JPH06317790A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To make the brightness of display very high by coloring transmitted light without using a color filter and making the transmissivity of the light high. CONSTITUTION:This device is provided with a ferroelectric liquid crystal cell 30 obtained by sealing ferroelectric liquid crystal 38 between a pair of transparent substrates 31 and 32 on which transference electrodes 33 and 34 are formed, a phase difference plate 40, a polarizing plate 41 and a reflector 42. The polarizing plate 41 is arranged on the front surface side of the cell 30, the reflector 42 is arranged on the back surface side of the cell 30, the plate 40 is arranged between the cell 30 and the polarizing plate 41, then the lag axis of the plate 40 and the transmission axis of the polarizing plate 41 are obliquely deviated.

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 device.

[0002]

2. Description of the Related Art As a liquid crystal display device, there is a color liquid crystal display device which can obtain a colored display. FIG. 3 is a cross-sectional view of a conventional color liquid crystal display device. This liquid crystal display device includes a liquid crystal cell 10 having a color filter and a liquid crystal cell 1.
It is composed of a pair of polarizing plates 21 and 22 which are arranged with 0 interposed therebetween.

The liquid crystal cell 10 has transparent electrodes 13 and 14
And a pair of upper and lower transparent substrates 11 and 12 on which the alignment films 15 and 16 are formed are bonded to each other via a frame-shaped sealing material 18, and are surrounded by the sealing material 18 between the two substrates 11 and 12. A liquid crystal 19 is sealed in a closed region. One substrate of the liquid crystal cell 10, for example, the lower substrate 12 in the figure,
A color filter 17 for coloring the transmitted light is provided.

The color filter 17 is provided on the substrate 12
The transparent electrode 14 on the substrate 12 side is formed on a protective film (not shown) that covers the color filter 17. Further, as the liquid crystal cell 10,
In general, the liquid crystal molecules between the substrates 11 and 12 are almost 9
A TN (twisted nematic) type having a twist orientation at a twist angle of 0 ° is used.

The pair of polarizing plates 21 and 22 are arranged such that their transmission axes are substantially parallel to each other, and the transmission axes of these polarizing plates 21 and 22 are liquid crystal on one substrate side of the liquid crystal cell 10. It is almost parallel to the molecular orientation direction.

There are two types of liquid crystal display devices, a transmissive type and a reflective type in which a reflecting plate is arranged on the back surface.
A color liquid crystal display device equipped with a color filter is generally
It is of a transmissive type as shown in FIG.

In the color liquid crystal display device, a light source (not shown) is arranged on the back surface side thereof, and both substrates 1 of the liquid crystal cell 10 are arranged.
The display is driven by applying a voltage between the electrodes 13 and 14 of Nos. 1 and 12, and the light from the light source is linearly polarized by the polarizing plate 22 on the incident side (the lower side in FIG. 3) to the liquid crystal cell 10. Incident.

The linearly polarized light that has entered the liquid crystal cell 10 passes through the color filter 17 and the liquid crystal layer, and the liquid crystal cell 1
0 is emitted, but in that case, light having a wavelength other than the wavelength band corresponding to the color of the color filter 17 is absorbed by the color filter 17, so that the light emitted from the liquid crystal cell 10 is colored in the color of the color filter 17. Become light.

Further, when no voltage is applied between the electrodes 13 and 14 of the liquid crystal cell 10, that is, when the liquid crystal molecules are twist-aligned, the light passing through the liquid crystal cell 10 is the liquid crystal 1.
The linearly polarized light that has been emitted from the liquid crystal cell 10 at this time is linearly polarized in a direction substantially orthogonal to the linearly polarized light that has entered the liquid crystal cell 10 when it has finished passing through the liquid crystal layer due to the polarization effect of 9. It is absorbed by the polarizing plate 21 (upper side in FIG. 3), and the display is in a dark (black) state.

On the other hand, when a voltage is applied between the electrodes 13 and 14 of the liquid crystal cell 10, the liquid crystal molecules are vertically aligned with respect to the surfaces of the substrates 11 and 12, and the polarization effect of the liquid crystal 19 is almost eliminated. The linearly polarized light entering 10 exits the liquid crystal cell 10 as it is. Then, at this time, the linearly polarized light emitted from the liquid crystal cell 10 is transmitted through the emission side polarization plate 21, and the display becomes a bright display of the color colored by the color filter 17.

