JP3576775B2 - Liquid crystal display sheet writing / erasing system and liquid crystal display device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention includes a document, for writing cancellation system and a liquid crystal display device of the display sheet material using a liquid crystal which is used as such as posters and flyers.
[0002]
[Prior art]
For example, JP-A-64-7018 discloses an example of a conventional information recording medium using a ferroelectric polymer liquid crystal. FIG. 10 is a cross-sectional view showing the information recording medium 51. A transparent electrode 53 is formed on one surface of the translucent substrate 52 of the information recording medium 51, and a ferroelectric polymer liquid crystal is applied to the transparent electrode 53 while stretching and orienting the liquid crystal layer 54 to form a liquid crystal layer 54. You. A transparent electrode 55 is formed on the liquid crystal layer 54, and a protective film 56 is formed to cover the transparent electrode 55 as necessary.
[0003]
The method of writing and erasing information on the information recording medium 51 is as follows. First, for the entire erasing, the entire information recording medium 51 is heated until the liquid crystal layer 54 becomes a chiral smectic C (SmC *) phase, a predetermined erasing voltage is applied, and the entire information recording medium 51 is subjected to liquid crystal while the voltage is applied. This is done by cooling layer 54 to a glassy state. The writing is performed by irradiating the liquid crystal layer 54 with laser light while applying a predetermined writing voltage in a glassy state, and heating the irradiated area instantaneously until the SmC * phase is reached, thereby inverting the alignment state of the liquid crystal molecules. Done by Further, partial erasing is performed in the glass state while applying a predetermined erasing voltage in the same manner as in writing. The inversion state of the orientation of the liquid crystal molecules is maintained even when the voltage application is stopped.
[0004]
[Problems to be solved by the invention]
As a manuscript, a poster, a flyer advertisement, and the like, a printed matter in which information is printed on paper is often used. However, once printed information cannot be changed, the printed matter must be discarded when the content is changed. Therefore, the amount of refuse increases, but such increase of refuse is not preferable in terms of destruction of nature and environmental protection. Further, paper and ink are wasted, but this is not preferable in terms of effective use of resources.
[0005]
The information recording medium 51 disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 64-7018 is capable of rewriting information, so that it can be used in place of a printed material to reduce waste and waste paper and ink, but the structure is relatively complicated. Therefore, the recording medium 51 itself becomes large and heavy.
[0006]
An object of the present invention is to provide a write erase system and the liquid crystal display device of a liquid crystal display sheet of a simple structure can be rewritten information.
[0007]
[Means for Solving the Problems]
The present invention provides a liquid crystal display sheet body by arranging a plurality of laminated liquid crystal elements between a polarizing plate and a transflective reflector,
Each liquid crystal element has a pair of liquid crystal sheet bases made of a polymer film , a liquid crystal layer made of a material containing ferroelectric liquid crystal sandwiched between the liquid crystal sheet bases, and the same liquid crystal side of each liquid crystal sheet base. forming a picture element to have a plurality of dot shapes, the pixels in the row and column direction of the pixels adjacent to each other, Ru are arranged in two minutes one pitch by that misaligned staggered matrix look including an alignment film, are stacked sharing adjacent liquid crystal sheet substrate, the liquid crystal layer comprises a different dye,
A writing / erasing system for a liquid crystal display sheet, wherein information is written or erased by passing the liquid crystal display sheet between a pair of charging members to which a predetermined write voltage or erase voltage is applied.
