JPH08271857A - Charging type pen for liquid crystal board and handwriting liquid crystal board set provided therewith - Google Patents

Abstract

PURPOSE: To provide a charging type pen for a liquid crystal board which can be charged and by which writing is executed like using a nib-pen. CONSTITUTION: This charging type pen for a liquid crystal board 1 is produced by inserting and fixing a tip 2 for writing a recorded image on the screen of the liquid crystal board and made of conductor sponge to one opening part of a connector 3 made of insulating material, and then inserting and fixing a pen main body 5 held with a hand in the case of writing and made of the conductor material to the other opening part of the connector 3. Furthermore, the tip 2 and the pen main body 5 are connected by a capacitor 4 and a resistor 6 inside the pen 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable pen used for an externally charged liquid crystal board and a handwritten liquid crystal board set equipped with the pen. More specifically, the present invention relates to a charging device connected to a power supply device and the above charging. The present invention relates to a rechargeable pen for a liquid crystal board, which allows a user to write on the board screen of a liquid crystal board with a pen as if it were a pen, and a handwritten liquid crystal board set including the rechargeable pen.

[0002]

2. Description of the Related Art Conventionally, many display devices using a liquid crystal display element utilizing the electro-optical effect of liquid crystal have been proposed. Among them, a liquid crystal display element having a liquid crystal dispersion polymer layer in which liquid crystal is finely dispersed in a polymer matrix is excellent in that a large-sized board screen can be obtained with a simple structure, and a liquid crystal display device using the same has been proposed. . For example, in Japanese Unexamined Patent Publication No. 5-224182, an external charge is formed by sequentially laminating a transparent high electric resistance layer, a liquid crystal dispersed polymer layer in which liquid crystal is finely dispersed in a polymer matrix, and a transparent insulating layer on a conductive layer. Type liquid crystal display device is disclosed.

Further, Japanese Patent Laid-Open No. 5-281530 discloses a writing means for applying an electrostatic charge from the outside onto the surface of a transparent insulator layer using the above-mentioned liquid crystal display element, and a writing means on the surface. Erasing means for removing the electrostatic charge of
Disclosed is a handwritten liquid crystal board set equipped with a power source for generating a surface potential on the surface of the transparent insulator layer, and according to the publication, the writing means or the erasing means of the transparent insulator layer By applying or removing an electrostatic charge on the surface, the image can be repeatedly written or erased on the screen.

[0004]

However, the writing means used in the conventional handwritten liquid crystal board described above does not have a charging function, and therefore, the writing means is used for writing on the board screen of the handwritten liquid crystal board. Means to electrically connect an output terminal having a charge opposite to that of the output terminal of the power supply device connected to the conductive layer of the externally charged liquid crystal display element and the writing means, or to perform the writing while the writing is performed. I had to keep touching. That is, a rechargeable pen for a liquid crystal board that can be recharged and that can be written by immersing the pen in an ink bottle and writing on a paper as if writing with a pen, and a handwritten liquid crystal board set including the same have not been proposed yet. .

The present invention has been made to solve the above-mentioned conventional problems, and provides a rechargeable pen for a liquid crystal board which is rechargeable and can be written like a pen, and a handwritten liquid crystal board set including the same. The purpose is to provide.

[0006]

The present invention provides a chip made of a conductive material for writing a recorded image on a board screen of a liquid crystal board, and a pen body made of a conductive material that is gripped by hand during writing. A rechargeable pen for a liquid crystal board, comprising: a connector made of an insulating material for connecting the chip and the pen body, wherein the chip and the pen body store an electric charge inside the pen. The present invention relates to a rechargeable pen for a liquid crystal board, which is connected by means.

The present invention also includes (A) a conductive layer and an air temperature of 2
Volume resistivity is 10 ¹³ Ω at 0 ° C and 90% relative humidity.
A transparent electric resistance layer having a size of at least cm, and a liquid crystal dispersion polymer layer having a liquid crystal finely dispersed in a polymer matrix and having a volume resistivity of at least 10 ¹³ Ωcm at a temperature of 20 ° C. and a relative humidity of 90%. , Relative humidity 90% at 20 ℃
Of the external charge type mainly composed of a liquid crystal sheet in which a transparent insulator layer having a volume resistivity of 10 ¹³ Ω · cm or more is sequentially laminated, and a conductive member electrically connected to the conductive layer. A liquid crystal board; (B) a chip made of a conductive material for writing a recorded image on the board screen of the liquid crystal board; a pen body made of a conductive material that is gripped by hand during writing; A rechargeable pen for a liquid crystal board, comprising: a connector made of an insulating material for connecting to a pen body, wherein the chip and the pen body are connected to each other by a storage means for accumulating electric charge inside the pen. A chargeable pen for a liquid crystal board, (C) an erasing member made of a conductive material for erasing a recorded image written on the board screen by the chargeable pen for a liquid crystal board, and (D)
By inserting the charging pen for the liquid crystal board, a charging device having a tip electrode part with which the chip of the pen contacts, (E) an output terminal connected to the tip electrode part of the charging device, And a power supply unit having another output terminal connected to the conductive layer of the liquid crystal board.

Further, according to the present invention, (A) the conductive layer has a volume resistivity of 10 ¹³ at a temperature of 20 ° C. and a relative humidity of 90%.
A transparent electric resistance layer having a resistance of Ω · cm or more, and a liquid crystal dispersion polymer layer in which liquid crystal is finely dispersed in a polymer matrix and has a volume resistivity of 10 ¹³ Ω · cm or more at a temperature of 20 ° C. and a relative humidity of 90%. And at a temperature of 20 ° C and a relative humidity of 90
% External charge type mainly composed of a liquid crystal sheet in which transparent insulating layers having a volume resistivity of 10 ¹³ Ω · cm or more are sequentially laminated, and a conductive member electrically connected to the conductive layer. Liquid crystal board, (B) a chip made of a conductive material for writing a recorded image on the board screen of the liquid crystal board, a pen main body made of a conductive material to be gripped by hand during writing, and the chip. A rechargeable pen for a liquid crystal board, comprising: a connector made of an insulating material for connecting to the pen body, wherein the chip and the pen body are connected to each other by a power storage means for accumulating charges inside the pen. A rechargeable pen for liquid crystal board, and (C) an erasing member made of a conductive material for erasing a recorded image written on the board screen by the rechargeable pen for liquid crystal board,
(D) By inserting the rechargeable pen for the liquid crystal board, the tip electrode part for contacting the tip of the pen and the pen body electrode part for contacting the pen body, and the pen are inserted into the cylinder. A charging device having a switch that is turned on by (E), (E) an output terminal connected to the tip electrode part of the charging device, and another output connected to the pen body electrode part of the charging device A handwritten liquid crystal board set comprising a terminal and a power supply device connected to the switch provided inside the charging device.

