using the same three-dimensional refractive index control product as in Example 2 for the two uniaxially stretched retardation plates 12 and 13.

(Embodiment 4) A third embodiment of the invention will be described below with reference to FIGS. FIG. 10 is a sectional view of the color liquid crystal display panel of this embodiment. This color liquid crystal display panel has one liquid crystal cell 6 in which liquid crystal molecules 4 are twist-aligned, a polarizing plate 1 arranged on the front surface side of the liquid crystal cell and having a polarizing ability over the entire visible light, and a rear surface side of the liquid crystal cell. A polarizing plate 5 having no red polarization function, a reflecting plate 16 arranged outside the back side polarizing plate, and two retardation plates 1 arranged between the liquid crystal cell 6 and the front side polarizing plate 1.
It consists of 2 and 13.

The liquid crystal cell 6 is of a simple matrix type, the electrodes 3 on the front transparent substrate 2 are a plurality of scanning electrodes formed in parallel to each other, and the electrodes 3 on the rear transparent substrate 2 are the scanning electrodes. An alignment film is applied on a plurality of signal electrodes formed in a direction orthogonal to the direction, and the grain size is 7.1 μm between both substrates.
Was sprayed, and a sealant was printed on the periphery and then bonded. A tolan nematic liquid crystal (Δn _LC = 0.14) having a chiral pitch of 11.9 μm was vacuum-injected and then sealed.

FIG. 11 shows liquid crystal molecule orientation directions 9 and 10 of the liquid crystal cell 6, slow axis directions 14 and 15 of two polycarbonate uniaxially stretched retardation plates, and transmission axes 8 of two polarizing plates.
11 is a plan view of FIG. The angles between the liquid crystal molecule alignment direction 9 of the front surface side transparent substrate and the liquid crystal molecule alignment direction 10 of the back surface side transparent substrate and the reference line 7 are θ1 = 215 ° and θ2 = 145 °, and the liquid crystal molecules are arranged from the back surface side to the front surface side. Almost 250
Twist orientation was performed at a twist angle of ゜. Front side polarizing plate 1
The angle between the slow axis direction 14 of the uniaxially stretched retardation plate adjacent to and the reference line 7 is ψ1 = 160 °, Δnd _F1 = 0.47.
2 μm, and the angle between the slow axis direction 15 of the uniaxially stretched retardation plate adjacent to the liquid crystal cell 6 and the reference line 7 is ψ2 = 12.
It was set to 9.5 ° and Δnd _F2 = 0.333 μm. The angles between the transmission axis 8 of the front-side polarizing plate and the transmission axis 11 of the back-side polarizing plate for light of wavelengths other than red and the reference line 7 are ξ1 = 110 ° and ξ2 =
It was set at 20 °.

A reflection plate 16 is attached to the outer surface of the back side polarizing plate 5 of the color liquid crystal display panel having the above-described structure, and (1/20)
0)-(1/240) duty, (1/14)-
The voltage was driven with a (1/17) bias, and each gradation was controlled by the frame rate control method. FIG. 12 is a CIE chromaticity diagram showing a color change of colored light when a voltage is applied. Conventional color liquid crystal display panel (Japanese Patent Laid-Open No. 6-3084)
81), the CIE chromaticity coordinates (x, y) are white (0.36, 0.29) and red (0.46, 0.39).
However, according to FIG. 12, by adopting the panel configuration of the present embodiment, the CIE chromaticity coordinates (x,
y) is (0.35, 0.31), closer to the D65 white light source (0.3127, 0.3291) than the conventional panel, and the red (0.58, 0.28) and red color purity is better. Has become. This is because the use of the polarizing plate having no red-polarizing ability shown in the present example allows the liquid crystal layer to have the same light intensity without converting the incident red wavelength light into linearly polarized light when a halftone voltage is applied. Since the light is emitted under the effect of the birefringence of, the purity of the red color can be increased in the display. Further, when a voltage is further applied and the liquid crystal molecules rise substantially vertically, light is blocked by the polarizing plate on the emission side, and black display is performed. With the panel configuration of this embodiment, a color liquid crystal display panel capable of displaying black and red having high color purity can be provided without a color filter.