[0008]
According to the present invention, external light such as sunlight or a fluorescent lamp that enters through a polarizing plate serving as a polarizer passes through a liquid crystal element, is reflected by a semi-transmissive reflective plate, and is returned again to the liquid crystal element and the polarized light. The light exits through the plate. At the time of this emission, the polarizing plate functions as an analyzer. In addition, the internal light of the backlight that has entered through the transflective reflector passes through the liquid crystal element and the polarizing plate and exits. A brighter display can be realized by using brighter light by selectively using such external light and internal light. The liquid crystal element uses a pair of liquid crystal sheet substrates made of a material containing a plastic, that is, a polymer film, and a liquid crystal layer made of a material containing a ferroelectric liquid crystal material. Is formed with an alignment film. Writing and erasing of information are performed by passing the liquid crystal display sheet through an electric field of a predetermined voltage. That is, by applying a writing voltage or an erasing voltage, two orientation states of the ferroelectric liquid crystal molecules are selectively controlled. The direction of oscillation of the polarized light incident on the area to which the write voltage is applied is different from that in the area to which the erase voltage is applied, and light in one of the oscillation directions passes through the analyzer and exits. Of the light reflected by the plate, the light in the other vibration direction is blocked by the analyzer. Thus, information can be written and erased only by passing the liquid crystal display sheet through the electric field. Further, since the orientation state of the ferroelectric liquid crystal is maintained even when the electric field is removed, it is not necessary to continuously apply a voltage in order to hold the written information. Therefore, no electrodes are required. As described above, the liquid crystal display sheet of the present invention has no electrodes, has a simple configuration, and is small and lightweight.
[0009]
[0010]
Since a plurality of the same dot-shaped alignment films are arranged in a matrix to form pixels, matrix display is possible. Since the alignment film formed on each liquid crystal sheet substrate is the same, it can be formed in the same process and can be realized easily and at low cost.
[0011]
According to the present invention, for example, three liquid crystal elements respectively corresponding to three colors of yellow, magenta, and cyan are provided to enable color display. In particular, by sharing a common member in each liquid crystal element, constituent elements are simplified, and miniaturization and weight reduction are achieved.
[0012]
[0013]
[0015]
According to the present invention, information can be written and erased by passing the liquid crystal display sheet between a pair of charging members to which a predetermined write voltage or erase voltage is applied.
[0016]
The present invention is characterized in that the charging member is a charging roller or a charging head.
[0017]
According to the invention, a charging roller or a charging head is used as the charging member. That is, when a charging roller is used, information can be easily written and erased by adding a new device that applies a predetermined voltage using the photosensitive drum and back electrode in the existing electrophotographic printing system. it can. When a charging head is used, a device that applies a predetermined voltage instead of an LED driving circuit using a charging head and a back electrode instead of an LED head and a photosensitive drum in a printer system such as an LED (light emitting diode) printer is used. By using, writing and erasing of information can be easily realized.
The present invention provides: (a) a liquid crystal display sheet,
A plurality of laminated liquid crystal elements are arranged and arranged between a polarizing plate and a transflective reflector,
Each liquid crystal element has a pair of liquid crystal sheet bases made of a polymer film , a liquid crystal layer made of a material containing ferroelectric liquid crystal sandwiched between the liquid crystal sheet bases, and the same liquid crystal side of each liquid crystal sheet base. forming a picture element to have a plurality of dot shapes, the pixels in the row and column direction of the pixels adjacent to each other, Ru are arranged in two minutes one pitch by that misaligned staggered matrix look including an alignment film, are stacked sharing adjacent liquid crystal sheet substrate, the liquid crystal layer comprises a different dye,
A liquid crystal display sheet on which information is written or erased by passing the liquid crystal display sheet between a pair of charging members to which a predetermined write voltage or erase voltage is applied,
(B) A liquid crystal display device comprising: a backlight light source disposed on the side of the liquid crystal display sheet opposite to the liquid crystal element with respect to the transflective reflector.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a cross-sectional view showing a configuration of a liquid crystal display sheet 1 which is a premise of the present invention. FIG. 2 is a perspective view of the liquid crystal display sheet 1. The liquid crystal display sheet body 1 has a liquid crystal element 4 disposed between a pair of polarizing plates 2 and 3, and the liquid crystal element 4 is formed of a pair of liquid crystal sheet members 5 and 6 made of a material containing ferroelectric liquid crystal. The liquid crystal layer 7 is sandwiched therebetween. Each of the liquid crystal sheet members 5 and 6 has a structure in which alignment films 10 and 12 are formed on liquid crystal layer 7 side surfaces of liquid crystal sheet substrates 9 and 11 made of a polymer film made of a material containing plastic. (Hereinafter, referred to as “cell thickness”).
