KR0150477B1 - A hand writable liquid crystal board set and a liquid crystal display device of externally charging type - Google Patents

Abstract

The present invention includes a screen manufactured in a large size and an external display and erasing operation repeatedly performed in a simple manner, and in fact an external charging type having excellent memory storage performance of recorded images and sufficient permanence. It is to provide a liquid crystal display device.

The present invention also provides a liquid crystal board set which is excellent in operation, performance and safety, and includes the liquid crystal display device as a liquid crystal board.

In the external charging type liquid crystal display device according to the present invention, the conductive layer, a transparent high electroconductivity layer having a volume resistivity of 10 ¹³ Pa · cm or more in an atmosphere of 90% relative humidity and 20 ° C., and the liquid crystal are polymerized. And a lamination structure including a liquid crystal dispersion polymerization layer having a volume resistivity of 10 ¹³ Pa · cm or more in a 20 ° C. atmosphere having a relative humidity of 90% and finely dispersed in a matrix.

The hand-written liquid crystal board set of the present invention comprises (A) a liquid crystal board made of an external charging type liquid crystal display device and (B) display means for displaying an image to be recorded on the board surface of the liquid crystal board. Erasing means for erasing an image and (C) a power supply for generating surface potential between the surface of the liquid crystal board and the conductive layer by the display means.

Here, the display means uses a recording member electrically connected to one terminal of a power source connected to the other terminal in the conductive layer, and the erasing means uses an erasing member electrically connected to the conductive layer.

Description

Hand-written liquid crystal board set and external rechargeable liquid crystal display device

1 is a conceptual diagram showing a recording / drawing state of an external rechargeable liquid crystal display device (liquid information) according to the present invention.

2 is a conceptual diagram showing an image recording state of an external rechargeable liquid crystal display device (liquid information) according to the present invention.

3 is a conceptual diagram showing an image erasing state of an external rechargeable liquid crystal display device (liquid information) according to the present invention.

4 is a conceptual diagram showing a hand-written liquid crystal board set having a cord of the present invention.

5 is a conceptual diagram showing a hand-held liquid crystal board set of a cordless type of the present invention.

FIG. 6 is an actual perspective view showing the set of handwritten liquid crystal boards shown in FIG.

FIG. 7 is an actual perspective view showing the handwritten liquid crystal board set shown in FIG.

* Explanation of symbols for main parts of the drawings

1: External rechargeable liquid crystal display device (liquid information)

2: substrate 3: conductive layer

4: transparent high electrical resistance layer 5: polymerization matrix

6: liquid crystal droplet 7: liquid crystal dispersion polymerization layer

8: transparent insulating layer 9: power supply (built-in automatic power cutoff device)

10: terminal 11: electrical resistance

12: lead 13: electrical resistance

14: terminal 15: lead wire

16: switch contact for a-recording 17: conducting wire

18: b-clear switch contact point 19: lead wire

20: recording member (pen type) 20 ': recording member (stamp type)

21: wire 22: switch contact for b-recording

23: conducting wire 24: switch contact for a-erase

25: electrical resistance 26: lead wire

27: erasing member 28: recording switch

29: board screen 30: recorded video

31: switch for erasing

32: Contact type surface electrode of recording switch

33: contact surface electrode of the switch for erasing

The present invention relates to an external rechargeable liquid crystal display device and a hand-held liquid crystal board set including the present device (A HAND-WRITABLE LIQUID CRYSTAL BOARD SET).

In particular, the present invention relates to a hand-held liquid crystal board set, wherein the display or recording of an image is performed by changing the light scattering state of the liquid crystal by using an electro-optic effect or supply or removal of electrostatic charges, and And display means for displaying an image on the board screen, erasing means for erasing the recorded image, and a power source for generating surface potential on the board screen using the display means.

Many designs have already fabricated related liquid crystal displays using electro-optic effects such as current effects, field effects or liquid crystal thermal effects. Among them, the liquid crystal display device disclosed in Japanese Patent Application Laid-Open No. 55-96922 includes a pair of transparent conductive layers and a liquid crystal dispersion polymerization layer interposed between scattered microcapsules holding liquid crystal.

The present liquid crystal display device has a display effect by changing the arrangement of liquid crystals by turning an electric field on and off between electrodes, so that it is possible to easily obtain a wide display screen having a simple structure.

Nevertheless, the present display device requires the use of a polarizing plate that exhibits this drawback that the display image is dark and the field of view is narrow.

Japanese Patent Application Publication No. 63-501512, as well as US Patent No. 4,435,047, discloses a liquid crystal display device having a simple structure without a polarizing plate to solve the above drawbacks, thereby facilitating the supply of a wide-size display screen.

For this purpose, the liquid crystal display includes a pair of transparent electrodes and a liquid crystal dispersion polymerized layer interposed between the electrodes in which the liquid crystal is finely dispersed in the polymerization matrix.

However, a liquid crystal display device having such a structure cannot be applied to a so-called external charging type liquid crystal display resulting from recording and erasing from the outer surface of the display screen.

As an improvement in this point, Japanese Patent Application Laid-Open Nos. 61-83521 and 3-43715 describe liquid crystal dispersion polymerized layers in which liquid crystals are finely dispersed in a polymerization matrix, conductive layers coated thereon, and images to be recorded. A liquid crystal display device including an image display method formed by providing electrostatic charges on a display device from outside of a liquid crystal dispersion polymerization layer (display screen) and changing a phase and or arrangement of liquid crystals is disclosed.

However, none of these liquid crystal display devices described so far has recorded or erased images on the display device from the outside of the liquid crystal display device.

The liquid crystal display device disclosed in Japanese Patent Application Laid-Open No. 61-83521 is capable of displaying and erasing a recorded image by supplying or removing charges of a corona charge flow type from the outside of the display clean of the liquid crystal display device. will be.

Here, the inventor has studied this kind of liquid crystal display device. However, the supply of charge to the display screen changes the cholesteric liquid crystal into a phase for forming an image to be recorded.

However, it was found that cholestetric liquid crystals whose phase shifted due to the removal of electrostatic charges could not return to their initial state or erase recorded images.

It has been found that in order to erase the recorded image, the liquid crystal must provide an electrical sheet that can be heated above the phase transition temperature or incidentally applied through alternating current development.

It has also been found that the repetition of the display removes the remaining electrostatic charges and displays it next.

In summary, it has been found that complex operations are necessary to repeatedly display and erase recorded images.

In the liquid crystal display device disclosed in Japanese Patent Application Laid-open No. 3-43715, if charge is applied to the display screen from the outside by any one of various charging techniques, the liquid crystal is arranged, which is applied to the liquid crystal display device for displaying the recorded image. Change the light scattering state.

It can be seen from the present disclosure that in order to erase the recorded image thus obtained, it is necessary to provide a reverse charge equal to the amount of the electrostatic charge only in the currently recorded image area.

In practice, however, the amount of reverse charge is much less than the amount of static charge or much smaller, which makes it very difficult to do such an operation.

In this situation, the erase operation is not easy.

In addition, the disclosure apparatus disadvantageously exhibits a lack of storage of recorded images in a relative humidity of 90%, 20 ° C atmosphere or high humidity environment.

Some hand-made liquid crystal board sets have tried to manufacture using the above-mentioned liquid crystal display device, but have hindered their achievement for the reasons mentioned above. In other words, devices previously require complicated display and erasing processes to repeatedly display and erase images or are problematic in operation and performance.

The erasing of the recorded image cannot be performed in the recent apparatus, and furthermore, this apparatus has problems in the persistence of the liquid crystal board and the performance of memory storage of the recorded image under high humidity environment.

For these reasons, it is impossible to obtain a handwritten liquid crystal board having good operation and sufficient durability and the above performance.