In the present embodiment, the liquid crystal cell 6 has a liquid crystal molecule 4 with a twist angle of approximately 250 °, and Δn of the liquid crystal layer.
_LC · d _LC = 1.0 μm, and two uniaxially stretched retarder 1
2 and 13 are arranged between the liquid crystal cell 6 and the front-side polarizing plate 1, and Δnd _F1 = 0.472 μm, Δnd _F2 = 0.333.
The liquid crystal cell 6 may have the liquid crystal molecules 4 twisted at a twist angle of 200 ° to 260 °.
The Δn _LC · d _LC of the liquid crystal layer may be 0.6 μm to 1.8 μm, and the uniaxially stretched retardation plates 12 and 13 may be arranged between the two polarizing plates 1 and 5 at least two. , Δn _F
There is no limit on d _F.

Further, in the present embodiment, the reflection type is made by attaching the reflection plate 16 to the outside of the back side polarizing plate 5, but it may be the transmission type in which a backlight is installed in the color liquid crystal display panel.

By using the same three-dimensional refractive index control product as in Example 2 for the uniaxially stretched retardation plates 12 and 13,
It may be a color liquid crystal display panel having a wide viewing angle.

[0058]

EFFECTS OF THE INVENTION The color liquid crystal display device of the present invention does not use a color filter like the conventional color liquid crystal display device, but has a birefringence of only the liquid crystal layer or a birefringence of the uniaxially stretched retardation plate and the liquid crystal layer. The light is colored by the polarizing plate, and a high transmittance is obtained, and the cost is reduced. Further, since the color of the colored light can be changed by controlling the voltage applied to the liquid crystal cell, it is possible to display a plurality of colors.

In the color liquid crystal display device of the first invention of the present invention, liquid crystal molecules are twist-aligned at a twist angle of 100 ° to 170 °, and Δn _LC · d _LC of the liquid crystal layer is 1.
By setting the thickness to 0 μm to 1.6 μm, it is possible to provide a color liquid crystal display panel which is close to white when no voltage is applied and which has good color purity of red and blue at a low cost because there is no color filter. Further, in order to obtain a white display when no voltage is applied, the twist angle of the liquid crystal molecules is set to 150 ° ± 5 °, and the Δ of the liquid crystal layer is set.
It is desirable to set n _LC · d _LC to 1.40 μm ± 0.05 μm.

Further, the twist angle is as shallow as 100 ° to 170 °, the alignment of liquid crystal molecules is easy to stabilize, and it is suitable for low duty. Further, the color purity can be improved by setting the deviation angle between the transmission axis of the polarizing plate and the alignment direction of the liquid crystal molecules of the substrates adjacent to each polarizing plate to be 45 ° ± 5 °.

In the color liquid crystal display device according to the second aspect of the present invention, liquid crystal molecules are twist-aligned at a twist angle of 200 ° to 260 °, and Δn _LC · d _LC of the liquid crystal layer is 1.
0 μm to 1.8 μm, and at least one retardation plate has a product Δn of refractive index anisotropy Δn _{F of the} retardation plate and plate thickness d _F.
The sum of Δn _F · d _F of each of the two or more retardation plates with _F · d _F of 1.0 μm or more is Δn _LC · d _{LC of the} liquid crystal cell.
By setting the range of 1.0 times to 1.5 times, it is possible to obtain a display close to white when an off voltage is applied, and there are many colors.
A color liquid crystal display panel with good color purity can be provided at low cost because there is no color filter.

According to a more preferred structure, the twist angle of the liquid crystal molecules is set to 230 ° to 260 °, and Δn _{LC of} the liquid crystal layer is set.
· The d _LC and 1.60 .mu.m ± 0.05 .mu.m, the product [Delta] n _F · d _F of one of the phase difference plate and the refractive index anisotropy [Delta] n _F and the plate thickness d _F of the retardation plate is 1.3 .mu.m ± The off-voltage is applied by setting the sum of Δn _F · d _F of each of the two retardation plates to be 0.05 to 1.2 times the Δn _LC · d _LC of the liquid crystal cell. It is possible to provide a color liquid crystal display panel that can obtain a whiter display at times, increase color purity, increase the number of colors, suppress in-plane unevenness of retardation, and reduce costs.

According to a more preferred structure, the twist angle of the liquid crystal molecules is set to 230 ° to 260 °, and Δn _{LC of} the liquid crystal layer is set.
· The d _LC and 1.50 .mu.m ± 0.05 .mu.m, the product [Delta] n _F · d _F of the one from the refractive index anisotropy [Delta] n _F and the plate thickness d _F of the retardation plate of the retardation plate 1.4 [mu] m ± When the total of Δn _F · d _F of each of the two retardation films is 0.05 μm and is 1.1 to 1.3 times the Δn _LC · d _LC of the liquid crystal cell, the off voltage is applied. It is possible to provide a color liquid crystal display panel that can obtain a whiter display at times, increase color purity, increase the number of colors, suppress in-plane unevenness of retardation, and reduce costs.