[0019]
An alignment film material such as polyimide is applied to one surface of the liquid crystal sheet substrates 9 and 11 which are made of a material including plastic and which is realized by, for example, a laminated (laminated) plate. After the applied alignment film material is fired, an alignment process such as a rubbing process for aligning liquid crystal molecules is performed. Thus, the alignment films 10 and 12 are formed. In the liquid crystal display sheet 1 of the present configuration, the alignment film material is processed into a predetermined pattern by an etching process after baking, and thereafter the alignment process is performed. By such pattern processing, the alignment films 10 and 12 have, for example, the same plurality of dot shapes and are arranged in a staggered matrix. The region of the alignment film is a region of the pixel 8. Thus, the liquid crystal sheet members 5 and 6 are completed.
[0020]
Spacers are scattered on the surfaces of the alignment films 10 and 12 of the liquid crystal sheet members 5 and 6, and the liquid crystal sheet members 5 and 6 are bonded with the sealant 13 such that the surface is on one side. Thereafter, a material containing a ferroelectric liquid crystal is sealed in the gap between the liquid crystal sheet members 5 and 6, thereby forming the liquid crystal layer 7. Usable ferroelectric liquid crystals include naphthalene-based liquid crystals and phenylpyrimidine-based non-chiral liquid crystals. Thus, the liquid crystal element 4 is completed. Polarizing plates 2 and 3 are bonded to the surfaces of the liquid crystal sheet members 5 and 6 opposite to the liquid crystal layer 7, respectively. Thus, the liquid crystal display sheet 1 is completed.
[0021]
The ferroelectric liquid crystal has a multi-layer structure, and the major axis of the liquid crystal molecules is tilted by a predetermined angle from the direction perpendicular to each layer, and the tilt direction is shifted slightly from one layer to the next. A spiral structure is used. The cell thickness of the liquid crystal layer 7 is selected to be much smaller than the helical pitch of the ferroelectric liquid crystal. For example, the value is selected to be smaller than 2 μm, and particularly to about 1.5 μm.
[0022]
FIG. 3 is an enlarged view showing the dot shape of the pixel 8. As the pixel 8 having a dot shape, specifically, a square pixel 8a as shown in FIG. 3A, a circular pixel 8b as shown in FIG. 3B, and FIG. It may be a hexagonal pixel 8c as shown. Other than these, it may be a polygon of 3, 5 and 7 or more. Further, the square may be a square, a rectangle, or a rhombus. Reference numeral 8 is abbreviated with suffixes a, b, and c.
[0023]
In addition, the pixels 8 are arranged in a staggered matrix in which the positions of the pixels 8 are shifted by a half pitch in adjacent rows and columns (see FIG. 7) .
[0024]
The relationship between the polarization axes 2a and 3a of the polarizing plates 2 and 3 and the arrangement direction of the liquid crystal molecules of the liquid crystal layer 7 is such that, in a writing state, for example, incident light transmitted through the polarizing plate 3 transmits through the liquid crystal layer 7 and Are transmitted and emitted, and are selected such that incident light transmitted through the polarizing plate 3 in the erased state is transmitted through the liquid crystal layer 7 and blocked by the polarizing plate 2.