SUMMARY OF THE INVENTION The present invention easily provides a display screen of a display device of a wide size having a simple structure, in accordance with the object of the above-discussed content to solve the above-mentioned problems discussed above. It is an object of the present invention to provide an external rechargeable liquid crystal display device having not only excellent memory storage performance of an image but also easy recording and erasing from the outside of the display board and having actual strength such as thermal resistance when using the display board. have.

It is still another object of the present invention to provide a liquid crystal board set including the liquid crystal display as a liquid crystal board and excellent in operation, performance and safety.

In particular, the present invention is used as an example in toys or educational systems, so that it is safely used for actual users, even though the coating material of the conductive conductor source connected to the power source is peeled off to make the electrical connection when recording or erasing by hand. There is provided a hand-made liquid crystal board set which is used in which the member does not cause a harmful effect even if a direct contact occurs on any part of the human body.

The present inventors concentrated on the handwritten liquid crystal board set in order to achieve the above object.

As a result, the present invention has been completed by knowing that a liquid crystal device and a hand-written liquid crystal board set having the following configuration can provide performance and operation degree that are satisfied by real users.

An external rechargeable liquid crystal display device of the present invention has the features of the following items (1) to (3).

(1) The external charging type liquid crystal display device according to the present invention has a conductive high layer, a transparent high electroconductivity layer having a relative resistivity of 90% and a volume resistivity of 10 ¹³ Pa.cm or higher in a 20 ° C. atmosphere, and a liquid crystal in a polymerization matrix. It includes a liquid crystal dispersion polymerization layer having a finely dispersed and having a volume resistivity of 10 ¹³ Pa.cm or higher in a relative humidity of 90% and 20 ° C., a transparent insulating layer, and all of the above layers in successive layers.

(2) The method according to (1), wherein the high electron resistance layer includes a polymer or film having a crosslinked structure.

(3) The polymer matrix according to (1), wherein the polymer matrix of the liquid crystal dispersion polymerized layer is composed of a polymer having a crosslinked structure.

The hand-written liquid crystal board set of the present invention has the features of the following paragraphs (4) to (12).

(4) According to another aspect of the present invention, the liquid crystal board set includes (A) an external charge type liquid crystal board having a transparent high electric power having a conductive layer and a relative humidity of 90% and a volume resistivity of 10 ¹³ Pa.cm or more in a 20 ° C atmosphere. The resistive layer and the liquid crystal are finely dispersed in the polymerization matrix, and the liquid crystal dispersion polymerized layer and the transparent insulating layer have a volume resistivity of 10 ¹³ Ω.cm or more in an atmosphere of 90% relative humidity and 20 ° C, and all the above layers are sequentially It includes layers.

(B) display means for displaying an image to be recorded on the board surface of the liquid crystal board, erasing means for erasing the recorded image, and (C) display means for controlling the surface potential between the surface of the liquid crystal board and the conductive layer. A power source for generating, wherein the display means uses a recording member electrically connected to one terminal of the power source connected to the other terminal of the conductive layer and the erasing means uses an erasing member electrically connected to the conductive layer.

(5) The method according to claim 4, wherein the high electron resistance layer includes a polymer or a film having a crosslinked structure.

(6) The polymerization matrix of the liquid crystal dispersion polymerization layer is composed of a polymer having a crosslinked structure.

(7) The method according to claim 4, wherein the recording member, the conducting wire electrically connected to the recording member itself and the power supply, and each have a volume resistivity of 10 ¹² Ω.cm or less at a relative humidity of 50% and 23 ° C. A conductive wire electrically connected to both the erasing member itself and the erasing member and the conductive layer.

(8) The electric resistance according to claim 4, wherein an electrical resistance of 200 KΩ to 100 MΩ is electrically connected at least between one terminal to the power supply and the conductive layer, and one terminal to the power supply and the cancellation member and the conductive layer and the cancellation member. do.

(9) The electric circuit according to claim 4, wherein the electric circuit including the display means and the erasing means is provided with an interlock device to prevent the occurrence of an electric shock.

(10) The electric circuit according to claim 4, wherein the electric circuit including the display means and the erasing means includes an automatic power cutoff device.

(11) The method according to claim 4, wherein the board surface or the recording member and the erasing member require a dust prevention process.

(12) The apparatus according to claim 4, wherein the recording member or the erasing member includes a substrate such as a film or a sheet having a form of the conductive material formed above.

The liquid crystal board for an external liquid crystal display device or a hand-held liquid crystal board set of the present invention is a transparent high electromotive resistance layer or liquid crystal mainly having a conductive layer, a relative humidity of 90%, and a volume resistivity of 10 ¹³ Pa.cm or more at 20 ° C. The droplets are dispersed in a polymerization matrix and formed successively in a liquid crystal dispersion polymerized layer having a volume resistivity of 10 ¹³ Pa.cm or higher in a relative humidity of 90% and 20 占 폚 and a transparent insulating layer structure. The conductive layer on the liquid crystal board is transparent or opaque unless the surface resistance is more than 10 ⁷ Ω.cm.

In practice, one glass or plastic film, such as polyester or polyimide, is used as the substrate and the surface of the substrate is aluminum, titanium, chromium, tin, rhodium, gold, stainless iron, titanium nitride, nickel-chromium alloy, aluminum It is coated with chromium alloy or indium tin oxide.

As a component of the external charging type liquid crystal display device of the present invention, the liquid crystal dispersion polymerized layer includes a liquid crystal finely dispersed in a neutral matrix. As a better feature of the liquid crystal dispersion polymerization layer, the liquid crystal droplets are elaborately and individually dispersed in the polymerization matrix to improve the volume resistivity of the liquid crystal dispersion polymerization layer.

The ratio of the polymerized layer / liquid crystal to the liquid crystal dispersion polymerized layer falls within the range of 9/1 to 1/9 and preferably falls to 7/3 to 5/5.

Finely dispersed liquid crystal droplets of very large or very small size range from about 0.1 to 2.0 [mu] m, which is better because they lower the performance of white haze to clear recorded images.

The liquid crystal dispersion polymerization layer thus obtained has a thickness of 1 to 50 µm.

The volume resistivity of the liquid crystal dispersion polymerization layer is preferably 10 ¹³ Pa.cm in a relative humidity of 90% and 20 占 폚 atmosphere.

With a volume resistivity of less than 10 ¹³ Pa.cm, the electrostatic charges for forming the recorded image cannot be kept balanced between the upper and lower interfaces of the liquid crystal dispersion polymerized layer and move easily.

The contour of the recorded image is evaporated without sharpness with the change of time.

As the polymer used as the liquid crystal dispersion polymerization layer, vinyl resins such as polyvinyl acetal, acrylic resin and the like, polyester, polysulfone, polysenylene oxide, ionic body, polycarbonate, polyol epine and the like are mentioned.

Examples include functional groups such as double bonds, nitra, melcapto-, hydroxy-, carboxy-, epoxy-, chlorine-containing, fluorine-containing, isocyanate-, methoxy-, amino-, or chlorosulfone-groups and the like. Silicone polymers and polymers comprising a.

In particular, polyvinyl acetal, acrylic resin, epoxy resin, polyester, polyamide vinylidene chloride, vinylidene chloride resin, silicone resin, chlorinated polyethylene, chlorosulfonated polyethylene, polyphenylene oxide, styrene-butadiene rubber, ions Vinyl resins such as sieves, fluororesins and the like are mentioned.

The following polymers having a crosslinked structure (hereinafter referred to as crosslinked polymers) are preferably used.

Crosslinked fillers are polymers having one of the aforementioned functional groups having a reactive polymer to react between crosslinked polymers or by mixing a crosslinker reacted with a functional group to react between the crosslinked polymers and a polymer having one of the aforementioned functional groups. It is obtained by mixing.

Cross-defective polymers do not exhibit any compatibility with liquid crystals at elevated temperatures.