[0011]

However, since the above-mentioned conventional color liquid crystal display device colors the transmitted light by using the color filter 17, it has a problem that the light transmittance is low and therefore the display is dark. There is.

This is due to the absorption of light by the color filter 17. Since the color filter 17 also absorbs light in the wavelength band corresponding to the color with a considerably high absorption rate, coloring through the color filter 17 is performed. The light becomes light in which the amount of light is significantly reduced compared to the light in the wavelength band before entering the color filter 17, and the display becomes dark.

Although the color liquid crystal display device shown in FIG. 3 is of a transmissive type, if a reflection plate is arranged on the back surface of this color liquid crystal display device to form a reflection type device, light is incident from the front side of the device. Since the light reflected by the reflecting plate on the back surface and emitted to the front surface side passes through the color filter 17 twice and the light amount is doubly reduced, the display is considerably darkened and becomes almost unusable as a display device.

It is an object of the present invention to provide a color liquid crystal display device capable of coloring transmitted light without using a color filter to increase the light transmittance and sufficiently increase the display brightness. It is a thing.

[0015]

A color liquid crystal display device of the present invention comprises a ferroelectric liquid crystal cell in which a ferroelectric liquid crystal is sealed between a pair of transparent substrates having transparent electrodes formed thereon, and one retardation plate. One polarizing plate and a reflecting plate are provided, the polarizing plate is arranged on the front surface side of the liquid crystal cell, the reflecting plate is arranged on the rear surface side of the liquid crystal cell, and the polarizing plate and the reflecting plate are combined. The retardation plate is disposed between any one of the liquid crystal cells and the liquid crystal cell, and the transmission axis of the polarizing plate is slanted by a predetermined angle with respect to the slow axis of the retardation plate. It is a thing. In the present invention, the deviation angle between the transmission axis of the polarizing plate and the slow axis of the retardation plate is preferably about 45 °.

[0016]

This color liquid crystal display device is of a reflection type in which light incident from the front surface side is reflected by the reflection plate on the back surface side for display, and the incident light from the front surface side is a polarizing plate and a retardation plate. Then, the light passes through the liquid crystal cell, is reflected by the reflection plate, and is emitted again through the liquid crystal cell, the retardation plate and the polarizing plate.

In this color liquid crystal display device, linearly polarized light that has entered through the polarizing plate has a retardation plate in which the slow axis is slanted at a predetermined angle with respect to the transmission axis of the polarizing plate, and the liquid crystal. The polarization state can be changed by these polarization effects in the process of passing through the cell, and the polarization state can be further changed in the process of passing through the liquid crystal cell and the retardation plate again by being reflected by the reflection plate. The light that enters the polarizing plate again through the cell is non-linearly polarized light that has been subjected to the polarization effect by the retardation plate and the liquid crystal cell twice.
Therefore, of this light, only the light of the wavelength of the polarization component that passes through the polarizing plate passes through the polarizing plate and is emitted, and the emitted light becomes colored light.

In this case, the polarization effect of the retardation plate does not change, but the liquid crystal cell has two stable states (bistability) in the alignment state of the liquid crystal molecules, and the liquid crystal molecules have different stable states depending on the polarity of the applied voltage. Since the liquid crystal cell is a ferroelectric liquid crystal cell using a ferroelectric liquid crystal in which the alignment state changes between the first stable state and the second stable state, this liquid crystal cell aligns the liquid crystal in the first stable state. A different polarization action is shown depending on time and when oriented in the second stable state.

Therefore, the phase difference plate and the liquid crystal cell
The light that has been polarized by each degree becomes a light having a different polarization state depending on the alignment state of the liquid crystal molecules of the liquid crystal cell and enters the polarizing plate. Therefore, by changing the polarity of the voltage applied to the liquid crystal cell, The color of the colored light that is transmitted and emitted can be changed.