[0025]
FIG. 4 is a diagram for explaining the operation principle of the liquid crystal display sheet 1. One of the polarizing plates 2 and 3 is used as an analyzer, and the other polarizing plate 3 is used as a polarizer. Light passes from the polarizer 3 toward the analyzer 2. The liquid crystal has a phase called a chiral smectic C phase, and this phase is usually used as a ferroelectric liquid crystal. As described above, the ferroelectric liquid crystal has a helical structure, but since the cell thickness is selected to be much smaller than the helical pitch of the ferroelectric liquid crystal, the helical structure is unwound and two bistable states are obtained. Can be The liquid crystal molecules 7a have a spontaneous polarization in a direction perpendicular to the layer, and when a voltage is applied in that direction, the liquid crystal molecules 7a are oriented so as to align the spontaneous polarization in the direction of the electric field. Therefore, by applying the electric fields + E and -E, the orientation direction of the liquid crystal molecules 7a changes. That is, when an electric field + E is applied, a spontaneous polarization PS2 facing the back of FIG. 4 is obtained, and when an electric field −E is applied, a spontaneous polarization PS1 facing the front of FIG. 4 is obtained. Due to such a change in the orientation of the liquid crystal molecules 7a, the vibration direction of the polarized light incident on the liquid crystal layer 7 becomes different.
[0026]
Therefore, the light that has passed through the polarizer 3 and entered the pixel in the written state of the liquid crystal layer 7 is emitted from the analyzer 2. On the other hand, the light incident on the pixels in the erased state of the liquid crystal layer 7 is blocked by the analyzer 2. Information can be displayed in a matrix by such a combination of pixels.
[0027]
FIG. 5 is a side view showing a system for writing and erasing information using the charging rollers 15 and 16, and FIG. 5B is a perspective view. For writing and erasing of information, charging rollers 15 and 16 are provided as a pair of charging members, and a voltage applying device 17 for applying a predetermined voltage between the charging rollers 15 and 16 is provided. Information is written by passing the liquid crystal display sheet body 1 through an electric field of a predetermined voltage, that is, by passing between a pair of charging rollers 15 and 16 to which a predetermined writing voltage or erasing voltage is applied. , Will be erased again.
[0028]
FIG. 6 is a perspective view showing a system for writing and erasing information using the charging heads 18 and 19. For writing and erasing information, charging heads 18 and 19 are provided as a pair of charging members instead of charging rollers 15 and 16, and a voltage application device 17 for applying a predetermined voltage between the charging heads 18 and 19. Is provided. Information is written and written by passing the liquid crystal display sheet 1 between a pair of charging heads 18 and 19 to which a predetermined writing voltage or erasing voltage is applied, as in the case of the charging rollers 15 and 16. Will be erased.
[0029]
By applying a writing voltage or an erasing voltage, two orientation states of ferroelectric liquid crystal molecules are selectively controlled, and writing and erasing of information can be performed only by passing the liquid crystal display sheet 1 through an electric field. . Also, due to the characteristics of the ferroelectric liquid crystal, the written information is retained even when the electric field is removed.
[0030]
FIG. 7 is a waveform diagram showing the applied voltage. For example, a plurality of scanning electrodes are formed on the surface of the charging roller 15, and a plurality of signal electrodes are formed on the surface of the charging roller 16. Similarly, a plurality of scanning electrodes are formed on the surface of the charging head 18, and a plurality of signal electrodes are formed on the surface of the charging head 19. While one scan electrode is selected and the voltage Vs is applied, the signal electrodes are sequentially selected and the voltage Vd is applied.
[0031]
In the liquid crystal display sheet 1, for example, information for one line is written at a time. For this reason, for example, the selection period of the n-th scanning electrode corresponding to the pixels P1 and P2 of (n, m) and (n, m + 1) is 0 (zero) V of 1 slot and Vs of 3 slots, that is, 4 slots. Be composed. Two of these slots overlap with the (n + 1, m) and (n + 1, m + 1) selection periods of the (n + 1) th scan electrode corresponding to the pixels P3, P4. Therefore, the line address time, which is the drive time per scan electrode, can be defined by two slots. On the other hand, the voltage + Vd or -Vd is applied to the signal electrode depending on the display state.