This is to keep the finely dispersed liquid crystal structure stable.

Therefore, the liquid crystal dispersion polymerization layer is doubled and the deterioration of performance does not occur after the change of time.

Examples of crosslinkers used as the above-mentioned reactants include organic oxides, amine compounds, aziridine compounds, epoxy compounds, anhydrides of dicarboxylic acids or carboxylic acids, formaldehyde, dialdehydes, diols, bisphenols, Silanol compounds, metal oxides, rapid halides, photocrosslinkers (photopolymerization initiators) and the like. Examples of the reactive polymers include phenol resins, amino resins, polyisocyanates, polyols, epoxy resins and the like.

Preferred crosslinked polymers include crosslinked polymers formed by reaction between di or poly-isocyanate salts and polymers, acrylic resins having a functional group such as polyvinyl acetal resin, epoxy resin, hydroxy group, carboxyl group, polyester resin, fluorine, etc. Resins and the like are mentioned.

The liquid crystal used in the present invention includes a nematic liquid crystal having positive dielectric anisotropy.

This liquid crystal liquid crystal board needs a quasi-crystalline temperature range of -10 to 100 ° C., which corresponds to actual users, and preferably has a birefringence (Δn) ratio of 0.2 or more, which sharpens the recorded image, It is to improve the blur.

This liquid crystal is added with dichroic color tone as required.

The dispersion of the liquid crystal in the polymerization matrix is carried out by the polymer-liquid crystal common solvent evaporation separation process (common solvent casting process), the precursor mixture of the liquid crystal and the polymer is polymerized phase separation process in which the liquid crystal and polymer are polymerized by light or heat, Melt-cooled phase separation process which was carried out by melting and cooling, or by making microcapsules of the liquid crystal and dispersing the liquid crystal in the polymer.

The transparent polymer having high electrical resistance is used as the transparent insulating layer in the liquid crystal board of the present invention.

The volume resistivity of the layer is preferably 10 ¹³ Pa.cm or more at 20 ° C. atmosphere and 90% relative humidity.

Examples of transparent insulating layers include films made of polyethylene phthalate, polyethylene naphthalic acid, polypropylene, polyethylene, polyvinylchloride, polysulfone, polyphenylene oxide, ionic material, polycarbonate, nylon or fluororesin. A combination of laminated or bonded with an adhesive or a solution of a material having the aforementioned physical properties and combined to dry.

The use of a material having a volume resistivity of less than 10 ¹³ Ω.cm at 20 ° C atmosphere and a relative humidity of 90% of a transparent insulating layer causes problems in practice for the same reason as described above for the liquid crystal dispersion polymerized layer. It cannot be matched to actual users. The transparent high electromotive resistance layer of the liquid crystal board of the present invention is located between the conductive layer and the liquid crystal dispersion polymerization layer.

The volume resistivity is 10 ¹³ Ωcm or more at 20 ° C atmosphere and 90% relative humidity.

This layer very reliably prevents the static charges remaining on the upper and lower interfaces of the liquid crystal dispersion polymerized layer from being moved and attenuated, thereby improving performance in sharpness, memory storage, erasing capability, etc. of the recorded image.

The use of a material having a volume resistivity of 10 ¹³ Pa.cm or less at 20 ° C. atmosphere and a relative humidity of 90% of a transparent high-electromagnetic resistance layer causes problems in practice for the same reason as described above for the liquid crystal dispersion polymerized layer. The obtained liquid crystal board is not suitable for actual users.

The following crosslinked polymers are used as the transparent high resistance layer. Crosslinked polymers include double bonds, nitrile-, melcapto-, hydroxy-, carboxy-. Epoxy-. With chlorine, with fluorine, isocyanate-. One of the methoxy-, amino-, chlorosulfone groups, such as silicone polymers having functional groups and polymers reacts with the functional groups for reacting between them and is mixed with the crosslinking agent, or one of the polymers having the aforementioned functional groups is crossed Obtained by mixing with the reacting polymer to form a binding polymer. Examples of crosslinkers used in the above reactions include organic peroxides, amine compounds, aziridine compounds, epoxy chemicals, anhydrides of dicarboxylic acids or carboxylic acids, formalaldehydes, dialdehydes, diols, bisphenols, and saranol compounds , Metal oxides, metal halides, photocrosslinking binders (photopolymerization initiators), and the like.

Examples of the reactive polymers include phenol resins, amino resins, polyisocyanate salts, polyols, epoxy resins and the like.

Preferred crosslinked polymers include crosslinked polymers prepared by reaction between di or poly-isocyanate salts with one polymer, acrylic resins having functional groups such as polyvinyl acetal, epoxy resin, hydroxy group, carboxyl group, polyester resin, fluorine. Resins and the like are mentioned.

The transparent high resistance layer uses a film, and the polymerized film may be polyethylene terephthalic acid, polyethylene, polyvinyl chloride, polysulfone, polyphenylene oxide, ionic body, polycarbonate, nylon, fluororesin, silicone doublet, or the like. Can be combined. Each of the liquid crystal dispersion polymerization layer, the transparent insulating layer, and the transparent high electrical resistance layer is provided to the layer by an application process in which a polymerization solution is added and dried, or a lamination process in which the polymer film is bonded with an adhesive.

In the liquid crystal board of the present invention, in order to obtain an image having a clear contrast, dichroic color tone is added to the liquid crystal of the liquid crystal dispersion polymerization layer in order to change the color tone of the board screen.

On the other hand, any color can be assigned to the board screen and the image if it is distributed as a color layer on the outside of the substrate with a transparent conductive layer and a substrate, paper, plastic film or other material, thus making it possible to form a clear contrast image. .

The display means for recording images used in the handwritten liquid crystal board set of the present invention is connected to one terminal of a power supply connected to the other terminal of the conductive layer of the liquid crystal board to generate a surface potential between the surface of the liquid crystal board and the conductive layer. An electrically connected recording member is used. It is possible to form an image to be recorded when the recording member is brought into contact with the board screen of the liquid crystal board.

If the surface potential is generated on the board screen, the liquid crystals of the liquid crystal dispersion polymerized layer are arranged by the electrostatic field so that the arranged portions become transparent to the white blurry board screen to form an image having high contrast.

When the surface potential is less than the threshold level above that of the liquid crystals of the liquid crystal dispersion polymerization layer, the liquid crystals cannot be arranged to be completely transparent.

The image recorded as a result is lacking in contrast.

The erasing means for erasing the recorded image in the hand-written liquid crystal board set of the present invention includes an erasing member electrically connected to the conductive layer of the liquid crystal board.

The erasing member is placed on the board screen of the liquid crystal board (or more precisely, on the surface of the transparent insulating layer) when contact with the recorded image occurs and the recorded image and the conductive layer become equipotential. Haas can be easily removed to erase the recorded image.

In the hand-written liquid crystal board set of the present invention, the display means extending from the conductive layer to the erasing member as well as the terminal to the recording member of the power supply is 10 ¹² Ω · cm or less at 23 ° C atmosphere and 50% relative humidity. And a conductive material having a volume resistivity of 10 ¹⁸ Ωcm or less and a preferred conductive material having a volume resistivity of 10 ¹⁸ Pa · cm or less.

For arranging liquid crystals or for easily removing electrostatic charges and restoring from an orderly state to an initial state of the liquid crystal when a picture or erasing operation is performed with display means or erasing means made of a conductor of 10 ¹² 12cm or less It is possible to gently provide static charges on the board surface.

As a result, images with high contrast and smooth erasing are easily achieved.

On the other hand, if the volume resistivity of the conductor is 10 ¹² Ω · cm or more, the contrast of the recorded image is low, the response is slow, and the erasing ability is insufficient, so the desired erasing ability cannot be obtained unless many erasing operations are repeated.

This trend is undesirable in handwritten liquid crystal board sets.