Next, according to the third color liquid crystal display device of the present invention, liquid crystal molecules are twist-aligned at a twist angle of 200 ° to 260 °, and Δn _LC · d _LC of the liquid crystal layer is 0.6.
A color liquid crystal display panel capable of displaying black and red with high color purity can be provided without a color filter by setting the thickness from μm to 1.8 μm and disposing two or more uniaxially stretched retardation plates between two polarizing plates. .

Further, by making the uniaxially stretched retardation plate used in the color liquid crystal display panel of the present invention a three-dimensional refractive index controlled product, the viewing angle dependence of the panel can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a color liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a liquid crystal molecule alignment direction of a liquid crystal cell and a transmission axis of a pair of polarizing plates in a color liquid crystal display device of Example 1 of the present invention.

FIG. 3 is a plan view showing a color change of colored light in the color liquid crystal display device according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a color liquid crystal display device according to a second embodiment of the present invention.

FIG. 5 is a plan view showing a liquid crystal molecule alignment direction of a liquid crystal cell, a slow axis of two uniaxially stretched retardation plates, and a transmission axis of a pair of polarizing plates in a color liquid crystal display device of Example 2 of the present invention.

FIG. 6 is a plan view showing a color change of colored light in a color liquid crystal display device according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a color liquid crystal display device according to a third embodiment of the present invention.

FIG. 8 is a plan view showing a liquid crystal molecule alignment direction of a liquid crystal cell, a slow axis of two uniaxially stretched retardation plates, and a transmission axis of a pair of polarizing plates in a color liquid crystal display device of Example 3 of the present invention.

FIG. 9 is a plan view showing a color change of colored light in a color liquid crystal display device according to a third embodiment of the present invention.

FIG. 10 is a sectional view of a color liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 11 is a plan view showing a liquid crystal molecule alignment direction of a liquid crystal cell, a slow axis of two uniaxially stretched retardation plates, and a transmission axis of two polarizing plates in a color liquid crystal display device of Example 4 of the present invention.

FIG. 12 is a plan view showing a color change of colored light in a color liquid crystal display device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 front side polarizing plate 2 transparent substrate 3 transparent electrode 4 liquid crystal molecule 5 back side polarizing plate 6 liquid crystal cell 7 reference line 8 transmission axis of front side polarizing plate 9 orientation direction of liquid crystal molecules of front side transparent substrate 10 liquid crystal of back side transparent substrate Molecular orientation direction 11 Transmission axis of back side polarizing plate 12 Phase difference plate 1 13 Phase difference plate 2 14 Slow axis of phase difference plate 1 15 Slow axis of phase difference plate 2 16 Reflection plate

Claims (10)