[0032]
Here, when information is rewritten, that is, at the time of writing or erasing, a pre-pulse Vd is applied, and then a rewriting pulse Vs-Vd of the same polarity is applied. When rewriting is not performed, that is, when the writing or erasing state is maintained, a pre-pulse Vd is applied, and then a rewriting pulse Vs + Vd having a reverse polarity is applied. The pulses in the third slot and the fourth slot do not affect rewriting. For example, the voltage Vs is selected to be 30V and the voltage Vd is selected to be 10V.
[0033]
As described above, according to the liquid crystal display sheet 1 having the configuration shown in FIGS. 1 to 7, writing and erasing of information can be performed only by passing the liquid crystal display sheet 1 through an electric field. The written information is retained even if the electric field is removed. Therefore, writing and erasing of information and holding of written information are possible without an electrode. As described above, since the liquid crystal display sheet 1 of the present configuration has no electrodes, the configuration is simple, small, and lightweight.
[0034]
Further, since the same plurality of dot-shaped alignment films 10 and 12 are arranged in a matrix, matrix display is possible. Since the alignment films 10 and 12 formed on the liquid crystal sheet substrates 9 and 11 have the same shape, they can be formed in the same process and can be easily realized.
[0035]
In addition, charging rollers 15, 16 or charging heads 18, 19 are used as charging members. That is, the charging rollers 15 and 16 are a photosensitive drum and a back electrode in an existing electrophotographic printing system, and by using these, a voltage application device 17 is added to easily realize writing and erasing of information. it can. Alternatively , as the charging heads 18 and 19, information is obtained by using a charging head and a back electrode in place of an LED head and a photosensitive drum in a printing system such as an existing LED printer, and using a voltage applying device 17 instead of an LED driving circuit. Can be easily written and erased. In addition to the electrophotographic system and the LED printer, an inkjet printing system may be applied.
[0036]
FIG. 8 is a sectional view showing a color liquid crystal display sheet 21 according to one embodiment of the present invention. The liquid crystal display sheet 21 of the embodiment is different from the liquid crystal display sheet 1 of the above-described configuration in that a plurality of liquid crystal elements basically similar to the liquid crystal element 4 are used in order to perform color display. (Y), three liquid crystal elements 23Y, 23M, and 23C corresponding to magenta (M) and cyan (C), respectively (hereinafter, the reference numeral 23 is used when controlling), and each liquid crystal element 23Y, 23M, and 23C Are laminated.
[0037]
The color liquid crystal display sheet body 21 includes a polarizing plate 22, three liquid crystal elements 23Y, 23M, and 23C, and a transflective reflector 24. Three liquid crystal elements 23Y, 23M, and 23C are stacked and arranged between the polarizing plate 22 and the transflective reflector 24. The yellow liquid crystal element 23Y includes a liquid crystal sheet member 35 formed by forming an alignment film 26 on one surface of a liquid crystal sheet substrate 25 made of a material containing plastic, and a liquid crystal sheet substrate 27 made of a material containing plastic. On the other hand, a liquid crystal sheet member 36 having an alignment film 28 formed on its surface is sandwiched by a liquid crystal layer 39 made of a ferroelectric liquid crystal material to which a yellow dye is added.
[0038]
The magenta liquid crystal element 23M includes a liquid crystal sheet member 36 formed by forming an alignment film 29 on the other surface of a liquid crystal sheet substrate 27, and an alignment film 31 formed on one surface of a liquid crystal sheet substrate 30 made of a material containing plastic. And a liquid crystal sheet member 37 formed by forming a liquid crystal layer 40 made of a ferroelectric liquid crystal material to which a magenta dye is added. The cyan liquid crystal element 23C includes a liquid crystal sheet member 37 formed by forming an alignment film 32 on the other surface of a liquid crystal sheet base 30 and an alignment film 34 formed on one surface of a liquid crystal sheet base 33 made of a material containing plastic. Are formed and a liquid crystal layer 38 made of a ferroelectric liquid crystal material to which a cyan dye is added. The polarizing plate 22 is attached to the other surface of the liquid crystal sheet substrate 25 with high positional accuracy.
