JP2002341334A - Color liquid crystal display - Google Patents

Abstract

(57) [Problem] To provide a bright reflective color liquid crystal display device with a white display, which is a new field sequential method. SOLUTION: The reflection type color liquid crystal display device 10 comprises a liquid crystal cell 12 controlled by a new field sequential system, and a reflection device 14 arranged on the back of the liquid crystal cell 12, and the reflection device 14 has Y. A strip-shaped reflection sheet 18 on which reflection regions 18Y, 18M, and 18C that reflect light of three colors of M and C are formed is arranged, and this is driven by a driving device 20, and the reflection regions 18Y, 18M, and
18C sequentially moves to the back side of the liquid crystal cell 12, and the liquid crystal cell 1
Reference numeral 2 indicates that the color filter controls three pixels of yellow, magenta, and cyan at the same time and three times in a time series in synchronization with the color change of the reflection area, and the light transmittance is controlled three times in a time series. As a result of the display, a target color is displayed by additive color mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new field sequential type color liquid crystal display device.

[0002]

2. Description of the Related Art In recent years, a color liquid crystal display device using a field sequential method has been proposed with the advantages of energy saving, cost reduction and improvement of resolution.

The principle of color liquid crystal display by the field sequential method is based on a liquid crystal display (hereinafter referred to as LCD).
Is used as an optical shutter, and is illuminated by a light source sequentially lit from the back of the LCD to switch the light source color at a high speed.

[0004]

However, as described above, such a field sequential type color liquid crystal display device needs to be illuminated by a light source which is lit sequentially from the back of the LCD, and power consumption by the light source is large. However, there is a problem that the method cannot be applied to a liquid crystal display device of a portable electronic device driven by a battery.

Further, a reflection type liquid crystal display device that does not use a light source, that is, does not consume power by the light source can be considered.

Normally, a color liquid crystal display element has R (red), G
(Green) and B (Blue) configuration micro color filter system, this micro color filter has a high light absorption rate, and external light is reflected by the reflector on the back of the liquid crystal cell through the micro color filter, When the light passes through the micro color filter again, it becomes 1/3 or less of the amount of incident light, and half of the light is absorbed by the polarizing plate.
The conventional reflective liquid crystal display device has a problem that it is difficult to form a bright image.

In particular, in the case of a reflection type liquid crystal display device, there is a problem that the white display is dark, for example, when characters are displayed as black, the reflectance of white background is low, so that the contrast is low and the display is difficult to see. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is directed to a reflection type color liquid crystal display device which uses a new field sequential system, reduces power consumption and brightens white display. The purpose is to provide.

[0009]

The inventor of the present invention has proposed a liquid crystal display device using Y (yellow), M (magenta), and C (cyan) color filters, and three YMC pixels at the same time. The transmissivity is controlled three times in a time series so that a desired color can be displayed. Further, a reflection sheet having a reflection region for each color is incorporated on the back side of the LCD. Thus, they have found that a new field-sequential reflective color liquid crystal display device can be configured by moving the display in synchronization with the switching of the display of the liquid crystal color.

According to the present invention, a picture element includes three pixels provided with yellow, magenta and cyan color filters, and the light transmittance of these three pixels is to be displayed for each picture element. Are controlled in a time series at least three times at the same time for three pixels per frame of
A liquid crystal cell that performs color display by additive color mixing of the first display, and a reflection device disposed at a position where light transmitted through the liquid crystal cell is incident. The reflection device includes the one frame of yellow, A reflection sheet having reflection areas of three colors adapted to reflect color lights corresponding to the colors of magenta and cyan; and sequentially synchronizing the reflection sheet with the three times of display in the pixels of the liquid crystal cell, A period in which the reflected light of yellow and the transmittance of the three pixels of yellow, magenta, and cyan of the liquid crystal cell are combined; a period in which the reflected light of magenta and the transmittance of three pixels of yellow, magenta, and cyan of the liquid crystal cell are combined; In three combinations of periods in which the reflected light of cyan and the transmittances of the three pixels of yellow, magenta, and cyan of the liquid crystal cell are combined, the incident light is sequentially moved to the position where it is selectively reflected toward the liquid crystal cell. The color liquid crystal display device characterized by having a drive unit for driving to, is to achieve the above object.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, a reflective color liquid crystal display device 10 according to an embodiment of the present invention has one picture element 13 (see FIG. 2) in which Y (yellow), M (magenta),
3 pixels 13 with C (cyan) color filter
A liquid crystal cell 12 of a new field sequential system composed of Y, 13M, and 13C, and a reflection device 14 disposed on the back surface of the liquid crystal cell 12 so that light transmitted through the liquid crystal cell 12 is incident. Have been.