That is, this color liquid crystal display device colors the transmitted light without using a color filter like the conventional liquid crystal display device, and therefore the amount of the colored light is equal to that of the light incident on the display device. Since it is almost the same as the amount of light in the wavelength band that becomes the colored light, it is possible to increase the light transmittance and sufficiently increase the brightness of the display.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a color liquid crystal display device. This color liquid crystal display device includes one ferroelectric liquid crystal cell 30, one retardation plate 40, and one polarizing plate 4.
1 and one reflection plate 42, the polarizing plate 41 is disposed on the front surface (upper surface in the drawing) side of the liquid crystal cell 30, and the reflection plate 42 is the back surface (lower surface in the drawing) of the liquid crystal cell 30. And the retardation plate 40 is disposed between the liquid crystal cell 30 and the polarizing plate 41. The retardation plate 40 is adhered to the outer surface of the front side substrate (upper substrate in the figure) 31 of the liquid crystal cell 30, and the reflection plate 42 is the liquid crystal cell 3.
0 is attached to the outer surface of the back side substrate (lower substrate in the figure) 32, and the polarizing plate 41 is attached to the surface of the retardation plate 40.

The ferroelectric liquid crystal cell 30 has a transparent electrode 3
A pair of upper and lower transparent substrates 31 and 32, on which the alignment films 35 and 36 are formed, are bonded to each other via a frame-shaped sealing material 37, and the sealing material 37 between the substrates 31 and 32 is joined. Ferroelectric liquid crystal 38 having a smectic layer structure is enclosed in a region surrounded by, and alignment films 35 and 36 on both substrates 31 and 32 regulate the direction of the normal line of the smectic layer structure. Orientation treatment has been performed.

The ferroelectric liquid crystal 38 has two stable states (bistability) in the alignment state of its molecules, and the alignment states of the liquid crystal molecules are the first stable state and the second stable state depending on the polarity of the applied voltage. Changes to a stable state of.

That is, both substrates 31, 3 of the liquid crystal cell 30.
When a voltage having one polarity and an absolute value which is equal to or higher than the threshold voltage of the liquid crystal 38 is applied between the two electrodes 33 and 34, liquid crystal molecules are regulated by the alignment films 35 and 36, and the normal direction of the smectic layer structure. First tilted almost uniformly in one direction with respect to
Is aligned in a stable state, and the alignment state is maintained even after the voltage application is stopped. Further, when a voltage having an opposite polarity and an absolute value equal to or higher than the threshold voltage of the liquid crystal 38 is applied between the electrodes 33 and 34, the liquid crystal molecules are substantially uniform in the opposite direction to the normal direction of the smectic layer structure. It is oriented in the second stable state inclining to, and the oriented state is maintained even after the voltage application is stopped.

In the liquid crystal cell 30, when the ferroelectric liquid crystal 38 is aligned in one of the stable states of the first and second stable states, the liquid crystal molecule alignment direction is transmitted by the polarizing plate 41. The retardation plate 40 is arranged so as to be parallel to the axis, and the retardation plate 40 is arranged such that its slow axis is slanted by a predetermined angle with respect to the transmission axis of the polarizing plate 41.

FIG. 2 shows the alignment directions of the two liquid crystal molecules of the ferroelectric liquid crystal cell 30, the slow axis of the retardation plate 40 and the polarizing plate 4.
It is a top view which shows the transmission axis of 1. In FIG. 2, 30
a and 30b are liquid crystal molecule alignment directions of the liquid crystal cell 30,
Reference numeral 30a is the liquid crystal molecule alignment direction in the first stable state, and 30b is the liquid crystal molecule alignment direction in the second stable state.

These two liquid crystal molecule orientation directions 30a, 30
The angle formed by b is the sum of the tilt angle of the first liquid crystal molecule alignment direction 30a and the tilt angle of the second liquid crystal molecule alignment direction 30b with respect to the normal direction of the smectic layer structure. Is θ, the angle formed by these orientation directions 30a and 30b is 2θ. Then, in this embodiment, the material of the ferroelectric liquid crystal 38 is selected so that the angle 2θ becomes 45 °.

Further, in FIG. 2, reference numeral 40a is a phase difference plate 4
The slow axis of 0, 41a is the transmission axis of the polarizing plate 41, and in this embodiment, when the transmission axis 41a of the polarizing plate 41 and the ferroelectric liquid crystal 38 of the liquid crystal cell 30 are aligned in the first stable state. The liquid crystal molecule alignment direction 30a of
The deviation angle φ between the transmission axis 41a of the above and the slow axis 40a of the retardation plate 40 is 45 °. In this embodiment, as described above, the two liquid crystal molecule alignment directions 3 of the liquid crystal cell 30 are used.
Since the angle 2θ formed by 0a and 30b is 45 °,
The slow axis 40a of the retardation plate 40 is parallel to the liquid crystal molecule alignment direction 30b when the ferroelectric liquid crystal 38 of the liquid crystal cell 30 is aligned in the second stable state.