[0039]
By writing information only to the yellow liquid crystal element 23Y, only the yellow component is displayed. By writing information only to the magenta liquid crystal element 23M, only the magenta component is displayed, and information is written only to the cyan liquid crystal element 23C. Thus, only the cyan component can be displayed. Here, each dye molecule aligns following the liquid crystal molecule, and thus the degree of absorption of incident polarized light changes depending on the angle of the alignment direction of the dye molecule. Therefore, color display is possible.
[0040]
According to one embodiment, color display of three colors of yellow, magenta, and cyan is possible. In particular, by sharing a common member between the stacked and adjacent liquid crystal elements 23Y, 23M, and 23C, that is, the liquid crystal sheet base materials 27 and 30, the components are simplified, and the size and weight are reduced.
[0041]
In addition, by using a ferroelectric liquid crystal material in which dyes of each color are mixed, only one polarizing plate is required, components are simplified, and miniaturization and weight reduction are achieved. Such an effect can be obtained not only in the color liquid crystal display sheet body 21 having a plurality of liquid crystal elements but also in a case having a single liquid crystal element.
[0042]
Note that as another method of colorization, a method of arranging red (R), green (G), and blue (G) pixels two-dimensionally using a color filter and controlling writing of information to each pixel is used. You may adopt it.
[0043]
Further, in the color liquid crystal display sheet body 21 using the transflective reflector 24, as shown in FIG. 9, light from an external light source 43 such as sunlight or a fluorescent lamp incident through the polarizing plate 22 is: The light passes through the liquid crystal element 23, is reflected by the transflective reflector 24, and passes through the liquid crystal element 23 and the polarizing plate 22 again to be emitted. Further, light incident through the transflective reflector 24 from the internal light source 42 of the backlight disposed on the side opposite to the liquid crystal element 23 with respect to the transflective reflector 24 of the liquid crystal display sheet 21 is 23, the light passes through the polarizing plate 22 and is emitted. In this way, a brighter display can be realized by selectively using the external light and the internal light and using the brighter one. Note that the transflective reflector 24 may be applied to the liquid crystal display sheet 1 having the configuration shown in FIGS.
[0044]
The liquid crystal display sheet bodies 1 and 21 are suitably used for displaying print information requiring a huge number or print information requiring frequent rewriting, and are used for trial printing of print information in addition to posters and flyer advertisements. Can be used.
[0045]
【The invention's effect】
As described above, according to the present invention, a liquid crystal element constituting a liquid crystal display sheet body uses a pair of liquid crystal sheet bases made of a material containing plastic and a liquid crystal layer made of a material containing ferroelectric liquid crystal. An alignment film is formed on the liquid crystal layer side of each liquid crystal sheet substrate. Writing and erasing of information is possible only by passing the liquid crystal display sheet through an electric field, and the written information is retained even when the electric field is removed. Therefore, writing and erasing of information and holding of written information are possible without an electrode. Since there is no electrode in this way, the configuration is simple, small, and lightweight.
[0046]
Since a plurality of the same dot-shaped alignment films are arranged in a matrix to form pixels, matrix display is possible. Since the shape of the alignment film formed on each liquid crystal sheet substrate is the same, it can be easily formed in the same process. Further, since the transflective reflector is used, a bright display can be realized by using external light such as sunlight or fluorescent light and internal light of the backlight.
[0047]
Further, according to the present invention, color display is possible. In particular, by sharing a common liquid crystal sheet base material between adjacent stacked liquid crystal elements, the components are simplified, and the size and weight are reduced.
[0048]
Further, according to the invention, since the liquid crystal layer contains a dye, the configuration can be simplified by using only one polarizing plate.