For example, initially in the present invention, transparent images are formed on a white blurred background of a board screen.

No matter how white the image is, however, against the original display, it can also be obtained on a transparent board screen.

First, this is done by providing electrostatic charges on the board screen as a whole by the recording member in order to arrange the liquid crystals, and by removing the elements of the electrostatic charges from the board screen by the erasing member.

In the hand-written liquid crystal board set of the present invention, the recording member used as the display means and the erasing member used as the erasing means are electrically connected to one terminal of the power supply and the conductive layer, respectively.

Here, the electrical connection should not be assumed as the connection of the conductors. For example, since the human body is an electrical conductor, it is possible for a part of the human body to be used for drawing and erasing.

That is, by touching the appropriate portion of the display means with one hand, the operator can make an image in the same way with the above display means by touching the board screen with the recording member held by the other hand. In a similar manner, by touching the appropriate portion of the erasing means with one hand, the operator can erase the image recorded in the same way with the above erasing means by touching the board screen with the erasing member held by the other hand.

In this case, it is also possible to draw or erase images directly with hands or fingers without any recording or erasing member.

In the hand-written liquid crystal board set of the present invention, the recording member and the erasing member are made of metal or copper alloy, iron, aluminum, tin, palladium, gold, silver, brass, stainless iron, and the like.

It is also composed of metallic oxides such as tin, indium, silver, zinc and manganese, conductive polymers such as polypyrrole, polythiophene and polyaniline, and conductive materials such as graphite and carbon fiber.

These materials can be used in various forms depending on the properties of the material.

In other words, some of these materials are formed directly into wires (conductors), contacts (terminals), or conductive structures.

On the other hand, to coat the surface of plastic film, structure, non-woven structure, eraser, sponge, glass, etc. with one of the above materials to make a conductive film, conductive fiber, conductive eraser, conductive sponge, conductive glass and the like.

Alternately, tissues or fibers formed by processing some materials into tissues or fibers are mixed with plastics or rubber to form conductive plastics, conductive erasers, conductive multi-parks, and the like. These products have to be treated incidentally to be used as a bond or to be used as a recording or erasing member depending on the purpose.

By providing the recording member or the erasing member in the stamp young using the conductive elastic material, any character or any form can be easily displayed by contacting the stamp on the board screen.

It is possible to easily display complex shapes or shapes such as maps on a board screen at a time by using a film-like or sheet-like substrate having a conductive form formed by alternating transparent or opaque ink or conductive resin.

In addition, it is possible to change the trace of the recorded image as narrowly or broadly as if written by a handwriting brush by using and using the handwriting-conductive conductive fiber or ballistic material.

The power supply in the board set of the present invention is constituted by a preferred DC power supply which substantially provides a potential difference between the conductive layer and the recording member to generate surface potential on the board screen.

For example, any power source is used until it meets the above requirements.

In the hand-made liquid crystal board set of the present invention, if the operator comes into contact with a part of the display means by the generation of surface potential on the board screen of the liquid crystal board, there is a possibility or fear of electric shock. So this aspect should be considered.

A safe mechanism (or interlocking device) has been developed to address this problem and a hand-made liquid crystal board to prevent electrical shock from occurring even when the operator's body is in contact with the parts of both display and erase means at the same time. Sets are provided.

Here, or the interlock mechanism in this handwritten liquid crystal board set acts as such a structure of a power supply that provides surface potential on the board screen via display means in which one terminal of the power source and the other terminal are connected to the conductive layer.

On the other hand, the erasing means for erasing the image recorded on the board screen is connected to its terminal of the power source connected to the conductive layer.

In this structure, the interlock device operates as a safety device having an electrical or mechanical function such that at least one of the terminals of the display means and the erasing means is not connected when the operator's body contacts both display means and the erasing means at the same time. .

Electrical resistances of 200 kV to 100 kV, incident to the interlock, are provided between the conductive layer side terminals and the conductive layer of the power source, between the erasing member of the power source, and between the conductive layer and the erasing member, respectively. These resistors provide improved safety to a handwritten liquid crystal board set, so that an electric shock cannot be detected if the display means and / or the erasing means come into contact with the operator's body.

The resistance used here should be in the range of 200 kV to 100 kV for the generated voltage of 50 to 1000 volts, more preferably in the range of 1 k to 40 kV. The reason for limiting the resistance is that if the display means and the erasing means come into contact with the human body through a resistance of less than 200 mA when 1000 volt power is used, 5 mA or more current flows through the body to generate an electric shock. to be.

On the other hand, if a resistance of 100 kΩ or more is used, a short circuit may easily occur due to a relationship with other insulation resistance in the substrate, resulting in a voltage drop of the generated voltage.

Degradation of the response to the display and erase operations results in the inability to perform the slow operation of display and erase operations.

Hand-made liquid crystal board sets are highly improved in safety and used by anyone without fear or worry because of the electric shock prevention method based on both interlock and resistance. The handwritten liquid crystal board set thus improved in safety can be applied to a cordless set.

In a cordless handwriting liquid crystal board set, the power supply is connected to one terminal of the conductive layer while the other terminal of the power supply is connected through the resistance of the surface electrode acting as a push button of the recording switch.

The conductive layer is also connected via a resistor to another surface electrode which acts as a push button of the erasing switch.

Here, the recording and erasing switch has a linkage structure.

The serial write switch contact (b) and the erase switch contact (a) are connected to one terminal of the power supply, while the serial write switch contact (b) and the erase switch contact (a) are connected to the other terminal of the power supply. Connected.

By touching the surface electrode of the recording switch with the left hand to press the recording switch with this apparatus, the operator can draw the image to be recorded by touching the board surface with the right hand or with the recording member held by the right hand.

On the other hand, by touching the surface electrode of the erasing switch with the left hand to press the erasing switch, the operator can erase the recorded image by touching the board surface with the right hand or with the erasing member held by the right hand.

In the above two cases, since the conductor is not necessary, the hand-written liquid crystal board set is simple and does not fail even if the display and erasing are repeated many times.

In the hand-written liquid crystal board set of the present invention, an automatic power cut-off device is provided in the electric circuit for the display means.

This device is a power-saving device that does not waste power because the switch of the power supply automatically shuts off after a predetermined time if the switch is kept ON.

In the hand-made liquid crystal board set of the present invention, the board screen, the recording member, and the erasing sources have been injected or coated with oil. Alternately, the polymer film is coated over these items.

With this treatment the board screen will not be dirty.

The oils used above should have a volume resistivity of 10 ¹³ Ω.cm or higher at 23 ° C atmosphere, 50% RH relative humidity, boiling point at 200 ° C or higher, insoluble in water and low surface tension.

Examples of oils include insulating oils, silicone oils, fluorine oils and the like.

Repetition of marking and erasing on the board screen leaves oil, sweat, cosmetics or other dust on hands touching the board screen little by little over a long period of time.

Electrostatic charges attached to it are easily generated and easily moved and thus attenuated.

As a result, the sharpness of the sharpness of the recorded image occurs, and the memory complementary and erasing capability is lowered.

The above treatment eliminates or prevents this adverse effect.

In the hand-held liquid crystal board set of the present invention, display and erasure of an image to be recorded are performed on the basis of the principle that the presence or absence of an electrostatic field in the liquid crystal dispersion polymerization layer of weak information is generated transparently and opaquely on an external rechargeable liquid crystal display device. do.

In particular, the liquid crystal droplets in the liquid crystal dispersion polymerization layer are finely dispersed in the polymerization matrix and the molecules of the liquid crystal are arranged along the outer wall of the polymerization layer.

Therefore, when the electrostatic charge is not supplied, the refractive index difference between the polymerized layer and the liquid crystal causes light scattering and causes the liquid crystal board to be white or opaque.

On the other hand, if an electric field is applied to the liquid crystal dispersion polymerization layer through the transparent insulating layer by the display means, the liquid crystal is directed in the direction of the electric field.