This color liquid crystal display device is of a reflection type in which light (natural light or light from an illumination light source) incident from the front surface side is reflected by the reflection plate 42 on the rear surface side and displayed. Incident light is generated by the polarizing plate 41 and the retardation plate 40.
After passing through the liquid crystal cell 30, the light is reflected by the reflection plate 42, and again passes through the liquid crystal cell 30, the retardation plate 40, and the polarizing plate 42 to be emitted. Further, this color liquid crystal display device has a liquid crystal cell 3
A display is driven by applying a voltage between the electrodes 33 and 34 of both substrates 31 and 32 of 0.

In this color liquid crystal display device, the linearly polarized light that has entered through the polarizing plate 41 has a slow axis 40a at a predetermined angle (φ = φ in this embodiment) with respect to the transmission axis 41a of the polarizing plate 41. 45 °) The liquid crystal cell 30 and the liquid crystal cell 30 can be changed in polarization state while passing through the retardation plate 40 and the liquid crystal cell 30 which are obliquely displaced, and the liquid crystal cell 30 and the retardation plate are reflected again by the reflection plate 42. The polarization state can be further changed in the process of passing through 41.

Therefore, the retardation plate 40 and the liquid crystal cell 3 are
The light that passes through 0 and enters the polarizing plate 41 again is the phase difference plate 4
0 and the liquid crystal cell 30 are non-linearly polarized light that has been subjected to a polarization effect of 2 degrees each.
Only the wavelength light of the polarization component that transmits 1 is transmitted through the polarizing plate 41 and emitted, and the emitted light becomes colored light.

In this case, the polarization action of the retardation plate 40 does not change, but the liquid crystal cell 30 has two stable states of the alignment state of the liquid crystal molecules, and the alignment state of the liquid crystal molecules depends on the polarity of the applied voltage. Since this is a ferroelectric liquid crystal cell using the ferroelectric liquid crystal 38 that changes between the first stable state and the second stable state, this liquid crystal cell 30 has the liquid crystal 38 oriented in the first stable state. A different polarization action is shown depending on time and when oriented in the second stable state.

That is, the ferroelectric liquid crystal cell 30 is
In the state in which the liquid crystal molecules are aligned in the first stable state and the state in which the liquid crystal molecules are aligned in the second stable state, a phase difference having a slow axis in the alignment directions 30a and 30b of the liquid crystal molecules, respectively. It can be thought of as a plate, and therefore this liquid crystal cell 30
Shows a polarization effect similar to that of a retardation plate having a slow axis in this direction when the liquid crystal 38 is oriented in the first stable state, and when the liquid crystal 38 is oriented in the second stable state. , Shows a polarization effect similar to a retardation plate having a slow axis in this direction.

For this reason, the light that has been polarized by the retardation plate 40 and the liquid crystal cell 30 twice each, is reflected by the liquid crystal cell 30.
The light having different polarization states depending on the liquid crystal molecule alignment state is incident on the polarizing plate 41. Therefore, by changing the polarity of the voltage applied to the liquid crystal cell 30, the color of the colored light transmitted through the polarizing plate 41 and emitted is changed. Can be changed.

As described above, the color liquid crystal display device has
Unlike conventional liquid crystal display devices, the transmitted light is colored without using a color filter. Therefore, the amount of colored light is the amount of light in the wavelength band that becomes the colored light of the light that enters the display device. Since it is almost the same as the above, it is possible to increase the light transmittance and sufficiently increase the display brightness.

That is, in the conventional color liquid crystal display device, the amount of colored light passing through the color filter is considerably reduced as compared with the amount of light in the wavelength band which becomes colored light in the light incident on the display device. In the color liquid crystal display device,
Such a decrease in light amount hardly occurs. For this reason,
The color liquid crystal display device is of a reflective type, but its display brightness is sufficient.