The liquid crystal cell 12 performs a color display by a new field sequential (pixel sequential display) method proposed by the inventor of the present invention, that is, a color display by a method of temporally mixing colors by the control device 16. is there.

More specifically, one frame of a screen to be displayed is divided into three fields (images), and these fields are set at a high speed so that the light transmittance of three pixels of YMC is simultaneously and three pixels per field. Are sequentially switched to form one color image.

Therefore, although only an image of a color different from the intended one is displayed at the instant of time, if the repetition rate of the field is fast enough not to be recognized as flicker, the colors are mixed due to the afterimage phenomenon of the retina, Recognized as a color image.

The Y ·
The monochromatic light of M / C is formed by the reflection device 14, and each color light is sequentially reflected and formed in accordance with the switching timing of the three fields in the liquid crystal cell 12.

The reflecting device 14 has three reflecting areas 18Y, 18M, and 18Y so as to form reflected light of three colors of Y, M, and C.
Endless strip-shaped reflective sheet 1 painted 18C
8 (see FIG. 3), a pair of rolls 20A and 20B for winding and driving the reflection sheet 18, and a driving device 20 including a motor 20C for driving at least one of the rolls. Have been.

The motor 20C is controlled by the control device 16 so that the reflection areas 18Y, 18M, and 18C are sequentially positioned on the back surface of the liquid crystal cell 12 within the range of the field switching speed of the liquid crystal cell 12. You. Switching of the field of the liquid crystal cell 12 is performed by the reflection areas 18Y and 18Y.
It is controlled in synchronization with the switching speed of M and 18C.

The liquid crystal cell 12 is partially enlarged and shown in FIG.
2A, a transparent common electrode 12B, a black mask 12C formed between the outer peripheral portion of each pixel of the transparent common electrode and the display-side transparent substrate 12A, and an alignment film 12D.
, A liquid crystal layer 12E, and the liquid crystal layer 12E
An alignment film 12F on the opposite side sandwiched together with 2D;
2F, and a flattening film 12H that supports the pixel electrode 12G. The color filters 13y, 13m, and 13c include a transparent substrate 12A.
It is provided above.

The liquid crystal cell 12 is not limited to the structure shown in FIG. 4, but may be constituted by other known elements. The picture element 13 is composed of striped pixels 13Y, 13M, and 13C.
This may be a mosaic arrangement or a triangle arrangement.

The reflection sheet 18 in the reflection device 14
As shown in FIG. 5, a reflective layer 19 and colored layers 19Y and 19Y are formed on a base material 18A such as a resin film or a metal film.
M, 19C, the reflection areas 18Y, 18M, 18
C is formed, and as the base material 18A, a plastic film such as a polyethylene terephthalate (PET) film, a polyester film, a polycarbonate film, a polyacryl film, a polyolefin film, or a thin metal plate such as aluminum or copper is used. Although the thickness of the base material 18A is not particularly limited, it is 10 μm to 5 mm.
Is good.

If the thickness of the base material 18A is less than 10 μm, the abrasion resistance in continuous rotation (movement) is inferior, and if it is more than 5 mm, the rigidity becomes excessive and the rotation is not performed smoothly.

The reflection layer 19 formed on the substrate 18A
Is formed, for example, of a metal with high reflectivity such as aluminum or silver by a physical vapor deposition (PVD) method. The PVD method is appropriately selected from ordinary means for forming a metal thin film such as a vacuum evaporation method, a sputtering method, and an ion plating method. or,
The reflection layer 19 may be formed by laminating a plurality of layers. Here, if the thickness of the reflection layer 19 is about 50 nm to 100 nm, a sufficient reflectance can be obtained.

As shown in FIG. 5, colored layers 19Y, 19M and 19C are formed on the reflective layer 19 so as to reflect light of a predetermined color. The specific coloring method is the same as the conventional color filter coloring method, that is, means such as a dyeing method and a dispersion method is used.