[Claims] 1. A liquid crystal is sandwiched between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces thereof, and molecules of the liquid crystal are twist-aligned in the range of 100 ° to 170 ° between the upper and lower electrode substrates, The product Δn _LC · d _LC of the optical anisotropy Δn _LC of the liquid crystal and the liquid crystal layer thickness d _LC (μm) of the liquid crystal is 1.0 μm to 1.6
A liquid crystal cell having a range of μm and two polarizing plates arranged with the liquid crystal cell sandwiched therebetween, and the transmission axis of the polarizing plate with respect to the liquid crystal molecule alignment direction on the polarizing plate adjacent substrate side of the liquid crystal cell. A color liquid crystal display panel characterized by being slanted by 45 ° ± 5 °. 2. On two sheets having transparent electrodes formed on opposite surfaces
A liquid crystal is sandwiched between the lower electrode substrates and the molecules of the liquid crystal are vertically charged.
The liquid crystal is aligned by twisting 150 ° ± 5 ° between polar substrates.
Optical anisotropy Δn_LCAnd the liquid crystal layer thickness d of the liquid crystal_LC(Μm) and
Product of Δn_LC・ D _LCLiquid with a thickness of 1.4 μm ± 0.05 μm
Crystal cell and two polarized lights sandwiching the liquid crystal cell
A plate, and the transmission axis of the polarizing plate is set to the polarization axis of the liquid crystal cell.
45 with respect to the alignment direction of liquid crystal molecules on the side of the optical plate adjacent substrate
The color liquid crystal table according to claim 1, wherein the color liquid crystal table is slanted by ± 5 °.
Show panel. 3. A liquid crystal is sandwiched between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces thereof, and molecules of the liquid crystal are twist-aligned between the upper and lower electrode substrates in a range of 200 ° to 260 °. The product Δn _LC · d _LC of the optical anisotropy Δn _LC of the liquid crystal and the liquid crystal layer thickness d _LC (μm) of the liquid crystal is 1.0 μm to 1.8.
a liquid crystal cell having a range of μm, two polarizing plates arranged so as to sandwich the liquid crystal cell, and two or more retardation plates arranged between the liquid crystal cell and at least one polarizing plate. becomes, at least one of the phase difference plate, the product Δn _F · d _F of the refractive index anisotropy [Delta] n _F and the plate thickness d _F of the retardation plate at 1.0μm or more and the above two The sum of Δn _F · d _F of each retardation plate is Δn _LC · d of the liquid crystal cell.
A color liquid crystal display panel having a range of 1.0 to 1.5 times _LC . 4. A liquid crystal is sandwiched between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces, and molecules of the liquid crystal are twisted in the range of 230 ° to 260 ° between the upper and lower electrode substrates, The product Δn _LC · d _LC of the optical anisotropy Δn _LC of the liquid crystal and the liquid crystal layer thickness d _LC (μm) of the liquid crystal is 1.6 μm ± 0.0.
A liquid crystal cell of 5 μm, two polarizing plates arranged with the liquid crystal cell sandwiched therebetween, and two retardation plates arranged between the liquid crystal cell and the polarizing plate on the front side. in one the product Δn _F · d _F is 1.3 .mu.m ± 0.05 .mu.m and the refractive index anisotropy [Delta] n _F and the plate thickness d _F of the retardation plate of the retarder,
The color according to claim 3, wherein the sum of Δn _F · d _F of each of the two retardation plates is in the range of 1.0 to 1.2 times the Δn _LC · d _LC of the liquid crystal cell. Liquid crystal display panel. 5. A liquid crystal is sandwiched between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces, and molecules of the liquid crystal are twist-aligned in a range of 230 ° to 260 ° between the upper and lower electrode substrates, The product Δn _LC · d _LC of the optical anisotropy Δn _LC of the liquid crystal and the liquid crystal layer thickness d _LC (μm) of the liquid crystal is 1.5 μm ± 0.0.
A liquid crystal cell having a size of 5 μm, two polarizing plates arranged with the liquid crystal cell sandwiched therebetween, and two units arranged one by one between the liquid crystal cell and each of the front and back side polarizing plates. consists of a retardation plate, one of the phase difference plate product Δn _F · d _F of the refractive index anisotropy [Delta] n _F and the plate thickness d _F of the retardation plate is 1.4 [mu] m ±
The sum of Δn _F · d _F of each of the two retardation plates is 0.05 μm, and is 1.1 to 1.3 times the Δn _LC · d _LC of the liquid crystal cell. The color liquid crystal display panel according to item 3. 6. A liquid crystal is sandwiched between two upper and lower electrode substrates having transparent electrodes formed on opposite surfaces thereof, and molecules of the liquid crystal are twist-aligned in the range of 200 ° to 260 ° between the upper and lower electrode substrates, The product Δn _LC · d _LC of the optical anisotropy Δn _LC of the liquid crystal and the liquid crystal layer thickness d _LC (μm) of the liquid crystal is 0.6 μm to 1.8.
a liquid crystal cell having a range of μm, a polarizing plate disposed on the front surface side across the liquid crystal cell and having a polarizing ability over the entire visible light, and a polarizing plate disposed on the back surface side having no red polarizing ability, A color liquid crystal display panel comprising two or more retardation plates arranged between the liquid crystal cell and at least one polarizing plate. 7. The color liquid crystal display panel according to claim 1, wherein a reflective plate is provided outside the polarizing plate disposed on the back surface side. 8. The method according to claim 3, wherein the transmission axis of the polarizing plate on the light incident side is slanted by 45 ° ± 5 ° with respect to the alignment direction of the liquid crystal molecules on the polarizing plate adjacent substrate side of the liquid crystal cell. A color liquid crystal display panel as described in. 9. A reflective plate is provided outside a polarizing plate disposed on the back surface side, and a transmission axis of the polarizing plate adjacent to the reflective plate is aligned with a liquid crystal molecule on the polarizing plate adjacent substrate side of a liquid crystal cell. The color liquid crystal display panel according to any one of claims 3 to 7, wherein the color liquid crystal display panel is slanted by 45 ° ± 5 ° with respect to the direction. 10. The color liquid crystal display panel according to claim 3, wherein a three-dimensional refractive index control means is used for the retardation plate arranged between the liquid crystal cell and at least one polarizing plate.