The brightness of the display in the color liquid crystal display device will be described. When a voltage of one polarity is applied to the liquid crystal cell 30 to orient the liquid crystal 38 in the first stable state, that is, the liquid crystal molecules are polarized. The intensity I of the uncolored light emitted from the display device when oriented in the direction 30a which is parallel to the transmission axis 41a of the plate 41 and diagonally intersects the slow axis 40a of the retardation plate 40 is: Transmission axis 4 of polarizing plate 41
The deviation angle φ between 1a and the slow axis 40a of the retardation plate 40 is φ =
45 ° (φ = π / 4), deviation angle −4 between the slow axis 40a of the retardation plate 40 and the liquid crystal molecule alignment direction 30a of the liquid crystal cell −4
If it is 5 ° (−π / 4), it is expressed by the following equation (1).

[0038]

[Equation 1]

When a voltage of opposite polarity is applied to the liquid crystal cell 30 to orient the liquid crystal 38 in the second stable state,
That is, when the liquid crystal molecules cross the transmission axis 41a of the polarizing plate 41 at an angle and are aligned in the direction 30b parallel to the slow axis 40a of the retardation plate 40, the colored light emitted from the display device is emitted. The intensity I is the slow axis 4 of the retardation plate 40 at this time.
The deviation angle between 0a and the liquid crystal molecule alignment direction 30a of the liquid crystal cell 30 is 0 ° (the deviation angle φ between the transmission axis 41a of the polarizing plate 41 and the slow axis 40a of the retardation plate 40 is φ = 45 °). ,
It is expressed by the following equation (2).

[0040]

[Equation 2]

[0041] Incidentally, (1) and (2) the retardation Re ₁ of the retardation plate 40 in the expression, the product [Delta] n ₁ · d ₁ of the refractive index of the retardation film anisotropy [Delta] n ₁ and a thickness d ₁ The value is determined by the retardation Re _{2 of the} liquid crystal cell 30.
Is the product Δ of refractive index anisotropy Δn ₂ of liquid crystal and liquid crystal layer thickness d _2.
It is a value determined by n ₂ · d ₂ .

The value of the light intensity I obtained by the above equations (1) and (2) is the amount of light absorbed by the polarizing plate 41 rather than the intensity of all wavelength light (visible light) entering the display device. Although low, in the color liquid crystal display device, most of the wavelength light of the polarization component that passes through the polarizing plate 41 is emitted without being absorbed by the polarizing plate 41, and thus the brightness of the emitted light is sufficiently high.
Therefore, as compared with the conventional color liquid crystal display device using the color filter, a much brighter colored display can be obtained.

Next, the display color of the color liquid crystal display device will be described. With respect to the display color of the color liquid crystal display device, as described above, the voltage of one polarity is applied to the liquid crystal cell 30 so that the liquid crystal 38 becomes the first color. 1 when the liquid crystal cell 30 is aligned in the stable state and when the liquid crystal cell 30 is aligned in the second stable state by applying a voltage of opposite polarity to the liquid crystal cell 30. The retardation Re ₁ , the retardation Re ₂ of the liquid crystal cell 30, the shift angle φ between the transmission axis 41a of the polarizing plate 41 and the slow axis 40a of the retardation plate 40,
Two liquid crystal molecule orientation directions 30a and 30b of the liquid crystal cell 30
And the angle between the slow axis 40a of the retardation plate 40 and the angle.

The following [Table 1] shows the transmission axis 41 of the polarizing plate 41.
a and the slow axis 40a of the retardation plate 40, the deviation angle φ is φ = 4
5 °, the angle between the first liquid crystal molecule alignment direction 30a of the liquid crystal cell 30 and the slow axis 40a of the retardation plate 40 is 45 °, the second liquid crystal molecule alignment direction 30b and the slow axis 40a of the retardation plate 40
The display color of the color liquid crystal display device in which the values of retardation Re ₁ and Re ₂ of the retardation plate 40 and the liquid crystal cell 30 are changed is shown with the angle of 0 ° (parallel) set to 0 °. In Table 1, -E and + E are applied voltages to the liquid crystal cell 30, and here, the liquid crystal molecule alignment state when a negative voltage -E is applied is defined as the first stable state, and The liquid crystal molecule alignment state when the voltage + E is applied is the second stable state.