In this arrangement, the refractive indices in the polymerized layer and the liquid crystal are substantially equal to each other.

As a result, light scattering is prevented from occurring in the transparent region or contrast is generated between the board screen and the recorded image to express the display state (FIG. 1).

The electric field generated in the liquid crystal dispersion polymerization layer in order to erase the image must be removed by the erasing means.

By this operation, the liquid crystal returns to the initial state or to the state where no electric charge is present.

The light then scatters again, resulting in a white screen (3rd degree) board screen.

According to the hand-set liquid crystal board set of the present invention having the above-described structure, it is easy for anyone to record an image by hand and to erase the recorded image by using simple display and erasing means without the need for complicated apparatus and cumbersome operation. It is possible. In addition, although the electrical operation, i.e., the supply and removal of the electric charge is performed at the time of displaying and erasing, the board set is excellent in safety without fear of causing an electric shock to the human body.

According to the foregoing, the liquid crystal display device is formed so that the liquid crystal dispersion synthesis layer is directly stacked on the conductive layer.

The supply of electrostatic charges in such a liquid crystal display is performed in various ways, for example, voltage application, corona discharge, contact electric charge, and the like.

This generates an electric field where the electric charge is provided.

Although the electric field thus generated arranges the liquid crystal to form an image, the electrostatic charges move and decay with the change of time.

In other words, the electric field attenuates and disappears with time, and the arrangement of the nematic liquid crystals returns to its initial state, resulting in a defect in the memory performance as the display means.

However, in the present invention, the high electron resistance layer is disposed between the conductive layer and the liquid crystal dispersion polymerization layer, thereby significantly improving the performance of memory storage. This prevents the high-electromagnetic resistance layer from moving the static charge and does not leave the electric field of the recorded image (FIG. 2), which provides excellent performance for memory storage of recorded images not made by conventional structures. Considered.

In the liquid crystal display device of the present invention, the recorded image portion can be easily removed by electrically connecting the surface of the recorded image portion or the transparent insulating layer with the conductive layer so that the two electrostatic portions are on the coin.

As a result, the electric field is lost as the alignment of the liquid crystal returns to its initial state.

In short, erasure of the recorded image can be performed in a simple manner.

In the conventional liquid crystal display device, the electrostatic charges remaining in the liquid crystal dispersion polymerized layer on the side of the conductive layer move and attenuate with time. Thus, the amount of static charge between the upper side and the lower side of the liquid crystal dispersion polymerization layer is unbalanced.

This unbalance of charges makes it difficult to remove or eliminate an electric field from the surface of the transparent insulating layer, resulting in insufficient erasing ability.

However, in the present invention, the supply of the high electromotive resistance layer also improves the erasing ability.

This considers that the high resistance layer prevents the electrostatic charge from moving and maintains the balance of the electrostatic charge between the upper and lower sides of the liquid crystal dispersion polymerized layer to provide an excellent erasing ability of the recorded image which is not achieved in the conventional structure. Doing.

Generally, a transparent insulating layer is provided for the purpose of protecting the liquid crystal dispersion polymerization layer.

That is, this provision is intended to prevent the liquid crystal dispersion polymerization layer serving as the display screen from being easily damaged by friction and abrasion due to other causes when recording and erasing.

However, the supply of a transparent insulating layer also prevents electrostatic charge attenuation from the liquid crystal dispersion polymerized layer even at high humidity, especially at 23 ° C. atmosphere and 90% relative humidity.

This cleans the recorded image without blurring the outline of the recorded image over time and improves the memory storage performance and erasure capability of the recorded image.

This is to consider that the transparent insulating layer maintains the balance of the electrostatic charge between the upper side and the lower side of the liquid crystal dispersion polymerization layer.

According to the present invention, a wide board screen is provided in a handwritten liquid crystal board set and the display and erasure of an image is caused from the outer side of the board screen due to the features of the external rechargeable liquid crystal board used above.

In addition, the memory storage performance of the recorded image is excellent, so that the liquid crystal board has sufficient durability in practical use.

In addition, the handwriting permanence in practical use, and also the handwriting liquid crystal board set is designed in consideration of the safety of protection against electric shock and even for children to safely operate the board set.

Therefore, the device of the present invention is suitable not only for business users but also for a wide range of users not only for educational use but also for toys or games.

Example 1

This will be described with reference to FIGS. 4 and 5.

(a) Providing an external rechargeable liquid crystal display device, a precipitated aluminum layer (# 125 Metallumy manufactured by Toyo Metal Co., Ltd.), which is an aluminum-deposited film having a substrate 2 made of a polyethylene terephthalic acid film. ) TS) is used as the conductive layer 3 on the addition of a solution having the following composition and dried and cured as a high resistance transparent layer 4 having a dry film thickness of 3 mu m.

9.0 g of 10% polyvinyl (DENKAFORMAL # 20 manufactured by DENKI KAGAKU KOGYO KABUSHIKI KAISHA) in a tetrahydrofuran solution

Polyisocyanate (TAKENATE D110N manufactured by Takeda Chemical)

0.4g

The solution having the following composition is added to a dry thickness of 7 mu m to form a liquid crystal dispersion polymerization layer 7 in which liquid crystal droplets are finely dispersed in the polymerization matrix, dried and cured.

4.2 g of 10% polyvinyl (VINYLEC K-G24 manufactured by Chisso) in tetrahydrafuran solution

0.56 g polyisocyanate (TAKENATE D110N manufactured by TAKEDA Chemicals)

0.36 g of nematic liquid crystal (E44 manufactured by MERCK)

In order to complete the external charging type liquid crystal display device 1, a transparent insulating layer 8 having a polyethylene terephthalic acid film (TETRON film F manufactured by TEJIN LIMITED) having a thickness of 9 µm using a binder was formed in the liquid crystal dispersion polymerization layer. Stacked on top.

The transparent high electric resistance layer 4 and the liquid crystal dispersion polymerized layer 7, which were adjusted to the atmosphere at 20 ° C. at 90% RH, were manufactured by using a direct current power source (PR-630 manufactured by TORIO) and an electrometer (TR8651 manufactured by Takeda Riken), The rust resistivity is measured using an insulation resistance (TR42 manufactured by ADVANTEST CORPORATION) which measures the material chamber.

The result is below.

Transparent high resistance layer 1.5 × 10 ¹⁴ 14cm

Liquid Crystal Dispersion Polymerization Layer 7.4 × 10 ¹⁴ Ωcm

(b) provision of a handset liquid crystal board set;

The cord-type handwritten liquid crystal board set is provided as the next step by using the externally charged liquid crystal display device as the liquid crystal board 1.

The conductive layer 3 of the externally charged type liquid crystal board 1 is a non-explained 1.5V battery (U-3 type) through a series resistor 11 of 10 ,, a conductor 12, and another 10 ㏁ resistor 13. Is connected to one terminal 10 of a DC power supply generating a voltage of 600V between the terminals.

Another terminal 14 of the power source is connected via a series of conductive wires 15, recording switch contacts (a) 16, conductive wires 17, erasing switch contacts (b) 18 and conductive wires 19. It is connected to a recording member 20 made of a conductive sponge (MOSPAC P, manufactured by FUJIMORI KOGYO Co., Ltd.) having a volume resistivity of 5 x 10 ⁴ Pa.cm at 50 캜.

Another conducting sponge (MOSPAC GS, manufactured by FUJIMORI KOGYO) with a volume resistivity of 4 × 10 ³ Ω · cm at 23 ° C atmosphere and 50% RH is a series conductor (21), switch contact for recording (b) (22) And the conducting wire 23 and the male position contacts (a) 24 for erasing, the 10 kΩ resistor, the conducting wire 26, and the conducting wire 12 are connected as the erasing member 27.