In the case where the light reflecting layer is formed by PVD such as a vapor deposition method, to prevent the deterioration of the reflecting layer,
On the reflective layer 19 and the colored layers 19Y, 19M, 19C,
As shown by a two-dot chain line in FIG. 5, for example, acrylic resin, epoxy resin, polyester resin, urethane resin,
It is preferable to provide a protective layer 21 made of a coating film of alkyd resin or the like. This coating may be performed by roll coating, gravure coating, spray coating, or the like. Further, a thin film of an inorganic substance such as silicon oxide can be used as the protective layer.

The type of liquid crystal used for the liquid crystal layer 12E of the liquid crystal cell 12 is as follows, as described later.
It is necessary to set the speed to 3 ms or less, and it is preferable to use a high-speed switch transistor such as polysilicon for the TFT, and to use an OCB (Optically Compensated Birefringenc).
e) High-speed response liquid crystal such as liquid crystal, cholesteric liquid crystal and ferroelectric liquid crystal is preferable.

In the case of the field sequential display, the field period must be set to 17 ms (1/60 sec) or less in order to prevent the screen from flickering.
Since this is displayed in three times, each reflection area 18Y,
The display period of one of 18M and 18C needs to be set to 6 ms or less.

The moving speed of the reflection areas 18Y, 18M, 18C is proportional to the size of the entire screen in the liquid crystal cell 12, and is inversely proportional to the length of each reflection area 18Y, 18M, 18C in the moving direction. .

The reflection area 18 of the reflection sheet 18
The moving directions of Y, 18M, and 18C may be any of the vertical direction, the horizontal direction, and the oblique direction with respect to the liquid crystal cell (screen).

In the reflection type color liquid crystal display device 10 according to the example of the above embodiment, in the reflection device 14, the reflection sheet 18 is moved by the driving device 20 to the reflection area 18.
In synchronization with the rotation of Y, 18M and 18C in a predetermined direction at a predetermined speed, the liquid crystal cell 12
6, the pixel becomes a reflection area 18Y, 18M, 18
When it is located on any front surface of C, control for displaying the corresponding color is performed.

Therefore, the reflection areas 18Y, 18M, and 18C sequentially move at intervals of 17 ms or less as described above, and the reflection areas 18Y, 18M, and 18C in the liquid crystal cell 12 are adjusted to the colors of the reflected light Y, M, and C at this time. By controlling the transmittance of each of the pixels 13Y, 13M, and 13C separately and simultaneously, and performing display three times sequentially, light incident from the surface of the liquid crystal cell 12 is reflected after passing through the liquid crystal cell 12. Regions 18Y, 18M, 1
8C, the light becomes a colored light, and passes through the liquid crystal cell 12 again to sequentially perform color display.

On the observer's side, the color light from the three pixels 13Y, 13M, and 13C is displayed simultaneously and sequentially three times in a field period of 1/60 second or less, and the color is temporally changed due to the afterimage phenomenon of the retina. Are mixed and recognized as a color image.

This will be described with reference to FIGS.

FIG. 6 shows a case where white display is performed.
The reflection areas 18Y, 18M, and 18C and the light transmission states of the pixels 13Y, 13M, and 13C in the liquid crystal cell by controlling the transmittance are shown in order of first to third display periods. In the first to third display periods, the reflection area 18Y,
18M and 18C are located on the back surface of the liquid crystal cell 12 in this order.

In the first display period, the reflection area 18Y is located on the back surface of the liquid crystal cell 12, and the three pixels 13
Y, 13M and 13C are all controlled to the maximum transmittance.
The transmissive pixel transmits the color light, and the reflective pixel reflects the color light.

Accordingly, in the outside light, of the three color components of RGB, the G and R color lights are transmitted through the pixel 13Y, reflected by the reflection area 18Y, and emitted again through the pixel 13Y. At the same time, the pixel 13M transmits the R color light, is reflected by the reflection area 18Y, and emits light again through the pixel 13M, and the pixel 13C transmits the G color light and is reflected and emitted by the reflection area 18C.

In the next second display period, the pixels 13Y, 13Y
M and 13C are all controlled to the maximum transmittance. In this case, the reflection area 18M is moved to the back of the liquid crystal cell, and the pixel 1
R color light is emitted from 3Y, R and B color light is emitted from pixel 13M, and B color light is emitted from pixel 13C.

In the third display period, similarly, the pixels 13Y,
13M and 13C are controlled to the maximum transmittance, and at this time, the reflection area 18C is moved to the back of the liquid crystal cell 12. Therefore, the pixel 13Y emits G color light, the pixel 13M emits B color light, and the pixel 13C emits B and G color light.