Generally, when a current flows through a human body, it is said that the current value without electric shock is 5 mA or less. Therefore, the output current value from the pen body is regulated to 5 mA or less for the storage means and the pen body. It is preferable to connect with a resistor. Further, instead of connecting the power storage means and the pen body by the above resistance, the pen body or the chip may be made of a conductive material having a resistance value that limits the output current value from the pen body to 5 mA or less. A capacitor may be used as the power storage means.

As described above, the external charge type liquid crystal board used in the handwritten liquid crystal board set of the present invention has a conductive layer and a volume resistivity of 10 ¹³ Ω · cm or more at a temperature of 20 ° C. and a relative humidity of 90%. The transparent electric resistance layer and the liquid crystal are finely dispersed in the polymer matrix, and the temperature is 20 ° C.
And volume resistivity at relative humidity of 90% is 10 ¹³ Ω · c
A liquid crystal sheet in which a liquid crystal dispersed polymer layer having a thickness of m or more and a transparent insulator layer having a volume resistivity of 10 ¹³ Ω · cm or more at a temperature of 20 ° C. and a relative humidity of 90% are sequentially laminated, and the conductive layer. And a conductive member electrically connected to the main component.

The conductive layer of the liquid crystal board may be either transparent or opaque and may be a layer having a surface resistance of 10 ⁷ Ω / □ or less. In practice, the surface of the substrate is aluminium, titanium, chromium, tin, rhodium, gold, stainless steel, titanium nitride, nickel-chromium, aluminum-
It is made conductive with chromium or indium tin oxide. The term "base material" as used herein holds a conductive layer, and specifically, paper, cloth, non-woven fabric, or polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyethylene, polyvinyl chloride, polysulfone, polyphenylene oxide, ionomer. Examples thereof include plastic films such as polyimide and polycarbonate. However, it is not particularly necessary when the conductive layer itself is a metal film.

The liquid crystal dispersed polymer layer of this liquid crystal board is
Liquid crystals are dispersed in a polymer matrix in the form of independent droplets. As a method for dispersing liquid crystal in a polymer matrix, a polymer-liquid crystal common solvent evaporation phase separation method (common solvent casting method), a polymerization phase in which a polymer precursor is polymerized from a liquid crystal-polymer precursor mixture by light or heat There are a separation method, a melt cooling phase separation method of cooling a liquid crystal and a polymer from a heated and molten state, a method of microcapsulating a liquid crystal and dispersing it in a polymer matrix, and these can be appropriately used.

As the polymer which can be used in the liquid crystal dispersed polymer layer, any polymer which is hardly compatible with the liquid crystal may be used. Specific examples thereof include vinyl resins such as chlorinated polyethylene, polypropylene, polystyrene and acrylic resin, vinylidene chloride resin and polyvinyl resin. Examples thereof include acetal resin, cellulose resin, ionomer, polyamide, polycarbonate, polyphenylene oxide, porsulfone, fluororesin, silicon resin, butadiene, styrene rubber, chlorosulfonated polyethylene, polyester and epoxy resin. Examples of the polyvinyl acetal resin include polyvinyl formal, polyvinyl acetal, polyvinyl butyral and the like.

Further, a polymer having a crosslinked structure (hereinafter referred to as a crosslinked polymer) is preferable as a polymer constituting the liquid crystal dispersed polymer layer. When the crosslinked polymer is used, the crosslinked polymer and the liquid crystal are completely incompatible with each other even in the high temperature state of the liquid crystal board of the present invention, and a stable liquid crystal fine dispersion structure can be maintained. Therefore, it is possible to obtain a liquid crystal board having durability with no performance deterioration even with time.

Examples of the crosslinked polymer include double bonds,
Obtained by reacting a polymer or silicone polymer having a functional group such as nitrile, mercapto, hydroxy, carboxy, epoxy, chlorine, fluorine, isocyanate, methoxy, amino, or chlorosulfone with a crosslinking agent that reacts with the functional group. And a crosslinked polymer obtained by mixing a reactive polymer with the above-mentioned functional group-containing polymer and reacting them.

As the crosslinking agent used in the above reaction, diisocyanate compound, organic peroxide, amine compound, aziridine compound, epoxy compound, dicarboxylic acid or carboxylic acid anhydride, formaldehyde, dialdehyde,
There are diols, bisphenols, silanol compounds, metal oxides, metal halides, photocrosslinking agents (photopolymerization initiators), etc., and reactive polymers include phenol resins, amino resins, polyisocyanates, polyols, epoxy resins, etc. .

Preferred crosslinked polymers are di- or polyisocyanates, polyvinyl acetal resins,
Examples thereof include crosslinked polymers obtained by reacting with a polymer such as an epoxy resin, an acrylic resin having a functional group such as a hydroxy group and a carboxy group, a polyester resin, a fluororesin and the like. A more preferable crosslinked polymer is a crosslinked polymer obtained by reacting di- or polyisocyanate with a polyvinyl acetal resin. Here, the polyvinyl acetal resin is polyvinyl formal, polyvinyl acetal, polyvinyl butyral, or the like. The crosslinked polymer is a mixture of the above two components,
After adding a solvent as needed, dry heating (20 to 100
℃).

The liquid crystal used in the liquid crystal dispersed polymer layer is preferably a nematic liquid crystal having a positive dielectric anisotropy, and the liquid crystal phase is −10 ° C. to 100 ° C. for practical use as a board set.
It is preferable that the birefringence Δn is 0.2 or more in order to display the recorded image clearly in the temperature range of ° C.