A timer circuit of about 5 minutes of cut-off time (not shown) is embodied as an automatic power cut-off device between the U-3 type 1.5V battery and the power source 9. The recording switch 28 includes contacts (a) 16 and contacts (b) 18 connected to each other to form an interlock mechanism.

The erasing switch 31 comprises contacts (b) 22 and contacts (a) 24 connected to each other to form an interlock mechanism.

In the normal state, the erasing switch contacts (b) 18 (and the recording switch contacts (b) 22 are connected, while the contacts (a) 16 of the recording switch and the contacts of the erasing switch ( a) 24 is in a disconnected state As described above, the hand-written liquid crystal board set of this embodiment is provided.

(C) Recording member and image to record

Pen-type recording member: The figure was written on the board screen 29 of the liquid crystal board 1 using the recording member 20 while the recording switch 28 was pressed.

As a result, the surface potential is generated in the portion written on the board screen 29, and the electrostatic field formed can arrange the liquid crystals of the liquid crystal dispersion polymerization layer so that the image 30 to be recorded in the picture can be displayed.

Stamp type recording member: The stamp 20 'is provided as a conductive sponge (product of FUJIMORI KOGYO, MOSPAC P) having a volume resistivity of 5 × 10 ⁴ Ω · cm at 23 ° C atmosphere and 50% RH. It became.

The use of the stamp 20 'made it possible to easily record and display images of characters and pictures on the board screen 29 at the same time.

Pattern film-type recording member: The recording member 20, which is formed of a pattern film (not shown) having a 50 µm polyethylene terephthalic acid (TETRON film H7W manufactured by TEJIN LIMITED) characters or pictures (not shown) and transparent conductive ink (Sumitomo) A product manufactured by Cement, I-201), written or painted on its surface.

The use of the pattern film made it possible to easily record and display images of characters and patterns on the board screen 29 at the same time.

Handwriting brush type recording member: As the recording member 20, the above-described conductive sponge (MOSPAC P manufactured by FUJIMORI KOGYO Co., Ltd.) was formed in a cone shape to provide a handwriting brush type recording tool.

The use of these tools made it possible to narrow or widen the traces of the recorded image as if written in a handwriting brush.

(d) Erasing the recorded image: In erasing, the image 30 recorded on the board screen has traces on the above-described erasing member 27 while the erasing switch is pressed. As a result, the electrostatic charges on the recorded image 30 are removed, so that it is easy to erase only the desired portion.

(e) safety

In the board set of this embodiment, by pressing the recording switch 28, the contacts (a) 16 of the recording switch are connected, which will electrically connect the terminal 14 to the recording member 20. FIG.

As a result, a voltage is generated between the conductive layer 3 and the recording member 20 to enable recording and / or drawing operations on the liquid crystal board 1. At the same time, the contacts (B) 22 of the recording switch and the contacts (a) 24 of the erasing switch are unconnected, respectively, so that the erasing member 27 is electrically disconnected from the terminal 10.

Therefore, no voltage is generated between the recording member 20 and the inside of the erasing portion 27 while the recording switch 28 is pressed.

Therefore, the electric shock was not felt by the operator when the operator touched the recording member 20 and the erasing member 27 by hand while the operator pressed the recording switch 28.

While the erasing switch is pressed, the contacts (a) 24 of the erasing switch are brought into a connected state, and this is the conductive layer 3 connected with the erasing member 27 so that these two portions are coincident.

As a result, the electrostatic charges in the recorded image portion can be removed by rubbing the board screen 29 with the erasing member 27 so that the recorded image 30 can be erased.

On the other hand, the contacts (a) 16 of the recording switch and the contacts (b) 18 of the erasing switch are unconnected, respectively, and the recording member 20 is electrically disconnected from the terminal 14. to be.

Therefore, no voltage is generated between the recording member 20 and the erasing member 27 while the erasing switch 31 is pressed.

Therefore, the operator does not feel an electric shock when the operator touches the recording member 20 and the erasing member 27 by hand while the erasing switch 31 is pressed.

When both the recording switch 28 and the erasing switch 31 are pressed at the same time, the contacts b and 18 of the erasing switch and the contacts b and 22 of the recording switch are disconnected. .

Thus, electrical disconnection lasts between the terminal 14 and the recording member 20 and between the terminal 10 and the erasing member 27, respectively.

Therefore, no voltage is generated between the recording member 20 and the erasing member 27 while the two switches are pressed simultaneously.

Accordingly, the operator did not feel an electric shock when the operator touched the recording member 20 and the erasing member 28 by hand while the operator pressed both of the recording switch 28 and the erasing switch 31 at the same time.

In addition, when the operator touched both the board screen 29 and the erasing member 27 filled with the operator's hand at the same time, the electric shock was not felt.

This is because the presence of resistors 25 and 13 between the erasing member 27 and the conductive layer blocks at most 30 mA of current between the erasing member 27 and the board screen 29.

In addition, the present consideration is made when the conductive layer 3 of the liquid crystal board is exposed to the outside.

In this case, the operator did not feel an impact when two parts of the recording member 20 and the exposed conductive layer 3 were simultaneously touched by the operator's hand.

This is because the presence of the resistors 13 and 11 between the conductive layer 3 and the power source 9 blocks at most 30 mA of current between the recording member 20 and the conductive layer 3.

(f) power saving

In the board set of this example, an automatic power interruption device is provided.

Therefore, if the power supply switch is turned on in the handwritten liquid crystal board set, power is automatically cut off after a predetermined period, thereby avoiding waste of electrical energy.

In this way, the power-saving hand-held liquid crystal board set can be repeatedly executed from the outside of the board screen in a simple manner in the display and erasing operation, and it is so highly stable that it is assured that it is not harmed by electric shock under any circumstances of the operator's use. It is finished.

Example 2

This will be described with reference to FIGS. 5 and 7.

(a) Provision of an External Rechargeable Liquid Crystal Display Device The external liquid crystal display device 1 was provided in the same manner as described in the first embodiment.

The volume resistivity of the following layers was obtained by similar measurements of Example 1.

Transparent high resistance layer 1.5 × 10 ¹⁴ 14cm

Liquid Crystal Dispersion Polymerization Layer 7.4 × 10 ¹⁴ Ωcm

(b) Providing a cordless handheld liquid crystal board set: The cordless handheld liquid crystal board set is a liquid crystal board (1). Was provided.

The conductive layer 3 of the external rechargeable liquid crystal board 1 uses a 1.5 V type battery which is not described through a series resistance 11 of 10 kV, a conducting wire 12, and another 10 kV of another resistor 13. It was connected to one terminal 10 of a DC power supply generating a voltage of 600V between the terminals.

The other terminal 14 of the power supply 9 is a series lead 15, a contact (a) 16 of a recording switch, a lead 17, a contact (b) 18 of a switch for erasing, a switch for recording. Was connected to the conducting wire 19 at the contact surface electrode 32 of.

The contact type surface electrode 33 of the erasing switch includes the series conducting wire 21, the contact of the recording switch (b) 22, the conducting wire 23, the contact of the erasing switch (a) 24, and 10 ㏁. The resistor 25 was connected via the conductive wires 26 to 12. The recording member 20 and the erasing member 27 were provided separately.

The recording member 20 is made of a conductive sponge (MOSPAC P manufactured by FUJIMORI KOGYO Co., Ltd.) having a volume resistivity of 4 × 10 ⁴ Pa · cm at 23 ° C. atmosphere and 50% RH.

On the other hand, the erasing member 27 is made of a conductive sponge (product MOSPAC CS manufactured by FUJIMORI DOGYO) having a volume resistivity of 4 × 10 ³ Pa · cm at 23 ° C. atmosphere and 50% RH.

A timer circuit (not shown) with a cut-off time of about 5 minutes is embodied as an automatic shutoff device between the U-3 type 1.5V battery and the power source 9.