On the observer side, as described above, the colors are temporally mixed due to the afterimage phenomenon of the retina of the observer, so that the three R, G, and B color lights in the three display periods are mixed. The observer recognizes this as white.

In this case, the pixel 13Y in the first display period, the pixel 13M in the second display period, and the pixel 13C in the third display period
Since two of the three colors of RGB are transmitted, the transmittance is 、, the transmittance is ３ in another pixel in another display period, and the aperture ratio is 1 / Since it is 3, a reflectance of 4/9 in total is obtained.

Since the reflectivity of 4/9 is 3/9 in the related art, the white display of the present invention is 3/9 more than the conventional case.
The brightness is improved by 3%.

Next, the case of yellow display in FIG. 7 will be described.

In the case of yellow, the transmittance of all three pixels 13Y, 13M, and 13C is maximized in the first display period, and only the pixel 13Y is maximized in the second and third display periods. The pixels 13M and 13C are substantially in a light-shielded state.

Thus, in the first display period, G and R color light is emitted from 13Y, R color light is emitted from pixel 13M, and G color light is emitted from pixel 13C. In the second display period, pixels 13Y to R are emitted. Pixel light in the third display period.
The color lights of 3Y to G are respectively emitted, and the observer recognizes that the display is yellow as a whole by the additive color mixture of G and R.

FIG. 8 shows a case where orange, FIG. 9 shows red, FIG. 10 shows purple, and FIG. 11 shows a case where green and blue colors are displayed.

The reflection type color liquid crystal display device 10 according to the example of this embodiment can improve the reflectance by being configured as described above. In particular, in white display, the reflectance can be greatly improved, and therefore, when displaying characters in black, etc., the contrast can be improved.

Further, in the reflective type color liquid crystal display device 10 according to the embodiment of the present invention, since a backlight light source for forming monochromatic light is not required, the power consumption is small, and a battery-powered portable It is suitable for use in electronic equipment and the like.

Next, a reflective color liquid crystal display device 30 according to a second embodiment of the present invention shown in FIG. 12 will be described.

This reflection type color liquid crystal display device (all not shown) has a liquid crystal cell 12 (not shown) similar to the reflection type color liquid crystal display device 10 shown in FIG. 1, and a reflection region different from the above. And a reflection device 34 including a reflection sheet 32.

The reflection sheet 32 includes the reflection area 1
Similar to 8Y, 18M, and 18C, three color Y, M, and C reflective areas 32Y, 32M, and 32C, as well as a light-shielding colored area 33
Is provided.

The light-shielding colored area 33 is colored, for example, black, and its length in the moving direction of the reflection sheet 32 is 50 to 1 of the length of the reflection areas 32Y, 32M, and 32C.
It is about 00%.

On the other hand, in the liquid crystal cell 12, the control device 16 performs black display using a period corresponding to the light-shielding colored region 33 as a blanking period.

Therefore, the reflection sheet 32 in this reflection type color liquid crystal display device has reflection areas 32Y, 32M, 3M.
By sequentially rotating and moving in the order of 2C and the light-shielding colored region 33, for example, as schematically shown in FIG. 13, for example, in the moving image display moving rightward in the figure, from the purple display as shown in FIG. When the display changes to greenish blue, black display is always performed after the display period.

Thus, so-called color breakup can be prevented. That is, the light-shielding colored region 33 is not provided,
Further, when the blanking period for black display is not provided on the liquid crystal cell 12 side, when displaying a moving image similar to the above, as shown in FIG. , G in the first green-blue first display period
Is mixed due to the afterimage phenomenon in the retina of the observer, and a so-called color breakup phenomenon may occur. In the reflection type color liquid crystal display device according to this embodiment, the third display is used. Since black display is performed by the light-shielding colored region 33 after the display of the period, color breakup does not occur.

The ratio of the length of the light-shielding colored region 33 in the moving direction to the reflection regions 32Y, 32M and 32C is preferably 1/2 to 1. If the length of the light-shielding colored region 33 is larger than 1/2 of the entire reflection sheet 32, the light source utilization rate is reduced to half or less, which is not preferable.
This is because, in the following cases, the above-described color break may occur.

In the example of the above-described embodiment, the number of reflection areas for forming reflected color light on the reflection sheets 18 and 32 is only one for each of Y, M and C. However, the present invention is not limited to this. Without being limited thereto, as shown in FIG. 15, the reflection areas 36Y, 36M, 36C of Y, M, C,
Further, two or more sets of these and the light-shielding colored region 37 may be set in one reflection sheet 36.