The volume resistivity of the liquid crystal dispersion polymer layer of the liquid crystal board has a relative humidity of 90% (hereinafter, 90% RH) at a temperature of 20 ° C.
Abbreviated) at 10 ¹³ Ω · cm or more in it is desirable. As a result, the contour of the recorded image is clear even under the environment of the temperature of 20 ° C. and 90% RH, and the memory property, erasability, durability and the like are improved. The reason is that the applied electrostatic charge is not easily moved and attenuated and thus is held for a long time, and the contour of the recorded image is not blurred even after a lapse of time and is kept clear. Further, since the applied electrostatic charge is less likely to move and attenuate even at the top and bottom of the board screen, the erasability is improved. However, if the volume resistivity is less than 10 ¹³ Ω · cm, the applied electrostatic charge easily moves and decays on the plane and the top and bottom of the board screen, and the static charge disappears and decays over time and the plane and top and bottom of the board screen. In this case, the electrostatic charge becomes unbalanced, and as a result, the contour of the recorded image, the memory property and the erasability are deteriorated.

The transparent insulator layer of the liquid crystal board is composed of a transparent polymer having a high electric resistance. Preferably, the transparent polymer has a volume resistivity of 10 ¹³ Ω · cm or more at a temperature of 20 ° C. and 90% RH, and examples thereof include polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyethylene, polyvinyl chloride, polysulfone,
Examples thereof include polyphenylene oxide, ionomer, polycarbonate, nylon, fluororesin, and mixtures thereof. The transparent insulator layer may be formed by laminating a film made of the above material with an adhesive or an adhesive, applying a solution of a material having the above physical properties, drying it, or reacting it after applying a reactive material solution. can get. If a transparent insulator layer having a volume resistivity of less than 10 ¹³ Ω · cm at a temperature of 20 ° C. and a relative humidity of 90% is used, a problem in performance occurs due to the same reason as that of the liquid crystal dispersion polymer layer, and a practical liquid crystal is used. Not a board.

The transparent high electric resistance layer of the liquid crystal board is provided between the conductive layer and the liquid crystal dispersed polymer layer. Its volume resistivity is 10 ¹⁸ Ω · cm or more at a temperature of 20 ° C. and 90% RH. This layer more reliably prevents migration and attenuation of the electrostatic charge applied to the board screen, and thus improves performance such as sharpness of contour of recorded image, memory property, and erasability.
Volume resistivity is 10 ¹³ Ω at a temperature of 20 ° C and 90% RH.
If a material having a size of less than cm is used, it causes a problem in performance for the same reason as that of the liquid crystal dispersion polymer layer and is not practical.

Polymers used for the transparent high electric resistance layer include chlorinated polyethylene, polypropylene, polystyrene, vinyl resins such as acrylic resin, vinylidene chloride resin, polyvinyl acetal resin, cellulose resin, ionomer, polyamide, polycarbonate, polyolefin oxide, polyethylene. , Polyphenylene oxide, polysulfone, fluororesin, silicon resin, butadiene, styrene rubber, chlorosulfonated polyethylene,
Examples thereof include polyester and epoxy resin. here,
The polyvinyl acetal resin is polyvinyl formal, polyvinyl acetal, polyvinyl butyral, or the like.

Further, the following crosslinked polymers can also be used as the polymer used for the transparent high electric resistance layer, for example, double bond, nitrile, mercapto, hydroxy, carboxy, epoxy, chlorine, fluorine, isocyanate, methoxy, A cross-linking polymer obtained by mixing a cross-linking agent that reacts with a functional group into a polymer having a functional group such as amino or chlorosulfone or a silicone polymer, or mixing a reactive polymer into the above-mentioned polymer having a functional group. And a cross-linked polymer obtained by the reaction.

As the cross-linking agent used in the above reaction, diisocyanate compound, organic peroxide, amine compound, aziridine compound, epoxy compound, dicarboxylic acid or carboxylic acid anhydride, formaldehyde, dialdehyde,
There are diols, bisphenols, silanol compounds, metal oxides, metal halides, photocrosslinking agents (photopolymerization initiators), etc., and reactive polymers include phenol resins, amino resins, polyisocyanates, polyols, epoxy resins, etc. .

Preferred crosslinked polymers include di- or polyisocyanates, polyvinyl acetal resins,
Examples thereof include crosslinked polymers obtained by reacting with a polymer such as an epoxy resin, an acrylic resin having a functional group such as a hydroxy group and a carboxy group, a polyester resin, a fluororesin and the like. A more preferable crosslinked polymer is a crosslinked polymer obtained by reacting di- or polyisocyanate with a polyvinyl acetal resin. Here, the polyvinyl acetal resin is polyvinyl formal, polyvinyl acetal, polyvinyl butyral, or the like.

The transparent high electric resistance layer can be obtained by applying a layer material solution or reacting after applying a reactive material solution. Alternatively, the film having high electric resistance can be obtained by laminating it with a pressure sensitive adhesive or an adhesive.
The thickness of the transparent high electric resistance layer is preferably in the range of 0.4 to 10 μm. Examples of the reactive material include, for example, a di- and polyisocyanate compound as a cross-linking agent, and a compound that reacts with the cross-linking agent is polyvinyl alkyl, epoxy resin,
Acrylic resin containing carboxyl group, polyester resin,
There are fluororesins.

It is also possible to obtain a film having a high electric resistance as a transparent high electric resistance layer by laminating it with an adhesive or an adhesive. High electrical resistance films include polyethylene terephthalate, polyethylene naphthalate,
Films such as polypropylene, polyethylene, polyvinyl chloride, porsulfone, polyphenyl oxide, ionomer, polycarbonate, nylon and fluororesin, and silicon dioxide film.