The recording switch 28 includes contacts (a) 16 and contacts (b) 22 connected to each other to form an interlock mechanism.

The erasing switch 31 includes contacts (b) 18 and contacts (a) 24 connected to each other to form an interlock mechanism.

Normally, the contacts (b) 18 of the erasing switch and the contacts (b) 22 of the recording switch are connected to each other, while the contacts (a) 16 of the recording switch and the erasing switch are The contacts (a) 24 are in a disconnected state, respectively.

As described so far, the hand-written liquid crystal board set of this embodiment has been provided.

(c) Recording operation: by pressing the recording switch 28 with the left hand (by touching the contact type surface electrode 32 of the recording switch), the operator has a board screen with the recording member 20 held in the right hand. (29) Draw a line on it.

The recorded image 30 is thus obtained.

(d) Erasing operation: By pressing the erasing switch 31 with the left hand (touching the contact type surface electrode 33 of the erasing switch), the operator records the image recorded by the erasing member 27 held by the right hand. Mute the image by tracking.

When recording and erasing, not only the operator's body but also the contact type surface electrode 32 of the recording switch to the recording member 20 and the contact type surface electrode 33 of the erasing switch to the erasing member 27 are electrically connected. Play a role to be.

(e) safety

In the board set of this embodiment, the recording switch 28 electrically connects the terminal 14 to the contact type surface electrode 32 of the recording switch, with the contacts (a) 16 of the recording switch connected. do.

As a result, voltage is generated between the conductive layer 3 and the contact surface electrode 32.

At this time, the contact type surface electrode 32 and the recording member 20 held in the hand are connected through the human body so that the contact type surface electrode 32 becomes coincidence with the recording member 20.

As a result, during normal writing operation, a voltage is generated between the conductive layer 3 and the recording member 20 to enable writing and drawing operations on the liquid crystal board 1.

On the other hand, the contacts (b) 22 of the recording switch and the contacts (a) 24 of the erasing switch are unconnected, respectively, so that the contact type surface electrode 33 of the erasing switch is separated from the terminal 10. Electrically disconnected.

Therefore, no voltage is generated between the contact type surface electrode 32 of the recording switch and the contact type surface electrode 33 of the erasing switch while the recording switch 28 is pressed.

Therefore, the operator did not feel an electric shock when the operator touched the contact type surface electrode 33 of the recording switch while pressing the recording switch 28.

By pressing the erasing switch 31, the contacts (a) 24 of the erasing switch are brought into a connected state, and are electrically connected to the contact type surface electrode 33 of the switch for erasing the conductive layer.

At this time, the contact type surface electrode 33 and the eliminating member 27 held in the hand are connected through the human body, so that the contact type surface electrode 33 becomes coincidence with the eliminating member 27.

As a result, during the normal erasing operation, the conductive layer 3 and the erasing member 27 are coincident.

Therefore, the electrostatic charges in the recorded image portion are removed by tracking the board screen 29 with the erasing member 27, thereby enabling erasing of the recorded image 30. FIG.

On the other hand, the contacts (a) 16 of the recording switch and the contacts (b) 18 of the erasing switch are unconnected, respectively, so that the contact type surface electrode 32 of the recording switch is connected to the terminal 14. Electrically connected from

Therefore, no voltage is generated between the contact type surface electrode 32 of the erasing switch and the contact type surface electrode 32 of the recording switch while the erasing switch 31 is extended.

Therefore, the operator does not feel an electric shock when the operator presses the erasing switch and simultaneously touches the contact type surface electrode 32 of the recording switch.

When both the recording switch 28 and the erasing switch 31 are pressed at the same time, the contacts b and 18 of the erasing switch and the contacts b and 22 of the recording switch are disconnected.

Thus, electrical disconnection is maintained between the terminal 14 and the contact surface electrode 32 of the recording switch and between the terminal 10 and the contact surface electrode 33 of the erasing switch, respectively.

Therefore, the operator does not feel an electric shock when the operator presses both the recording switch 28 and the erasing switch 31 at the same time.

This is because voltage does not occur between the contact type surface electrode 32 of the recording switch and the contact type surface electrode 33 of the erasing switch.

Nevertheless, the operator does not feel an impact when both the charged board screen 29 and the contact type surface electrode 33 of the erasing switch are simultaneously touched by the operator's hand.

This means that the presence of the resistors 25 and 13 between the contact type surface electrode 33 and the conductive layer 3 of the erasing switch has a resistance of 30 m or less and the contact type surface electrode 33 and the board screen of the erasing switch. This is because the current between (29) is blocked.

Moreover, the invention is made for the case where the conductive layer 3 of the liquid crystal board 1 is exposed to the outside.

In this case, the operator does not feel an impact when the contact type surface electrode 32 and the exposed conductive layer 3 portion of the recording switch are simultaneously touched by the operator's hand.

This is because the presence of resistors 13 and 11 between the conductive layer 3 and the power source 9 causes a current of 30 mA or less between the contact type surface electrode 32 and the conductive layer 3 of the recording switch. It is because it stops.

(f) power saving

In the board set of this example, an automatic power cutoff device is provided.

Therefore, if the power supply switch is turned on in the handwritten liquid crystal board set, the power supply is automatically cut off after a predetermined period to avoid waste of electrical energy.

As such, the power-saving hand-held liquid crystal board set is repeatedly executed from the outside of the board screen in a simple manner in which display and erasing operations are completed. With high safety, the electrical shock does not hurt the operator under any environment of use. Do. Also, because this set does not use code, it has high persistence without problems such as code entanglement or disconnection.

Example 3

(a) Providing an externally charged liquid crystal display device: The externally charged liquid crystal display device 1 has a 2 μm-thick polyethylene terephthalic acid film (produced by Diafoil, KX42-42.0W) in Example 1 with the same conductive layer (3). It was laminated as a transparent high-electromagnetic resistance layer above, but provided in a similar manner as in Example 1.

The volume resistivity of the following layers was obtained by similar measurements as in Example 1.

Transparent high resistance layer 7.5 × 10 ¹⁴ Ωcm

(b) Provision of a Handwritten Liquid Crystal Board Set: A handwritten liquid crystal board set was provided in the same manner as in Example 1 using the externally charged liquid crystal display device as the liquid crystal board 1 above.

Example 4

(a) Provision of an external rechargeable liquid crystal display device: An external rechargeable liquid crystal display device 1 was provided in a manner similar to that of the first embodiment.

The solution having the following composition was added on the surface of the transparent insulating layer 8 of the apparatus as a dustproof film (not shown) to be 3 탆 thick after drying.

The solution was then dried and cured.

Polyol (CEFRAL COAT A-201TB manufactured by CENTRAL GALSS) Hexamethylene diisocyanate isocyanuric acid (polyisocyanate manufactured by CENTRAL GALSS) 1.0 g ethyl acetate 16.0%

(b) Provision of a Handwritten Liquid Crystal Board Set: A handwritten liquid crystal board set was provided in the same manner as in Example 1 using the externally charged liquid crystal display device as the liquid crystal board 1 above.

Comparative Example 1

(a) Provision of an external rechargeable liquid crystal display device: In an external rechargeable liquid crystal display device 1, a transparent high electromotive resistance layer 4 is not provided on the same conductive layer 3 as that of the first embodiment, but the first embodiment It was provided in a similar way.

(b) Provision of a Handwritten Liquid Crystal Board Set: A handwritten liquid crystal board set was provided as the same method in Example 1 using the above external charging type liquid crystal display device as the liquid crystal board 1.

Comparative Example 2

(a) Provision of an external rechargeable liquid crystal display device: A mixture of the following composition was added to the same conductive layer 3 as that of Example 1.

9 μm thick polyethylene terephthalic acid filtrate (product of TEIJIN LIMITED, TETRON film F) was placed on the added film as a transparent insulating layer 8 and pressed.