[0049]
Further, according to the present invention, information can be written or erased by passing the liquid crystal display sheet between a pair of charging members to which a predetermined write voltage or erase voltage is applied.
[0050]
Further, according to the present invention, by using a charging roller or a charging head as the charging member, writing and erasing of information can be easily realized by using an existing electrophotographic system or a printing system such as an LED printer.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a liquid crystal display sheet body 1, which is a premise of the present invention.
FIG. 2 is a perspective view of the liquid crystal display sheet 1. FIG.
FIG. 3 is an enlarged view showing a dot shape of a pixel 8;
FIG. 4 is a diagram for explaining the operation principle of the liquid crystal display sheet body 1;
FIG. 5 is a diagram for explaining an information writing and erasing system using charging rollers 15 and 16;
FIG. 6 is a perspective view for describing an information writing and erasing system using charging heads 18 and 19.
FIG. 7 is a waveform diagram showing an applied voltage.
FIG. 8 is a sectional view of a color liquid crystal display sheet body 21 according to an embodiment of the present invention.
FIG. 9 is a diagram for explaining a method of using light of a color liquid crystal display sheet body 21 using a transflective reflector 24.
FIG. 10 is a cross-sectional view showing a conventional information recording medium 51 disclosed in JP-A-64-7018.
[Explanation of symbols]
1 Liquid crystal display sheet bodies 2, 3, 22 Polarizing plates 4, 23, 23Y, 23M, 23C Liquid crystal elements 5, 6, 35 to 38 Liquid crystal sheet members 7, 39 to 41 Liquid crystal layers 8, 8a to 8c Pixels 9, 11, 25, 27, 30, 33 Liquid crystal sheet base material 10, 12, 26, 28, 29, 31, 32, 34 Alignment film 15, 16 Charging roller 17 Voltage applying device 18, 19 Charging head 21 Color liquid crystal display sheet 24 Half Transmissive reflector 42 Internal light source 43 External light source

Claims (3)

A plurality of laminated liquid crystal elements are arranged between a polarizing plate and a transflective reflector to form a liquid crystal display sheet body,
Each liquid crystal element has a pair of liquid crystal sheet bases made of a polymer film , a liquid crystal layer made of a material containing ferroelectric liquid crystal sandwiched between the liquid crystal sheet bases, and the same liquid crystal side of each liquid crystal sheet base. forming a picture element to have a plurality of dot shapes, the pixels in the row and column direction of the pixels adjacent to each other, Ru are arranged in two minutes one pitch by that misaligned staggered matrix look including an alignment film, are stacked sharing adjacent liquid crystal sheet substrate, the liquid crystal layer comprises a different dye,
A write / erase system for a liquid crystal display sheet, wherein information is written or erased by passing the liquid crystal display sheet between a pair of charging members to which a predetermined write voltage or erase voltage is applied. The charging member includes a charging roller or writing cancellation system of the liquid crystal display sheet of claim 1, wherein it is a static head. (A) a liquid crystal display sheet,
A plurality of laminated liquid crystal elements are arranged and arranged between a polarizing plate and a transflective reflector,
Each liquid crystal element has a pair of liquid crystal sheet bases made of a polymer film , a liquid crystal layer made of a material containing ferroelectric liquid crystal sandwiched between the liquid crystal sheet bases, and the same liquid crystal side of each liquid crystal sheet base. forming a picture element to have a plurality of dot shapes, the pixels in the row and column direction of the pixels adjacent to each other, Ru are arranged in two minutes one pitch by that misaligned staggered matrix look including an alignment film, are stacked sharing adjacent liquid crystal sheet substrate, the liquid crystal layer comprises a different dye,
A liquid crystal display sheet on which information is written or erased by passing the liquid crystal display sheet between a pair of charging members to which a predetermined write voltage or erase voltage is applied,
(B) A liquid crystal display device comprising: a backlight light source disposed on the side of the liquid crystal display sheet opposite to the liquid crystal element with respect to the transflective reflector.

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