The liquid crystal board of the present invention uses a conductive member that fixes the liquid crystal sheet and is electrically connected to the conductive layer of the liquid crystal sheet. The electrically conductive member here means an electrically conductive material having a volume resistivity of 10 ¹² Ω · cm or less at a temperature of 23 ° C. and 50% RH. For example, conductive paper, cloth,
Nonwoven fabrics, conductive rubbers, conductive sponges, conductive plastics, conductive polymers such as polypyrrole, polythiophene and polyaniline, metals, alloys, metal oxides and the like can be used as the material of the conductive member. Since the conductive member is electrically connected to the conductive layer, it serves as a conductive wire when writing on the board screen with the liquid crystal board pen and when erasing the display image using the erasing member.

In the liquid crystal board of the present invention, the substrate is used to hold the liquid crystal sheet. Examples of the substrate material include chlorinated polyethylene, polypropylene,
Polystyrene, vinyl resin such as acrylic resin, vinylidene chloride resin, polyvinyl acetal resin, cellulose resin, ionomer, polyamide, polycarbonate, polyphenylene oxide, polysulfone, fluororesin,
Hard plastic plates such as silicon resin, chlorosulfonated polyethylene, polyester, epoxy resin, glass,
Examples include metal and wood boards. By integrating the substrate made of these materials with the frame of the liquid crystal board set itself,
A simple liquid crystal board set can be manufactured.

In the liquid crystal board, when a dichroic dye is added to the liquid crystal dispersed polymer layer together with the liquid crystal, the color tone of the board screen is changed, and the conductive layer, the base material and the substrate are made transparent so that the outside of the substrate is covered. When a paper, plastic film, or the like is provided and used as the coloring layer, a board screen and image color of any color can be obtained, and clear contrast can be obtained.

Charging of the rechargeable pen for a liquid crystal board according to the present invention is performed as follows. First, one terminal of a power supply device capable of generating a surface potential of 50 V or more between a surface of a liquid crystal board and a conductive layer is connected to the conductive layer, and the other terminal is provided on a charging device for a chip electrode portion. Connect to. Then, the tip of the pen is brought into contact with the tip electrode portion and the pen body is connected to a conductive member that is electrically connected to the conductive layer for charging. Also, one terminal of the power supply device is connected to the pen body electrode portion provided in the charging device without connecting to the conductive layer. Charging is also performed by bringing the pen tip into contact with the tip electrode portion and the pen body into contact with the pen body electrode portion.

The recorded image of the handwritten liquid crystal board set according to the present invention is obtained as follows. A recorded image can be obtained by bringing the pen charged by the above-mentioned means into contact with the board screen of the liquid crystal board and electrically connecting the pen body and the conductive member. 50 on the board screen
When a surface potential of more than a volt is generated, the liquid crystal in the liquid crystal dispersed polymer layer is oriented by an electrostatic field and becomes transparent, and a transparent and high-contrast recorded image is obtained in a cloudy board screen. When the surface potential is less than 50 volts, the liquid crystal is not sufficiently oriented due to insufficient alignment, and thus the contrast of the recorded image is low.

The obtained recorded image is erased by the erasing member made of a conductive material as follows. That is,
The erasing member is electrically connected to the conductive layer and is electrically connected to the conductive member for fixing the liquid crystal sheet, and the erasing member is recorded on the board screen (substantially the surface of the transparent insulating layer).
When the recording image and the conductive layer are brought into contact with each other, the electrostatic potential of the recording image is easily removed and the recorded image is erased.

The tip of the rechargeable pen, the pen body, and the erasing member used in the liquid crystal board set of the present invention have a volume resistivity of 10 ¹² Ω at a temperature of 23 ° C. and 50% RH.
made of a conductive material having a size of 10 cm or less, preferably 10 ⁸
It is made of a conductive material of Ω · cm or less. 50 at 23 ° C
When displaying or erasing with a conductive material of 10 ¹² Ω · cm or less in% RH, the electrostatic charge can be smoothly applied to the board screen to align the liquid crystal, and the electrostatic charge can be easily removed to remove the liquid crystal. The orientation can be restored. Therefore, high-contrast display and smooth erasing can be easily performed. On the other hand, when the volume resistivity is higher than 10 ¹² Ω · cm, there are problems that the contrast of the recorded image is low, the response is bad, and the erasing is insufficient and therefore the erasing operation remains unerased.

Further, in the present invention, for example, a transparent recorded image is obtained in the cloudy board screen. However, an electrostatic charge is applied to the entire screen of the board with a liquid crystal board pen to orient the liquid crystal. By partially removing the electrostatic charges on the board screen with the erasing member, it is possible to obtain a cloudy recorded image in the transparent board screen.

As the conductive material forming the tip and pen body of the rechargeable pen used in the liquid crystal board set of the present invention and the erasing member, copper, iron, aluminum, tin, palladium, gold, silver, brass and stainless steel are used. And the like, metal 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.

Depending on the characteristics of the material, these materials may be directly processed into a wire (conductor), contact (terminal), conductive fiber, plastic film, fiber, non-woven fabric, rubber, sponge, glass, etc. The surface of the base material is processed into a conductive film, conductive fiber, conductive rubber, conductive sponge, conductive glass, or processed into fine particles or fibers and then kneaded into plastic, rubber, etc. It can be used in the form of conductive plastic, conductive rubber, conductive porous body, etc., which can be combined or further processed according to the purpose of use and used as a material for pens and erasing members. it can. In particular, if you use a pen tip made of a conductive fiber or a conductive elastic material in a writing brush type, you can obtain a recorded image that looks like it was drawn with a brush, such as making the recorded image's handwriting thicker or thinner. To be

The power supply device in the liquid crystal board set of the present invention is a DC power supply which has a potential of 50 V or more between the conductive layer and the tip of the pen and can generate a surface potential of 50 V or more on the board screen. Preferably, the power supply device is a blocking oscillation composed of a DC low-voltage power supply, a power switch, an oscillation transistor for boosting a low voltage generated from the DC low-voltage power supply, and a boosting oscillation transformer. A circuit, a rectifying diode for rectifying the voltage generated by the blocking oscillator circuit, a smoothing capacitor for charging the rectified voltage and smoothing an output voltage, a smoothing capacitor and an output terminal And a resistor that limits the output current value to 5 mA or less.