The film surface of the device is exposed by the ultraviolet irradiation device for one minute so that photo-maturation occurs as the liquid crystal dispersion loading layer 7 is formed. Thus, an external rechargeable liquid crystal display device was provided.

Epoxyacrylic Acid (Product of Toagosei Chemical, ARONIX-210)

1.2 g

1.8 g of 2-ethylnuclear acrylate

Benzoin-isopropyl ether 0.06 g

7.0 g nematic liquid crystal (E7 manufactured by MERCK)

Old fine particles with diameter 12㎛ (MBX-12S manufactured by SEKISUI Plastics)

0.005g

Volume resistivity below the layer was obtained by similar measurements as in Example 1.

Liquid Crystal Dispersion Polymerization Layer 5.6 × 10 ⁹ Ωcm

(b) Provision of a Handwritten Liquid Crystal Board Set: A handwritten liquid crystal board set was provided as the same method as in Example 1 using the externally charged liquid crystal display device as the liquid crystal board 1 above.

Comparative Example 3

(a) Provision of an external rechargeable liquid crystal display device: An external rechargeable liquid crystal display device (1) is provided in a similar manner as in Example 1, which is a polyvinyl alcohol solution (a product manufactured by Nippon General Rapid, Inc., Gohsenol). GH-17) was dried and dried at the place of the transparent high electromotive resistance layer 2 so as to have a thickness of 2 탆 after drying.

The volume resistivity of polyvinyl alcohol was 2.1 * 10 <^11> Pa * at 20 degreeC atmosphere and 90% RH.

(b) Provision of a hand-written liquid crystal board set: The hand-written liquid crystal board set was provided as the liquid crystal board 1 as the same method as in Example 1 by using the external charging type liquid crystal display device above.

[Comparative Example 4]

(a) Provision of an Externally Chargeable Liquid Crystal Display: An externally charged liquid crystal display was provided in a similar manner to Example 1, although no transparent insulating layer 8 was provided.

(b) Provision of a hand-written liquid crystal board set: The hand-written liquid crystal board set was provided as the liquid crystal board 1 as the same method as in Example 1 by using the external charging type liquid crystal display device above.

The following paragraphs examined each handwritten liquid crystal board set of the above examples and comparative examples.

(1) Recording performance: Each handwritten liquid crystal board set was kept in an environment having an atmosphere of 20 ° C. and a relative humidity (abbreviated RH) 90% in order to absorb moisture.

With each of these damp sets, the operator drew an image 30 to be recorded on the board screen 29 with the recording member 20 while the recording switch 28 was pressed.

The density difference between the image and non-image regions was measured using a Macbeth density meter (RD-915 type).

Good: The difference between 0 and D values is 0.4 or more between the video and non-video areas.

Poor: The difference of 0.D value between video and non-image areas is less than 0,4.

(2) Video storage memory performance

Each handwritten liquid crystal board set having an image 30 was kept at 20 ° C. atmosphere at 90% RH, and the memory storage time of the recorded image 30 was measured.

Good: The image is maintained for more than 0.4 minutes with a difference of 0.D between the video and non-image areas lasting more than 0.4.

Normal: The image is maintained for at least 10 minutes and less than 30 minutes with a difference of 0.D between the video and non-image areas lasting more than 0.4.

Poor: The image is maintained for less than 10 minutes with a difference of 0.D between the video and non-image areas lasting more than 0.4.

(3) elimination ability

Each handwritten liquid crystal board set was maintained at 20 ° C. air at 90% RH to absorb moisture.

With each of these moist sets, the operator draws an image 30 to record on the board screen 29 with the recording member 20 while the recording switch 28 is pressed.

The image 30 thus recorded is erased by tracking the image 30 recorded by the erasing member 27 while the erasing switch 31 is pressed.

Good: The erased image area is not visible at all (0.D value of the erased area is less than 0.05 plus 0.D value of the non-image area).

Poor: The collected area is clearly visible (0.D value of erased area adds 0.05 or more of 0.D value of non-image area).

(4) the strength of the board

Each liquid crystal board was rubbed on the surface with a material having a pencil strength of 2H, and damage was observed.

Good: No damage.

Poor: The liquid crystal dispersion polymerized layer is peeled off and damaged.

(5) Dust prevention performance

Each of the handwritten liquid crystal board sets had a room environment for about one month while the recording and erasing operations were repeated.

Thereafter, the above terms image archiving performance (2) and erasing ability (3) were reviewed.

Good: No degradation in image storage memory performance and erasing ability.

Poor: Deterioration of image storage memory performance and erasing ability.

The results of the review are shown in Table 1.

Claims (12)

The conductive layer, a transparent high electromotive resistance layer having a volume resistivity of 10 ¹³ Pa.cm or more in an atmosphere of 90% relative humidity and 20 ° C, and the liquid crystal are finely dispersed in the polymerization matrix, and are in a relative humidity of 90% and 20 ° C. A liquid crystal display device comprising a liquid crystal dispersion polymerization layer having a volume resistivity of 10 ¹³ Pa · cm or more, a transparent insulating layer, and all of the above layers in successive layers. The liquid crystal display of claim 1, wherein the high electron resistance layer comprises a polymer or a film having a crosslinked structure. The external charging liquid crystal display device according to claim 1, wherein the polymerization matrix of the liquid crystal dispersion polymerization layer is made of a polymer having a crosslinked structure. (A) Conductive layer, a transparent high electroconductivity layer having a volume resistivity of 10 ¹³ Pa · cm or more in an atmosphere of 90% relative humidity and 20 ° C., and liquid crystals are finely dispersed in the polymerization matrix, and the relative humidity is 90% and 20%. An external, chargeable liquid crystal board composed mainly of a liquid crystal dispersion polymerized layer having a volume resistivity of 10 ¹³ Pa · cm or more in the atmosphere and a transparent insulating layer, wherein all the layers are sequentially formed of layers; B) display means for displaying an image to be recorded on the board surface of the liquid crystal board, erasing means for erasing the recorded image, and (C) between the surface of the liquid crystal board and the conductive layer by the display means. A power source for generating a surface potential of the power source; wherein the display means uses a recording member electrically connected to one terminal of the power source connected to the other terminal of the conductive layer; Can fill the liquid crystal board set being characterized by using the erasing member electrically connected to the layer. 5. The liquid crystal board set according to claim 4, wherein the high electrical resistance layer includes a polymer or a film having a crosslinked structure. The hand-made liquid crystal board set according to claim 4, wherein the polymerization matrix of the liquid crystal dispersion polymerization layer is made of a polymer having a crosslink. 5. The method of claim 4, wherein both the power supply electrically connecting the power supply to the recording member, the recording member itself, the conductive wire electrically connecting the conductive layer to the erasing member, and the erasing subsidiary itself are 50% relative humidity. A hand-written liquid crystal board set having a volume resistivity of 10 ¹³ Pa · cm or less at ° C. 5. The electrical resistance of claim 4 wherein the electrical resistance of 200 kV to 100 kW is electrically connected at least between one terminal of the power source and the conductive layer, between one terminal of the power source and the erasing member and between the conductive layer and the erasing member. Set of handwritten liquid crystal boards characterized by 5. The handwritten liquid crystal board set according to claim 4, wherein the electric circuit including the display means and the erasing means includes an interlock device to prevent the occurrence of electric shock. 5. The handwritten liquid crystal board set according to claim 4, wherein the electric circuit including the display means and the erasing means comprises an automatic power cut-off device. 5. The handwritten liquid crystal board set according to claim 4, wherein the board surface of the board or the recording member and the erasing member require a dust prevention process. 5. The handwritten liquid crystal board set according to claim 4, wherein the recording member and / or the erasing member includes a substrate such as a film or a sheet having a pattern of conductive material formed thereon.