[0045]

[Table 1]

As shown in [Table 1], the display color of the color liquid crystal display device differs depending on the values of the retardations Re ₁ and Re ₂ of the retardation plate 40 and the liquid crystal cell 30, and, for example, the retardation Re of the retardation plate 40. ₁ for Re ₁ = 225
nm, the retardation Re ₂ of the liquid crystal cell 30 is Re ₂ =
When 395 nm, a negative voltage −E is applied to the liquid crystal cell 30.
Is applied to orient the liquid crystal 38 in the first stable state, the display color becomes “blue”, and the positive voltage + E is applied to the liquid crystal cell 30.
Is applied to orient the liquid crystal 38 in the second stable state, the display color becomes “red”.

Further, the color liquid crystal display device has four elements, one ferroelectric liquid crystal cell 30, one retardation plate 40, one polarizing plate 41 and one reflecting plate 42. Since it is configured only by itself, the configuration is simple and can be obtained at low cost.

Although the retardation plate 40 is disposed between the liquid crystal cell 30 and the polarizing plate 41 in the above embodiment, the retardation plate 40 is disposed between the liquid crystal cell 30 and the reflection plate 42. Good.

In the above embodiment, the shift angle φ between the transmission axis 41a of the polarizing plate 41 and the slow axis 40a of the retardation plate 40 is φ = 45 °, but this shift angle φ is 45 °. It is not limited and can be arbitrarily selected. However, in order to sufficiently obtain the above-mentioned coloring effect, the shift angle φ is set to approximately 45 ° (for example, 4
5 ± 5 °) is desirable.

Further, in the above embodiment, of the two liquid crystal molecule alignment directions 30a and 30b of the liquid crystal cell 30, the liquid crystal molecule alignment direction 30a in the first stable state is the polarizing plate 41.
The liquid crystal molecule alignment direction 30b in the second stable state is set to be parallel to the transmission axis 41a of the liquid crystal molecule and the slow axis 40a of the retardation plate 40.
The directions of a and 30b may be arbitrary, and the angle formed by the liquid crystal molecule alignment directions 30a and 30b is not limited to 45 °.

[0051]

According to the color liquid crystal display device of the present invention, a ferroelectric liquid crystal cell in which a ferroelectric liquid crystal is sealed between a pair of transparent substrates having transparent electrodes, one retardation plate, and one retardation plate. A polarizing plate and a reflecting plate are provided, the polarizing plate is arranged on the front surface side of the liquid crystal cell, the reflecting plate is arranged on the back surface side of the liquid crystal cell, and either the polarizing plate or the reflecting plate and the liquid crystal are arranged. The retardation plate is arranged between the cell, and,
Since the transmission axis of the polarizing plate is slanted at a predetermined angle with respect to the slow axis of the retardation plate, the transmitted light is colored without using a color filter to increase the light transmittance and display. The brightness of can be made high enough.

[Brief description of drawings]

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

FIG. 2 shows a ferroelectric liquid crystal cell 2 according to an embodiment of the present invention.
FIG. 3 is a plan view showing two alignment directions of liquid crystal molecules, a slow axis of a retardation plate, and a transmission axis of a polarizing plate.

FIG. 3 is a sectional view of a conventional color liquid crystal display device.

[Explanation of symbols]

 30 ... Ferroelectric liquid crystal cell 30a ... Liquid crystal molecule alignment direction in first stable state 30b ... Liquid crystal molecule alignment direction in second stable state 31, 32 ... Transparent substrate 33, 34 ... Transparent electrode 35, 36 ... Alignment film 38 ... Ferroelectric liquid crystal 40 ... Retardation plate 40a ... Slow axis 41 ... Polarizing plate 41a ... Transmission axis 42 ... Reflector

Claims (2)

[Claims] 1. A ferroelectric liquid crystal cell in which a ferroelectric liquid crystal is sealed between a pair of transparent substrates having transparent electrodes, one retardation plate, one polarizing plate, and a reflecting plate. The polarizing plate is arranged on the front surface side of the liquid crystal cell, the reflecting plate is arranged on the rear surface side of the liquid crystal cell, and the retardation plate is provided between any one of the polarizing plate and the reflecting plate and the liquid crystal cell. And a transmission axis of the polarizing plate is slanted by a predetermined angle with respect to a slow axis of the retardation plate. 2. The color liquid crystal display device according to claim 1, wherein the deviation angle between the transmission axis of the polarizing plate and the slow axis of the retardation plate is approximately 45 °.