As the direct current low voltage power source, a dry cell, a solar cell or the like can be used as a power source, but a 1.5 V dry cell is preferable in view of easy availability and easy handling. The oscillating transistor, the boosting oscillating transformer, and the rectifying diode are generally provided on the market and are not special ones. Further, in the boosting oscillating transformer, the number of turns on the primary side and the number of turns on the secondary side are determined from the relationship between the input voltage and the output voltage to be obtained. As the smoothing capacitor, a capacitor having a capacity corresponding to the rectified voltage is used.

It is generally said that the current value at which no electric shock occurs when a current flows through the human body is 5 mA or less. Therefore, a resistor is connected in order to regulate the output current from the smoothing capacitor to 5 mA or less, and the resistor is preferably in the range of 200 KΩ to 100 MΩ in view of the relationship with each member described above.

Further, in the liquid crystal board set of the present invention, by providing an automatic power-off mechanism in the electric circuit of the power supply device, even if the power supply switch is left on, it is automatically switched after a certain period of time. Since it is disconnected, it can be a power-saving type that does not waste electricity.

By providing a switch that is turned on when the pen is inserted into the charging device, the power switch is turned on only during the time when the pen is inserted and charging is performed, and at other times. Since the power supply is switched off, it can be a power-saving type that does not waste electricity.

[0043]

According to the rechargeable pen for a liquid crystal board of the present invention, since a storage means for accumulating electric charges is provided inside the pen, the pen and the power supply device are electrically connected to each other when writing on the liquid crystal board. No need to connect. Further, according to the handwritten liquid crystal board set of the present invention, since the rechargeable pen and the charging device for the pen are provided, by writing on the board screen of the liquid crystal board with the pen charged by the charging device, An electrostatic charge is applied to the liquid crystal dispersed polymer layer of the liquid crystal board to display a recorded image. Further, according to the handwritten liquid crystal board set of the present invention, since the plus electrode and the minus electrode for charging the pen are provided in the charging device, the charging operation can be performed only by inserting the pen into the charging device. Be seen.

That is, since the liquid crystal of the liquid crystal dispersed polymer layer is finely dispersed in the polymer matrix and aligned along the polymer wall, light scattering occurs due to the difference in refractive index between the polymer and the liquid crystal when no electrostatic charge is applied. , The liquid crystal board is cloudy and opaque. However, when an electric field is applied to the liquid crystal-dispersed polymer layer through the transparent insulator layer with a charged pen, the liquid crystal is aligned in the direction of the electric field, and the refractive indices of the polymer and the liquid crystal are almost the same. As a result, light scattering does not occur and a transparent state is obtained, and a contrast is produced between the board screen and the recorded image, resulting in a display state. For erasing, the erasing member removes the electric field of the liquid crystal-dispersed polymer layer, so that the liquid crystal returns to the original state in which no electrostatic charge is applied.

[0045]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings, the same numbers are given to the same members and parts. Example 1 (a) Preparation of rechargeable pen for liquid crystal board: FIG. 1 is a schematic vertical sectional view showing one example of a rechargeable pen for liquid crystal board according to the present invention. As shown in FIG. 1, the purpose is to write a recorded image on the board screen of the liquid crystal board, and to insulate the chip 2 impregnated with a conductive resin having a volume resistivity of 10 kΩ · cm at a temperature of 23 ° C. and 50% RH. Inserted and fixed in one opening of the connector 3 made of material, and then held in the other opening of the connector 3 by hand during writing, and has a volume resistivity of 1 MΩ · cm at a temperature of 23 ° C and 50% RH. The rechargeable pen 1 for a liquid crystal board was manufactured by inserting and fixing the pen body 5 made of a conductive material. Further, inside the pen 1, the chip 2 and the pen body 5 were connected to each other by a capacitor 4 of 0.047 μF and a resistor 6 of 10 MΩ.

(B) Fabrication of Externally Charged Liquid Crystal Board: FIG. 2 is a schematic perspective view showing an embodiment of the handwritten liquid crystal board set according to the present invention, and FIG. 3 is a schematic view of the handwritten liquid crystal board set according to the present invention. It is a block diagram which shows one Example. Figure 2
Further, as shown in FIG. 3, the vapor-deposited aluminum layer of # 125 Metalmy TS (manufactured by Toyo Metalizing Co., Ltd .: an aluminum vapor-deposited film whose substrate 29 is a polyethylene terephthalate film) was used as the conductive layer 28.

Then, a solution having the following composition is applied onto the conductive layer 28, dried, and dried to a thickness of 3 μm.
The transparent high electric resistance layer 27 was formed by curing. Denka formal # 20 (manufactured by Denki Kagaku Kogyo Co., Ltd .: polyvinyl formal) 10% tetrahydrofuran solution 9.0 g Takenate D110N (manufactured by Takeda Pharmaceutical Co., Ltd .: polyisocyanate) 0.4 g

Further, on the transparent high electric resistance layer 27,
A solution having the following composition is applied, dried, and cured to give a dry film thickness of 7 μm, and polymer matrix 2
Liquid crystal dispersed polymer layer 24 in which liquid crystal droplets 26 are finely dispersed in 5
Was formed. Vinylec K-624 (manufactured by Chisso Corporation: polyvinyl formal) 10% tetrahydrofuran solution 4.2 g Takenate D110N (Takeda Chemical Industries, Ltd .: polyisocyanate) 0.56 g E44 (MERCK: nematic liquid crystal) 0.36 g

On the liquid crystal dispersed polymer layer 24, a transparent insulator layer 23 of 9 μm Tetron film F (manufactured by Teijin Ltd .: polyethylene terephthalate film) was laminated with an adhesive. Finally, as shown in FIGS. 2 and 3,
The liquid crystal sheet having the above structure was fixed, and the conductive member 13 was attached with an adhesive so as to be electrically connected to the conductive layer 28 of the liquid crystal sheet. The conductive member 13 is made of a conductive nonwoven fabric. Then, the liquid crystal sheet formed by laminating various layers as described above is ABS-coated with an adhesive.
It was fixed on a substrate 15 made of resin.