In this case, the speed of the reflection sheet 36 can be reduced in proportion to the set number of the reflection type color liquid crystal display device 10 as compared with the reflection type color liquid crystal display device 10.

Further, in the above embodiment, the reflection sheets 18, 32 and 36 are continuously driven by the motor 20C. However, the present invention is not limited to this. As in the case of a film, frame advance may be performed for each color and each light-shielding colored area. In this case, a pulse motor may be used as the motor 20C.

As described above, when the reflection area and / or the light-shading colored area in the reflection sheet are intermittently driven and rotated, the holding time of the area can be obtained, so that the visibility of the screen can be greatly improved. Can be done.

[0060]

Embodiments of the present invention will be described below in detail.

Example 1 First, PET having a thickness of 70 μm
Using a film as a substrate, 60
A sheet (manufactured by Nippon Metalli Co., Ltd.) in which an aluminum layer having a thickness of nm was formed as a reflective layer was obtained. A photosensitive material which exhibits tackiness upon exposure was applied thereon to form a photosensitive layer (thickness: 1.5 μm).

Next, the photosensitive layer was exposed to ultraviolet light via a photomask for a light-shielding portion. An ultra-high pressure mercury lamp was used as a light source for exposure.

Thus, a reflection sheet having reflection areas of three colors of Y, M and C was formed. The width of the reflection sheet was 40 mm, and the length of the colored reflection area was 27 mm.

Next, two small cylinders each consisting of a motor and a rotating support attached to the motor were arranged side by side, and the endless belt-shaped reflection sheet was wound around the two cylinders so as to be rotatable.

As a liquid crystal display panel, a TFT-LCD
It was adopted. The display resolution is 640 x 48 for VGA.
0. The alignment film material is SE7210 (Nissan Chemical)
Was applied to a TFT substrate and a counter substrate thereof, and subjected to a parallel rubbing treatment. An optical compensation film having a gap of 6 μm was arranged on both sides of the cell. The size of the panel is 30
mm × 40 mm. LCD is OCB-mode.

As the liquid crystal, LIXON manufactured by Chisso Corporation
TD-6004XX was adopted and its display characteristics were measured. The rotation speed of the two cylinders was synchronized with the response time of the liquid crystal by a control device.

As a result, a good color display could be obtained. In particular, in white display, the brightness could be increased by 33% compared to the conventional one, and when the background was a black character, the contrast could be greatly increased.

(Embodiment 2) The configuration is the same as that of Embodiment 1, except that the reflection sheet has Y, M and C reflection areas, and then a light-shielding colored area of the same length as one color reflection area. Was provided.

In the same manner as in the first embodiment, the rotational speed of the cylinder is adjusted to the response time of the liquid crystal, and a black display period corresponding to the light-shielding colored area is provided on the liquid crystal side.
When the display characteristics were measured, so-called color breakup could be observed in the case of a moving image.

(Example 3) A reflection sheet similar to that of Example 2, wherein the total length of the light-shielding colored area is the same as that of the three-color reflection area, that is, に 対 し て of the total length of the reflection sheet, A good color display screen could be obtained without causing color breakup.

Further, in any of Examples 1 to 3,
Since there was no blinking of the light source, there was no change in light intensity at the time of a rising response and a falling response as in the case of using a short afterglow light source such as an LED, and it was possible to obtain an eye-friendly display with high visibility. did it.

[0072]

Since the present invention is constructed as described above, it is possible to obtain a new field-sequential display type reflection type color liquid crystal display device, whereby the brightness of white display can be greatly increased, and the battery can be improved. It has an excellent effect that it can be used for a driven portable electronic device or the like.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view showing a reflective color liquid crystal display device according to a first example of an embodiment of the present invention.

FIG. 2 is an enlarged schematic plan view showing a configuration of a picture element of a liquid crystal display in the reflective color liquid crystal display device.

FIG. 3 is a developed view showing a reflection sheet in the reflection type color liquid crystal display device.

FIG. 4 is an enlarged cross-sectional view showing one pixel of a liquid crystal cell in the reflective color liquid crystal display device.

FIG. 5 is an enlarged sectional view showing a part of a reflection sheet in the reflection type color liquid crystal display device.

FIG. 6 is a schematic diagram showing a combination of a reflection area of a reflection sheet and a pixel in the case of monochrome display.