Further, the liquid crystal dispersed polymer layer 24 and the transparent high electric resistance layer 2 whose humidity is adjusted to 90% RH at the temperature of 20 ° C.
Regarding No. 7, a DC power source (manufactured by Trio Corporation: PR-63
0), electrometer (manufactured by Takeda Riken Kogyo Co., Ltd .:
When the volume resistivity was measured using a TR8651) and an insulation resistance measurement sample box (TR42, manufactured by Advantest Corporation), the following values were shown. Transparent high electric resistance layer 1.5 × 10 ¹⁴ Ω · cm Liquid crystal dispersed polymer layer 7.4 × 10 ¹⁴ Ω · cm

(C) Fabrication of charging device: As shown in FIGS. 2 and 3, the charging device 12 is a bottomed cylinder into which the pen 1 can be inserted, and the tip 2 of the pen 1 is inside the cylinder. The electrode part 20 for a chip to contact was provided.

(D) Fabrication of power supply device: FIG. 5 is a circuit diagram of the power supply device shown in FIG. The power supply device 11 of the present embodiment,
The circuit is configured as shown in the circuit diagram within the dotted line in FIG. In FIG. 5, reference numeral 41 is a DC low-voltage power source composed of a 1.5V alkaline battery, and 16 is a switch. Reference numeral 42 is a smoothing capacitor of 47 μF. Reference numeral 43 is an oscillation transistor. 44 is a resistance of 56 kΩ, and 45 is a resistance of 560 Ω. Reference numeral 46 is an oscillation capacitor of 0.22 μF. Reference numeral 47 is a boosting oscillating transformer having a winding ratio of about 1: 380. The blocking oscillating circuit is constituted by 42 to 47. 48 is a rectifying diode, and 49 is a smoothing capacitor of 330 pF. 41-49 and 16 at DC-
It constitutes a DC converter circuit. 50, 51 and 5
Reference numeral 2 is a resistor for controlling a current value of 5.1 MΩ. 21 and 2
2 is an output terminal.

The operation of the power supply device having the above configuration will be described below. When the power switch 16 is turned on, the DC low voltage power supply 41 is connected, and the base of the oscillation transistor 43 is biased via the resistor 44. The capacitor 42 is for stabilizing the voltage of the DC low voltage power supply 41. Step-up oscillation transformer 4 connected to the base side of the oscillation transistor 43
When a current flows through the primary winding of No. 7, the current flows through the primary winding of the boosting oscillation transformer 47 connected to the collector side of the oscillation transistor 43. Due to the rise in the collector current of the oscillation transistor 43, the boosting oscillation transformer 4 connected to the base side of the oscillation transistor 43.
Positive feedback is applied to the primary winding of the transistor 7, and the oscillation transistor 43 is turned on.

At some point, the oscillation transistor 4
The voltage applied to the primary winding connected to the collector of No. 3 decreases, and the saturation voltage between the collector and the emitter of the oscillation transistor 43 increases rapidly. As a result, the oscillation transistor 43 is turned off. At this time, a current is excited in the secondary winding of the boosting oscillating transformer 47 by the energy stored in the core of the boosting oscillating transformer 47.
As a result, a voltage is generated in the secondary winding of the boosting oscillation transformer 47. The voltage value to be generated is determined by the oscillation transformer 47 for boosting.
It is proportional to the number of turns of the primary winding and the secondary winding. This output voltage is half-wave rectified by the diode 48. The capacitor 49 is a smoothing capacitor.

Due to the backswing of the current excited in the secondary winding of the boosting oscillation transformer 47, the current is again excited in the primary winding of the boosting oscillation transformer 47 connected to the base side of the oscillation transistor 43. , The oscillating transistor 43 is switched on. Then, a current flows through the primary winding connected to the collector of the oscillation transistor 43. The resistor 45 and the capacitor 46 are for setting the oscillation time constant. Oscillation is repeated by repeating the above operation.

The voltage between the output terminals 21 and 22 was measured with the high voltage probe 9014 connected to the digital high tester 3231-01 manufactured by Hioki Electric Co., Ltd. while the power switch 16 was turned on. There was output voltage.

(E) Manufacture of a handwritten liquid crystal board set: One output terminal 22 of the power supply device 11 is connected to the conductive layer 28 of the external charge type liquid crystal board 10 via a lead wire 31, and the charging device 12 is charged. The other output terminal 21 of the power supply device 11 was connected to the chip electrode portion 20 via the lead wire 30 to produce a handwritten liquid crystal board set.

(F) Writing operation: First, the switch 16 of the power supply device 11 is turned on, the pen 1 is inserted into the barrel of the charging device 12 while holding the pen body 5 with one hand, and the tip 2 of the pen 1 is inserted. The insertion was continued until it came into contact with the chip electrode portion 20 in the charging device 12. At the same time, the other hand touched the conductive member 13 of the liquid crystal board 10. As a result, the pen body 5 and the conductive member 13 were electrically connected via the human body, and the pen 1 was charged. After charging pen 1
Was carried on the liquid crystal board 10, and while writing on the board screen 14 with the pen 1 while holding the pen body 5 with one hand. However, while writing with the pen 1, use the other hand to
The conductive member 13 of 0 was continuously touched. Therefore, the board screen 1
A surface potential was generated in the written portion of No. 4, and the liquid crystal 26 of the liquid crystal dispersed polymer layer 24 was oriented by the electrostatic field, and as a result, a recorded image was obtained.

(G) Erase operation: Erase member 17 with one hand
Holding the other hand with the other hand, the conductive member 13 of the liquid crystal board 10
I touched. In this state, when the recorded image is traced by the erasing member 17, the conductive layer 28 and the erasing member 17 are electrically at the same electric potential, and the electrostatic field applied between the surface of the liquid crystal board 10 and the conductive layer 28 is medium. After the addition and removal, the alignment of the liquid crystal molecules 26 in the liquid crystal dispersed polymer layer 24 disappeared, and only an arbitrary portion of the recorded image could be easily erased.

Further, in the handwritten liquid crystal board set of this embodiment, the transparent high electric resistance layer 27 of the liquid crystal board 10 prevents the movement of electrostatic charges, and a memory with a high display image even at 90% RH at a temperature of 20 ° C. The erasability and erasability were maintained. In this embodiment, in this manner, writing and erasing from the outside of the board screen 14 can be repeatedly and easily performed with a touch pen feel, and the performance such as memory property and erasability is maintained even in an environment of high humidity. We were able to obtain a high-quality handwritten LCD board set.

When the pen 1 was charged, the conductive member 13 and the pen body 5 were simultaneously brought into contact with the human body while the switch 16 was kept ON, but there was no electric shock. When the current flowing through the output terminal 21 was measured by the digital high tester 3231-01 described above, the current value was 1 μA.

Embodiment 2 FIG. 4 is a block diagram showing an embodiment of a handwritten liquid crystal board set according to the present invention. (A) Preparation of rechargeable pen for liquid crystal board: A rechargeable pen for liquid crystal board was prepared in the same manner as in Example 1. (B) Preparation of Externally Charged Liquid Crystal Board: An externally charged liquid crystal board was prepared in the same manner as in Example 1.

(C) Fabrication of charging device: As shown in FIG. 4, the charging device 62 of the present embodiment has a bottomed tubular shape into which the pen 1 can be inserted, and the tip 2 of the pen 1 is placed inside the barrel. In addition to the tip electrode part 20 that contacts with, the pen body electrode part 33 that contacts the pen body 5 of the pen 1 is provided. Further, a switch 34 that is turned on when the pen 1 is inserted inside the cylinder is also provided inside the cylinder.

(D) Fabrication of power supply device: FIG. 6 is a circuit diagram of the power supply device shown in FIG. In this embodiment, the power supply device 61 is configured as shown in the circuit diagram within the dotted line in FIG. The difference from the circuit diagram of the power supply device of the first embodiment is that the switch is not provided in the circuit of the power supply device 61 of the present embodiment, and the switch 34 is attached in the charging device 62 instead. Therefore, except that the pen 1 is inserted into the charging device 62 and the switch 34 is turned on, the power supply device 61 according to the present embodiment.
The operation of is similar to that of the first embodiment.

(E) Preparation of handwritten liquid crystal board set: As shown in FIGS. 4 and 6, the liquid crystal board 10 is not electrically connected to other devices in this embodiment. That is,
One output terminal 22 of the power supply device 61 is connected to the pen body electrode part in the charging device 62 via the lead wire 32, and
The other output terminal 21 of the power supply device 61 was connected to the chip electrode portion in the charging device 62 via the lead wire 30. further,
The switch 34 in the charging device 62 was connected to the power supply device 61 to produce a handwritten liquid crystal board set. It should be noted that one output terminal 22 of the power supply device 61 may be connected to the conductive layer 28 of the liquid crystal board 10 via a conductive wire.

(D) Writing operation: First, as shown in FIG. 4, while holding the pen body 5 with one hand, the pen 1 is charged by the charging device 6.
Insert the tip 2 of the pen 1 into the charging device 62
The insertion was continued until it contacted the chip electrode portion 20 therein.
Then, by inserting the pen 1, the switch 34 is turned on, the pen body 5 contacts the pen body electrode portion 33, and charging is started. In the present embodiment, unlike the first embodiment, the chip electrode portion 20 that contacts the chip 2 in the charging device 62.
Since the pen body electrode portion 33 that comes into contact with the pen body 5 is provided, charging is performed without touching the conductive member 13 of the liquid crystal board 10 with the other hand. After the charging of the pen 1 is completed, bring the pen 1 onto the liquid crystal board 10, hold the pen body 5 with one hand, and use the pen 1 to display the board screen 1
I wrote it in 4. However, while writing with the pen 1, the other hand continued to touch the conductive member 13 of the liquid crystal board 10. Therefore, a surface potential was generated in the written portion of the board screen 14, and the liquid crystal 26 of the liquid crystal dispersed polymer layer 24 was oriented by the electrostatic field, and as a result, a recorded image was obtained.

(G) Erasing operation: As in Example 1, the erasing member 17 was held by one hand while the conductive member 13 of the liquid crystal board 10 was touched by the other hand. In this state, the erasing member 1
When the recorded image is traced by 7, the conductive layer 28 and the erasing member 17 are electrically at the same potential, the electrostatic field applied between the surface of the liquid crystal board 10 and the conductive layer 28 is neutralized and removed, and the liquid crystal The orientation of the liquid crystal molecules 26 in the dispersed polymer layer 24 disappeared, and only an arbitrary portion of the recorded image could be easily erased.

Example 3 The same as Example 1 except that a timer circuit that cuts off the output after about 5 minutes was assembled between a 1.5 volt AA battery and a power source 11 and an automatic power-off mechanism was provided. I made a handwritten LCD board set. In the board set of the present embodiment, even if the handwritten liquid crystal board set is left with the power switch kept on, the switch is automatically cut off after a certain period of time so that electricity is not wasted. In this way, a power-saving handwritten liquid crystal board set that not only can be repeatedly displayed and erased easily but also has no risk of electric shock in any use situation was obtained.

[0069]

According to the rechargeable pen for a liquid crystal board of the present invention, the storage means for accumulating electric charges is provided inside the pen, so that the pen and the power supply device can be electrically connected to each other when writing on the liquid crystal board. Therefore, it is possible to easily write a recorded image by handwriting from the outside of the liquid crystal board without requiring any complicated operation.

Further, according to the handwritten liquid crystal board set of the present invention, by including the above rechargeable pen and the charging device for the pen, by writing on the board screen of the liquid crystal board with the pen charged by the charging device, Since a recorded image can be displayed by applying an electrostatic charge to the liquid crystal dispersion polymer layer of the liquid crystal board, it is possible to immerse the pen in the ink fountain and write with the touch pen feel like writing on paper.

Further, according to the handwritten liquid crystal board set of the present invention, the insertion of the pen is detected in the charging device, and the power supply is turned off.
By providing a means for performing N / OFF, power consumption can be reduced. Further, by providing the positive electrode and the negative electrode for charging the pen in the charging device, the charging operation can be performed only by inserting the pen into the charging device, and the charging operation is simplified and the charge is reduced. The power supply device for supply and the liquid crystal board can be electrically separated.