FIG. 7 is a schematic diagram of the case of yellow display.

FIG. 8 is a schematic view showing the same orange display.

FIG. 9 is a schematic view showing the same red display.

FIG. 10 is a schematic diagram of the same purple display.

FIG. 11 is a schematic diagram showing the same green-blue display.

FIG. 12 is a perspective view including a development view illustrating a reflection sheet in a reflection type color liquid crystal display device according to a second embodiment of the present invention.

FIG. 13 is a schematic diagram showing a state of color display by the reflective color liquid crystal display device in a relationship between a horizontal position on a screen and a time axis direction.

FIG. 14 is a schematic diagram similar to FIG. 10 when a light-shielding colored region is not provided on a reflection sheet.

FIG. 15 is a developed view showing a reflection area of the reflection sheet according to the third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Reflection type color liquid crystal display device 12 ... Liquid crystal cell 13 ... Picture element 13Y, 13M, 13C ... Pixel 13y, 13m, 13c ... Color filter 14, 34 ... Reflection device 16 ... Control device 18, 32, 36 ... Reflection sheet 18Y , 18M, 18C, 32Y, 32M, 32C, 3
6Y, 36M, 36C ... Reflection area 19 ... Reflection layer 19Y, 19M, 19C ... Coloring layer 20A, 20B ... Roll 20C ... Motor 33, 37 ... Light-shielding coloring area

Claims (7)

[Claims] A picture element includes three pixels provided with yellow, magenta and cyan color filters, and the light transmittance of these three pixels is one for each picture element to be displayed. At least 3 pixels per frame at a time
A liquid crystal cell which is controlled in time series and displays colors by additive color mixing of the three time series displays, and a reflecting device arranged at a position where light passing through the liquid crystal cell is incident. The reflection device includes a reflection sheet having reflection areas of three colors adapted to reflect the color light corresponding to the one frame of yellow, magenta, and cyan colors, and the reflection sheet includes the liquid crystal cell. , The period in which the reflected yellow light and the transmittance of the three pixels of yellow, magenta, and cyan of the liquid crystal cell are combined in synchronization with the three times of display, and the reflected light of magenta and the yellow and magenta of the liquid crystal cell. , And the combination of the transmittances of the three cyan pixels and the combination of the cyan reflected light and the transmittances of the three pixels of the liquid crystal cell, yellow, magenta, and cyan. Previous Color liquid crystal display device characterized by having a drive unit for driving to sequentially move to a position to reflect toward the liquid crystal cell. 2. The liquid crystal display device according to claim 1, wherein the three pixels in the liquid crystal cell display the three pixels when displaying a white color.
A color liquid crystal display device which is controlled so as to have a maximum transmittance corresponding to all of the combination periods of a set. 3. The liquid crystal cell according to claim 1, wherein, when the three pixels in the liquid crystal cell display yellow, the three pixels of yellow, magenta, and cyan are all included in a period in which the reflection area reflects yellow. The color is characterized in that the color is controlled so that the maximum transmittance is obtained, and only the yellow pixels become the maximum transmittance during the period of reflecting the cyan, and only the yellow pixels become the maximum transmittance during the period of reflecting the magenta. Liquid crystal display. 4. The reflection sheet according to claim 1, wherein the reflection sheet has an endless strip shape, and the three color reflection areas are arranged in a longitudinal direction on a front side thereof, and the driving device winds the endless strip reflection sheet. A roll for supporting the roll, and a motor for driving the roll to rotate. The motor and the liquid crystal cell move the reflection sheet while the two reflection areas move on the back surface of the liquid crystal cell. A color liquid crystal display device characterized in that the display is performed multiple times. 5. The liquid crystal cell according to claim 1, wherein the liquid crystal cell is controlled by setting a blanking period in which color display is not performed between frames of a screen to be displayed. At least one set of reflection areas is provided with three colors as one set, and a strip-shaped low reflectance area in a direction orthogonal to the sequential movement direction is provided at a rear end or a front end of each set of reflection areas in the sequential movement direction. Wherein the low reflectance region is moved in synchronization with a blanking period in the liquid crystal cell. 6. The low reflectivity region according to claim 5, wherein:
A color liquid crystal display device characterized by being colored black. 7. The color liquid crystal display device according to claim 5, wherein the length of the low reflectance area in the moving direction is 50 to 100% of the length of one set of reflecting areas in the moving direction. .