Finally, when writing and erasing, application and removal of electric charges, that is, electric operation is performed. However, the above-mentioned configuration ensures a safe handwritten liquid crystal board set which does not cause electric shock to the human body. Can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a rechargeable pen for a liquid crystal board according to the present invention.

FIG. 2 is a schematic perspective view of a handwritten liquid crystal board set according to the present invention.

FIG. 3 is a schematic configuration diagram showing an embodiment of a handwritten liquid crystal board set according to the present invention.

FIG. 4 is a schematic configuration diagram showing another embodiment of the handwritten liquid crystal board set according to the present invention.

5 is a circuit diagram of the power supply device of FIG.

FIG. 6 is a circuit diagram of the power supply device of FIG.

[Explanation of symbols]

 1 Rechargeable pen for LCD board 2 Chip 3 Connector 4 Capacitor 5 Pen body 6 Resistance

Claims (8)

[Claims] 1. A tip made of a conductive material for writing a recorded image on a board screen of a liquid crystal board, a pen main body made of a conductive material that is gripped by hand during writing, the tip and the pen main body. A rechargeable pen for a liquid crystal board, comprising: a connector made of an insulating material for connecting to each other, wherein the chip and the pen body are connected to each other by a storage means for accumulating charges inside the pen. Characteristic rechargeable pen for LCD board. 2. The rechargeable pen for a liquid crystal board according to claim 1, wherein the power storage means and the pen body are connected by a resistor that regulates an output current value from the pen body to 5 mA or less. . 3. A conductive layer (A), a transparent electric resistance layer having a volume resistivity of 10 ¹³ Ω · cm or more at a temperature of 20 ° C. and a relative humidity of 90%, and a liquid crystal finely dispersed in a polymer matrix, and volume resistivity at 90% relative humidity during at temperature 20 ° C. is 10 ¹³ Omega · a liquid crystal-dispersed polymer layer cm or more, the temperature 20 ° C. in a volume resistivity at 90% relative humidity at the 10 ¹³ Omega · cm or more An externally chargeable liquid crystal board mainly composed of a liquid crystal sheet in which a transparent insulating layer which is a layer is sequentially laminated, and a conductive member electrically connected to the conductive layer, and (B) a board of the liquid crystal board. A tip made of a conductive material for writing a recorded image on a screen, a pen body made of a conductive material that is gripped by hand during writing, and an insulating material for connecting the tip and the pen body Equipped with A rechargeable pen for a liquid crystal board, comprising: (C) a rechargeable pen for a liquid crystal board, wherein the chip and the pen body are connected to each other by a storage means for accumulating an electric charge inside the pen. For a chip in which the erasing member made of a conductive material for erasing the recorded image written on the board screen by the mold pen and (D) the charging pen for the liquid crystal board is inserted, the chip of the pen comes into contact A charging device having an electrode part, and (E)
A handwritten liquid crystal board comprising a power supply device having an output terminal connected to a chip electrode portion of the charging device and another output terminal connected to a conductive layer of the liquid crystal board. set. 4. The handwritten liquid crystal according to claim 3, wherein the power storage means of the liquid crystal board pen and the pen body are connected by a resistor that limits an output current value from the pen body to 5 mA or less. Board set. 5. The blocking oscillator comprising a DC low-voltage power supply, a power switch, an oscillation transistor for boosting a low voltage generated from the DC low-voltage power supply, and a boosting oscillation transformer. A circuit, a rectifying diode for rectifying the voltage generated by the blocking oscillator circuit, a smoothing capacitor for charging the rectified voltage and smoothing an output voltage, a smoothing capacitor and an output terminal The handwritten liquid crystal board set according to claim 3, wherein the handwritten liquid crystal board set has a resistor connected between the two and a resistor that regulates an output current value to 5 mA or less. 6. (A) a conductive layer, a transparent electric resistance layer having a volume resistivity of 10 ¹³ Ω · cm or more at a temperature of 20 ° C. and a relative humidity of 90%, and a liquid crystal finely dispersed in a polymer matrix, and volume resistivity at 90% relative humidity during at temperature 20 ° C. is 10 ¹³ Omega · a liquid crystal-dispersed polymer layer cm or more, the temperature 20 ° C. in a volume resistivity at 90% relative humidity at the 10 ¹³ Omega · cm or more An externally chargeable liquid crystal board mainly composed of a liquid crystal sheet in which a transparent insulating layer which is a layer is sequentially laminated, and a conductive member electrically connected to the conductive layer, and (B) a board of the liquid crystal board. A tip made of a conductive material for writing a recorded image on a screen, a pen body made of a conductive material that is gripped by hand during writing, and an insulating material for connecting the tip and the pen body Equipped with A rechargeable pen for a liquid crystal board, comprising: (C) a rechargeable pen for a liquid crystal board, wherein the chip and the pen body are connected to each other by a storage means for accumulating an electric charge inside the pen. For a chip in which the erasing member made of a conductive material for erasing the recorded image written on the board screen by the mold pen and (D) the charging pen for the liquid crystal board is inserted, the chip of the pen comes into contact A charging device comprising: a pen body electrode portion in contact with the electrode portion and the pen body; and a switch that is turned on when the pen is inserted into the cylinder.
(E) An output terminal connected to the tip electrode part of the charging device and another output terminal connected to the pen body electrode part of the charging device, and further provided inside the charging device. A handwritten liquid crystal board set comprising: a power supply device connected to the switch. 7. The handwritten liquid crystal according to claim 6, wherein the storage means of the liquid crystal board pen and the pen body are connected by a resistor that regulates the output current value from the pen body to 5 mA or less. Board set. 8. A blocking oscillator circuit comprising a direct current low voltage power source, an oscillating transistor for boosting a low voltage generated from the direct current low voltage power source, and a boosting oscillating transformer, A rectifying diode for rectifying the voltage generated by the blocking oscillator circuit,
It has a smoothing capacitor for charging the rectified voltage and smoothing the output voltage, and a resistor connected between the smoothing capacitor and the output terminal and regulating the output current value to 5 mA or less. 7. The handwritten liquid crystal board set according to claim 6.